Canvas窗口组件显示摄像头采集图像不流畅问题求助

stephencloud

各位大大，主要问题是画面时常闪烁，我想了解一下是什么原因，有什么办法处理吗？另外在canvas组件上刷新画面需要把旧图删除吗？

以下是程序：
import cv2
from tkinter import *
from tkinter import filedialog
from PIL import Image, ImageTk
import threading

#window define
window = Tk()
window.title('xxx')
window.attributes("-topmost", True)

sw = window.winfo_screenwidth()
sh = window.winfo_screenheight()
print(sw,sh)
wx = 640
wh = 640
window.geometry("%dx%d+%d+%d" % (wx*2, wh, 100, 100) )

canvas = Canvas(window, bg='#c4c2c2', height = 480,width = 640*2)
canvas.place(x=0,y=160)

def dd():
    capture = cv2.VideoCapture(0)
    while True:
        ret, frame = capture.read()
        #image shefter
        #frame = cv2.flip(frame, 1)
        #image formate change
        cv2image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)
        img = Image.fromarray(cv2image)
        image_file=ImageTk.PhotoImage(img)
        #draw shefter image
        canvas.create_image(0,0,anchor='nw',image=image_file)
        canvas.create_text(10,10,text='Shefter image',anchor=NW,fill='red',font='14')
        canvas.create_text(20,470,text='Scale:20*5 pixel',anchor=SW,fill='red',font='14')
        #draw orginal image
        canvas.create_image(640,0,anchor='nw',image=image_file)
        canvas.create_text(650,10,text='Orginal image',anchor=NW,fill='green',font='14')
        if( cv2.waitKey(500) >= 0):
            break
  
t1=threading.Thread(target=dd)
t1.start()

mainloop()

塔利班

500你是想做啥

stephencloud

改10也没用

stephencloud

数字小了闪的眼花

塔利班

线程的锅，我忘了事件是什么了，给个左键的

1. import cv2
   
2. from tkinter import *
   
3. from tkinter import filedialog
   
4. from PIL import Image, ImageTk
   
5. import threading
   
6. 
   
7. #window define
   
8. window = Tk()
   
9. window.title('xxx')
   
10. window.attributes("-topmost", True)
    
11. 
    
12. sw = window.winfo_screenwidth()
    
13. sh = window.winfo_screenheight()
    
14. print(sw,sh)
    
15. wx = 640
    
16. wh = 640
    
17. window.geometry("%dx%d+%d+%d" % (wx*2, wh, 100, 100) )
    
18. 
    
19. canvas = Canvas(window, bg='#c4c2c2', height = 480,width = 640*2)
    
20. canvas.place(x=0,y=160)
    
21. def dd(event):
    
22.     capture = cv2.VideoCapture(0)
    
23.     while True:
    
24.         ret, frame = capture.read()
    
25.         #image shefter
    
26.         #frame = cv2.flip(frame, 1)
    
27.         #image formate change
    
28.         cv2image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)
    
29.         img = Image.fromarray(cv2image)
    
30.         image_file=ImageTk.PhotoImage(img)
    
31.         #draw shefter image
    
32.         canvas.create_image(0,0,anchor='nw',image=image_file)
    
33.         canvas.create_text(10,10,text='Shefter image',anchor=NW,fill='red',font='14')
    
34.         canvas.create_text(20,470,text='Scale:20*5 pixel',anchor=SW,fill='red',font='14')
    
35.         #draw orginal image
    
36.         canvas.create_image(640,0,anchor='nw',image=image_file)
    
37.         canvas.create_text(650,10,text='Orginal image',anchor=NW,fill='green',font='14')
    
38.         canvas.update()
    
39.         if( cv2.waitKey(40) >= 0):
    
40.             break
    
41. canvas.bind('<Button-1>',dd)
    
42. 
    
43. 
    
44. 
    
45. mainloop()
    

复制代码

stephencloud

感谢大大，修改程序后点左键能显示一张图片，再点左键程序死了，我需要做到动态显示摄像头拍到的内容；
早前我用cv2.imshow('src', frame)的命令动态刷新没有闪烁的问题，但现在我要用tkinter做界面，改用的canvas + Thread的方式，就有这个问题；
我注意到新的程序多了下面3行格式转换，无法直接用从摄像头读到的数据，闪烁是因为转换时间太长引起的吗？写个程序测试一下，谢谢！
cv2image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)
img = Image.fromarray(cv2image)
image_file=ImageTk.PhotoImage(img)

图片大小是640*480的