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首页> 外文期刊>Journal of Imaging Science and Technology >An angularly and spatially resolved reflectometer for a perceptually adequate characterization of gloss
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An angularly and spatially resolved reflectometer for a perceptually adequate characterization of gloss

机译：角度和空间分辨的反射仪，可在视觉上充分表征光泽

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摘要

Gloss, as has long been known, is a far more complex visual concept than the present methods of instrumental gloss evaluation are able to characterize. The instrumental analyses are either highly oversimplified (standard gloss meters) or oversimplified but with results still difficult to interpret (goniophotometry). The dimensionality and power of the directed reflectance information measured by existing tools is lower and less expressive than the information gained from a direct visual examination of a surface. In this article, a new measurement principle for gloss characterization is presented, aimed to give more comprehensive gloss information, which at the same time has an intuitive interpretation. The integrated optical system is compact and has illumination and receptor devices in fixed positions, which facilitates a mechanically simple realization. The instrument is a goniophotometer with a spatial resolution, but it is restricted to a constant angle between the illumination and the receptor. The measurement yields a "Reflectance Vector Map" (RVM) which is an approximate optical equivalent to the surface measured. The RVM simultaneously contains spatially resolved information about directed reflectance and surface apparent inclination. The resolution is high in both spatial and in angular coordinates. The measurement provides a complex massive data set, which when appropriately visualized is similar to the visual properties of the original surface and thus encourages further evaluation and interpretation. A homogeneity index called "Gloss Angle Smoothness" (GAS) is introduced, derived from the RVM, by weighing perceptually "positive" and "negative" components of gloss. The index correlates well with results obtained by a panel of experienced gloss judges asked to rate gloss homogeneity for the limited but demanding set of black printed paper surfaces tested. The GAS index performs considerably better than a panel of inexperienced judges.
机译：众所周知，光泽度是一种比当前仪器光泽度评估方法能够表征的更为复杂的视觉概念。仪器分析要么过于简化（标准光泽度计），要么过于简化，但结果仍然难以解释（测角光度法）。通过现有工具测量的定向反射率信息的维数和功效比从表面直接目视检查获得的信息要低，并且表现力较低。在本文中，提出了一种新的光泽度测量原理，旨在提供更全面的光泽度信息，同时具有直观的解释。集成光学系统紧凑，在固定位置具有照明和接收器设备，这有助于实现机械上的简单实现。该仪器是具有空间分辨率的测角光度计，但仅限于照明和接收器之间的角度恒定。测量产生“反射向量图”（RVM），其与所测量的表面近似光学等效。 RVM同时包含有关定向反射率和表面视在倾斜度的空间分辨信息。在空间和角度坐标上分辨率都很高。该测量提供了一个复杂的海量数据集，当适当地对其进行可视化时，该数据集类似于原始表面的视觉属性，因此鼓励进行进一步的评估和解释。通过从视觉上称量光泽的“正”和“负”成分，引入了一种称为“光泽角平滑度”（GAS）的均一性指数，该均匀度指数源自RVM。该指数与一组经验丰富的光泽度法官获得的结果高度相关，这些法官要求对有限但要求严格的一组黑色印刷纸表面进行光泽度均匀性评估。 GAS指数的表现要比没有经验的法官小组要好得多。

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