2007 IEEE International Conference on Image Processing - San Antonio, Texas, U.S.A. - September 16-19, 2007

Technical Program

Paper Detail

Paper:TA-L1.1
Session:Distributed Source Coding II: Distributed Image and Video Coding and Their Applications
Time:Tuesday, September 18, 09:50 - 10:10
Presentation: Special Session Lecture
Title: ANALYSIS OF CODING EFFICIENCY OF MOTION-COMPENSATED INTERPOLATION AT THE DECODER IN DISTRIBUTED VIDEO CODING
Authors: Marco Tagliasacchi; Politecnico di Milano 
 Laura Frigerio; Politecnico di Milano 
 Stefano Tubaro; Politecnico di Milano 
Abstract: This paper analyzes the coding efficiency of distributed video coding (DVC) schemes that perform motion-compensated interpolation at the decoder. The decoder has access only to the key frames when generating the side information for intermediate frames. This fact introduces a displacement estimation error that depends on several factors: 1) the overall motion complexity; 2) the temporal coherence of the motion field; 3) the temporal distance between successive key frames. Adopting a state-space model and a Kalman filtering framework, we obtain an estimate of the displacement error variance. This is used to determine the rate-distortion function of the overall coding scheme, that takes into account both intra-coded key frames and DVC-coded frames. The proposed model shows that motion-compensated interpolation is unable to achieve the coding efficiency of conventional motion-compensated predictive coding.



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