Add implementation of PNSR_HVS_M. This modified version of the PSNR takes into account the limitation of the Human Visual System (in particular the response to Contrast Sensivity and frequency masking). Only detectable visual errors are used in the PSNR computation.
Add implementation of PNSR_HVS_M.
This modified version of the PSNR takes into account the limitation of the Human
Visual System (in particular the response to Contrast Sensivity and frequency
masking). Only detectable visual errors are used in the PSNR computation.

Based on the paper entitled "On between-coefficient contrast masking of DCT basis
functions" by Nikolay Ponomarenko, Flavia Silvestri, Karen Egiazarian, Marco Carli,
Jaakko Astola, Vladimir Lukin.

The implementation is based on the initial C code in daala at
https://git.xiph.org/?p=daala.git;a=blob;f=tools/dump_psnrhvs.c

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