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Li H.-L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li H.-L.,University of Chinese Academy of Sciences | Guo L.-H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Li X.-M.,Luoyang Institute of Electro Optical Equipment of Aviation Industry Corporation of China | And 2 more authors.
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2013

As the Center-Symmetric Local Binary Pattern (CS-LBP) for the iris recognition has a higher feature dimension and is sensitive to noises, an effective improved method based on Statistical Characteristics Center-symmetric Local Binary Pattern (SCCS-LBP) was proposed. Firstly, a normalized iris image was encoded by CS-LBP according to the distribution characteristics of iris texture, and the statistical characteristics of the encoded image was computed to reduce the feature dimension. Then, the binary feature image of iris was extracted based on statistical results. Finally, the Hamming distance matching vector was obtained to implement the iris recognition. This method was used to CASIA1.0, CASIA2.0, CASIA3.0-Interval and MMU1 database, the results show that the highest correct recognition rates reach respectively 99.955%, 99.848%, 99.989%, and 99.916%. The experimental results demonstrate that this method effectively utilizes the iris texture distribution characteristics, and have the advantages of lower dimension, higher recognition rate and better robustness as compared with LBP and CS-LBP methods. Source


Che H.,Luoyang Institute of Electro Optical Equipment of Aviation Industry Corporation of China | Che H.,Northwest University, China | Fan Y.,CAS Shanghai Institute of Optics and fine Mechanics | Yang Y.,Luoyang Institute of Electro Optical Equipment of Aviation Industry Corporation of China | And 6 more authors.
Guangxue Xuebao/Acta Optica Sinica | Year: 2010

Infrared-transparent glass is one of the key window materials for some important military applications. It 's still a great challenge to fabricate the infrared-transparent glass with high-properties and large size. With the great development of infrared technology and electro-optical countermining technique, the infrared windows with the capacity of radar latent and electro-magnetic shielding (EMS) are essentially required. In this paper, our philosophy is demonstrated to face the challenge in making infrared glass with high-properties and large size, and a new mid-infrared gallium oxyfluoride (FGa) glass is deveosped. Based on FGa glass, some new EMS techniques are developed to make the infrared-windows radar latent. Source


Zhang L.,CAS Shanghai Institute of Optics and fine Mechanics | Chen L.,Luoyang Institute of Electro Optical Equipment of Aviation Industry Corporation of China | Fan Y.,CAS Shanghai Institute of Optics and fine Mechanics | Yang Y.,CAS Shanghai Institute of Optics and fine Mechanics | And 5 more authors.
Guangxue Xuebao/Acta Optica Sinica | Year: 2011

Due to their excellent infrared properties, large-size formability, and low cost, mid-infrared transparent glass become the key window materials for many important military systems. It's still a great challenge to fabricate the IR-transparent glass with high-properties and large size. With the great development of infrared technology and electro-optical countermining technique, the infrared windows with the capacity of radar latent and electro-magnetic shielding (EMS) are essentially required. In this paper, the research progress to face the above challenge is demonstrated and reviewed, especially which are done in our group. The prospect of mid-infrared glasses toward advanced applications is expected. Source


Wang Y.,Luoyang Institute of Electro Optical Equipment of Aviation Industry Corporation of China | Wu X.,Luoyang Institute of Electro Optical Equipment of Aviation Industry Corporation of China | Li X.,Luoyang Institute of Electro Optical Equipment of Aviation Industry Corporation of China | Liu F.,Luoyang Institute of Electro Optical Equipment of Aviation Industry Corporation of China | Tao G.,Luoyang Institute of Electro Optical Equipment of Aviation Industry Corporation of China
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2014

In order to separate the spectrum, dichroic beam splitter has been widely used in various types of the optical system. Based on the infrared dichroic beam splitter of many-spectrum detect systems, the substrate and coating materials are analyzed. Ge and ZnS are chosen as coating materials and Ge as substrate. The initialization configuration of traditional long-wavelength pass filter is optimized by software, and optimum configuration is coated. The spectral performance and environment qualities of infrared dichroic beam splitter are tested. The results show that it meets the requirement of optical system. Such infrared dichroic beam splitter has been successfully applied to many-spectrum detect systems. Source

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