Multiple-Description Wavelet based Image Coding

Abstract--We consider the problem of coding images for transmission over error-prone channels. The impairments we target are transient channel shutdowns, as would occur in a packet network when a packet is lost, or in a wireless system during a deep fade: when data is delivered it is assumed to be error-free, but some of the data may never reach the receiver. The proposed algorithms are based on a combination of multiple description scalar quantizers with techniques successfully applied to the construction of some of the most efficient subband coders. A given image is encoded into multiple independent packets of roughly equal length. When packets are lost, the quality of the approximation computed at the receiver depends only on the number of packets received, but does not depend on exactly which packets are actually received. When compared with previously reported results on the performance of robust image coders based on multiple descriptions, on standard test images, our coders atta...

• Type: Conference
• Year: 1998
• Where: ICIP
• Authors: Sergio D. Servetto, Kannan Ramchandran, Vinay A. Vaishampayan, Klara Nahrstedt
• Keywords: Efficient Subband Coders, ICIP 1998, Image Processing, Multiple Descriptions, Multiple Independent Packets