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Excimer laser processing of ferrite video heads

APPLIED SURFACE SCIENCE 1996年 106卷 374-378页

作者： Liedl, G Schroder, K Kaplan, A TECH UNIV VIENNA FORSCHUNGSINST HOCHLEISTUNGSSTRAHLTECHA-1030 VIENNAAUSTRIA

The technology of pulsed excimer laser ablation for processing ferrite video heads at 248 nm KrF laser radiation was studied, Using the mask imaging technique two trapezoids were projected onto the surface of the samples producing laser-etched grooves with a depth of approximately 45 mu m. A sufficiently sharp contour of the trapezoids was achieved at the workpiece. Since the variations of the critical dimensions with respect to depth were outside the tolerance range the sample was slightly tilted to compensate for the beam divergence and to obtain parallel edges of the trapezoidal grooves with all error of less than 5 mu m over the whole depth of the cavities. Micrographs of the samples showed that the surfaces of the laser-etched video heads were covered with ablated material and small droplets of resolidified material. These sediments fan be removed easily by a slight polishing of the surface. For the experiments ii typical fluence of 5 J/cm(2) was used which allowed etch rates of 50 nm per pulse. The work showed that excimer lasers are useful tools for the precise micromachining of ferrite video heads.

关键词： Pulsed laser applications

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Test Oracles Based on Metamorphic Relations for Image processing applications 16

Test Oracles Based on Metamorphic Relations for Image Proces...

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16th IEEE/ACIS International conference on Software Engineering, Artificial Intelligence, Networking and parallel/Distributed Computing (SNPD)

作者： Jameel, Tahir Lin, Mengxiang Chao, Liu Beihang Univ State Key Lab Software Dev Environm Beijing Peoples R China Beihang Univ Inst Software Engn Beijing Peoples R China

ISBN: (纸本)9781479986767

Testing of image processing applications is a challenging job especially, when evaluating the correctness of output image. Generally, output images are evaluated manually by visual inspection carried out by an expert tester, which is the main hindrance in automation of testing process. Recently, statistical and metamorphic testing approaches are presented to automate output evaluation of image processing applications. The statistical method is dependent on availability of statistical distribution of output images, whereas metamorphic testing require more research efforts to make it widely used in practice. Metamorphic testing is a well-known technique to alleviate the test oracle problem and eliminates the required manual efforts by using relations of input and output images. Follow-up test cases are generated based on these relations and their expected output is evaluated. This paper addresses test oracle problem for image processing applications and demonstrates how properties of implementation under test can be adopted as metamorphic relations. We have studied general and specific metamorphic relations of morphological image operations such as dilation and erosion. Selection of metamorphic relations and their effectiveness by mutation analysis is demonstrated. The results show that metamorphic testing is useful for evaluation of output images in the absence of a perfect test oracle.

关键词： Testing imaging applications Metamorphic Testing Test Oracle

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Computer Simulation of Magnetic Resonance Angiography imaging. parallel Implementation in Heterogeneous Computing Environment

Computer Simulation of Magnetic Resonance Angiography Imagin...

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Joint conference on New Trends in Audio and Video And Signal processing - Algorithms, Architectures, Arrangements and applications (NTAV/SPA)

作者： Klepaczko, Artur Szczypinski, Piotr Dwojakowski, Grzegorz Kocinski, Marek Strzelecki, Michal Lodz Univ Technol Inst Elect Ul Wolczanska 211-215 PL-90924 Lodz Poland

ISBN: (纸本)9788372835024

Magnetic resonance imaging (MRI) is currently widely used in medical image diagnosis. However, MR scanners are extensively used in clinics and thus are rarely accessible for experimentation. In consequence, the number of images available for image processing methods evaluation is too low and there appears a need for a method to generate synthetic images. In their previous works, the authors studied various methods for blood vessels segmentation and tracking. Effectiveness of the designed algorithms requires objective verification which implies repetition of experiments for large number of images and comparing the results with some ground truth models. Therefore, this study aims at designing a computer system which implements numerical routines for generation of synthetic MRA images. In particular, in this paper we study the performance of various configurations of assembled computer grid and analyze their potential in angiographic image synthesis.

关键词： Magnetic Resonance Angiography Computer Simulation images image diagnosis Image synthesis Computer systems experimentation computational grids ground truth Blood Vessels Repetition network computing environments distributed computing environment image processing method Magnetic Resonance imaging

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A novel parallel algorithm for airport runway segmentation in satellite images using priority directional region growing strategy based on ensemble learning

A novel parallel algorithm for airport runway segmentation i...

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conference on parallel processing for imaging applications

作者： Duan, Fei Zhang, Yu-Jin Tsinghua Univ Dept Elect Engn Beijing 100084 Peoples R China

ISBN: (纸本)9780819484093

This paper addresses the problem of airport runway segmentation in satellite images with complex background clutter. To this ends, we propose a novel ensemble learning based parallel runway segmentation algorithm. The contributions of our work can be summarized as follows: (a) we propose the concept of Priority Directional Region Growing. (b) We introduce the Bresenham's line generating algorithm into our segmentation task to better utilize the structural a priori. (c) we adopt a two-stage strategy to better segment the regions corresponding to the airport runway by applying the traditional region growing method and our priority directional (two orthogonal directions in our problem) region growing method sequentially. (d) In our runway segmentation algorithm, the ensemble-learning strategy is used to combine the growing results of each detected line segment. In addition, those thin side branches, which have significantly different width, are eliminated. To evaluate the effectiveness of our algorithm, extensive simulations are carried out on the testing images obtained from Google Map. Our experimental results show that the proposed algorithm can effectively and efficiently segmented the airport region, generate relatively neat boundaries of the runways, and have great superiority over the state-of-the-art methods.

关键词： region growing directional priority region growing Bresenham's line Hough transformation

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Efficient algorithm for the temporal and spatial based calculation of speckle contrast

Efficient algorithm for the temporal and spatial based calcu...

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conference on Novel Biophotonic Techniques and applications II (NBTA)

作者： Steimers, A. Farnung, W. Kohl-Bareis, M. Univ Appl Sci Koblenz D-53424 Remagen Germany

ISBN: (纸本)9780819496508

We demonstrate an efficient algorithm for the temporal and spatial based calculation of the laser speckle contrast analysis (LASCA) for the imaging of blood flow that reduces the numerical complexity of necessary calculations, facilitates a multi-core implementation of the speckle analysis and enables an independence of temporal or spatial resolution and SNR. The new algorithm was evaluated for both spatial and temporal based analysis of speckle patterns with different image sizes and incorporated pixels as sequential and multi-core code. The improvement is about a factor of 5 and can be increased to about a factor of 15 for multi-core computers. This allows an online-analysis of larger speckle images or at a higher frame rate.

关键词： Speckle imaging speckle spectroscopy parallel processing digital image processing high-resolution spectroscopy multi-frame image processing laser speckle contrast analysis blood flow perfusion imaging

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parallel Reconstruction of Quad Only Meshes from Volume Data 15

Parallel Reconstruction of Quad Only Meshes from Volume Data

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15th International Joint conference on Computer Vision, imaging and Computer Graphics Theory and applications (VISIGRAPP) / 15th International conference on Computer Vision Theory and applications (VISAPP)

作者： Grosso, Roberto Zint, Daniel Friedrich Alexander Univ Erlangen Nurnberg FAU Visual Comp Erlangen Germany

ISBN: (纸本)9789897584022

We present a method to reconstruct quad only meshes from volume data which mainly consists of two steps: reconstruction of a quad only mesh and topological simplification to reduce the number of irregular vertices. A novel algorithm is described that computes Dual Marching Cubes (DMC) meshes without using lookup tables. The meshes are topologically consistent across cell borders, i.e. they are watertight. The output of the algorithm is a quad only mesh stored in a halfedge data structure. Due to the transitions between voxel layers in volume data, meshes have numerous quad elements with vertices of valence 3 - X - 3 - Y, where X, Y >= 5, and 3 - 3 - 3 - 3. Hence, we simplify the mesh by eliminating these elements wherever possible. Finally, we briefly describe a CUDA implementation of the algorithms, which allows processing huge amounts of data on GPU at almost interactive time rates.

关键词： Dual Marching Cubes Quad Meshing parallel Mesh Reconstruction

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Novel applications through Miniaturization and Scalability of Spectral Sensing and imaging (Invited Paper) 23

Novel Applications through Miniaturization and Scalability o...

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International conference on Optical MEMS and Nanophotonics (OMN)

作者： Rissanen, Anna VTT Tech Res Ctr Finland Espoo Finland

ISBN: (纸本)9781509063741

VTT's Fabry-Perot interferometer (FPI) tunable optical filter technology makes it possible to create small and cost-efficient microspectrometers and hyperspectral imagers for wavelengths from UV to thermal infrared. The technology is capable of addressing two parallel application drivers: 1) high performance, generated by large optical apertures and excellent customization capability for enabling novel demanding sensing applications, and 2) high-volume manufacturing scalability of MEMS FPI processing to generating potential to reach a disruptive price point enabling completely new spectral sensor markets. Through continuous engagement with industry, these small sensors are finding their way into new applications and sensor products, including for example small satellite instruments, medical diagnostics, hand-held and mobile sensing devices and industrial process measurements.

关键词： Hyperspectral imaging Microspectrometer Fabry-Perot Interferometer Mobile Spectroscopy Small Satellites

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Cost-effective medical image reconstruction: From clusters to Graphics processing Units 08

Cost-effective medical image reconstruction: From clusters t...

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2008 conference on Computing Frontiers, CF'08

作者： Sehellmann, Maraike Vörding, Jürgen Gorlatch, Sergei Meiländer, Dominik University of Münster Germany

ISBN: (纸本)9781605580777

We demonstrate that for modern medical imaging applications, parallel implementations on traditional parallel architectures (clusters and multiprocessor servers) can be outperformed, both in terms of speed and cost-effectiveness, by new implementations on next-generation architectures like GPUs (Graphics processing Units). Although, compared to clusters and multiprocessor servers, GPUs are rather small and much less expensive, they consist of several SIMD-processors and thus provide a high degree of parallelism. For an iterative image reconstruction algorithm-the list-mode OSEM- we demonstrate, first, the limitations of parallel reconstructions with this algorithm on the traditional parallel architectures, and second, how the well-analyzed parallel strategies for traditional architectures can be adapted systematically to achieve fast reconstructions on the GPU. Copyright 2008 ACM.

关键词： Graphics processing unit

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Large detector array and real-time processing and elemental image projection of X-ray and proton microprobe fluorescence data

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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 2007年第1期260卷 1-7页

作者： Ryan, C. G. Siddons, D. P. Moorhead, G. Kirkham, R. Dunn, P. A. Dragone, A. De Geronimo, G. Monash Univ CSIRO Explorat & Mining Geosci Clayton Vic 3168 Australia Univ Melbourne Dept Phys Melbourne Vic 3010 Australia Brookhaven Natl Lab Upton NY 11973 USA Brookhaven Natl Lab Instrumentat Div Upton NY 11973 USA CSIRO Mfg & Mat Technol Clayton Vic 3168 Australia Univ Tasmania CODES Ctr Excellence Hobart Tas 7001 Australia

A detector concept is described that integrates a large solid-angle detector array developed at Brookhaven National Laboratory and a high speed pipelined parallel processing engine developed at CSIRO for machine vision, with an embedded implementation of the Dynamic Analysis method for fluorescence spectra deconvolution and image projection, to yield a detection system capable of energy-dispersive detection, spectral deconvolution and real-time elemental imaging at similar to 10(8) events per second for PIXE elemental imaging using the nuclear microprobe and SXRF elemental imaging using the synchrotron X-ray microprobe. (c) 2007 Elsevier B.V. All rights reserved.

关键词： detector real-time processing PIXE SXRF nuclear microprobe X-ray microprobe

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Research on Computer Neural Network processing Chip in Data Heterogeneous processing System 5

Research on Computer Neural Network Processing Chip in Data ...

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2023 5th International conference on Artificial Intelligence and Computer applications, ICAICA 2023

作者： Binming, Xie Lei, Zheng Nari Group Corporation Information System Integration Company Nanjing China

ISBN: (纸本)9798350323313

Nonlinear frequency modulation scaling algorithm can effectively solve the problem of strongly coupled echo, but sequential NFM signal scaling method is difficult to meet the real-time imaging requirements. In this project, the nonlinear frequency modulation scaling method based on subaperture is used to improve the computational efficiency of the algorithm. The real-time nonlinear frequency modulation scale-up imaging algorithm is implemented in parallel on a heterogeneous multi-core prototype chip. Compared with the traditional serial method, this method has higher parallel speed and operation speed. Compared with the traditional single subaperture method, the real-time efficiency of this method is as high as 90.06%. © 2023 IEEE.

关键词： Computational efficiency

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