Post-processing Technique based on POCS for visual Enhancement

POCS를 이용한 효과적인 블록 현상 제거 기법

  • Kim, Yoon (Dept. of Electronics Engineering, Korea University) ;
  • Jung, Jae-Han (Dept. of Electronics Engineering, Korea University) ;
  • Kim, Jae-Won (Dept. of Electronics Engineering, Korea University) ;
  • Ko, Sung-Jea (Dept. of Electronics Engineering, Korea University)
  • 김윤 (고려대학교 전자공학과) ;
  • 정재한 (고려대학교 전자공학과) ;
  • 김재원 (고려대학교 전자공학과) ;
  • 고성제 (고려대학교 전자공학과)
  • Published : 2001.09.01

Abstract

In this paper. Ive propose a postprocessing technique based on the theory of projection on convex sets(POCS) to reduce the blocking artifacts in HDTV decoded images. In BDCT of HDTV. the image is divided into a grid of non-overlapped 8 ${\times}$ 8 blocks. and then each block is coded separately. A block which is located one pixel apart from the grid of BDCT will include the boundary of the original 8 ${\times}$ 8 block. If the blocking artifact is Introduced alone the block boundary. this block will have different frequency characteristic from that of the original block. Thus, a comparison of frequency characteristics of these two overlapping blocks can detect the undesired high-frequency components mainly caused by the blocking artifact. By eliminating these undesired high-frequency components adaptively, robust smoothing projection operator can be obtained. Simulation results with real image sequences indicate that the proposed method performs better than conventional algorithms.

Keywords