ROI is the abbreviation of Region Of Interest , which refers to the region of interest in the image. Many times, we only operate on part of the area in the image.
Example
cv2.imshow("original image", image) h, w = image.shape[:2] # 获取ROI,/表示浮点数除法，返回值是float，而//表示整数除法cy = h // 2 cx = w // 2 # ROI区域提取roi = image[cy-200:cy+200, cx-100:cx+100, :] cv2.imshow("roi", roi) # ROI区域的复制roi_copy = np.copy(roi) # 修改ROI roi[:, :, 0] = 0 cv2.imshow("roi modify", roi) # 修改拷贝的roi roi_copy[:, :, 2] = 0 cv2.imshow("roi_copy", roi_copy) # 这时的image已经被修改了，也就是roi会影响到原图，但roi的拷贝不影响cv2.imshow("image", image) cv2.waitKey(0) cv2.destroyAllWindows()
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