Prof. Hirotsugu Yamamoto Profile

Prof. Hirotsugu Yamamoto

Professor at Utsunomiya Univ.

SPIE Involvement:

Conference Program Committee | Author

Area of Expertise:

Secure display , Information photonics , Visual perception , 3D display , Nanophotonics , Human interface

Profile Summary

HirotsuguYamamoto received the B.E., M.E., and Ph.D. degrees from the Universityof Tokyo, Tokyo, Japan. After graduation, he joined The University of Tokushima, Tokushima, Japan, where he is currently a Lecturer at the Department of Optical Science and Technology. His recent work activities have included large 3D displays using LED panels, secure displays by using visual cryptography, and applications of nanophotonics and optical computing for emerging information communications technologies.
Dr. Yamamoto received Young Scientist Award for the Presentation of an Excellent Paper, The Japan Society of Applied Physics, Outstanding Poster Paper Award at IDW'03, IDW'04, IDW'07, IDW'08, IDW'09, and IDW'10, and the Gennai Prize from the Ozaki Foundation of Japan.

Publications (57)

Proceedings Article | 7 June 2024 Poster + Paper

Poster + Paper

Complementation by binocular vision about aerial image missing by monocular vision in AIRR with a gap between retro-reflectors

Takeru Nishiyama, Shiro Suyama, Hirotsugu Yamamoto

Proceedings Volume 13041, 130410M (2024) https://doi.org/10.1117/12.3013962

KEYWORDS: Retroreflectors, Binocular vision, Eye, Light sources, Beam splitters, Airborne remote sensing, Reflection, Visualization, Infrared imaging, Image transmission

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Proceedings Article | 13 March 2024 Poster + Paper

Poster + Paper

Reconstruction of aerial image just around viewing eyes for ultra-wide field-of-view display

Hiroki Takatsuka, Takumi Watanabe, Shiro Suyama, Munekazu Date, Hirotsugu Yamamoto

Proceedings Volume 12909, 129090Q (2024) https://doi.org/10.1117/12.3008948

KEYWORDS: Image restoration, Retroreflectors, Beam splitters, Stereoscopic cameras, Airborne remote sensing, Light sources, Retina, Reflection, Prototyping, Image sensors

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Proceedings Article | 13 March 2024 Presentation

Presentation

Aerial display by use of plane-symmetric real-image forming optics and its modulation transfer function

Hirotsugu Yamamoto, Kazuaki Takiyama, Kenichiro Masaoka, Shiro Suyama

Proceedings Volume 12909, 129090J (2024) https://doi.org/10.1117/12.3008945

KEYWORDS: Modulation transfer functions, Microlens array, Retroreflectors, Reflectors, Micromirrors, Interfaces, Augmented reality

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Proceedings Article | 5 October 2023 Presentation

Presentation

Snapshot full Stokes camera by RGB polarization camera

Yukitoshi Otani, Nobuaki Endo, Nathan Hagen, Atsushi Ito, Hirotsugu Yamamoto

Proceedings Volume PC12690, PC126900B (2023) https://doi.org/10.1117/12.2681429

KEYWORDS: Cameras, RGB color model, Polarization, Imaging systems, Wave plates, Video, Microscopes, Interferometry, Imaging arrays, Calibration

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Proceedings Article | 8 December 2022 Paper

Paper

Automatic identification of tiger puffer in an aquaculture tank using deep learning

Atsushi Ito, Yusuke Fukushima, Hirotsugu Yamamoto, Yukitoshi Otani, Shiro Suyama, Masaki Yasugi, Yasutoshi Yoshiura

Proceedings Volume 12480, 124800H (2022) https://doi.org/10.1117/12.2660183

KEYWORDS: Virtual reality, Biology, Video, Imaging systems, Data modeling, Cameras, Airborne remote sensing, System identification, Scientific research, Retroreflectors

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Proceedings Article | 20 May 2020 Presentation + Paper

Presentation + Paper

Depth-fused 3D display by aerial display coated flat-panel display

Y. Terashima, S. Suyama, H. Yamamoto

Proceedings Volume 11402, 1140207 (2020) https://doi.org/10.1117/12.2559279

KEYWORDS: 3D displays, Reflectivity, Polarizers, 3D image processing, Eye, Retroreflectors, Light sources, Optical design, Mirrors

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Proceedings Article | 11 May 2020 Paper

Paper

Immersive aerial interface showing transparent floating screen between users and audience

Masaki Yasugi, Hirotsugu Yamamoto, Yukihiro Takeda

Proceedings Volume 11402, 114020O (2020) https://doi.org/10.1117/12.2557987

KEYWORDS: Retroreflectors, Beam splitters, Light emitting diodes

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Proceedings Article | 4 May 2020 Presentation

Presentation

Aerial 3D shaped display with AIRR and aerial hollow-face illusion (Conference Presentation)

Hirotsugu Yamamoto, Nao Kurokawa

Proceedings Volume 11402, 114020M (2020) https://doi.org/10.1117/12.2559789

KEYWORDS: 3D displays, Light sources, 3D image processing, Retroreflectors, Beam splitters, Projection systems, Airborne remote sensing, Light, Eye

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Proceedings Article | 30 March 2020 Presentation

Presentation

Laser scanning optical-frequency-comb microscopy for multivariate measurement related to amplitude and phase (Conference Presentation)

Takeo Minamikawa, Shota Nakano, Eiji Hase, Akifumi Asahara, Hidenori Koresawa, Takahiko Mizuno, Hirotsugu Yamamoto, Kaoru Minoshima, Takeshi Yasui

Proceedings Volume 11351, 113510B (2020) https://doi.org/10.1117/12.2554983

Read Abstract +

Laser-scanning optical microscopy is widely used for the observation of microstructures and the analysis of molecular functions of samples with tightly focused light. Spectroscopic information is also available if a broadband light source is employed. General laser-scanning optical microscopy observes optical intensity by employing a sample- or laser-scanning system for the analysis of samples via reflectance, scattering, absorbance, and laser-induced phenomena. Another visualization method is using optical phase, which can enhance the image contrast of such high transparent materials and nano-step structures. However, broadband spectroscopic phase-contrast imaging with a laser-scanning configuration is slightly tricky due to the interferometric configuration is required to retrieve phase information of each wavelength. If the simultaneous measurement of amplitude and phase spectra is enabled in laser-scanning microscopy, it is possible to realize multivariate measurement to analyze more detailed information of samples based on such as complex refractive index, polarization characteristics, and so on with tightly focused light. To overcome these limitations, in this study, we proposed an optical-frequency-comb (OFC)-based laser scanning optical microscopy. The OFC technique enables fast Fourier transform spectroscopy by using well-defined two OFC lasers without any mechanical scan in the time domain. The combination of the laser scanning optical microscopy and the OFC technique realized the simultaneous and spectroscopic observation of quantitative amplitude and phase images with tight focusing down to the diffraction limit. Furthermore, we realized the analysis of polarization by the direct observation of the amplitude and phase of the orthogonal components. We applied the proposed method to the observation of nano-step structures, phase objects and anisotropic materials to provide a proof-of-principle demonstration of the proposed method. Our proposed approach will serve as a unique and powerful tool for characterizing the materials via complete characterization of optical information such as amplitude, phase, polarization and spectrum.

Proceedings Article | 14 May 2019 Paper

Paper

Aquatic information display and its applications for behavioral biology experiments

Hirotsugu Yamamoto, Erina Abe, Masaki Yasugi, Eiji Watanabe, Hideaki Takeuchi

Proceedings Volume 10997, 1099707 (2019) https://doi.org/10.1117/12.2521225

KEYWORDS: Water, Beam splitters, Retroreflectors, Biology, LCDs, Light sources, Light, Mirrors, Light emitting diodes

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Proceedings Article | 14 May 2019 Paper

Paper

Capturing of a light field image and its real-time aerial reconstruction with AIRR

Kengo Fujii, Kazuki Shimose, Mitsuru Ito, Masao Nakajima, Toru Iwane, Masaki Yasugi, Hirotsugu Yamamoto

Proceedings Volume 10997, 109970G (2019) https://doi.org/10.1117/12.2522639

KEYWORDS: Cameras, 3D image processing, Retroreflectors, Imaging systems, 3D displays, 3D image reconstruction, Beam splitters, Polarizers

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Proceedings Article | 4 March 2019 Paper

Paper

Scan-less confocal phase imaging of biological samples using dual-comb microscopy

Takuya Tsuda, Takahiko Mizuno, Eiji Hase, Takeo Minamikawa, Hirotsugu Yamamoto, Takeshi Yasui

Proceedings Volume 10889, 108891B (2019) https://doi.org/10.1117/12.2509244

KEYWORDS: Confocal microscopy, Phase imaging, Frequency combs

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Proceedings Article | 1 March 2019 Paper

Paper

Wide axial dynamic range digital holography using multicascade-linked synthetic wavelengths and optical wavelength

M. Yamagiwa, T. Minamikawa, C. Trovato, T. Ogawa, D. G. Ibrahim, Y. Kawahito, R. Oe, K. Shibuya, T. Mizuno, E. Abraham, Y. Mizutani, T. Iwata, H. Yamamoto, K. Minoshima, T. Yasui

Proceedings Volume 10944, 1094414 (2019) https://doi.org/10.1117/12.2509354

KEYWORDS: Beam splitters, 3D image processing, Image resolution, Rubidium, Continuous wave operation, Polarization

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Proceedings Article | 16 May 2018 Paper

Paper

Forming aerial 3D images with smooth motion parallax in combination of arc 3D display with AIRR

Hirotsugu Yamamoto, Kazuki Kawai, Haruki Mizushina, Shiro Suyama

Proceedings Volume 10666, 106660I (2018) https://doi.org/10.1117/12.2309903

KEYWORDS: 3D displays, Retroreflectors, 3D image processing, Light scattering

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Proceedings Article | 24 April 2018 Paper

Paper

Application of scan-less two-dimensional confocal microscopy achieved by a combination of confocal slit with wavelength/space conversion

Eiji Hase, Takeo Minamikawa, Shuji Miyamoto, Yasuhiro Mizutani, Tetsuo Iwata, Hirotsugu Yamamoto, Takeshi Yasui

Proceedings Volume 10711, 107111O (2018) https://doi.org/10.1117/12.2318671

KEYWORDS: Confocal microscopy, Objectives, Spatial resolution, Spectroscopy, Biomedical optics, Image acquisition, Imaging systems

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Proceedings Article | 24 April 2018 Paper

Paper

Scan-less, line-filed, confocal phase imaging with dual-comb microscopy

Eiji Hase, Takeo Minamikawa, Shuji Miyamoto, Yasuhiro Mizutani, Tetsuo Iwata, Hirotsugu Yamamoto, Takeshi Yasui

Proceedings Volume 10711, 1071120 (2018) https://doi.org/10.1117/12.2317029

KEYWORDS: Confocal microscopy, Microscopy, Phase imaging, Optical microscopy, Spectroscopy, Frequency combs

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Proceedings Article | 20 February 2018 Paper

Paper

Dual-comb single-pixel imaging in both amplitude and phase

Kyuki Shibuya, Takeo Minamikawa, Yasuhiro Mizutani, Hirotsugu Yamamoto, Takeshi Yasui, Tetsuo Iwata

Proceedings Volume 10505, 105050Y (2018) https://doi.org/10.1117/12.2288709

KEYWORDS: Imaging spectroscopy, Hyperspectral imaging, Spectroscopy, Chromium, Coating, Sensors, Spatial resolution, Fabry–Perot interferometers, Spectral resolution, Polarization

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Proceedings Article | 20 February 2018 Paper

Paper

Video-rate confocal phase imaging by use of scan-less dual comb microscopy

Takahiko Mizuno, Eiji Hase, Takeo Minamikawa, Hirotsugu Yamamoto, Takeshi Yasui

Proceedings Volume 10505, 1050508 (2018) https://doi.org/10.1117/12.2289231

KEYWORDS: Confocal microscopy, Phase imaging, Microscopy, Optical microscopy, Image resolution, Spectroscopy

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Proceedings Article | 26 June 2017 Paper

Paper

Calibration between a 3D camera and an aerial information screen

Shusei Ito, Nao Kurokawa, Hirotsugu Yamamoto

Proceedings Volume 10335, 103351S (2017) https://doi.org/10.1117/12.2270469

KEYWORDS: Software development, Calibration, Cameras, Polarizers, Stereoscopic cameras, Reflectivity, Gesture recognition, Retroreflectors, Imaging systems, 3D displays, Reflective displays

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Proceedings Article | 26 June 2017 Paper

Paper

Aerial 3D display by use of a 3D-shaped screen with aerial imaging by retro-reflection (AIRR)

Nao Kurokawa, Shusei Ito, Hirotsugu Yamamoto

Proceedings Volume 10335, 103351K (2017) https://doi.org/10.1117/12.2269494

KEYWORDS: Light sources, Software development, 3D image processing, Retroreflectors, 3D displays, Projection systems, Optical design, Reflectivity, Polarizers, Airborne remote sensing

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Proceedings Article | 22 February 2017 Presentation + Paper

Presentation + Paper

Scanless confocal phase imaging with dual comb microscopy

Eiji Hase, Takeo Minamikawa, Shuji Miyamoto, Hirotsugu Yamamoto, Takeshi Yasui

Proceedings Volume 10076, 100760X (2017) https://doi.org/10.1117/12.2251113

KEYWORDS: Confocal microscopy, Spectroscopy, Phase imaging, Microscopy, Frequency combs, Infrared imaging, Infrared spectroscopy, Objectives, Spectrographs, Beam splitters, Radio optics, Mode locking, Frequency metrology

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Proceedings Article | 16 February 2017 Paper

Paper

Aerial secure display by use of polarization-processing display with retarder film and retro-reflector

Shusei Ito, Keitaro Uchida, Haruki Mizushina, Shiro Suyama, Hirotsugu Yamamoto

Proceedings Volume 10126, 101260O (2017) https://doi.org/10.1117/12.2251789

KEYWORDS: Information security, LCDs, Retroreflectors, Polarization, Airborne remote sensing, Wave plates, Computer security, Polarizers, Contamination, Reflectivity, Modulation

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Proceedings Article | 16 February 2017 Paper

Paper

Hybrid display of static image and aerial image by use of transparent acrylic cubes and retro-reflectors

Shogo Morita, Shusei Ito, Hirotsugu Yamamoto

Proceedings Volume 10126, 101260P (2017) https://doi.org/10.1117/12.2251847

KEYWORDS: Light, Light sources, Retroreflectors, Airborne remote sensing, Image resolution, Steganography, Virtual reality, Augmented reality, Display technology, Beam splitters, Light sources and illumination, Light emitting diodes, LED displays, LED lighting, Reflectors

Read Abstract +

Proceedings Article | 7 March 2016 Paper

Paper

One shot confocal microscopy based on wavelength/space conversion by use of multichannel spectrometer

Shuji Miyamoto, Eiji Hase, Ryuji Ichikawa, Takeo Mnamikawa, Takeshi Yasui, Hirotugu Yamamoto

Proceedings Volume 9720, 97201C (2016) https://doi.org/10.1117/12.2213814

KEYWORDS: Confocal microscopy, Spectroscopy, Biomedical optics, Image acquisition, Diffraction gratings, Relays, Inspection, Visualization, Microscopes, Light, Objectives, 3D image processing, Image sensors, 3D acquisition, Spectral resolution

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Proceedings Article | 7 March 2016 Paper

Paper

Scan-less, line-field confocal microscopy by combination of wavelength/space conversion with dual optical comb

Takeshi Yasui, Eiji Hase, Shuji Miyamoto, Yi-Da Hsieh, Takeo Minamikawa, Hirotsugu Yamamoto

Proceedings Volume 9720, 972006 (2016) https://doi.org/10.1117/12.2213560

KEYWORDS: Spectroscopy, Confocal microscopy, Frequency combs, Infrared spectroscopy, Frequency metrology, Objectives, Diffraction gratings, Terahertz radiation, Radio optics

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Proceedings Article | 22 May 2015 Paper

Paper

Recent developments in DFD (depth-fused 3D) display and arc 3D display

Shiro Suyama, Hirotsugu Yamamoto

Proceedings Volume 9495, 949507 (2015) https://doi.org/10.1117/12.2179853

KEYWORDS: 3D displays, 3D image processing, Liquid crystals, Scattering, Light scattering, Head, Prisms, Spatial frequencies, Eye, Refractive index

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Proceedings Article | 17 March 2015 Paper

Paper

Multi-layer 3D imaging using a few viewpoint images and depth map

Hidetsugu Suginohara, Hirotaka Sakamoto, Satoshi Yamanaka, Shiro Suyama, Hirotsugu Yamamoto

Proceedings Volume 9391, 939117 (2015) https://doi.org/10.1117/12.2076238

KEYWORDS: Bismuth, LCDs, 3D displays, Prototyping, Image processing, 3D image processing, Eye, Autostereoscopic displays, Polarization, Stereoscopy

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Proceedings Article | 6 March 2014 Paper

Paper

Stereoscopic model for depth-fused 3D (DFD) display

H. Yamamoto, H. Sonobe, A. Tsunakawa, J. Kawakami, S. Suyama

Proceedings Volume 9011, 90111L (2014) https://doi.org/10.1117/12.2040992

KEYWORDS: 3D modeling, Eye, 3D displays, Visual process modeling, Computer simulations, Eye models, Modulation, Electroluminescence, Gaussian filters, Visualization

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Proceedings Article | 12 March 2013 Paper

Paper

A new method to enlarge a range of continuously perceived depth in DFD (depth-fused 3D) display

Atsuhiro Tsunakawa, Tomoki Soumiya, Yuta Horikawa, Hirotsugu Yamamoto, Shiro Suyama

Proceedings Volume 8648, 86480L (2013) https://doi.org/10.1117/12.2005824

KEYWORDS: 3D displays, Spatial frequencies, 3D image processing, Modulation, 3D volumetric displays, LCDs, Stereoscopic displays, Mirrors, Glasses, Display technology

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Proceedings Article | 12 March 2013 Paper

Paper

Aerial 3D LED display by use of retroreflective sheeting

Hirotsugu Yamamoto, Shiro Suyama

Proceedings Volume 8648, 86480Q (2013) https://doi.org/10.1117/12.2005674

KEYWORDS: Light emitting diodes, Mirrors, Light sources, LED displays, 3D displays, Light, Free space, Reflectors, Retroreflectors, Lamps

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Proceedings Article | 1 March 2013 Paper

Paper

Aerial LED signage by use of crossed-mirror array

Hirotsugu Yamamoto, Ryousuke Kujime, Hiroki Bando, Shiro Suyama

Proceedings Volume 8643, 864302 (2013) https://doi.org/10.1117/12.2005733

KEYWORDS: Light emitting diodes, Mirrors, Optical components, Reflectivity, 3D displays, Lamps, LED displays, Reflectors, Point spread functions, Light sources

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Proceedings Article | 29 February 2012 Open Access

Open Access

Paper

Design of crossed-mirror array to form floating 3D LED signs

Hirotsugu Yamamoto, Hiroki Bando, Ryousuke Kujime, Shiro Suyama

Proceedings Volume 8288, 828820 (2012) https://doi.org/10.1117/12.909879

KEYWORDS: Light emitting diodes, Optical components, Mirrors, LED displays, Point spread functions, Light sources, Reflectors, Lamps, Image acquisition, Video

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Proceedings Article | 23 September 2011 Paper

Paper

A photonic DNA processor: concept and implementation

Takahiro Nishimura, Yusuke Ogura, Kenji Yamada, Hirotsugu Yamamoto, Jun Tanida

Proceedings Volume 8102, 810207 (2011) https://doi.org/10.1117/12.893269

KEYWORDS: Signal processing, Molecules, Molecular machines, Molecular photonics, Luminescence, Fluorescence resonance energy transfer, Visible radiation, Ultraviolet radiation, Target recognition, Prototyping

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Proceedings Article | 16 February 2011 Paper

Paper

A new volumetric 3D display using multi-varifocal lens and high-speed 2D display

Takanori Sonoda, Hirotsugu Yamamoto, Shiro Suyama

Proceedings Volume 7863, 786322 (2011) https://doi.org/10.1117/12.873305

KEYWORDS: 3D displays, 3D image processing, 3D volumetric displays, Light emitting diodes, Projection systems, LED displays, 3D image reconstruction, Polarization, Switching, Light sources

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Proceedings Article | 2 February 2011 Paper

Paper

Development of high-frame-rate LED panel and its applications for stereoscopic 3D display

H. Yamamoto, M. Tsutsumi, R. Yamamoto, K. Kajimoto, S. Suyama

Proceedings Volume 7956, 79560R (2011) https://doi.org/10.1117/12.874702

KEYWORDS: Light emitting diodes, LED displays, Cameras, Video, Video processing, Signal processing, 3D displays, Image processing, Eye, Stereoscopic displays

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Proceedings Article | 17 February 2010 Paper

Paper

Analysis of depth of field of stereoscopic cameras in lens-tilt configurations

Naoki Kaneko, Shiro Suyama, Hirotsugu Yamamoto

Proceedings Volume 7524, 75241I (2010) https://doi.org/10.1117/12.839581

KEYWORDS: Cameras, Stereoscopic cameras, LED displays, Imaging devices, Stereoscopic displays, Stereoscopy, 3D displays, Image fusion, Lenses, Optics

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Proceedings Article | 28 January 2010 Paper

Paper

Visual cryptography by use of polarization

Hirotsugu Yamamoto, Takanori Imagawa, Shiro Suyama

Proceedings Volume 7542, 754208 (2010) https://doi.org/10.1117/12.839399

KEYWORDS: Polarization, Visualization, Cryptography, Image encryption, Modulation, Image quality, Wave plates, Polarizers, Printing, Image processing

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Proceedings Article | 18 February 2009 Paper

Paper

Spatial-coding-based 2D/3D/P-P display

Hirotsugu Yamamoto, Shiro Suyama

Proceedings Volume 7237, 72371Y (2009) https://doi.org/10.1117/12.807084

KEYWORDS: LCDs, 3D displays, Polarization, Modulation, Image encryption, Visualization, Spatial light modulators, Information security, Cryptography, Image processing

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Proceedings Article | 13 February 2007 Paper

Paper

Development of 140-inch autostereoscopic display by use of full-color LED panel

H. Nishimura, T. Abe, H. Yamamoto, Y. Hayasaki, N. Nishida

Proceedings Volume 6486, 64861B (2007) https://doi.org/10.1117/12.703087

KEYWORDS: Light emitting diodes, Stereoscopic displays, LED displays, Reflection, Autostereoscopic displays, Photography, Eye, Light sources and illumination, Diamond, Absorption

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Proceedings Article | 8 February 2007 Paper

Paper

Secure display that limits the viewing space by use of optically decodable encryption

Hirotsugu Yamamoto, Yoshio Hayasaki

Proceedings Volume 6482, 64820C (2007) https://doi.org/10.1117/12.703098

KEYWORDS: Image encryption, LCDs, Visualization, 3D displays, Information security, Cryptography, 3D image processing, Eye, Optical logic, Liquid crystals

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Proceedings Article | 2 February 2006 Paper

Paper

Near-infrared spectroscopy probe with position sensor for obtaining spatial metabolism on human tissue

Shuji Taue, Yoko Fujimoto, Mayumi Fukuda, Hisashi Oka, Hirotsugu Yamamoto, Yoshio Hayasaki, Nobuo Nishida

Proceedings Volume 6026, 602606 (2006) https://doi.org/10.1117/12.667098

KEYWORDS: Near infrared spectroscopy, Light emitting diodes, Position sensors, CMOS cameras, Cameras, Mode conditioning cables, Tissue optics, Photodetectors, CMOS sensors, Image processing

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Proceedings Article | 30 December 2005 Paper

Paper

Reduction of debris and thermal destruction by use of transparent material coating method in femtosecond laser processing

Daiki Kawamura, Akihiro Takita, Hirotsugu Yamamoto, Yoshio Hayasaki, Nobuo Nishida

Proceedings Volume 6028, 60281V (2005) https://doi.org/10.1117/12.667327

KEYWORDS: Pulsed laser operation, Glasses, Polymethylmethacrylate, Image processing, Femtosecond phenomena, Coating, Atomic force microscopy, Laser damage threshold, Particles, Laser energy

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Proceedings Article | 25 October 2004 Paper

Paper

Large LED screen 3D television system without eyewear

Nobuo Nishida, Hirotsugu Yamamoto, Yoshio Hayasaki

Proceedings Volume 5599, (2004) https://doi.org/10.1117/12.579431

KEYWORDS: Light emitting diodes, LED displays, Cameras, Eyewear, Stereoscopic displays, Eye, Lamps, Image processing, 3D displays, Televisions

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Proceedings Article | 25 October 2004 Paper

Paper

Secure information display by use of multiple decoding masks

Hirotsugu Yamamoto, Yoshio Hayasaki, Nobuo Nishida

Proceedings Volume 5600, (2004) https://doi.org/10.1117/12.572866

KEYWORDS: Image encryption, Image compression, Visualization, Information security, Cryptography, Computer security, LCDs, Network security, Information visualization, Binary data

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Proceedings Article | 8 October 2004 Paper

Paper

Structures on human fingernail surface processed by use of a focused femtosecond laser pulse

Hayato Takagi, Akihiro Takita, Hirotsugu Yamamoto, Yoshio Hayasaki, Nobuo Nishida, Hiroaki Misawa

Proceedings Volume 5662, (2004) https://doi.org/10.1117/12.596598

KEYWORDS: Glasses, Femtosecond phenomena, Pulsed laser operation, Microscopes, Diffraction, Atomic force microscopy, Optical microscopes, Reflection, Objectives, Laser energy

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Proceedings Article | 8 October 2004 Paper

Paper

Fluorescence from structure in human fingernail formed by use of a focused near-infrared femtosecond laser pulse

Akihiro Takita, Hirotsugu Yamamoto, Yoshio Hayasaki, Nobuo Nishida, Hiroaki Misawa

Proceedings Volume 5662, (2004) https://doi.org/10.1117/12.596614

KEYWORDS: Luminescence, Femtosecond phenomena, Microscopes, Spectroscopy, Optical filters, Laser processing, 3D optical data storage, Pulsed laser operation, Optical storage, Semiconductor lasers

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Proceedings Article | 22 June 2004 Paper

Paper

Securing display of grayscale and multicolored images by use of visual cryptography

Hirotsugu Yamamoto, Yoshio Hayasaki, Nobuo Nishida

Proceedings Volume 5306, (2004) https://doi.org/10.1117/12.528495

KEYWORDS: Visualization, Cryptography, Image encryption, LCDs, Information security, Phase modulation, Information visualization, Computer security, Network security, Opacity

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Proceedings Article | 19 November 2003 Paper

Paper

Functional near-infrared imaging system using adaptable multi-channel probes

Shuji Taue, Hirotsugu Yamamoto, Yoshio Hayasaki, Nobuo Nishida, Hajime Miura

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.523834

KEYWORDS: Imaging systems, Light emitting diodes, Oxygen, Sensors, Absorbance, Scattering, Liquids, Signal detection, Optical amplifiers, Optics

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Proceedings Article | 19 November 2003 Paper

Paper

Three-dimensional optical data storage in a nail for new data transportation

Akihiro Takita, Hirotsugu Yamamoto, Yoshio Hayasaki, Nobuo Nishida, Mitsuru Watanabe, Shigeki Matsuo, Hiroaki Misawa

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.531112

KEYWORDS: 3D optical data storage, Microscopes, Optical storage, Data storage, Femtosecond phenomena, Pulsed laser operation, Laser systems engineering, Optical recording, Confocal microscopy, Surface roughness

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Proceedings Article | 23 May 2002 Paper

Paper

Reduction of the thickness of lenticular stereoscopic display using full-color LED panel

Hirotsugu Yamamoto, Syuji Muguruma, Yoshio Hayasaki, Yoshifumi Nagai, Yoshinori Shimizu, Nobuo Nishida

Proceedings Volume 4660, (2002) https://doi.org/10.1117/12.468037

KEYWORDS: Stereoscopic displays, LED displays, Optical parametric oscillators, Light emitting diodes, Virtual reality, Sodium, Calcium, Barium, Glasses, Diffusion

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Proceedings Article | 8 May 2001 Paper

Paper

Photorefractive effect in azo-dye-doped polymers with electric field and photo-induced polings

Masateru Matsubara, Yoshio Hayasaki, Hirotsugu Yamamoto, Nobuo Nishida

Proceedings Volume 4416, (2001) https://doi.org/10.1117/12.427096

KEYWORDS: Photorefractive polymers, Diffraction, Photorefraction, Polymers, Four wave mixing, Polarization, Refractive index, Polarizers, Diffraction gratings, Electro optics

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Proceedings Article | 8 May 2001 Paper

Paper

Angle measurement by use of a liquid-crystal spatial light modulator with optical feedback

Yoshio Hayasaki, Shusaku Hara, Yoshihito Yuasa, Hirotsugu Yamamoto, Nobuo Nishida

Proceedings Volume 4416, (2001) https://doi.org/10.1117/12.427091

KEYWORDS: Complex systems, Glasses, Liquid crystals, Imaging systems, Spatial light modulators, Modulation, Phase shifts, Wavefronts, Spatial frequencies, Adaptive optics

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Proceedings Article | 8 May 2001 Paper

Paper

Measurement of spatial coherence of a superluminescent diode using an interferometer with double slit

Noritaka Negi, Hirotsugu Yamamoto, Yoshio Hayasaki, Nobuo Nishida

Proceedings Volume 4416, (2001) https://doi.org/10.1117/12.427090

KEYWORDS: Visibility, Light emitting diodes, Spatial coherence, Light sources, Microscopes, Superluminescent diodes, Interferometers, Diffraction, Coherence (optics), Lithium

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Proceedings Article | 22 November 2000 Paper

Paper

Spatiotemporal property and functions of nonlinear optoelectronic feedback system

Yoshio Hayasaki, Yuuki Tamura, Hirotsugu Yamamoto, Nobuo Nishida

Proceedings Volume 4124, (2000) https://doi.org/10.1117/12.407496

KEYWORDS: LCDs, Optoelectronics, CCD cameras, Frame grabbers, Spatial frequencies, Diffraction, Complex systems, Device simulation, Spatial filters, Modulation

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Proceedings Article | 2 November 2000 Paper

Paper

Optical signal processing using spatiotemporal dynamic system with spatial light modulator

Yoshio Hayasaki, Hirotsugu Yamamoto, Nobuo Nishida

Proceedings Volume 4113, (2000) https://doi.org/10.1117/12.405839

KEYWORDS: Spatial frequencies, Spatial filters, Optical filters, Control systems, Diffraction, CCD cameras, LCDs, Filtering (signal processing), Fringe analysis, Spatial light modulators

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Proceedings Article | 24 May 2000 Paper

Paper

Nonlinear optoelectronic feedback system

Yoshio Hayasaki, Yuuki Tamura, Shusaku Hara, Hirotsugu Yamamoto, Nobuo Nishida

Proceedings Volume 4089, (2000) https://doi.org/10.1117/12.386834

KEYWORDS: LCDs, Optoelectronics, CCD cameras, Frame grabbers, Optically addressed spatial light modulators, Integrated optics, Spatial light modulators, Computing systems, Nonlinear optics, Complex systems

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Proceedings Article | 20 October 1998 Paper

Paper

Analysis and control of spatial frequency in spontaneously generated optical patterns

Yoshio Hayasaki, Hirotsugu Yamamoto, Nobuo Nishida

Proceedings Volume 3432, (1998) https://doi.org/10.1117/12.327973

KEYWORDS: Spatial frequencies, Liquid crystals, Resonators, Nonlinear filtering, Spatial filters, Mirrors, Molecules, Diffraction, Nonlinear optics, Refractive index

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