Modeling of the contrast sensitivity saturation depended on the number of cycles of the test sine-wave gratings

Olga I. Krasilnikova; Nikolay N. Krasilnikov; Yury E. Shelepin M.D.

doi:10.1117/12.383095

14 April 2000 Modeling of the contrast sensitivity saturation depended on the number of cycles of the test sine-wave gratings

Olga I. Krasilnikova, Nikolay N. Krasilnikov, Yury E. Shelepin M.D.

Author Affiliations +

Proceedings Volume 3981, Medical Imaging 2000: Image Perception and Performance; (2000) https://doi.org/10.1117/12.383095
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

Abstract

We investigated what mechanism is responsible for the saturation process of the contrast sensitivity dependence upon the number of cycles of sine-wave gratings (SWG). We used the method of mathematical analysis of SWG spatial frequency transformation made by fovea receptive fields of retina by means of convolution of SWG with receptive fields weight functions. We started from matched filtering conception supposing that contrast sensitivity is inversely proportional to threshold grating contrast, which is sufficient for the grating detection in the presence of the internal noise of the visual system. The principal feature of the analysis consists in taking into account the following fact. When the eccentricity increases the size of receptive field increases too and so when the number of cycles of SWG increases under constant spatial frequency, the more part of grating is located in the area of low spatial frequency resolution. Therefore the further increase in the number of cycles of SWG does not effect on the contrast energy of the signal in neural net. The comparison of calculated data and numerous published experimental data demonstrated their good coincidence.

Citation Download Citation

Olga I. Krasilnikova, Nikolay N. Krasilnikov, and Yury E. Shelepin M.D. "Modeling of the contrast sensitivity saturation depended on the number of cycles of the test sine-wave gratings", Proc. SPIE 3981, Medical Imaging 2000: Image Perception and Performance, (14 April 2000); https://doi.org/10.1117/12.383095

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KEYWORDS

Contrast sensitivity

Spatial frequencies

Visual system

Retina

Convolution

Lead

Mathematics

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