问Python OpenCv可以打开外部摄像头，但不能显示图像

EN

class Camera:
    def __init__(self, camera_index: int):
        self._camera_index = camera_index
        self._capture = None
        self._open_capture()

    def take_world_image(self):
        return self._get_camera_frame()

    def _get_camera_frame(self):
        print(self._capture.read)
        opened_successfully, current_frame = self._capture.read()
        if not opened_successfully:
            raise InvalidCameraConfigException
        return current_frame

    def _open_capture(self):
        self._capture = cv2.VideoCapture(self._camera_index)
        
    def _close_capture(self):
        self._capture.release()


if __name__ == "__main__":
    camera = Camera(1)
    while True:
        image = camera.take_world_image()
        cv2.imshow("image", image)
        if cv2.waitKey(1) & 0xFF == ord("q"):
            break
    cv2.destroyAllWindows()