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2007
IEEE

A New Rotation Search for Dependent Rate-Distortion Optimization in Video Coding

9 years 7 months ago
A New Rotation Search for Dependent Rate-Distortion Optimization in Video Coding
We present a novel search algorithm which is suitable for optimizing functions with a high-dimensional discrete-valued parameter vector. The algorithm is designed to find a function local optimum with the minimal number of evaluated points without requiring function derivatives. The algorithm is applied to frame-level rate-distortion (R-D) optimization using Lagrangian relaxation to the rate constraints and to block motion estimation in H.264-based video coding. The R-D optimization is further accelerated by finding a good starting point by the golden section search. The results show excellent near-optimal R-D performance while computation is reduced by 99% compared to the quadratic coordinate-wise steepest descent algorithm. In motion estimation, the new algorithm requires 7-13% less checking points than the small diamond search algorithm with only a small penalty in prediction quality.
Tuukka Toivonen, Loren Merritt, Ville Ojansivu, Ja
Added 02 Jun 2010
Updated 02 Jun 2010
Type Conference
Year 2007
Where ICASSP
Authors Tuukka Toivonen, Loren Merritt, Ville Ojansivu, Janne Heikkilä
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