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The human eye as an optical information processing instrument, the contrast sensitivity of the human eye to observed goal with different contrast caused by luminance and color is to measure one of the main indicators of the human eye characteristics of the space vision. The contrast sensitivity function of human vision is to describe the relationship between the contrast sensitivity of the human eye to target that is the reciprocal of detection contrast threshold under different conditions and the spatial frequency. Modern optical and opto-electronic imaging technology have opened up a new way to expand the application and technology of human visual characteristics so as to make the contrast sensitivity function model of human vision be done a great deal of research by home and abroad researchers, and a number of models be put forward, so far. However, the contrast sensitivity function models of human vision are different because of different research and measurement methods, and exist certain deviation with raw data. In this paper, the human vision contrast detection threshold is measured by 21 young people observation targets which are displayed by a CRT display, at first. And based on least-squares fitting and measurement data, a new optic transfer function model of human vision is put forward, and calculated the deviation of the contrast threshold of part of the frequencies between the model and measurement data. It is resulted that deviations are very small so as to show that the fitting model is a very good transfer function model of vision system.

KEYWORDS

human vision; contrast detection threshold; least-squares fitting

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Autor: Jing Shen

Fuente: http://www.scirp.org/



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