使用多处理在tkinter中显示OpenCV视频

Question

我目前正在尝试为多处理的OpenCV视频流开发GUI.下面的代码确实成功地实现了这一点,因为它显示了视频源和"退出"按钮,但以奇怪的方式运行:

• 该方案提出了一个运行时错误的pythonw.exe(我使用Windows)在退出(或者由quit button或通过单击关闭窗口'X')称该计划"要求运行在一个不寻常的方式终止"

任何关于如何解决这个问题的想法将不胜感激!

我的代码:

#!/usr/bin/python

import numpy as np
from multiprocessing import Process, Queue
from Queue import Empty
import cv2
import cv2.cv as cv
from PIL import Image, ImageTk
import time
import Tkinter as tk

#tkinter GUI functions----------------------------------------------------------
def quit_(root, process):
   process.join()
   root.destroy()

def update_image(image_label, queue):
   frame = queue.get()
   im = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
   a = Image.fromarray(im)
   b = ImageTk.PhotoImage(image=a)
   image_label.configure(image=b)
   image_label._image_cache = b  # avoid garbage collection
   root.update()

def update_all(root, image_label, queue):
   update_image(image_label, queue)
   root.after(0, func=lambda: update_all(root, image_label, queue))

#multiprocessing image processing functions-------------------------------------
def image_capture(queue):
   vidFile = cv2.VideoCapture(0)
   while True:
      try:
         flag, frame=vidFile.read()
         if flag==0:
            break
         queue.put(frame)
         cv2.waitKey(20)
      except:
         continue

if __name__ == '__main__':
   queue = Queue()
   print 'queue initialized...'
   root = tk.Tk()
   print 'GUI initialized...'
   image_label = tk.Label(master=root)# label for the video frame
   image_label.pack()
   print 'GUI image label initialized...'
   p = Process(target=image_capture, args=(queue,))
   p.start()
   print 'image capture process has started...'
   # quit button
   quit_button = tk.Button(master=root, text='Quit',command=lambda: quit_(root,p))
   quit_button.pack()
   print 'quit button initialized...'
   # setup the update callback
   root.after(0, func=lambda: update_all(root, image_label, queue))
   print 'root.after was called...'
   root.mainloop()
   print 'mainloop exit'
   p.join()
   print 'image capture process exit'

• 配置:Windows 7 Home,Python 2.7.5,OpenCV 2.4
• 免责声明:上述代码的灵感来自于此.

Answer 1

我通过使用process.terminate()而不是process.join()在quit_(root, process)函数中解决它.