Wednesday, June 1, 2011

Behavior Subtraction

The following is an interesting paper on behavior subtraction. It basically talks about detection abornal activity in a visual scene.

The authors of the paper seem to detect abnormal activity in a busy area (like an interstate highway) by just performing simple static background subtraction. They add the background subtracted images for each frame over time (spatio temporal) and subtract the default background image to create a behavior image of the area.

Then to detect abnormal activity, they simply subtract the new frame from the behavior image (after setting a threshold).

The idea is pretty intuitive and also very effective.

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