Study on measuring human luminance and color contrast sensitivity visual characteristics and their models

In order to explore the contrast sensitivity characteristics of human visual system (HVS), using the liquidcrystal display to display the target grating with 11 kinds of spatial frequencies and 3 average brightnesses for 10 cd/m2, 60 cd/m2 and 90 cd/m2, the experiments was designed to measure the data of the luminance and color contrast sensitivity of HVS of 120 youths. After the data was analyzed and fitted by the least square method, a mathematics model mixed with polynomial and exponential was proposed to describe the contrast sensitivity characteristics of HVS. And the model was compared with the typical models at home and abroad. The results show that the human visual contrast sensitivity increases firstly and then decreases with the increase of the spatial frequency, and when the f is 3 cpd~4 cpd, HVS is the most sensitive, which is consistent with the typical visual models. These show the proposed measurement method is effective and feasible, the proposed visual model is scientific. Furthermore, the operation of this measurement method is easy, the calculation complexity of visual model is relatively smaller. They are superior to the typical measurement method and visual models in practical application, which can offer some reference value.