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检索条件"任意字段=Multimedia on Mobile Devices 2012;and Multimedia Content Access: Algorithms and Systems VI"

共 40 条记录，以下是11-20 订阅

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SUPL Support for mobile devices

SUPL Support for Mobile Devices

引用

Conference on multimedia on mobile devices and multimedia content access - algorithms and systems vi

作者： Narisetty, Jayanthi Soghoyan, Arpine Sundaramurthy, Mohanapriya Akopian, David Univ Texas San Antonio San Antonio TX 78249 USA

ISBN: (纸本)9780819489517

Conventional Global Positioning System (GPS) receivers operate well in open-sky environments. But their performance degrades in urban canyons, indoors and underground due to multipath, foliage, dissipation, etc. To overcome such situations, several enhancements have been suggested such as Assisted GPS (A-GPS). Using this approach, orbital parameters including ephemeris and almanac along with reference time and coarse location information are provided to GPS receivers to assist in acquisition of weak signals. To test A-GPS enabled receivers high-end simulators are used, which are not affordable by many academic institutions. This paper presents an economical A-GPS supplement for inexpensive simulators which operates on application layer. Particularly proposed solution is integrated with National Instruments' (NI) GPS Simulation Toolkit and implemented using NI's Labview environment. This A-GPS support works for J2ME and Android platforms. The communication between the simulator and the receiver is in accordance with the Secure User Plane Location (SUPL) protocol encapsulated with Radio Resource Location Protocol (RRLP) applies to Global System for mobile Communications (GSM) and Universal mobile Telecommunications System (UMTS) cellular networks.

关键词： Global Positioning System Java Receivers mobile devices Computer programming Satellites LabviEW Global system for mobile communications Telecommunications Satellite navigation systems

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Measuring ionizing radiation with a mobile device

Measuring ionizing radiation with a mobile device

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Conference on multimedia on mobile devices and multimedia content access - algorithms and systems vi

作者： Michelsburg, Matthias Fehrenbach, Thomas Leon, Fernando Puente Inst Ind Informat Technol Karlsruhe Inst Technol D-76131 Karlsruhe Germany

ISBN: (纸本)9780819489517

In cases of nuclear disasters it is desirable to know one's personal exposure to radioactivity and the related health risk. Usually, Geiger-Mueller tubes are used to assess the situation. Equipping everyone with such a device in a short period of time is very expensive. We propose a method to detect ionizing radiation using the integrated camera of a mobile consumer device, e. g., a cell phone. In emergency cases, millions of existing mobile devices could then be used to monitor the exposure of its owners. In combination with internet access and GPS, measured data can be collected by a central server to get an overview of the situation. During a measurement, the CMOS sensor of a mobile device is shielded from surrounding light by an attachment in front of the lens or an internal shutter. The high-energy radiation produces free electrons on the sensor chip resulting in an image signal. By image analysis by means of the mobile device, signal components due to incident ionizing radiation are separated from the sensor noise. With radioactive sources present significant increases in detected pixels can be seen. Furthermore, the cell phone application can make a preliminary estimate on the collected dose of an individual and the associated health risks.

关键词： ionizing radiation radioactivity mobile device cell phone smartphone CMOS imaging chip camera

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Searching through Photographic Databases with QuickLook

Searching through Photographic Databases with QuickLook

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Conference on multimedia on mobile devices and multimedia content access - algorithms and systems vi

作者： Ciocca, Gianluigi Cusano, Claudio Schettini, Raimondo Santini, Simone de Polo, Andrea Tavanti, Francesca Univ Milano Bicocca Viale Sarca 336 I-20126 Milan Italy Univ Autonoma Madrid Madrid 28049 Spain Alinari 24 ORE SpA RD Multimedia Lab I-50123 Florence Italy

ISBN: (纸本)9780819489517

We present here the results obtained by including a new image descriptor, that we called prosemantic feature vector, within the framework of QuickLook(2) image retrieval system. By coupling the prosemantic features and the relevance feedback mechanism provided by QuickLook(2), the user can move in a more rapid and precise way through the feature space toward the intended goal. The prosemantic features are obtained by a two-step feature extraction process. At the first step, low level features related to image structure and color distribution are extracted from the images. At the second step, these features are used as input to a bank of classifiers, each one trained to recognize a given semantic category, to produce score vectors. We evaluated the efficacy of the prosemantic features under search tasks on a dataset provided by Fratelli Alinari Photo Archive.

关键词： Image retrieval image indexing semantic gap prosemantic features

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Continuously Adjustable Pulfrich Spectacles for mobile devices

Continuously Adjustable Pulfrich Spectacles for Mobile Devic...

引用

Conference on multimedia on mobile devices and multimedia content access - algorithms and systems vi

作者： Jacobs, Ken Karpf, Ron SUNY Binghamton Binghamton NY 13901 USA

ISBN: (纸本)9780819489517

mobile devices present a challenging platform for 3D video because of inherent device limitations. Continuously Adjustable Pulfrich Spectacles for mobile devices (CAPS-MD) is a new implementation of the Pulfrich 3D stereoscopic effect. For every scene that contains lateral motion in a 2D movie, CAPS-MD provides realistic 3D. Since it requires minimal additional processing, it is appropriate for mobile devices. 3D movies utilizing the Pulfrich stereoscopic effect have been made for 80 years using passive viewing spectacles. CAPS-MD use active viewing spectacles to overcome the limitations of passive spectacles. 3D movies normally employ the asymmetry of dual images to produce stereopsis. CAPS-MD works on the principle of illumination asymmetry, and only needs to control the differential lens optical densities. CAPS-MD is fabricated from optoelectronic materials that electronically control the lens optical densities. The eye's retinal triggering is used by CAPS-MD to determine the differential lens optical densities. Motion estimation calculations from the digital image processing used to display 2D video on mobile devices are reused to calculate real-time lens adjustments so CAPS-MD always conform to the optical density that optimizes the Pulfrich stereoscopic effect. Only negligible additional processing is necessary for CAPS-MD to show 3D for every scene that contains lateral motion in any 2D movie.

关键词： Pulfrich effect Continuously Adjustable Pulfrich Spectacles mobile devices Translational research

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Deblocking of mobile stereo video

Deblocking of mobile stereo video

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Conference on multimedia on mobile devices and multimedia content access - algorithms and systems vi

作者： Azzari, Lucio Gotchev, Atanas Egiazarian, Karen Tampere Univ Technol Dept Signal Proc FIN-33101 Tampere Finland

ISBN: (纸本)9780819489517

Most of candidate methods for compression of mobile stereo video apply block-transform based compression based on the H-264 standard with quantization of transform coefficients driven by quantization parameter (QP). The compression ratio and the resulting bit rate are directly determined by the QP level and high compression is achieved for the price of visually noticeable blocking artifacts. Previous studies on perceived quality of mobile stereo video have revealed that blocking artifacts are the most annoying and most influential in the acceptance/rejection of mobile stereo video and can even completely cancel the 3D effect and the corresponding quality added value. In this work, we address the problem of deblocking of mobile stereo video. We modify a powerful non-local transform-domain collaborative filtering method originally developed for denoising of images and video. The method employs grouping of similar block patches residing in spatial and temporal vicinity of a reference block in filtering them collaboratively in a suitable transform domain. We study the most suitable way of finding similar patches in both channels of stereo video and suggest a hybrid four-dimensional transform to process the collected synchronized (stereo) volumes of grouped blocks. The results benefit from the additional correlation available between the left and right channel of the stereo video. Furthermore, addition sharpening is applied through an embedded alpha-rooting in transform domain, which improve the visual appearance of the deblocked frames.

关键词： video video compression Gaussian filters Quantization video processing visualization 3D video compression Optical filters Image filtering Signal processing

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Using Wi-Fi-Hotspots as an intrusion vector into corporate networks

Using Wi-Fi-Hotspots as an intrusion vector into corporate n...

引用

Conference on multimedia on mobile devices and multimedia content access - algorithms and systems vi

作者： Scharsich, Maximilian Holl, Friedrich L. Univ. of Applied Sciences Brandenburg (Germany)

ISBN: (纸本)9780819489517

The following paper describes a method of gaining access to corporate networks through users who use virtual private networks over a modified Hotspot under the control of an attacker. Over 100,000 Hotspots offer an easy access to the Internet throughout the world. Almost every operator will inform the user though that browsing via a Hotspot is insecure because the connection is unencrypted. Hotspots often offer no typical encryption like WEP, WPA or WPA2;the communication is just send over the air, readable for everyone. This situation is not unknown - the Firesheep-Plugin for Firefox shows this impressive. One possible solution is the usage of a virtual Private Network (VPN), which enables the user to communicate through a secure tunnel. In this typical business case the company's VPN is used to access internal documents and work with business' applications. All data sent out via a Hotspot using a VPN is encrypted and unreadable for potential attackers. But, what if the Hotspot, the user's connected to, is already under the control of an attacker? Nowadays it's easy to use hardware which extends the range of the Wi-Fi enormously and to set up an own Hotspot (with little expense). If an attacker then copies the login-site of a legit Hotspot and adapts his Hotspot in order to show the same site, he won't just be able to obtain the users credentials, he will also be capable of implementing malware into that site to gain access to the victim's personal device. Now that the attacker has gained access, he can start sniffing around and will possibly find out that a VPN application is being executed. If the attacker finds a proper application, he can start to use the victim's device to access the internal structure of the corporate network;the device now serves as a router for the attacker. Security mechanisms like firewalls and IDS, which are normally used as perimeter protection, won't be able to detect the attacker because he uses legitimate communication tunnels to get

关键词： Internet Control systems Network security Computer security Data communications Java multimedia Applied sciences Imaging systems mobile devices

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Detection of Symmetric Shapes on a mobile Device with Applications to Automatic Sign Interpretation

Detection of Symmetric Shapes on a Mobile Device with Applic...

引用

Conference on multimedia on mobile devices and multimedia content access - algorithms and systems vi

作者： Haddad, Andrew W. Huang, Shanshan Boutin, Mireille Delp, Edward J. Purdue Univ Video & Image Proc Lab VIPER Sch Elect & Comp Engn W Lafayette IN 47907 USA

ISBN: (纸本)9780819489517

We present a light-weight method for automatically detecting shapes that have an approximate rotational symmetry (e. g., a square or equilateral triangle) on discrete-space images. Our motivation is the problem of automatically detecting and recognizing hazardous material placards on a mobile platform (e. g., a mobile telephone) equipped with a camera. The proposed method is well-suited for mobile device applications, which are characterized by limited memory, processing power and battery life. It is based on comparing the magnitude of the coefficients of the Fourier series of the centralized moments of the Radon transform of the image after segmentation. However, in our approach, the computation of the Radon transform is bypassed as we obtain these coefficients directly from the rows of the Pascal Triangle of the segmented image. The Pascal Triangle of an image is composed of complex moments arranged in a pyramidal fashion similar to the binomial coefficients. These complex moments are obtained from a coarse segmentation of the shape represented by a gray-scale image. In particular, the contours of the object do not need to be precisely defined, and the shape needs not be connected. Moreover, our approach is invariant under translation, rotation, and scaling. We tested our method on images from the MPEG-7 shape database as well as images from our own database of hazardous material placards.

关键词： Invariant Moments Radon Transform Symmetry Detection Shape Detection Image Recognition Rotational Symmetry

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Large-scale classification of traffic signs under real-world conditions

Large-scale classification of traffic signs under real-world...

引用

Conference on multimedia on mobile devices and multimedia content access - algorithms and systems vi

作者： Hazelhoff, Lykele Creusen, Ivo van de Wouwa, Dennis de With, Peter H. N. CycloMedia Technol BV NL-4181 AE Waardenburg Netherlands

ISBN: (纸本)9780819489517

Traffic sign inventories are important to governmental agencies as they facilitate evaluation of traffic sign locations and are beneficial for road and sign maintenance. These inventories can be created (semi-) automatically based on street-level panoramic images. In these images, object detection is employed to detect the signs in each image, followed by a classification stage to retrieve the specific sign type. Classification of traffic signs is a complicated matter, since sign types are very similar with only minor differences within the sign, a high number of different signs is involved and multiple distortions occur, including variations in capturing conditions, occlusions, viewpoints and sign deformations. Therefore, we propose a method for robust classification of traffic signs, based on the Bag of Words approach for generic object classification. We extend the approach with a flexible, modular codebook to model the specific features of each sign type independently, in order to emphasize at the inter-sign differences instead of the parts common for all sign types. Additionally, this allows us to model and label the present false detections. Furthermore, analysis of the classification output provides the unreliable results. This classification system has been extensively tested for three different sign classes, covering 60 different sign types in total. These three data sets contain the sign detection results on street-level panoramic images, extracted from a country-wide database. The introduction of the modular codebook shows a significant improvement for all three sets, where the system is able to classify about 98% of the reliable results correctly.

关键词： Classification Object Detection Bag of Words Traffic Sign Recognition Inventory systems

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Design and Evaluation of Security Multi-Media Warnings for Children's Smartphones

Design and Evaluation of Security Multi-Media Warnings for C...

引用

Conference on multimedia on mobile devices and multimedia content access - algorithms and systems vi

作者： Menzel, Wiebke Tuchscheerer, Sven Fruth, Jana Kraetzer, Christian Dittmann, Jana Otto von Guericke Univ D-39016 Magdeburg Germany

ISBN: (纸本)9780819489517

This article describes primarily the development and empiric validation of a design for security warning messages on smartphones for primary school children (7-10 years old). Our design approach for security warnings for children uses a specific character and is based on recommendations of a paediatrician expert. The design criteria are adapted to children's skills, e. g. their visual, acoustic, and haptic perception and their literacy. The developed security warnings are prototypically implemented in an iOS application (on the iPhone 3G/4G) where children are warned by a simulated anti-malware background service, while they are busy with another task. For the evaluation we select methods for empiric validation of the design approach from the field of usability testing ("think aloud" test, questionnaires, log-files, etc.). Our security warnings prototype is evaluated in an empiric user study with 13 primary school children, aged between 8 and 9 years and of different gender (5 girls, 8 boys). The evaluation analysis shows, that nearly all children liked the design of our security warnings. Surprisingly, on several security warning messages most of the children react in the right way after reading the warning, although the meaning couldn't be interpreted in the right way. Another interesting result is, that several children relate specific information, e. g. update, to a specific character. Furthermore, it could be seen that most of the primary school test candidates have little awareness of security threats on smartphones. It is a very strong argument to develop e. g. tutorials or websites in order to raise awareness and teach children how to recognize security threats and how to react to them. Our design approach of security warnings for children's smartphones can be a basis for warning on other systems or applications like tutorials, which are used by children. In a second investigation, we focus on webpages, designed for children since smartphones and webpages (t

关键词： security warnings webpages children user-centered studies smartphones

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ArabicTutor: a multimedia m-Learning Platform for Learning Arabic Spelling and Vocabulary

ArabicTutor: a Multimedia m-Learning Platform for Learning A...

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International Conference on multimedia Computing and systems (ICMCS)

作者： Erradi, Abdelkarim Nahia, Sajeda Almerekhi, Hind Al-kailani, Lubna Qatar Univ Dept Comp Sci & Engn Doha Qatar

ISBN: (纸本)9781467315203

Internet-enabled mobile devices are increasingly used for enhancing the learning experience particularly for language learning. They can be exploited to allow learners to access and interact with multimedia learning resources from anywhere and at any time while offering an enhanced user experience. There are many systems for English learning such as ***. However there aren't many such mobile learning tools for Arabic. In this context, this paper addresses the need to leverage mobile-supported learning to ease learning Arabic. We report the experience of designing and developing a multimedia m-Learning platform (named ArabicTutor) for interactive learning of Arabic spelling and vocabulary. It uses interactive game-like delivery methods to acquire new linguistic skills in playful manner using the capabilities of modern mobile devices with multitouch technologies. The proposed platform provides an environment of authoring Arabic learning content and delivering it to the end-users in interactive, intuitive and enjoyable way. The learning content is organized into packages that contain a list of word, the different meanings of words with example sentences and multimedia illustrations. The package also contains other related linguistic and morphological information such as parts of speech of example sentences and their diacritization.

关键词： multimedia m-Learning Technology-enhanced Language Learning ArabicTutor

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