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Video Coding With Low-Complexity Directional Adaptive Interpolation Filters

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5 Author(s)
Rusanovskyy, D. ; Dept. of Signal Process., Tampere Univ. of Technol., Tampere, Finland ; Ugur, K. ; Hallapuro, A. ; Lainema, J.
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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.

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Circuits and Systems for Video Technology, IEEE Transactions on  (Volume:19 ,  Issue: 8 )