A novel intra prediction method is presented in this paper, where the prediction samples are generated by an extrapolation filter. This method has been proposed for the future video coding standard. Firstly, an extrapolation filter is either derived from the reconstructed neighboring area or inherited from the neighboring decoded blocks of the current block. Secondly, the prediction samples are generated by an extrapolation process in a parallel manner. The proposed extrapolation filter-based intra prediction method is implemented on top of the exploration test model ECM-10.0 reference software, and the simulations are conducted according to the common test conditions. Compared to ECM-10.0, the simulation results show {0.24%,0.19%,0.19%} BD-rates saving for {Y,U,V} components in the all intra configuration and {0.10%,0.12%,0.19%} BD-rates saving for {Y,U,V} components in the random access configuration.

Intra template matching prediction (Intra TMP) is a promising intra prediction tool which generates the prediction block by copying from a reconstructed block of the current frame. The position of the reconstructed block is derived by template matching at both encoder and decoder. Intra TMP has been adopted in enhanced compression model (ECM) for both screen content and natural content due to its outstanding trade-off between coding efficiency and complexity. This paper describes an advanced intra TMP algorithm with fusion techniques to further improve the coding efficiency. The proposed intra TMP fusion scheme includes the following aspects: 1) extended template matching search range, 2) improved search procedure with multiple candidates, 3) adaptive fusion method with template updating, and 4) support fractional-pel precision in intra TMP. Experimental results show that the proposed intra TMP fusion scheme provides 0.76% average luma Bjøntegaard delta rate (BD-rate) reduction with negligible runtime increase over ECM-8.0 in all-intra configuration.