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Issue No. 02 - February (2011 vol. 17)
ISSN: 1077-2626
pp: 171-181
Yu-Shuen Wang , National Cheng Kung University, Tainan
Chaoli Wang , Michigan Technological University, Houghton
Tong-Yee Lee , National Cheng Kung University, Tainan
Kwan-Liu Ma , University of California, Davis, Davis
The growing sizes of volumetric data sets pose a great challenge for interactive visualization. In this paper, we present a feature-preserving data reduction and focus+context visualization method based on transfer function driven, continuous voxel repositioning and resampling techniques. Rendering reduced data can enhance interactivity. Focus+context visualization can show details of selected features in context on display devices with limited resolution. Our method utilizes the input transfer function to assign importance values to regularly partitioned regions of the volume data. According to user interaction, it can then magnify regions corresponding to the features of interest while compressing the rest by deforming the 3D mesh. The level of data reduction achieved is significant enough to improve overall efficiency. By using continuous deformation, our method avoids the need to smooth the transition between low and high-resolution regions as often required by multiresolution methods. Furthermore, it is particularly attractive for focus+context visualization of multiple features. We demonstrate the effectiveness and efficiency of our method with several volume data sets from medical applications and scientific simulations.
Data reduction, focus+context visualization, interactive visualization, mesh deformation, transfer functions, volume rendering.

K. Ma, Y. Wang, C. Wang and T. Lee, "Feature-Preserving Volume Data Reduction and Focus+Context Visualization," in IEEE Transactions on Visualization & Computer Graphics, vol. 17, no. , pp. 171-181, 2010.
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