Cv2.rectangle() picture frame

 This function depends on   Determine the diagonal   To draw a rectangle .
cv2.rectangle(img, (bbox.left, bbox.top), (bbox.right, bbox.bottom), (0,0,255), 2)

cv2 Read image , Then input the pixel coordinates of the upper left corner and the lower right corner respectively ,（0,0,255） Is to set the color of the line .