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An efficient algorithm for fractal analysis of textures

An efficient algorithm for fractal analysis of textures

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25th Conference on graphics, Patterns and images, SIBGRAPI 2012

作者： Costa, Alceu Ferraz Humpire-Mamani, Gabriel Traina, Agma Juci MacHado Department of Computer Science University of São Paulo USP São Carlos Brazil

ISBN: (纸本)9780769548296

In this paper we propose a new and efficient texture feature extraction method: the Segmentation-based Fractal Texture Analysis, or SFTA. The extraction algorithm consists in decomposing the input image into a set of binary images from which the fractal dimensions of the resulting regions are computed in order to describe segmented texture patterns. The decomposition of the input image is achieved by the Two-Threshold Binary Decomposition (TTBD) algorithm, which we also propose in this work. We evaluated SFTA for the tasks of content-based image retrieval (CBIR) and image classification, comparing its performance to that of other widely employed feature extraction methods such as Haralick and Gabor filter banks. SFTA achieved higher precision and accuracy for CBIR and image classification. Additionally, SFTA was at least 3.7 times faster than Gabor and 1.6 times faster than Haralick with respect to feature extraction time. © 2012 IEEE.

关键词： Feature extraction

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FPGA-based SIFT implementation for wearable computing 22

FPGA-based SIFT implementation for wearable computing

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22nd IEEE International symposium on Design and Diagnostics of Electronic Circuits and Systems (DDECS)

作者： Fejer, Attila Nagy, Zoltan Benois-Pineau, Jenny Szolgay, Peter de Rugy, Aymar Domenger, Jean-Philippe Univ Bordeaux Lab Bordelais Rech Informat Bordeaux France Pazmany Peter Catholic Univ Fac Informat Technol & Bion Budapest Hungary Univ Bordeaux Inst Neurosci Cognit & Intgrat Aquitaine Bordeaux France

ISBN: (纸本)9781728100739

The article describes the first steps to achieve control over a robotic or prosthetic arm based on analysis of visual environment acquired in real-time by video cameras on glasses and on the prosthesis. One of the main goals of the research is to develop a wearable, portable, lightweight, and low power consumption device for visual scene analysis. This paper will discuss the critical steps of its implementation on an FPGA board. We implemented some time-consuming parts of the SIFT algorithm needed for the analysis in C/C++ language on TUL PYNQ-Z2 FPGA board. This implementation allows for a low power consumption of the programmable logic part of the system. The obtained value is 0.274W. processing capacity is 96.45 images per second on a small wearable size device which allow for the real-time implementation of the whole analysis in the future.

关键词： FPGA SIFT prosthetic arm computer vision image processing

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Reducing the run-time of MCMC programs by multithreading on SMP architectures

Reducing the run-time of MCMC programs by multithreading on ...

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10th Workshop on Advances in Parallel and Distributed Computational Models/22nd IEEE International Parallel and Distributed processing symposium

作者： Byrd, Jonathan M. R. Jarvis, Stephen A. Bhalerao, Abhir H. Univ Warwick Dept Comp Sci Coventry CV4 7AL W Midlands England

ISBN: (纸本)9781424416936

The increasing availability of multi-core and multiprocessor architectures provides new opportunities for improving the performance of many computer simulations. Markov Chain Monte Carlo (MCMC) simulations are widely used for approximate counting problems, Bayesian inference and as a means for estimating very high-dimensional integrals. As such MCMC has found a wide variety of applications in fields including computational biology and physics, financial econometrics, machine learning and image processing. This paper presents a new method for reducing the run-time of Markov Chain Monte Carlo simulations by using SMP machines to speculatively perform iterations in parallel, reducing the runtime of MCMC programs whilst producing statistically identical results to conventional sequential implementations. We calculate the theoretical reduction in runtime that may be achieved using our technique under perfect conditions, and test and compare the method on a selection of multi-core and multi-processor architectures. Experiments are presented that show reductions in runtime of 35% using two cores and 55% using four cores.

关键词： image processing

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3D triangulations for industrial applications

3D triangulations for industrial applications

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25th Conference on graphics, Patterns and images, SIBGRAPI 2012

作者： Cavalcanti, Paulo Roma Atencio, Yalmar Ponce Esperanca, Claudio Nascimento, Flavio Pereira Department of Computer Science Universidade Federal Do Rio de Janeiro Rio de Janeiro Brazil COPPE Sistemas Universidade Federal Do Rio de Janeiro Rio de Janeiro Brazil

ISBN: (纸本)9780769548296

This paper presents a methodology for creating 3D non-structured meshes for industrial applications, which honor all the boundaries of the domain. The input for the system is a multi-region 3D non-manifold model, possibly containing dangling faces, which poses a number of difficulties for standard 3D triangulation frameworks. The main contribution of this work consists of a detailed description of how these difficulties were overcome in a real implementation. © 2012 IEEE.

关键词： Triangulation

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Characterizing energy consumption in hardware transactional memory systems

Characterizing energy consumption in hardware transactional ...

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22nd International symposium on computer Architecture and High Performance Computing, SBAC-PAD 2010

作者： Gaona-Raḿirez, Epifanio Titos-Gil, Rub´en Ferńandez, Juan Acacio, Manuel E. Computer Engineering Department University of Murcia Murcia Spain

ISBN: (纸本)9780769542164

Transactional Memory is currently being advocated as a promising alternative to lock-based synchronization because it simplifies multithreaded programming. In this way, future many-core CMP architectures may need to provide hardware support for transactional memory. On the other hand, power dissipation constitutes a first class consideration in multicore processor design. In this work, we characterize the performance and energy consumption of two well-known Hardware Transactional Memory systems that employ opposite policies for data versioning and conflict management. More specifically, we compare the LogTM-SE Eager-Eager system and a version of the Scalable TCC Lazy-Lazy system that enables parallel commits. To the best of our knowledge, this is the first characterization in terms of energy consumption of hardware transactional memory systems. To do that, we extended the GEMS simulator to estimate the energy consumed in the on-chip caches according to CACTI, and used the interconnection network energy model given by Orion 2. Results show that the energy consumption of the Eager-Eager system is 60% higher on average than in the Lazy-Lazy case, whereas performance differences between the two systems are 42% on average. Finally, we found that although on average Lazy-Lazy beats Eager-Eager there are considerable deviations in performance depending on the particular characteristics of each application. © 2010 IEEE.

关键词： Energy utilization

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Tree projection-based frequent itemset mining on multi-core CPUs and GPUs

Tree projection-based frequent itemset mining on multi-core ...

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22nd International symposium on computer Architecture and High Performance Computing, SBAC-PAD 2010

作者： George, Teodoro Nathan, Mariano Wagner Jr., Meira Renato, Ferreira Department of Computer Science Universidade Federal de Minas Gerais Brazil

ISBN: (纸本)9780769542164

Frequent itemset mining (FIM) is a core operation for several data mining applications as association rules computation, correlations, document classification, and many others, which has been extensively studied over the last decades. Moreover, databases are becoming increasingly larger, thus requiring a higher computing power to mine them in reasonable time. At the same time, the advances in high performance computing platforms are transforming them into hierarchical parallel environments equipped with multi-core processors and many-core accelerators, such as GPUs. Thus, fully exploiting these systems to perform FIM tasks poses as a challenging and critical problem that we address in this paper. We present efficient multi-core and GPU accelerated parallelizations of the Tree Projection, one of the most competitive FIM algorithms. The experimental results show that our Tree Projection implementation scales almost linearly in a CPU shared-memory environment after careful optimizations, while the GPU versions are up to 173 times faster than standard the CPU version. © 2010 IEEE.

关键词： Data mining

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Digital visual information processing: adding vision and graphics

Digital visual information processing: adding vision and gra...

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International symposium on image and Signal processing and Analysis

作者： F.W. Leberl Institute for Computer Graphics and Vision Graz University of Technology Graz Austria

ISBN: (纸本)9539676924

Models of the real world are at least 3-dimensional and require the technologies of image processing and computer graphics. We see the processing of images, be they of the real world or of models in a computer, as one and the same basic technology, namely "digital visual information processing". This paper seeks to illustrate and justify this point-of-view by means of examples taken mostly from the work at the author's institute.

关键词： Information processing computer graphics Rendering (computer graphics) Pipelines computer vision Signal processing image analysis Signal analysis image sequence analysis image texture analysis

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Multi-scale spectral residual analysis to speed up image object detection

Multi-scale spectral residual analysis to speed up image obj...

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25th Conference on graphics, Patterns and images, SIBGRAPI 2012

作者： Silva, Grimaldo Schnitman, Leizer Oliveira, Luciano Programme of Post-graduation in Mechatronics Intelligent Vision Research Laboratory UFBA Brazil

ISBN: (纸本)9780769548296

Accuracy in image object detection has been usually achieved at the expense of much computational load. Therefore a trade-off between detection performance and fast execution commonly represents the ultimate goal of an object detector in real life applications. In this present work, we propose a novel method toward that goal. The proposed method was grounded on a multi-scale spectral residual (MSR) analysis for saliency detection. Compared to a regular sliding window search over the images, in our experiments, MSR was able to reduce by 75% (in average) the number of windows to be evaluated by an object detector. The proposed method was thoroughly evaluated over a subset of Label Me dataset (person images), improving detection performance in most cases. © 2012 IEEE.

关键词： Economic and social effects

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Implementation of On-site Virtual Time Machine for Mobile Devices

Implementation of On-site Virtual Time Machine for Mobile De...

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22nd IEEE Virtual Reality Conference (VR)

作者： Nakano, Junichi Narumi, Takuji Tanikawa, Tomohiro Hirose, Michitaka Univ Tokyo Tokyo 1138654 Japan

ISBN: (纸本)9781479917273

In this study, we developed a system for mobile devices designed to provide a virtual experience of past scenery depicted in old photographs by superimposing them on landscapes in video see-through frames. A user is asked to capture a photograph of a landscape to be used as a keyframe and enter correspondence points between the new and old photos. The old photograph is deformed by projective transform with homography computed based on correspondence points. We then superimpose of the old photograph onto video see-through frames of current landscape. To achieve real-time and robust superimposition on mobile devices, both motion-sensor-based pose information and camera-image-keypoint-tracking-based pose information is used for device's camera pose tracking.

关键词： H.5.1 [Information interfaces and presentation]: Multimedia Information Systems-Artificial augmented and virtual realities 1.4.9 [image processing and computer vision]: Applications

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Structural analysis of histological images to aid diagnosis of cervical cancer

Structural analysis of histological images to aid diagnosis ...

引用

25th Conference on graphics, Patterns and images, SIBGRAPI 2012

作者： Miranda, Gisele Helena Barboni Barrera, Junior Soares, Edson Garcia Felipe, Joaquim Cezar Department of Computing and Mathematics Faculty of Philosophy Sciences and Languages of Ribeirão Preto USP Brazil Department of Computer Science Institute of Mathematics and Statistics USP Brazil Department of Pathology Faculty of Medicine of Ribeirão Preto USP Brazil

ISBN: (纸本)9780769548296

The use of computational techniques in the processing of histopathological images allows the study of the structural organization of tissues and their pathological changes. The overall objective of this work includes the proposal, the implementation and the evaluation of a methodology for the analysis of cervical intraepithelial neoplasia (CIN) from histopathological images. For this pourpose, a pipeline of morphological operators were implemented for the segmentation of cell nuclei and the Delaunay Triangulation were used in order to represent the tissue architecture. Also, clustering algorithms and graph morphology were used to automatically obtain the boundary between the histological layers of the epithelial tissue. Similarity criteria and adjacency relations between the triangles of the network were explored. The proposed method was evaluated concerning the detection of the presence of lesions in the tissue as well as the their malignancy grading. © 2012 IEEE.

关键词： Tissue

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