Time-cosrie visual content analysis for low vision users and MPEG-21 application

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There is a reduction in the visual adaptation rate to changing light intensities due to age. Recent research has shown that the number of older people affected with visual impairments causing low vision keeps growing. It has also been established that older adults have difficult seeing under low illumination and at night. Whilst notable eye diseases such as macular degeneration and glaucoma account for a larger percentage for causing visual impairments amongst the old, there has been an increase in people becoming visually impaired even in the absence of ocular diseases. The major effect on the aspect of multimedia processing is that they cannot have the full and enjoyable access to the multimedia and other digital contents that are available on conventional devices such as PCs, PDAs or even mobile phones. This document presents a tone mapping model that presents accurate simulations of temporal visual processing at different ages, and goes further to give a roadmap for adaptation of digital contents in MPEG-21 multimedia environment. Our approach in this research culminates from Pattanaik’s tone-mapping model by making extensions to temporal visual filtering with the help of decay functions, thereby simulating a reduction of visual response which comes with age. Our filtering model paves way and lays a foundation for future research to develop a more effective adaptation model that may further be used in developing visual content adaptation aids, and guidelines in MPEG 21 environment. We demonstrate our visual model using a High Dynamic Range image and the experiment results are in conversant with the psychophysical data from previous vision researches. We also present a visual adaptation model for the older population at specific ages. The first part of this thesis document presents accurate perceptually-based visual simulations of High Dynamic Range images and the effect that age has on the temporal visual adaptation rate to various luminance intensities ...
Advisors
Ro, Yong-Manresearcher노용만researcher
Description
한국정보통신대학교 : 공학부,
Publisher
한국정보통신대학교
Issue Date
2007
Identifier
392860/225023 / 020054696
Language
eng
Description

학위논문(석사) - 한국정보통신대학교 : 공학부, 2007.8, [ vi, 53 p. ]

Keywords

adaptation; MPEG-21 DIA; low-vision; perceptual simulation

URI
http://hdl.handle.net/10203/54880
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=392860&flag=dissertation
Appears in Collection
School of Engineering-Theses_Master(공학부 석사논문)
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