ADAPTIVE INTERPOLATION FILTER FOR H.264/AVC Bhavana Prabhakar Student Id: Department of Electrical Engineering

H.264/ADVANCED VIDEO CODING: Encoder block diagram H.264 [18]

H.264/ADVANCED VIDEO CODING: Decoder block diagram H.264 [18]

Integer samples (shaded blocks with upper-case letters) and fractional sample positions (non-shaded blocks with lower-case letters). Example for filter size 6 x6. [16]

An individual filter is to be used for the interpolation of each fractional-pel position The estimation of the coefficients and the motion compensation are performed in the steps given in [16] Filter coefficients are to be coded Filter coefficients are subject to quantization, followed by prediction and entropy coding The aliasing effects are minimized by suppressing the high- frequency components Steps to reduce blurring effects. STEPS TAKEN FOR IMPLEMENTATION OF AN AIF

 Displacement vectors are estimated for every image to be coded. For the purpose of interpolation, the standard interpolation filter of H.264/AVC is applied to every reference image.  2-D filter coefficients are calculated for each sub-pel position independently by minimization of the prediction error energy:

AIF: Adaptive interpolation filter AVC: Advanced video coding BD – ROM: Blue ray disc – read only memory CIF: Common intermediate format HD – DVD: High definition - digital video disc ITU: International telecommunication union KTA: Key technical area MCIF: Motion compensated interpolation filter MPEG: Moving picture experts group VCEG: Video coding experts group

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[11] H.264/AVC reference software version JM Jan [Online]. [12] KTA software, version JM11.0 KTA Mar [Online]. [13] Y. Vatis and J. Ostermann, “Prediction of P- and B-frames using a 2-D non-separable adaptive Wiener interpolation filter”,in ITU-T SG16/Q [15] (VCEG) Doc VCEG-AD08, Hangzhou, China, Oct [14] Y. Vatis and J. Ostermann, ITU-T SG16/Q [15] (VCEG) VCEG-AE16, Marrakech, Morocco, Jan [[15]] S. Wittman and T. Wedi, “Separable adaptive interpolation filter”,in ITU-T SG16/Q6, Doc. C-0219, Geneva, Switzerland, Jul [16] Y. Vatis and J. Ostermann “Adaptive interpolation filter for H.264/AVC”, IEEE Trans. circuits syst. video technol., vol. 19, pp , Feb [17] D. Rusanovskyy, K. Ugur, and J. Lainema, “Adaptive interpolation with directional filters”, in ITU-T SG16/Q.6 Doc. VCEG-AG21, Shenzhen,China, Oct [18] D. Marpe, T. Wiegand and G. J. Sullivan, “The H.264/MPEG-4 AVC standard and its applications”, IEEE Communications Magazine, vol. 44, pp , Aug [19] T. Wiegand and G. J. Sullivan, “The picturephone is here:Really”, IEEE Spectrum, vol.48, pp , Sep [20] I. E. Richardson, “The H.264 Advanced Video Compression Standard”, 2nd Edition, Wiley 2010.