1 # 在图片中选取roi并用鼠标画出矩形框
2 import cv2
3 img = cv2.imread("left0.jpg")
4
5
6 drawing = False
7 ix, iy = -1, -1
8 tempFlag = False
9 def draw_circle(event, x, y, flags, param):
10 global ix, iy, drawing, mode, cap, template, tempFlag
11 if event == cv2.EVENT_LBUTTONDOWN:
12 tempFlag = True
13 drawing = True
14 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
15 elif event == cv2.EVENT_LBUTTONUP:
16 if drawing == True:
17 drawing = False #鼠标左键抬起，画出矩形框
18 cv2.rectangle(img, (ix, iy), (x, y), (0, 255, 0), 1)
19 template = img[iy:y, ix:x, :] #截取框中的目标图像
20 print(ix,iy,x,y)
21 #cap = cv2.VideoCapture(-1) #打开摄像头
22 cv2.imshow('img', img) #显示画框后的图像
23 cv2.imshow('template',template)
24
25
26 cv2.namedWindow("image")
27 cv2.setMouseCallback("image", draw_circle)
28 cv2.imshow("image", img)
29
30 while (True):
31 try:
32 cv2.waitKey(100)
33 except Exception:
34 cv2.destroyAllWindows()
35 break
36
37 cv2.waitKey(0)
38 cv2.destroyAllWindows()
