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


Erturk S.

EURASIP JOURNAL ON ADVANCES IN SIGNAL PROCESSING, 2007 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume:
  • Publication Date: 2007
  • Doi Number: 10.1155/2007/43948
  • Title of Journal : EURASIP JOURNAL ON ADVANCES IN SIGNAL PROCESSING

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.