JVET-H0036 Condition modification of Strong Intra Smoothing Filter [Y. Kidani, K. Kawamura, S. Naito (KDDI)]

This contribution proposes application conditions of a strong intra smoothing (SIS) filter for non-square blocks. The SIS filter in the JEM-7.0 is disabled as an anchor condition. In the EE1 Test #5, a "correction method" of the SIS filter for non-square blocks is tested. The applicable condition is, however, still said to be incorrect, as a comparison pixel position is not at the center of the end pixels but on the corner of a non-square block. The proposed method is implemented on the top of the EE1 Test #5 software. Although no BD-rate impact was observed, the asserted bug-fix was suggested to be included in the future JEM software.

Currently, the strong filter is disabled, and the conclusion from EE1 was to keep it like that. There seems to be no visual quality problem due to that. Therefore no action was taken on the proposal.