Robust subband image coding for waveform channels with optimum power- and bandwidth- allocation
John M. Lervik, T.R. Fischer · 2002
Image coding for power- and bandwidth-limited continuous-amplitude channels is considered. We address the problem of power- and bandwidth- allocation for subband image coding where the goal is to minimize the overall end-to-end distortion. The decomposed image is modeled as a composite source, and an algorithm for allocating power and bandwidth among the subsources of this source is proposed. The algorithm is used to compute estimates of the optimum performance theoretically attainable (OPTA) for subband image communication over a power- and bandwidth-limited AWGN channel. A gracefully degrading subband image coder with dynamic power- and bandwidth allocation is simulated and the performance compared to OPTA and to results of other schemes for robust image communication.