首页> 外文OA文献 >The properties of multiple CMF determinations using alternative primary sets Part II: A data unification methodology
【2h】

The properties of multiple CMF determinations using alternative primary sets Part II: A data unification methodology

机译:使用替代主要集合的多个CmF确定的属性第II部分:数据统一方法

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

The spectral power values representing Thornton's “alternative primary” PC, NP, and AP colour matching functions (CMF) are compared with the power values representing the 49-observer Stiles–Burch average definition. The Thornton measurements are first converted by matrix transformation into a data set expressed in terms of spectral power at the Stiles–Burch primary wavelengths. Graphs and power ratios are used to compare the definitions for two alternative matches to the same visual stimulus. A triplet of n:n spectral-power ratios (one in each dimension, R, G, and B) is used to quantify the differences between the alternative matches. The relationship between the Thornton PC and Stiles–Burch match-definitions is then found to deviate from the expected power-ratio of 1:1 after matrix transformation. The revealed relationship is an internally consistent and smooth function of matched wavelength, which has a different nonlinear characteristic in each R, G, and B dimension relative to the Stiles–Burch reference model. The “Thornton bow-tie” phenomenon is also demonstrated between a pair of maximum saturation CMF definitions made with alternative primaries. The implicit differences in neutral axis definition represented by the bow-tie diagram are linked to differences in trichromatic unit (T-unit) definition. In this case, the conventional CMF normalization process is postulated to be inaccurate at the wavelengths concerned, resulting in incompatibility between the T-unit definitions of the two primary sets being compared. The conventional N→3 T-unit definition of visual neutrality equating Illuminant SE to a single R:G:B power ratio is extended, by adding an extra N→N mapping to the definition. The resulting N→N→3 mapping is in principle a fully determined redefinition of three-dimensional T-unit equivalence, in which many R:G:B ratios for a comprehensive set of visually neutral metamers can be mapped by N→N transformation onto the conventional single ratio. The effect of N→N mapping is to transform spectral power distributions (SPDs) into spectral effect distributions (SEDs) expressed in T-units. The SPD/SED transform, thus defined, is proposed as a method for unifying CMF determinations made with alternative primaries. The expected outcome is that after transforming SPDs by N→N mapping into SEDs the definitions for all visually matching metamers will be demonstrably interconvertible by matrix product. © 2004 Wiley Periodicals, Inc. Col Res Appl, 29, 438–450, 2004; Published online in Wiley InterScience (www.interscience.wiley.com)
机译:将代表桑顿的“替代主要” PC,NP和AP颜色匹配函数(CMF)的光谱功率值与代表49位观察者Stiles-Burch平均定义的功率值进行比较。首先将Thornton的测量值通过矩阵变换转换为以Stiles-Burch主波长的光谱功率表示的数据集。图形和功率比用于将两个替代匹配的定义与同一视觉刺激进行比较。 n:n频谱功率比的三元组(每个维度分别为R,G和B)用于量化替代匹配之间的差异。然后发现Thornton PC与Stiles-Burch匹配定义之间的关系偏离了矩阵变换后预期的1:1功率比。揭示的关系是匹配波长的内部一致和平滑函数,相对于Stiles–Burch参考模型,在每个R,G和B维度上具有不同的非线性特性。在使用替代原色进行的一对最大饱和CMF定义之间,也显示出“桑顿领结”现象。领结图表示的中性轴清晰度的隐式差异与三色单位(T单位)清晰度的差异相关。在这种情况下,假定常规的CMF归一化过程在相关波长下不准确,导致要比较的两个主要组的T单元定义之间不兼容。通过向定义添加额外的N→N映射,扩展了视觉中立性的传统N→3 T单位定义,将光源SE等同于单个R:G:B功率比。所得的N→N→3映射原则上是对三维T单元等价物的完全确定的重新定义,其中可以通过N→N转换将一整套视觉中性异构体的许多R:G:B比映射到常规的单一比率。 N→N映射的作用是将频谱功率分布(SPD)转换为以T单位表示的频谱效应分布(SED)。提出了这样定义的SPD / SED变换,作为统一使用备用基元进行的CMF确定的方法。预期的结果是,在通过N→N映射将SPD转换为SED之后,所有视觉匹配的同分异构体的定义都可以通过矩阵乘积相互转换。 ©2004 Wiley Periodicals,Inc.版权所有,2004,29,438-450。在线发布于Wiley InterScience(www.interscience.wiley.com)

著录项

  • 作者

    Oulton, David;

  • 作者单位
  • 年度 2004
  • 总页数
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号