Difference
Show what changed between this frame and the previous one. Pixels that stayed the same turn black; pixels that moved light up. Use it with a Webcam Image or Load Movie as a simple motion detector, or feed the result to a Threshold node to get a hard mask of the moving parts.
A still image gives a black output, because nothing changes from frame to frame.
Parameters
- Amplify Multiplies the difference, from 0 to 100. Raise it to make small movements visible.
Outputs
- Out The absolute difference between the current and the previous frame.