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#! /usr/bin/env python
# -*- coding: utf-8

import tkinter as tk
import cv2
from PIL import Image, ImageTk

WIDTH = 640
HEIGHT = 480
DEFAULT_CAM_ID = -1

class USBCam(object):

    PROPID_WIDTH = 3
    PROPID_HEIGHT = 4
    
    def __init__(self, cam_id = DEFAULT_CAM_ID):
        self.cam = cv2.VideoCapture(cam_id)
        if not self.cam.isOpened():
           raise RuntimeError("can not open camera {0!r}".format(
                cam_id))
        self.width = int(self.cam.get(self.PROPID_WIDTH))
        self.height = int(self.cam.get(self.PROPID_HEIGHT))
            
    @property
    def size(self):
        return self.width, self.height
                
    def __enter__(self):
        return self

    def __exit__(self, *args):
        self.release()
                                
    def get_image(self):
        state, frame = self.cam.read()

        if not state:
            raise RuntimeError("could not read image")
        else:
            return frame
            
    def release(self):
        self.cam.release()
        
        
class USBCamUI(tk.Frame):
    def __init__(self, parent, usb_cam, width, height, 
        update_interval = 100):
        tk.Frame.__init__(self, parent)
        self.parent = parent
        self.usb_cam = usb_cam
        self.width = width
        self.height = height
        self.update_interval = update_interval
        self.after_id = None
        self.tk_image = None
        self.image_label = tk.Label(self)
        self.image_label.pack()
        
    def run(self):
        try:
            tk_image = Image.frombytes("RGB",  self.usb_cam.size,
                self.usb_cam.get_image(), "raw", "BGR").resize(
                (self.width, self.height))
        except RuntimeError:
            self.raise_cam_id_error()
            return
        self.tk_image = ImageTk.PhotoImage(tk_image)
        self.image_label.config(image = self.tk_image)
        self.after_id = self.after(self.update_interval, self.run)
        
    def release(self):
        self.after_cancel(self.after_id)
        self.parent.destroy()
        
def main():
    root = tk.Tk()
    root.title("USB CAM")
    root.resizable(0, 0)

    try:
        with USBCam() as usb_cam:
            usb_cam_ui = USBCamUI(root, usb_cam, WIDTH, HEIGHT)
            usb_cam_ui.pack()
            usb_cam_ui.run()
            root.protocol("WM_DELETE_WINDOW", usb_cam_ui.release)
            root.mainloop()
    except RuntimeError:
        tk.Label(root, text = "can not open camera {0!r}".format(
                DEFAULT_CAM_ID), font = "Arial 20", height = 10).pack()
        root.mainloop()

if __name__ == "__main__":
    main()

Code: Alles auswählen

Collecting opencv-python
  Using cached https://files.pythonhosted.org/packages/a1/d6/8422797e35f8814b1d9842530566a949d9b5850a466321a6c1d5a99055ee/opencv-python-4.3.0.38.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-3e1f61xv/opencv-python/setup.py", line 9, in <module>
        import skbuild
    ModuleNotFoundError: No module named 'skbuild'
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-3e1f61xv/opencv-python/