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Proceedings Paper

A hybrid DWT-SVD image-coding system (HDWTSVD) for monochromatic images
Author(s): Humberto Ochoa; K. R. Rao
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Paper Abstract

In this paper, we propose a new low bitrate system to encode monochromatic images that combines DWT and SVD techniques. At the encoder side, the input image is divided into blocks (tiles) of 64×64 pixels. A criterion based on the average standard deviation of 8×8 subblocks is used to choose DWT or SVD. If the tile exhibits a high average standard deviation, it is compressed by using SVD otherwise by DWT. Eigenvalues and eigenvectors are scalar and vector quantized respectively. The Daubechies 9/7 filter bank factored into lifting steps is used for the DWT. The maximum number of levels of subband decomposition for each tile is 3. Each subband is coded using the HC-RIOT. At the decoder side, the header of each compressed tile is read and the information is sent to the HC-RIOT decoder or to the inverse quantization, in order to recover the tile. The proposed system is applied to image coding and its performance is discussed.

Paper Details

Date Published: 7 May 2003
PDF: 11 pages
Proc. SPIE 5022, Image and Video Communications and Processing 2003, (7 May 2003); doi: 10.1117/12.476715
Show Author Affiliations
Humberto Ochoa, Univ. of Texas at Arlington (United States)
Univ. Autonama de Cd. Juarez (Mexico)
K. R. Rao, Univ. of Texas at Arlington (United States)

Published in SPIE Proceedings Vol. 5022:
Image and Video Communications and Processing 2003
Bhaskaran Vasudev; T. Russell Hsing; Andrew G. Tescher; Touradj Ebrahimi, Editor(s)

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