Multispectral color image capture using a liquid crystal tunable filter

Hardeberg, Jon Yngve; Schmitt, Francis; Brettel, Hans

doi:10.1117/1.1503346

Cited by 207 publications

(23 citation statements)

References 32 publications

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“…The black reference image provided an estimation of the dark current noise of the CCD camera and was obtained in the dark room with the sample holder empty, with the same exposure times as in the white reference image and with the light source off. The reflectance factor [2] was therefore calculated using the standard two-point correction [4,5]. The wavelength range between 400 and 718 nm was sampled at 6-nm intervals.…”

Section: Methodsmentioning

confidence: 99%

“…Hyperspectral imaging is a common spectroscopy technique in non-invasive sensing analysis. From a stack of images taken at a series of narrow-bandwidth wavelengths, hyperspectral imaging provides a three-dimensional array or "image cube," with two spatial dimensions and the third the spectral axis [4,5]. In comparison with multispectral methods, in hyperspectral imaging the distance between adjacent wavelengths is less than the spectral bandwidth providing the continuous spectral reflectance function pixel by pixel.…”

Section: Introductionmentioning

confidence: 99%

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Hyperspectral optical imaging of two different species of lepidoptera

2011

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In this article, we report a hyperspectral optical imaging application for measurement of the reflectance spectra of photonic structures that produce structural colors with high spatial resolution. The measurement of the spectral reflectance function is exemplified in the butterfly wings of two different species of Lepidoptera: the blue iridescence reflected by the nymphalid Morpho didius and the green iridescence of the papilionid Papilio palinurus. Color coordinates from reflectance spectra were calculated taking into account human spectral sensitivity. For each butterfly wing, the observed color is described by a characteristic color map in the chromaticity diagram and spreads over a limited volume in the color space. The results suggest that variability in the reflectance spectra is correlated with different random arrangements in the spatial distribution of the scales that cover the wing membranes. Hyperspectral optical imaging opens new ways for the non-invasive study and classification of different forms of irregularity in structural colors.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hyperspectral optical imaging of two different species of lepidoptera

2011

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“…In some methods, fish-eye-lenses have been applied to improve the spatial and temporal resolution at the cost of a low spectral resolution [25][26][27]. Although some filtering methods have been introduced to improve the spectral resolution of such systems [28,29], the improved spectral resolution is lower compared to measurements with spectroradiometers.…”

Section: Introductionmentioning

confidence: 99%

A multidirectional spectral measurement method and instrument to investigate non-image-forming effects of light

Khademagha

Aries

Rosemann

et al. 2018

Meas. Sci. Technol.

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DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal. If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement:

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“…[1][2][3][4][5] In these methods, the colors of objects are accurately obtained by multiband imaging technologies, and the images are reproduced on displays with high color fidelity based on adequate calibration procedures for display systems. However, it is physically impossible to accurately reproduce the luster of objects, because luster usually has a significant luminance.…”

Section: Introductionmentioning

confidence: 99%

Fidelity evaluation of metallic luster in six-band high-dynamic-range imaging

Murakami

Jin

Manabu

et al. 2012

OPT REV

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This paper presents subjective evaluation results for images reproducing metallic luster. The images were produced by a six-band high-dynamic-range imaging technique, which provides high color fidelity and the capability of various tone mapping operations. The preferences for images produced by four kinds of tone mapping operations were evaluated by means of a paired comparison method under the conditions that observers could or could not refer to real scenes. The evaluation results indicated that preferences for images depend on tone mapping operations, especially for objects that have the luster changing over a large area with moderately high intensity. In addition, when referring to a real scene, the spatially varying tone compression, which reproduces the color and complex characteristics of metallic luster, was significantly preferable to the tone mappings by other approaches. Without a real scene, the preference was also strong for images produced by simply saturating pixel values at highlights. #

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Multispectral color image capture using a liquid crystal tunable filter

Cited by 207 publications

References 32 publications

Hyperspectral optical imaging of two different species of lepidoptera

Hyperspectral optical imaging of two different species of lepidoptera

A multidirectional spectral measurement method and instrument to investigate non-image-forming effects of light

Fidelity evaluation of metallic luster in six-band high-dynamic-range imaging

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