JVET-AE0055 AHG12: Sign prediction parameter configuration for low-delay conditions [Y. Yasugi, T. Ikai (Sharp)]

In JVET-AD0105, the common test condition with a modification to the sign prediction parameter to AI and RA was adopted. In this contribution, the same configuration that the NumSignPred parameter in QP22 is set to four rather than eight is also applied for the low-delay conditions (LB and LP), thus it will be used in all conditions. Experimental results reportedly show that the proposed modification reduced the encoding time in QP22 on the low-delay conditions by 2%.

Very small variation (<=0.02), sometimes gain, sometimes loss per sequence.

The same setting was already used in AI and RA.

Decision (CTC): Adopt JVET-AE0055.