HIROKAWA Katsuhisa

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Name
HIROKAWA Katsuhisa
Affiliation
Hiroshima Prefectural Technology Research Institute,Eastern Region Industrial Research Center
Degree
Doctor of Engineering(Osaka University)

Research Areas

 
 

Education

 
 
   
 
Department of Material and Life Science, Graduate School of Engineering, Osaka University
 

Published Papers

 
The Illumination Engineering institute of Japan   98(8A) 362   Aug 2014   [Refereed]
A mutual comparison of the measured values of the total␣luminous␣flux between the sphere photometers when using an integrating sphere in which the sizes differ was made, and the consistency was also considered.␣The same total␣luminous␣flux standar...
Bulletin of Hiroshima Prefectural Technology Research Institute, Eastern Region Industrial Research Center   0(23) 14-17   2010
A noble optical fiber system using a DFB-LD light source and a fiber-Bragg-grating (FBG) sensor is proposed. The system can high-speedily measure a strain caused inside of carbon fiber reinforcement plastics (CFRP). Spectrum shift by the FBG sen...
Bulletin of Hiroshima Prefectural Technology Research Institute, Eastern Region Industrial Research Center   0(22) 14-18   2009
The principal parameters of Daugman’s algorithm [U.S. Patent No. 5, 291, 560, 1 March (1994)] generating iris codes for the biometric authentication are clarified. We experimentally demonstrated that the authentication system using the clarified ...
Optical wavelet transform using our LCTV-bused joint transform correlator
Kstsuhisa Hirokawa, Kazuyoshi Itoh and Yoshiki Ichioka
Optics & information Systems, SPIE's Internatio   11(1) 6-7   May 2000   [Invited]
We introduce an optical wave- let transform system that uses the joint transform correlator (JTC)1 configuration.2 The sys- tem can perform a 2D wavelet transform using a liquid crystal television (LCTV) in conjunc- tion with a CCD camera. A new h...
aro Yamaguchi, Katsuhia Hirokawa and Kazuyoshi Itoh
Optics Communications   173(1/6) 107-114   2000   [Refereed]
A novel algorithm is proposed for the independent component analysis (ICA). In the algorithm, ICA is accomplished by geometrical transformation of a scatter diagram. We evaluate the performance of the algorithm by separating original independent i...
Katsuhisa Hirokawa, Kazuyoshi Itoh and Yoshiki Ichioka
Optical Review   7(4) 284-293   2000   [Refereed]
A novel pattern-recognition system that is invariant against scale-, position- and rotation-changes is proposed. The system is composed of an array of modular neural networks with local space-invariant interconnections (FELSI) [Appl. Opt. 29 (1990...
Katsuhisa Hirokawa, Taro Yamaguchi and Kazuyoshi Itoh
Proc. SPIE   3740 142-145   1999   [Refereed]
We propose a novel algorithm for the independent component analysis that reshapes a scatter diagram or the joint probability density function of the pixel values of the mixed signals. The detailed procedure of the algorithm is described and its pe...
Hirokawa K, Itoh K, Ichioka Y
Applied optics   36 1023-1026   Feb 1997   [Refereed]
A novel optical wavelet processor based on the techniques of the joint-transform correlator and computer-generated holograms is proposed. A coding technique that is a simplified version of Lee’s hologram [Appl. Opt. 9, 639 (1970)] is used to repre...
atsuhisa Hirokawa, Kazuyoshi Itoh and Yoshiki Ichioka
Optical Review   4(3) 366-369   1997   [Refereed]
An opto-electronic hybrid system that is based on the joint transform correlator (JTC) is suggested for the implementation of real-time wavelet transform. Holographic encoding of both the object signal and wavelet function enables the JTC-based re...
Evaluation of Digital-Halftoning Techniques for Computer-Generated Holograms
Katsuhia Hirokawa, Kazuyoshi Itoh and Yoshiki Ichioka
Optical Memory and Neural Networks   5 207-293   1996   [Refereed]
Real-time Optical Wavelet transform with Joint Transform Correlator
Katsuhisa Hirokawa, Kazuyoshi Itoh and Yoshiki Ichioka
International Topical Meeting on Optical Computing Technical Digest   1 212-213   1996   [Refereed]
Digital Halftoning for Computer-generated Hologram
Katsuhisa Hirokawa, Kazuyoshi Itoh and Yoshiki Ichioka
Proc. SPIE   2778 529-530   1996   [Refereed]

Misc

 
Evaluation of Digital-Halftoning Techniques for Computer-Generated Holograms
Optical Memory and Neural Networks, 5, 207-293, (1996)   Vol.5, PP.207-293    1996
Independent component analysis based on scatter diagram
Proc. SPIE, 3740, 142-145 (1999)   Vol.3740, PP.142-145    1999
Taro Ymaguchi, Katsuhisa Hirokawa and Kzuyoshi Itoh
Opt. Comm.   173(1/6) 107-114   2000
Opt. Rev., Vol.7, 284-293 (2000)   Vol.7, PP.284-293    2000
Optical wavelet processer by holographic bipolar encoding and joint-transform correlation
Appl, Opt, 36, 1023-1026, (1997)   VOl.36, PP.1023-1026    1997

Conference Activities & Talks

 
Real-time Optical Wavelet-Transform with Joint Transform Correlator
International Topical Meeting on OPTICAL COMPUTING   1996   
Digital Halftoning for Computer-generated Holograms
ICO   1996   
Independent component analysis based on scatter diagram
optical Engineering for Sensing and Nanotechnology   1999   

Research Grants & Projects

 
Noninvasive optical measurement for external, surface and internal structures
Project Year: 2002 - 2005