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.© (1989) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.