检索结果-内蒙古大学图书馆

Depth-dependent dispersion compensation for full-depth OCT image

OPTICS EXPRESS 2017年第9期25卷 10345-10354页

作者： Pan, Liuhua Wang, Xiangzhao Li, Zhongliang Zhang, Xiangyang Bu, Yang Nan, Nan Chen, Yan Wang, Xuan Dai, Fengzhao Chinese Acad Sci Shanghai Inst Opt & Fine Mech Lab Informat Opt & Optoelect Technol Shanghai 201800 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Jiangnan Univ Sch Sci Wuxi 214122 Peoples R China

A depth-dependent dispersion compensation algorithm for enhancing the image quality of the Fourier-domain optical coherence tomography (OCT) is presented. The dispersion related with depth in the sample is considered. Using the iterative method, an analytical formula for compensating the depth-dependent dispersion in the sample is obtained. We apply depth-dependent dispersion compensation algorithm to process the phantom images and in vivo images. Using sharpness metric based on variation coefficient to compare the results processed with different dispersion compensation algorithms, we find that the depth-dependent dispersion compensation algorithm can improve image quality at full depth. (C) 2017 Optical Society of America

关键词： Effective refractive index image processing algorithms image quality image quality assessment Point spread function Spatial frequency

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Influence of ambient temperature on the modulation transfer function of an infrared membrane diffraction optical system

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APPLIED OPTICS 2018年第30期57卷 9096-9105页

作者： Wang, Dawei Zhi, Xiyang Zhang, Wei Yin, Zhongke Jiang, Shikai Niu, Ruize Harbin Inst Technol Res Ctr Space Opt Engn Harbin 150001 Heilongjiang Peoples R China Inst Remote Sensing Informat Beijing 100192 Peoples R China

In this paper, we present a model that analyzes the influence of the temperature on the modulation transfer function (MTF) of an infrared membrane diffraction optical system. Based on the physical imaging mechanism of diffractive optical systems, the imaging characteristics of the diffraction optical system are characterized by using diffraction efficiency. Then we establish the corresponding calculation model and MTF analysis model based on scalar diffraction theory. In particular, considering the material properties of flexible membrane optical elements and thermal environment effect, the Zernike polynomials are used to establish the thickness distribution model of the membrane diffractive optical components combined with the finite element analysis. After that, we modify the MTF calculation model of diffraction optical system and accordingly propose the model of the infrared membrane diffraction optical system. Finally, we present some experimental results for a 2-m infrared membrane diffraction optical system. The results show that when the temperature is -40 degrees C and wavelength band is 80 nm at the center field of view, the diffraction efficiency is reduced to 81%, and MTF at 751 p/mm is reduced to 0.12. And when the temperature is -40 degrees C at edge field of view, the efficiency at center wavelength is reduced to 71%, and MTF at 751 p/mm is reduced to 0.02. The established model and method can be used to estimate the imaging performance of a space infrared membrane diffractive telescope and provide theoretical guidance for the processing algorithm and imaging system design. (C) 2018 Optical Society of America

关键词： Diffractive optical elements image processing image processing algorithms Optical components Systems design Thermal effects

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Dynamic control of polarization mismatch and coma aberrations in rod-GRIN assemblies

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OPTICS EXPRESS 2019年第10期27卷 14144-14151页

作者： Bagramyan, Arutyun Galstian, Tigran Univ Laval Dept Phys Engn Phys & Opt Ctr Opt Photon & Laser 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada TLCL Opt Res Inc 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada Lensvector Inc 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada

We describe the use of stacked electrically tunable liquid crystal lenses (TLCLs). along with rod gradient index (GRIN) fixed focus lenses, for endoscopic applications. Architectural and driving conditions are found for the optimization of total aberrations of the assembly. Particular attention is devoted to the coma and polarization aberrations. The coma aberration is reduced by stacking two TLCLs with "opposed" pre-tilt angles (all molecules are in the same plane), and then two such doublets are used with cross oriented molecules (in perpendicular planes) to reduce the polarization dependence. The obtained adaptive rod-GRIN lens enables a focus scan over 80 mu m (with exceptionally low RMS aberrations <= 0.16 mu m), making possible the high-qualit), observation of neurons at various depths. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

关键词： Gradient index lenses image processing algorithms image quality Lens design Liquid crystal lenses Rod lenses

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Design of a prism to compensate the angular-shift error of the Acousto-optic Tunable Filter

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OPTICS EXPRESS 2008年第22期16卷 17138-17147页

作者： Ryu, Sung Yoon You, Jang-Woo Kwak, Yoonkeun Kim, Soohyun Korea Adv Inst Sci & Technol Micromechatron & Syst Dynam Lab Taejon South Korea

The Acousto-Optic Tunable Filter (AOTF) is a high-speed full-field monochromator which generates two spectrally filtered light beams with ordinary and extraordinary polarization state. The angle of diffracted light in an AOTF changes according to the scanning of wavelength, which causes an image shift on a CCD plane. An analytic design of a prism system to compensate for the angular-shift error is proposed in this paper. Analysis of light paths in a prism and experimental results verify a proposed compensation method. Experimental results agreed with simulation results based on the suggested prism model. Angular-shift errors of ordinary and extraordinary rays are simultaneously minimized at optimal conditions with the designed prism. (C) 2008 Optical Society of America

关键词： image processing algorithms Light beams Monochromators Optical coherence tomography Polarization Spectral imaging

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Moving target imaging of a dual-channel ISAL with binary phase shift keying signals and large squint angles

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APPLIED OPTICS 2022年第18期61卷 5466-5473页

作者： Cui, Anjing Li, Daojng Wu, Jiang Zhou, Kai Gao, Jinghan Qiao, Ming Wu, Shumei Wang, Yefei Yao, Yuan Chinese Acad Sci Aerosp Informat Res Inst Key Lab Sci & Technol Microwave Imaging Beijing 100190 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Chinese Acad Sci Changchun Inst Opt Fine Mech & Phys Changchun 130033 Jilin Peoples R China

A dual-channel inverse synthetic aperture ladar imaging experimental system based on wide-pulse binary phase coded signals and its moving target imaging are introduced. The analysis, simulation, and experimental data processing results of binary phase coded signal Doppler compensation and pulse compression are included. The method of motion phase error estimation based on interferometric processing and the imaging method with small computation in the case of large squint angles are proposed, and the simulation results are presented. The effectiveness of the imaging method is verified by experimental data processing. Doppler frequency curves are estimated based on time-frequency analysis of echo signals, and the coarse compensation of motion phase error is realized. According to the interferometric phase and coherence coefficient of dual-channel echo signals' time-frequency analysis, the coherence of the dual-channel echo signals is checked, and along-track interferometry can be applied to the precise compensation. The stable interferometric phase and increased coherence coefficient of actual dualchannel data imaging results indicate the effectiveness of the motion phase error compensation method proposed. Considering characteristics of inverse synthetic aperture ladar (ISAL) imaging, after dividing echo signals into multiple sub-apertures, range-Doppler algorithm and sub-aperture stitching are adopted, the stitched image is corrected geometrically through Stolt transformation, and the computation is reduced. (C) 2022 Optica Publishing Group

关键词： Computation methods image processing algorithms Phase compensation Phase shift Pulse compression Synthetic aperture radar

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Spatially selective photonic crystal enhanced fluorescence and application to background reduction for biomolecule detection assays

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OPTICS EXPRESS 2011年第23期19卷 23327-23340页

作者： Chaudhery, Vikram Huang, Cheng-Sheng Pokhriyal, Anusha Polans, James Cunningham, Brian T. Univ Illinois Dept Elect & Comp Engn Urbana IL 61801 USA Univ Illinois Dept Phys Urbana IL 61801 USA Univ Illinois Dept Bioengn Urbana IL 61801 USA

By combining photonic crystal label-free biosensor imaging with photonic crystal enhanced fluorescence, it is possible to selectively enhance the fluorescence emission from regions of the PC surface based upon the density of immobilized capture molecules. A label-free image of the capture molecules enables determination of optimal coupling conditions of the laser used for fluorescence imaging of the photonic crystal surface on a pixel-by-pixel basis, allowing maximization of fluorescence enhancement factor from regions incorporating a biomolecule capture spot and minimization of background autofluorescence from areas between capture spots. This capability significantly improves the contrast of enhanced fluorescent images, and when applied to an antibody protein microarray, provides a substantial advantage over conventional fluorescence microscopy. Using the new approach, we demonstrate detection limits as low as 0.97 pg/ml for a representative protein biomarker in buffer. (C) 2011 Optical Society of America

关键词： Electric fields Fluorescence microscopy image processing image processing algorithms Laser beams Photonic crystals

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Moxifloxacin based axially swept wide-field fluorescence microscopy for high-speed imaging of conjunctival goblet cells

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BIOMEDICAL OPTICS EXPRESS 2020年第9期11卷 4890-4900页

作者： Lee, Jungbin Kim, Seonghan Yoon, Chang Ho Kim, Myoung Joon Kim, Ki Hean Pohang Univ Sci & Technol Dept Mech Engn 77 Cheongam Ro Pohang 37673 Gyeongbuk South Korea Seoul Natl Univ Dept Ophthalmol Coll Med 103 Daehak Ro Seoul 03080 South Korea Seoul Natl Univ Hosp Seoul Artificial Eye Ctr Lab Ocular Regenerat Med & Immunol Biomed Res Inst 101 Daehak Ro Seoul 03080 South Korea Renew Seoul Eye Ctr 528 Teheran Ro Seoul 06181 South Korea

Goblet cells (GCs) in the conjunctiva are specialized epithelial cells producing mucins on the ocular surface. GCs play important roles in maintaining homeostasis of the ocular surface, and GC dysfunction is associated with various complications including dry eye diseases. Current GC examination methods, which are conjunctival impression cytology and confocal reflection microscopy, have limitations for routine examination. Fluorescence microscopy using moxifloxacin was recently introduced as a non-invasive and high-contrast imaging method, but further development is needed to be used for GC examination. Here we developed a non-invasive high-speed high-contrast GC imaging method, called moxifloxacin based axially swept wide-field fluorescence microscopy (MBAS-WFFM). This method acquired multiple fluorescence images with the axial sweeping of the focal plane to capture moxifloxacin labeled GCs on the tilted conjunctival surface in focus and generated all-in-focus images by combining the acquired images. The imaging field of view and imaging speed were increased to 1.6 mm x 1.6 mm and 30 fps. An image processing method was developed for the analysis of GC density. MBAS-WFFM was applied to alkali burn mouse models and detected GC damage and recovery via longitudinal imaging. MBAS-WFFM could assess the status of GCs rapidly and non-invasively. We anticipate MBAS-WFFM to be a starting point for non-invasive GC examination and the diagnosis of GC associated diseases. For example, MBAS-WFFM could be used to classify dry eye diseases into detail categories for effective treatment. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

关键词： Fluorescence microscopy High speed imaging image processing image processing algorithms Imaging techniques Three dimensional imaging

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Integrated multi-channel optical system for bacteria characterization and its potential use for monitoring of environmental bacteria

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BIOMEDICAL OPTICS EXPRESS 2019年第3期10卷 1165-1183页

作者： Buzalewicz, Igor Suchwalko, Agnieszka Trzcinski, Pawel Sas-Paszt, Lidia Sumorok, Beata Kowal, Katarzyna Kozera, Ryszard Wieliczko, Alina Podbielska, Halina Wroclaw Univ Sci & Technol Fac Fundamental Problems Technol Dept Biomed Engn Bioopt Grp 27 Wybrzeze S Wyspianskiego St Wroclaw Poland QUANTUP 30-9 Litewska St Wroclaw Poland Res Inst Hort Agrotech Dept Rhizosphere Lab 1-3 Konstytucji 3 Maja St Skierniewice Poland Warsaw Univ Life Sci SGGW Fac Appl Informat & Math 159 Nowoursynowska St Warsaw Poland Univ Western Australia Sch Comp Sci & Software Engn 35 Stirling Highway Perth WA 6009 Australia Wroclaw Univ Environm & Life Sci Clin Inject Dis Dept Epizootiol & Vet Adm 45 Grunwaldzki Sq Wroclaw Poland

The potential use of a novel multichannel optical system towards fast and nondestructive bacteria identification and its application for environmental bacteria characterisation on the strain level is presented. It is the first attempt to use the proposed optical method to study various bacteria species (Gram-negative, Gram-positive) commonly present in the environment. The novel configuration of the optical system enables multichannel examination of bacterial colonies and provides additional functionality such as registration of two-dimensional (2D) distribution of monochromatic transmission coefficient of examined colonies, what can be used as a novel optical signature for bacteria characterization. Performed statistical analysis indicates that it is possible to identify representatives of environmental soil bacteria on the species level with the 98.51% accuracy and in case of two strains of Rahnella aquatilis bacteria on the strain level with the 98.8% accuracy. The proposed method is an alternative to the currently used preliminary bacteria examination in environment safety control with the advantage of being fast, reliable, nondestructive and requiring minimal sample preparation. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

关键词： image processing image processing algorithms Light diffraction Light transmission Ptychography Transmission coefficient

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Performance evaluation of an implantable sensor for deep brain imaging: an analytical investigation

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OPTICAL MATERIALS EXPRESS 2019年第9期9卷 3729-3737页

作者： Nazempour, Roya Liu, Changbo Chen, Yuwen Ma, Cheng Sheng, Xing Tsinghua Univ Beijing Natl Res Ctr Informat Sci & Technol Dept Elect Engn Beijing 100084 Peoples R China Tsinghua Univ IDG McGovern Inst Brain Res Beijing 100084 Peoples R China

Imaging neural activities at the cellular level in the deep brain is essential to understand the structure and functions of nervous systems. Recently developed fully implantable optical sensors have the capability to capture fluorescence signals within the deep tissue;however, their potential for high-quality imaging is not clear. In this paper, we develop a simplified model to analytically study the photon transport in the biological tissue, and utilize it to understand the optical performance of an implantable fluorescence imager. Spatial resolution of the implanted imager is calculated, and imaging qualities for groups of neurons in two- and three-dimensional configurations are evaluated. The results here establish feasible solutions to design implantable optical sensors and predict their performance for biomedical applications. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

关键词： Green fluorescent protein image processing algorithms image quality image sensors Magnetic fields X ray computed tomography

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Robust-cognitive methods for processing digital images obtained with remote probing

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JOURNAL OF OPTICAL TECHNOLOGY 1999年第8期66卷 695-701页

作者： Buznikov, AA Gorokhov, VL Logachev, YV Andreev, MV St Petersburg State Elect Engn Univ St Petersburg Russia

This paper gives a brief review of prospects in the area of cognitive computer graphics and robust decision-making methods for processing optical signals. A combination of these approaches is proposed that provides a qualitatively new effect of stimulation and actualization of the intuitive and empirical knowledge of the users of remote probing systems. A qualimetric estimate is proposed for the information product of the integration of the subjective knowledge of the operator and the objective data of the image processing. Using a specific practical example, the possibility of combining these approaches is demonstrated. (C) 1999 The Optical Society of America. [S1070-9762(99)00608-9].

关键词： Computer simulation Digital image processing Digital imaging image detection systems image processing image processing algorithms

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