OpenCV 4 with Python Blueprints - Second Edition

Running the app – the main() function routine

To run our app, we will need to execute the main() function routine. The following steps show us the execution of main() routine:

1. The function first accesses the webcam with the VideoCapture method by passing 0 as an argument, which is a reference to the default webcam. If it can not access the webcam, the app will be terminated:

import cv2 as cvfrom feature_matching import FeatureMatchingdef main():    capture = cv.VideoCapture(0)    assert capture.isOpened(), "Cannot connect to camera"

2. Then, the desired frame size and frame per second of the video stream is set. The following snippet shows the code for setting the frame size and frame per second of the video:

 capture.set(cv.CAP_PROP_FPS, 10) ...