&lt;title&gt;Principles of bispectral fluorescence colorimetry&lt;/title&gt;

Leland, James E.; Johnson, Norbert; Arecchi, Angelo V.

doi:10.1117/12.284094

Cited by 13 publications

(10 citation statements)

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“…We assume that the surface is Lambertian. For non-Lambertian surfaces, a more thorough but straightforward mathematical treatment would be required (Leland et al 1997). We also assume that the addition of the fluorescent pigment does not produce a significant change in the reflectance.…”

Section: Laboratory Measurement Of Fluorescence Efficiency-mentioning

confidence: 99%

“…We use the term here to denote the flux leaving a coral surface under ambient illumination (S). The exitance in this case is the sum of the reflected and fluoresced components (Grum 1980;Leland et al 1997;Fuchs 2001), where the reflected portion at any wavelength is the product of the reflectance and the incident irradiance.…”

Section: Laboratory Measurement Of Fluorescence Efficiency-mentioning

confidence: 99%

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Contribution of fluorescence to the spectral signature and perceived color of corals

Mazel

Fuchs

2003

Limnology & Oceanography

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Solar-induced fluorescence from pigments in the host tissues of reef corals can make a significant contribution to their spectral signature and can affect their apparent color as perceived by a human observer. The relative magnitudes of the reflectance and fluorescence contributions to the spectrum can vary as a function of illumination conditions. We have combined measured coral reflectance and fluorescence spectra with modeled downwelling spectral irradiances to investigate the contribution of fluorescence to coral spectra and color. Variations in depth, fluorescence efficiency, and solar zenith angle were modeled. Fluorescence enhancement is greatest when the coral absorbs light at wavelengths that are transmitted well by seawater and emits light efficiently at wavelengths that are moderately attenuated. The methodology provides a means of predicting the combined reflectance and fluorescence spectral signatures and perceived colors of fluorescent corals under arbitrary illumination conditions.

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Section: Laboratory Measurement Of Fluorescence Efficiency-mentioning

confidence: 99%

Section: Laboratory Measurement Of Fluorescence Efficiency-mentioning

confidence: 99%

Contribution of fluorescence to the spectral signature and perceived color of corals

Mazel

Fuchs

2003

Limnology & Oceanography

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“…The conventional approach to capturing this relationship is to exhaustively measure different combinations of absorbing and emitting wavelengths [11]. This is labor intensive and only works for a single surface point.…”

Section: Introductionmentioning

confidence: 99%

Reflectance and Fluorescent Spectra Recovery Based on Fluorescent Chromaticity Invariance under Varying Illumination

Lam

Yasuyuki³

et al. 2014

2014 IEEE Conference on Computer Vision and Pattern Recognition

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In recent years, fluorescence analysis of scenes has received attention. Fluorescence can provide additional information about scenes, and has been used in applications such as camera spectral sensitivity estimation, 3D reconstruction, and color relighting. In particular, hyperspectral images of reflective-fluorescent scenes provide a rich amount of data. However, due to the complex nature of fluorescence, hyperspectral imaging methods rely on specialized equipment such as hyperspectral cameras and specialized illuminants. In this paper, we propose a more practical approach to hyperspectral imaging of reflectivefluorescent scenes using only a conventional RGB camera and varied colored illuminants. The key idea of our approach is to exploit a unique property of fluorescence: the chromaticity of fluorescence emissions are invariant under different illuminants. This allows us to robustly estimate spectral reflectance and fluorescence emission chromaticity. We then show that given the spectral reflectance and fluorescent chromaticity, the fluorescence absorption and emission spectra can also be estimated. We demonstrate in results that all scene spectra can be accurately estimated from RGB images. Finally, we show that our method can be used to accurately relight scenes under novel lighting.

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“…A unique 3-step calibration procedure excludes the cross talk between the two integrating spheres through the port connecting them. 8,9 After calibration, the uncertainly of this system for total RF measurement for each integrating sphere is approximately AE2%.…”

Section: Phosphor Sample Characterizationmentioning

confidence: 99%

“…1. 8,9 The system consists of control and data acquisition software, a xenon lamp light source (A), a monochrometer (B) for controlling the spectra bandwidth *Address all correspondence to: Huiying Wu, E-mail: hollywu@micron.com of the incident light, a reference detector for monitoring incident light (D), two 8 in. integrating sphere (E1 and E2) and two spectro-radiometers [G1 and G2, with G1 to measure the integrated spectral power distribution (SPD) of backward (reflected) light and G2 to collect the SPD of forward (transmitted) light].…”

Section: Double Integrating Sphere Measurement Systemmentioning

confidence: 99%

Phosphor modeling and characterization

Jenkins

2014

Opt. Eng

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Abstract. The prevalent method to develop a phosphor recipe (based on trial and error) to create white light with a blue light-emitting diode (LED) is time-consuming. We developed a new method for determining parametric values in a simulated phosphor model through systematic testing of phosphor samples and optimizing the parameter values with ray-trace software. The model employs Mie volume scattering together with absorption and down-conversion. A double-integrating sphere spectral measurement system was constructed to perform phosphor characterization. It was used to characterize a YAG phosphor over a wide range of phosphor concentrations and thicknesses. The final phosphor model was proven to accurately predict the phosphor performance. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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<title>Principles of bispectral fluorescence colorimetry</title>

Cited by 13 publications

References 0 publications

Contribution of fluorescence to the spectral signature and perceived color of corals

Contribution of fluorescence to the spectral signature and perceived color of corals

Reflectance and Fluorescent Spectra Recovery Based on Fluorescent Chromaticity Invariance under Varying Illumination

Phosphor modeling and characterization

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