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The CIE94 Colour Difference Formula for Describing Visual Detection Thresholds in Static Noise

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The parametric factors kL , kC and kH that scale the CIELAB components ΔL*, ΔC* and ΔH* in the CIE94 colour difference formula are unity under reference conditions. When the conditions are changed, the scaling factors may be adapted to account for the influence of specific experimental conditions on perceived colour differences. We determined thresholds for the visibility of static background noise and for the visibility of a test symbol. The noise was present in only one of the L*, C* or H* dimensions, and the test symbol was an increment to the background, also in one of the dimensions L*, C* or H*. In order to maintain a perceptual uniform difference metric between test symbol and noisy background we arrived at kL = 0.15, kC = 0.52, and kH = 2.21, such that a just noticeable difference corresponds to ΔE*94=1. When the dimension (L*, C* or H*) of the incremental test symbol is the same as that of the noise in the background, the threshold for the test symbol increases linearly with the noise. When the dimensions are different, the thresholds for the test symbol remain constant (background noise in L*) or slowly increase (background noise in C* or H*).
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Document Type: Research Article

Publication date: January 1, 2004

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  • Started in 2002 and merged with the Color and Imaging Conference (CIC) in 2014, CGIV covered a wide range of topics related to colour and visual information, including color science, computational color, color in computer graphics, color reproduction, volor vision/psychophysics, color image quality, color image processing, and multispectral color science. Drawing papers from researchers, scientists, and engineers worldwide, DGIV offered attendees a unique experience to share with colleagues in industry and academic, and on national and international standards committees. Held every year in Europe, DGIV papers were more academic in their focus and had high student participation rates.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual papers for details.

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