Adaptive Hybrid Coding Of Images

Ali Habibi

doi:10.1117/12.958251

28 December 1979 Adaptive Hybrid Coding Of Images

Ali Habibi

Proceedings Volume 0207, Applications of Digital Image Processing III; (1979) https://doi.org/10.1117/12.958251
Event: 23rd Annual Technical Symposium, 1979, San Diego, United States

Abstract

In Hybrid Coding technique, the sampled data is divided into blocks of NXM samples. Next, each block is transformed to generate a one-dimensional transform of each line in the block. The transform coefficients are then processed by a block of DPCM encoders which uncorrelate the data in the second dimension and quantize the uncorrelated samples using appropriate quantizers. In this study an adaptive Hybrid Coding technique is proposed based on using a single quantizer (A/D Converter) to quantize the transform coefficients and using a variable-rate algorithm for coding the quantized coefficients. The accuracy of the A/D converter (number of bits per sample) determines the fidelity of the system. The buffer-control algorithm controls the accuracy of the A/D converter for each block resulting in a fixed-rate encoder system. Experimental results have shown a stable buffer condition and reconstructed images with a higher fidelity than nonadaptive Hybrid systems.

Citation Download Citation

Ali Habibi "Adaptive Hybrid Coding Of Images", Proc. SPIE 0207, Applications of Digital Image Processing III, (28 December 1979); https://doi.org/10.1117/12.958251

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