Efficient SIMD-based implementation of adaptive filter

Directional Adaptive Interpolation Filtering (DAIF) is a novel interpolation technique that was proposed recently for hybrid video coding. It was reported, that this technique outperforms the standard H.264/AVC interpolation in terms of coding gain whereas requiring smaller number of arithmetic operations. In this publication we present an optimized implementation of DAIF on a modern computing platform exploiting the Single Instruction Multiple Data (SIMD) parallelism. In addition, we provide a complexity analysis in which the computational complexity is estimated as number of clock cycles per output sample. Proposed SIMD-based implementation of DAIF has lower or comparable interpolation complexity, compared to the highly optimized SIMD-based implementation of the H.264/AVC interpolations. Considering significantly better coding gain provided by DAIF, we believe this approach will play a significant role in future video coding standards.