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A CMOS imager with real-time frame differencing and centroid computation

We present a novel imager that computes real-time frame difference as well as several image statistics. We desire to use a network of these imagers connected to microprocessors for computation on images. To reduce the bandwidth to the processors, each imager has on-chip computation to determine relevant information and sends only that to the microprocessors. We have developed an imager that uses simple analog elements to implement the desired functions. We present experimental results.