14 October 1987 An Adaptive Classification Procedure For Transform Coding Of Image Sequences
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Proceedings Volume 0804, Advances in Image Processing; (1987) https://doi.org/10.1117/12.941334
Event: Fourth International Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, The Hague, Netherlands
A classification method for adaptive scalar quantization and efficient encoding of the DCT coefficients of video phone signals is described. In a corresponding coder concept using hybrid vector and scalar quantization the vector quantization (VQ) stage is not only used as an efficient prequantization method but also as a classifier for zonal coding by the following adaptive scalar quantization and encoding stage. To optimize the coder per-formance, the VQ classification result is combined with the output of an energy-based classifier. Our simulation results indicate that in 61 kbit/s encoding applications this concept improves the signal-to-noise-ratio by up to 0.8 dB with regard to a pure energy-based classification method.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Herbert Holzlwimmer, Herbert Holzlwimmer, Bernard Hammer, Bernard Hammer, } "An Adaptive Classification Procedure For Transform Coding Of Image Sequences", Proc. SPIE 0804, Advances in Image Processing, (14 October 1987); doi: 10.1117/12.941334; https://doi.org/10.1117/12.941334

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