JVET-R0280 AHG16: Cleanup of intra reference sample filter selection [J. Heo, H. Jang, J. Choi, J. Nam, M. Koo, J. Lim, S. Kim (LGE)]
In current VVC draft, the intra mode checking process is used to select intra reference sample filters. If the current intra mode is an angular mode with integer slope, a 3-tap [1 2 1]/4 reference sample filter is applied. Since the 4-tap [16 32 16 0]/64 smoothing filter for integer sample position is the same as the 3-tap reference sample filter for an angular mode with integer slope, the 3-tap reference sample filter used in the reference sample generation process can be replaced by the 4-tap smoothing filter used in the interpolation process. Therefore, this contribution proposes to remove the intra mode checking process, which process is redundant, and directly determine intra reference sample filters. The experimental results show that the proposed method provides the coding performance changes of 0.00%, 0.00%, and -0.05% BD-rate in AI, RA, and LD configuration, respectively. Encoding and decoding run-times are not changed.
Was previously proposal in JVET-Q0292, but the new contribution modifies the text description.
Benefit would be removal of 40 lines in clean software (not VTM). Too late in process to make micro changes. Stability of design has higher priority.
No action was taken on this.