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The study of subjective visual quality, and the development of computed quality metrics, require accurate and meaningful measurement of visual impairment. A natural unit for impairment is the JND. In many cases, what is required is a measure of an impairment scale, that is, the growth of the subjective impairment, in JNDS, as some physical parameters is increased.
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Watson et al. (2001) studied this question.
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