| 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. |
