Image comparison techniques
Posted on 2009-04-01
I'm trying to develop an application that will detect objects inside a picture. The objects that I'm trying to detect are also moving, so I've tried a technique where I sample every 100ms and XOR the old and new pictures and unchanged pixels become black. I didn't have too much success doing this...
I've also tried searching through the 100ms samples for the images I'm trying to detect, this technique is obviously slow. I've tried to optimize it by stepping 3 pixels, but it still takes around 150ms to process the image.
Are there any techniques I can use? Fortunately, noise isn't really an issue in the images as they are computer generated images (it's a video game).