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Warped Discrete Cosine Transform-Based Low Bit-Rate Block Coding Using Image Downsampling

Author(s): Ertürk Sarp

Journal: EURASIP Journal on Advances in Signal Processing
ISSN 1687-6172

Volume: 2007;
Issue: 1;
Start page: 043948;
Date: 2007;
Original page

This paper presents warped discrete cosine transform (WDCT)-based low bit-rate block coding using image downsampling. While WDCT aims to improve the performance of conventional DCT by frequency warping, the WDCT has only been applicable to high bit-rate coding applications because of the overhead required to define the parameters of the warping filter. Recently, low bit-rate block coding based on image downsampling prior to block coding followed by upsampling after the decoding process is proposed to improve the compression performance for low bit-rate block coders. This paper demonstrates that a superior performance can be achieved if WDCT is used in conjunction with image downsampling-based block coding for low bit-rate applications.
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