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  • Frank Bossen's avatar
    Modify chroma QP mapping table · 4f150191
    Frank Bossen authored
    Chroma QP mapping tables are modified such that the relationship
    between luma PSNR an chroma PSNR is on average closer to the
    one observed with HM 16.20.
    The net effect is that bits are shifted from chroma to luma and
    BD-rate differences between VTM and HM are most consistent across
    components.
    
    BD-rate between VTM 8.0 and HM 16.20:
    AI: -24.09% -31.32% -32.82%
    RA: -34.84% -46.33% -46.91%
    LB: -30.02% -42.62% -40.94%
    LP: -33.12% -44.28% -42.80%
    
    BD-rate between VTM 8.0 plus this change and HM 16.20:
    AI: -24.99% -25.35% -26.86%
    RA: -35.76% -39.04% -40.03%
    LB: -30.56% -32.89% -30.77%
    LP: -33.62% -34.86% -32.56%
    4f150191