How (using what) is it possible to implement an alarm based on a change in the webcam image?

Question

Image processing

Hello.
Please indicate where to dig. No ideas.
Thank you.

Answer 1

Motion can capture video from cameras, detect motion and run any program/script on this event www.lavrsen.dk/foswiki/bin/view/Motion/MotionGuide...

Answer 2

The finished solution is called motion

Answer 3

Determining the contours of two frames and subtracting the current frame from the previous one.
If nothing has changed, there will be an empty set. Otherwise, there was movement.

Answer 4

comparison with a reference image, the presence of motion, sound, etc.
sf.net/projects/ispysoftware