GUI开发：实时显示摄像头图像

 1 import tkinter as tk
 2 from PIL import Image, ImageTk
 3 import cv2
 4 import numpy as np
 5 import time
 6 
 7 g_exit = False
 8 
 9 def close_window():
10     global g_exit
11     g_exit = True
12 
13 def video_init():
14     cap = cv2.VideoCapture(0)
15     cap.set(3, 640)
16     cap.set(4, 480)
17     time.sleep(2)
18     return cap
19 
20 def video_show():
21     cap = video_init()
22     while (cap.isOpened() and g_exit == False):
23         ret, frame = cap.read()
24         if ret == True:
25             frame = cv2.flip(frame, 1)
26             # 将图像的通道顺序由BGR转换成RGB
27             frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
28             if isinstance(frame, np.ndarray):
29                 frame = Image.fromarray(frame.astype(np.uint8))
30 
31             photo = ImageTk.PhotoImage(image=frame)
32             image_cvs.create_image([320, 240], image=photo)
33 
34             win.update_idletasks()
35             win.update()
36     cap.release()
37     win.quit()
38 
39 if __name__ == '__main__':
40     win = tk.Tk()
41     image_cvs = tk.Canvas(win, width=640, height=480, bg='white')
42     image_cvs.pack()
43 
44     # 点击界面右上角的关闭按钮时，会触发'WM_DELETE_WINDOW'消息
45     # 我们在此截获该消息，并改变其行为
46     win.protocol('WM_DELETE_WINDOW', close_window)
47 
48     win.after(200, video_show)
49     win.mainloop()