| OCR Text |
Show 43 the idea of coherence for a static viewpoint and cache this information to modify rendering parameters to focus on the regions of interest. We recognize the data dependency of structures in the volume data and use this along with the technique of "region growing" to generate matte volumes and enhance them. Interactive techniques for generating matte volumes use the concept of planting a "seed" to specify a region of interest and incorporate it with region growing to sprout "seedlings" in real time. Caching of coherent data for achieving close to real time rendering speed, run length encoding of the volume rendering samples to decrease the memory requirements, using multimodal approach for navigating through the complex volume data-sets, and utilizing the data dependency of structures in theregion growing process to enhance automatically regions of interest are the highlights of this thesis work. We have taken these concepts and provided the scientist with tools to focus on regions of interest and generate visualizations of 3D scalar field data. The isosurface renderer and slicer provide tools for a quick, interactive, and coarse view of the data. The Slicer /Isosurface combination is used as an innovative way of navigating through the volume and positioning the cursor at the regions of interest. The volume renderer in conjunction with matte volumes like volume seeds, seedlings, cookie cutters, auxiliary volumes, and a variety of priority functions for seedling growth enables the visualizer to extract the regions of interest from the complex data. The opacity and color maps are used to change the opacity and color voxels. By caching the map independent information and using the information obtained by interactively exploring the isosurface we can render and interactively rerender the high resolution volume image at various opacity and color maps. The region growing process is also interactive because it also uses the cached information. Thus we have presented a system which can be a base for a comprehensive volume exploration and visualization system. |
