| JCTVC-M0223 Non-SCE4.1: Fixed Inter-layer Filter for SNR Scalability with Only One Non-unity Coefficient [X. Zhang, P. Lai, S. Liu, S. Lei (MediaTek)]
This contribution presents a fixed inter-layer filter for SNR scalability, in which there is only one non-unity coefficient. The filter footprint is 3×3 square, with coefficient 8 applied to the to-be-filtered sample and unity coefficients (=1) applied to its eight immediate neighbors. In the IntraBL framework, the filtering process is proposed to be turned on/off on a CU-by-CU basis using a CU-level filter control flag.
The test results are, for EL+BL luma BD-rates, RA SNR −0.8%, LDP SNR −2.1%, and LDB SNR −0.8%. The average encoding and decoding runtimes are 102% and 102%. The proposed method reportedly has no impact on the worst-case complexity.
The proposed filter is non-separable, but "almost separable".
The proposed scheme reportedly has lower complexity than M0058 (non-separable 5x5 diamond) and M0087 (5-tap separable), but lower compression benefit. This scheme has roughly only half of the gain of the other two. No action.
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