1 Scope
This part of ISO 20462 is part of a multiple-part standard pertaining to the subjective evaluation of pictorial still image quality. This part of ISO 20462
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a) defines the units by which image quality is quantified (just noticeable differences, or JNDs);
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b) describes the influence of stimulus properties, observer characteristics, and task instructions on results obtained from rating experiments;
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c) provides a flow chart for choosing the preferred psychophysical method for determining image quality from among those defined in subsequent parts of ISO 20462.