Dr. Yasuyo G. Ichihara Profile

Dr. Yasuyo G. Ichihara

Associate Professor at Kogakuin Univ

SPIE Involvement:

Author

Proceedings Article | 8 February 2015 Paper

Clarifying color category border according to color vision

Takumi Ichihara, Yasuyo Ichihara

Proceedings Volume 9395, 93950W (2015) https://doi.org/10.1117/12.2077060

KEYWORDS: Color vision, CIE 1931 color space, Optical engineering, Data conversion, Information science, Color imaging, Electronic imaging, Current controlled current source, Chromium, Eye

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Proceedings Article | 4 February 2013 Paper

Color universal design: analysis of color category dependency on color vision type (4)

Tomohiro Ikeda, Yasuyo Ichihara, Natsuki Kojima, Hisaya Tanaka, Kei Ito

Proceedings Volume 8652, 86520G (2013) https://doi.org/10.1117/12.2001582

KEYWORDS: Color vision, Light sources, Information visualization, Color difference, Analytical research, Visualization, Product engineering, Cognition, Information science, Visual communications

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This report is af ollow-up to SPIE-IS+T / Vol. 7528 7528051-8, SPIE-IS+T / Vol. 7866 78660J-1-8 and SPIE-IS+T / Vol. 8292 829206-1-8. Colors are used to communicate information in various situations, not just for design and apparel. However, visual information given only by color may be perceived differently by individuals with different color vision types. Human color vision is non-uniform and the variation in most cases is genetically linked to L-cones and M-cones. Therefore, color appearance is not the same for all color vision types. Color Universal Design is an easy-to-understand system that was created to convey color-coded information accurately to most people, taking color vision types into consideration. In the present research, we studied trichromat (C-type), prolan (P-type), and deutan (D-type) forms of color vision. We here report the result of two experiments. The first was the validation of the confusion colors using the color chart on CIELAB uniform color space. We made an experimental color chart (total of color cells is 622, the color difference between color cells is 2.5) for fhis experiment, and subjects have P-type or D-type color vision. From the data we were able to determine "the limits with high probability of confusion" and "the limits with possible confusion" around various basing points. The direction of the former matched with the theoretical confusion locus, but the range did not extend across the entire a* range. The latter formed a belt-like zone above and below the theoretical confusion locus. This way we re-analyzed a part of the theoretical confusion locus suggested by Pitt-Judd. The second was an experiment in color classification of the subjects with C-type, P-type, or D-type color vision. The color caps of fhe 100 Hue Test were classified into seven categories for each color vision type. The common and different points of color sensation were compared for each color vision type, and we were able to find a group of color caps fhat people with C-, P-, and D-types could all recognize as distinguishable color categories. The result could be used as the basis of a color scheme for future Color Universal Design.

Proceedings Article | 25 January 2012 Paper

Color universal design: analysis of color category dependency on color vision type (3)

Natsuki Kojima, Yasuyo Ichihara, Tomohiro Ikeda, Miyuki Kamachi, Kei Ito

Proceedings Volume 8292, 829206 (2012) https://doi.org/10.1117/12.907669

KEYWORDS: Color vision, Color difference, Adaptive optics, Printing, Visualization, Lighting standards, Manufacturing, Inkjet technology, Information science, Visual communications

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Proceedings Article | 25 January 2011 Paper

Color universal design: analysis of color category dependency on color vision type (2)

Natsuki Kojima, Miyuki Kamachi, Yasuyo Ichihara, Kei Ito

Proceedings Volume 7866, 78660J (2011) https://doi.org/10.1117/12.872168

KEYWORDS: Color vision, Adaptive optics, Visual communications, Printing, Eye, Lighting standards, Manufacturing, Information science, Roads, Cones

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Proceedings Article | 19 January 2010 Paper

Color Universal Design: analysis of color category dependency on color vision type

Yasuyo Ichihara, Natsuki Kojima, Kei Ito

Proceedings Volume 7528, 752805 (2010) https://doi.org/10.1117/12.838802

KEYWORDS: Color vision, Information visualization, Visualization, Visual communications, Printing, Eye, Warning signs, Genetics, Glasses, Lighting standards

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Proceedings Article | 19 January 2009 Paper

Color universal design, the optimal representation of the color red for protan-vision people: practical alternatives from the color universal design organization

Yasuyo Ichihara, Masataka Okabe, Koichi Iga, Yosuke Tanaka, Kohei Musha, Kei Ito

Proceedings Volume 7241, 72410J (2009) https://doi.org/10.1117/12.805731

KEYWORDS: Color vision, Visual communications, Molecular biology, Light sources and illumination, Visualization, Information science, Cell biology, Biology, Medicine, Heart

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Proceedings Article | 28 January 2008 Paper

Color universal design: the selection of four easily distinguishable colors for all color vision types

Yasuyo Ichihara, Masataka Okabe, Koichi Iga, Yosuke Tanaka, Kohei Musha, Kei Ito

Proceedings Volume 6807, 68070O (2008) https://doi.org/10.1117/12.765420

KEYWORDS: Color vision, Visual communications, Information science, Medicine, Product engineering, Genetics, Color imaging, Electronic imaging, Light sources and illumination, Prototyping

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Proceedings Article | 16 January 2006 Paper

Color constancy in Japanese animation

Yasuyo Ichihara

Proceedings Volume 6058, 60580C (2006) https://doi.org/10.1117/12.639253

KEYWORDS: Skin, Brain, Human vision and color perception, Sun, Cameras, Dubnium, Color vision, Neuroimaging, Color imaging, Electronic imaging

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Proceedings Article | 6 June 2002 Paper

Difference between seeing a random color dot picture and reading shapes from the same color dot picture in the Ishihara pseudoisochromatic plates

Yasuyo Ichihara, Satoshi Nakadomari, Hiroaki Takeuchi, Satoru Miyauchi, Kenji Kitahara

Proceedings Volume 4421, (2002) https://doi.org/10.1117/12.464765

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Proceedings Article | 30 May 2002 Paper

Retinex processing from the fMRI study on V4: artistic research of colored picture using functional MRI

Yasuyo Ichihara, Satoshi Nakadomari, Hiroaki Takeuchi, Satoru Miyauchi, Kenji Kitahara

Proceedings Volume 4662, (2002) https://doi.org/10.1117/12.469541

KEYWORDS: Functional magnetic resonance imaging, Camouflage, Brain, Clouds, Colorimetry, Visualization, Magnetic resonance imaging, Color centers, Scanning probe microscopy, Color vision

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Proceedings Article | 20 December 2001 Paper

Research and improving web accessibility in Japan

Hitoshi Uchida, Masaya Ando, Kenji Ohta, Hirokazu Shimizu, Yoshio Hayashi, Yasuyo Ichihara, Ryoji Yamazaki

Proceedings Volume 4672, (2001) https://doi.org/10.1117/12.452687

KEYWORDS: Internet, Telecommunications, Inspection, Standards development, Brain, Visualization, Switches, Neuroimaging, Internet imaging, Software development

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Proceedings Article | 27 December 2000 Paper

What do you see in a digital color dot picture such as the Ishihara pseudo-isochromatic plates? Web Accessibility Palette (WAP)

Yasuyo Ichihara

Proceedings Volume 4311, (2000) https://doi.org/10.1117/12.411916

KEYWORDS: Color vision, Internet imaging, Visual communications, Digital color imaging, Reflectivity, Electronic imaging, Visualization, Electroluminescence, Colorimetry, Eye

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