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A DISCRETE WAVELET TRANSFORM – SINGULAR VALUE DECOMPOSITION SYSTEM FOR IMAGE CODING

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Author(s): H. de Jesús Ochoa-Domínguez, | K. R. Rao

Journal: Journal of Applied Research and Technology
ISSN 1665-6423

Volume: 5;
Issue: 2;
Start page: 121;
Date: 2007;
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Keywords: Wavelet Transform | Singular Value Decomposition | HC-RIOT | SPIHT | Scalar Quantization | Vector Quantization | Image Coding | HDCTSVD.

ABSTRACT
A system that combines techniques of wavelet transform (DWT) and singular value decomposition (SVD) toencode images is presented. The image is divided into tiles or blocks of 64x64 pixels. The decision criterionas to which transform to use is based on the standard deviation of the 8x8 pixel subblocks of the tile toencode. A successive approximation quantizer is used to encode the subbands and vector quantization/scalarquantization is used to encode the SVD eigenvectors/eigenvalues, respectively. For coding color images, theRGB components are transformed into YCbCr before encoding in 4:2:0 format. Results show that theproposed system outperforms the JPEG and approaches the JPEG2000.
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