1. A system comprising: at least one sensor for detecting at least one of object occlusion or drift in visual data; and a digital signal processor coupled with the at least one sensor, the digital signal processor having at least one database (DB) including target template sets for analyzing both object occlusion in visual data and drift in visual data, wherein the digital signal processor is configured to switch between one of the target template sets and a distinct target template set in the at least one DB based upon detection of the at least one of object occlusion or drift in the visual data.