| Paper: | IMDSP-P7.10 | ||
| Session: | Video Coding I | ||
| Time: | Wednesday, May 17, 14:00 - 16:00 | ||
| Presentation: | Poster | ||
| Topic: | Image and Multidimensional Signal Processing: Video Coding | ||
| Title: | Modeling the Motion Coding Error for MCWT Video Coders | ||
| Authors: | Marie Andrée Agostini, Thomas André, Marc Antonini, Michel Barlaud, I3S Laboratory / CNRS / University of Nice-Sophia Antipolis, France | ||
| Abstract: | In motion-compensated wavelet based video coders, a very precise motion estimation is necessary. However, a motion vectors field of high precision is expensive in binary resources and requires a great place in the bitstream compared to the wavelet coefficients. Thus, we need to reduce the cost of the motion information. To this end, we propose an approach based on a scalable lossy coding of high-precision motion vectors. It allows to optimize the trade-off between motion bit-rate and wavelet coefficients bit-rate, strongly reduces the motion cost, and thus, increases the coder performances at low bit-rate. Obviously, this lossy motion coding has an impact on the decoded sequence. In this paper, we evaluate this impact by establishing a theoretical distortion model for the motion coding error. This model will allow to realize an optimal model-based bit-rate allocation between wavelet subbands and motion vectors. The experimental validation of the model gives promising results. | ||
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