Integrating Temporal and Spatial Domain Error Concealment Algorithms for Video Transmission

• Main Authors: Tzung-Shian Lee, 李宗憲
• Other Authors: Shaou-Gang Miaou
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/55487392581664803910

碩士 === 中原大學 === 電子工程研究所 === 90 === Digital video transmission turns to wireless communication application with rapid technology development. The compressed video data are easily corrupted by channel interference. Error concealment is a technique used at the decoder side for improving decoded video quality without any increase of transmission data or channel bandwidth. Error concealment techniques can be classified into temporal and spatial domains by their error recovery principles, and each of them has its own trait and application condition. Thus, how to integrate the methods of both domains and make use of their advantages to improve image quality become a major research topic in recent error concealment study. In this thesis, an error concealment scheme combining temporal and spatial domains algorithms is proposed. According to the matching degree of motion vectors, a macroblock in error is divided into several areas. Any areas suitable for the temporal-domain boundary matching method are recovered first. The remaining areas are recovered by improved spatial-domain nearest pixels interpolation method. The simulation results show that the proposed method is 0.05-1.91 dB better than BMA (Boundary Matching Algorithm) and MBMA (Modified Boundary Matching Algorithm) on the average in terms of peak signal to noise ratio (PSNR) without increasing too much computational complexity. Overall, the temporal and spatial domain combining error concealment algorithms work well in the macroblocks with different objects or some boundary between objects and background.