mycamera.py

from picamera2 import Picamera2  # required for camera module v3
import numpy as np

class MyPiCamera():

    def __init__(self,width,height):
        self.cap = Picamera2()

        self.width = width;
        self.height = height
        self.is_open = True

        try:
            self.config = self.cap.create_video_configuration(main={"format":"RGB888","size":(width,height)})
            self.cap.align_configuration(self.config)
            self.cap.configure(self.config)

            self.cap.start()
        except:
            self.is_open = False
        return
    
    def read(self,dst=None):

        # allocate blank image to avoid returning a "None"
        if dst is  None:
            dst = np.empty((self.height, self.width, 3), dtype=np.uint8)

        if self.is_open:
            dst = self.cap.capture_array()
    
        # dst is either blank or the previously captured image at this point
        return self.is_open,dst
    def isOpened(self):
        return self.is_open
    def release(self): 
        if self.is_open is True:
             self.cap.close()
        self.is_open = False
        return

if __name__ == "__main__":
    import cv2
    camera = MyPiCamera(640,480)

    while camera.isOpened():
        _, image = camera.read()
        cv2.imshow("mycamera", image)
        
        if cv2.waitKey(1) == ord('q'):
            break

    cv2.destroyAllWindows()