I have a webcam taking a photo every minute. Most of the time, there is nothing happening, so I end up with thousands of thousands of near identical photos. How can I find the photos where something actually happened?
Note the lighting may vary somewhat between photos. This should be ignored, I only want to find the photos where something actually changed or moved. These 'interesting' photos should be highlighted in some way, maybe copied to a different folder. And then some way of filtering out or bulk deleting the rest of the photos.
The software should run on Windows 7, and free of charge. Bonus if it is also free/open source.