just-noticeable difference


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Related to just-noticeable difference: Weber's law

just-noticeable difference

[¦jəst ¦nōd·ə·sə·bəl ′dif·rəns]
(psychology)
The smallest difference between luminances or colors of areas, usually adjacent to each other, that can be easily discerned or is obvious from ordinary observation. Also known as difference limen; difference threshold. Abbreviated jnd.
References in periodicals archive ?
Video quality measurement itself is a highly subjective field, though increasingly Just-Noticeable Difference and Picture Quality Rating are finding acceptance.
Bowling noted that Radiant's Inspect machine vision software draws from light measurement techniques, and that software tools for detecting just-noticeable differences (JND) in visible light uniformity in illuminated components can be used to detect anomalous contrast variations on non-lit components.
Chapters outline the steps in a sensory evaluation project; the human senses and sensory attributes like appearance, odor, and flavor; equipment, tasters, and samples; psychological pitfalls that invalidate studies; how sensory responses can be measured in quantitative terms; guidelines for selecting an approach; common sensory tests for difference; attribute tests; thresholds and just-noticeable differences; the selection and training of panelists; descriptive testing; affective tests; classic qualitative and quantitative methods for testing with consumers; and the latest methods used by sensory researchers in consumer products companies.