[英]How to display an image from OpenCV in a Tkinter interface?
我正在嘗試在取自 OpenCV 的 VideoCapture 的 Tkinter 界面中連續顯示和替換圖像。 但是,我收到以下錯誤,我認為這是圖像 numpy 數組格式不正確的結果:
類型錯誤:不可散列類型:'numpy.ndarray'
如何將其重新格式化為所有內容以正確顯示? 下面是我的代碼:
import tkinter as tk
import cv2
import numpy as np
from PIL import ImageTk, Image
main = tk.Tk()
main.title("Hole Pattern Recognition")
main.geometry("300x300")
frame = tk.Frame(main)
frame.pack()
def startScan():
global main, frame
#begins utilizing webcam for scan
cap = cv2.VideoCapture(0)
while(True):
ret,img = cap.read()
img = ImageTk.PhotoImage(img)
panel = tk.Label(main, image = img)
panel.pack(side = "bottom", fill = "both", expand = "yes")
ch = cv2.waitKey(1)
if ch == ord('q'):
break
cap.release()
cv2.destroyAllWindows()
startButton = tk.Button(frame,
text="Start Scan",
fg="blue",
command=startScan)
startButton.pack(side=tk.TOP)
main.mainloop()
首先,您需要使用PIL.Image.fromarray()
將捕獲的圖像轉換為PIL.Image.fromarray()
支持的格式。
其次最好不要在主線程中使用 while 循環,因為它會阻塞 tkinter 主循環。 使用after()
代替。
import tkinter as tk
from PIL import Image, ImageTk
import cv2
cap = None
main = tk.Tk()
main.title('Hole Pattern Recognition')
#main.geometry('300x300')
frame = tk.Frame(main)
frame.pack()
def startScan():
global cap
def scan():
ret, img = cap.read()
if ret:
img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
img = Image.fromarray(img)
tkimg = ImageTk.PhotoImage(img)
panel.config(image=tkimg)
panel.tkimg = tkimg # save a reference to the image to avoid garbage collection
panel.after(25, scan) # change 25 to other value to adjust FPS
if cap is None:
cap = cv2.VideoCapture(0)
scan() # start the capture loop
else:
print('capture already started')
startButton = tk.Button(frame, text='Start Scan', fg='blue', command=startScan)
startButton.pack()
panel = tk.Label(main)
panel.pack()
main.mainloop()
if cap:
cap.release()
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