Frequency-Based Adaptive Interpolation Filter in Intra Prediction

This paper proposes a method to improve the fractional interpolation of reference samples in Versatile Video Coding (VVC) intra prediction. The proposed uses additional filters which use more integer-positioned for prediction according frequency information samples. In VVC, 4-tap Discrete Cosine Transform-based filter (DCT-IF) and Smoothing (SIF) are alternatively performed on block size directional mode sample interpolation. four alternative such as 8-tap/4-tap DCT-IFs, 4-tap/8-tap SIFs an selection using high-frequency ratio calculated from one-dimensional (1D) transform proposed. frequency-based Adaptive Filter allows achieve overall Bjøntegaard Delta (BD) rate gains −0.16%, −0.13%, −0.09% Y, Cb, Cr components, respectively, compared with VVC.