检索结果-内蒙古大学图书馆

brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： L.A. Pereira Neves J. Facon Pontificia Universidade Catolica do Parana Curitiba Parana Brazil

the article presents a method for the automatic extraction of the contents of passive and/or active cells in forms. the approach is based on the analysis and recognition of the types of intersection of the lines that make up such cells. Very little a priori knowledge of the form is required. the performance of this approach depends on the correction module mechanisms for detection and correction of errors generated during the intersection identification phase. the potentialities and advantages of this approach are described and illustrated with tests carried out on different form bases.

关键词： Error correction image segmentation Phase detection Automatic testing System testing Data mining Handwriting recognition image analysis image databases Binary trees

来源：评论

学校读者我要写书评

暂无评论

Reconstruction by using a wavelet representation of the algebraic Radon transform

Reconstruction by using a wavelet representation of the alge...

引用

brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： J.G.F. Mexas A. De Oliveira C. Esperanca Dept. de Matematica Aplicada UFF Niteroi Brazil Laboratório de Computação Grafica COPPE-Programa de Engenharia de Sistemas e Computação Rio de Janeiro Brazil Laboratorio de Computacao Grafica COPPE-Programa de Engenharia de Sistemas e Computacao Rio de Janeiro Brazil

We use a wavelet representation of the algebraic Radon transform for reconstructing an image from its sinogram at a controlled level of resolution.

关键词： Wavelet transforms image resolution image reconstruction Discrete wavelet transforms Continuous wavelet transforms Imaging phantoms Head Signal resolution Low pass filters Tail

来源：评论

学校读者我要写书评

暂无评论

Rectangle detection based on a windowed Hough transform

Rectangle detection based on a windowed Hough transform

引用

brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： C.R. Jung R. Schramm UNISINOS Universidade do Vale do Rio dos Sinos Sao Leopoldo Rio Grande do Sul Brazil

the problem of detecting rectangular structures in images arises in many applications, from building extraction in aerial images to particle detection in cryo-electron microscopy. this paper proposes a new technique for rectangle detection using a windowed Hough transform. Every pixel of the image is scanned, and a sliding window is used to compute the Hough transform of small regions of the image. Peaks of the Hough image (which correspond to line segments) are then extracted, and a rectangle is detected when four extracted peaks satisfy certain geometric conditions. Experimental results indicate that the proposed technique produced promising results for both synthetic and natural images.

关键词： image segmentation image edge detection Buildings Microscopy Pixel Windows Shape Vehicle detection Vehicles image recognition

来源：评论

学校读者我要写书评

暂无评论

Multiscale image segmentation using wavelets and watersheds

Multiscale image segmentation using wavelets and watersheds

引用

brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： C.R. Jung Centro de Ciencias Exatas e Tecnológicas UNISINOS Universidade do Vale do Rio dos Sinos Rio Grande do Sul Brazil

We propose a new multiscale segmentation technique based on wavelet decompositions and watersheds. the wavelet transform is applied to the image, producing detail and approximation coefficients. the watershed is applied to the approximation image at a certain resolution 2/sup J/, and projected up to higher resolutions using the inverse wavelet transform. At lower resolutions, the segmentation captures large relevant objects, while at higher resolution more details are obtained. Since downsizing is inherent to the wavelet transform, watershed segmentation is applied to a smaller image, demanding less computational time. the proposed technique appears to be robust for noisy images, even when the amount of noise is very large.

关键词： image segmentation image resolution Wavelet transforms Frequency image edge detection Shape measurement Filters Energy resolution Position measurement Size measurement

来源：评论

学校读者我要写书评

暂无评论

A non-self-intersection Douglas-Peucker algorithm

A non-self-intersection Douglas-Peucker algorithm

引用

brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： S.-T. Wu M.R.G. Marquez Department of Industrial Automation and Computer Engineering (DCA) State University of Campinas (Unicamp) Campinas SP Brazil

the classical Douglas-Peucker line-simplification algorithm is recognized as the one that delivers the best perceptual representations of the original lines. It is used extensively for both computer graphics and geographic information systems. there are two variants of this algorithm, the original O(nm) method, where n denotes the number of input vertices and m the number of output segments, that works in any dimension, and the O(nlogn) one, which only works for simple 2D planar polylines. In the both variants, a self-intersecting simplified line may be yielded if the accepted approximation is not sufficiently fine. Based on star-shaped subsets, we present yet another O(mn) variant of Douglas-Peucker algorithm which preserves the nonself-intersection property for any predefined tolerance.

关键词： Data visualization computer industry Automation computer graphics Geographic Information Systems Sampling methods Displays Data mining Feature extraction

来源：评论

学校读者我要写书评

暂无评论

Adaptive deformable models

Adaptive deformable models

引用

brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： S. Goldenstein C. Vogler L. Velho UNICAMP Universidade Estadual de Campinas Sao Paulo Brazil Gallaudet Research Institute Gallaudet University Washington D.C. DC USA Estrada Dona Castorina 110 IMPA-Instituto de Matemática Pura e Aplicada Rio de Janeiro Rio de Janeiro Brazil

Deformable models are a powerful tool in both computer graphics and computer vision. the description and implementation of the deformations have to be simultaneously flexible and powerful, otherwise the technique may not satisfy the requirements of all the distinct applications. In this paper we introduce a new method for deformable model specification: deformable fields. Deformable fields are conceptually simple, lead to an easy implementation, and are suitable for adaptive models. We apply our new technique to describe an adaptive deformable face, and compare three different adaptation strategies. Additionally, we show how our technique is suitable to describe different individuals.

关键词： Deformable models Application software computer graphics computer vision Face detection Humans Facial animation Concrete Heart Robots

来源：评论

学校读者我要写书评

暂无评论

Signal processing method of holographic memory using image distortion correction and soft decision Viterbi decoding method

引用

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS 2005年第5B期44卷 3508-3512页

作者： Sato, D Nishimoto, K Katayanagi, Y Yamamoto, M Tokyo Univ Sci Grad Sch Ind Sci & Technol Noda Chiba 2788510 Japan

the signal quality of holographic memory is greatly lowered by the pixel mismatch between the charge-coupled device (CCD) and the reproduced image caused by image distortion. this paper discusses an approach to improve the signal quality by using two step decoding method. By this method, first, distortion correction is done to improve the degree of pixel mismatch to obtain better signal to noise ratio (SNR). then, to eliminate errors such as noise that cannot be removed by distortion correction, soft decision Viterbi decoding using the newly defined reliability is used to correct errors. the effectiveness of this two step decoding method was tested by computer simulation, and its effect to improve SNR and reduce errors was confirmed.

关键词： holographic memory distortion correction Viterbi decoding soft decision reliability modulation code

来源：评论

学校读者我要写书评

暂无评论

Runtime support for adaptive spatial partitioning and inter-kernel communication on GPUs 26

Runtime support for adaptive spatial partitioning and inter-...

引用

26th International symposium on computer Architecture and High Performance Computing, SBAC-PAD 2014

作者： Ukidave, Yash Kalra, Charu Kaeli, David Mistry, Perhaad Schaa, Dana Department of Electrical and Computer Engineering Northeastern University BostonMA United States Advanced Micro Devices United States

ISBN: (纸本)9781479969043

GPUs have gained tremendous popularity in a broad range of application domains. these applications possess varying grains of parallelism and place high demands on compute resources - many times imposing real-time constraints, requiring flexible work schedules, and relying on concurrent execution of multiple kernels on the device. these requirements present a number of challenges when targeting current GPUs. To support this class of applications, and to take full advantage of the large number of compute cores present on the GPU, we need a new mechanism to support concurrent execution and provide flexible mapping of compute kernels to the GPU. In this paper, we describe a new scheduling mechanism for dynamic spatial partitioning of the GPU, which adapts to the current execution state of compute workloads on the device. To enable this functionality, we extend the OpenCL runtime environment to map multiple command queues to a single device, and effectively partitioning the device. the result is that kernels that can benefit from concurrent execution on a partitioned device can effectively utilize the full compute resources on the GPU. To accelerate next-generation workloads, we also support an inter-kernel communication mechanism that enables concurrent kernels to interact in a producer-consumer relationship. the proposed partitioning mechanism is evaluated using real world applications taken from signal and image processing, linear algebra, and data mining domains. For these performance-hungry applications we achieve a 3.1X performance speedup using a combination of the proposed scheduling scheme and inter-kernel communication, versus relying on the conventional GPU runtime. © 2014 IEEE.

关键词： graphics processing unit

来源：评论

学校读者我要写书评

暂无评论

Towards 3D reconstruction of endoscope images using shape from shading

Towards 3D reconstruction of endoscope images using shape fr...

引用

brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： C.H. Quartucci Forster C.L. Tozzi Universidade Estadual de Campinas Campinas SP BR

the 3D reconstruction problem from a single endoscope image of a smooth object is studied in the context of the shape from shading methods and considering a single light source at the camera projection center. Based on a curve expansion shape from shading algorithm, a spherical projection model for the endoscope camera and a dichromatic model for the surface reflectance, an approach to solve practical problems, namely the endoscope image distortion and the removal of the image specular reflection component, is presented. Results obtained from application of this approach to synthetic and real images are presented.

关键词： image reconstruction Endoscopes Shape Cameras Light sources Surface reconstruction Reflectivity Optical reflection Data visualization Lenses

来源：评论

学校读者我要写书评

暂无评论

Estimation of Multiple Orientations and Multiple Motions in Multi-Dimensional Signals

Estimation of Multiple Orientations and Multiple Motions in ...

引用

brazilian symposium on computer graphics and image processing (SIBGRAPI)

作者： Ingo Stuke Erhardt Barth Cicero Mota Institute for Signal Processing Germany Institute for Neuro-and Bioinformatics University of Luebeck Germany Departamento de Matematica Universidade Federal do Amazonas Manaus Brazil

the estimation of multiple orientations in multidimensional signals is a strongly non-linear problem to which a two-step solution is here presented. First, the problem is linearized by introducing the so-called mixed-orientation parameters as a unique, albeit implicit, descriptor of the orientations. Second, the non-linearities are decomposed such as to find the individual orientations. For two-dimensional signals, e.g., images, this decomposition step is solved by simply determining the roots of a polynomial. For multi-dimensional signals, the nD decomposition problem is solved by reducing it to a cascade of 2D decomposition problems. In this way, a full solution for the estimation of any number of orientations in any dimension is achieved for the first time

关键词： Motion estimation Signal processing Multidimensional signal processing Polynomials image processing image analysis image motion analysis Pattern analysis Biomedical signal processing Bioinformatics

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：