• Yaowu Xu's avatar
    Reversible WHT pair · 7968d29f
    Yaowu Xu authored
    This commit changed the forward and the inverse 4x4 Walsh Hadamard
    transform to a new pair, where the inverse transform can pefectly
    reconstuct the input to forward transform. It also does so without
    changing the input and output value range. Even more, it does not
    change the complexity of the transforms.
    
    While it was not expected to improve the results of our current test,
    it does improve std-hd set by 0.2% on all metrics. No change on derf.
    
    Change-Id: Ie4f23ddd3a0f3c5fbe97fb58399f860031f99337
    7968d29f
idctllm.c 9.84 KB