Of itu-t sg16 wp3 and iso/iec jtc1/SC29/WG11

JCTVC-O0163 SCE3: Inter-layer prediction modes based on base layer sharpness filter [M. Sychev, V. Anisimovskiy, S. Ikonin (Huawei)]

Generates second inter-layer reference which is adaptively sharpened after upsampling, by

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  hor/ver gradient and gradient magnitude
  
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  Blurring filter on gradient magnitude
  
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  Displacement vector calculation (based on hor/ver difference in gradient map, optical-flow like)
  
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  Displacement used to determine the position from which bilinear interpolation (1/16 pel accuracy) is performed.
  

Parameters sent in SPS: gradient threshold Tr, ShD in displacement vector estimation

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  Spatial scalability: −1.0%(Y)/ −2.3% (U) /−2.3%(V),
  
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  SNR scalability: −0.5%(Y)/ −1.6% (U) / −1.4%(V).
  

Computation and memory complexity seem to be non-negligible (decoder run-time increase reported 15-20%, which may not be fully precise).

Sequential steps, but at pixel level, latency may therefore be minor (around 10 lines?)

Gain is unequally distributed (people on street alone gives >4%)

Several experts express opinion that the gain vs. complexity tradeoff does not justify to consider the proposal for adoption.