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检索条件"任意字段=Image Processing: Algorithms and Systems V"

共 2747 条记录，以下是1501-1510 订阅

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Efficient video search using image queries

Efficient video search using image queries

引用

作者： Araujo, A. Makar, M. Chandrasekhar, v. Chen, D. Tsai, S. Chen, H. Angst, R. Girod, B. Stanford University United States Qualcomm Inc. United States Institute for Infocomm Research Singapore Singapore

ISBN: (纸本)9781479957514

We study the challenges of image-based retrieval when the database consists of videos. This variation of visual search is important for a broad range of applications that require indexing video databases based on their visual contents. We present new solutions to reduce storage requirements, while at the same time improving video search quality. The video database is preprocessed to find different appearances of the same visual elements, and build robust descriptors. Compression algorithms are developed to reduce system's storage requirements. We introduce a dataset of CNN broadcasts and queries that include photos taken with mobile phones and images of objects. Our experiments include pairwise matching and retrieval scenarios. We demonstrate one order of magnitude storage reduction and search quality improvements of up to 12% in mean average precision, compared to a baseline system that does not make use of our techniques. © 2014 IEEE.

关键词： Database systems

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Clustering socio-demographic and medical attribute data in cohort studies

Clustering socio-demographic and medical attribute data in c...

引用

Workshops Bildverarbeitung fur die Medizin: Algorithmen - Systeme - Anwendungen, BvM 2014 - Workshop on image processing for Medicine: algorithms - systems - Applications, BvM 2014

作者： Klemm, Paul Frauenstein, Lisa Perlich, David Hegenscheid, Katrin v Ö Lzke, Henry Preim, Bernhard Otto-von-Guericke University Magdeburg Germany Ernst-Moritz-Arndt University Greifswald Germany

ISBN: (纸本)9783642541100

Longitudinal epidemiological studies like the Study of Health in Pomerania (SHIP) analyze a group of thousands of subjects (a cohort) by imposing a multitude of socio-demographic and biological factors. Epidemiological findings rest upon hypotheses which yield a selection of disease-specific cohort study parameters. They are then analyzed for significant interactions to identify risk factors. We propose an alternative approach by incorporating clustering algorithms with a visual Analytics system to form subject groups which are the basis for an exploratory analysis of the underlying parameter interactions. We investigated three clustering techniques (k-Prototypes, DBSCAN and hierarchical clustering) for their suitability in these data sets. With our system, groups can be automatically determined to provide insights into this complex data. © Springer-verlag Berlin Heidelberg 2014.

关键词： Clustering algorithms

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Robust real-time horizon detection in full-motion video

Robust real-time horizon detection in full-motion video

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Conference on Airborne Intelligence, Surveillance, Reconnaissance (ISR) systems and Applications XI

作者： Young, Grace B. Bagnall, Bryan Lane, Corey Parameswaran, Shibin La Jolla High Sch 750 Nautilus St La Jolla CA 92037 USA Space & Naval Warfare Syst Ctr Pacif San Diego CA 92152 USA

ISBN: (纸本)9781628410136

The ability to detect the horizon on a real-time basis in full-motion video is an important capability to aid and facilitate real-time processing of full-motion videos for the purposes such as object detection, recognition and other video/image segmentation applications. In this paper, we propose a method for real-time horizon detection that is designed to be used as a front-end processing unit for a real-time marine object detection system that carries out object detection and tracking on full-motion videos captured by ship/harbor-mounted cameras, Unmanned Aerial vehicles (UAvs) or any other method of surveillance for Maritime Domain Awareness (MDA). Unlike existing horizon detection work, we cannot assume a priori the angle or nature (for e.g. straight line) of the horizon, due to the nature of the application domain and the data. Therefore, the proposed real-time algorithm is designed to identify the horizon at any angle and irrespective of objects appearing close to and/or occluding the horizon line (for e.g. trees, vehicles at a distance) by accounting for its non-linear nature. We use a simple two-stage hierarchical methodology, leveraging color-based features, to quickly isolate the region of the image containing the horizon and then perform a more fine-grained horizon detection operation. In this paper, we present our real-time horizon detection results using our algorithm on real-world full-motion video data from a variety of surveillance sensors like UAvs and ship mounted cameras confirming the real-time applicability of this method and its ability to detect horizon with no a priori assumptions.

关键词： video video surveillance video processing Cameras Detection and tracking algorithms Unmanned aerial vehicles Feature extraction Sensors Surveillance Imaging systems

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3D video streaming transmission over OFDMA-based systems

3D video streaming transmission over OFDMA-based systems

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作者： Monteiro, v. Huq, Kazi M. S. Mumtaz, S. Marques, H. Thomos, C. Dagiuklas, T. Rodriguez, J. Universidade de Aveiro Instituto de Telecomunicações Portugal University of Kingston United Kingdom University of Patras Greece

ISBN: (纸本)9781479957514

Coordinated Multipoint systems (CoMP) have spurred considerable research activity in recent years as they enable both capacity and coverage improvement over conventional cellular systems with open issues in the design of radio resource management algorithms for this type of systems with the challenge of multiple sub-carriers resources available in the OFDMA (orthogonal frequency division multiple access) based systems. To partially solve these issues this paper proposes a user scheduling and resource allocation algorithm for distributed broadband wireless systems based on OFDMA (orthogonal frequency division multiple access) for the 3D video streaming service. The study considers a Manhattan network which is one of the most promising scenarios for CoMP. The algorithm combines the concepts of maximum carrier-to-interference scheduling and antenna selection to increase throughput and ensure zero intra-cell interference. The results show that the use of CoMP can provide significant advantages over conventional deployments in the 3D video streaming services. © 2014 IEEE.

关键词： Frequency division multiple access

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systems based on photogrammetry to evaluation of built heritage: Tentative guidelines and control parameters

Systems based on photogrammetry to evaluation of built herit...

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ISPRS Technical Commission v Symposium 2014

作者： valença, J. ICIST Polytechnic Institute of Coimbra Rua Pedro Nunes Quinta da Nora Coimbra3030-199 Portugal

ISBN: (纸本)9781629935201

Technological innovations based on close-range imaging have arisen. The developments are related with both the advances in mathematical algorithms and acquisition equipment. This evolution allows to acquire data with large and powerful sensors and the fast and efficient processing of data. In general, the preservation of built heritage have applied these technological innovations very successfully in their different areas of intervention, namely, photogrammetry, digital image processing and multispectral image analysis. Furthermore, commercial packages of software and hardware have emerged. Thus, guidelines to best-practice procedures and to validate the results usually obtained should be established. Therefore, simple and easy to understand concepts, even for nonexperts in the field, should relate the characteristics of: (i) objects under study;(ii) acquisition conditions;(iii) methods applied;and (iv) equipment applied. In this scope, the limits of validity of the methods and a comprehensive protocol to achieve the required precision and accuracy for structural analysis is a mandatory task. Application of close-range photogrammetry to build 3D geometric models and for evaluation of displacements are herein presented. Parameters such as distance-to-object, sensor size and focal length, are correlated to the precision and accuracy achieved for displacement in both experimental and on site environment. This paper shows an early stage study. The aim consist in defining simple expressions to estimate the characteristics of the equipment and/or the conditions for image acquisition, depending on the required precision and accuracy. The results will be used to define tentative guidelines considered the all procedure, from image acquisition to final results of coordinates and displacements.

关键词： Photogrammetry

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The effect of endoscopic lens distortion correction on physicians’ diagnosis performance

The effect of endoscopic lens distortion correction on physi...

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Workshops Bildverarbeitung fur die Medizin: Algorithmen - Systeme - Anwendungen, BvM 2014 - Workshop on image processing for Medicine: algorithms - systems - Applications, BvM 2014

作者： Gadermayr, Michael Uhl, Andreas vécsei, Andreas Department of Computer Sciences University of Salzburg Austria Department of Pediatrics St. Anna Children ’ s Hospital Austria

ISBN: (纸本)9783642541100

In endoscopic images, significant barrel-type distortions are introduced in case of deploying wide-angle lenses. In this work, the effect of lens distortion correction on the human experts’ classification performance is investigated. Especially, the discrimination between healthy patients and patients suffering from celiac disease is examined. Furthermore, the classification results of human experts are compared with those achieved with state-of-the-art computer aided decision support systems. This paper considers a two- as well as a four-classes case. Finally we come to the conclusion, that distortion correction does not improve the human experts’ classification performance. © Springer-verlag Berlin Heidelberg 2014.

关键词： Decision support systems

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Aesthetic Marker Decoding System for Indoor Robot Navigation

Aesthetic Marker Decoding System for Indoor Robot Navigation

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40th Annual Conference of the IEEE-Industrial-Electronics-Society (IECON)

作者： Farkas, Zita v. Szekeres, Kornel Korondi, Peter Budapest Univ Technol & Econ Dept Machine & Prod Design Budapest Hungary Budapest Univ Technol & Econ Dept Mechatron Opt & Engn Informat Budapest Hungary

ISBN: (纸本)9781479940325

We spend more than 80% of our lives indoors. Future indoor robot navigation is based on intelligent systems that provide accurate and smart information. In this paper we introduce a novel Aesthetic Marker decoding system, which finds and decodes machine readable visual markers inside buildings. Focused on seamless integration of visual code into our everyday human environment, our application has custom developed algorithms and functions that handle aesthetic marker data. As a result, image processing time was reduced and extracted information was maximized to calculate accurate robot position. A new Aesthetic Marker decoding method was created connecting the digital and physical world.

关键词： Aesthetic Marker smart code HRI robot navigation visual recognition micro-localization

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Proof-of-concept demonstration of a miniaturized three-channel multiresolution imaging system

Proof-of-concept demonstration of a miniaturized three-chann...

引用

Optics, Photonics, and Digital Technologies for Multimedia Applications III

作者： Belay, Gebirie Y. Ottevaere, Heidi Meuret, Youri vervaeke, Michael van Erps, Juergen Thienpont, Hugo Vrije Univ Brussel Fac Engn Dept Appl Phys & Photon TONA Brussels Photon TeamB PHOT B-1050 Brussels Belgium

ISBN: (纸本)9781628410860

Multichannel imaging systems have several potential applications such as multimedia, surveillance, medical imaging and machine vision, and have therefore been a hot research topic in recent years. Such imaging systems, inspired by natural compound eyes, have many channels, each covering only a portion of the total field-of-view of the system. As a result, these systems provide a wide field-of-view (FOv) while having a small volume and a low weight. Different approaches have been employed to realize a multichannel imaging system. We demonstrated that the different channels of the imaging system can be designed in such a way that they can have each different imaging properties (angular resolution, FOv, focal length). Using optical ray-tracing software (CODE v), we have designed a miniaturized multiresolution imaging system that contains three channels each consisting of four aspherical lens surfaces fabricated from PMMA material through ultra-precision diamond tooling. The first channel possesses the largest angular resolution (0.0096 degrees) and narrowest FOv (7 degrees), whereas the third channel has the widest FOv (80 degrees) and the smallest angular resolution (0.078 degrees). The second channel has intermediate properties. Such a multiresolution capability allows different image processing algorithms to be implemented on the different segments of an image sensor. This paper presents the experimental proof-of-concept demonstration of the imaging system using a commercial CMOS sensor and gives an in-depth analysis of the obtained results. Experimental images captured with the three channels are compared with the corresponding simulated images. The experimental MTF of the channels have also been calculated from the captured images of a slanted edge target test. This multichannel multiresolution approach opens the opportunity for low-cost compact imaging systems that can be equipped with smart imaging capabilities.

关键词： Multi-resolution imaging systems angular resolution multi-channel three-channel proof-of-concept demonstration

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Research and development of algorithms for objects detection on images of industrial materials

Research and development of algorithms for objects detection...

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International Conference on Mechanical Engineering, Automation and Control systems (MEACS)

作者： L.v. Antonov A.A. Orlov Department of Physics and Applied Mathematics “Vladimir State University named after Alexader Grigoryevich and Nickolay Grigoryevich Stoletovs” Murom Russia

The main current directions of research in nanoscale images processing of a high degree of detail are shown in the paper. A system of algorithms for solving a wide range of tasks for the structural analysis of the images of industrial materials has been developed. The experimental results of the developed algorithms have been presented in the article. The results of the image processing of industrial materials have been shown.

关键词： image segmentation image recognition

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Correlation Based Cryptanalysis on A Chaotic Encryption of JPEG image

Correlation Based Cryptanalysis on A Chaotic Encryption of J...

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International Congress on image and Signal processing

作者： Weihai Li Key Lab. of Electromagn. Space Inf. Univ. of Sci. & Technol. of China Hefei China

ISBN: (纸本)9781479958368

image encryption is a hotspot of multimedia security. Many researchers adopted chaotic systems as pseudo-random number generators in image encryptions considering the properties of high sensitivity, large periodicity, low computation cost, Unpredictable, and etc. However, there is no deterministic approach to prove whether the way of using chaotic systems in an image encryption algorithm is secure or not. In this paper, a cryptanalysis is made to decipher a recent proposed chaotic JPEG image encryption algorithm by reforming the scrambled orders via correlation analysis, due to the improper use of chaotic sequence. Experimental results demonstrate the effectiveness of this method.

关键词： chaos cryptography image coding random number generation chaotic JPEG image encryption algorithm chaotic sequence chaotic systems correlation based cryptanalysis multimedia security pseudorandom number generators scrambled orders via correlation analysis Algorithm design and analysis Chaos Encryption Multimedia communication Signal processing Signal processing algorithms JPEG image chaotic system correlation analysis cryptanalysis image encryption Chaotic systems JPEG image cryptography chaos Algorithm design and analysis Signal processing algorithms pseudorandom number generation Multimedia communications image coding signal processing chaotic encryption Pseudorandom number generator Correlation analysis CRYPTANALYSIS encryption algorithm

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