如何在Tkinter Canvas中显示摄像头画面？代码问题求助

我开发了一个基于Tkinter和CustomTkinter的GUI，其中Canvas默认显示一张图片，且设有一个开关，切换时会打印Cam On或Cam off。我期望打开该开关时，用摄像头实时流替换默认图片。

我找到了一段可在独立Canvas中实现摄像头画面显示的代码，但无法将其逻辑整合到我的GUI代码中。

尝试合并代码后，切换开关时摄像头已启动（硬件指示灯亮起、系统弹出程序启动摄像头的通知），但画面并未显示在Canvas上，恳请帮忙排查并解决该问题。

原始GUI代码 #

import tkinter
import tkinter.messagebox
import customtkinter
from PIL import Image,ImageTk


# Setting up theme of GUI
customtkinter.set_appearance_mode("Dark")  # Modes: "System" (standard), "Dark", "Light"
customtkinter.set_default_color_theme("blue")  # Themes: "blue" (standard), "green", "dark-blue"

class App(customtkinter.CTk):
    def __init__(self):
        super().__init__()

        # configure window
        self.is_on = True
        self.image = ImageTk.PhotoImage(Image.open("../data/Mars.PNG"))

        self.title("Cool Blue")
        self.geometry(f"{1200}x{635}")

        # configure grid layout (4x4)
        self.grid_columnconfigure(1, weight=1)
        self.grid_columnconfigure((2, 3), weight=0)
        self.grid_rowconfigure((0, 1, 2, 3), weight=0)

        ###################################################################
        # Create Sidebar for LED, LIghts and Camera controls
        ###################################################################
        self.lights_control = customtkinter.CTkFrame(self)
        self.lights_control.grid(row=3, column=0, rowspan = 1, padx=(5, 5), pady=(10, 10), sticky="nsew")
        self.lights_control.grid_rowconfigure(1, weight=1)

        # Camera
        self.camera_switch = customtkinter.CTkSwitch(master=self.lights_control, text="Camera", command=self.camera_switch)
        self.camera_switch.grid(row=2, column=1, pady=10, padx=20, )

        ###################################################################
        # Create canvas for RPCam live stream
        ###################################################################
        self.picam_frame = customtkinter.CTkFrame(self)
        self.picam_frame.grid(row=0, column=1, rowspan=4, padx=(5, 5), pady=(10, 10), sticky="nsew")
        self.picam_frame.grid_rowconfigure(4, weight=1)
        self.picam_canvas = customtkinter.CTkCanvas(self.picam_frame, width=1730, height=944, background="gray")
        self.picam_canvas.create_image(0, 0, image=self.image, anchor="nw")
        self.picam_canvas.pack()

    #########################################################################
    # Camera Switch
    #########################################################################
    def camera_switch(self, event=None):

        if self.is_on:

            print("Cam on")

            self.is_on = False
        else:
            print("Cam off")

            self.is_on = True


if __name__ == "__main__":
    app = App()
    app.mainloop()

参考代码 #

# Import required Libraries
from tkinter import *
from PIL import Image, ImageTk
import cv2

# Create an instance of TKinter Window or frame
win = Tk()

# Set the size of the window
win.geometry("700x350")

# Create a Label to capture the Video frames
label =Label(win)
label.grid(row=0, column=0)
cap= cv2.VideoCapture(0)

# Define function to show frame
def show_frames():
   # Get the latest frame and convert into Image
   cv2image= cv2.cvtColor(cap.read()[1],cv2.COLOR_BGR2RGB)
   img = Image.fromarray(cv2image)
   # Convert image to PhotoImage
   imgtk = ImageTk.PhotoImage(image = img)
   label.imgtk = imgtk
   label.configure(image=imgtk)
   # Repeat after an interval to capture continiously
   label.after(20, show_frames)

show_frames()
win.mainloop()

尝试后的代码 #

import tkinter
import tkinter.messagebox
import customtkinter
from PIL import Image,ImageTk
import cv2


# Setting up theme of GUI
customtkinter.set_appearance_mode("Dark")  # Modes: "System" (standard), "Dark", "Light"
customtkinter.set_default_color_theme("blue")  # Themes: "blue" (standard), "green", "dark-blue"

class App(customtkinter.CTk):
    def __init__(self):
        super().__init__()

        # configure window
        self.is_on = True
        self.image = ImageTk.PhotoImage(Image.open("../data/Mars.PNG"))
        self.capture = cv2.VideoCapture(0)

        self.title("Cool Blue")
        self.geometry(f"{1200}x{635}")

        # configure grid layout (4x4)
        self.grid_columnconfigure(1, weight=1)
        self.grid_columnconfigure((2, 3), weight=0)
        self.grid_rowconfigure((0, 1, 2, 3), weight=0)

        ###################################################################
        # Create Sidebar for LED, LIghts and Camera controls
        ###################################################################
        self.lights_control = customtkinter.CTkFrame(self)
        self.lights_control.grid(row=3, column=0, rowspan = 1, padx=(5, 5), pady=(10, 10), sticky="nsew")
        self.lights_control.grid_rowconfigure(1, weight=1)

        # Camera
        self.camera_switch = customtkinter.CTkSwitch(master=self.lights_control, text="Camera", command=self.camera_switch)
        self.camera_switch.grid(row=2, column=1, pady=10, padx=20, )

        ###################################################################
        # Create canvas for RPCam live stream
        ###################################################################
        self.picam_frame = customtkinter.CTkFrame(self)
        self.picam_frame.grid(row=0, column=1, rowspan=4, padx=(5, 5), pady=(10, 10), sticky="nsew")
        self.picam_frame.grid_rowconfigure(4, weight=1)


        # self.picam_canvas = customtkinter.CTkCanvas(self.picam_frame, width=1730, height=944, background="gray")
        # self.picam_canvas.create_image(0, 0, image=self.image, anchor="nw")

        self.picam_canvas = tkinter.Canvas(self.picam_frame, width=1730, height=944)
        #self.picam_canvas.pack


    #########################################################################
    # Camera Switch
    #########################################################################
    def camera_switch(self, event=None):

        if self.is_on:
            self.update_frames()

            print("Cam on")

            self.is_on = False
        else:
            #self.close_camera()
            self.image
            print("Cam off")

            self.is_on = True


    def update_frames(self):
        # Get the current frame from the webcam
        _, frame = self.capture.read()

        # Convert the frame to a PhotoImage object
        frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
        frame = Image.fromarray(frame)
        frame = ImageTk.PhotoImage(frame)

        # Update the canvas with the new frame
        self.picam_canvas.create_image(0, 0, image=frame, anchor="nw")
        self.picam_canvas.image = frame

        # Schedule the next update
        self.after(1000, self.update_frames)
    def close_camera(self):
        self.capture.release()

if __name__ == "__main__":
    app = App()
    app.mainloop()

内容的提问来源于stack exchange，提问作者Slavisha84