Fast inter-mode decision in an H.264/AVC encoder using mode and Lagrangian cost correlation

  • Authors:

  • Song-Hak Ri;Yuri Vatis;Joern Ostermann

  • Affiliations:

  • Institut für Informationsverarbeitung, Leibniz Universität, Hannover, Germany;Institut für Informationsverarbeitung, Leibniz Universität, Hannover, Germany;Institut für Informationsverarbeitung, Leibniz Universität, Hannover, Germany

  • Venue:
  • IEEE Transactions on Circuits and Systems for Video Technology
  • Year:
  • 2009

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Abstract

In this paper we present a novel algorithm to speed up the inter-mode decision process for the H.264/AVC encoding. The proposed inter-mode decision scheme determines the best coding mode of a given macroblock (MB) by predicting the best mode from neighboring MBs in time and in space and by estimating its rate-distortion (RD) cost from the MB in the previous frame. The performance of the proposed algorithm is evaluated in metrics such as the encoding time, the average peak signal-to-noise ratio and the coding bit-rate for test sequences. Simulation results demonstrate that the proposed algorithm can determine the best mode using only one or two rate-distortion cost computations for about half of the MBs resulting in up to 56 % total encoding time reduction with on average 2.4% of bit rate increase at the same PSNR compared to H.264/AVC JM 12.1.