Post Filtering for Cell Loss Concealment in Packet Video

Kou-Hu Tzou

doi:10.1117/12.970172

1 November 1989 Post Filtering for Cell Loss Concealment in Packet Video

Kou-Hu Tzou

Proceedings Volume 1199, Visual Communications and Image Processing IV; (1989) https://doi.org/10.1117/12.970172
Event: 1989 Symposium on Visual Communications, Image Processing, and Intelligent Robotics Systems, 1989, Philadelphia, PA, United States

Abstract

A packet network provides an effective way of multiplexing variable-rate sources, such as video and voice, by taking into account the source statistics. However, network congestion will result in packet (cell) losses which may substantially degrade video quality. In this paper, we investigate the effects of cell losses on a Lapped Orthogonal Transform (LOT) coding system and methods to restore the degraded image. Due to the overlapping nature of the LOT, an image block can be partially reconstructed if the corresponding coefficient block is missing. The degraded image block is modeled as a blurred original block corrupted by a correlated noise. A minimum mean-squared-error restoration filter is designed using a first-order Markov model for the image. The restored image shows noticeable quality improvement.

Citation Download Citation

Kou-Hu Tzou "Post Filtering for Cell Loss Concealment in Packet Video", Proc. SPIE 1199, Visual Communications and Image Processing IV, (1 November 1989); https://doi.org/10.1117/12.970172

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