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Performance of reference block updating techniques when tracking with the block matching algorithm

An important problem when using the block matching algorithm to track objects is how to update the reference block to take account of the changing target appearance. This paper investigates and reports on the accuracy and stability of a variety of update strategies and on the robustness of these strategies to image noise. These strategies are applicable where an object is being tracked using the block matching algorithm over an extended period of time or where the object appearance is changing over time.