Summary
International Technical Conference on Circuits/Systems, Computers and Communications
2008
Session Number:P1
Session:
Number:P1-68
Design of a De-Ringing Filter for Wavelet-Based Compressed Image
Yen-Yu Chen, Ying-Wen Chang, Wen-Chien Yen,
pp.-
Publication Date:2008/7/7
Online ISSN:2188-5079
Summary:
JPEG2000 Standard is a new generation image compression technique, enabling encoding images at low bit-rates with acceptable quality. Since JPEG2000 is based on wavelet transforms, the reconstructed image will contain perceivable ringing artifacts in medium and low bit-rate regimes of lossy compression. This work utilizes a quad-tree partitioning scheme for post-processing the reconstructed image in a spatially varying manner and presents a voting strategy to determine a set of morphological filters to be used for reducing the ringing artifacts. Simulation results demonstrate that the proposed technique enhances reconstructed image quality compared to unprocessed JPEG2000 output at an equivalent bit-rate accounting for the side-information overhead, in terms of both Peak Signal-to-Noise Ratio (PSNR) and Visible Ringing Measure (VRM).