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Multi-step integer algorithm for non-unit voxel traversing along a 3D line

Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of computer-Aided Design and computer graphics 2006年第6期18卷 812-818页

作者： Liu, Yongkui Yun, Jian Wang, Xiaoqiang Song, Haiyu Institute of Computer Graphics and Image Processing Dalian Nationalities University Dalian 116600 China

An algorithm for traversing voxels along a 3D line using only integer arithmetic is presented. Two kinds of subdivision, namely non-unit space subdivision and non-square space subdivision, could be used. A 2D algorithm is first developed to find out the pixels a line passes through. Then based on it, an algorithm for traversing voxels along a 3D line in uniformly divided voxel space is proposed. Up to 3 voxels may be processed in one step and no accumulated error is made. The discriminator used in this algorithm is well refined, so that few calculations are required and the algorithm is simple and compact in form. Its comparison with existing voxel traversal algorithms shows that the new algorithm is not only free from accumulated error but also is the fastest.

关键词： 3D line generation Algorithm Traversal Voxel

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Active Feature Models

Active Feature Models

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International Conference on Pattern Recognition

作者： G. Langs P. Peloschek R. Donner M. Reiter H. Bischof Institute for Computer Graphics and Vision Graz University of Technology Austria Pattern Recognition and Image Processing Group University of Technology Vienna Austria Department of Radiology Medical University of Vienna Austria

ISBN: (纸本)0769525210

In this paper active feature models are proposed. They utilize local texture features and a statistical shape model for the reliable localization of landmarks in images. They are related to active appearance models, but instead of modelling the entire texture of an object they represent image texture by means of local descriptors. The approach has advantages with complex image data like anatomical structures that exhibit high texture variation with limited relevance for the recognition of the object location. Experimental results and the comparison to AAMs on different data sets indicate that active feature models can improve search speed and result accuracy, considerably

关键词： Shape Active appearance model Biomedical imaging image texture image edge detection image texture analysis computer graphics Pattern recognition image processing Radiology

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Automatic Surveying of Cutaneous Hemangiomas

Automatic Surveying of Cutaneous Hemangiomas

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International Conference on Pattern Recognition

作者： S. Zambanini G. Langs R. Sablatnig P. Donath H. Maier Pattern Recognition and Image Processing Group University of Technology Vienna Austria Institute for Computer Graphics and Vision Graz University of Technology Austria Division of Special and Environmental Dermatologyy Medical University of Vienna Austria

This paper presents a method for the fully automatic surveying of cutaneous hemangiomas by means of a hemangioma segmentation and a ruler visible in the images. The algorithm computes the spatial resolution of an image. Hemangioma segmentation is accomplished by a single-layer perceptron classification by means of pixel color features. The algorithm was evaluated on a set of 120 images. It achieves satisfactory results on images with clearly visible, saturated hemangiomas

关键词： image segmentation Neoplasms Pattern recognition Spatial resolution Lesions Area measurement Pixel image processing computer graphics Biomedical imaging

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Tillarom: An AJAX based folk song search and retrieval system with gesture interface based on kodály hand

Tillarom: An AJAX based folk song search and retrieval syste...

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1st ACM International Workshop on Human-Centered Multimedia, HCM 2006, co-located with the 2006 ACM International Multimedia Conference

作者： Licsár, Attila Szirányi, Tamás Kovács, László Pataki, Balázs University of Pannonia Department of Image Processing and Neurocomputing Egyetem u. 10 H-8200 Veszprém Hungary Department of Distributed Systems Computer and Automation Research Institute Hungarian Academy of Sciences Lágymányosi u. 11 H-1111 Budapest Hungary Analogical and Neural Computing Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Lágymányosi u. 11 H-1111 Budapest Hungary

ISBN: (纸本)1595935002

A digital folk song search and retrieval system with a hand gesture based interface is presented. Tillarom is a comprehensive collection of original Hungarian folk songs recorded using different technologies such as phonographs and/or stereo DAT cassettes. This digital archive contains professional quality metadata records as well as MIDI recordings for presenting the different types of clustered folk songs. An AJAX based search and retrieval interface was developed that can be used together with optically recognized Kodály's hand signs to formulate queries through a web browser. The appearance based recognition of hand gestures utilizes contour analysis and SVM based classification. We evaluated the performance of the recognition of hand signs and investigated the main problems of their usage in our system. Copyright 2006 ACM.

关键词： Information systems

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Single landmark based self-localization of mobile robots

Single landmark based self-localization of mobile robots

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Canadian Conference on computer and Robot Vision, CRV

作者： A. Bais R. Sablatnig J. Gu Robotics Research Group Department of Electrical and Computer Engineering Dalhousie University Halifax Canada Institute of Computer Technology University of Technology Vienna Vienna Austria Pattern Recognition and Image Processing Group Institute of Computer Aided Automation University of Technology Vienna Vienna Austria

In this paper we discuss landmark based absolute localization of tiny autonomous mobile robots in a known environment. Landmark features are naturally occurring as it is not allowed to modify the environment with special navigational aids. These features are sparse in our application domain and are frequently occluded by other robots. This makes simultaneous acquisition of two or more landmarks difficult. Therefore, we propose a system that requires a single landmark feature. The algorithm is based on range measurement of a single landmark from two arbitrary points whose displacement can be measured using dead-reckoning sensors. Range estimation is done with a stereo vision system. Simulation results show that the robot can localize itself if it can estimates range of the same landmark from two different position and if the displacement between the two position is known.

关键词： Mobile robots Robot sensing systems Robot vision systems Cameras Navigation Position measurement Robotics and automation Displacement measurement Educational robots Goniometers

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CNNUM-Based Methods Using Deformable Contours on Smooth Boundaries

CNNUM-Based Methods Using Deformable Contours on Smooth Boun...

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： Tamas Szabo Peter Szolgay Department of Image Processing and Neurocomputing Faculty of Information Technology University of Pannonia Veszprem Hungary Analogical and Neural Computing Systems Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

In this paper two methods are presented. A CNNUM-based method is shown to quantify the displacement of the normal interhemisperic bilateral symmetry line. The method uses a deformable open contouring technique. Anothe... 详细信息

关键词： Active contours Computed tomography Magnetic resonance Anatomical structure image segmentation Biomedical imaging Electronic mail computer networks Pixel image resolution

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FPGA Based Implementation of Water Reinjection in Geothermal Structure

FPGA Based Implementation of Water Reinjection in Geothermal...

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： S. Kocsardi Z. Nagy S. Kostianev P. Szolgay Department of Image Processing and Neurocomputing University of Pannonia Veszprem Hungary Department of Mathematical Geophysics University of Mining and Geology Sofia Bulgaria Analogic and Neural Computing Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

In the area of geophysical and mining engineering the solution of partial differential equations (PDE) has been one of the most important problems of mathematics for a long time. Inside that one of the most exciting fields is the simulation of geothermal processes which can be used in the everyday energy-management. In this contribution a CNN-UM simulation of water reinjection are presented. Unfortunately the three dimensional - or the coupled multi-layered - computational structure and space-variant templates do not make it possible to utilize the huge computing power of the analog CNN-UM chips. To improve the performance of our solution an emulated digital CNN-UM has been used

关键词： Field programmable gate arrays Filtration Cellular neural networks Heat transfer Geophysics computing Electronic mail Partial differential equations Analog computers Water heating Differential equations

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A survey of medical applications of 3D image analysis and computer graphics

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Systems and computers in Japan 2006年第1期37卷 13-46页

作者： Muraki, Shigeru Kita, Yasuyo National Institute of Advanced Industrial Science and Technology Tokyo 135-0064 Japan Information Technology Research Institute National Institute of Advanced Industrial Science and Technology Tsukuba 305-8568 Japan Video Information Media Society Japan Neural Network Society ACM IEEE Computer Society Information Technology Research Institute National Institute of Advanced Industrial Science and Technology Information Processing Society Japan Medical Image Engineering Society

This paper is a survey of visualization and analysis techniques for medical 3D images for researchers and students in computer science. Publications from this decade with internationally high evaluation are reviewed, focusing on medical applications of new mathematical techniques and computer hardware, mostly from the viewpoint of the authors' specialty, namely, volume graphics and computer vision. © 2005 Wiley Periodicals, Inc.

关键词： image analysis

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An advanced emulated digital retina model on FPGA to implement a real-time test environment

An advanced emulated digital retina model on FPGA to impleme...

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Proceedings of 2006 IEEE International Symposium on Circuits and Systems,Volume 4

作者： Z. Nagy Zs. Voroshazi P. Szolgay Department of Image Processing and Neurocomputing University of Veszprém Veszprem Hungary Analogic and Neural Computing Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Hungary

This paper presents an extended emulated digital retina model to compute two different retina channels in video real-time. The proposed emulated digital implementation of the two-channel retina model was compared to the previously developed single channel model from three different points of view: processing speed, number of physical cells and accuracy. A real-time test environment with camera input and display output is going to be set up to analyze the retina model implementation on emulated digital CNN (Cellular Neural/Nonlinear Network) model by using a 6M gate equivalent FPGA (Field Programmable Gate Array).

关键词： Retina Field programmable gate arrays Cellular neural networks Neurons Hardware Automatic testing Differential equations Cameras Nonhomogeneous media computer architecture

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Reconstruction of pixel-based and geometric objects by discrete tomography. Simulation and physical experiments

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Electronic Notes in Discrete Mathematics 2005年 20卷 475-491页

作者： Kiss, Zoltán Rodek, Lajos Nagy, Antal Kuba, Attila Balaskó, Márton Dept. of Image Proc. and Computer Graphics Univ. of Szeged Szeged Hungary KFKI Atomic Energy Research Institute Budapest Hungary

Tomography is an imaging technique to reconstruct cross-sections of objects from projection images in a non-destructive way. We have implemented two discrete tomographic (DT) reconstruction methods. The first method is general in the sense that the objects to be reconstructed are represented by pixels, and in this way the method can be used for reconstructing any shape. The second one is able to reconstruct objects consisting of cylinders and spheres made of homogeneous materials only. Simulation and physical experiments connected with non-destructive testing by X-rays were performed, and the results are presented. © 2005 Elsevier B.V. All rights reserved.

关键词： discrete tomography optimization simulated annealing stochastic relaxation

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