Multiresolution volume visualization with a texture-based octree

Boada I., Navazo I., Scopigno R.

:Informàtica::Infografia [Àrees temàtiques de la UPC]  Multiresolution representation and rendering  Infografia tridimensional  3D Texture mapping  Multiresolution represen- tation and rendering  Computer Vision and Pattern Recognition  Octree  Software  Computer Graphics and Computer-Aided Design  Three-dimensional imaging  Volume rendering 

Although 3D texture-based volume rendering guarantees image quality almost interactively, it is difficult to maintain an interactive rate when the technique has to be exploited on large datasets. In this paper, we propose a new texture memory representation and a management policy that substitute the classical one-texel per voxel approach for a hierarchical approach. The hier- archical approach benefits nearly homogeneous regions and regions of lower interest. The proposed algorithm is based on a simple traversal of the octree representation of the volume data. Driven by a user-defined image quality, defined as a combination of data homogeneity and importance, a set of octree nodes (the cut) is selected to be rendered. The degree of accuracy applied for the representation of each one of the nodes of the cut in the texture memory is set independently according to the user-defined parameters.The variable resolution texture model obtained reduces the texture memory size and thus texture swapping, improving rendering speed.

Source: The visual computer 17 (2001): 185–197. doi:10.1007/PL00013406

Publisher: Springer., Heidelberg , Germania

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