JCTVC-M0184 Non SCE1: Cross-check for JCTVC-M0115 Simplification of remaining modes coding in SHVC [Y. He (Interdigital)]
JCTVC-M0123 Non-SCE 1: Constrained intra prediction at enhancement layer [C. Kim, B. Jeon (LG)]
This contribution presents a constrained intra prediction (CIP) at enhancement layer (EL). In the SHM 1.0, when CIP is enabled, Intra BL cannot be used in intra prediction. In the proposed technique, when CIP is enabled, an intra BL CU at the enhancement layer that refers to an intra coded CU at the base layer should be used in intra prediction. Simulation results reportedly show 1.3%, 0.2% BD-rate savings on average for AI-2x, AI-1.5x respectively, compared with SHM 1.0 anchors (with CIP on).
In the proposed scheme the prediction mode of each 4x4 collocated region in the base layer is checked by the decoder, and if they are all intra, IntraBL prediction is allowed.
It was asked what would be the impact if an encoder-only constraint was used to just not select intra BL when this would cause reference to non-intra regions in the base layer (without requiring the decoder to detect this case and operate differently in such regions).
It was commented that the application of the loop filter across the boundary of the intra region in the base layer could cause some error propagation. The region of support of the upsampling filter would also extend into adjacent regions, causing additional propagation effects.
Further study of CIP in the context of SHVC is recommended.
JCTVC-M0391 Non-SCE1: Crosscheck of JCTVC-M0123 on constrained intra prediction at enhancement layer [T.-D. Chuang, Y.-W. Huang (MediaTek)] [late]
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