1 #!/usr/bin/python
 2 # -*- coding: utf-8 -*-
 3 # @Time : 2021/8/22 22:28 
 4 # @Author : yangdj 553849374@qq.com
 5 # @File : img_draw_rectangle.py 
 6 # @Software: PyCharm
 7 # 在图片中选取roi并用鼠标画出矩形框
 8 
 9 import cv2
10 
11 img = cv2.imread(r"F:\python\pytool-httpapi\static\upload\temp_files\2021-08-21\0a5f89c640124aa4b1659ade7a5e0c29.jpg")
12 
13 drawing = False
14 ix, iy = -1, -1
15 tempFlag = False
16 
17 
18 def draw_circle(event, x, y, flags, param):
19     global ix, iy, drawing, mode, cap, template, tempFlag
20     if event == cv2.EVENT_LBUTTONDOWN:
21         tempFlag = True
22         drawing = True
23         ix, iy = x, y  # 按下鼠标左键，用全局变量ix,iy记录下当前坐标点
24     elif event == cv2.EVENT_LBUTTONUP:
25         if drawing == True:
26             drawing = False  # 鼠标左键抬起，画出矩形框
27             cv2.rectangle(img, (ix, iy), (x, y), (0, 255, 0), 1)
28             template = img[iy:y, ix:x, :]  # 截取框中的目标图像
29             # 打印两个点的坐标，和最终原点+宽和高
30             print((ix, iy), (x, y), f‘{ix},{iy},{x - ix},{y - iy}‘)
31             # cap = cv2.VideoCapture(-1)       #打开摄像头
32             # cv2.imshow(‘img‘, img)  # 显示画框后的图像
33             cv2.imshow(‘template‘, template)
34 
35 
36 cv2.namedWindow("image")
37 cv2.setMouseCallback("image", draw_circle)
38 cv2.imshow("image", img)
39 
40 while (True):
41     try:
42         cv2.waitKey(100)
43     except Exception:
44         cv2.destroyAllWindows()
45         break
46 
47 cv2.waitKey(0)
48 cv2.destroyAllWindows()