camera.py

import cv2 as cv

class Camera:

    def __init__(self): #constructor
        self.camera = cv.VideoCapture(0)  # 0 indicates only one web cam is used(if 2 then(0,1) is used)
        if not self.camera.isOpened(): # if camera is not opened then raise an error
            raise ValueError("Unable to open camera!")

        self.width = self.camera.get(cv.CAP_PROP_FRAME_WIDTH) #width of a camera
        self.height = self.camera.get(cv.CAP_PROP_FRAME_HEIGHT)

    def __del__(self): #destructor
        if self.camera.isOpened(): #if camera is opened/and is not in used then
            self.camera.release() # it is released or closed

    def get_frame(self):
        if self.camera.isOpened(): # if camera is opened then
            ret, frame = self.camera.read() #read the camera

            if ret:
                return (ret, cv.cvtColor(frame, cv.COLOR_BGR2RGB)) #if return exists then,color is set to red,green,blue
            else:
                return (ret, None) #if return donot exist then none
        else:

            return None #none of these cases then return none