Wavelet Coding of Video Object by Object-based Speck Algorithm

In this paper, we present the OB-SPECK algorithm (objectbased set partitionedembedded block coder) for wavelet coding of arbitrary shaped video objects. Based on the SPECK algorithmintroduced in [1], the shape informationof the video object in the wavelet domain is integrated into the coding process for efficient coding of a video object of arbitrary shape. The whole coding system is a motion prediction coding system. First, the object in inter frame is predicted by the blockbased motion estimation and compensation; then the video object (in intra frame) and motion residue (in inter frame) are transformed by the object-based wavelet transform, which applies a proper sampling method so that the number of wavelet coefficients is the same as that of the original object and the spatial correlation within the object is preserved. Finally, the wavelet coefficients are encoded by the OB-SPECK algorithm. The proposed scheme achieves high coding efficiency and preserves the features of an embedded bitstream, low computational complexity and exact bitrate control.