Motion vector quantization for efficient low-bit-rate video coding
Marco Cagnazzo, Marie Agostini, Marc Antonini, G. Laroche, Joël Jung · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2008
The most recent video coding standard H.264 achieves excellent compression performances at many different bit-rates. However, it has been noted that, at very high compression ratios, a large part of the available coding resources is only used to code motion vectors. This can lead to a suboptimal coding performance. This paper introduces a new coding mode for a H.264-based video coder, using quantized motion vector (QMV) to improve the management of the resource allocation between motion information and transform coeffcients. Several problems have to be faced with in order to get an efficient implementation of QMV techniques, yet encouraging results are reported in preliminary tests, allowing to improve the performances of H.264 at low bit-rates over several sequences.