cv2

import random
import cv2


img_file = './learn/demo-opencv/demo.png'
img_file_result = '../demo.jpg'
# 彩色
img = cv2.imread(img_file, flags=cv2.IMREAD_COLOR)
# cv2.line(img,(20,400),(400,20),(0, 0, 0),3)
cv2.namedWindow("renho", cv2.WINDOW_NORMAL)
while True:
    max_x = img.shape[0]
    max_y = img.shape[1]
    start_xy = (random.randint(0, max_y), random.randint(0, max_x))
    end_xy = (random.randint(0, max_y), random.randint(0, max_x))
    rgb = (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))

    cv2.rectangle(img, start_xy, end_xy, rgb, 5)
    cv2.imshow('renho', img)
    if cv2.waitKey(100) == ord("q"):
        break
    print('next')