Abstract:- This paper presents a sublinear, parallel, split-merge block matching, displacement estimation algorithm for video coding that performs a segmentation of the frames into superblocks. All the superblocks are uniquely labelled and each of the processors knows the label of the superblock to which it belongs. The algorithm identifies the borders of the superblocks and labels each of them with the ID of the smallest-ID processor in the area. The processors having their IDs equal to their labels will participate to the SEND phase, in which the output is sent to the destination. The computation involved takes time proportional to log(n), where n is the number of blocks. The algorithm makes use of the techniques for image labelling on an optical architecture described by Eshaghian in [9], it operates on a parallel architecture with optical connections through free space, or equivalently, on a PRAM
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