• Paper Page
• .PDF

Increasingly, more importance is placed on the uncertainty information of data being displayed. This paper focuses on techniques for visualizing 3D scalar data sets with corresponding uncertainty information at each point which is also represented as a scalar value. In Djurcilov (in: D. Ebert, J.M. Favre, R. Peikert (Eds.), Data Visualization 2001, Springer, Berlin, 2001), we presented two general methods (inline DVR approach and a post-processing approach) for carrying out this task. The first method involves incorporating the uncertainty information directly into the volume rendering equation. The second method involves post-processing information of volume rendered images to composite uncertainty information. Here, we provide further improvements to those techniques primarily by showing the depth cues for the uncertainty, and also better transfer function selections.

This paper presents the same methods as "Volume Rendering Data with Uncertainty Information" with the addition of depth-cues when rendering with holes. Specifically, uncertainty is expressed in volume rendering via two approaches, inline and post-processing. The inline approach maps uncertainty to opacity, and the original data values to color, thus incorporating uncertainty into the volume rendering equation. The post-processing approach uses discontinuities to express uncertainty. These discontinuities can of the form of speckles or holes with or without depth-cues (i.e. fog) to indicated location; noise; and texture.

Uncertainty representations; Ocean modeling; Volume rendering; Transfer function; Speckle; Noise; Textures

Color and opacity mapping, discontinuity via adding speckles/holes with depth cues to indicate location in the volume, adding noise, and adding texture mapping by varying texture contrast with uncertainty.

@Article{	djurcilov:2002:VSVU,
author =	"Suzana Djurcilov and Kwansik Kim and Pierre Lermusiaux and Alex Pang",
title =	"Visualizing Scalar Volumetric Data with Uncertainty",
journal =	"Computers and Graphics",
volume =	"26",
pages =	"239--248",
year =	"2002",
}