Here’s a simple motion detection utility that you can use to do motion detection on a webcam, or video, or any other component in your Flex application. It uses a bitmap technique to compare image snapshots and calculate the number of pixels that were changed between snapshots. This gives you a percentage of the total pixels that were changed, which is a crude way to figure out motion. Basically what you do is draw one frame onto the previous frame using the “difference” blend mode. Then you threshold the image and you can figure out the number of pixels that had any change.

See the full example after the jump.
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