基于高动态范围图像的亮度测量方法  

Luminance Measurement Based on High Dynamic Range Images

作　　者：田会娟[1,2] 郝甜甜[3,2] 张辉[1,2] 牛萍娟[1,2] Tian Huijuan;Hao Tiantian;Zhang Hui;Niu Pingjuan(Tianjin Key Laboratory of Advanced Electrical Engineering and Energy Technology,School of Electrical Engineering&Automation,Tianjin Polytechnic University,Tianjin 300387,China;School of Electronics and Information Engineering,Tianjin Polytechnic University,Tianjin 300387,China;Engineering Research Center of Ministry of Education on High Power Solid State Lighting Application System,Tianjin 300387,China)

机构地区：[1]天津工业大学电气工程与自动化学院天津市电工电能新技术重点实验室,天津300387 [2]大功率半导体照明应用系统教育部工程研究中心,天津300387 [3]天津工业大学电子与信息工程学院,天津300387

出　　处：《激光与光电子学进展》2019年第6期180-185,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61504095);天津市教委科研计划项目(自然科学)(2017ZD06);天津市高等学校创新团队培养计划(TD13-5035)

摘　　要：研究了一种基于高动态范围(HDR)图像的亮度测量方法。基于数码相机的感光特性及成像原理,采用Photosphere软件将一组低动态范围时间序列图像合成为HDR图像,获取该图像的灰度值并与经线性变换得到的3个刺激值RGB数据进行拟合,得到亮度的计算模型,并对3种背景亮度下标准色板各色块亮度进行计算。研究结果表明,3种背景亮度下计算得到的标准色板各色块的亮度平均误差在9.22%以内;随着背景亮度的降低,所有色块目标和彩色目标的亮度误差均减小,灰度目标的亮度误差在背景亮度适中时达到最小。Based on the high dynamic range (HDR) image technology, a calculation method for obtaining the luminance parameters is investigated. In this method, according to the photographic characteristics and the imaging principle of digital cameras, a set of low dynamic range time series images is synthesized into a HDR image using the Photosphere software. The gray value of this image is calculated and fitted with the tristimulus value of R, G, B data obtained by linear transformation. And thus the luminance is obtained. The luminance of each color block in the standard color plate is calculated under three background luminance and it is found that the average luminance error is less than 9.22%. Moreover, the luminance errors of all color block targets and coloured targets are reduced with the decrease of background luminance, and the luminance error of the gray targets reaches a minimum when the background luminance is within an appropriate scope.

关 键 词：机器视觉 高动态范围(HDR)图像 亮度测量 数码相机 

分 类 号：TP391.7[自动化与计算机技术—计算机应用技术]