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In applications of object-based video compres­ sion, one of the most efficient strategies for lossless coding of object shapes is the differential chain coder (DCC). In this paper, several modifications of a DCC are identified and ana­ lyzed with the purpose of improving its efficiency. The num­ ber of spatial prediction classes in a conditional DCC was in­ creased. In addition, we explored in a more effective and in­ tegrated form, the spatial and temporal correlations between pixels of the object contour. As compared to the methods available in the literature, the modifications that provided the highest compaction of the shape information were incorpo­ rated to the three schemes proposed in this paper: the adap­ tive conditional DCC, the DCC conditioned to the current frame and the DCC conditioned to the previous frame. In all cases, we have also considered the effects of different choices for the table of the Huffman codes, over the final compression rate.

Codificação de Cadeia Eficientes para Compactação da Informação de Forma em Compressão de Vídeo Baseada em Objetos