Shadow and sky color rendering technique in augmented reality environments

Realistic rendering technique of outdoor Augmented Reality (AR) has been an attractive topic since last two decades due to the large number of publications in computer graphics. Realistic virtual objects in outdoor rendering AR systems require sophisticated effects such as shadows, daylight and inte...

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Main Author:	Kolivand, Hoshang
Format:	Thesis
Language:	English
Published:	2013
Subjects:	QA75 Electronic computers Computer science
Online Access:	http://eprints.utm.my/id/eprint/33836/1/HoshangKolivandPFSKSM2013.pdf
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id	my-utm-ep.33836
record_format	uketd_dc
spelling	my-utm-ep.338362017-09-19T04:20:08Z Shadow and sky color rendering technique in augmented reality environments 2013 Kolivand, Hoshang QA75 Electronic computers. Computer science Realistic rendering technique of outdoor Augmented Reality (AR) has been an attractive topic since last two decades due to the large number of publications in computer graphics. Realistic virtual objects in outdoor rendering AR systems require sophisticated effects such as shadows, daylight and interaction between skycolor and virtual as well as real objects. A few realistic rendering techniques have been proposed to overcome this issue most of which are related to non real-time rendering. However, this problem still persists especially in outdoor rendering. This research proposed a new technique to achieve realistic real-time outdoor rendering taking into account the interaction between sky color and objects in AR systems with respect to shadows in any specific location, date and time. This approach involved four main phases, which cover different outdoor AR rendering requirements. In the first phase, sky color was generated with respect to the sun position. The second phase involved the shadow generation algorithm which is called Hybrid Shadow Mapping (HSM). During this phase some improvements in shadow volume and projection shadow are employed. The third phase started with the introduction of a coherent formula for the sun position and shadows in any specific location, date and time. The coherent formula aims to find the shadow positioning automatically. This phase also addressed the interaction between sky color and objects in virtual environments. Finally, a technique to integrate sky color and shadows through the effects of sky color on virtual objects in the AR system is proposed. The experimental results reveal that the proposed technique has significantly improved the realism of real-time outdoor AR rendering thus solving the problem of realistic AR systems. 2013 Thesis http://eprints.utm.my/id/eprint/33836/ http://eprints.utm.my/id/eprint/33836/1/HoshangKolivandPFSKSM2013.pdf application/pdf en public phd doctoral Universiti Teknologi Malaysia, Faculty of Computing Faculty of Computing
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QA75 Electronic computers Computer science
spellingShingle	QA75 Electronic computers Computer science Kolivand, Hoshang Shadow and sky color rendering technique in augmented reality environments
description	Realistic rendering technique of outdoor Augmented Reality (AR) has been an attractive topic since last two decades due to the large number of publications in computer graphics. Realistic virtual objects in outdoor rendering AR systems require sophisticated effects such as shadows, daylight and interaction between skycolor and virtual as well as real objects. A few realistic rendering techniques have been proposed to overcome this issue most of which are related to non real-time rendering. However, this problem still persists especially in outdoor rendering. This research proposed a new technique to achieve realistic real-time outdoor rendering taking into account the interaction between sky color and objects in AR systems with respect to shadows in any specific location, date and time. This approach involved four main phases, which cover different outdoor AR rendering requirements. In the first phase, sky color was generated with respect to the sun position. The second phase involved the shadow generation algorithm which is called Hybrid Shadow Mapping (HSM). During this phase some improvements in shadow volume and projection shadow are employed. The third phase started with the introduction of a coherent formula for the sun position and shadows in any specific location, date and time. The coherent formula aims to find the shadow positioning automatically. This phase also addressed the interaction between sky color and objects in virtual environments. Finally, a technique to integrate sky color and shadows through the effects of sky color on virtual objects in the AR system is proposed. The experimental results reveal that the proposed technique has significantly improved the realism of real-time outdoor AR rendering thus solving the problem of realistic AR systems.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Kolivand, Hoshang
author_facet	Kolivand, Hoshang
author_sort	Kolivand, Hoshang
title	Shadow and sky color rendering technique in augmented reality environments
title_short	Shadow and sky color rendering technique in augmented reality environments
title_full	Shadow and sky color rendering technique in augmented reality environments
title_fullStr	Shadow and sky color rendering technique in augmented reality environments
title_full_unstemmed	Shadow and sky color rendering technique in augmented reality environments
title_sort	shadow and sky color rendering technique in augmented reality environments
granting_institution	Universiti Teknologi Malaysia, Faculty of Computing
granting_department	Faculty of Computing
publishDate	2013
url	http://eprints.utm.my/id/eprint/33836/1/HoshangKolivandPFSKSM2013.pdf
_version_	1747816197058985984

Shadow and sky color rendering technique in augmented reality environments

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