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检索条件"任意字段=15th Brazilian Symposium on Computer Graphics and Image Processing"

共 1144 条记录，以下是141-150 订阅

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How to Choose a Binarization Algorithm for a Document image? 37

How to Choose a Binarization Algorithm for a Document Image?

引用

37th SIBGRAPI Conference on graphics, Patterns and images (SIBGRAPI)

作者： Lins, Rafael Dueire Chaves, Gustavo P. Vieira, thaylor Barboza, Ricardo da Silva Univ Fed Rural Pernambuco Recife PE Brazil Univ Fed Pernambuco Recife PE Brazil Univ Estado Amazonas Manaus Amazonas Brazil

this document is a tutorial on how to choose a binarization algorithm for a document image, considering different analysis criterias. this tutorial focuses on some main challenges one can face when dealing with binari... 详细信息

ISBN: (纸本)9798350376043;9798350376036

关键词： component formatting style styling insert

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Effective image retrieval by shape saliences 16

Effective image retrieval by shape saliences

引用

16th brazilian symposium on computer graphics and image processing

作者： Torres, RS Picado, EM Falcao, AX Costa, LR Univ Campinas Inst Comp BR-13084851 Campinas SP Brazil

ISBN: (纸本)0769520324

Content-Based image Retrieval (CBIR) systems have been developed aiming at enabling users to search and retrieve images based on their properties such as shape, color and texture. In this paper we are concerned with shape-based image retrieval. Here, we discuss a recently proposed shape descriptor called contour saliences, defined as the influence areas of its higher curvature points. this paper introduces a robust approach to estimate contour saliences by exploiting the relation between a contour and its skeleton, modifies the original definition to include the location and the value of saliences along the contour and proposes a new metric to compare contour saliences. the paper also evaluates the effectiveness of the proposed descriptor with respect to Fourier Descriptors, Curvature Scale Space and Moment Invariants.

关键词： Cascading style sheets Content based retrieval image color analysis image retrieval image storage Narrowband Robustness Shape measurement Skeleton Space technology

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Procedural models on image synthesis for ocean animation

Procedural models on image synthesis for ocean animation

引用

14th brazilian symposium on computer graphics and image processing

作者： Pozzer, CT Pellegrino, SRM ITA Sao Jose Dos Campos SP Brazil

ISBN: (纸本)0769513301

this paper presents image-synthesis techniques to define, animate and visualize scenes simulating the behavior of the open-sea surface. Wave modeling is obtained by means of the bump mapping technique. Wave texture, defined by noise functions, is applied by means of a solid-space animation technique to generate surface animation. An implementation based on the Phong model is used to determine diffuse and specular reflections. As a result of the synthesis process, a set of frames is obtained, to be used to compose the animation.

关键词： Animation

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An image-based shading pipeline for 2D animation

An image-based shading pipeline for 2D animation

引用

18th brazilian symposium on computer graphics and image processing (SIBGRAPI 2005)

作者： Bezerra, H Feijó, B Velho, L Pontificia Univ Catolica Rio de Janeiro Rio De Janeiro Brazil

ISBN: (纸本)0769523897

Shading for cel animation based on images is a recent research topic in computer-assisted animation. this paper proposes an image-based shading pipeline to give a 3D appearance to a 2D character by inspecting the hand-drawn image directly. the proposed method estimates normal vectors on the character's outline and interpolates them over the remaining image. the method does not limit the animator's creative process and requires minimal user intervention. the resulting shading pipeline can be easily applied to photorealistic and non-photorealistic 2D cel animation. In the proposed method, the animator can easily simulate environment reflections on the surface of 2D reflecting objects. As far as the authors are concerned, the proposed technique is the only one in the literature that is genuinely an image-based method for 2D animation.

关键词： cel animation non-photorealistic rendering image-based shading computer-assisted animation

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Informed embedding for multibit watermarking 16

Informed embedding for multibit watermarking

引用

16th brazilian symposium on computer graphics and image processing

作者： Silva, RA Mayer, J Univ Fed Santa Catarina Digital Signal Proc Res Lab Dept Elect Engn BR-88040900 Florianopolis SC Brazil

ISBN: (纸本)0769520324

In this paper we propose a practical blind detection multibit watermarking system. the proposed system is analogous to code division multiplexing in spread spectrum communications. Performance improvements with respect to existing multibit systems are obtained by means of informed embedding. With informed embedding we exploit perceptual modeling by using a wavelet-based multiplicative mask and exploit the digital content information to improve watermark detection. We implemented the Proposed system for fragile and semi-robust multibit watermarks. the obtained results confirm the good system performance considering watermark properties of fidelity, efficiency, data payload and robustness against valumetric distortion sources.

关键词： Code division multiplexing Data mining Detectors Digital signal processing Laboratories Nonlinear distortion Payloads Robustness Spread spectrum communication Watermarking

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Exploring memory hierarchy with ArchC 15

Exploring memory hierarchy with ArchC

引用

15th symposium on computer Architecture and High Performance Computing

作者： Viana, P Barros, E Rigo, S Azevedo, R Araújo, G Univ Fed Pernambuco Informat Ctr Recife PE Brazil

ISBN: (纸本)0769520464

this paper presents the cache configuration exploration of a programmable system, in order to find the best matching between the architecture and a given application. Here, programmable systems composed by processor and memories may be rapidly simulated making use of ArchC, an Architecture Description Language (ADL) based on SystemC Initially designed to model processor architectures, ArchC was extended to support a more detailed description of the memory subsystem, allowing the design space exploration of the whole programmable system. As an example, it is shown an image processing application, running on a SPARC-V8 processor-based architecture, which had its memory organization adjusted to minimize cache misses.

关键词： Application software Architecture description languages Computational modeling computer architecture Design methodology Digital systems image processing Informatics Process design Software performance

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Segmentation of TEM images using oscillatory neural networks 14

Segmentation of TEM images using oscillatory neural networks

引用

14th brazilian symposium on computer graphics and image processing

作者： Fernandes, D Navaux, POA Fichtner, PFP Pontificia Univ Catolica Rio Grand do Sul Fac Engn PUCRS BR-90619900 Porto Alegre RS Brazil

ISBN: (纸本)0769513301

Oscillatory neural networks are a relatively recent approach for the problem of image segmentation. Inside of this context, the oscillator neuron of Terman-Wang is presented, which one is used as base element of an oscillatory network called LEGION (Locally Excitatory Globally Inhibitory Oscillator Network). the continuous version of the LEGION network, based on a set of differential equations, presents high computational complexity and has limited capacity of segmentation, what restricts its practical application, being adequate for implementation in parallel hardware topologies, To reduce the computational complexity in serial computers, an algorithm proposed by Terman and Wang is presented, which implies significant gain of speed in comparison to the continuous version and, in contrast, capacity to discriminate a unlimited number of segments. An interactive version of this algorithm was proposed and the results obtained in segmentation of transmission electron microscopy (TEM) images were evaluated, with the objective of measuring helium bubbles in silicon samples. As final result we found that the LEGION network presents itself as a singular alternative to solve problems of image segmentation, which provides simultaneously both spatial and temporal discrimination of segments.

关键词： image segmentation

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A Single Camera image Based Approach for Glossy Reflections in Mixed Reality Applications 15

A Single Camera Image Based Approach for Glossy Reflections ...

引用

15th IEEE International symposium on Mixed and Augmented Reality (ISMAR)

作者： Schwandt, Tobias BroIl, Wolfgang Ilmenau Univ Technol Ilmenau Germany

ISBN: (纸本)9781509036417

Proper scene inference provides the basis for a seamless integration of virtual objects into the real environment. While widely neglected in many AR/MR environments, previous approaches providing good results were based on rather complex setups, often involving mirrored balls, several HDR cameras, and fish eye lenses to achieve proper light probes. In this paper we present an approach requiring a single RGB-D camera image only for generating glossy reflections on virtual objects. Our approach is based on a partial 3D reconstruction of the real environment combined with a screen-space ray-tracing mechanism. We show that our approach allows for convincing reflections of the real environment as well as mutual reflections between virtual objects of an MR environment.

关键词： I.3.7 [Computing Methodologies]: computer graphics three-Dimensional graphics and Realism I.4.8 [Computing Methodologies]: image processing AND computer VISION Scene Analysis

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Using efficient visual exploration techniques to evaluate features for content-based image retrieval 16

Using efficient visual exploration techniques to evaluate fe...

引用

16th brazilian symposium on computer graphics and image processing

作者： Rodrigues, JF Castañón, CAB Traina, C Traina, AJM Univ Sao Paulo Dept Comp Sci BR-13566590 Sao Carlos SP Brazil

ISBN: (纸本)0769520324

this paper presents a novel visual approach to evaluate, ill a fast and effective way, the development of new image feature extraction techniques concerning content-based image retrieval. this new approach takes advantage of all interactive 3-dimensional visualization fed by the image features obtained through a given extraction technique under analysis. Using controlled test image datasets, the researcher can literally "see" the discrimination power of the image features. this new approach gives a very good insight of the behavior of a given image feature extractor algorithm, which are confirmed by the the well-known precision and recall measurements. We applied the visual approach proposed onto a wavelet-based image retrieval system, which is supporting the development of a Picture Archiving and Communication System that allows to retrieve images by content.

关键词： Biomedical imaging Content based retrieval Feature extraction Humans image retrieval Indexing Information retrieval Medical diagnostic imaging Picture archiving and communication systems Testing

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Frequency plot and relevance plot to enhance visual data exploration 16

Frequency plot and relevance plot to enhance visual data exp...

引用

16th brazilian symposium on computer graphics and image processing

作者： Rodrigues, JF Traina, AJM Traina, C Univ Sao Paulo Dept Comp Sci BR-13566590 Sao Carlos SP Brazil

ISBN: (纸本)0769520324

this paper presents two techniques aiming at exploring databases through multivariate visualizations. Both techniques intend to deal with the problem caused by the limited amount of elements that can be presented simultaneously in traditional visual exploration procedures. the first technique, the Frequency Plot, combines data frequency with interactive filtering to identify clusters and trends in subsets of the database. thus, graphical elements (lines, pixels, icons, or graphical marks) are color differentiated proportionally to how frequent the value being represented is, while interactive filtering allows the selection of interesting partitions of the database. the second technique presented in this work, the Relevance Plot, corresponds to assigning different levels of color distinguishably to visual elements according to their relevance to a user's specified data properties set, which can be chosen visually, and dynamically.

关键词： computer science Data analysis Data visualization Filtering Frequency Humans image databases Information retrieval Layout Visual databases

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