Interactive Transfer Function Design Based on Editing Direct Volume Rendered Images

Yingcai Wu¹     Huamin Qu^2
1Microsoft Research Asia      ²Hong Kong University of Science and Technology

Experiment on a CT carp data set. (a) Source image 1. (b) Source image 2. (c) Source image 3 with a user-selected feature indicated by a rectangle. (d) Target image obtained by fusing features in (a) with 0.3 scores, features in (b) with 0.4 scores and the user-selected feature in (c) with 0.3 scores.

Direct volume rendered images (DVRIs) have been widely used to reveal structures in volumetric data. However, DVRIs generated by many volume visualization techniques can only partially satisfy users' demands. In this paper, we propose a framework for editing DVRIs, which can also be used for interactive transfer function (TF) design. Our approach allows users to fuse multiple features in distinct DVRIs into a comprehensive one, to blend two DVRIs, and/or to delete features in a DVRI. We further present how these editing operations can generate smooth animations for focus + context visualization. Experimental results on some real volumetric data demonstrate the effectiveness of our method.

@article {YWu2007a,
author = {Yingcai Wu and Huamin Qu},
title = {Interactive Transfer Function Design Based on Editing Direct Volume Rendered Images} ,
journal = {IEEE Transactions on Visualization and Computer Graphics},
year = {2007},
volume = {13},
number = {5},
pages = {1027--1040 }
}

The authors would like to thank the anonymous reviewers for their valuable comments and thank Hong Zhou and Ming-Yuen Chan for their help.