Robust transmission of compressed images over noisy Gaussian channels
Thomas P. O'Rourke, R.L. Stevenson, Yih-Fang Huang, Lance C. Pérez, Daniel J. Costello · 2002
The sensitivity of the compressed image representation to bit errors requires application of a channel code before transmission over noisy channels. To prevent the uncontrolled degradation caused by a channel error, an error controlling channel code is applied to the compressed representation before transmission. Many image communication systems have constraints on bandwidth, power and time which prohibit transmission of uncompressed raw image data. Compressed image formats, however, are extremely sensitive to bit errors which can seriously degrade the quality of the image at the receiver. A new list-based iterative trellis decoder is proposed which accepts feedback from a post-processor which can detect channel errors in the reconstructed image. Experimental results are shown which indicate the new decoder provides significant improvement over the standard Viterbi decoder.