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Title of Journal: SIViP

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Abbravation: Signal, Image and Video Processing

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Springer London

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DOI

10.1007/s11139-007-9036-6

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ISSN

1863-1711

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Fast algorithms for designing nearly optimal looku

Authors: Rahul Vanam Eve A Riskin Richard E Ladner Sheila S Hemami
Publish Date: 2012/02/01
Volume: 7, Issue: 5, Pages: 991-1003
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Abstract

The H264/AVC standard significantly improves video compression performance over earlier standards at the cost of increased complexity In this paper we present two offline algorithms for generating a lookup table of parameter settings that can be used by a complexity control algorithm for controlling the speed of the H264 encoder Our algorithms to design the lookup table of parameter settings take fewer than 2 of the number of encodings required by an exhaustive search of all possible parameter settings and find parameter settings that offer high peak signaltonoise ratio PSNR with low encoding time at a given bitrate Our parameter settings are fairly robust over different videos and bitrates We focus on lowresolution videos at bitrates less than 300 kb/s We compare the performance of our algorithms to both exhaustive search and a multiobjective optimization algorithm Our parameter settings improve the average encoding speed over the default parameter setting of the x264 encoder on both PC and cell phone platforms by up to 374 and 941 respectively with PSNR difference of up to 03 dBThis work is supported by National Science Foundation under grant numbers CCF0514353 CCF0514357 and IIS0811884 Preliminary versions of this work appeared in the IEEE Data Compression Conference 2007 and IEEE Data Compression Conference 2009 The first author performed this work while at the University of Washington

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