{"id":38015,"date":"2025-05-19T14:13:33","date_gmt":"2025-05-19T06:13:33","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/38015.html"},"modified":"2025-05-19T14:13:33","modified_gmt":"2025-05-19T06:13:33","slug":"%e5%9f%ba%e4%ba%8eopencv%e7%9a%84%e5%ae%9e%e6%97%b6%e6%96%87%e6%a1%a3%e6%89%ab%e6%8f%8f%e4%b8%8e%e7%9f%ab%e6%ad%a3%e6%8a%80%e6%9c%af","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/38015.html","title":{"rendered":"\u57fa\u4e8eOpenCV\u7684\u5b9e\u65f6\u6587\u6863\u626b\u63cf\u4e0e\u77eb\u6b63\u6280\u672f"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\n<ul>\n<li>\u5f15\u8a00<\/li>\n<li>\u4e00\u3001\u7cfb\u7edf\u6982\u8ff0<\/li>\n<li>\u4e8c\u3001\u6838\u5fc3\u4ee3\u7801\u89e3\u6790<\/li>\n<li>\n<ul>\n<li>1. \u5bfc\u5165\u5fc5\u8981\u5e93<\/li>\n<li>2. \u8f85\u52a9\u51fd\u6570\u5b9a\u4e49<\/li>\n<li>3. \u5750\u6807\u70b9\u6392\u5e8f\u51fd\u6570<\/li>\n<li>4. \u900f\u89c6\u53d8\u6362\u51fd\u6570<\/li>\n<li>5. \u4e3b\u7a0b\u5e8f\u6d41\u7a0b<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001\u5b8c\u6574\u4ee3\u7801<\/li>\n<li>\u56db\u3001\u7ed3\u8bed<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u5f15\u8a00<\/h3>\n<p>\u5728\u65e5\u5e38\u5de5\u4f5c\u548c\u5b66\u4e60\u4e2d&#xff0c;\u6211\u4eec\u7ecf\u5e38\u9700\u8981\u5c06\u7eb8\u8d28\u6587\u6863\u6570\u5b57\u5316\u3002\u624b\u52a8\u62cd\u6444\u6587\u6863\u7167\u7247\u5e38\u5e38\u4f1a\u51fa\u73b0\u89d2\u5ea6\u503e\u659c\u3001\u900f\u89c6\u53d8\u5f62\u7b49\u95ee\u9898&#xff0c;\u5f71\u54cd\u540e\u7eed\u4f7f\u7528\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528Python\u548cOpenCV\u6784\u5efa\u4e00\u4e2a\u5b9e\u65f6\u6587\u6863\u626b\u63cf\u4e0e\u77eb\u6b63\u7cfb\u7edf&#xff0c;\u80fd\u591f\u901a\u8fc7\u6444\u50cf\u5934\u81ea\u52a8\u68c0\u6d4b\u6587\u6863\u8fb9\u7f18\u5e76\u8fdb\u884c\u900f\u89c6\u53d8\u6362\u77eb\u6b63\u3002<\/p>\n<h3>\u4e00\u3001\u7cfb\u7edf\u6982\u8ff0<\/h3>\n<p>\u8be5\u7cfb\u7edf\u4e3b\u8981\u5b9e\u73b0\u4ee5\u4e0b\u529f\u80fd&#xff1a;<\/p>\n<li>\u5b9e\u65f6\u6444\u50cf\u5934\u6355\u83b7\u56fe\u50cf<\/li>\n<li>\u8fb9\u7f18\u68c0\u6d4b\u548c\u8f6e\u5ed3\u67e5\u627e<\/li>\n<li>\u6587\u6863\u8f6e\u5ed3\u8bc6\u522b<\/li>\n<li>\u900f\u89c6\u53d8\u6362\u77eb\u6b63\u6587\u6863<\/li>\n<li>\u4e8c\u503c\u5316\u5904\u7406\u589e\u5f3a\u53ef\u8bfb\u6027<\/li>\n<h3>\u4e8c\u3001\u6838\u5fc3\u4ee3\u7801\u89e3\u6790<\/h3>\n<h4>1. \u5bfc\u5165\u5fc5\u8981\u5e93<\/h4>\n<p><span class=\"token keyword\">import<\/span> numpy <span class=\"token keyword\">as<\/span> np<br \/>\n<span class=\"token keyword\">import<\/span> cv2<\/p>\n<p>\u6211\u4eec\u4e3b\u8981\u4f7f\u7528NumPy\u8fdb\u884c\u6570\u503c\u8ba1\u7b97&#xff0c;OpenCV\u8fdb\u884c\u56fe\u50cf\u5904\u7406\u3002<\/p>\n<h4>2. \u8f85\u52a9\u51fd\u6570\u5b9a\u4e49<\/h4>\n<p>\u9996\u5148\u5b9a\u4e49\u4e86\u4e00\u4e2a\u7b80\u5355\u7684\u56fe\u50cf\u663e\u793a\u51fd\u6570&#xff0c;\u65b9\u4fbf\u8c03\u8bd5&#xff1a;<\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">cv_show<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">,<\/span>img<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    cv2<span class=\"token punctuation\">.<\/span>imshow<span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">,<\/span>img<span class=\"token punctuation\">)<\/span><br \/>\n    cv2<span class=\"token punctuation\">.<\/span>waitKey<span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<h4>3. \u5750\u6807\u70b9\u6392\u5e8f\u51fd\u6570<\/h4>\n<p>order_points\u51fd\u6570\u7528\u4e8e\u5c06\u68c0\u6d4b\u5230\u7684\u6587\u6863\u56db\u4e2a\u89d2\u70b9\u6309\u987a\u5e8f\u6392\u5217&#xff08;\u5de6\u4e0a\u3001\u53f3\u4e0a\u3001\u53f3\u4e0b\u3001\u5de6\u4e0b&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">order_points<\/span><span class=\"token punctuation\">(<\/span>pts<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    rect <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>zeros<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>dtype<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;float32&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    s <span class=\"token operator\">&#061;<\/span> pts<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">sum<\/span><span class=\"token punctuation\">(<\/span>axis<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    rect<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> pts<span class=\"token punctuation\">[<\/span>np<span class=\"token punctuation\">.<\/span>argmin<span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># \u5de6\u4e0a\u70b9(x&#043;y\u6700\u5c0f)<\/span><br \/>\n    rect<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> pts<span class=\"token punctuation\">[<\/span>np<span class=\"token punctuation\">.<\/span>argmax<span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># \u53f3\u4e0b\u70b9(x&#043;y\u6700\u5927)<\/span><br \/>\n    diff <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>diff<span class=\"token punctuation\">(<\/span>pts<span class=\"token punctuation\">,<\/span>axis<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    rect<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> pts<span class=\"token punctuation\">[<\/span>np<span class=\"token punctuation\">.<\/span>argmin<span class=\"token punctuation\">(<\/span>diff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># \u53f3\u4e0a\u70b9(y-x\u6700\u5c0f)<\/span><br \/>\n    rect<span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> pts<span class=\"token punctuation\">[<\/span>np<span class=\"token punctuation\">.<\/span>argmax<span class=\"token punctuation\">(<\/span>diff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># \u5de6\u4e0b\u70b9(y-x\u6700\u5927)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> rect<\/p>\n<p>\u8fd9\u4e2a\u51fd\u6570\u7684\u4f5c\u7528\u662f\u5bf9\u7ed9\u5b9a\u76844\u4e2a\u4e8c\u7ef4\u5750\u6807\u70b9\u8fdb\u884c\u6392\u5e8f&#xff0c;\u4f7f\u5176\u6309\u7167\u5de6\u4e0a\u3001\u53f3\u4e0a\u3001\u53f3\u4e0b\u3001\u5de6\u4e0b\u7684\u987a\u5e8f\u6392\u5217\u3002\u8fd9\u5728\u6587\u6863\u626b\u63cf\u3001\u56fe\u50cf\u77eb\u6b63\u7b49\u5e94\u7528\u4e2d\u975e\u5e38\u91cd\u8981&#xff0c;\u56e0\u4e3a\u6211\u4eec\u9700\u8981\u77e5\u9053\u6bcf\u4e2a\u89d2\u70b9\u7684\u786e\u5207\u4f4d\u7f6e\u624d\u80fd\u6b63\u786e\u5730\u8fdb\u884c\u900f\u89c6\u53d8\u6362\u3002<\/p>\n<p>\u51fd\u6570\u8be6\u7ec6\u89e3\u6790<\/p>\n<p>&#xff08;1&#xff09;\u6392\u5e8f\u903b\u8f91\u8bf4\u660e<\/p>\n<li>\n<p>\u5de6\u4e0a\u70b9(rect[0])&#xff1a;\u9009\u62e9x&#043;y\u503c\u6700\u5c0f\u7684\u70b9<\/p>\n<ul>\n<li>\u56e0\u4e3a\u5de6\u4e0a\u89d2\u5728\u5750\u6807\u7cfb\u4e2d x \u548c y \u503c\u90fd\u8f83\u5c0f&#xff0c;\u76f8\u52a0\u7ed3\u679c\u6700\u5c0f<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u53f3\u4e0b\u70b9(rect[2])&#xff1a;\u9009\u62e9x&#043;y\u503c\u6700\u5927\u7684\u70b9<\/p>\n<ul>\n<li>\u56e0\u4e3a\u53f3\u4e0b\u89d2\u5728\u5750\u6807\u7cfb\u4e2d x \u548c y \u503c\u90fd\u8f83\u5927&#xff0c;\u76f8\u52a0\u7ed3\u679c\u6700\u5927<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u53f3\u4e0a\u70b9(rect[1])&#xff1a;\u9009\u62e9y-x\u503c\u6700\u5c0f\u7684\u70b9<\/p>\n<ul>\n<li>\u53f3\u4e0a\u89d2\u7684\u7279\u70b9\u662f y \u76f8\u5bf9\u8f83\u5c0f\u800c x \u76f8\u5bf9\u8f83\u5927&#xff0c;\u6240\u4ee5 y-x \u503c\u6700\u5c0f<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5de6\u4e0b\u70b9(rect[3])&#xff1a;\u9009\u62e9y-x\u503c\u6700\u5927\u7684\u70b9<\/p>\n<ul>\n<li>\u5de6\u4e0b\u89d2\u7684\u7279\u70b9\u662f y \u76f8\u5bf9\u8f83\u5927\u800c x \u76f8\u5bf9\u8f83\u5c0f&#xff0c;\u6240\u4ee5 y-x \u503c\u6700\u5927<\/li>\n<\/ul>\n<\/li>\n<p>&#xff08;2&#xff09;\u793a\u4f8b<\/p>\n<p>\u5047\u8bbe\u67094\u4e2a\u70b9&#xff1a;<\/p>\n<p>A<span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u5047\u8bbe\u662f\u5de6\u4e0a<\/span><br \/>\nB<span class=\"token punctuation\">(<\/span><span class=\"token number\">50<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u53f3\u4e0a<\/span><br \/>\nC<span class=\"token punctuation\">(<\/span><span class=\"token number\">50<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">60<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u53f3\u4e0b<\/span><br \/>\nD<span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">60<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u5de6\u4e0b<\/span><\/p>\n<p>\u8ba1\u7b97\u8fc7\u7a0b&#xff1a;<\/p>\n<li>\n<p>x&#043;y\u503c&#xff1a;[30, 70, 110, 70]<\/p>\n<ul>\n<li>\u6700\u5c0f30 \u2192 A(\u5de6\u4e0a)<\/li>\n<li>\u6700\u5927110 \u2192 C(\u53f3\u4e0b)<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>y-x\u503c&#xff1a;[10, -30, 10, 50]<\/p>\n<ul>\n<li>\u6700\u5c0f-30 \u2192 B(\u53f3\u4e0a)<\/li>\n<li>\u6700\u592750 \u2192 D(\u5de6\u4e0b)<\/li>\n<\/ul>\n<\/li>\n<p>\u6700\u7ec8\u6392\u5e8f\u7ed3\u679c&#xff1a;[A, B, C, D] \u5373 [\u5de6\u4e0a, \u53f3\u4e0a, \u53f3\u4e0b, \u5de6\u4e0b]<\/p>\n<p>&#xff08;3&#xff09;\u4e3a\u4ec0\u4e48\u8fd9\u79cd\u65b9\u6cd5\u6709\u6548<\/p>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u5229\u7528\u4e86\u4e8c\u7ef4\u5750\u6807\u70b9\u7684\u51e0\u4f55\u7279\u6027&#xff1a;<\/p>\n<ul>\n<li>\u5728\u6807\u51c6\u5750\u6807\u7cfb\u4e2d&#xff0c;\u5de6\u4e0a\u89d2\u7684x\u548cy\u503c\u90fd\u8f83\u5c0f<\/li>\n<li>\u53f3\u4e0b\u89d2\u7684x\u548cy\u503c\u90fd\u8f83\u5927<\/li>\n<li>\u53f3\u4e0a\u89d2\u7684x\u8f83\u5927\u800cy\u8f83\u5c0f<\/li>\n<li>\u5de6\u4e0b\u89d2\u7684x\u8f83\u5c0f\u800cy\u8f83\u5927<\/li>\n<\/ul>\n<p>\u901a\u8fc7\u7b80\u5355\u7684\u52a0\u51cf\u8fd0\u7b97\u5c31\u80fd\u53ef\u9760\u5730\u533a\u5206\u51fa\u5404\u4e2a\u89d2\u70b9&#xff0c;\u4e0d\u9700\u8981\u590d\u6742\u7684\u51e0\u4f55\u8ba1\u7b97\u3002<\/p>\n<h4>4. \u900f\u89c6\u53d8\u6362\u51fd\u6570<\/h4>\n<p>four_point_transform\u51fd\u6570\u5b9e\u73b0\u4e86\u6587\u6863\u77eb\u6b63\u7684\u6838\u5fc3\u529f\u80fd&#xff1a;<\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">four_point_transform<\/span><span class=\"token punctuation\">(<\/span>image<span class=\"token punctuation\">,<\/span>pts<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    rect <span class=\"token operator\">&#061;<\/span> order_points<span class=\"token punctuation\">(<\/span>pts<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">(<\/span>tl<span class=\"token punctuation\">,<\/span>tr<span class=\"token punctuation\">,<\/span>br<span class=\"token punctuation\">,<\/span>bl<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> rect<\/p>\n<p>    <span class=\"token comment\"># \u8ba1\u7b97\u53d8\u6362\u540e\u7684\u5bbd\u5ea6\u548c\u9ad8\u5ea6<\/span><br \/>\n    widthA <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>sqrt<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>br<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> bl<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>br<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> bl<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    widthB <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>sqrt<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tr<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> tl<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tr<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> tl<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    maxWidth <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">max<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">(<\/span>widthA<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">(<\/span>widthB<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    heightA <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>sqrt<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tr<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> br<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tr<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> br<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    heightB <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>sqrt<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tl<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> bl<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tl<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> bl<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    maxHeight <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">max<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">(<\/span>heightA<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">(<\/span>heightB<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\"># \u5b9a\u4e49\u76ee\u6807\u56fe\u50cf\u5750\u6807<\/span><br \/>\n    dst <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>array<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">[<\/span>maxWidth <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                    <span class=\"token punctuation\">[<\/span>maxWidth <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span>maxHeight <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>maxHeight <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>dtype<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;float32&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\"># \u8ba1\u7b97\u900f\u89c6\u53d8\u6362\u77e9\u9635\u5e76\u5e94\u7528<\/span><br \/>\n    M <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>getPerspectiveTransform<span class=\"token punctuation\">(<\/span>rect<span class=\"token punctuation\">,<\/span>dst<span class=\"token punctuation\">)<\/span><br \/>\n    warped <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>warpPerspective<span class=\"token punctuation\">(<\/span>image<span class=\"token punctuation\">,<\/span>M<span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span>maxWidth<span class=\"token punctuation\">,<\/span>maxHeight<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> warped<\/p>\n<p>\u8fd9\u4e2a\u51fd\u6570\u5b9e\u73b0\u4e86\u900f\u89c6\u53d8\u6362(Perspective Transformation)&#xff0c;\u7528\u4e8e\u5c06\u56fe\u50cf\u4e2d\u7684\u4efb\u610f\u56db\u8fb9\u5f62\u533a\u57df\u77eb\u6b63\u4e3a\u4e00\u4e2a\u77e9\u5f62&#xff08;\u5373&#034;\u53bb\u900f\u89c6&#034;\u6548\u679c&#xff09;\u3002<\/p>\n<p>\u51fd\u6570\u8be6\u7ec6\u89e3\u6790<\/p>\n<li>\u8f93\u5165\u53c2\u6570<\/li>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">four_point_transform<\/span><span class=\"token punctuation\">(<\/span>image<span class=\"token punctuation\">,<\/span> pts<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><\/p>\n<ul>\n<li>image: \u539f\u59cb\u56fe\u50cf<\/li>\n<li>pts: \u5305\u542b4\u4e2a\u70b9\u7684\u6570\u7ec4&#xff0c;\u8868\u793a\u8981\u8f6c\u6362\u7684\u56db\u8fb9\u5f62\u533a\u57df<\/li>\n<\/ul>\n<li>\u5750\u6807\u70b9\u6392\u5e8f<\/li>\n<p>rect <span class=\"token operator\">&#061;<\/span> order_points<span class=\"token punctuation\">(<\/span>pts<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">(<\/span>tl<span class=\"token punctuation\">,<\/span> tr<span class=\"token punctuation\">,<\/span> br<span class=\"token punctuation\">,<\/span> bl<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> rect  <span class=\"token comment\"># \u5206\u89e3\u4e3a\u5de6\u4e0a(top-left)\u3001\u53f3\u4e0a(top-right)\u3001\u53f3\u4e0b(bottom-right)\u3001\u5de6\u4e0b(bottom-left)<\/span><\/p>\n<p>\u4f7f\u7528\u4e4b\u524d\u4ecb\u7ecd\u7684order_points\u51fd\u6570\u5c064\u4e2a\u70b9\u6309\u987a\u5e8f\u6392\u5217<\/p>\n<li>\u8ba1\u7b97\u8f93\u51fa\u56fe\u50cf\u7684\u5bbd\u5ea6<\/li>\n<p>widthA <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>sqrt<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>br<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> bl<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>br<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> bl<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u5e95\u8fb9\u957f\u5ea6<\/span><br \/>\nwidthB <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>sqrt<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tr<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> tl<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tr<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> tl<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u9876\u8fb9\u957f\u5ea6<\/span><br \/>\nmaxWidth <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">max<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">(<\/span>widthA<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">(<\/span>widthB<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u53d6\u6700\u5927\u503c\u4f5c\u4e3a\u8f93\u51fa\u56fe\u50cf\u5bbd\u5ea6<\/span><\/p>\n<p>\u8ba1\u7b97\u56db\u8fb9\u5f62\u5e95\u90e8\u548c\u9876\u90e8\u7684\u8fb9\u957f&#xff0c;\u9009\u62e9\u8f83\u957f\u7684\u4f5c\u4e3a\u8f93\u51fa\u5bbd\u5ea6<\/p>\n<li>\u8ba1\u7b97\u8f93\u51fa\u56fe\u50cf\u7684\u9ad8\u5ea6<\/li>\n<p>heightA <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>sqrt<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tr<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> br<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tr<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> br<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u53f3\u8fb9\u9ad8\u5ea6<\/span><br \/>\nheightB <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>sqrt<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tl<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> bl<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tl<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> bl<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u5de6\u8fb9\u9ad8\u5ea6<\/span><br \/>\nmaxHeight <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">max<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">(<\/span>heightA<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token builtin\">int<\/span><span class=\"token punctuation\">(<\/span>heightB<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u53d6\u6700\u5927\u503c\u4f5c\u4e3a\u8f93\u51fa\u56fe\u50cf\u9ad8\u5ea6<\/span><\/p>\n<p>\u8ba1\u7b97\u56db\u8fb9\u5f62\u53f3\u4fa7\u548c\u5de6\u4fa7\u7684\u8fb9\u957f&#xff0c;\u9009\u62e9\u8f83\u957f\u7684\u4f5c\u4e3a\u8f93\u51fa\u9ad8\u5ea6<\/p>\n<li>\u5b9a\u4e49\u76ee\u6807\u77e9\u5f62\u5750\u6807<\/li>\n<p>dst <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>array<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><br \/>\n    <span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token comment\"># \u5de6\u4e0a<\/span><br \/>\n    <span class=\"token punctuation\">[<\/span>maxWidth <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token comment\"># \u53f3\u4e0a<\/span><br \/>\n    <span class=\"token punctuation\">[<\/span>maxWidth <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> maxHeight <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token comment\"># \u53f3\u4e0b<\/span><br \/>\n    <span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> maxHeight <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># \u5de6\u4e0b<\/span><br \/>\n<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> dtype<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;float32&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5b9a\u4e49\u53d8\u6362\u540e\u7684\u77e9\u5f62\u89d2\u70b9\u5750\u6807&#xff08;\u4ece(0,0)\u5f00\u59cb\u7684\u6b63\u77e9\u5f62&#xff09;<\/p>\n<li>\u8ba1\u7b97\u900f\u89c6\u53d8\u6362\u77e9\u9635\u5e76\u5e94\u7528<\/li>\n<p>M <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>getPerspectiveTransform<span class=\"token punctuation\">(<\/span>rect<span class=\"token punctuation\">,<\/span> dst<span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u8ba1\u7b97\u53d8\u6362\u77e9\u9635<\/span><br \/>\nwarped <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>warpPerspective<span class=\"token punctuation\">(<\/span>image<span class=\"token punctuation\">,<\/span> M<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>maxWidth<span class=\"token punctuation\">,<\/span> maxHeight<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u5e94\u7528\u53d8\u6362<\/span><\/p>\n<ul>\n<li>getPerspectiveTransform: \u8ba1\u7b97\u4ece\u539f\u59cb\u56db\u8fb9\u5f62\u5230\u76ee\u6807\u77e9\u5f62\u76843&#215;3\u53d8\u6362\u77e9\u9635<\/li>\n<li>warpPerspective: \u5e94\u7528\u8fd9\u4e2a\u53d8\u6362\u77e9\u9635\u5230\u539f\u59cb\u56fe\u50cf<\/li>\n<\/ul>\n<li>\u8fd4\u56de\u7ed3\u679c<\/li>\n<p><span class=\"token keyword\">return<\/span> warped<\/p>\n<p>\u8fd4\u56de\u77eb\u6b63\u540e\u7684\u77e9\u5f62\u56fe\u50cf<\/p>\n<li>\u900f\u89c6\u53d8\u6362\u539f\u7406\u56fe\u793a<\/li>\n<p>\u539f\u59cb\u56fe\u50cf\u4e2d\u7684\u56db\u8fb9\u5f62               \u53d8\u6362\u540e\u7684\u77e9\u5f62<br \/>\n   tl<span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span>tr                    <span class=\"token number\">0<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span>maxWidth<br \/>\n    \\\\        <span class=\"token operator\">\/<\/span>                      <span class=\"token operator\">|<\/span>        <span class=\"token operator\">|<\/span><br \/>\n     \\\\      <span class=\"token operator\">\/<\/span>                       <span class=\"token operator\">|<\/span>        <span class=\"token operator\">|<\/span><br \/>\n      bl<span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&#8211;<\/span>br                       maxHeight<\/p>\n<li>\u4e3a\u4ec0\u4e48\u9700\u8981\u8fd9\u6837\u8ba1\u7b97\u5bbd\u5ea6\u548c\u9ad8\u5ea6&#xff1f;<\/li>\n<p>\u53d6\u6700\u5927\u503c\u7684\u539f\u56e0&#xff1a;<\/p>\n<ul>\n<li>\u539f\u59cb\u56db\u8fb9\u5f62\u53ef\u80fd\u6709\u900f\u89c6\u53d8\u5f62&#xff0c;\u4e24\u6761\u5bf9\u8fb9\u957f\u5ea6\u53ef\u80fd\u4e0d\u7b49<\/li>\n<li>\u9009\u62e9\u8f83\u5927\u7684\u503c\u53ef\u4ee5\u786e\u4fdd\u6240\u6709\u5185\u5bb9\u90fd\u80fd\u5305\u542b\u5728\u8f93\u51fa\u56fe\u50cf\u4e2d<\/li>\n<\/ul>\n<p>\u51cf1\u7684\u539f\u56e0&#xff1a;<\/p>\n<ul>\n<li>\u56fe\u50cf\u5750\u6807\u4ece0\u5f00\u59cb&#xff0c;\u6240\u4ee5\u5bbd\u5ea6\u4e3amaxWidth\u7684\u56fe\u50cf&#xff0c;\u6700\u5927x\u5750\u6807\u662fmaxWidth-1<\/li>\n<\/ul>\n<h4>5. \u4e3b\u7a0b\u5e8f\u6d41\u7a0b<\/h4>\n<p>\u4e3b\u7a0b\u5e8f\u5b9e\u73b0\u4e86\u5b9e\u65f6\u6587\u6863\u68c0\u6d4b\u548c\u77eb\u6b63\u7684\u5b8c\u6574\u6d41\u7a0b&#xff1a;<\/p>\n<li>\u521d\u59cb\u5316\u6444\u50cf\u5934<\/li>\n<p>cap <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>VideoCapture<span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token keyword\">not<\/span> cap<span class=\"token punctuation\">.<\/span>isOpened<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Cannot open camera&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    exit<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<li>\u5b9e\u65f6\u5904\u7406\u5faa\u73af<\/li>\n<p><span class=\"token keyword\">while<\/span> <span class=\"token boolean\">True<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    flag <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><br \/>\n    ret<span class=\"token punctuation\">,<\/span>image <span class=\"token operator\">&#061;<\/span> cap<span class=\"token punctuation\">.<\/span>read<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    orig <span class=\"token operator\">&#061;<\/span> image<span class=\"token punctuation\">.<\/span>copy<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token keyword\">not<\/span> ret<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4e0d\u80fd\u8bfb\u53d6\u6444\u50cf\u5934&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><\/p>\n<li>\u56fe\u50cf\u9884\u5904\u7406<\/li>\n<p>gray <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>cvtColor<span class=\"token punctuation\">(<\/span>image<span class=\"token punctuation\">,<\/span>cv2<span class=\"token punctuation\">.<\/span>COLOR_BGR2GRAY<span class=\"token punctuation\">)<\/span><br \/>\ngray <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>GaussianBlur<span class=\"token punctuation\">(<\/span>gray<span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u9ad8\u65af\u6ee4\u6ce2\u964d\u566a<\/span><br \/>\nedged <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>Canny<span class=\"token punctuation\">(<\/span>gray<span class=\"token punctuation\">,<\/span><span class=\"token number\">75<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">200<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># Canny\u8fb9\u7f18\u68c0\u6d4b<\/span><\/p>\n<li>\u8f6e\u5ed3\u68c0\u6d4b\u4e0e\u7b5b\u9009<\/li>\n<p>cnts <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>findContours<span class=\"token punctuation\">(<\/span>edged<span class=\"token punctuation\">,<\/span>cv2<span class=\"token punctuation\">.<\/span>RETR_EXTERNAL<span class=\"token punctuation\">,<\/span>cv2<span class=\"token punctuation\">.<\/span>CHAIN_APPROX_SIMPLE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><br \/>\ncnts <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">sorted<\/span><span class=\"token punctuation\">(<\/span>cnts<span class=\"token punctuation\">,<\/span>key<span class=\"token operator\">&#061;<\/span>cv2<span class=\"token punctuation\">.<\/span>contourArea<span class=\"token punctuation\">,<\/span>reverse<span class=\"token operator\">&#061;<\/span><span class=\"token boolean\">True<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># \u53d6\u9762\u79ef\u6700\u5927\u76843\u4e2a\u8f6e\u5ed3<\/span><\/p>\n<p><span class=\"token keyword\">for<\/span> c <span class=\"token keyword\">in<\/span> cnts<span class=\"token punctuation\">:<\/span><br \/>\n    peri <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>arcLength<span class=\"token punctuation\">(<\/span>c<span class=\"token punctuation\">,<\/span><span class=\"token boolean\">True<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u8ba1\u7b97\u8f6e\u5ed3\u5468\u957f<\/span><br \/>\n    approx <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>approxPolyDP<span class=\"token punctuation\">(<\/span>c<span class=\"token punctuation\">,<\/span><span class=\"token number\">0.05<\/span> <span class=\"token operator\">*<\/span> peri<span class=\"token punctuation\">,<\/span><span class=\"token boolean\">True<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u591a\u8fb9\u5f62\u8fd1\u4f3c<\/span><br \/>\n    area <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>contourArea<span class=\"token punctuation\">(<\/span>approx<span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\"># \u7b5b\u9009\u56db\u8fb9\u5f62\u4e14\u9762\u79ef\u8db3\u591f\u5927\u7684\u8f6e\u5ed3<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> area <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">20000<\/span> <span class=\"token keyword\">and<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>approx<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        screenCnt <span class=\"token operator\">&#061;<\/span> approx<br \/>\n        flag <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><\/p>\n<li>\u6587\u6863\u77eb\u6b63\u4e0e\u663e\u793a<\/li>\n<p><span class=\"token keyword\">if<\/span> flag <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token comment\"># \u7ed8\u5236\u8f6e\u5ed3<\/span><br \/>\n    image_contours <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>drawContours<span class=\"token punctuation\">(<\/span>image<span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">[<\/span>screenCnt<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">255<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\"># \u900f\u89c6\u53d8\u6362<\/span><br \/>\n    warped <span class=\"token operator\">&#061;<\/span> four_point_transform<span class=\"token punctuation\">(<\/span>orig<span class=\"token punctuation\">,<\/span>screenCnt<span class=\"token punctuation\">.<\/span>reshape<span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\"># \u4e8c\u503c\u5316\u5904\u7406<\/span><br \/>\n    warped <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>cvtColor<span class=\"token punctuation\">(<\/span>warped<span class=\"token punctuation\">,<\/span>cv2<span class=\"token punctuation\">.<\/span>COLOR_BGR2GRAY<span class=\"token punctuation\">)<\/span><br \/>\n    ref <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>threshold<span class=\"token punctuation\">(<\/span>warped<span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">255<\/span><span class=\"token punctuation\">,<\/span>cv2<span class=\"token punctuation\">.<\/span>THRESH_BINARY <span class=\"token operator\">|<\/span> cv2<span class=\"token punctuation\">.<\/span>THRESH_OTSU<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<h3>\u4e09\u3001\u5b8c\u6574\u4ee3\u7801<\/h3>\n<p><span class=\"token comment\"># \u5bfc\u5165\u5de5\u5177\u5305<\/span><br \/>\n<span class=\"token keyword\">import<\/span> numpy <span class=\"token keyword\">as<\/span> np<br \/>\n<span class=\"token keyword\">import<\/span> cv2<\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">cv_show<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">,<\/span>img<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    cv2<span class=\"token punctuation\">.<\/span>imshow<span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">,<\/span>img<span class=\"token punctuation\">)<\/span><br \/>\n    cv2<span class=\"token punctuation\">.<\/span>waitKey<span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">order_points<\/span><span class=\"token punctuation\">(<\/span>pts<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token comment\"># \u4e00\u51714\u4e2a\u5750\u6807\u70b9<\/span><br \/>\n    rect <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>zeros<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>dtype<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;float32&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\"># \u7528\u6765\u5b58\u50a8\u6392\u5e8f\u4e4b\u540e\u7684\u5750\u6807\u4f4d\u7f6e<\/span><br \/>\n    <span class=\"token comment\"># \u6309\u987a\u5e8f\u627e\u5230\u5bf9\u5e94\u5750\u68070123\u5206\u522b\u662f \u5de6\u4e0a\u3001\u53f3\u4e0a\u3001\u53f3\u4e0b\u3001\u5de6\u4e0b<\/span><br \/>\n    s <span class=\"token operator\">&#061;<\/span> pts<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">sum<\/span><span class=\"token punctuation\">(<\/span>axis<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">#\u5bf9pts\u77e9\u9635\u7684\u6bcf\u4e00\u884c\u8fdb\u884c\u6c42\u548c\u64cd\u4f5c&#xff0c;&#xff08;x&#043;y&#xff09;<\/span><br \/>\n    rect<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> pts<span class=\"token punctuation\">[<\/span>np<span class=\"token punctuation\">.<\/span>argmin<span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    rect<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> pts<span class=\"token punctuation\">[<\/span>np<span class=\"token punctuation\">.<\/span>argmax<span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    diff <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>diff<span class=\"token punctuation\">(<\/span>pts<span class=\"token punctuation\">,<\/span>axis<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">#\u5bf9pts\u77e9\u9635\u7684\u6bcf\u4e00\u884c\u8fdb\u884c\u6c42\u5dee\u64cd\u4f5c&#xff0c;&#xff08;y-x&#xff09;<\/span><br \/>\n    rect<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> pts<span class=\"token punctuation\">[<\/span>np<span class=\"token punctuation\">.<\/span>argmin<span class=\"token punctuation\">(<\/span>diff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    rect<span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> pts<span class=\"token punctuation\">[<\/span>np<span class=\"token punctuation\">.<\/span>argmax<span class=\"token punctuation\">(<\/span>diff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> rect<\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">four_point_transform<\/span><span class=\"token punctuation\">(<\/span>image<span class=\"token punctuation\">,<\/span>pts<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token comment\"># \u83b7\u53d6\u8f93\u5165\u5750\u6807\u70b9<\/span><br \/>\n    rect <span class=\"token operator\">&#061;<\/span> order_points<span class=\"token punctuation\">(<\/span>pts<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">(<\/span>tl<span class=\"token punctuation\">,<\/span>tr<span class=\"token punctuation\">,<\/span>br<span class=\"token punctuation\">,<\/span>bl<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> rect<br \/>\n    <span class=\"token comment\"># \u8ba1\u7b97\u8f93\u5165\u7684w\u548ch\u503c<\/span><br \/>\n    widthA <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>sqrt<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>br<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> bl<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>br<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> bl<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    widthB <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>sqrt<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tr<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> tl<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tr<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> tl<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    maxWidth <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">max<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">(<\/span>widthA<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">(<\/span>widthB<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    heightA <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>sqrt<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tr<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> br<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tr<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> br<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    heightB <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>sqrt<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tl<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> bl<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>tl<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> bl<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">**<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    maxHeight <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">max<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">(<\/span>heightA<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token builtin\">int<\/span><span class=\"token punctuation\">(<\/span>heightB<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token comment\"># \u53d8\u6362\u540e\u5bf9\u5e94\u5750\u6807\u4f4d\u7f6e<\/span><br \/>\n    dst <span class=\"token operator\">&#061;<\/span> np<span class=\"token punctuation\">.<\/span>array<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">[<\/span>maxWidth <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                    <span class=\"token punctuation\">[<\/span>maxWidth <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span>maxHeight <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>maxHeight <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>dtype<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;float32&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    M <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>getPerspectiveTransform<span class=\"token punctuation\">(<\/span>rect<span class=\"token punctuation\">,<\/span>dst<span class=\"token punctuation\">)<\/span><br \/>\n    warped <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>warpPerspective<span class=\"token punctuation\">(<\/span>image<span class=\"token punctuation\">,<\/span>M<span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span>maxWidth<span class=\"token punctuation\">,<\/span>maxHeight<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token comment\"># \u8fd4\u56de\u53d8\u6362\u540e\u7684\u7ed3\u679c<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> warped<\/p>\n<p><span class=\"token comment\"># \u8bfb\u53d6\u8f93\u5165<\/span><br \/>\n<span class=\"token keyword\">import<\/span> cv2<br \/>\ncap <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>VideoCapture<span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u786e\u4fdd\u6444\u50cf\u5934\u662f\u53ef\u4ee5\u542f\u52a8\u7684\u72b6\u6001<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token keyword\">not<\/span> cap<span class=\"token punctuation\">.<\/span>isOpened<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span>   <span class=\"token comment\">#\u6253\u5f00\u5931\u8d25<\/span><br \/>\n    <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Cannot open camera&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    exit<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token keyword\">while<\/span> <span class=\"token boolean\">True<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    flag <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token comment\"># \u7528\u4e8e\u6807\u65f6 \u5f53\u524d\u662f\u5426\u68c0\u6d4b\u5230\u6587\u6863<\/span><br \/>\n    ret<span class=\"token punctuation\">,<\/span>image <span class=\"token operator\">&#061;<\/span> cap<span class=\"token punctuation\">.<\/span>read<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u5982\u679c\u6b63\u786e\u8bfb\u53d6\u5e27&#xff0c;ret\u4e3aTrue<\/span><br \/>\n    orig <span class=\"token operator\">&#061;<\/span> image<span class=\"token punctuation\">.<\/span>copy<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token keyword\">not<\/span> ret<span class=\"token punctuation\">:<\/span> <span class=\"token comment\">#\u8bfb\u53d6\u5931\u8d25&#xff0c;\u5219\u9000\u51fa\u5faa\u73af<\/span><br \/>\n        <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4e0d\u80fd\u8bfb\u53d6\u6444\u50cf\u5934&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><br \/>\n    cv_show<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;image&#034;<\/span><span class=\"token punctuation\">,<\/span>image<span class=\"token punctuation\">)<\/span><\/p>\n<p>    gray <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>cvtColor<span class=\"token punctuation\">(<\/span>image<span class=\"token punctuation\">,<\/span>cv2<span class=\"token punctuation\">.<\/span>COLOR_BGR2GRAY<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token comment\"># \u9884\u5904\u7406<\/span><br \/>\n    gray <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>GaussianBlur<span class=\"token punctuation\">(<\/span>gray<span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\"># \u9ad8\u65af\u6ee4\u6ce2<\/span><br \/>\n    edged <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>Canny<span class=\"token punctuation\">(<\/span>gray<span class=\"token punctuation\">,<\/span><span class=\"token number\">75<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">200<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    cv_show<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;1&#039;<\/span><span class=\"token punctuation\">,<\/span>edged<span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\"># \u8f6e\u5ed3\u68c0\u6d4b<\/span><br \/>\n    cnts <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>findContours<span class=\"token punctuation\">(<\/span>edged<span class=\"token punctuation\">,<\/span>cv2<span class=\"token punctuation\">.<\/span>RETR_EXTERNAL<span class=\"token punctuation\">,<\/span>cv2<span class=\"token punctuation\">.<\/span>CHAIN_APPROX_SIMPLE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p>    cnts <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">sorted<\/span><span class=\"token punctuation\">(<\/span>cnts<span class=\"token punctuation\">,<\/span>key<span class=\"token operator\">&#061;<\/span>cv2<span class=\"token punctuation\">.<\/span>contourArea<span class=\"token punctuation\">,<\/span>reverse<span class=\"token operator\">&#061;<\/span><span class=\"token boolean\">True<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    image_contours <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>drawContours<span class=\"token punctuation\">(<\/span>image<span class=\"token punctuation\">,<\/span>cnts<span class=\"token punctuation\">,<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">255<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    cv_show<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;image_contours&#034;<\/span><span class=\"token punctuation\">,<\/span>image_contours<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token comment\"># \u904d\u5386\u8f6e\u5ed3<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> c <span class=\"token keyword\">in<\/span> cnts<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token comment\"># \u8ba1\u7b97\u8f6e\u5ed3\u8fd1\u4f3c<\/span><br \/>\n        peri <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>arcLength<span class=\"token punctuation\">(<\/span>c<span class=\"token punctuation\">,<\/span><span class=\"token boolean\">True<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\"># \u8ba1\u7b97\u8f6e\u5ed3\u7684\u5468\u957f<\/span><br \/>\n        <span class=\"token comment\"># C \u8868\u793a\u8f93\u5165\u7684\u70b9\u96c6<\/span><br \/>\n        <span class=\"token comment\"># epsilon\u8868\u793a\u4ece\u539f\u59cb\u8f6e\u5ed3\u5230\u8fd1\u4f3c\u8f6e\u5ed3\u7684\u6700\u5927\u8ddd\u79bb&#xff0c;\u5b83\u662f\u4e00\u4e2a\u51c6\u786e\u5ea6\u53c2\u6570<\/span><br \/>\n        <span class=\"token comment\"># True\u8868\u793a\u5c01\u95ed\u7684<\/span><br \/>\n        approx <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>approxPolyDP<span class=\"token punctuation\">(<\/span>c<span class=\"token punctuation\">,<\/span><span class=\"token number\">0.05<\/span> <span class=\"token operator\">*<\/span> peri<span class=\"token punctuation\">,<\/span><span class=\"token boolean\">True<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\"># \u8f6e\u5ed3\u8fd1\u4f3c<\/span><br \/>\n        area <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>contourArea<span class=\"token punctuation\">(<\/span>approx<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token comment\"># 4\u4e2a\u70b9\u7684\u65f6\u5019\u5c31\u62ff\u51fa\u6765<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> area <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">20000<\/span> <span class=\"token keyword\">and<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>approx<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            screenCnt <span class=\"token operator\">&#061;<\/span> approx<br \/>\n            flag <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><br \/>\n            <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>peri<span class=\"token punctuation\">,<\/span>area<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u68c0\u6d4b\u5230\u6587\u6863&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> flag <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token comment\"># \u5c55\u793a\u7ed3\u679c<\/span><br \/>\n        <span class=\"token comment\"># print(&#034;STEP 2: \u83b7\u53d6\u8f6e\u5ed3&#034;)<\/span><br \/>\n        image_contours <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>drawContours<span class=\"token punctuation\">(<\/span>image<span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">[<\/span>screenCnt<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">255<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        cv_show<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;image&#034;<\/span><span class=\"token punctuation\">,<\/span>image_contours<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token comment\"># \u900f\u89c6\u53d8\u6362<\/span><br \/>\n        warped <span class=\"token operator\">&#061;<\/span> four_point_transform<span class=\"token punctuation\">(<\/span>orig<span class=\"token punctuation\">,<\/span>screenCnt<span class=\"token punctuation\">.<\/span>reshape<span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        cv_show<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;warped&#034;<\/span><span class=\"token punctuation\">,<\/span>warped<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token comment\"># \u4e8c\u503c\u5904\u7406<\/span><br \/>\n        warped <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>cvtColor<span class=\"token punctuation\">(<\/span>warped<span class=\"token punctuation\">,<\/span>cv2<span class=\"token punctuation\">.<\/span>COLOR_BGR2GRAY<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token comment\"># ref &#061; cv2.threshold(warped,220,255,cv2.THRESH_BINARY)[1]<\/span><br \/>\n        ref <span class=\"token operator\">&#061;<\/span> cv2<span class=\"token punctuation\">.<\/span>threshold<span class=\"token punctuation\">(<\/span>warped<span class=\"token punctuation\">,<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">255<\/span><span class=\"token punctuation\">,<\/span>cv2<span class=\"token punctuation\">.<\/span>THRESH_BINARY <span class=\"token operator\">|<\/span> cv2<span class=\"token punctuation\">.<\/span>THRESH_OTSU<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><br \/>\n        cv_show<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;ref&#034;<\/span><span class=\"token punctuation\">,<\/span>ref<span class=\"token punctuation\">)<\/span><br \/>\ncap<span class=\"token punctuation\">.<\/span>release<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\"># \u91ca\u653e\u6355\u6349\u5668<\/span><br \/>\ncv2<span class=\"token punctuation\">.<\/span>destroyAllWindows<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token 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