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Noisy Image Edge Detection Using an Uninorm Fuzzy Morphological Gradient

Noisy Image Edge Detection Using an Uninorm Fuzzy Morphologi...

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International Conference on Intelligent Systems Design and Applications (ISDA)

作者： Manuel González-Hidalgo Arnau Mir Torres Joan Torrens Sastre Computer Graphics and Vision Group Maths and Computer Science Department University of Balearic Islands Spain Fuzzy Logic and Information Fusion Group Maths and Computer Science Department University of Balearic Islands Spain

Medical images edge detection is one of the most important pre-processing steps in medical image segmentation and 3D reconstruction. In this paper, an edge detection algorithm using an uninorm-based fuzzy morphology is proposed. It is shown that this algorithm is robust when it is applied to different types of noisy images. It improves the results of other well-known algorithms including classical algorithms of edge detection, as well as fuzzy-morphology based ones using the ¿ukasiewicz t-norm and umbra approach. It detects detailed edge features and thin edges of medical images corrupted by impulse or gaussian noise. Moreover, some different objective measures have been used to evaluate the filtered results obtaining for our approach better values than for other approaches.

关键词： Image edge detection Morphology Biomedical imaging Fuzzy sets Gray-scale computer vision Noise reduction Image processing Application software computer science

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Cross-talk measurement for 3D dispalays

Cross-talk measurement for 3D dispalays

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3DTV Conference

作者： Vaclav Skala Center of Computer Graphics and Visualization Faculty of Applied Sciences Department of Computer Science and Engineering University of West Bohemia Plzen Czech Republic

3D displays are coming phenomenon of the nearest future and it is expected that 3D displays will be widely available soon. There are currently some 3D displays available and also some notebooks with 3D display as Sharp AL3D. The viewing position is quite restricted spatially in the case of 3D displays and also the (visual information for the left eye is taken by the right eye and vice versa) causes some severe problems in 3D image perception. This paper addresses several issues concerning 3D perception based on stereo-images. Another issues related to 3D stereo video perception, like discontinuities between frames etc. are not described here.

关键词： Three dimensional displays Testing Visualization Cameras Optical distortion computer aided manufacturing CADCAM Geographic Information Systems Chromium Frequency

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Partial matching of interpose 3D facial data for face recognition

Partial matching of interpose 3D facial data for face recogn...

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IEEE International Conference on Biometrics: Theory, Applications, and Systems (BTAS)

作者： P. Perakis G. Passalis T. Theoharis G. Toderici I.A. Kakadiaris Computational Biomedicine Laboratory Department of Computer Science University of Houston TX USA Computer Graphics Laboratory Department of Informatics and Telecommunications University of Athens (NKUA) Ilisia Greece

Three-dimensional face recognition has lately received much attention due to its robustness in the presence of lighting and pose variations. However, certain pose variations often result in missing facial data. This is common in realistic scenarios, such as uncontrolled environments and uncooperative subjects. Most previous 3D face recognition methods do not handle extensive missing data as they rely on frontal scans. Currently, there is no method to perform recognition across scans of different poses. A unified method that addresses the partial matching problem is proposed. Both frontal and side (left or right) facial scans are handled in a way that allows interpose retrieval operations. The main contributions of this paper include a novel 3D landmark detector and a deformable model framework that supports symmetric fitting. The landmark detector is utilized to detect the pose of the facial scan. This information is used to mark areas of missing data and to roughly register the facial scan with an Annotated Face Model (AFM). The AFM is fitted using a deformable model framework that introduces the method of exploiting facial symmetry where data are missing. Subsequently, a geometry image is extracted from the fitted AFM that is independent of the original pose of the facial scan. Retrieval operations, such as face identification, are then performed on a wavelet domain representation of the geometry image. Thorough testing was performed by combining the largest publicly available databases. To the best of our knowledge, this is the first method that handles side scans with extensive missing data (e.g., up to half of the face missing).

关键词： Face recognition Face detection Detectors Deformable models Geometry Robustness Data mining Image retrieval Wavelet domain Testing

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***: Transforming Colour into Melody and Implementing the Result in a Colour Sensor Device

***: Transforming Colour into Melody and Implementing the Re...

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International Conference on Visualisation, VIS

作者： Jessica Rossi Francisco Jose Perales Javier Varona Miquel Roca Computer Graphics Vision and Artificial Intelligence Group Mathematics and Computers Science Department University of Balearic Islands Spain

This paper represents a system which explores the reality of colour in relation to sound and dedicated firstly to blind people, the challenges they live with, their psychology and their emotions. Itpsilas an exploration of the infinite range of colours that they have either never been able to see or that they have lost the possibility to see. The system developed is based on the concept of synesthesia: a dasialiaisonpsila between colour and sound, colour that becomes sound. This paper synthesizes a wider range of study regarding people with diverse psychological and movement conditions. It represents a new method of expression and of self development through music therapy and game, dedicated mainly to children aged between 5 and 13. Finally we conclude with a portable prototype device that has been validated and patented. It is capable of detecting colour and transforming it into sound: a colour sensor identifies colours and transforms this data into musical notes. The prototype is totally adaptable to the requirements of the end user meaning that the user can choose the best combination between colour and sound in order to improve their communication with the environment. We are now developing a mathematical theoretical background in order to formalize the correspondence between colour and musical space.

关键词： Psychology Acoustic sensors Prototypes Cultural differences Auditory system Vision defects Visualization Intelligent sensors Sensor systems computer graphics

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Survey of the visual exploration and analysis of perfusion data

Survey of the visual exploration and analysis of perfusion d...

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作者： Preim, Bernhard Oeltze, Steffen Mlejnek, Matej Gröller, Eduard Hennemuth, Anja Behrens, Sarah Department of Simulation and Graphics Faculty of Computer Science University of Magdeburg Universitätsplatz 2 D-39106 Magdeburg Germany AGFA Healthcare Dietrichsteingasse 8/14 A-1090 Vienna Austria Institute of Computer Graphics and Algorithms Vienna University of Technology Favoritenstrasse 9-11/E186 A-1040 Vienna Austria MeVis Research Universitätsallee 29 D-28359 Bremen Germany MeVis Medical Solutions Universitätsallee 29 D-28359 Bremen Germany

Dynamic contrast-enhanced image data (perfusion data) are used to characterize regional tissue perfusion. Perfusion data consist of a sequence of images, acquired after a contrast agent bolus is applied. Perfusion data are used for diagnostic purposes in oncology, ischemic stroke assessment or myocardial ischemia. The diagnostic evaluation of perfusion data is challenging, since the data is complex and exhibits various artifacts, e.g., motion artifacts. We provide an overview on existing methods to analyze, and visualize CT and MR perfusion data. The integrated visualization of several 2D parameter maps, the 3D visualization of parameter volumes and exploration techniques are discussed. An essential aspect in the diagnosis of perfusion data is the correlation between perfusion data and derived time-intensity curves as well as with other image data, in particular with high resolution morphologic image data. We discuss visualization support with respect to the three major application areas: ischemic stroke diagnosis, breast tumor diagnosis and the diagnosis of coronary heart disease. © 2006 IEEE.

关键词： Volume rendering

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Feature Selection in the Tensor Product Feature Space

Feature Selection in the Tensor Product Feature Space

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IEEE International Conference on Data Mining (ICDM)

作者： Aaron Smalter Jun Huan Gerald Lushington Department of Electrical Engineering and Computer Science University of Kansas USA Molecular Graphics and Modeling Laboratory University of Kansas Lawrence KS USA

Classifying objects that are sampled jointly from two or more domains has many applications. The tensor product feature space is useful for modeling interactions between feature sets in different domains but feature selection in the tensor product feature space is challenging. Conventional feature selection methods ignore the structure of the feature space and may not provide the optimal results. In this paper we propose methods for selecting features in the original feature spaces of different domains. We obtained sparsity through two approaches, one using integer quadratic programming and another using L1-norm regularization. Experimental studies on biological data sets validate our approach.

关键词： Tensile stress Kernel Proteins Predictive models Application software Data mining computer graphics Laboratories Industry applications Stacking

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A Watermark Extraction Model to Enhance the Correlation of Digimarc Plug-ins in Photoshop

A Watermark Extraction Model to Enhance the Correlation of D...

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International Conference on Multimedia Information Networking and Security (MINES)

作者： Li Li Hehuan Xu Chin Chen Cheng Institute of Graphics and Image Hangzhou Dianzi University Hangzhou China Department of Information Engineering and Computer Science Feng Chia University FCU Taichung Taiwan

Considering the watermark as a noise, a watermark extraction model is proposed in this paper to enhance the correlation of Digimarc plug-ins in photoshop. First, an estimation of the original image for a watermarked image is obtained by TV (total variation) denoising model based on the partial differential equation. Second, watermark noise information is obtained by subtraction between the watermarked image and the estimated one. Finally, the correlation of watermark can be improved by magnifying the watermark noise. The experimental results show that the new watermark extraction model can enhance the correlation of the Digimarc plug-ins although its watermarking method is unknown.

关键词： Watermarking Data mining Copyright protection Noise robustness Authentication Gaussian noise Discrete cosine transforms Software tools Information security graphics

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On the Triangle-Perimeter Two-Site Voronoi Diagram

On the Triangle-Perimeter Two-Site Voronoi Diagram

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International Symposium on Voronoi Diagrams in science and Engineering (ISVD)

作者： Iddo Hanniel Gill Barequet Research Group Solid Works Corporation Concord MA USA Center of Graphics and Geometric Computing Department of Computer Science Technion-Israel Institute of Technology Israel

The triangle-perimeter 2-site distance function defines the "distance" P(x, (p, q)) from a point x to two other points p, q as the perimeter of the triangle whose vertices are x, p, q. Accordingly, given a set S of n points in the plane, the Voronoi diagram of S with respect to P, denoted as V P (S), is the subdivision of the plane into regions, where the region of p, q ¿ S is the locus of all points closer to p, q (according to P) than to any other pair of sites in S. In this paper we prove a theorem about the perimeters of triangles, two of whose vertices are on a given circle. We use this theorem to show that the combinatorial complexity of V P (S) is O(n 2+¿ ) (for any ¿ > 0). Consequently, we show that one can compute V P (S) on O(n 2+¿ ) time and space.

关键词： computer science Q measurement Mobile antennas Transmitting antennas computer graphics Crystallography Geography Metrology Biology Mathematics

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On Voronoi Diagrams for Lines in the Plane

On Voronoi Diagrams for Lines in the Plane

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International Conference on Computational science and its Applications (ICCSA)

作者： Gill Barequet Kira Vyatkina Center of Graphics and Geometric Computing Department of Computer Science Technion-Israel Institute of Technology Haifa Israel Department of Mathematics and Mechanics Saint Petersburg State University Saint Petersburg Russia

We describe a method based on the wavefront propagation, which computes a multiplicatively weighted Voronoi diagram for a set L of n lines in the plane in O(n 2 log n) time and O(n 2 ) space. In the process, we derive complexity bounds and certain structural properties of such diagrams. An advantage of our approach over the general purpose machinery, which requires computation of the lower envelope of a set of halfplanes in three-dimensional space, lies in its relative simplicity. Besides, we point out that the unweighted Voronoi diagram for n lines in the plane has a simple structure, and can be obtained in optimal thetas(n 2 ) time and space.

关键词： Machinery Euclidean distance Application software computer graphics computer science Mathematics

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Learning a nonlinear color distance metric for the identification of skin immunohistochemical staining

Learning a nonlinear color distance metric for the identific...

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2009 22nd IEEE International Symposium on computer-Based Medical Systems, CBMS 2009

作者： Sobieranski, Antonio Carlos Neto, Sylvio Luiz Mantelli Coser, Leandro Comunello, Eros Von Wangenheim, Aldo Cargnin-Ferreira, Eduardo Di Giunta, Gabriella LAPIX Laboratory of Image Processing and Computer Graphics UFSC Federal University of Santa Catarina Brazil CPTEC Center for Weather Forecasts and Environment Studies INPE - Brazilian Institute for Space Research Brazil EGC Knowledge Engineering Department UFSC - Federal University of Santa Catarina Brazil MCA Graduate Program in Applied Computer Science UNIVALI - Itajai Valley University Brazil Laboratory of Histological Markers Department of Biology Embriology and Genetics UFSC - Federal University of Santa Catarina Brazil Pathology Service UFSC - Federal University of Santa Catarina Brazil

ISBN: (纸本)9781424448784

This paper presents a semiautomatic method for the identification of immunohistochemical (IHC) staining in digitized samples. The user trains the system by selecting on a sample image some typical positive stained regions that will be used as a reference for the construction of a distance metric. In this learning process, the global optimum is obtained by induction employing higher polynomial terms of the Mahalanobis distance, extracting nonlinear features of the IHC pattern distributions. The results of the proposed method showed a high correlation to a pathologist's manual analysis, which was used as a golden standard, presenting a more robust discrimination between stained and non-stained areas with little bias. © 2009 IEEE.

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