Enhancement of Wavelet-coded Image by Directional Filtering
Byong-Seok Min, Seung‐Jong Kim, Dong-Kyun Lim · Journal of the Korea Academia-Industrial cooperation Society · 2007
In many multimedia applications, image compression is required to substantially reduce the amount of image data. This compression, however, sometimes brings artifacts. Typical artifacts are blocking artifacts and mosquito noise in DCT-coded images, and ringing artifacts around edges in wavelet-coded images. We propose a new directional postprocessing algorithm, which includes detection of the edge direction, interpolation scheme, and directional nonlinear filtering, to enhance the quality of decoded images. Simulation results show that the proposed algorithm is as effective as or more effective than other nonlinear filtering techniques