Ibaraki University's
College of Engineering
Department of Media and Telecommunications Engineering

Associate Professor

UNO Katsuhiro


Other affiliation / position

  1. Frontier Research Center for Applied Atomic Sciences

Career

  1. Institute for Life Support Technology Yamagata Technopolis Foundation, Researcher 1995/04-1998/03
  2. Ibaraki University, Lecturer 1998/04-2002/05
  3. Ibaraki University, Assistant Professor 2002/06-Present

Academic background

  1. Hokkaido University Graduate School, Division of Engineering Major in Electronic Engineering Doctor course 1995 Completed
  2. Hokkaido University Faculty of Engineering Department of Electronic Engineering Graduated

Academic degrees

  1. Doctor (Engineering) Hokkaido University

Research Areas

  1. Applied Optics and Quantum Optics
  2. Measurement Engineering

Research keywords

  1. diffraction, scattering, Optical information processing, Optical measurements

Subject of research

  1. Optical Information Processing 1997-Present
  2. Optical measurement 1997-Present

Papers

  1. Research paper (scientific journal) Joint Image Encryption Based on Phase Decomposition Technique Katsuhiro Uno, Hoang Hoa Tien Dung Journal of the Institute of Industrial Applications Engineers Institute of Industrial Applications Engineers 5/ 2, 53-58 2017/04/25 2188-1758 10.12792/JIIAE.5.53 Novel technique for image encryption, which is based on a phase decomposition of the optical wave, and for decryption with an interferometric technique, was proposed. The phase decomposition was successfully performed by splitting pixel brightness into two vectors with random phases. The two encrypted images have constant amplitude and purely random phase, so that no one could see existence of the image. The hidden image was recovered by superposing and interfering with the two encrypted images. The decrypted image was exactly the same as the original with no noise. Our technique was applicable not only to binary images but also to grayscale images. We confirmed our technique by the computer simulation.
  2. Research paper (international conference proceedings) Joint Image Encryption Based on Phase Decomposition Technique Katsuhiro Uno, Hoang Hoa Tien Dung Proceedings of the 4th IIAE International Conference on Intelligent Systems and Image Processing 2016 The Institute of Industrial Applications Engineers 192-198 2016/09/08 Novel techniques for image encryption, which is based on a phase decomposition of the complex amplitude, and for ecryption with an interferometry were proposed. The phase decomposition was successfully performed by retarding or progressing the random phase along the pixel brightness information of the image that should be encrypted. The obtained images that were encrypted were purely random phase images with constant amplitude, so that no one could see the meaning of the image. The hidden image could be recovered only by the interferometric technique. The decrypted image was exactly the same image as the original one without any noise. Our technique can be applied not only to binary images but also to grayscale images. We confirmed our technique in the computer simulation.
  3. Research paper (scientific journal) Joint Visual Cryptography by Speckle Pattern Illumination Katsuhiro Uno, Hoan Hoa Tien Dung Jounal of the Institute of Industrial Applications Engineers Institute of Industrial Applications Engineers 4/ 1, 26-32 2016/01/25 2187-8811 10.12792/JIIAE.4.26 We used for the first time the speckle pattern created by the scattered laser beam from rough surfaces in order to perform the visual secret sharing (visual cryptography), which is alternative material for random grid pattern. Segmentation and binarization of the speckle pattern was performed for making one share embedding secret image. Reconstruction of the secret image was successfully achieved by the product between the share and the original speckle pattern.
  4. Research paper (international conference proceedings) Joint Visual Secret Sharing by Speckle Pattern Illumination Katsuhiro Uno, Hoang H. T. Dung Proceedings of the 3rd IIAE International Conference on Intelligent Systems and Image Processing 2015 100-105 2015/09/03
  5. Research paper (scientific journal) Joint Dual Focus Diffractive Optical Element with Extended Depth of Focus Katsuhiro Uno, Isao Shimizu Optical Review 21/ 5, 668-675 2014 A dual focus property and extended depth of focus were verified by a new type of diffractive lens displaying on liquid crystal on silicon devices.

Research presentations

  1. Oral presentation(general) Visual Secret Sharing by Speckle Pattern Illumination The 3rd IIAE International Conference on Intelligent Systems and Image Processing 2015 2015/09/02 レーザーを粗面に照射することにより発生するスペックルを用いて、画像の暗号化を行い、同じスペックルパターンで複合できることを示した。
  2. Oral presentation(general) Matched Spatial Filtering of Phase Objects with Liquid Crystal on Silicon (LCoS) Device 電気学会東京支部茨城支所発表会 2014/11/22
  3. Oral presentation(general) Optical Detection of Defects on Porous Surfaces 電気学会東京支部茨城支所発表会 2014/11/22
  4. Oral presentation(general) Matched Spatial Filtering of phase objects with Liquid Crystal on Silicon Device JSAP-OSA Joint Symposia 2014/09/18
  5. Oral presentation(general) Optical Detection of Defects on Porous Surfaces JSAP-OSA Joint Symposia 2014/09/18

Intellectual property rights

  1. Patent 電子スピン共鳴の測定法および電子スピン共鳴測定装置 H8-255858 1996/09/27 H10-104181 1998/04/24

Alloted class

  1. Experiment II of Media and Telecommunications Engineering
  2. Information Processing
  3. Media and Telecommunications Experiment III

Memberships of academic societies

  1. Optical Society of America
  2. Japan Society of Applied Physics
  3. The international society for optics and photonics 2012/12/19-Present