MIT-Harvard graduate student Ming-Zher Poh has demonstrated a system that can extract accurate pulse measurements from ordinary low-resolution webcam imagery.
The system measures slight variations in brightness produced by the flow of blood through blood vessels in the face. Public-domain software is used to identify the position of the face in the image, and then the digital information from this area is broken down into the separate red, green and blue portions of the video image.
Reference: http://bit.ly/cVWwc6
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