Unique gray method for visually measuring the white point of CRT displays

Wen, Senfar; Wu, Royce

doi:10.1016/j.displa.2004.09.001

Cited by 2 publications

(2 citation statements)

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“…The error function operates in the code value domain and can produce reliable estimations, without accumulative errors and the hazards of the error prone log-log domain. The difference between the matched code value d M /d max and the fitted code value is used as error function: (9) Optimizing in the code-value domain has certain advantages in the case of gamma brightness matching. All results from the matches are code values, so domain conversions with the inevitable errors are not needed, and the scaling of the code-value domain for the expected gamma values is close to the scaling in the perceptual CIE lightness domain.…”

Section: Improved Methods For Visual Gammameasurement Model Fittingmentioning

confidence: 99%

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Visual gamma measurement and methods to compare gamma models

Besuijen

2007

J Soc Info Display

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Abstract— The correct estimation of the gamma exponent describing the tone‐reproduction curve of a display is an important step in color management. Several methods for visual gamma estimation have been proposed. In this study, the theoretical merits and practical problems of a number of these methods are discussed and compared, and improvements are suggested. A new method to compare gamma models with different numbers of parameters is introduced. In an experiment, spatial and temporal brightness‐matching methods were tested with 32 untrained subjects working on a CRT and an LCD with different resolutions under office and low‐illumination conditions. Illumination had no effect on gamma estimations. Subjects had great difficulties with spatial brightness matching at low resolutions. Temporal and spatial visual brightness matching for untrained subjects showed a larger gamma than photometric fits.

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Section: Improved Methods For Visual Gammameasurement Model Fittingmentioning

confidence: 99%

“…(8) and the two-parameter optimization in the code value domain presented in this paper [Eq. (9)]. The combinations of code values in the matches were chosen to get a good distribution over the code value and CIE lightness domain for the expected values of gamma.…”

Section: Stimuli and Instructionsmentioning

confidence: 99%