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並前往https://stackoverflow.com/questions/45946873/how-to-correctly-use-cv2-imwrite-to-save-an-image-in-opencv-with-cv2-selectroi

How to correctly use cv2.imwrite to save an image in openCV ...

cv2.selectROI returns the (x,y,w,h) values of a rectangle similar to cv2.boundingRect() . My guess is that the saved black rectangle is due to rounding ...

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