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 ... ... <看更多>

如果要將來源影片(不論來源是攝影機影像還是影片)要存成圖片的話只要使用 cv2.imwrite() 就可以了， 那如果想要存成影片檔的話，我們可以使用 VideoWriter ... ... <看更多>

The problem does not occur on OpenCV 3.0.0, other versions untested. Steps to reproduce. cv::Mat1b m = cv::Mat1b::zeros(10, 10); cv ... ... <看更多>