OpenCV 4 with Python Blueprints - Second Edition

Implementing the main function

The main process flow is handled by the main function in chapter6.py, which instantiates the tracker (MultipleObjectTracker) and opens a video file showing the number of soccer players on the field:

import cv2from os import pathfrom saliency import get_saliency_map, get_proto_objects_mapfrom tracking import MultipleObjectsTrackerdef main(video_file='soccer.avi', roi=((140, 100), (500, 600))):    if not path.isfile(video_file):        print(f'File "{video_file}" does not exist.')        raise SystemExit    # open video file    video = cv2.VideoCapture(video_file)    # initialize tracker    mot = MultipleObjectsTracker()

The function will then read the video frame by frame and extract some meaningful region of interest (for illustration ...