A pipelined temporal difference imager
Gruev, V.; Etienne-Cummings, R.
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Volume 3, Issue , 2002 Page(s):683 - 686
Digital Object Identifier  
Summary:A 189×182 Active Pixel Sensor (APS) for temporal difference computation is presented. The temporal difference imager (TDI), fabricated in AMI 0.5 μ process, contains in-pixel storage elements for previous and current frames. A correlated double sampling circuit is used to suppress the fixed pattern noise on both images and direct difference on the corrected images is also computed. The pixel area occupies 25 μ by 25 μ, with fill factor of 30%. An efficient pipeline architecture for difference readout is implemented, allowing 8 bit precision of the difference imager and low temporal drop between the stored and current images. The chip consumes 30 mW at 50 fps from 5 V power supply

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