Prof. Kohei Arai Profile

Prof. Kohei Arai

Professor at Saga Univ

SPIE Involvement:

Author | Editor

Publications (23)

Proceedings Article | 20 November 2024 Presentation + Paper

Disaster area detection based on YOLOv8 using SAR data

Yushin Nakaoka, Kohei Arai, Hiroshi Okumura, Osamu Fukuda, Nobuhiko Yamaguchi, Wen Liang Yeoh

Proceedings Volume 13196, 131960H (2024) https://doi.org/10.1117/12.3031749

KEYWORDS: Synthetic aperture radar, Landslides, Education and training, Data modeling, Image segmentation, Earthquakes, Machine learning, Object detection, Microwave radiation, Shadows

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Proceedings Article | 19 October 2023 Poster + Paper

Application of generative adversarial network: GAN to disaster damage monitoring

Yushin Nakaoka, Kohei Arai, Osamu Fukuda, Nobuhiko Yamaguchi, Wen Liang Yeoh, Hiroshi Okumura

Proceedings Volume 12733, 127330Z (2023) https://doi.org/10.1117/12.2679974

KEYWORDS: Synthetic aperture radar, Machine learning, Image fusion, Microwave radiation, Gallium nitride, Education and training, Landslides, Reflection, Natural disasters, Bridges

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Proceedings Article | 20 October 2014 Paper

Development of PM2.5 density distribution visualization system using ground-level sensor network and Mie lidar

Hiroshi Okumura, Taiga Akaho, Yu Kojiro, Osamu Uchino, Isamu Morino, Tatsuya Yokota, Tomohiro Nagai, Tetsu Sakai, Takashi Maki, Akihiro Yamazaki, Kohei Arai

Proceedings Volume 9246, 92460V (2014) https://doi.org/10.1117/12.2067589

KEYWORDS: Atmospheric particles, LIDAR, Visualization, Earth's atmosphere, Sensor networks, Aerosols, Visual analytics, Motion analysis, Environmental sensing, Atmospheric sciences

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Proceedings Article | 25 September 2014 Paper

Vicarious calibration of Terra/ASTER/VNIR with desert scenes together with cross calibration

K. Arai

Proceedings Volume 9218, 92180R (2014) https://doi.org/10.1117/12.2060226

KEYWORDS: Calibration, Error analysis, Reflectivity, MODIS, Atmospheric optics, Optical calibration, Satellites, Near infrared, Lamps, Sensors

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Proceedings Article | 14 March 2013 Paper

Development of a human vision simulation camera and its application: implementation of specific color perception

Hiroshi Okumura, Shoichiro Takubo, Shoichi Ozaki, Takeru Kawasaki, Indra Abdullah, Kohei Arai, Osamu Fukuda

Proceedings Volume 8651, 86511E (2013) https://doi.org/10.1117/12.2002936

KEYWORDS: Color vision, Cones, Cameras, Device simulation, Human vision and color perception, Rods, Retina, Medicine, Nerve agents, Color blindness

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Proceedings Article | 4 February 2013 Paper

Improvement of web-based data acquisition and management system for GOSAT validation lidar data analysis

Hiroshi Okumura, Shoichiro Takubo, Takeru Kawasaki, Indra Nugraha Abdullah, Osamu Uchino, Isamu Morino, Tatsuya Yokota, Tomohiro Nagai, Tetsu Sakai, Takashi Maki, Kohei Arai

Proceedings Volume 8654, 86540X (2013) https://doi.org/10.1117/12.2003921

KEYWORDS: Data acquisition, LIDAR, Meteorology, Data modeling, Ozone, Atmospheric modeling, Data analysis, Cameras, Satellites, Magnetic resonance imaging

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Proceedings Article | 19 November 2012 Paper

Observation of aerosol parameters at Saga using GOSAT product validation lidar

Shoichiro Takubo, Hiroshi Okumura, Takeru Kawasaki, Indra Nugraha Abdullah, Osamu Uchino, Isamu Morino, Tatsuya Yokota, Tomohiro Nagai, Tetsu Sakai, Takashi Maki, Kohei Arai

Proceedings Volume 8526, 852613 (2012) https://doi.org/10.1117/12.977607

KEYWORDS: LIDAR, Aerosols, Backscatter, Data acquisition, Data modeling, Raman spectroscopy, Fourier transforms, Polarization, Molecules, Atmospheric particles

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Proceedings Article | 8 November 2012 Paper

Web-based data acquisition and management system for GOSAT validation Lidar data analysis

Hiroshi Okumura, Shoichiro Takubo, Takeru Kawasaki, Indra Abdullah, Osamu Uchino, Isamu Morino, Tatsuya Yokota, Tomohiro Nagai, Tetsu Sakai, Takashi Maki, Kohei Arai

Proceedings Volume 8537, 853714 (2012) https://doi.org/10.1117/12.974892

KEYWORDS: Data acquisition, LIDAR, Meteorology, Cameras, Data analysis, Satellites, Ozone, Signal processing, Infrared imaging, Gases

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Proceedings Article | 2 February 2012 Paper

Development of a human vision simulation camera and its application

Hiroshi Okumura, Mai Fukusaki, Shoichiro Takubo, Kohei Arai

Proceedings Volume 8295, 82951M (2012) https://doi.org/10.1117/12.912151

KEYWORDS: Device simulation, Cameras, Cones, Rods, Luminous efficiency, Human vision and color perception, Medicine, Nerve agents, Retina, Imaging systems

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Proceedings Article | 13 November 2010 Paper

Red tide detection by means of peak shift of remote sensing reflectance and possibility of red tide detection with polarized radiance measurements

Kohei Arai, Yasunori Terayama

Proceedings Volume 7856, 78560B (2010) https://doi.org/10.1117/12.869366

KEYWORDS: Polarization, Cameras, Reflectivity, Solids, MODIS, Bandpass filters, Remote sensing, Data acquisition, Imaging systems, Satellite imaging

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Proceedings Article | 28 September 2009 Paper

Change detection method for remotely sensed images based on multivariate analysis method and statistical test

Hiroshi Okumura, Ryohei Yamasaki, Tatsunori Goto, Kohei Arai

Proceedings Volume 7477, 747717 (2009) https://doi.org/10.1117/12.830329

KEYWORDS: Statistical analysis, Sensors, Remote sensing, Current controlled current source, Image segmentation, Buildings, Landsat, Information science, Canonical correlation analysis, Earth observing sensors

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Proceedings Article | 12 August 2009 Paper

Aerosol parameter estimation through atmospheric polarization observation with the different observation angles

K. Arai, Yui Nishimura

Proceedings Volume 7461, 746106 (2009) https://doi.org/10.1117/12.824669

KEYWORDS: Refractive index, Aerosols, Scattering, Reflectivity, Polarization, Atmospheric particles, Atmospheric optics, Sun, Error analysis, Optical testing

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Proceedings Article | 12 August 2009 Paper

Reflectance based vicarious calibration of ASTER/VNIR with aerosol refractive index and size distribution estimation using measured atmospheric polarization irradiance

K. Arai

Proceedings Volume 7461, 746108 (2009) https://doi.org/10.1117/12.835926

KEYWORDS: Refractive index, Aerosols, Calibration, Atmospheric particles, Reflectivity, Polarization, Scattering, Ozone, Water, Optical testing

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Proceedings Article | 10 October 2008 Paper

Two-dimensional thermography image retrieval from zig-zag scanned data with TZ-SCAN

Hiroshi Okumura, Ryohei Yamasaki, Kohei Arai

Proceedings Volume 7109, 710914 (2008) https://doi.org/10.1117/12.799928

KEYWORDS: Thermography, Data acquisition, Cameras, Image retrieval, Temperature metrology, Data conversion, Imaging devices, Data storage, Human-machine interfaces, Control systems

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Proceedings Article | 24 October 2007 Paper

A hybrid classification method using spectral, spatial, and textural features for remotely sensed images based on morphological filtering

Hiroshi Okumura, Makoto Yamaura, Kohei Arai

Proceedings Volume 6748, 67481C (2007) https://doi.org/10.1117/12.737635

KEYWORDS: Image classification, Image filtering, Edge detection, Optical filters, Sensors, Principal component analysis, Image sensors, Genetic algorithms, Image processing, Information science

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Proceedings Article | 10 November 2004 Paper

Improvement of unsupervised texture classification based on genetic algorithms

Hiroshi Okumura, Yuuki Togami, Kohei Arai

Proceedings Volume 5573, (2004) https://doi.org/10.1117/12.565776

KEYWORDS: Image classification, Genetic algorithms, Tantalum, Reliability, Skin, Information science, Scanners, Zernike polynomials, Binary data, Fourier transforms

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Proceedings Article | 5 February 2004 Paper

Unsupervised texture classification method using appropriate training area selection based on genetic algorithms

Hiroshi Okumura, Masaru Maeda, Hideki Sueyasu, Yuuki Togami, Takeshi Tadanou, Kohei Arai

Proceedings Volume 5238, (2004) https://doi.org/10.1117/12.510908

KEYWORDS: Image classification, Tantalum, Genetic algorithms, Reliability, Scanners, Information science, Surgery, Image processing, Zernike polynomials, Binary data

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Proceedings Article | 13 March 2003 Paper

Appropriate training area selection for supervised texture classification by using the genetic algorithms

Hiroshi Okumura, Masaru Maeda, Kohei Arai

Proceedings Volume 4885, (2003) https://doi.org/10.1117/12.463148

KEYWORDS: Image classification, Tantalum, Genetic algorithms, Reliability, Multispectral imaging, Scanners, Information science, Zernike polynomials, Binary data, Fourier transforms

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Proceedings Article | 13 March 2003 Paper

Automated corresponding point candidate selection for image registration using wavelet transformation, neural network with rotation invariant inputs, and context information about neighboring candidates

Hiroshi Okumura, Masashi Suezaki, Hideki Sueyasu, Kohei Arai

Proceedings Volume 4885, (2003) https://doi.org/10.1117/12.463147

KEYWORDS: Image registration, Artificial neural networks, Neural networks, Wavelets, Wavelet transforms, Distortion, Tolerancing, Zernike polynomials, Information science, Image sensors

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Proceedings Article | 31 December 1997 Paper

Sensitivity analysis of an atmospheric code for vicarious calibration of ADEOS AVNIR

Kohei Arai

Proceedings Volume 3221, (1997) https://doi.org/10.1117/12.298088

KEYWORDS: Atmospheric sensing, Atmospheric particles, Calibration, Refractive index, Aerosols, Radiative transfer

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Proceedings Article | 27 January 1997 Paper

Calibration plan and preliminary field campaign for ASTER

Kohei Arai, Satoshi Tsuchida, Kurtis Thome

Proceedings Volume 2957, (1997) https://doi.org/10.1117/12.265440

KEYWORDS: Calibration, Radiometry, Sensors, Lamps, Data acquisition, Reflectivity, Short wave infrared radiation, Halogens, Black bodies, MODIS

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Proceedings Article | 9 January 1995 Paper

Radiometric calibration techniques for ASTER

Fumihiro Sakuma, Akira Ono, Kohei Arai

Proceedings Volume 2317, (1995) https://doi.org/10.1117/12.198955

KEYWORDS: Calibration, Black bodies, Radiometry, Short wave infrared radiation, Lamps, Temperature metrology, Mirrors, Photodiodes, Thermography, Halogens

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Proceedings Article | 9 January 1995 Paper

Basic concept and development of ASTER data processing system

Isao Sato, Kiyonari Fukue, Kohei Arai

Proceedings Volume 2317, (1995) https://doi.org/10.1117/12.198954

KEYWORDS: Data processing, Data acquisition, Data archive systems, Telecommunications, Double positive medium, Spatial resolution, Short wave infrared radiation, Radiometry, Space operations, Algorithm development

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Showing 5 of 23 publications

Proceedings Volume Editor (1)

SPIE Conference Volume | 24 December 2019

Sixth International Symposium on LAPAN-IPB Satellite

Conference Committee Involvement (1)

Sixth International Symposium on LAPAN-IPB Satellite

17 September 2019 | Bogor, Indonesia

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