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Non-CE5: A Simplification of ALF Coefficient Signalling
Abstract
This document proposes a simplification by removing the coefficient predictions in ALF signaling. In VTM-5.0, ALF signaling may involve (i) recursive prediction of ALF coefficients and (ii) prediction using fixed filters. It is proposed to remove both prediction steps and relevant syntax elements. The experimental results show that the proposed changes lead to negligible coding losses over VTM-5.0 under CTC.
JVET-O0669 Non-CE5: A Simplification of ALF Coefficient Signalling [H. E. Egilmez, N. Hu, V. Seregin, M. Karczewicz (Qualcomm)]
This document proposes a simplification by removing the coefficient predictions in ALF signalling. In VTM-5.0, ALF signalling may involve (i) recursive prediction of ALF coefficients and (ii) prediction using fixed filters. It is proposed to remove both prediction steps and relevant syntax elements. The experimental results show that the proposed changes lead to negligible coding losses over VTM-5.0 under CTC.
Fixed filters would still be existing, but not for prediction. It is reported that the fixed filters are sometimes used at CTU level adaptation.
Decision: Adopt JVET-O0669 both aspects
Note that JVET-O0427 is identical with the first aspect (remove recursive prediction)
and JVET-O0425 is identical with the second part.
Decisions
adopted
Adopt JVET-O0669 both aspects
Citation