Abstract
Perceptual linearity of grayscale images based on a contrast sensitivity model is a widely recognized and used standard for medical imaging visualization. This approach ensures consistency across devices and provides perception of luminance variations in direct relationship to changes in image values. We analyze the effect of aging of the human eye on the precept of linearity and demonstrate that not only the number of just-noticeable differences diminishes for older subjects but also linearity across the range of luminance values is significantly affected. While loss of JNDs is inevitable for a fixed luminance range, our findings suggest possible corrective approaches for maintaining linearity.
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Acknowledgments
The authors would like to thank P. Leon, MD at the Ophthalmological University Clinic of Trieste, who kindly provided optical aberration data, and M. Choi, Ph. D. student at the University of Maryland, for help with the reader study. The authors declare that they have no competing financial interests. The mention of commercial products herein is not to be construed as either an actual or implied endorsement of such products by the Department of Health and Human Services. This is a contribution of the Food and Drug Administration and is not subject to copyright.
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Ramponi, G., Badano, A. Method for Adapting the Grayscale Standard Display Function to the Aging Eye. J Digit Imaging 30, 17–25 (2017). https://doi.org/10.1007/s10278-016-9900-2
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DOI: https://doi.org/10.1007/s10278-016-9900-2