Edge-preserving Reference Sample Filtering and Mode-dependent Interpolation for Intra Prediction
IEEE Transactions on Circuits and Systems for Video Technology(2020)
摘要
High Efficiency Video Coding is the latest video compression standard, which achieves the best coding performance up until now. Specifically, intra prediction is a tool that removes spatial redundancy in a single frame and then a predictor is generated from its neighboring reference samples based on a specific interpolation scheme. In this paper, we propose an edge-preserving intra reference sample filtering method using a bilateral filter, which is implemented as hardware-friendly. Two parameters of the bilateral filter are modeled by block size and mean amplitude of the pixel intensity. In addition, a mode-dependent interpolation scheme is proposed, which takes the directionality of angular predictions into account. The experimental results show that a BD rate-reduction of 0.63% can be achieved for all intra configurations by combining the two methods. We also demonstrate that the subjective quality of the reconstructed frames can be improved.
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关键词
Interpolation,Smoothing methods,Encoding,Quantization (signal),High efficiency video coding,Standards
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