6.2.10Transforms in SHVC
JCTVC-M0033 On secondary transforms for Intra_BL residue [A. Saxena, F. Fernandes (Samsung)]
(No presenter available Fri 19:00 & 20:37.)
(Presentation chaired by G. Sullivan 24th Wed. p.m.)
In this contribution, a secondary transform scheme is provided for Intra_BL residue. A Rate-Distortion based secondary transform scheme is applied for the luma component of Intra_BL residue in the enhancement layer (EL) at block sizes 8x8 and larger of scalable video coding. For the chroma component and 4x4 luma Intra_BL residues, the standard DCT-like and DST-like (transforms already in SHM 1.0) are retained. Two sets of results are presented in this contribution: first when only one secondary transform is applied, and second when either of the two secondary transforms are applied. Results are also shown when a 8x8 rotational transform is used as a secondary transform. Simulation results reportedly show that the more complex variant of the proposal provides average luma gains of 1.4% and 0.9% for (BL+EL) are obtained for All Intra 2x and All Intra 1.5x settings, respectively, for the secondary transforms scheme presented in this contribution.
The contributor indicated that, in the scalability case, the larger gains are for larger blocks.
It was commented that the proposal seems like a general coding efficiency improvement proposal that proposes additional complexity for a purpose somewhat unrelated to scalability functionality. A participant remarked that the proposal also introduces undesirable irregularity in the transform stage.
No action.
JCTVC-M0307 Cross-check report of On secondary transforms for Intra_BL residue (JCTVC-M0033) [L. Guo (Qualcomm)]
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