Proceedings ArticleDOI
Color image reproduction based on multispectral and multiprimary imaging: experimental evaluation
Masahiro Yamaguchi,Taishi Teraji,Kenro Ohsawa,Toshio Uchiyama,Hideto Motomura,Yuri Murakami,Nagaaki Ohyama +6 more
TLDR
It is confirmed that the 6-primary display gives improved agreement between the original and reproduced colors, and the color reproduction results with different spectral distributions but same CIE tristimulus value are visually compared.Abstract:
Multispectral imaging is significant technology for the acquisition and display of accurate color information. Natural color reproduction under arbitrary illumination becomes possible using spectral information of both image and illumination light. In addition, multiprimary color display, i.e., using more than three primary colors, has been also developed for the reproduction of expanded color gamut, and for discounting observer metamerism. In this paper, we present the concept for the multispectral data interchange for natural color reproduction, and the experimental results using 16-band multispectral camera and 6-primary color display. In the experiment, the accuracy of color reproduction is evaluated in CIE (Delta) Ea*b* for both image capture and display systems. The average and maximum (Delta) Ea*b* = 1.0 and 2.1 in 16-band mutispectral camera system, using Macbeth 24 color patches. In the six-primary color projection display, average and maximum (Delta) Ea*b* = 1.3 and 2.7 with 30 test colors inside the display gamut. Moreover, the color reproduction results with different spectral distributions but same CIE tristimulus value are visually compared, and it is confirmed that the 6-primary display gives improved agreement between the original and reproduced colors.read more
Citations
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Journal ArticleDOI
Multispectral Chiral Imaging with a Metalens.
Mohammadreza Khorasaninejad,Wei Ting Chen,Alexander Y. Zhu,Jaewon Oh,Jaewon Oh,Robert C. Devlin,David Rousso,David Rousso,Federico Capasso +8 more
TL;DR: This work presents a planar lens with an engineered dispersive response, which simultaneously forms two images with opposite helicity of an object within the same field-of-view, and demonstrates the potential of metasurfaces in realizing a compact and multifunctional device with unprecedented imaging capabilities.
Patent
Color reproduction system
TL;DR: In this paper, a color reproduction system for calculating a display signal by the Lagrange's method of undetermined coefficients or the reduced gradient method was proposed, whereby a signal calculating section (22) minimizes a difference of two squares between a subject spectrum and a display spectrum of a remaining degree of freedom under the constricting condition that the colorimetric value of the subject spectrum calculated by a colourimetric calculated section (21) agrees with that of the display spectrum for a six-elementary-color display.
Book ChapterDOI
Color fundamentals for digital imaging
TL;DR: In this article, the authors highlight some of the fundamentals of color science, colorimetry, color technology, and color systems, and present a progressive introduction of principles from a logical rather than historical perspective.
Journal ArticleDOI
Beyond Red-Green-Blue (RGB) : Spectrum-Based Color Imaging Technology
TL;DR: In this paper, the authors present a comprehensive study on the spectrum-based color reproduction system, called Natural Vision (NV), which aims to break through the limitation of red-green-blue (RGB) three-primary schemes.
Proceedings ArticleDOI
High-fidelity video and still-image communication based on spectral information: Natural Vision system and its applications
Masahiro Yamaguchi,Masahiro Yamaguchi,Hideaki Haneishi,Hideaki Haneishi,Hiroyuki Fukuda,Junko Kishimoto,Hiroshi Kanazawa,Masaru Tsuchida,Ryo Iwama,Nagaaki Ohyama,Nagaaki Ohyama +10 more
TL;DR: This paper summarizes the results of NV project including the development of multispectral and multiprimary imaging technologies and the experimental investigations on the applications to medicine, digital archives, electronic commerce, and computer graphics.
References
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The Gamut of Real Surface Colours
TL;DR: In this article, a maximum gamut for real surface colours has been derived from the analysis of the color coordinates of 4089 samples, and the maximum real-colour gamut was derived in both the CIE 1976 L* u* v* color space and the CIA 1976 L * a* b* colour space.
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Proceedings ArticleDOI
Expanded color gamut reproduced by six-primary projection display
TL;DR: Six-primary color display is presented to reproduce the expanded color Gamut, by using two conventional RGB projectors and six interference filters to maximize the volume of the color gamut in CIE-LUV uniform color space.
Journal ArticleDOI
Color Conversion Method for Multiprimary Display Using Matrix Switching
TL;DR: A color conversion method to reproduce the natural color by additive mixture of multiprimary colors is proposed and the result of the color reproduction is experimentally demonstrated by a six-primary projection display.
Patent
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