\u6ce8\u610f\uff1a\u9010\u50cf\u7d20\u5904\u7406\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(n\u00b2)\uff0c\u53ef\u80fd\u5bfc\u81f4\u5904\u7406\u901f\u5ea6\u4e0b\u964d90%<\/p>\n
\ud83d\udc49\u793a\u4f8b\uff1a\u4f7f\u7528OpenCV\u548cNumPy**\u5b9e\u73b0\u7070\u5ea6\u5316<\/p>\n<\/p>\n
import cv2
\nimport numpy as np<\/p>\n
# \u6807\u51c6\u7248 (\u9010\u50cf\u7d20)
\ndef pixel_by_pixel(img):
\n height, width = img.shape[:2]
\n for y in range(height):
\n for x in range(width):
\n b, g, r = img[y, x]
\n gray = int(0.114*b + 0.587*g + 0.299*r) # ITU-R BT.601\u516c\u5f0f
\n img[y, x] = [gray, gray, gray]<\/p>\n
# \u4f18\u5316\u7248 (\u5411\u91cf\u5316)
\ndef vectorized(img):
\n return cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)<\/p>\n
img = cv2.imread(\\”test.jpg\\”)
\nvectorized(img) # \u5904\u7406\u901f\u5ea6\u63d0\u53471000\u500d <\/p>\n
\u8b66\u544a\uff1a\u5927\u56fe\u50cf\u5904\u7406\u65f6\u53ef\u80fd\u5f15\u53d1\u5185\u5b58\u6ea2\u51fa<\/p>\n
\ud83d\udc49\u793a\u4f8b\uff1a\u4f7f\u7528cv2.IMREAD_UNCHANGED\u53c2\u6570<\/p>\n
# \u6807\u51c6\u7248 (\u5168\u91cf\u52a0\u8f7d)
\nimg = cv2.imread(\\”large_image.tif\\”)<\/p>\n
# \u4f18\u5316\u7248 (\u5185\u5b58\u6620\u5c04)
\nimg = cv2.imreadmulti<\/p>\n","protected":false},"excerpt":{"rendered":"
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