Channel Error Propagation In Predictor Adaptive Differential Pulse Code Modulation (DPCM) Coders

Venkat Devarajan; K. R. Rao

doi:10.1117/12.959404

11 November 1980 Channel Error Propagation In Predictor Adaptive Differential Pulse Code Modulation (DPCM) Coders

Venkat Devarajan, K. R. Rao

Proceedings Volume 0249, Advances in Image Transmission II; (1980) https://doi.org/10.1117/12.959404
Event: 24th Annual Technical Symposium, 1980, San Diego, United States

Abstract

New adaptive differential pulse code modulation (ADPCM) coders with adaptive prediction are proposed and compared with existing non-adaptive DPCM coders, for processing composite National Television System Commission (NTSC) television signals. Comparisons are based on quantitative criteria as well as subjective evaluation of the processed still frames. The performance of the proposed predictors is shown to be independent of well-designed quantizers and better than existing predictors in such critical regions of the pictures as edges ind contours. Test data consists of four color images with varying levels of activity, color and detail. The adaptive predictors, however, are sensitive to channel errors. Propagation of transmission noise is dependent on the type of prediction and on location of noise i.e., whether in an uniform region or in an active region. The transmission error propagation for different predictors is investigated. By introducing leak in predictor output and/or predictor function it is shown that this propagation can be significantly reduced. The combination predictors not only attenuate and/or terminate the channel error propagation but also improve the predictor performance based on quantitative evaluation such as essential peak value and mean square error between the original and reconstructed images.

Citation Download Citation

Venkat Devarajan and K. R. Rao "Channel Error Propagation In Predictor Adaptive Differential Pulse Code Modulation (DPCM) Coders", Proc. SPIE 0249, Advances in Image Transmission II, (11 November 1980); https://doi.org/10.1117/12.959404

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