["python","opencv","computer-vision","object-detection","draw"]
OpenCV: draw a rectangle around a region

How can I use OpenCV in Python to draw rectangles around some regions within an image for object detection purposes?
Use cv2: import cv2 cv2.rectangle(img, (x1, y1), (x2, y2), color=(255,0,0), thickness=2) x1,y1 ------ | | | | | | --------x2,y2 [edit] to append the follow-up questions below: cv2.imwrite("my.png",img) cv2.imshow("lalala", img) k = cv2.waitKey(0) # 0==wait forever