Multiple global affine motion model for H.264 video coding with low bit rate

Xiaohuan Li; Joel R. Jackson; Aggelos K. Katsaggelos; Russel M. Merserau

doi:10.1117/12.587328

14 March 2005 Multiple global affine motion model for H.264 video coding with low bit rate

Xiaohuan Li, Joel R. Jackson, Aggelos K. Katsaggelos, Russel M. Merserau

Proceedings Volume 5685, Image and Video Communications and Processing 2005; (2005) https://doi.org/10.1117/12.587328
Event: Electronic Imaging 2005, 2005, San Jose, California, United States

Abstract

A multiple global affine motion model is proposed for low bit rate video compression. Block-wise motion segmentation is first performed with the number of motion objects L predefined. The affine motion models for multiple MOs are estimated and coded in the frame header. The scaling parameters a1, a2, a4 and a5 are coded with a 4-dimensional vector-quantizer (VQ), whose 16 most recently used code words are maintained on line and searched for VQ match, and the 300-word long main code book stored offline. The translational parameters a3 and a6 are coded predicatively as a classical motion vector. L new macro-block modes are added to the standard’s list of 7 intra and inter modes. No segmentation information is transmitted, for the mode already indicates that if one of the affine modes is selected by Lagrange rate-distortion optimization. A metric S is defined to measure locality of the motion and will disable use of affine models when a threshold is surpassed. Simulation shows that more than 50% of the MB’s choose one of the affine modes. When 100kbps or lower bandwidths are available, the proposed codec not only saves 1~18% bit rate, but also enhances error-resilience in multiple slice frames and reduces blocking artifacts notably.

Citation Download Citation

Xiaohuan Li, Joel R. Jackson, Aggelos K. Katsaggelos, and Russel M. Merserau "Multiple global affine motion model for H.264 video coding with low bit rate", Proc. SPIE 5685, Image and Video Communications and Processing 2005, (14 March 2005); https://doi.org/10.1117/12.587328

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