Abstract-We present the unequal loss protection (ULP) framework in which unequal amounts of forward error correction are applied to progressive data to provide graceful degradation of image quality as packet losses increase. We develop a simple algorithm that can find a good assignment within the ULP framework. We use the Set Partitioning in Hierarchical Trees coder in this work, but our algorithm can protect any progressive compression scheme. In addition, we promote the use of a PMF of expected channel conditions so that our system can work with almost any model or estimate of packet losses. We find that when optimizing for an exponential packet loss model with a mean loss rate of 20% and using a total rate of 0.2 bits per pixel on the Lenna image, good image quality can be obtained even when 40% of transmitted packets are lost. Index Terms-Joint source/channel coding, lossy image transmission, lossy packet networks, packet erasure channel, packet loss, priority encoding transmission, Reed-Solomon coding, unequal loss protection.
In REF , the issue of image transmission over packet erasure channels was considered.
Unequal loss protection: graceful degradation of image quality over packet erasure channels through forward error correction
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
Computer Science