OpenCV 4 with Python Blueprints - Second Edition

Collecting image and object points

The process_frame method is responsible for doing the hard work of the calibration technique, and we will collect images and object points by using the following steps:

1. After the self.button_calibrate button has been clicked on, this method starts collecting data until a total of self.record_min_num_frames chessboards are detected:

    def process_frame(self, frame):        """Processes each frame"""        # if we are not recording, just display the frame        if not self.recording:            return frame        # else we're recording        img_gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)                   .astype(np.uint8)        if self.record_cnt < self.record_min_num_frames:            ret, corners = cv2.findChessboardCorners(                               img_gray,                               self.chessboard_size,                               None)

The cv2.findChessboardCorners ...