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what kind of approach can be used for recognize hand signs?

what approach is used in the below video to recognition for hand signs?

why is he using cvblob? how did he separate his head from hand ( it has different colors) how to actually train the signs using the SVM ? how much time will it consume ?

what kind of approach can be used for recognize hand signs?

what approach is used in the below video to recognition for hand signs?

Sign Language recognition

why is he using cvblob? how did he separate his head from hand ( it has different colors) how to actually train the signs using the SVM ? how much time will it consume ?

Edit:My questions

how to recognize signs used in a sign language ? do we need store the signs as files in a Haar-like database? is it possible?
if we skin color recognition is used ? how to identify the signs?