Video-Based Change Detection
This system compares two video streams recorded at different times and automatically detects features that changed during the interval. The systems flags these differences to allow a user to quickly see what changed, making it a good tool for security and reconnaissance applications. Developed by CSAIL's Robotics, Vision, and Sensor Networks Group.
For more info:
http://rvsn.csail.mit.edu/vid-match/overview/
