Web-based video capture and detection using web cam

to anyone:
is it possible to capture video and detect motion using a web cam in a web based application?how is it done?
if not possible, what solutions can you suggest so that i can put it on a web based application?
tnx for the help..

Ironman wrote:
I'm sure it could be achieved by capturing individual frames, say one every second or so, and then doing a checksum on the image bytes and compare it with the previous frames checksum - if they were different then the frames are different and therefore motion can be assumed. If you don't want to check the entire image you can choose a tile, say in the centre of the picture, and checksum this. I use this technique to detect frozen images if CCTV cameras are causing problems. This other thread may also help :
http://forum.java.sun.com/thread.jspa?threadID=5233760
Wow, now that is good idea. I guess you don't need external hardware to check for movement. Brilliant!

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