Python Tkinter OpenCV PIL 图像调整大小以适合标签

Question

我正在尝试调整我的网络摄像头输出的大小以适应标签，但我无法真正让它发挥作用。如果您决定尝试测试代码，我在标签中放置了一个蓝色背景，作为您需要调整网络摄像头输出大小的指南。

密码是：

from Tkinter import *
import cv2
from PIL import Image, ImageTk

isrunning = 0

def start():
    global isrunning
    if isrunning == 0:
        global cap
        cap = cv2.VideoCapture(0)
        isrunning = 1
        lmain.grid(row = 1,column = 1)
        def show_frame():
            _, frame = cap.read()
            frame = cv2.flip(frame, 1)
            cv2image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)
            img = Image.fromarray(cv2image)
            imgtk = ImageTk.PhotoImage(image=img)
            lmain.imgtk = imgtk
            lmain.configure(image=imgtk)
            if isrunning == 1:
                lmain.after(10, show_frame)
    show_frame()

def Stop():
    global isrunning
    isrunning = 0
    lmain.grid_forget()

def main():
    Stop()
    Reset.invoke()
    stopFunc.invoke()

root = Tk()
lmain = Label(root, width = 800, height = 600, bg = "blue")
stopFunc = Button(root, text = "stop", command = Stop)
Reset = Button(root, text = "Reset", command = start)
Main = Button(root, text = "Stop", command = main)
Start = Button(root, text = "Start", command = start)
Start.grid(row = 0, column = 0)
Main.grid(row = 0, column = 1)

root.mainloop()

Answer 1

我试过你的代码，我在这里修改了一些代码：

from Tkinter import *
import cv2
from PIL import Image, ImageTk

isrunning = 0

def start():
    global isrunning
    if isrunning == 0:
        global cap
        cap = cv2.VideoCapture(0)
        isrunning = 1
        lmain.grid(row = 1,column = 1)
        def show_frame():
            _, frame = cap.read()
            frame = cv2.flip(frame, 1)
            frame = cv2.resize(frame, (800,600)) 
            cv2image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)
            img = Image.fromarray(cv2image)
            imgtk = ImageTk.PhotoImage(image=img)
            lmain.imgtk = imgtk
            lmain.configure(image=imgtk)
            if isrunning == 1:
                lmain.after(10, show_frame)
            else:
                cap.release()
    show_frame()

def Stop():
    global isrunning
    isrunning = 0
    lmain.grid_forget()

def main():
    Stop()
    #Reset.invoke()
    #stopFunc.invoke()

root = Tk()
lmain = Label(root, width = 800, height = 600, bg = "blue")
stopFunc = Button(root, text = "stop", command = Stop)
Reset = Button(root, text = "Reset", command = start)
Main = Button(root, text = "Stop", command = main)
Start = Button(root, text = "Start", command = start)
Start.grid(row = 0, column = 0)
Main.grid(row = 0, column = 1)

root.mainloop()

如您所见，我添加了一行：frame = cv2.resize(frame, (800,600)) 来调整图像的大小。

而且我发现在我添加这一行之后，当我按下"Stop"按钮时出现了错误。所以我尝试在每次按下 "Stop" 按钮时使用 cap.release() 释放相机。但是我现在没有网络摄像头来测试这段代码，我不能确保当你重新启动流时它会工作。希望对你有帮助。

Python Tkinter OpenCV PIL 图像调整大小以适合标签

Python Tkinter OpenCV PIL image resize to fit label

python

opencv

tkinter

python-3.x

pillow