João Ascenso
Fernando Pereira
ABSTRACT
Recently, several video coding solutions based on the distributed source coding paradigm have appeared in the literature. Among them, Wyner-Ziv video coding schemes enable to achieve a flexible distribution of the computational complexity between the encoder and decoder, promising to fulfill requirements of emerging applications such as visual sensor networks and wireless surveillance. To achieve a performance comparable to the predictive video coding solutions, it is necessary to increase the quality of the side information, this means the estimation of the original frame created at the decoder. In this paper, a hierarchical motion estimation (HME) technique using different scales and increasingly smaller block sizes is proposed to generate a more reliable estimation of the motion field. The HME technique is integrated in a well known motion compensated frame interpolation framework responsible for the creation of the side information in a Wyner-Ziv video decoder. The proposed technique enables to achieve improvements in the rate-distortion (RD) performance up to 7 dB when compared to H.263+ Intra and 3 dB when compared to H.264/AVC Intra.
- Ascenso, J., Brites, C., and Pereira, F. 2005. Improving Frame Interpolation with Spatial Motion Smoothing for Pixel Domain Distributed Video Coding. 5th EURASIP Conference on Speech and Image Processing, Multimedia Communications and Services (Smolenice, Slovak Republic, June 29 - July 02, 2005).Google Scholar
- Ascenso, J., Brites, C., and Pereira, F. 2006. Content Adaptive Wyner-Ziv Video Coding Driven by Motion Activity. IEEE International Conference on Image Processing (Atlanta, USA, October 08--11, 2006).Google Scholar
- Brites, C., Ascenso, J., and Pereira, F. 2006. Improving Transform Domain Wyner-Ziv Video Coding Performance. IEEE International Conf. on Acoustics, Speech and Signal Processing (Toulouse, France, May 14--19, 2006).Google Scholar
- Chien, W.-J., Karam, L. J., and Abousleman, G. P. 2006. Distributed video coding with 3D recursive search block matching. IEEE International Symposium on Circuits and Systems (Island of Kos, Greece, May 21--24, 2006).Google Scholar
- Information Technology, Coding of Audio-visual objects, Part 10: Advanced Video Coding, ISO/IEC Std. 14496-10, 2003.Google Scholar
- Klomp, S., Vatis, Y., and Ostermann, J. 2006. Side Information Interpolation with Sub-pel Motion Compensation for Wyner-Ziv decoder. International Conference on Signal Processing and Multimedia Applications (Setúbal, Portugal, August 7--10, 2006).Google Scholar
- "The DISCOVER codec evaluation", http://amalia.img.lx.it.pt/~discover/home.html.Google Scholar
Index Terms
- Hierarchical motion estimation for side information creation in Wyner-Ziv video coding
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