This is a dead-simple movement detection application with slack notification.
To install, configure and run the script, see sentry.py.
The detection algorithm is based on the work of Kameda, Y. & Minoh, M. in "A human motion estimation method using 3-successive video frames."
The idea is to compare a frame against the previous and next one, and apply a bitwise and to the result. That way we can remove most of the artifacts of a temporal comparison.
The movement is then obtained by looking at pixels above a certain threshold in that final and image. In this version, number of pixels changing is also monitored in order to reject case with too many changes (e.g.: major background change, camera movement, etc.)
This script is released under the MIT License.
OpenCV is used in respect with its 3-clause BSD License.
Requests is used in respect with its Apache License, Version 2.0.
All references to TeamFortress and Valve are properties of their respective owners.