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Image quality evaluation, interval-scaled

For comparisons of perceived image quality among significantly different systems, a requirement frequently encountered in electronic production, the technique of intervalscaling is recommended by most students of psycho-physics. Interval scaling gives some indication of the magnitude of preference for one system over another. Observers are asked to place a numerical value upon the perceived differences (either in total or with regard to a specified characteristic such as noise, resolution, colour rendition, etc.).

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