OpenCV-選定攝像頭圖像區域，顯示對比度和Lab中的L份量

import cv2 import numpy as np rectangle_flag = 0 global ix_start, iy_start, ix_end, iy_end ix_start = -1 iy_start = -1 ix_end = 0 iy_end = 0 global drawing drawing =

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