import cv2
import random

img=cv2.imread('lena.jpg')
width,height,depth=img.shape
img_width_box=width*0.2
img_height_box=height*0.2
print(img_width_box,img_height_box)
for _ in range(9):
    start_pointX=random.uniform(0,img_width_box)
    start_pointY=random.uniform(0,img_height_box)
    print(start_pointX,start_pointY)
    copyImg=img[int(start_pointX):1000,int(start_pointY):800]
    cv2.imshow('test',copyImg)
    cv2.waitKey(0)