This manual describes the step-by-step construction of a PupilCam pupil-detecting camera. The PupilCam uses a simple structured lighting scheme that synchronizes the illumination of two sets of near-IR LEDs to the field rate of a B&W NTSC board camera. The resulting video output is standard NTSC with the destinction that pupils in the first/odd field will appear bright and the same pupils in the second/even field will appear dark. A simple differencing operation reveals the location of pupils in the video image.
By: David Koons
Published in: RJ10212 in 2001
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