Warped discrete cosine transform-based low bit-rate block coding using image downsampling

Authors:
Sarp Ertürk
Affiliations:
Kocaeli University Laboratory of Image and Signal Processing (KULIS), Electronics and Telecommunication Engineering Department, University of Kocaeli, Kocaeli, Turkey
Venue:
EURASIP Journal on Applied Signal Processing
Year:
2007

Citing 5
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Abstract

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.