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Low bandwidth fractional motion estimation in H.264 design for mobile devices

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2 Author(s)
Jeong Hoon Kim ; Sch. of Electr. Eng. & Comput. Sci., Kyungpook Nat. Univ., Daegu, South Korea ; Jun Rim Choi

The conventional fractional motion estimation(FME) approach needs a two-step interpolation for half-pel and quarter-pel refinements. Though two-sequential-step brings high encoding performance, it introduces a huge computational load and memory bandwidth requirement for searching seventeen fractional points for each of the forty-one motion vectors. These obstacles become more difficult when running the applications on mobile device with the limitation of power and hardware resource. In this paper, a low bandwidth FME design is proposed with two techniques. Based on high correlation between motion vector of a block and its up-layer as well as relationship of integer candidates, one-step FME algorithm is proposed to reduce computation complexity and memory bandwidth requirement. In addition, a memory saving scheme is proposed while carefully considering the trade-off between hardware resource and memory saving. Experimental results show that the proposed design just needs 66% of gate counts and saves 88% of memory bandwidth when compared with previous design.

Published in:

Circuits and Systems (MWSCAS), 2011 IEEE 54th International Midwest Symposium on

Date of Conference:

7-10 Aug. 2011