A mixed signal enhanced WTA tracking system via 2-D dynamic element matching

An approach for implementing a two dimensional dynamic element matching (DEM) technique for enhancement of a mixed signal WTA tracking system is shown to be achievable. The system consists of a version of a commonly used winner-take-all (WTA) for brightest object tracking, which is traditionally implemented as an analog circuit and suitable for integration with CMOS Active Pixel Sensors (APS). It rapidly outputs the location of the most salient object in the field of view for tracking and navigation purposes. In this WTA version, the DEM technique has been employed for compensating the matching problems of the APS and WTA, as well as compensating for errors in location of objects with finite dimensions. This system contains an analog part together with a control module implemented as a digital circuit. This digital part enables a high level of flexibility in implementing various processing functions. System operation is discussed and simulation results are reported