Kernel based sub-pixel motion estimation

Authors:
P. R. Hill;D. R. Bull
Affiliations:
Dept. of Electrical and Electronic Engineering, The University of Bristol, Bristol, UK;Dept. of Electrical and Electronic Engineering, The University of Bristol, Bristol, UK
Venue:
ICIP'09 Proceedings of the 16th IEEE international conference on Image processing
Year:
2009

Citing 2
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Abstract

Modern video codecs such as MPEG2, MPEG4-ASP and H.264 depend on computationally complex sub-pixel Motion Estimation (ME) to optimise rate-distortion efficiency. Sub-pixel ME is implemented within these standards using interpolated values at 1/2 or 1/4 pixel accuracy. This paper presents a novel scheme for sub-pixel ME using a model free kernel method utilising the result of the whole-pixel SAD distribution applied to an H.264 encoder. While giving an equivalent rate distortion performance, this approach approximately halves the number of quarter-pixel search positions giving an overall speed up of approximately 10% compared to the EPZS quarter-pixel method (the state of the art H.264 optimised sub-pixel motion estimator).