Shape compression of moving objects using context-based arithmetic encoding

摘要

This paper deals with an approach to the compression of 2-D shape information. Specifically, the approach utilises a block-based context-based arithmetic encoding method to exploit both spatial and temporal redundancy in sequences of shapes. The method is shown to be highly efficient in comparative tests. In addition, it is demonstrated that context-based arithmetic encoding is easily extended for the coding of interlaced shape sources and for encoding any source in a scalable and/or error resilient manner. The application of the technique is in the compression of video object shapes within the framework of object-based video coding. The proposed algorithm is part of the MPEG-4 video specification.