A study on modality conversion for content adaptation

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The explosive growth of the Internet brings about the diversity and heterogeneity of digital contents, terminals and network connections. Content adaptation currently appears to be the key solution to support the quality of service (QoS) for multimedia services over heterogeneous environments. In this trend, rich multimedia contents are adapted to meet various constraints of terminals, network connections, and user preferences. In this thesis, we study modality conversion as an important adaptation method. We extend the traditional formulation of content adaptation to effectively support modality conversion. Two main challenging issues of this extended formulation are: 1) the quantification of the content value when contents are drastically scaled and/or converted to other modalities, and 2) the method to accurately decide the modality and the content value for each object given that quantification. For the first issue, by extending the concept of utility function in content scaling, we propose the overlapped content value (OCV) model to represent the dependence of content value on resource and modalities. To build realistic OCV model, we evaluate cross-modality quality (or content value). In this context, we point out two important aspects of content value: the perceptual quality and the semantic quality. We present a subjective method to evaluate the content value of a content which may be drastically scaled or converted to different modalities. For the specific case of video and image modalities, we discuss some computational methods to replace the time-consuming subjective evaluation. Further, we investigate multi-modality quality from semantic perspective. Based on the theory of conceptual graphs, we propose an analytical framework to evaluate the semantic quality for multimedia adaptation and communication. The general formulation is then applied to the popular audiovisual streaming service. As quality is very subjective, we propose a modality con...
Advisors
Ro, Yong-Manresearcher노용만researcher
Description
한국정보통신대학교 : 공학부,
Publisher
한국정보통신대학교
Issue Date
2006
Identifier
392598/225023 / 020015338
Language
eng
Description

학위논문(박사) - 한국정보통신대학교 : 공학부, 2006, [ x, 113 p. ]

Keywords

Content Adaptation; Modality Conversion

URI
http://hdl.handle.net/10203/54563
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=392598&flag=dissertation
Appears in Collection
School of Engineering-Theses_Ph.D(공학부 박사논문)
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