A video-based human, non-human, and/or motion verification system and method may include a video sensor adapted to obtain video and produce video output. The video sensor may include a video camera. The video-based human verification system may further include a processor adapted to process video to...http://www.google.com.tw/patents/US20070002141?utm_source=gb-gplus-share專利 US20070002141 - Video-based human, non-human, and/or motion verification system and method
