基于现代数字图像处理技术对中间视觉对比度分辨率限制(阈值)的测定

Measuring the contrast resolution limits (threshold) of mesopic vision based on digital image processing technology

背景：在光学研究中,明视觉及暗视觉下眼睛的光谱光视效率均有相应的函数表示,而中间视觉下的光谱光视效率函数至今没有统一标准。而在临床眼科学中,也从未对中间视觉对比度分辨率做相应讨论。目的：测量不同颜色背景下中间视觉同时对比度分辨率限制（阈值）,并探讨不同颜色、不同灰度的背景对人眼对比度分辨率限制（阈值）的影响。方法：实验选取30名矫正视力正常,无眼疾,年龄24~29岁的健康受试者,在MS WINDOWS操作系统环境下,利用连续灰度变化的条纹模型进行测定。结果与结论：分别得出了灰度、红、绿、蓝、黄、青、紫7种特征背景灰度级在30~60之间的对比度分辨率限制（阈值）,并根据相关数据建立了数学模型。对人眼同时对比度分辨率限制（阈值）的测定表明,在中间视觉条件下其值随背景灰度及颜色的变化而改变。在同一背景灰度级下,灰度背景同时对比度分辨率限制最低,青色背景的同时对比度分辨率限制最高。

BACKGROUND：In the optical field,the spectral luminous efficiency of eyes under scotopic vision photopic vision can be expressed as function values,but there is no uniform standard for mesopic vision.OBJECTIVE：To measure simultaneous contrast resolution limits（threshold） of human mesopic vision in different colors background and to approach the influential factors about different colors or different grays.METHODS：We selected 30 health volunteers who have normal corrected vision,no disease of the eyes and from 24 to 29 years of age,on MS WINDOWS operating system,and used modern digital image processing to measure.RESULTS AND CONCLUSION：We have got contrast resolution limits（threshold） on seven kinds of background,including gray,red,blue,yellow,cyan,purple when gray level is from 30 to 60,and set up mathematic model.The measuring of simultaneous contrast resolution limits（threshold） of human mesopic vision suggests that they would change when different colors or different gray background.The simultaneous contrast resolutionlimits（threshold） is the minimal on gray background and the maximal on cyan background,as well as we set up corresponding mathematic models.