タケシマ　ユリコ   竹島　由里子    所属   メディア学部 メディア学科    職種   教授
言語種別	英語
発行・発表の年月	2017/02
形態種別	国際会議論文
標題	Parameter-Setting for Topology-Accentuated Transfer Functions for Volume Raycasting
執筆形態	共著
掲載誌名	Proc. Topology-Based Methods in Visualization 2017
掲載区分	国外
出版社・発行元	Topology-Based Methods in Visualization 2017
著者・共著者	Yuriko Takeshima, Shigeo Takahashi, Issei Fujishiro
概要	The design of automatic transfer functions for volume rendering is a perennial problem in volume visualization. For the last two decades, a variety of design methodologies has been proposed. However, sensitive adjustment of related control parameters remains entrusted to users, because rendering conditions such as the size of a target dataset and sampling distance of ray casting differ on a case-by-case basis. Our group proposed one-dimensional transfer functions to accentuate topological changes in the scalar field of the target dataset. However, the method forces us to determine the actual control parameter values for the transfer functions in an empirical manner. In this extended abstract, we propose a supplementary mechanism to judiciously define an appropriate profile of opacity values. In our approach, the height and width of the hat functions to accentuate feature isosurfaces are determined according to the number of voxels belonging to the relevant topologically equivalent scalar field interval. The feasibility of the proposed method is evaluated by application to three kinds of volume dataset.