Multiprocessed motion detector & tracker

Multiprocessed Python OpenCV motion detector with an optional tracker.

requirements

Opencv >= 4.4.0.0 (recommended with 'pip3 install opencv-contrib-python')
numpy >= 1.18.0
python >= 3.6

Installation & Use

Clone the repository, checkout to desired branch (with tracker or without). open the 'multiprocessed-motiondetector-tracker.py'

# change the variable:
examplevideo = '' # to your video path, or otherwise an IP to your stream

simply run the script.

How does it work?

The algorithm runs on multiple layers, on top, it is multiprocessed using 3 processes. The first process, called CameraProcess, is a function responsible for handling the video buffer and sending the frames to the second process, called the AlgorithmProcess, it handles the motion detector and the tracker.

The motion detector uses the background subtraction algorithm for detection, therefore it's weakness is moving cameras. The motion detector scans sectors also know as 'blocks' from the subtracted images, like a "delta" image. if the scan senses motion, which is represented in the subtracted image output as white colored area, it appends it. Once the scan is complete, the algorithm connects the "blocks" using standard opencv method, which outputs a block with size proportional to the connected blocks, in averaged out area. The process continues until all blocks are connected or removed if they are too small (This can be changed by tweaking the parameters). The output of this process will be a list of ROIs (Region On Interests) as a (X,Y,W,H) tuples list. The largest ROI is sent to the tracker to initiate tracking on the object in the ROI. Once the tracker is initiated successfully it will either follow the moving object, or freeze on the same place. To avert losing the target and locking on the background, the tracker is stopped after N seconds of motionlessness. The number of seconds to wait (N) can be tweaked by user

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