به نام خدا
Title: Query-Specific Visual Semantic Spaces for Web Image Re-ranking
Authors: Xiaogang Wang,Ke Liu,Xiaoou Tang,
Abstract: Image re-ranking, as an effective way to improve the re-sults of web-based image search, has been adopted by cur-rent commercial search engines. Given a query keyword, apool of images are first retrieved by the search engine basedon textual information. By asking the user to select a queryimage from the pool, the remaining images are re-rankedbased on their visual similarities with the query image. Amajor challenge is that the similarities of visual features donot well correlate with images_ semantic meanings whichinterpret users_ search intention. On the other hand, learn-ing a universal visual semantic space to characterize highlydiverse images from the web is difficult and inefficient.In this paper, we propose a novel image re-rankingframework, which automatically offline learns different vi-sual semantic spaces for different query keywords throughkeyword expansions. The visual features of images are pro-jected into their related visual semantic spaces to get se-mantic signatures. At the online stage, images are re-rankedby comparing their semantic signatures obtained from thevisual semantic space specified by the query keyword. Thenew approach significantly improves both the accuracy andefficiency of image re-ranking. The original visual featuresof thousands of dimensions can be projected to the seman-tic signatures as short as 25 dimensions. Experimental re-sults show that 20% - 35% relative improvement has beenachieved on re-ranking precisions compared with the state-of-the-art methods.
Publish Year: 2011
Published in: CVPR - IEEE
Number of Pages: 8
موضوع: وب معنایی
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به نام خدا
Title: Video Based Palmprint Recognition
Authors: Chhaya Methani and Anoop M Namboodiri
Abstract: The use of camera as a biometric sensor is desir-able due to its ubiquity and low cost, especially for mo-bile devices. Palmprint is an effective modality in suchcases due to its discrimination power, ease of presen-tation and the scale and size of texture for capture bycommodity cameras. However, the unconstrained na-ture of pose and lighting introduces several challengesin the recognition process. Even minor changes in poseof the palm can induce significant changes in the vis-ibility of the lines. We turn this property to our ad-vantage by capturing a short video, where the naturalpalm motion induces minor pose variations, providingadditional texture information. We propose a method toregister multiple frames of the video without requiringcorrespondence, while being efficient. Experimental re-sults on a set of different 100 palms show that the use ofmultiple frames reduces the error rate from 12.75% to4.7%. We also propose a method for detection of poorquality samples due to specularities and motion blur,which further reduces the EER to 1.8%.
Publish Year: 2010
Publisher: ICPR - IEEE
Number of Pages: 4
موضوع: تشخیص اثر کف دست
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به نام خدا
Title: Assessing ICT User Groups
Authors: Benjamin Weiss, Ina Wechsung, Stefanie Marquardt
Abstract: A questionnaire to assess attitude towards information and communication technology (ICT) and experience with it is developed and evaluated. With 30 items user attributes are collected on six factors. With this questionnaire, individual users can be clustered in accordance with an existing ICT taxonomy. A revised version is proposed after the validation of the first questionnaire. This screening instrument is meant to complement existing methods of assessing competency with technology. Furthermore, the possibility to classify users within the ICT taxonomy provides additional means to analyze data from interaction experiments and to screen prospective participants for usability tests and scientific experiments.
Publish Year: 2012
Published in: NordiCHI - ACM
Number of Pages: 9
موضوع: فناوری اطلاعات و ارتباطات
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به نام خدا
Title: Agile and Efficient MIMO System for Smart Phone Terminals
Authors: Osama N Alrabad, Elpiniki P Tsakalaki, Mauro Pelosi, Gert F Pedersen
Abstract: The paper proposes a novel multi-input multi-output (MIMO) system architecture that covers most of the high L TE bands. The system is comprised of four small loop antennas. Each antenna has two ports, one for communication and one for control. The control port is used for tuning the loop antenna where impressive frequency agility using a single capacitor is obtained. A good level of inherent isolation among the four loop antennas is maintained over the different frequency bands. The MIMO performance of the proposed system is evaluated through its spectral efficiency versus frequency. Finally, the information bandwidth of the MIMO system can be defined by comparing its spectral efficiency against the spectral efficiency of three ideal MIMO antennas.
Publish Year: 2013
Published in: iWat - IEEE
Number of Pages: 4
موضوع: تلفنهای هوشمند
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به نام خدا
Title: Interface-Based Object-Oriented Design with Mock Objects
Authors: Nandigam, J.; Gudivada, V.N.; Hamou-Lhadj, A.; Yonglei Tao
Abstract: Interfaces are fundamental in object-oriented systems. One of the principles of reusable object-oriented design, according to Gamma et al., is program to an interface, not an implementation. Interface-based systems display three key characteristics - flexibility, extensibility, and pluggability. Designing with interfaces is therefore a better way of building object-oriented systems. Getting students in introductory software engineering and design courses to program to interfaces and develop interface-based systems is a challenge. This paper presents our experiences with the use of mock objects to promote interface-based design and effective unit testing in software engineering and design courses.
Publish Year: 2009
Publisher: ITNG - IEEE
Number of Pages: 6
موضوع: طراحی و تحلیل شی گرا
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حامی دانش بومی ایرانیان