彩色成像系统最小可分辨色差测量方法研究

收稿日期:2014-09-12;修订日期:2014-10-17

基金项目:陕西省科技厅项目(2014KW05,2014JM8333);陕西省教育厅项目(12JK0980)

作者简介:于洵(1964-),男,教授,主要从事光电测试技术和光电信息系统与技术的研究与教学工作。Email:64906086@https://www.sodocs.net/doc/ca7113776.html, 通讯作者:田冰心(1989-),女,硕士生,主要从事光电测试技术和光电信息系统与技术方面的研究。Email:t.bingxin@https://www.sodocs.net/doc/ca7113776.html, 彩色成像系统最小可分辨色差测量方法研究

于洵1,田冰心1,姜旭2,聂亮1,陈靖1

(1.西安工业大学光电学院，陕西西安710032；2.西安应用光学研究所，陕西西安710065)

摘要:最小可分辨色差通常使用基于人眼观测的主观方法测量，精度不高。为了提高测量精度，利用人眼敏感度函数Barten 模型建立起来一种客观测量模型。即彩色四杆靶图案被成像系统接收，经色彩空间变换、傅里叶变换、人眼敏感函数处理，当测试图案敏感度值与由人眼敏感度函数决定的人眼敏感度阈值相匹配时，将此时的图片转换到CIELAB 颜色空间并计算色差，记录不同空间频率四杆靶的测试结果并与主观测量结果相比较。结果表明：基于人眼视觉模型的客观测量方法与主观测量方法所得结果相一致，即所提出的客观测量方法是可行的。

关键词:MRED ；Barten 模型；空间频率；敏感度函数；敏感度阈值

中图分类号:TP306+.2文献标志码:A 文章编号:1007-2276(2015)05-1633-05

Measurement method of MRED of color imaging system

Yu Xun 1,Tian Bingxin 1,Jiang Xu 2,Nie Liang 1,Chen Jing 1

(1.School of Optoelectronic Engineering,Xi'an Technological University,Xi'an 710032,China;

2.Xi'an Institute of Applied Optics,Xi'an 710065,China)

Abstract:MRED with a low precision usually can be detected by a subjective way which is based on the human eye observation before.In order to improve the measurement accuracy,a new objective way based on the theory of Barten module was built,which was one model of Contrast Sensitivity Functions (CSF).Four-bar target pattern was received by color imaging system.After a series of processing such as color space conversion,Fourier transform and CSF processing,the chromatic aberration on the CIELAB color space was calculated when the chromatic aberration of the test pattern reached the threshold value determined by CSF.Both of the two results tested by the subjective and objective way on different spatial frequencies of the four-bar target were recorded and compared.The results show that the value got by the subjective measurement method is consistent with that of the objective.That means the subjective measurement method based on human visual model in this paper is desirable.

Key words:MRED;Barten model;spatial frequency;CSF;sensitivity threshold value

第44卷第5期

红外与激光工程2015年5月

Vol.44No.5Infrared and Laser Engineering May 2015