OpenCV with Python Blueprints

Setting up the app

In order to run our app, we will need to execute a main function routine that reads a frame of a video stream, generates a saliency map, extracts the location of the proto-objects, and tracks these locations from one frame to the next.

The main function routine

The main process flow is handled by the main function in chapter5.py, which instantiates the two classes (Saliency and MultipleObjectTracker) and opens a video file showing the number of soccer players on the field:

import cv2 import numpy as np from os import path from saliency import Saliency from tracking import MultipleObjectsTracker def main(video_file='soccer.avi', roi=((140, 100), (500, 600))): if path.isfile(video_file): video = cv2.VideoCapture(video_file) else: ...