Zero coordinates system is the upper left corner of the image, X-axis is a rectangular piece of the image above the horizon; the Y-axis of a rectangular piece of the image on the left vertical line. X, Y are positive, the coordinate system in the body, such as Mat structure, Rect, Point in are suitable.
img = np.zeros((500, 500, 3), dtype=np.uint8) img[:, :, :] = 255 cv2.rectangle(img, (100, 100), (400, 400), [0, 0, 255]) cv2.rectangle(img, (200, 200), (300, 300), [0, 0, 255]) cv2.imshow("img", img) cv2.waitKey(-1)
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