Title :
Motion Compensated Prediction and Interpolation Filter Design in H.265/HEVC
Author :
Ugur, K. ; Alshin, Alexander ; Alshina, Elena ; Bossen, Frank ; Woo-Jin Han ; Jeong-Hoon Park ; Lainema, Jani
Author_Institution :
Nokia Corp., Tampere, Finland
Abstract :
Coding efficiency gains in the new High Efficiency Video Coding (H.265/HEVC) video coding standard are achieved by improving many aspects of the traditional hybrid coding framework. Motion compensated prediction, and in particular the interpolation filter, is one area that was improved significantly over H.264/AVC. This paper presents the details of the interpolation filter design of the H.265/HEVC standard. First, the improvements of H.265/HEVC interpolation filtering over H.264/AVC are presented. These improvements include novel filter coefficient design with an increased number of taps and utilizing higher precision operations in interpolation filter computations. Then, the computational complexity is analyzed, both from theoretical and practical perspectives. Theoretical complexity analysis is done by studying the worst-case complexity analytically, whereas practical analysis is done by profiling an optimized decoder implementation. Coding efficiency improvements over the H.264/AVC interpolation filter are studied and experimental results are presented. They show a 4.0% average bitrate reduction for the luma component and 11.3% average bitrate reduction for the chroma components. The coding efficiency gains are significant for some video sequences and can reach up to 21.7%.
Keywords :
computational complexity; decoding; filtering theory; interpolation; motion compensation; video coding; H.265-HEVC; bitrate reduction; chroma components; coding efficiency gains; computational complexity; high efficiency video coding; hybrid coding framework; interpolation filter design; luma component; motion compensated prediction; optimized decoder implementation; theoretical complexity analysis; video coding standard; worst-case complexity; Finite impulse response filters; Frequency response; Interpolation; Quantization (signal); Standards; Video coding; H.265; HEVC; Video coding; interpolation filter; standards;
Journal_Title :
Selected Topics in Signal Processing, IEEE Journal of
DOI :
10.1109/JSTSP.2013.2272771