GUI开发：实时显示摄像头图像

 import tkinter as tk

 from PIL import Image, ImageTk

 import cv2

 import numpy as np

 import time

 g_exit = False

 def close_window():

     global g_exit

     g_exit = True

 def video_init():

     cap = cv2.VideoCapture(0)

     cap.set(3, 640)

     cap.set(4, 480)

     time.sleep(2)

     return cap

 def video_show():

     cap = video_init()

     while (cap.isOpened() and g_exit == False):

         ret, frame = cap.read()

         if ret == True:

             frame = cv2.flip(frame, 1)

             # 将图像的通道顺序由BGR转换成RGB

             frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)

             if isinstance(frame, np.ndarray):

                 frame = Image.fromarray(frame.astype(np.uint8))

             photo = ImageTk.PhotoImage(image=frame)

             image_cvs.create_image([320, 240], image=photo)

             win.update_idletasks()

             win.update()

     cap.release()

     win.quit()

 if __name__ == '__main__':

     win = tk.Tk()

     image_cvs = tk.Canvas(win, width=640, height=480, bg='white')

     image_cvs.pack()

     # 点击界面右上角的关闭按钮时，会触发'WM_DELETE_WINDOW'消息

     # 我们在此截获该消息，并改变其行为

     win.protocol('WM_DELETE_WINDOW', close_window)

     win.after(200, video_show)

     win.mainloop()

在使用Canvas显式图片时，其image参数有两个重要的点需要注意，一个是格式，另外一个是要保持持续引用（可使用全局变量）。如下：

The image object should be a PhotoImage or BitmapImage, or a compatible object (such as the PIL PhotoImage).
The application must keep a reference to the image object.

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GUI开发：实时显示摄像头图像

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