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http://dx.doi.org/10.3745/KIPSTB.2005.12B.7.755

Recovery of Missing Motion Vectors Using Modified ALA Clustering Algorithm  

Son, Nam-Rye (전남대학교 전산학과)
Lee, Guee-Sang (전남대학교 정보통신연구소 컴퓨터정보학부)
Publication Information
The KIPS Transactions:PartB / v.12B, no.7, 2005 , pp. 755-760 More about this Journal
Abstract
To transmit a video bit stream over low bandwith, such as mobile, channels, encoding algorithms for high bit rate like H.263+ are used. In transmitting video bit-streams, packet losses cause severe degradation in image quality. This paper proposes a new algorithm for the recovery of missing or erroneous motion vectors when H.263+ bit-stream is transmitted. Considering that the missing or erroneous motion vectors are closely related with those of neighboring blocks, this paper proposes a temporal-spatial error concealment algorithm. The proposed approach is that missing or erroneous Motion Vectors(MVs) are recovered by clustering the movements of neighboring blocks by their homogeneity. MVs of neighboring blocks we clustered according to ALA(Average Linkage Algorithm) clustering and a representative value for each cluster is determined to obtain the candidate MV set. By computing the distortion of the candidates, a MV with the minimum distortion is selected. Experimental results show that the proposed algorithm exhibits better performance in subjective and objective evaluation than existing methods.
Keywords
H.263; Error Recovery; Error Concealment; Motion Vector; Boundary Matching Algorithm; ALA(Average Linkage Algorithm);
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