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200
Digital Item Adaptation: Overview of Standardization and Research Activities
- IEEE TRANSACTION ON MULTIMEDIA
, 2005
"... MPEG-21 Digital Item Adaptation (DIA) has recently ..."
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Cited by 61 (12 self)
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MPEG-21 Digital Item Adaptation (DIA) has recently
CANS: Composable, adaptive network services infrastructure
- in Proceedings of the USENIX Symposium on Internet Technologies and Systems (USITS’01
, 2001
"... Ubiquitous access to sophisticated internet services from diverse end devices across heterogeneous networks requires the injection of additional functionality into the network to handle protocol conversion, data transcoding, and in general bridge disparate network portions. Several researchers have ..."
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Cited by 60 (8 self)
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Ubiquitous access to sophisticated internet services from diverse end devices across heterogeneous networks requires the injection of additional functionality into the network to handle protocol conversion, data transcoding, and in general bridge disparate network portions. Several researchers have proposed infrastructures for injecting such functionality; however, many challenges remain before these can be widely deployed. CANS is an application-level infrastructure for injecting application-specific components into the network that focuses on three such challenges: (a) efficient and dynamic composition of individual components; (b) distributed adaptation of injected components in response to system conditions; and (c) support for legacy applications and services. The CANS network view comprises applications, stateful services, and data paths built from mobile soft-state objects called drivers. Both services and data paths can be dynamically created and reconfigured: a planning and event propagation model assists in distributed adaptation, and a flexible type-based composition model dictates how new services and drivers are integrated with existing components. Legacy components plug into CANS using an interception layer that virtualizes network bindings and a delegation model. This paper describes the CANS architecture, and a case study involving a shrink-wrapped client application in a dynamically changing network environment where CANS improves overall user experience. 1
Automatic browsing of large pictures on mobile devices
- ACM Multimedia
"... Pictures have become increasingly common and popular in mobile communications. However, due to the limitation of mobile devices, there is a need to develop new technologies to facilitate the browsing of large pictures on the small screen. In this paper, we propose a novel approach which is able to a ..."
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Cited by 57 (7 self)
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Pictures have become increasingly common and popular in mobile communications. However, due to the limitation of mobile devices, there is a need to develop new technologies to facilitate the browsing of large pictures on the small screen. In this paper, we propose a novel approach which is able to automate the scrolling and navigation of a large picture with a minimal amount of user interaction on mobile devices. An image attention model is employed to illustrate the information structure within an image. An optimal image browsing path is then calculated based on the image attention model to simulate the human browsing behaviors. Experimental evaluations of the proposed mechanism indicate that our approach is an effective way for viewing large images on small displays.
Video Transcoding: An Overview of Various Techniques and Research Issues
- IEEE TRANSACTIONS ON MULTIMEDIA
, 2005
"... One of the fundamental challenges in deploying multimedia systems, such as telemedicine, education, space endeavors, marketing, crisis management, transportation, and military, is to deliver smooth and uninterruptible flow of audio-visual information, anytime and anywhere. A multimedia system may co ..."
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Cited by 38 (1 self)
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One of the fundamental challenges in deploying multimedia systems, such as telemedicine, education, space endeavors, marketing, crisis management, transportation, and military, is to deliver smooth and uninterruptible flow of audio-visual information, anytime and anywhere. A multimedia system may consist of various devices (PCs, laptops, PDAs, smart phones, etc.) interconnected via heterogeneous wireline and wireless networks. In such systems, multimedia content originally authored and compressed with a certain format may need bit rate adjustment and format conversion in order to allow access by receiving devices with diverse capabilities (display, memory, processing, decoder). Thus, a transcoding mechanism is required to make the content adaptive to the capabilities of diverse networks and client devices. A video transcoder can perform several additional functions. For example, if the bandwidth required for a particular video is fluctuating due to congestion or other causes, a transcoder can provide fine and dynamic adjustments in the bit rate of the video bitstream in the compressed domain without imposing additional functional requirements in the decoder. In addition, a video transcoder can change the coding parameters of the compressed video, adjust spatial and temporal resolution, and modify the video content and/or the coding standard used. This paper provides an overview of several video transcoding techniques and some of the related research issues. We introduce some of the basic concepts of video transcoding, and then review and contrast various approaches while highlighting critical research issues. We propose solutions to some of these research issues, and identify possible research directions.
Object-based transcoding for adaptable video content delivery,”
- IEEE Transactions on Circuits and Systems for Video Technology,
, 2001
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Conca: An architecture for consistent nomadic content access
- IN: PROC. OF WORKSHOP ON CACHING, COHERENCE, AND CONSISTENCY
, 2001
"... Future access to web-based content is likely to be dominated by two trends: (a) increasing amounts of dynamic, personalized content, and (b) a significant growth in “on-the-move” access using various mobile resource-constrained devices. These trends point to a situation where a user would have ubiqu ..."
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Cited by 28 (14 self)
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Future access to web-based content is likely to be dominated by two trends: (a) increasing amounts of dynamic, personalized content, and (b) a significant growth in “on-the-move” access using various mobile resource-constrained devices. These trends point to a situation where a user would have ubiquitous access to content, but require that content be efficiently delivered to the user irrespective of location, and in a form most suited to the user’s end device. Unfortunately, classical caching and transcoding solutions do not work well together, necessitating a new caching architecture built from the ground-up to handle problems caused by dynamic content, transcoded versions of objects, and the nomadic nature of users. This paper describes the goals and architecture of such a system: CONCA, an architecture for Consistent Nomadic Content Access.
Caching Strategies in Transcoding-enabled Proxy Systems for Streaming Media Distribution Networks
, 2004
"... With the wide availability of high-speed network access, we are experiencing high quality streaming media delivery over the Internet. The emergence of ubiquitous computing enables mobile users to access the Internet with their laptops, PDAs, or even cell phones. When nomadic users connect to the ne ..."
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Cited by 27 (2 self)
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With the wide availability of high-speed network access, we are experiencing high quality streaming media delivery over the Internet. The emergence of ubiquitous computing enables mobile users to access the Internet with their laptops, PDAs, or even cell phones. When nomadic users connect to the network via wireless links or phone lines, high quality video transfer can be problematic due to long delay or size mismatch between the application display and the screen. Our proposed solution to this problem is to enable network proxies with the transcoding capability, and hence provide different, appropriate video quality to different network environment. The proxies in our transcoding-enabled caching (TeC) system perform transcoding as well as caching for efficient rich media delivery to heterogeneous network users. This design choice allows us to perform content adaptation at the network edges. We propose three different TeC caching strategies. We describe each algorithm and discuss its merits and shortcomings. We also study how the user access pattern affects the performance of TeC caching algorithms and compare them with other approaches. We evaluate TeC performance by conducting two types of simulation. Our first experiment uses synthesized traces while the other uses real traces derived from an enterprise media server logs. The results indicate that compared with the traditional network caches, with marginal transcoding load, TeC improves the cache effectiveness, decreases the user-perceived latency, and reduces the traffic between the proxy and the content origin server.
Visual attention based image browsing on mobile devices
- Proc. of ICME 2003
, 2003
"... Images have become more and more common in mobile communications. People now can easily take and exchange pictures on the move using their mobile devices and digital cameras. However, a crucial challenge is to provide a better user experience for browsing large images on limited and heterogeneous sc ..."
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Cited by 27 (4 self)
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Images have become more and more common in mobile communications. People now can easily take and exchange pictures on the move using their mobile devices and digital cameras. However, a crucial challenge is to provide a better user experience for browsing large images on limited and heterogeneous screen sizes of mobile devices. In this paper, we propose a novel image viewing technique based on an adaptive attention shifting model. A presentation technique named Rapid Serial Visual Presentation (RSVP), borrowed from the UI community, is used to simulate the attention shifting process. We show a prototype image viewer developed for Pocket PC and conduct some evaluations to demonstrate the effectiveness of our approach. 1.
Collaborative Proxy System for Distributed Web Content Transcoding
- In Proceedings of the 9th ACM International Conference on Information and Knowledge Management, November 2000. Rate (%) Rate (%) SBR SDR Number of Users (b) SBR/SDR SBR SDR 1 1.1 1.2 Zipf Parameter 1.3 1.4 (b) SBR/SDR
, 2000
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On Balancing between Transcoding Overhead and Spatial Consumption in Content Adaptation
- Proc. Mobicom 2002, ACM
, 2002
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