Geometric-structure-based error concealment with novel applications in block-based low-bit-rate coding

This paper first proposes a computationally efficient spatial directional i nterpolation scheme, which makes use of the local geometric information ext racted from the surrounding blocks. The proposed error-concealment scheme p roduces results that are superior to those of other approaches, in terms of both peak signal-to-noise ratio and visual quality. Then a novel approach that incorporates this directional spatial interpolation at the receiver is proposed for block-based low-bit-rate coding. The key observation is that the directional spatial interpolation at the receiver can reconstruct faith fully a large percentage of the blocks that are intentionally not sent: A r ate-distortion optimal way to drop the blocks is shown. The new approach ca n be made compatible with standard JPEG and MPEG decoders. The block-droppi ng approach also has an important application for dynamic rate shaping in t ransmitting precompressed videos over channels of dynamic bandwidth. Experi mental results show that the proposed coding and rate-shaping systems can p rovide significant subjective and objective gains ol er conventional approa ches.