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Table 1 ITU-T 5-point scale - ACR Grading value Estimated quality Perceived impairment 5 Excellent Imperceptible 4 Good Perceptible but not annoying 3 Fair Slightly annoying 2 Poor Annoying 1 Bad Very annoying.
Table 4 Convert table from PSNR to MOS MOS Quality Impairment PSNR (dB) 5 Excellent Imperceptible >37 4 Good Perceptible but not annoying 31 ~ 37 3 Fair Slightly annoying 25 ~ 31 2 Poor Annoying 20 ~ 25 1 Bad Very annoying <20.
Table 3 MOS grades [32] MOS Quality Quality scale Effort required to understand meaning scale 5 Excellent Imperceptible No effort required 4 Good Perceptible, but not annoying No appreciable effort required 3 Fair Slightly annoying Moderate effort required 2 Poor Annoying Considerable effort required 1 Bad Very annoying No meaning was understood.
Rating Speech quality Levels of distortion 5 Excellent Imperceptible 4 Good Just perceptible but not annoying 3 Fair Perceptible and annoying 2 Poor Annoying but not objectionable 1 Unsatisfactory Objectionable.
Sometimes the division is barely perceptible: it just makes sense.
Accordingly the scale of SDG will range from (−4 to 0) with the following interpretation: (−4): Unsatisfactory (or) Very Annoying, (−3): Poor (or) Annoying, (−2): Fair (or) Slightly annoying, (−1): Good (or) Perceptible but not annoying, and : Excellent (or) Imperceptible.
For this reason we have good and readily perceptible reasons for rejecting the use of such features as basic criteria for social distribution.
It was only just perceptible in a murky, positively grudging, blue light.
This, too, has always been a large part of India's story, visible at every disaster, perceptible on every street corner in good times and bad.
But Schubert faults Bush for a lack of perceptible economic policy of any kind, good or bad.
It's just not perceptible to the human eye".
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com