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Calibration of diagnostic monitors: Theoretical determination of optimal luminance settings
Author(s) -
Båth Magnus,
Sund Patrik,
Ungsten Linda,
Månsson Lars Gunnar
Publication year - 2006
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.2372424
Subject(s) - citation , computer science , luminance , calibration , information retrieval , library science , mathematics , artificial intelligence , statistics
— Common practice today is to calibrate diagnostic monitors according to the gray‐scale standard display function (GSDF) described in DICOM part 14. However, the GSDF is based on the assumption of variable adaptation of the human‐visual system (HVS). It is well known that the HVS adapts to the average quantity of light falling on the retina, so‐called fixed adaptation. For the luminance setting of a monitor, the effect of fixed adaptation is of interest. The wider the luminance range of the monitor, the larger the number of available just‐noticeable differences (JNDs). However, at the same time, the sensitivity of the HVS to the average contrast change is decreased since it occurs at a luminance level further away from the adaptation luminance. A computer program was therefore written which takes the effect of the fixed adaptation into account by determining the number of effective JNDs for a given luminance setting of a monitor. The probability of detecting each change in presentation value is then calculated from the distribution of effective JNDs. Based on the assumptions implemented in the program, it is shown that for monitors calibrated according to the GSDF, the optimal luminance setting for visualizing the image information in the best possible way is to use the entire available luminance range.