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

作者： Lee, Gwangsoon Lee, Hyun Yun, Kugjin Hur, Namho Lee, Soo In Elect & Telecommun Res Inst Taejon South Korea

ISBN: (纸本)9780819484185

In this paper, we present a development of 3D-T DMB (three-dimensional digital multimedia broadcasting) receiver for providing 3D video and data service. First, for a 3D video service, the developed receiver is capable of decoding and playing 3D Av contents that is encoded by simulcast encoding method and that is transmitted via T-DMB network. Second, the developed receiver can render stereoscopic multimedia objects delivered using MPEG-4 BIFS technology that is also employed in T-DMB. Specially, this paper introduces hardware and software architecture and its implementation of 3D T-DMB receiver. The developed 3D T-DMB receiver has capabilities of generating stereoscopic viewing on the glasses-free 3D mobile display, therefore we propose parameters for designing the 3D display, together with evaluating the viewing angle and distance through both computer simulation and actual measurement. Finally, the availability of 3D video and data service is verified using the experimental system including the implemented receiver and a variety of service examples.

关键词： 3DTv mobile broadcasting data service stereoscopic

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3D scene reconstruction based on multi-view distributed video coding in the Zernike domain for mobile applications

3D scene reconstruction based on multi-view distributed vide...

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

作者： Palma, v. Carli, M. Neri, A. Univ Roma TRE Dept Appl Elect Rome Italy

ISBN: (纸本)9780819484185

In this paper a Multi-view Distributed video Coding scheme for mobile applications is presented. Specifically a new fusion technique between temporal and spatial side information in Zernike Moments domain is proposed. Distributed video coding introduces a flexible architecture that enables the design of very low complex video encoders compared to its traditional counterparts. The main goal of our work is to generate at the decoder the side information that optimally blends temporal and interview data. Multi-view distributed coding performance strongly depends on the side information quality built at the decoder. At this aim for improving its quality a spatial view compensation/prediction in Zernike moments domain is applied. Spatial and temporal motion activity have been fused together to obtain the overall side-information. The proposed method has been evaluated by rate-distortion performances for different inter-view and temporal estimation quality conditions.

关键词： Multi-view video coding Zernike moments distributed video coding

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SMART TRAvEL GUIDE: FROM INTERNET IMAGE DATABASE TO INTELLIGENT SYSTEM

SMART TRAVEL GUIDE: FROM INTERNET IMAGE DATABASE TO INTELLIG...

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

作者： Gael, Chareyron Jerome, Da Rugna Cousin, Saskia Pole Univ Leonard de Vinci ESILV 12 Ave L de Vinci Paris France IIAC LAIOS F-75006 Paris France

ISBN: (纸本)9780819484185

To help the tourist to discover a city, a region or a park, many options are provided by public tourism travel centers, by free online guides or by dedicated book guides. Nonetheless, these guides provide only mainstream information which are not conform to a particular tourist behavior. On the other hand, we may find several online image databases allowing users to upload their images and to localize each image on a map. These websites are representative of tourism practices and constitute a proxy to analyze tourism flows. Then, this work intends to answer this question: knowing what I have visited and what other people have visited, where should I go now? This process needs to profile users, sites and photos. our paper presents the acquired data and relationship between photographers, sites and photos and introduces the model designed to correctly estimate the site interest of each tourism point. The third part shows an application of our schema: a smart travel guide on geolocated mobile devices. This android application is a travel guide truly matching the user wishes.

关键词： tourism mobile application flow geolocated photographies

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mobile 3D quality of experience evaluation: A hybrid data collection and analysis approach

Mobile 3D quality of experience evaluation: A hybrid data co...

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

作者： Utriainen, Timo Hayrynen, Jyrki Jumisko-Pyykko, Satu Boev, Atanas Gotchev, Atanas Hannuksela, Miska M. Tampere Univ Technol Human Centered Technol Korkeakoulunkatu 10POB 527 FI-33101 Tampere Finland Tampere Univ Technol Dept Signal Proc FI-33101 Tampere Finland Nokia Res Ctr FI-33721 Tampere Finland

ISBN: (纸本)9780819484185

The paper presents a hybrid approach to study the user's experienced quality of 3D visual content on mobile auto-stereoscopic displays. It combines extensive subjective tests with collection and objective analysis of eye-tracked data. 3D cues which are significant for mobiles are simulated in the generated 3D test content. The methodology for conducting subjective quality evaluation includes hybrid data-collection of quantitative quality preferences, qualitative impressions, and binocular eye-tracking. We present early results of the subjective tests along with eye movement reaction times, areas of interest and heatmaps obtained from raw eye-tracked data after statistical analysis. The study contributes to the question what is important to be visualized on portable auto-stereoscopic displays and how to maintain and visually enhance the quality of 3D content for such displays.

关键词： experienced quality visual quality 3D autostereoscopic display binocular eye-tracking

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Multimodal sensing-based camera applications

Multimodal sensing-based camera applications

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

作者： Lopez, Miguel Bordallo Hannuksela, Jari Silven, Olli vehvilainen, Markku Univ Oulu Machine Vision Grp Oulu Finland Nokia Res Ctr Tampere Finland

ISBN: (纸本)9780819484185

The increased sensing and computing capabilities of mobile devices can provide for enhanced mobile user experience. Integrating the data from different sensors offers a way to improve application performance in camera-based applications. A key advantage of using cameras as an input modality is that it enables recognizing the context. Therefore, computer vision has been traditionally utilized in user interfaces to observe and automatically detect the user actions. The imaging applications can also make use of various sensors for improving the interactivity and the robustness of the system. In this context, two applications fusing the sensor data with the results obtained from video analysis have been implemented on a Nokia Nseries mobile device. The first solution is a real-time user interface that can be used for browsing large images. The solution enables the display to be controlled by the motion of the user's hand using the built-in sensors as complementary information. The second application is a real-time panorama builder that uses the device's accelerometers to improve the overall quality, providing also instructions during the capture. The experiments show that fusing the sensor data improves camera-based applications especially when the conditions are not optimal for approaches using camera data alone.

关键词： Computer vision data fusion motion sensor user interface mobile device

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Progressive imagery with scalable vector graphics

Progressive imagery with scalable vector graphics

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

作者： Fuchs, Georg Schumann, Heidrun Rosenbaum, Rene Univ Rostock Inst Comp Sci D-18051 Rostock Germany Univ Calif Davis Inst Data Anal & Visualizat Davis CA 95616 USA

ISBN: (纸本)9780819484185

vector graphics can be scaled without loss of quality, making them suitable for mobile image communication where a given graphics must be typically represented in high quality for a wide range of screen resolutions. One problem is that file size increases rapidly as content becomes more detailed, which can reduce response times and efficiency in mobile settings. Analog issues for large raster imagery have been overcome using progressive refinement schemes. Similar ideas have already been applied to vector graphics, but an implementation that is compliant to a major and widely adopted standard is still missing. In this publication we show how to provide progressive refinement schemes based on the extendable Scalable vector Graphics (SvG) standard. We propose two strategies: decomposition of the original SvG and incremental transmission using (1) several linked files and (2) element-wise streaming of a single file. The publication discusses how both strategies are employed in mobile image communication scenarios where the user can interactively define RoIs for prioritized image communication, and reports initial results we obtained from a prototypically implemented client/server setup.

关键词： Progression Progressive refinement Scalable vector Graphics SvG mobile image communication

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Quality and noise measurements in mobile phone video capture

Quality and noise measurements in mobile phone video capture

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

作者： Petrescu, Doina Pincenti, John Motorola Mobil Libertyville IL 60048 USA

ISBN: (纸本)9780819484185

The quality of videos captured with mobile phones has become increasingly important particularly since resolutions and formats have reached a level that rivals the capabilities available in the digital camcorder market, and since many mobile phones now allow direct playback on large HDTvs. The video quality is determined by the combined quality of the individual parts of the imaging system including the image sensor, the digital color processing, and the video compression, each of which has been studied independently. In this work, we study the combined effect of these elements on the overall video quality. We do this by evaluating the capture under various lighting, color processing, and video compression conditions. First, we measure full reference quality metrics between encoder input and the reconstructed sequence, where the encoder input changes with light and color processing modifications. Second, we introduce a system model which includes all elements that affect video quality, including a low light additive noise model, ISP color processing, as well as the video encoder. Our experiments show that in low light conditions and for certain choices of color processing the system level visual quality may not improve when the encoder becomes more capable or the compression ratio is reduced.

关键词： mobile phones video compression color processing image sensor

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mobile Text Messaging Solutions for Obesity Prevention

Mobile Text Messaging Solutions for Obesity Prevention

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

作者： Akopian, David Jayaram, varun Aaleswara, Lakshmipathi Esfahanian, Moosa Mojica, Cynthia Parra-Medina, Deborah Kaghyan, Sahak Univ Texas San Antonio San Antonio TX 78249 USA Univ Texas Hlth Sci Ctr San Antonio San Antonio TX USA Yerevan State Univ Yerevan Armenia

ISBN: (纸本)9780819484185

Cellular telephony has become a bright example of co-evolution of human society and information technology. This trend has also been reflected in health care and health promotion projects which included cell phones in data collection and communication chain. While many successful projects have been realized, the review of phone-based data collection techniques reveals that the existing technologies do not completely address health promotion research needs. The paper presents approaches which close this gap by extending existing versatile platforms. The messaging systems are designed for a health-promotion research to prevent obesity and obesity-related health disparities among low-income Latino adolescent girls. Messaging and polling mechanisms are used to communicate and automatically process response data for the target constituency. Preliminary survey data provide an insight on phone availability and technology perception for the study group.

关键词： text messaging health promotion health disparities

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Optimizing bandwidth and storage requirements for mobile images using perceptual-based JPEG recompression

Optimizing bandwidth and storage requirements for mobile ima...

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

作者： Shoham, Tamar Gill, Dror Carmel, Sharon ICVT Ltd Tel Aviv Israel

ISBN: (纸本)9780819484185

The increasing quality and resolution of cellular phone cameras is creating a significant burden on mobile device storage and network bandwidth requirements. In this paper we propose a novel method for recompressing digital photos, which significantly reduces their file size, without affecting their spatial resolution or perceptual quality. By operating within the scope of baseline JPEG, we ensure that the resulting image files can be viewed and edited with any software, browser or consumer device. The proposed method is applied by iteratively recompressing the input image to varying degrees, while computing the value of a novel, robust, perceptual image quality measure. When the image quality measure falls within a pre-determined perceptual quality range, the iterative compression process ends and the resulting image is output. This process ensures that the near maximum amount of compression, which still yields a perceptually identical image, is applied to each input image. Subjective testing of obtained results has shown that using our proposed method, the file size of photos may be reduced by a factor of up to 4X (75% reduction) without affecting their visual quality. Feasibility of the proposed method for mobile applications has been established by implementation on the iPhone 3Gs device.

关键词： JPEG recompression perceptual quality measure photo upload mobile imaging bandwidth optimization

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video personalization in heterogeneous and resource-constrained environments

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multimedia systems 2011年第6期17卷 523-543页

作者： Wei, Yong Bhandarkar, Suchendra M. Li, Kang Ramaswamy, Lakshmish N Georgia Coll & State Univ Dept Math & Comp Sci Dahlonega GA 30597 USA Univ Georgia Dept Comp Sci Athens GA 30602 USA

access to multimedia data and multimedia services is becoming increasingly common in networked mobile environments. In such environments, both the mobile client devices and multimedia servers are typically resource constrained. Moreover, the mobile client population is often heterogeneous in terms of the clients' preferences with regard to multimedia content, the clients' quality of service requirements and system-level resource constraints. In order to provide a resource-constrained mobile client with its desired video content, it is often necessary to personalize the requested multimedia content in a manner that satisfies simultaneously the various client-specified content preferences and the system-level resource constraints. Also, in order to simultaneously reduce the client-experienced latency, provide optimal quality of service to the clients and ensure efficient utilization of server and network resources, it is necessary to perform client request aggregation on the server end. To this end, a video personalization strategy is proposed to provide mobile, resource-constrained clients with personalized video content that is most relevant to the clients' requests while satisfying simultaneously multiple client-side system-level resource constraints. A client request aggregation strategy is also proposed to cluster client requests with similar video content preferences and similar client-side resource constraints such that the number of requests the server needs to process and service, and the client-experienced latency are both reduced simultaneously. The primary contributions of the paper are: (1) the formulation and implementation of a Multiple-choice Multi-dimensional Knapsack Problem (MMKP)-based video personalization strategy;and (2) the design and implementation of a client request aggregation strategy based on a multi-stage clustering algorithm. Experimental results comparing the proposed MMKP-based video personalization strategy to existing 0/1 Knapsack P

关键词： video personalization Request aggregation mobile multimedia Resource-constrained multimedia Multiple-choice Multi-dimensional Knapsack Problem (MMKP)

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