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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2008 E91-A(3):740-748; doi:10.1093/ietfec/e91-a.3.740
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Signal Processing for Audio and Visual Systems and Its Implementations -- Papers -- Image Coding and Video Coding

Improved Fading Scheme for Spatio-Temporal Error Concealment in Video Transmission

Min-Cheol HWANG1, Jun-Hyung KIM1, Chun-Su PARK1 and Sung-Jea KO1

1 The authors are with the Department of Electronic Engineering, Korea University, Anam-Dong, Sungbuk-Gu, Seoul 136-701, Korea. E-mail: sjko{at}korea.ac.kr


  Abstract

Error concealment at a decoder is an efficient method to reduce the degradation of visual quality caused by channel errors. In this paper, we propose a novel spatio-temporal error concealment algorithm based on the spatial-temporal fading (STF) scheme which has been recently introduced. Although STF achieves good performance for the error concealment, several drawbacks including blurring still remain in the concealed blocks. To alleviate these drawbacks, in the proposed method, hybrid approaches with adaptive weights are proposed. First, the boundary matching algorithm and the decoder motion vector estimation which are well-known temporal error concealment methods are adaptively combined to compensate for the defect of each other. Then, an edge preserved method is utilized to reduce the blurring effects caused by the bilinear interpolation for spatial error concealment. Finally, two concealed results obtained by the hybrid spatial and temporal error concealment are pixel-wisely blended with adaptive weights. Experimental results exhibit that the proposed method outperforms conventional methods including STF in terms of the PSNR performance as well as subjective visual quality, and the computational complexity of the proposed method is similar to that of STF.

Key Words: error concealment, video transmission, video restoration, hybrid approach, fading scheme

Manuscript received July 9, 2007. Manuscript revised October 19, 2007.


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