Modelling of Clouds from a Hemispherical Image
No Thumbnail Available
Date
2014
Journal Title
Journal ISSN
Volume Title
Publisher
The Eurographics Association
Abstract
This paper presents an image-based method for modelling clouds. Unlike previous image-based approaches, a hemispherical photograph is used as input, enabling to consider an entire sky instead of merely a portion. Our method computes the intensity and opacity of the clouds from the photograph. For this purpose, beforehand, the sun illumination is filtered, the pixels are classified between cloud and sky pixels, and the sky behind the clouds is reconstructed. After having been smoothed, the intensity of the clouds is used to create vertices on a hemisphere, and their radius coordinate is modulated by the intensity value of the corresponding pixel. Finally, the mesh is generated by triangulation of the vertices. Additionally, the use of the opacity of the clouds to simulate their transparency and render them is proposed. The results show that our method can be used to produce a realistic full sky populated with clouds in a very straightforward way for the user.
Description
@inproceedings{10.2312:cgvc.20141202,
booktitle = {Computer Graphics and Visual Computing (CGVC)},
editor = {Rita Borgo and Wen Tang},
title = {{Modelling of Clouds from a Hemispherical Image}},
author = {Alldieck, Thiemo and Lundtoft, Dennis H. and Montanari, Niels and Nikolov, Ivan and Vlaykov, Iskren G. and Madsen, Claus B.},
year = {2014},
publisher = {The Eurographics Association},
ISBN = {978-3-905674-70-5},
DOI = {10.2312/cgvc.20141202}
}