【摘要】 目的为了探讨不同年龄段人眼的对比度敏感视觉特性,以获取对比度敏感函数模型。方法基于LCH颜色空间,利用显示器显示不同空间频率正弦波图像,测量青年(18～25岁)、中年(30～45岁)、老年(50～70岁)共30位观察者的明度、彩度、色调角对比敏感度数据。结果随着空间频率的增加,人眼对比敏感度先增加后减小,当空间频率在2～4周期/度时,人眼最为敏感;明度对比敏感度高于彩度、色调角;青年组3种对比敏感度数据均高于中老年组。结论采用指数函数对测量数据进行了拟合,构建了对比敏感度函数模型,可用于实现人眼视觉系统的建模,能够用数学公式预测人眼对彩色图像质量的感知。更多还原

【Abstract】 The paper aims to discuss visual characteristics of contrast sensitivity of different ages to get the contrast sensitivity function model. Based on the color space of LCH, 30 observers of three groups of youth(18～25 years old),middle age(30～45 years old) and old age(50～70 years old) were measured for lightness, chroma and hue angle contrast sensitivity curves. With the increase of the spatial frequency, the changes slowed slowly from low to high; the human eye was the most sensitive when the spatial frequency was 2～4 circles/degree. The lightness contrast sensitivity is higher than that of chroma and hue angle. The contrast sensitivity of the youth group is higher than the middle and old age groups.The exponential function is used to fit the measured data and a contrast sensitivity function model is established. The model can be used to realize the modeling of human visual system. It can use mathematical formulas to predict the human eye perception of the quality of color images.更多还原