您目前的位置: 首页» 论文成果» 李长军《Accurate Method for Computing Correlated Color Temperature》

李长军《Accurate Method for Computing Correlated Color Temperature》

 
英文题目:Accurate Method for Computing Correlated Color Temperature

中文题目:一种计算相关色温的准确方法

第一作者:李长军

我校署名:第一单位

所属单位:电子与信息工程学院

项目来源:国家自然科学基金项目

刊物名称:OPTICS EXPRESS  卷: 24  期: 13  页: 14066-14078  出版年: JUN 27 2016

刊物类别:国际期刊

Web of Science 类别:Optics

研究方向:Optics

Impact factor(2015):3.15

JCR分区:Q1

摘要:For the correlated color temperature (CCT) of a light source to be estimated, a nonlinear optimization problem must be solved. In all previous methods available to compute CCT, the objective function has only been approximated, and their predictions have achieved limited accuracy. For example, different unacceptable CCT values have been predicted for light sources located on the same isotemperature line. In this paper, we propose to compute CCT using the Newton method, which requires the first and second derivatives of the objective function. Following the current recommendation by the International Commission on Illumination (CIE) for the computation of tristimulus values (summations at 1 nm steps from 360 nm to 830 nm), the objective function and its first and second derivatives are explicitly given and used in our computations. Comprehensive tests demonstrate that the proposed method, together with an initial estimation of CCT using Robertson's method <jrn>[J. Opt. Soc. Am. 58, 1528-1535 (1968)]</jrn>, gives highly accurate predictions below 0.0012 K for light sources with CCTs ranging from 500 K to 10(6) K. (C) 2016 Optical Society of America.