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danielgtaylor / jpeg-archive

Utilities for archiving JPEGs for long term storage.
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UniMetric #110

Closed zvezdochiot closed 3 years ago

zvezdochiot commented 5 years ago

Go to the more intuitive UniMetric scale:

UM = 1.9 - 1.15 * sqrt(m(MPE))
UM = 1.8 * corsigma(corsigma(corsigma(m(SSIM))))
UM = 0.3 + 1.8 * corsigma(corsigma(m(MS_SSIM)))
UM = -10.0 + 0.105 * m(SMALLFRY)
UM = m(SHARPENBAD)

corsigma(m) = 1.0 - sqrt(1.0 - m * m);

UniMetric scale quality:

0.50 LOW
0.76 MEDIUM
0.93 HIGH
0.99 VERYHIGH

See also https://github.com/ImageProcessing-ElectronicPublications/jpeg-recompress

zvezdochiot commented 3 years ago

no actual.