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7th international conference on recent advances in Space Technologies (RAST)

作者： Yilmaz, Ozgur Unses, Emre Ucan, Meric Buyuk, Hakan Celebi, Muhammet Turk, Fethi Kirik, M. Sancay Haliloglu, Onur Celik, Vakkas Ekinci, Mustafa Guven, Erol Yilmaz, Ozan Acar, derya Aydogdu, M. Fatih Olca, Mert Selimoglu, Ozgur TUBITAK Uzay Space Technol Res Inst Electroopt Syst Grp TR-06531 Ankara Turkey

ISBN: (纸本)9781479976973

Tubitak Uzay has started a spaceborne hyperspectral imager development project two years ago. As hyperspectral remote sensing is getting popular, Tubitak Uzay has R&d projects both on hardware development and software applications of hyperspectral imaging. Project is at the PdR level now. Many trade-off cases are evaluated during the system engineering and preliminary design phases. We are presenting a summary of trade-off cases and lessons learnt during those studies. Optical, mechanical and electronical designs are also shown at the end of paper.

关键词： Hyperspectral imager HSK PdR (Preliminary design Review) SNR (Signal to Noise Ratio) OSF (Order Sorting Filter) AdC (Analog to digital Converter)

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Accuracy assessment of digital elevation model generated from pleiades tri stereo-pair

Accuracy assessment of digital elevation model generated fro...

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international conference on recent advances in Space Technologies (RAST)

作者： Salman Nasir Irfan Akhtar Iqbal Zahir Ali Atif Shahzad Physics of Molecular Imaging Systems RWTH Aachen University Hospital Aachen Germany Philips Research Europe Aachen Germany Experimental Molecular Imaging RWTH Aachen University Hospital Aachen Germany

digital Elevation Model (dEM) is crucial for several purposes like town planning, hydrological analysis, land sliding, flash floods, earthquake, road construction, surface analysis, ortho-rectification of satellite imagery, 3d visualization, precise farming and forestry, base mapping, flight simulation and disaster management. Pleiades is a French constellation of very high resolution satellites. It acquires both panchromatic as well as multispectral imagery in Visible Near Infra-red (VNIR) range. The added benefit of Pleiades is that it provides tri stereo-pair imagery at 0.5m spatial resolution, unlike its other contemporary systems like Quickbird and IKONOS. Tri stereo-pair is used for digital Terrain Model (dTM) and digital Surface Model (dSM) extraction because of its backward and forward look angles. Moreover, Pleiades provides Rational Polynomial Coefficient (RPC) and sensor model data which augment the accuracy of its 3d products. Being a newly launched system, it provides fertile field for researchers to analyze the strengths and weaknesses of this system. This study explores the potential of Pleiades Tri stereo-pair in generating high resolution dEM, and comparing its accuracy with Shuttle Radar Topography Mission (SRTM) and Advanced Space Thermal Emission Radiometer (ASTER). In this study, data from space borne LidAR (ICESat/GLAS) was used as a reference due to its reported unprecedented accuracy. Comparison of Pleiades with LidAR resulted in an R2 of 0.92 with an RMSE of 5.2m. Similarly, comparison of SRTM and ASTER resulted in an R2 of 0.74 (RMSE 7.5m) and R2 0.84 (RMSE 6.6m), respectively.

关键词： Laser radar Accuracy Satellites Correlation Surface topography Satellite broadcasting Measurement

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Coded aperture compressive 3-d LIdAR

Coded aperture compressive 3-D LIDAR

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IEEE international conference on Acoustics, Speech and Signal Processing

作者： A. Kadambi P. T. Boufounos Media Lab. Massachusetts Inst. of Technol. (MIT) Cambridge MA USA

ISBN: (纸本)9781467369985

Continuous improvement in optical sensing components, as well as recent advances in signal acquisition theory provide a great opportunity to reduce the cost and enhance the capabilities of depth sensing systems. In this paper we propose a new depth sensing architecture that exploits a fixed coded aperture to significantly reduce the number of sensors compared to conventional systems. We further develop a modeling and reconstruction framework, based on model-based compressed sensing, which characterizes a large variety of depth sensing systems. Our experiments demonstrate that it is possible to reduce the number of sensors by more than 85%, with negligible reduction on the sensing quality.

关键词： 3-d imaging LIdAR compressed sensing computational imaging time of flight Compressed sensing Lidar Three dimensional imaging TIME OF FLIGHT Sensors apertures Continuous improvement

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A simple and efficient approach for medical image security using chaos on EZW

A simple and efficient approach for medical image security u...

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international conference on advances in Pattern Recognition (ICAPR)

作者： Ch. Naveen T Venkata Sainath Gupta V. R. Satpute A. S. Gandhi VNIT Nagpur

In this digital era medical image security is important as they carry highly personal data, which should be kept away from the hackers and unauthorized persons, as these images are transmitted/stored among hospitals and also by health insurance companies. Chaos based cryptography/security has been increased in recent years. In this paper we proposed an algorithm, in which security can be given along with effective compression of image. Our process of providing image security starts with compressing the image using EZW. The output sequence of EZW is converted to 2d and on the 2d data we are going to apply row wise and column wise scrambling algorithm based on chaos. In this paper we are also going to discuss about part of EZW in providing additional security to image along with its main function of compression.

关键词： Image coding Chaos Security Image reconstruction Biomedical imaging decoding discrete wavelet transforms

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The Primary Reconstruction of Three-dimensional(3d) digital Model of Intracranial Aneurysm(IA) with Fenestration Based on Raw data of Computed Tomography(CT) imaging

The Primary Reconstruction of Three-Dimensional(3D) Digital ...

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2015 4th international conference on Computer, Mechatronics, Control and Electronic Engineering (ICCMCEE 2015)

作者： Yijun LIU Rui LI Weijian CHEN Nengzhi XIA Pengcheng YE Yuxia dUAN Yunjun YANG Meshram Manmeet Manohar Department of Radiology The First Affiliated Hospital Wenzhou Medical University Department of Stomatology The First Affiliated Hospital Wenzhou Medical University Department of Orthopaedics The First Affiliated Hospital Wenzhou Medical University

ISBN: (纸本)9781510813465

The diagnostic value of fenestration itself is limited but it is quite different when fenestration is accompanied by IA. In recent years, the reconstruction model of IA has become the domestic and international hot topic for discussion, however, it is rare to see the research about reconstruction model of IA with fenestration. Based on reliable CT imaging technologies and optimized modeling methods, we successfully reconstruct the 3d digital model of IA with fenestration by applying Mimics software combined with Geomagic studio software. This model can provide a necessary condition for the 3d finite element reconstruction model and computational fluid dynamic analysis, open a new approach for relative clinical hemodynamic study and operative treatment.

关键词： Intracranial Aneurysm Fenestration 3d digital Model Reconstruction Computed Tomography

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Techniques in helical scanning, dynamic imaging and image segmentation for improved quantitative analysis with X-ray micro-CT

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NUCLEAR INSTRUMENTS & METHOdS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS ANd ATOMS 2014年 324卷 49-56页

作者： Sheppard, Adrian Latham, Shane Middleton, Jill Kingston, Andrew Myers, Glenn Varslot, Trond Fogden, Andrew Sawkins, Tim Cruikshank, Ron Saadatfar, Mohammad Francois, Nicolas Arns, Christoph Senden, Tim Australian Natl Univ Dept Appl Math Res Sch Phys & Engn Canberra ACT 0200 Australia Univ New S Wales Sch Petr Engn Sydney NSW 2052 Australia

This paper reports on recent advances at the micro-computed tomography facility at the Australian National University. Since 2000 this facility has been a significant centre for developments in imaging hardware and associated software for image reconstruction, image analysis and image-based modelling. In 2010 a new instrument was constructed that utilises theoretically-exact image reconstruction based on helical scanning trajectories, allowing higher cone angles and thus better utilisation of the available X-ray flux. We discuss the technical hurdles that needed to be overcome to allow imaging with cone angles in excess of 60 degrees. We also present dynamic tomography algorithms that enable the changes between one moment and the next to be reconstructed from a sparse set of projections, allowing higher speed imaging of time-varying samples. Researchers at the facility have also created a sizeable distributed-memory image analysis toolkit with capabilities ranging from tomographic image reconstruction to 3d shape characterisation. We show results from image registration and present some of the new imaging and experimental techniques that it enables. Finally, we discuss the crucial question of image segmentation and evaluate some recently proposed techniques for automated segmentation. (C) 2014 Elsevier B.V. All rights reserved.

关键词： dynamic tomography Helical cone-beam tomography Micro-computed tomography Image registration Image segmentation

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Effect of micro-scale morphological parameters on meso-scale response of Asphalt Concrete

Effect of micro-scale morphological parameters on meso-scale...

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12th ISAP international conference on Asphalt Pavements

作者： Onifade, Ibrahim Jelagin, denis Guarin, Alvaro Birgisson, Bjorn Kringos, Nicole KTH Royal Inst Technol Stockholm Sweden

ISBN: (纸本)9781315736754;9781138026933

With recent advancement in the use of X-Ray Computed Tomography to capture the internal structure of Asphalt Concrete (AC), results have shown several possibilities to account for the distribution of the different phases in the mix and quantify them in a reliable way. The morphology of asphalt mixtures which includes the aggregate size gradation and the distribution of the air-voids and bitumen phase are captured in a single morphological parameter called the Primary Structure (PS) coating thickness-(T-ps). In this study, the effect of variations in the morphological micro-structural property on the mesoscale response of three (3) AC samples is examined using the 3d Finite Element Method (FEM). The AC internal geometry is acquired using X-Ray Computed Tomography (CT);the distribution of the aggregates, mastic and air-voids phase is considered and obtained using digital imaging Processing (dIP) techniques. Using a surface-based cohesive behavior and assuming a predominant adhesive failure at the interface between the mastic and aggregate, a maximum traction criterion is used to obtain the damage propensity of the different mixtures. The result of the analysis shows that the microstructural morphological parameter T-ps adequately captures the meso-scale response of the mixtures;there exist an inverse relationship between mixture strength characterization and the morphological parameter T-ps.

关键词： X-Ray Computed Tomography asphalt concrete morphology digital Image Processing damage micromechanical modeling

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modeling observer variability andmetamerism failure in electronic color displays 22

Modeling observer variability andmetamerism failure in elect...

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22nd Color and imaging conference: Color Science and Engineering Systems, Technologies, and Applications, CIC 2014, Collocated with the 2nd Congress of the international Academy of digital Pathology, IAdP 2014

作者： Long, david L. Fairchild, Mark d. Program of Color Science Rochester Institute of Technology 70 Lomb Memorial Drive RochesterNY14623 United States

ISBN: (纸本)9780892083138

The electronic display industry has begun a migration towards higher color gamut devices driven by LEd, OLEd, quantum dot and laser technologies capable of generating near monochromatic color stimuli in the traditional red, green, blue three-channel paradigm. The use of highly selective spectral stimuli, however, poses a risk to the consistency of visual experience amongst a group of disparate, but otherwise normal, color observers. Several models of spectral color vision have surfaced in recent research and are helping investigators to better understand the implications for color experience variability. The present research serves to summarize various color difference indices that may be useful in predicting the magnitude of observer response inconsistencies and applies them to simulations of current electronic displays as examples of potential concerns these new high-gamut technologies might raise. In particular, various laser-based displays are shown to perform with significantly increased observer variability versus traditional ITU-R Rec. 709 and SMPTE 431 RGB-primary displays utilized in the cinema industry. Further, observer metamerism can be reduced significantly with proper optimization of a multichannel projection system comprising seven explicitly designed primary spectra. © 2014 Society for imaging Science and Technology.

关键词： Color

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A reduced complexity approach for image compression using 1-d & 2-d chaos functions

A reduced complexity approach for image compression using 1-...

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recent advances and Innovations in Engineering (ICRAIE)

作者： Madhu Sharma Swati Jain CSE S. S Jain Subodh P.G. (Autonomous) College Associate Professor Jaipur India CSE BIIET Assistant Professor Jaipur India

To match the pace of continuous development and ever expanding internet world, the security and compression issues relevant to the data handling and communication are becoming prominent. The demand of these factors is increasing with the requirement of ease of communication of digital multimedia. Thus the encryption of data plays a vital role in such communication. It can be seen that the major requirements in case of transaction of bulky image information is the encryption of digital image data followed by its compression using an efficient mechanism. The image encryption is not as smooth as text encryption, but somewhat more difficult due to its large size, high correlation among pixels and redundancy. Such factors increase the computation time for image encryption and compression. Thus there is great demand of mechanisms which can perform this activity in reduced computation time [1-5]. In this paper, we have introduced an improvement in computation time of existing image encryption-decryption methods through the usage of chaos functions based logistic map along with discrete Wavelet Transform method.

关键词： discrete wavelet transforms Nonlinear optics Chaotic communication Artificial intelligence Encryption Optical imaging

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BioImage Informatics: The challenge of knowledge extraction from biological images

BioImage Informatics: The challenge of knowledge extraction ...

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international conference on digital Technologies (dT)

作者： Paolo Soda Computer Science and Bioinformatics Laboratory University Campus Bio-Medico of Rome Roma Italy

Bioimage Informatics is a rapidly growing research field that is giving fundamental contributions to research in biology and biomedicine aiming at facilitating the extraction of quantitative information from images. Great advances in biological tissue labeling and microscopic imaging are radically changing how biologists visualize and study the molecular and cellular structures. These devices nowadays produce terabyte-sized multi-dimensional images: how to automatically and efficiently extract objective knowledge from such images has become a major challenge. In this manuscript we analyze the state-of-the-art of Bioimage Informatics, with a special focus on neuroscience. We show that there are increasing efforts to deliver methods and software tools providing functionalities for visualization, representation, management and analysis of 3d multichannel images. Nevertheless, most of them have been applied on datasets with size of MVoxel or few GVoxel, where the variations in contrast, illumination, as well as object shape and dimensions are limited. The huge dimensions of new 3d image stacks therefore ask for fully automated processing methods, whose parameters should be dynamically adapted to different regions in the volume. In this respect, this manuscript deepens in a recent contribution that digitally charts the Purkinje cells of whole mouse cerebellum, corresponding to an image dataset of 120 GVoxels.

关键词： Informatics Microscopy Biology Biomedical imaging Open source software data mining

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