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Developing an imaging bi-spectrometer for fluorescent materials.

机译：开发用于荧光材料的成像双光谱仪。

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摘要

Fluorescent effects have been observed for thousands of years. Stokes, in 1852, began the science of fluorescence culminating in his law of fluorescence, which explained that fluorescence emission occurs at longer wavelengths than the excitation wavelength. This phenomenon is observed extensively in the art world. Daylight fluorescent colors known as Day-GloRTM have become an artistic medium since the 1960s. Modern artists exploit these saturated and brilliant colors to glitter their painting.;Multipsectral imaging as a noninvasive technique has been used for archiving by museums and cultural-heritage institutions for about a decade. The complex fluorescence phenomenon has been often ignored in the multispectral projects. The ignored fluorescence results in errors in digital imaging of artwork containing fluorescent colors. The illuminant-dependency of the fluorescence radiance makes the fluorescence colorimetry and consequently spectral imaging more complex.;In this dissertation an abridged imaging bi-spectrometer for artwork containing both fluorescent and non-fluorescent colors was developed. The method developed included two stages of reconstruction of the spectral reflected radiance factor and prediction of the fluorescent radiance factor. The estimation of the reflected radiance factor as a light source independent component was achieved by imaging with a series of short-wavelength cutoff filters placed in the illumination path. The fluorescent radiance factor, a light source dependent component, was estimated based on a proposed model, the abridged two-monochromator method. The abridged two-monochromator method was developed for reconstructing the bi-spectral matrix of a fluorescent color based on a calibrated UV-fluorescence imaging. In this way, one could predict the fluorescence radiance factor under any desired illuminant and consequently a better color evaluation and rendering could be obtained. Furthermore, this method easily fitted in a general system for spectral imaging of paintings containing both fluorescent and non-fluorescent colors. The abridged two-monochromator method could predict fluorescent radiance factor of a fluorescent color via prediction of the true emission and the number of absorbed quanta by a fluorescing specimen for a given viewing light source. The superiority of the abridged fluorescence spectral imaging to the traditional spectral and colorimetric imaging for a few light sources was confirmed using fluorescent and non-fluorescent targets. Additionally, an exploratory visual experiment using a paired-comparison method was performed to evaluate the performance of the abridged fluorescence spectral imaging in comparison to the traditional spectral and colorimetric imaging for rendering images of a reference painting. The abridged fluorescence spectral imaging had better performance than traditional spectral and colorimetric imaging in rendering images for daylight.
机译：数千年来一直观察到荧光效应。斯托克斯（Stokes）在1852年以他的荧光定律开始了荧光科学的高潮，该定律解释了荧光发射发生在比激发波长更长的波长处。这种现象在艺术界被广泛观察到。自1960年代以来，被称为Day-GloRTM的日光荧光色已成为一种艺术媒介。现代艺术家利用这些饱和和鲜艳的色彩使它们的画作闪闪发光。多视点成像作为一种非侵入性技术已被博物馆和文化遗产机构用于归档。在多光谱项目中，通常忽略了复杂的荧光现象。忽略的荧光会导致包含荧光色的艺术品的数字成像出现错误。荧光辐射强度与光源的依赖关系使荧光比色法和光谱成像更加复杂。本文针对含荧光和非荧光颜色的艺术品开发了一种简化的成像双光谱仪。开发的方法包括光谱反射辐射因子的重建和荧光辐射因子预测的两个阶段。通过使用放置在照明路径中的一系列短波长截止滤光器进行成像，可以估算出作为光源独立组件的反射辐射因子。荧光辐射因子，一种依赖于光源的成分，是基于提出的模型（简化的二单色仪方法）估算的。开发了一种简化的双单色仪方法，用于基于校准的UV荧光成像重建荧光色的双光谱矩阵。通过这种方式，可以预测任何所需光源下的荧光辐射系数，因此可以获得更好的色彩评估和渲染效果。此外，该方法很容易安装在用于包含荧光和非荧光颜色的绘画光谱成像的通用系统中。简化的二单色仪方法可以通过预测给定观察光源的真实发射和荧光样品吸收的量子数量来预测荧光色的荧光辐射系数。使用荧光和非荧光靶标证实了对于某些光源而言，简化的荧光光谱成像优于传统的光谱和比色成像。此外，与配对参考绘画的传统光谱和比色成像相比，使用配对比较方法进行了探索性视觉实验，以评估简化荧光光谱成像的性能。简化的荧光光谱成像在渲染日光图像方面比传统的光谱和比色成像具有更好的性能。

著录项

  • 作者

    Mohammadi, Mahnaz.;

  • 作者单位

    Rochester Institute of Technology.;

  • 授予单位 Rochester Institute of Technology.;
  • 学科 Engineering Electronics and Electrical.;Physics Optics.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 331 p.
  • 总页数 331
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;光学;
  • 关键词

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