Imaging Science and Photochemistry ›› 2019, Vol. 37 ›› Issue (1): 77-86.DOI: 10.7517/issn.1674-0475.180602

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Study on Chroma Contrast Sensitivity Function of the Elderly and Application of Filtering

ZHANG Lei1, LIU Zhen1,2, WANG Qi1, WANG Qian2, KONG Lingjun2,3   

  1. 1. Nanjing Forestry University, Nanjing 210037, Jiangsu, P. R. China;
    2. University of Shanghai for Science and Technology, Shanghai 200093, P. R. China;
    3. Shanghai Publishing and Printing College, Shanghai 200093, P. R. China
  • Received:2018-06-05 Revised:2018-11-29 Online:2019-01-15 Published:2019-01-15

Abstract: In order to study the color visual frequency response characteristics of the elderly, the functional relationship between chroma contrast sensitivity and spatial frequency was obtained. In this paper, based on LCH uniform color space, fixed brightness and hue angle values, using chroma as a variable, the chroma contrast sensitivity experiment was designed, and a large number of human visual observation experiments were conducted. The relationship between chroma contrast sensitivity and spatial frequency was obtained, and an exponential contrast sensitivity function model was constructed. The analysis showed that contrast sensitivity of the elderly increases first and then slowly decreases with the increase of spatial frequency, and there was a difference in chroma contrast between each hue angle. The difference in contrast sensitivity had a great correlation with the color discrimination characteristics of human eyes; building a specific sensitivity function model can be used to implement filtering processing based on the human visual system.

Key words: LCH color space, color vision, chromatic contrast sensitivity function, spatial frequency