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| 1 | Shape description matrix and its applications to color-image retrieval and recognition显示文摘Shape description matrix (SDM) describing regional pixel distribution characteristics of images is defined, with both radial and angular distribution messages taken into account to offer a comprehensive and exact description of the shape characteristics even upon a blurred edge. Using this SDM, a general color histogram (GCH) is developed. Both theoretical and experimental results show that the GCH can be applied to color-image retrievals and recognitions with a high efficiency. | WANG Yi,ZHAI Hongchen,LIANG Yanmei,ZHANG Siyuan & MU Guoguang Institute of Modern Optics,Nankai University,Tianjin 300071,China Key Laboratory of Information Sci-ence and Technology MOE,Tianjin 300071,China | 2004 | Science China(Technological Sciences)2004，47，2： | 3 |
| 2 | Diffraction Properties of Transmission Photorefractive Volume Gratings in Ce: KNSBN Crystal 显示文摘 | Baolai Liang Zhaoqi Wang Guoguang Mu | 1999 | Applied Optics1999，38，26： | 1 |
| 3 | Optical study on the vision correction and supernormal vision based on the wave-front aberrations of human eye显示文摘In this paper we present the recent research results in the field of vision correction and supernormal vision according to the actual measurements of the wave-front aberrations and the corneal surface topography,the clinical detection of the visual function and the laser corneal refractive surgery,and the optimization of the optical system. These include the features of the aberrations of human eye with different pupil sizes,different fields of view and temporal accommodation,the influence of the polychromatic illumination of the visible wavelength on the supernormal vision,and the effect of the existing laser corneal refractive surgery on the wave-front ab-errations of the eye. It is shown that the wave-front aberration of human eye is of temporal variation and of synthesis with multi impact factors. To achieve super-normal vision,an optimum engineering data for the customized laser corneal sur-gery should be firstly acquired,which may involve the dynamic free-form optical surface. Although the myopia can be corrected by the laser in situ keratomileusis(LASIK) in a certain degree,it brings about negative effects under scotopic condi-tions. | MU GuoGuang WANG ZhaoQi LIU YongJi QUAN Wei WANG Yang WANG Wei | 2007 | Science China(Technological Sciences)2007，50，3： | 1 |
| 4 | Refractive-diffractive visual system for micro-display of LCOS显示文摘One head-mounted display visual system for computer entertainment and three-dimensional display of virtual-reality was achieved, which consists of a hybrid re-fractive-diffractive eyepiece and a relay reflector. It can be used in micro-display of liquid crystal on silicon (LCOS) diagonal of 18 mm. The whole system has better performance, with 60° field of view, 10 mm exit pupil, 23 mm eye relief, and reduces weight and size. | ZHAO Qiuling WANG Zhaoqi MU Guoguang LU Zhenwu | 2002 | Chinese Science Bulletin2002，47，16： | 1 |
| 5 | Diffraction property of transmission photorefractive volume grating in Ce:KNSBN crystal显示文摘 | LIANG BAOLAI WANG ZHAOQI MU GUOGUANG | 1999 | Appl Opt1999，38，： | 1 |
| 6 | Phase-shifting technique applied to circular harmonic-based joint transform correlator显示文摘The phase-shifting technique is applied to the circular harmonic expansion-based jointtransform correlator. Computer simulation has shown that the light efficiency and the discrimination capability are greatly enhanced, and the full rotation invariance is preserved after the phase-shifting technique has been used. A rotation-invariant optical pattern recognition with high discrimination capability and high light efficiency is obtained. The influence of the additive noise on the performance of the correlator is also investigated. However, the anti-noise capability of this kind of correlator still needs improving. | Jiuhong Guan Zhaoqi Wang Hongli Liu Baolai Liang Guoguang Mu | 2000 | Chinese Science Bulletin2000，45，20： | 0 |
| 7 | A method to design aspheric spectacles for correction of high-order aberrations of human eye显示文摘Aiming at the correction of high-order aberrations of human eye with spectacles, a design method of aspheric spectacles is proposed based on the eye's wavefront aberrations data. Regarding the eyeball and the spectacles as a whole system-the lens-eye system-the surface profiles of the spectacles are achieved by optimization procedure of lens design. Different from the conventional optometry, in which the refraction prescription is acquired with a visual chart, the design takes into account the two aspects of actual human viewing, eyeball rolling and certain distinct viewing field. The rotation angle of eyeball is set to be ±20° as wearing spectacles, and the field of view is set to be ±7° which is especially important as watching screen display. The individual eye model is constructed as the main part of the lens-eye system. The Liou eye model is modified by sticking a thin meniscus lens to the crystalline lens. Then the defocus of the individual eye is transferred to the front surface of the meniscus lens, and the astigmatism and high-order aberrations are transferred to the front surface of the cornea. 50 eyes are involved in this research, among which 36 eyes have good enough visual performance already after sphero-cylindrical correction. 10 eyes have distinct improvement in vision and 4 eyes have no visual improvement by further aspheric correction. 6 typical subject eyes are selected for the aberrations analysis and the spectacles design in this paper. It is shown that the validity of visual correction of aspheric lens depends on the characteristics of the eye's wavefront aberrations, and it is effective for the eye with larger astigmatism or spherical aberration. Compared with sphero-cylindrical correction only, the superiority taken by the aspheric correction is mainly on the improvement of MTF at a larger field of view. For the best aspheric correction, the MTF values increase by 18.87%, 38.34%, 44.36%, 51.29% and 57.32% at the spatial frequencies of 40, 80, 100, 125 and 150 cycles/mm, respectively. | LI Rui WANG ZhaoQi LIU YongJi MU GuoGuang | 2012 | Science China(Technological Sciences)2012，55，5： | 0 |
| 8 | Study of an athermal infrared dual band optical system design containing harmonic diffractive element显示文摘A harmonic diffractive element (HDE) is first successfully introduced to the athermal system of infrared dual band in this paper. In this system, there are only three lens and two materials, silicon and germanium. When the temperature ranges from 70℃ to 100℃ in the dual band, it can simultaneously accomplish the rectification of the longitudinal aberration in the big field of view, as well as the wave front aberration less than 1/4 wavelength. Modulation transfer function of dual band approaches or attains the diffraction limit. The calculation results show that the spec-tral properties of the HDE are between refractive and dif-fractive elements, so we can design a simple dual-band and athermal optical system by selecting the thickness and cen-tral wavelength of the HDE exactly. Compared with a con-ventional refractive optical system, this system not only re-duces the demand for high technical levels, but also has a compact structure, few elements, a high transmittance better aberrations performances and athermal character. At the same time, the use of the HDE also offers a new element for the infrared optics design. | SUN Qiang WANG Zhaoqi LI Fengyou LIU Hongli LU Zhenwu CHEN Bo MU Guoguang | 2003 | Chinese Science Bulletin2003，48，12： | 0 |
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