Ms. Xiaohuan Li Profile

Xiaohuan Li

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Proceedings Article | 14 March 2005 Paper

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

Xiaohuan Li, Joel Jackson, Aggelos Katsaggelos, Russel Merserau

Proceedings Volume 5685, (2005) https://doi.org/10.1117/12.587328

KEYWORDS: Affine motion model, Motion models, Motion estimation, Video, Molybdenum, Distortion, Computer programming, Video coding, Image segmentation, Quantization

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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.

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