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Proceedings Paper

Subband coding of prediction error images using constrained-storage VQ
Author(s): Christoph Stiller; Olaf Hirsch
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Paper Abstract

A subband coding scheme for the prediction error in a hybrid coder at a rate of 8 kbit/s is presented. In order to achieve small address overhead we propose intraband encoding of rectangular shaped regions. An iterative procedure of relaxation type which jointly considers all subbands determines number, size, and position of updated rectangles. It is driven by optimization of the coding-gain per bit ratio. The prediction error amplitudes within the selected rectangles compose vectors of different dimensions. They are quantized by a multi codebook vector quantizer which contains one codebook per vector dimension. The problem of large storage requirement of multi codebook vector quantizers is circumvented by a codebook sharing approach. A training procedure for the constrained-storage VQ is presented. In terms of SNR it performs less than 0.5 dB worse than a common multi codebook VQ while saving 90% storage.

Paper Details

Date Published: 12 January 1993
PDF: 10 pages
Proc. SPIE 1771, Applications of Digital Image Processing XV, (12 January 1993); doi: 10.1117/12.139089
Show Author Affiliations
Christoph Stiller, Aachen Univ. of Technology and Philips Kommunikations Industrie AG (Germany)
Olaf Hirsch, Aachen Univ. of Technology and Philips Kommunikations Industrie AG (Germany)


Published in SPIE Proceedings Vol. 1771:
Applications of Digital Image Processing XV
Andrew G. Tescher, Editor(s)

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