Index Terms-CMOS image sensor, computation-on-readout (COR), delta-difference sampling (DDS), pixel-level analog-to-digital conversion (ADC), temporal difference imager.

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Abstract-A video sensor platform consisting of a smart image sensor with focal plane motion processing is presented. The camera node is intended for ultra-low bandwidth ad-hoc wireless networks with data rates of less than 2kB/sec. To meet the targets of low power consumption and low complexity, the CMOS image sensor (consuming 4.2mW of power at 30fps) autonomously monitors for scene changes, outputting full image data only when relevant. For this sensor node, several different operating configurations leveraging the analog processing and storage capability of the imager, including a full motion DCT based video compression algorithm are shown. The entire sensor module can operate from 3 AA batteries and consumes 225mW at full operation.

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Abstract-An image sensor with focal plane based hardware acceleration of video compression is presented. The 90×90 pixel CMOS image sensor provides in-pixel processing of intensity changes, serving as an analog memory and processor for temporal image difference computation. Surveillance quality videos of up to a 48:1 compression ratio via a temporally compensated DCT based compression algorithm is attained with just an 18.5 MHz micro-controller. Power consumption is 225mW during full operation and 6mW during a sleep mode that continuously monitors for change events to trigger encoding.