Independent Motion Detector
First, I took two image and created a mosaic out them: |  |
The above mosaic has an average of the two images on overlapping areas. When finding the independent motion, I took the difference of the two images in the overlapping area. Then I combined that with the original mosaic so that areas of high difference retained their color, while the unchanged areas faded to grey. This produces the following image:
Alternatively, the independent motion can be highlighted by running edge detection over a rather blurred version of the difference image (a high blur is needed to eliminate the small motions). That gives:
