Video coding with low-complexity directional adaptive interpolation filters

  • Authors:

  • Dmytro Rusanovskyy;Kemal Ugur;Antti Hallapuro;Jani Lainema;Moncef Gabbouj

  • Affiliations:

  • Department of Signal Processing at Tampere University of Technology, Tampere, Finland;Nokia Research Center, Nokia Corporation, Tampere, Finland;Nokia Research Center, Nokia Corporation, Tampere, Finland;Nokia Research Center, Nokia Corporation, Tampere, Finland;Department of Signal Processing at Tampere University of Technology, Tampere, Finland

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

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Abstract

A novel adaptive interpolation filter structure for video coding with motion-compensated prediction is presented in this letter. The proposed scheme uses an independent directional adaptive interpolation filter for each sub-pixel location. The Wiener interpolation filter coefficients are computed analytically for each inter-coded frame at the encoder side and transmitted to the decoder. Experimental results show that the proposed method achieves up to 1.1 dB coding gain and a 15% average bit-rate reduction for high-resolution video materials compared to the standard nonadaptive interpolation scheme of H.264/AVC, while requiring 36% fewer arithmetic operations for interpolation. The proposed interpolation can be implemented in exactly 16-bit arithmetic, thus it can have important use-cases in mobile multimedia environments where the computational resources are severely constrained.