Dr. Keigo Hirakawa Profile

Dr. Keigo Hirakawa

Professor at Univ of Dayton

SPIE Involvement:

Author

Proceedings Article | 3 October 2023 Presentation + Paper

Single-shot spectroscopy using continuously variable filters

Roseanna Lawandi, Zhanibek Bolatbek, Imad Agha, Keigo Hirakawa, Andrew Sarangan

Proceedings Volume 12653, 1265307 (2023) https://doi.org/10.1117/12.2681657

KEYWORDS: Tunable filters, Signal filtering, Optical filters, Film thickness, Detector arrays, Spectroscopy, Fabrication, Dielectric filters, Linear filtering, Fabry–Perot interferometers

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Proceedings Article | 15 June 2023 Poster

A Tunable transmission filter using Phase Change Materials (PCM) for smart IR night vision applications

Remona Heenkenda, Keigo Hirakawa, Andrew Sarangan

Proceedings Volume 12514, 125140I (2023) https://doi.org/10.1117/12.2670243

KEYWORDS: Tunable filters, Optical filters, Night vision, Industrial applications, Near infrared, Infrared imaging, Visible radiation, Silicon, Design and modelling, Titanium dioxide

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Proceedings Article | 22 May 2023 Presentation + Paper

Computationally efficient and high fidelity log-based demosaicking for degree of linear polarization

Joseph Raffoul, Daniel LeMaster, Keigo Hirakawa

Proceedings Volume 12327, 123270Y (2023) https://doi.org/10.1117/12.2641706

KEYWORDS: Polarization, Reconstruction algorithms, Signal to noise ratio, Linear filtering, Sensors, Polarizers, Polarimetry, Image interpolation

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SPIE Journal Paper | 4 March 2021

Color-compressive bilateral filter and nonlocal means for high-dimensional images

Christina Karam, Kenjiro Sugimoto, Keigo Hirakawa

JEI, Vol. 30, Issue 02, 023001, (March 2021) https://doi.org/10.1117/12.10.1117/1.JEI.30.2.023001

KEYWORDS: Optical filters, Image filtering, Convolution, Image processing, Hyperspectral imaging, Denoising, Stochastic processes, Linear filtering, Gaussian filters, Digital filtering

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Proceedings Article | 21 August 2020 Presentation

Spectroscopy using tunable liquid crystal Fourier filters

Roseanna Lawandi, Keigo Hirakawa, Andrew Sarangan

Proceedings Volume 11467, 114670O (2020) https://doi.org/10.1117/12.2567658

KEYWORDS: Liquid crystals, Optical filters, Spectroscopy, Tunable filters, Dielectric filters, Photodetectors, Dielectrics, Electronic filtering, Fabrication, Thin films

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SPIE Journal Paper | 24 July 2020

Improved photometric acceptance testing in image feature extraction tasks

ElHusain Saad, Keigo Hirakawa

JEI, Vol. 29, Issue 04, 043012, (July 2020) https://doi.org/10.1117/12.10.1117/1.JEI.29.4.043012

KEYWORDS: Sensors, Feature extraction, Testing and analysis, Stars, Statistical modeling, Solids, Mirrors, Light sources and illumination, Target detection

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Proceedings Article | 3 September 2019 Presentation + Paper

Fabrication of integrated single-chip Fourier spectrometers

Roseanna Lawandi, Keigo Hirakawa, Partha Banerjee, Andrew Sarangan

Proceedings Volume 11089, 110890V (2019) https://doi.org/10.1117/12.2529798

KEYWORDS: Photodetectors, Sensors, Silicon, Optical filters, Spectrometers, Optical lithography, Dielectrics

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Proceedings Article | 26 September 2016 Presentation + Paper

Design and fabrication of Fourier spectral filter array for multispectral imaging

Chuan Ni, Jie Jia, Keigo Hirakawa, Andrew Sarangan

Proceedings Volume 9927, 99270W (2016) https://doi.org/10.1117/12.2238864

KEYWORDS: Multispectral imaging, Optical filters, Image filtering, Imaging arrays, RGB color model, Transmittance, Photomasks, Zinc, Photoresist materials, Image sensors

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Proceedings Article | 20 August 2015 Presentation + Paper

Design and fabrication of sinusoidal spectral filters for multispectral imaging

Chuan Ni, Jie Jia, Keigo Hirakawa, Andrew Sarangan

Proceedings Volume 9556, 95560I (2015) https://doi.org/10.1117/12.2188830

KEYWORDS: Optical filters, Multispectral imaging, Zinc, Fabry–Perot interferometers, Refractive index, Manufacturing, Image filtering, Reflectivity, Sputter deposition, Design for manufacturability

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Proceedings Article | 21 May 2014 Paper

Fourier domain design of microgrid imaging polarimeters with improved spatial resolution

Keigo Hirakawa, Daniel LeMaster

Proceedings Volume 9099, 909906 (2014) https://doi.org/10.1117/12.2053475

KEYWORDS: Spatial resolution, Polarimetry, Modulation, Polarization, Imaging systems, Fourier transforms, Analytical research, Spatial frequencies, Image resolution, Remote sensing

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Proceedings Article | 19 February 2013 Paper

Approximations to camera sensor noise

Xiaodan Jin, Keigo Hirakawa

Proceedings Volume 8655, 86550H (2013) https://doi.org/10.1117/12.2019212

KEYWORDS: Sensors, Interference (communication), Data modeling, Wavelets, Image sensors, Cameras, Stochastic processes, Quantization, Image denoising, Signal to noise ratio

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Proceedings Article | 3 February 2009 Paper

Wavelet-based Poisson rate estimation using the Skellam distribution

Keigo Hirakawa, Farhan Baqai, Patrick Wolfe

Proceedings Volume 7246, 72460R (2009) https://doi.org/10.1117/12.815487

KEYWORDS: Statistical analysis, Signal processing, Wavelets, Radon, Stochastic processes, Electronics, Data communications, Astronomy, Magnetic resonance imaging, Filtering (signal processing)

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Proceedings Article | 28 January 2008 Paper

Second-generation color filter array and demosaicking designs

Keigo Hirakawa, Patrick Wolfe

Proceedings Volume 6822, 68221P (2008) https://doi.org/10.1117/12.767058

KEYWORDS: Sensors, Optical filters, Cameras, Spatial resolution, Modulation, Digital cameras, Image sensors, Image processing, Demodulation, Image quality

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Proceedings Article | 20 September 2007 Paper

Signal-dependent noise characterization in Haar filterbank representation

Keigo Hirakawa

Proceedings Volume 6701, 67011I (2007) https://doi.org/10.1117/12.735290

KEYWORDS: Interference (communication), Signal processing, Electronic filtering, Filtering (signal processing), Statistical analysis, Data modeling, Statistical modeling, Error analysis, Wavelets, Time-frequency analysis

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Showing 5 of 14 publications

Conference Committee Involvement (5)

Visual Information Processing and Communication VI

10 February 2015 | San Francisco, California, United States

Visual Information Processing and Communication V

5 February 2014 | San Francisco, California, United States

Visual Information Processing and Communication IV

6 February 2013 | Burlingame, California, United States

Visual Information Processing and Communication III

24 January 2012 | Burlingame, California, United States

Visual Information Processing and Communication II

25 January 2011 | San Francisco Airport, California, United States

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