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Smearing model and restoration of star image under conditions of variable angular velocity and long exposure time

OPTICS EXPRESS 2014年第5期22卷 6009-6024页

作者： Sun, Ting Xing, Fei You, Zheng Wang, Xiaochu Li, Bin Tsinghua Univ Dept Precis Instrument Beijing 100084 Peoples R China Tsinghua Univ State Key Lab Precis Measurement Technol & Instru Beijing 100084 Peoples R China Tsinghua Univ Collaborat Innovat Ctr Micro Nano Fabricat Device Beijing 100084 Peoples R China

The star tracker is one of the most promising attitude measurement devices widely used in spacecraft for its high accuracy. High dynamic performance is becoming its major restriction, and requires immediate focus and promotion. A star image restoration approach based on the motion degradation model of variable angular velocity is proposed in this paper. This method can overcome the problem of energy dispersion and signal to noise ratio (SNR) decrease resulting from the smearing of the star spot, thus preventing failed extraction and decreased star centroid accuracy. Simulations and laboratory experiments are conducted to verify the proposed methods. The restoration results demonstrate that the described method can recover the star spot from a long motion trail to the shape of Gaussian distribution under the conditions of variable angular velocity and long exposure time. The energy of the star spot can be concentrated to ensure high SNR and high position accuracy. These features are crucial to the subsequent star extraction and the whole performance of the star tracker. (C)2014 Optical Society of America

关键词： Dispersion image processing image processing algorithms image restoration image sensors Point spread function

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image alignment of historical and current Cebu maps to determine river path changes and flooding pattern 8

Image alignment of historical and current Cebu maps to deter...

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2015 International Conference on Humanoid, Nanotechnology, Information Technology,Communication and Control, Environment and Management (HNICEM)

作者： Gallanosa, Phoebe B. Soriano, Maricor N. Univ Philippines Natl lnst Phys Quezon City Philippines

ISBN: (纸本)9781509003600

Two historical maps of Cebu City dated 1833 and 1873 were digitized and piecewise linearly transformed to align street maps with current Google Maps of the city. The calculated RMS errors of the transformed maps are established to be comparable with other studies. Disappearance of water basins and river path changes were observed in the current map. Overlaying a flood hazard map on the transformed historical maps reveals a correlation between sites of reclamation and river path changes with current flood prone areas. Old maps can inform land use planners about ancient water ways that can become flooding hazards if improperly managed.

关键词： image processing algorithms historical maps image transformation flooding hazards

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FPGA Infrastructure for the Development of Augmented Reality Applications 07

FPGA Infrastructure for the Development of Augmented Reality...

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20th Symposium on Integrated Circuits and Systems Design

作者： Guimaraes, Germano F. Lima, Joao P. S. M. Teixeira, Joao M. X. N. Silva, Guilherme D. Teichrieb, Veronica Kelner, Judith Univ Fed Pernambuco Ctr Informat BR-50732970 Recife PE Brazil

ISBN: (纸本)9781595938169

In this paper, we describe a platform that aims to help developers on the construction of embedded AR applications. The infrastructure is based on Field Programmable Gate Array and enables the creation of hardware based AR systems, contributing to high speed processing and low power consumption. In addition, the platform uses a componentized design model, where the steps needed to develop an AR application consist in combining the necessary components. A number of image processing algorithms have been implemented and some AR applications have been created using this infrastructure in order to demonstrate the platform capabilities. The performance obtained with the hardware version (at 100 MHz) of the algorithms has also been compared with their software counterparts (at 2 GHz).

关键词： FPGA image processing algorithms Augmented Reality Real Time

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Application of on-line gauging for closed loop process control

Application of on-line gauging for closed loop process contr...

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Conference on Machine Vision Applications, Architectures, and Systems Integration VI

作者： Kemmerer, R Acuity Imaging Inc. (United States)

ISBN: (纸本)0819426377

An application case history is detailed where machine vision was implemented in a closed loop process control setting. Specifically, a machine vision system was used to measure dimensions on aseptic packaging. These dimensions were then compared to a nominal value and an error signal was generated based on the measurement deviation from nominal. This error signal was generated by the vision system in the form of a -10Vdc to 10Vdc analog signal proportional to the measurement deviation. In addition, the application made use of low angle lighting techniques, normalized correlation, and automatic part changeover and calibration.

关键词： machine vision process control error signal low angle lighting normalized correlation image processing algorithms packaging inspection

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Mobile Microscope for Quantitative Fluorescence Sensing Through Highly Autofluorescent and Scattering Media

Mobile Microscope for Quantitative Fluorescence Sensing Thro...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Gorocs, Zoltan Rivenson, Yair Koydemir, Hatice Ceylan Tseng, Derek Troy, Tamara L. Demas, Vasiliki Ozcan, Aydogan Univ Calif Los Angeles Dept Elect Engn Los Angeles CA 90095 USA Univ Calif Los Angeles Dept Bioengn Los Angeles CA 90095 USA Univ Calif Los Angeles Calif NanoSyst Inst CNSI Los Angeles CA 90095 USA Verily Life Sci LLC Mountain View CA 94043 USA

We created a mobile fluorescence microscope weighing <40 grams and demonstrated a computational sensing method for quantitative measurement of fluorescent dyes through highly autofluorescent, scattering and absorbi... 详细信息

ISBN: (纸本)9781943580279

关键词： Computation methods Diode lasers Fluorescence microscopy image processing image processing algorithms Scattering media

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Hyperspectral Imaging Technology and Systems, Exemplified by Airborne Real-time Target Detection

Hyperspectral Imaging Technology and Systems, Exemplified by...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Skauli, Torbjorn Haavardsholm, Trym Kasen, Ingebjorg Opsahl, Thomas Kavara, Amela Skaugen, Atle Norwegian Def Res Estab FFI N-2027 Kjeller Norway

Hyperspectral imaging exploits the information contained in the spectrum of light, and has many applications. Systems require specialized cameras and application-specific image processing. As an example, we describe a... 详细信息

ISBN: (纸本)9781557529107

关键词： Hyperspectral image processing Hyperspectral imaging image processing image processing algorithms Imaging spectroscopy Polarimetric imaging Motion, hyperspectral image processing (100.4145) Multispectral and hyperspectral imaging (110.4234) Passive remote sensing (280.4991)

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Computer Aided Detection of Dental Implant Crown Defects

Computer Aided Detection of Dental Implant Crown Defects

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7th International Advances in Applied Physics and Materials Science Congress and Exhibition (APMAS)

作者： Bocekci, V. G. Demir, O. Marmara Univ Fac Technol Dept Elect & Elect Engn TR-34722 Istanbul Turkey

A dental implant is an artificial tooth root that is placed into to hold a replacement tooth or bridge. Crown is the apparent part of the dental implant. Detection of crown defects is important for health of the patient before the surgery. In this study, a computer aided detection system developed to analyze tooth dental implant crown digital images to detect defects. The developed system detects various implant defects such as fractures, cracks, dents, spots and roughness. Micro fractures are detected using morphologic operations by the system. Dents and spots are also detected using this image processing techniques. Textural analysis can be performed on digital images to detect different roughness and porosity areas on dental implant. The developed system prevents waste of time and decreases costs. Using the system also will increase patients' satisfaction.

关键词： structural failure of materials image analysis image processing algorithms

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Optimization of Illumination Frequency and Preclinical Validation of a Wide-field Structured Illumination Microscope Designed for Imaging in situ Tumor Margins

Optimization of Illumination Frequency and Preclinical Valid...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Fu, Henry L. Mueller, Jenna L. Javid, Melodi Kirsch, David G. Ramanujam, Nimmi Brown, J. Quincy Duke Univ Dept Biomed Engn Durham NC 27708 USA Duke Univ Sch Med Dept Pharmacol & Canc Biol Durham NC 27710 USA Duke Univ Sch Med Dept Radiat Oncol Durham NC 27710 USA Tulane Univ Dept Biomed Engn New Orleans LA USA

We present a widefield structured illumination microscope for imaging surgical tumor margins in situ. The impact of frequency and turbidity on optical section thickness and SNR was characterized to determine the optim... 详细信息

ISBN: (纸本)9781557529732

关键词： Biological imaging Illumination design image processing algorithms Multiple scattering Spatial light modulators Structured illumination microscopy Fluorescence microscopy (170.2520) Medical and biological imaging (170.3880) Medical optics instrumentation (170.3890)

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A New Shear Wave Imaging System for Ultrasound Elastography 37

A New Shear Wave Imaging System for Ultrasound Elastography

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37th Annual International Conference of the IEEE-Engineering-in-Medicine-and-Biology-Society (EMBC)

作者： Qiu, Weibao Wang, Congzhi Xiao, Yang Qian, Ming Zheng, Hairong Chinese Acad Sci Shenzhen Inst Adv Technol Paul C Lauterbur Res Ctr Biomed Imaging Shenzhen 518055 Peoples R China

ISBN: (纸本)9781424492701

Ultrasound elastography is able to provide a non-invasive measurement of tissue elasticity properties. Shear wave imaging (SWI) technique is a quantitative method for tissue stiffness assessment. However, traditional SWI implementations cannot acquire 2D quantitative images of tissue elasticity distribution. In this study, a new shear wave imaging system is proposed and evaluated. Detailed delineation of hardware and image processing algorithms are presented. Programmable devices are selected to support flexible control of the system and the image processing algorithms. Analytic signal based cross-correlation method and a Radon transform based shear wave speed determination method are proposed with parallel computation ability. Tissue mimicking phantom imaging, and in vitro imaging measurements are conducted to demonstrate the performance of the proposed system. The system has the ability to provide a new choice for quantitative mapping of the tissue elasticity, and has good potential to be implemented into commercial ultrasound scanner.

关键词： SWI Ultrasound Elastography image processing algorithms image processing algorithm SMARCA1 gene SEISMIC S WAVES ultrasound scanner Elasticity Imaging Techniques Imaging systems control systems correlation methods

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End-Fire Silicon Optical Phased Arrays for Infrared Neural Stimulation Applications

End-Fire Silicon Optical Phased Arrays for Infrared Neural S...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Kossey, Michael R. Alt, Shannon Rizk, Charbel Foster, Amy C. Johns Hopkins Univ Dept Elect & Comp Engn Baltimore MD 21218 USA

We propose infrared neural stimulation as an application for end-fire integrated optical beam steering devices. We show some initial results and discuss its implications for the future development of the technique.

ISBN: (纸本)9781943580279

关键词： Array waveguide devices Beam steering image processing algorithms Laser light Light beams Phased arrays

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