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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Chowdhury, Sarah N. Simon, Jeffrey Nowak, Michal P. Prokopeva, Ludmila J. Pagadala, Karthik Fruhling, Colton Nyga, Piotr Bravo, Esteban Garcia Kildishev, Alexander V. Shalaev, Vladimir M. School of Electrical and Computer Engineering Birck Nanotechnology Center Purdue University 1205 W State St West LafayetteIN47906 United States Institute of Optoelectronics Military University of Technology 2 Kaliskiego St Warsaw00-908 Poland Institute of Physics Faculty of Physics Astronomy and Informatics Nicolaus Copernicus University Toruń87-100 Poland Department of Computer Graphics Technology Purdue University 401 N. Grant St Knoy Hall West LafayetteIN47907 United States

We demonstrate a wide gamut of color generation by large-scale, lithography-free, and environment-friendly plasmonic structures with a resolution of 100 urn for macroscopic color printing by utilizing femtosecond lase... 详细信息

ISBN: (纸本)9781957171258

关键词： Color

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computer-aided implant design for the restoration of cranial defects

arXiv

引用

arXiv 2017年

作者： Chen, Xiaojun Xu, Lu Li, Xing Egger, Jan Institute of Biomedical Manufacturing and Life Quality Engineering State Key Laboratory of Mechanical System and Vibration School of Mechanical Engineering Shanghai Jiao Tong University Shanghai China Faculty of Computer Science and Biomedical Engineering Institute for Computer Graphics and Vision Graz University of Technology Graz Austria BioTechMed-Graz Graz Austria

Patient-specific cranial implants are important and necessary in the surgery of cranial defect restoration. However, traditional methods of manual design of cranial implants are complicated and time-consuming. Our purpose is to develop a novel software named EasyCrania to design the cranial implants conveniently and efficiently. The process can be divided into five steps, which are mirroring model, clipping surface, surface fitting, the generation of the initial implant and the generation of the final implant. The main concept of our method is to use the geometry information of the mirrored model as the base to generate the final implant. The comparative studies demonstrated that the EasyCrania can improve the efficiency of cranial implant design significantly. And, the intra- and inter-rater reliability of the software were stable, which were 87.07 ± 1.6% and 87.73 ± 1.4% respectively. Copyright © 2017, The Authors. All rights reserved.

关键词： Restoration

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Speckle reduction with trained nonlinear diffusion filtering

arXiv

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arXiv 2017年

作者： Feng, Wensen Chen, Yunjin School of Automation and Electrical Engineering University of Science and Technology Beijing Beijing100083 China Institute for Computer Graphics and Vision Graz University of Technology Inffeldgasse 16 GrazA-8010 Austria

Speckle reduction is a prerequisite for many image processing tasks in synthetic aperture radar (SAR) images, as well as all coherent images. In recent years, predominant state-of-the-art approaches for despeckling are usually based on nonlocal methods which mainly concentrate on achieving utmost image restoration quality, with relatively low computational efficiency. Therefore, in this study we aim to propose an efficient despeckling model with both high computational efficiency and high recovery quality. To this end, we exploit a newly-developed trainable nonlinear reaction diffusion(TNRD) framework which has proven a simple and effective model for various image restoration problems. In the original TNRD applications, the diffusion network is usually derived based on the direct gradient descent scheme. However, this approach will encounter some problem for the task of multiplicative noise reduction exploited in this study. To solve this problem, we employed a new architecture derived from the proximal gradient descent method. Taking into account the speckle noise statistics, the diffusion process for the despeckling task is derived. We then retrain all the model parameters in the presence of speckle noise. Finally, optimized nonlinear diffusion filtering models are obtained, which are specialized for despeckling with various noise levels. Experimental results substantiate that the trained filtering models provide comparable or even better results than state-of-the-art nonlocal approaches. Meanwhile, our proposed model merely contains convolution of linear filters with an image, which offers high level parallelism on GPUs. As a consequence, for images of size 512 × 512, our GPU implementation takes less than 0.1 seconds to produce state-of-the-art despeckling performance. Copyright © 2017, The Authors. All rights reserved.

关键词： Computational efficiency

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Privacy Evaluation Protocols for the Evaluation of Soft-Biometric Privacy-Enhancing Technologies

Privacy Evaluation Protocols for the Evaluation of Soft-Biom...

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International Conference of the Biometrics Special Interest Group (BIOSIG)

作者： Philipp Terhörst Marco Huber Naser Damer Peter Rot Florian Kirchbuchner Vitomir Struc Arjan Kuijper Fraunhofer Institute for Computer Graphics Research IGD Darmstadt Germany Mathematical and Applied Visual Computing TU Darmstadt Darmstadt Germany Faculty of Electrical Engineering University of Ljubljana Ljubljana Slovenia

ISBN: (数字)9783885797005

ISBN: (纸本)9781728189277

Biometric data includes privacy-sensitive information, such as soft-biometrics. Soft-biometric privacy enhancing technologies aim at limiting the possibility of deducing such information. Previous works proposed several solutions to this problem using several different evaluation processes, metrics, and attack scenarios. The absence of a standardized evaluation protocol makes a meaningful comparison of these solutions difficult. In this work, we propose privacy evaluation protocols (PEPs) for privacy-enhancing technologies (PETs) dealing with soft-biometric privacy. Our framework evaluates PETs in the most critical scenario of an attacker that knows and adapts to the systems privacy-mechanism. Moreover, our PEPs differentiate between PET of learning-based or training-free nature. To ensure that our protocol meets the highest standards in both cases, it is based on Kerckhoffs`s principle of cryptography.

关键词： Protocols Faces Privacy Training Creep Data privacy Face recognition

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Minimal Cases for Computing the Generalized Relative Pose using Affine Correspondences

Minimal Cases for Computing the Generalized Relative Pose us...

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International Conference on computer Vision (ICCV)

作者： Banglei Guan Ji Zhao Daniel Barath Friedrich Fraundorfer College of Aerospace Science and Engineering National University of Defense Technology China Computer Vision and Geometry Group ETH Zürich Institute for Computer Graphics and Vision Graz University of Technology Austria Remote Sensing Technology Institute German Aerospace Center Germany

ISBN: (纸本)9781665428132

We propose three novel solvers for estimating the relative pose of a multi-camera system from affine correspondences (ACs). A new constraint is derived interpreting the relationship of ACs and the generalized camera model. Using the constraint, we demonstrate efficient solvers for two types of motions assumed. Considering that the cameras undergo planar motion, we propose a minimal solution using a single AC and a solver with two ACs to overcome the degenerate case. Also, we propose a minimal solution using two ACs with known vertical direction, e.g., from an IMU. Since the proposed methods require significantly fewer correspondences than state-of-the-art algorithms, they can be efficiently used within RANSAC for outlier removal and initial motion estimation. The solvers are tested both on synthetic data and on real-world scenes from the KITTI odometry benchmark. It is shown that the accuracy of the estimated poses is superior to the state-of-the-art techniques.

关键词： computer vision Motion estimation Computational modeling Pose estimation Benchmark testing Cameras Image sequences

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In-depth assessment of an interactive graph-based approach for the segmentation for pancreatic metastasis in ultrasound acquisitions of the liver with two specialists in Internal Medicine 10

In-depth assessment of an interactive graph-based approach f...

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10th Biomedical engineering International Conference, BMEiCON 2017

作者： Schmalstieg, Dieter Bettac, Lucas Hanle, Mark Hann, Alexander Chen, Xiaojun Grater, Tilmann Egger, Jan Zoller, Wolfram G. Institute for Computer Graphics and Vision Graz University of Technology Graz Austria Department of Internal Medicine i Ulm University Ulm Germany School of Mechanical Engineering Shanghai Jiao Tong University Shanghai China Department of Diagnostic and Interventional Radiology Ulm University Ulm Germany BioTechMed-Graz Graz Austria Department of Internal Medicine and Gastroenterology Katharinenhospital Stuttgart Germany

ISBN: (纸本)9781538608821

The manual outlining of hepatic metastasis in (US) ultrasound acquisitions from patients suffering from pancreatic cancer is common practice. However, such pure manual measurements are often very time consuming, and the results repeatedly differ between the raters. In this contribution, we study the in-depth assessment of an interactive graph-based approach for the segmentation for pancreatic metastasis in US images of the liver with two specialists in Internal Medicine. Thereby, evaluating the approach with over one hundred different acquisitions of metastases. The two physicians or the algorithm had never assessed the acquisitions before the evaluation. In summary, the physicians first performed a pure manual outlining followed by an algorithmic segmentation over one month later. As a result, the experts satisfied in up to ninety percent of algorithmic segmentation results. Furthermore, the algorithmic segmentation was much faster than manual outlining and achieved a median Dice Similarity Coefficient (DSC) of over eighty percent. Ultimately, the algorithm enables a fast and accurate segmentation of liver metastasis in clinical US images, which can support the manual outlining in daily practice. © 2017 IEEE.

关键词： Ultrasonics

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Design of an optimal test pattern generator for built-in self testing of path delay faults

Design of an optimal test pattern generator for built-in sel...

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International Conference on VLSI Design

作者： D.K. Das I. Chaudhuri B.B. Bhattacharya Department of Computer Science & Engineering. Jadavpur University Calcutta India Mentor Graphics Corporation Hyderabad India Advanced Computing & Microelectronics Unit Indian Statistical Institute Calcutta India

A novel design of a test pattern generator (TPG) for built-in self-testing (BIST) of path delay faults, is proposed. For an n-input CUT, the TPG generates a sequence of length (n.2/sup n/+1), that includes all n.2/sup n/ single-input-change (SIC) test pairs, and hence optimal. The generation of such a sequence of minimum length (i.e., n.2/sup n/+1) was an open problem. A simple iterative circuit of the TPG is then constructed. This provides minimum test application time for testing path delay faults, and compares favorably with the earlier BIST designs.

关键词： Test pattern generators Automatic testing Delay Circuit testing Silicon carbide Circuit faults Built-in self-test Electrical fault detection Fault detection Robustness

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Low power NoC switch using novel adaptive virtual channels

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International Journal of computer Science Issues 2011年第5 5-3期8卷 303-308页

作者： Ezz-Eldin, Rabab El-Moursy, Magdy Refaat, Amr Electrical and Computer Engineering Department Bani-suef University Bani-suef Egypt Electronics Research Institute Cairo Egypt Mentor Graphics Corporation Cairo Egypt Electrical Engineering Department Fayoum University Fayoum Egypt

Adaptive Virtual Channel (AVC) is proposed as a novel technique to achieve low powerNoC switch. Power supply gating is employed to reduce the power dissipation of NoC switchwithout degrading network performance. Hierarchical multiplexing tree is used to achieve efficient AVC. AVC could reduce both dynamic and leakage power of the switch. Hierarchical multiplexing tree decreases the area of the switch which reduces the dynamic power by 60%. Using the leakage power reduction technique, the average leakage power consumption of Adaptive Virtual Channels is reduced by up to 97%.

关键词： Network-on-chip

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Method for automatically segmenting the spinal cord and canal from 3D CT images

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11th International Conference on computer Analysis of Images and Patterns, CAIP 2005

作者： Nyúl, Lászlo G. Kanyó, Judit Máté, Eörs Makay, Géza Balogh, Emese Fidrich, Márta Kuba, Attila Department of Image Processing and Computer Graphics University of Szeged Árpád tér 2 H-6720 Szeged Hungary Clinical Software Engineering GE Medical Systems Lajos u. 48-66 H-1036 Budapest Hungary Institute of Mathematics University of Szeged Aradi vértanuk tere 1 H-6720 Szeged Hungary

ISBN: (纸本)3540289690

We present two approaches for automatically segmenting the spinal cord/canal from native CT images of the thorax region containing the spine. Different strategies are included to handle images where only part of the spinal column is visible. The algorithms require one seed point given on a slice located in the middle region of the spine, and the rest is automatic. The spatial extent of the spinal cord/canal is determined automatically. An extended region-growing technique is suggested for segmenting the spinal canal while active contours are applied if the spinal cord is to be segmented. Both methods work in 2D and use propagated information from neighboring slices. They are also very rapid in execution, that means an efficient, user-friendly workflow. The methods were evaluated by radiologists and were found to be useful (in reducing/eliminating contouring labor and time) and met the accuracy and repeatability requirements for the particular task. © Springer-Verlag Berlin Heidelberg 2005.

关键词： computerized tomography

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Micromorphology of AlN Epilayers on Sapphire Substrates

Micromorphology of AlN Epilayers on Sapphire Substrates

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2017 International Conference on computer, Electronics and Communication engineering(CECE2017)

作者： ?tefan ??LU Dinara SOBOLA Pavel TOMáNEK Sebastian STACH Technical University of Cluj-Napoca Faculty of Mechanical Engineering Department of AETDiscipline of Descriptive Geometry and Engineering Graphics Brno University of Technology Faculty of Electrical Engineering and Communication Physics Department University of Silesia Faculty of Computer Science and Materials Science Institute of InformaticsDepartment of Biomedical Computer Systems

The purpose of this paper was to describe the 3 D nano-scaled surface topography of the aluminum nitride on sapphire. The structures were prepared by magnetron sputtering with heating of the sapphire substrate. The dependence of the layers topography on the substrate temperature was presented. Surface appearance was studied by atomic force microscopy(AFM). The quantitative topography data from AFM were used for surface characterization by fractal analysis and statistical parameters. The results of fractal analysis show the correlation of fractal dimension and statistical characteristics of surface topography. The data may contribute to manufacture of AlN thin films with desired surface characteristics.

关键词： Aluminum nitride Atomic force microscopy Fractal analysis Minkowsky functionals Surface micromorphology

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