• Jingning Han's avatar
    16x16 butterfly inverse ADST/DCT hybrid transform · cd907b16
    Jingning Han authored
    rebased.
    
    This patch includes 16x16 butterfly inverse ADST/DCT hybrid
    transform. It uses the variant ADST of kernel
        sin((2k+1)*(2n+1)/4N),
    which allows a butterfly implementation.
    
    The coding gains as compared to DCT 16x16 are about 0.1% for
    both derf and std-hd. It is noteworthy that for std-hd sets
    many sequences gains about 0.5%, some 0.2%. There are also few
    points that provides -1% to -3% performance. Hence the average
    goes to about 0.1%.
    
    Change-Id: Ie80ac84cf403390f6e5d282caa58723739e5ec17
    cd907b16
vp9_blockd.h 17.6 KB