Automatic Generation of Volumetric Transfer Functions

For high quality 3D volume renderings transfer functions have be defined. Typically 1D transfer functions are used that assign a color and an alpha value to every intensity value of the volume data. The choice of transfer functions often is quite difficult and users have to go through a trial and error approach to obtain “good” visualizations. 2D transfer functions use the gradient of the volume data as additional dimension to assign colors and alpha values. In this paper the new features of the ImageJ Volume Viewer plugin will be presented, among others it will be possible to get automatic proposals for 1D or 2D transfer functions that will lead to pleasing volume renderings. These transfer functions serve as a starting point but they still can be modified to change the way the volume data is rendered.

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