Keita Hirai

According to our database, Keita Hirai authored at least 61 papers between 2006 and 2023.

Collaborative distances:

• Dijkstra number of four.
• Erdős number of five.

2023

Mental-state estimation model with time-series environmental data regarding cognitive function.

Isao Kurebayashi, Koshiro Maeda, Nobuyoshi Komuro, Keita Hirai, Hiroo Sekiya, Makoto Ichikawa

Internet Things, July, 2023

2022

Evaluating the Influence of ipRGCs on Color Discrimination.

Masaya Ohtsu, Akihiro Kurata, Keita Hirai, Midori Tanaka, Takahiko Horiuchi

J. Imaging, 2022

Fabrication of a Human Skin Mockup with a Multilayered Concentration Map of Pigment Components Using a UV Printer.

Kazuki Nagasawa, Shoji Yamamoto, Wataru Arai, Kunio Hakkaku, Chawan Koopipat, Keita Hirai, Norimichi Tsumura

J. Imaging, 2022

Hand authentication from RGB-D video based on deep neural network.

Ryogo Miyazaki, Kazuya Sasaki, Norimichi Tsumura, Keita Hirai

Proceedings of the 3D Imaging and Applications 2022, online, January 15-26, 2022, 2022

2021

Video Smoke Removal from a Single Image Sequence.

Shiori Yamaguchi, Keita Hirai, Takahiko Horiuchi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2021

A Study on Time Series Analysis of Environmental Data for Predicting Emotional Conditions.

Koshiro Maeda, Isao Kurebayashi, Nobuyoshi Komuro, Keita Hirai

Proceedings of the 3rd IEEE Global Conference on Life Sciences and Technologies, 2021

Testing Machine Learning Models for Individual Emotion Estimation from Indoor Environment Data.

Isao Kurebayashi, Nobuyoshi Komuro, Keita Hirai

Proceedings of the IEEE International Conference on Consumer Electronics-Taiwan, 2021

Color Discrimination Experiments using Metameric ipRGC Stimuli.

Masaya Ohtsu, Akihiro Kurata, Keita Hirai

Proceedings of the Color Imaging XXVI: Displaying, 2021

2020

Spectral Estimation of Multiple Light Sources based on Highlight Detection.

Shoji Tominaga, Keita Hirai, Takahiko Horiuchi

Proceedings of the 28th Color and Imaging Conference, 2020

Investigating Effects of Visual and Auditory Adaptation on Metallic Material Appearance.

Takumi Nakamura, Yagi Daichi, Kuangzhe Xu, Toshihiko Matsuka, Keita Hirai

Proceedings of the 28th Color and Imaging Conference, 2020

Image-Based Measurement of Structural Color using Spectral Camera.

Kazuki Iwata, Hiroki Shirasawa, Keita Hirai

Proceedings of the 28th Color and Imaging Conference, 2020

Estimation of Layered Ink Layout to reproduce desired Translucency of skin in Inkjet 3D Printer using deep neural network trained with synthetic simulated data.

Kensuke Fukumoto, Kazuki Nagasawa, Wataru Arai, Kunio Hakkaku, Satoshi Kaneko, Keita Hirai, Norimichi Tsumura

Proceedings of the 28th Color and Imaging Conference, 2020

BTF Image Recovery based on U-Net and Texture Interpolation.

Naoki Tada, Keita Hirai

Proceedings of the Material Appearance 2020, Burlingame, CA, USA, January 26-30, 2020, 2020

2019

Advances in Cross-Spectral Iris Recognition Using Integrated Gradientface-Based Normalization.

Maulisa Oktiana, Khairun Saddami, Fitri Arnia, Yuwaldi Away, Keita Hirai, Takahiko Horiuchi, Khairul Munadi

IEEE Access, 2019

Construction of facial emotion database through subjective experiments and its application to deep learning-based facial image processing.

Tomoyuki Takanashi, Keita Hirai, Takahiko Horiuchi

Proceedings of the Image Processing: Algorithms and Systems XVII, 2019

Estimation of Layered Ink Layout from Arbitrary Skin Color and Translucency in Inkjet 3D Printer.

Junki Yoshii, Shoji Yamamoto, Kazuki Nagasawa, Wataru Arai, Satoshi Kaneko, Keita Hirai, Norimichi Tsumura

Proceedings of the 27th Color and Imaging Conference, 2019

Appearance Reconstruction of Fluorescent Objects Based on Reference Geometric Factors.

Shoji Tominaga, Keita Hirai, Takahiko Horiuchi

Proceedings of the 27th Color and Imaging Conference, 2019

Appearance Reconstruction of Mutual Illumination Effect between Plane and Curved Fluorescent Objects.

Shoji Tominaga, Keita Hirai, Takahiko Horiuchi

Proceedings of the Material Appearance 2019, Burlingame, CA, USA, January 13-17, 2019, 2019

Constructing glossiness perception model of computer graphics with sounds.

Takumi Nakamura, Keita Hirai, Takahiko Horiuchi

Proceedings of the Material Appearance 2019, Burlingame, CA, USA, January 13-17, 2019, 2019

Makeup Skin Appearance Reproduction by Spectral Projection Mapping.

Hiroki Shirasawa, Keita Hirai, Takahiko Horiuchi

Proceedings of the Computational Color Imaging - 7th International Workshop, 2019

Haze Transfer Between Images Based on Dark Channel Prior.

Koushirou Maeda, Keita Hirai, Takahiko Horiuchi

Proceedings of the Computational Color Imaging - 7th International Workshop, 2019

2018

High-Dynamic-Range Spectral Imaging System for Omnidirectional Scene Capture.

Keita Hirai, Naoto Osawa, Motoki Hori, Takahiko Horiuchi, Shoji Tominaga

J. Imaging, 2018

Reversible Color-to-Gray Mapping with Resistance to JPEG Encoding.

Takahiko Horiuchi, Xu Wen, Keita Hirai

Proceedings of the 2018 IEEE Southwest Symposium on Image Analysis and Interpretation, 2018

A General Method for Estimating Fluorescent Donaldson Matrices.

Shoji Tominaga, Keita Hirai, Takahiko Horiuchi

Proceedings of the Material Appearance 2018, Burlingame, CA, USA, January 28, 2018

2017

Fabric Appearance Control System for Example-Based Interactive Texture and Color Design.

Takafumi Katsunuma, Keita Hirai, Takahiko Horiuchi

ACM Trans. Appl. Percept., 2017

Correlation Analysis between Wood Eigen Textures and Perceptual Qualities.

Yoshimitsu Yamada, Keita Hirai, Takahiko Horiuchi

Proceedings of the 25th Color and Imaging Conference, 2017

Appearance Reconstruction of Fluorescent Objects for Different Materials and Light Source.

Shoji Tominaga, Keiji Kato, Keita Hirai, Takahiko Horiuchi

Proceedings of the 25th Color and Imaging Conference, 2017

Analysis of Material Representation of Manga Line Drawings using Convolutional Neural Networks.

Takahiko Horiuchi, Yuma Saito, Keita Hirai

Proceedings of the 25th Color and Imaging Conference, 2017

Appearance Decomposition and Reconstruction of Textured Fluorescent Objects.

Shoji Tominaga, Keiji Kato, Keita Hirai, Takahiko Horiuchi

Proceedings of the Material Appearance 2017, Burlingame, CA, USA, January 29, 2017

Interactive Object Surface Retexturing using Perceptual Quality Indexes.

Keita Hirai, Wataru Suzuki, Yoshimitsu Yamada, Takahiko Horiuchi

Proceedings of the Material Appearance 2017, Burlingame, CA, USA, January 29, 2017

Video Smoke Removal Based on Smoke Imaging Model and Space-Time Pixel Compensation.

Shiori Yamaguchi, Keita Hirai, Takahiko Horiuchi

Proceedings of the Computational Color Imaging - 6th International Workshop, 2017

2016

Spectral Image Analysis of Florescent Objects with Mutual Illumination.

Shoji Tominaga, Keiji Kato, Keita Hirai, Takahiko Horiuchi

Proceedings of the 24th Color and Imaging Conference, 2016

Measuring Spectral Reflectance and 3D Shape Using Multi-primary Image Projector.

Keita Hirai, Ryosuke Nakahata, Takahiko Horiuchi

Proceedings of the Image and Signal Processing - 7th International Conference, 2016

Modeling and Estimation for Surface-Spectral Reflectance of Watercolor Paintings.

Shoji Tominaga, Shingo Dozaki, Yukiko Kuma, Keita Hirai, Takahiko Horiuchi

Proceedings of the Measuring, 2016

Perceptual Dependencies in Fabric Appearance between Texture and Color.

Takafumi Katsunuma, Keita Hirai, Takahiko Horiuchi

Proceedings of the Measuring, 2016

2015

Bispectral Interreflection Estimation of Fluorescent Objects.

Shoji Tominaga, Keiji Kato, Keita Hirai, Takahiko Horiuchi

Proceedings of the 23rd Color and Imaging Conference, 2015

Construction of Manga Materials Database for Analyzing Perception of Materials in Line Drawings.

Yuma Saito, Keita Hirai, Takahiko Horiuchi

Proceedings of the 23rd Color and Imaging Conference, 2015

Photometric and geometric measurements based on multi-primary image projector.

Keita Hirai, Daisuke Irie, Takahiko Horiuchi

Proceedings of the Colour and Visual Computing Symposium, 2015

Development of a Dynamic Relighting System for Moving Planar Objects with Unknown Reflectance.

Ryosuke Nakahata, Keita Hirai, Takahiko Horiuchi, Shoji Tominaga

Proceedings of the Computational Color Imaging - 5th International Workshop, 2015

Visual Quality Improvement of Color-Embedded Gray Images for a Reversible Color-to-Gray Algorithm.

Takahiko Horiuchi, Jiqiang Lin, Keita Hirai

Proceedings of the Second International Afro-European Conference for Industrial Advancement, 2015

2014

Color image recovery system from printed gray image.

Jiqiang Lin, Takahiko Horiuchi, Keita Hirai, Shoji Tominaga

Proceedings of the 2014 Southwest Symposium on Image Analysis and Interpretation, 2014

An HDR Spectral Imaging System for Time-Varying Omnidirectional Scene.

Keita Hirai, Naoto Osawa, Takahiko Horiuchi, Shoji Tominaga

Proceedings of the 22nd International Conference on Pattern Recognition, 2014

Measurement and Modeling of Bidirectional Characteristics of Fluorescent Objects.

Shoji Tominaga, Keita Hirai, Takahiko Horiuchi

Proceedings of the Image and Signal Processing - 6th International Conference, 2014

Spectral analysis of omnidirectional color signals in natural scenes.

Shoji Tominaga, Daiki Watanabe, Keita Hirai, Takahiko Horiuchi

Proceedings of the Color Imaging XIX: Displaying, 2014

2013

An LED-Based Spectral Imaging System for Surface Reflectance and Normal Estimation.

Keita Hirai, Tetsushi Tanimoto, Kazuya Yamamoto, Takahiko Horiuchi, Shoji Tominaga

Proceedings of the Ninth International Conference on Signal-Image Technology & Internet-Based Systems, 2013

Estimation of Two Illuminant Spectral Power Distributions from Highlights of Overlapping Illuminants.

Nguyen Thuc Dieu Hang, Takahiko Horiuchi, Keita Hirai, Shoji Tominaga

Proceedings of the Ninth International Conference on Signal-Image Technology & Internet-Based Systems, 2013

Investigation of Japanese Onomatopoeias as Features for SHITSUKAN-Based Image Retrieval.

Yuxing Wu, Keita Hirai, Takahiko Horiuchi

Proceedings of the 2013 IEEE International Symposium on Multimedia, 2013

Estimation of bispectral matrix for fluorescent objects.

Shoji Tominaga, Keita Hirai, Takahiko Horiuchi

Proceedings of the Colour and Visual Computing Symposium, 2013

Metal-dielectric object classification by combining polarization property and surface spectral reflectance.

Shoji Tominaga, Hideki Kadoi, Keita Hirai, Takahiko Horiuchi

Proceedings of the Color Imaging XVIII: Displaying, 2013

2012

A LUT-based Method for Recovering Color Signals from High Dynamic Range Images.

Keita Hirai, Shoji Tominaga

Proceedings of the 20th Color and Imaging Conference, 2012

2011

Psychological Effects of Ambient Illumination Control and Illumination Layout While Viewing Various Video Images.

Takuya Iwanami, Ayano Kikuchi, Keita Hirai, Toshiya Nakaguchi, Norimichi Tsumura, Yoichi Miyake

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011

Color Signal Estimation in High Dynamic Range Scenes.

Keita Hirai, Shoji Tominaga

Proceedings of the 19th Color and Imaging Conference, 2011

2010

Video Quality Assessment Using Spatio-Velocity Contrast Sensitivity Function.

Keita Hirai, Jambal Tumurtogoo, Ayano Kikuchi, Norimichi Tsumura, Toshiya Nakaguchi, Yoichi Miyake

IEICE Trans. Inf. Syst., 2010

Measurement and Modeling of Chromatic Spatio-Velocity Contrast Sensitivity Function and its Application to Video Quality Evaluation.

Keita Hirai, Toshiaki Mikami, Norimichi Tsumura, Toshiya Nakaguchi

Proceedings of the 18th Color and Imaging Conference, 2010

2009

Adaptive Ambient Illumination Based on Color Harmony Model.

Ayano Kikuchi, Keita Hirai, Toshiya Nakaguchi, Norimichi Tsumura, Yoichi Miyake

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009

Real reproducing of 3D appearance with multi-projectors and cameras.

Sayuri Kamimigaki, Shoji Yamamoto, Keita Hirai, Norimichi Tsumura, Toshiya Nakaguchi, Yoichi Miyake

Proceedings of the 17th Color and Imaging Conference, 2009

SV-CIELAB: Video Quality Assessment using Spatio-Velocity Contrast Sensitivity Function.

Keita Hirai, Jambal Tumurtogoo, Ayano Kikuchi, Toshiya Nakaguchi, Norimichi Tsumura, Yoichi Miyake

Proceedings of the 17th Color and Imaging Conference, 2009

The relationship between ambient illumination and psychological factors in viewing of display Images.

Takuya Iwanami, Ayano Kikuchi, Takashi Kaneko, Keita Hirai, Natsumi Yano, Toshiya Nakaguchi, Norimichi Tsumura, Yasuhiro Yoshida, Yoichi Miyake

Proceedings of the Color Imaging XIV: Displaying, 2009

2008

Compensation for projected image under dim illumination with CIECAM02.

Sayuri Kamimigaki, Keisuke Taki, Keita Hirai, Shoji Yamamoto, Norimichi Tsumura, Toshiya Nakaguchi, Yoichi Miyake

Proceedings of the 4th European Conference on Colour in Graphics, 2008

2007

Measurement and Modeling of Viewing-Condition-Dependent Spatio-Velocity Contrast Sensitivity Function.

Keita Hirai, Norimichi Tsumura, Toshiya Nakaguchi, Yoichi Miyake

Proceedings of the 15th Color and Imaging Conference, 2007

2006

Photometric HDR video for visual adaptation models.

Keita Hirai, Toshiya Nakaguchi, Norimichi Tsumura, Yoichi Miyake

Proceedings of the International Conference on Computer Graphics and Interactive Techniques, 2006