OSU CS 553 - Directly Visualizing Volume Data (16 pages)

Previewing pages 1, 2, 3, 4, 5 of 16 page document View the full content.
View Full Document

Directly Visualizing Volume Data



Previewing pages 1, 2, 3, 4, 5 of actual document.

View the full content.
View Full Document
View Full Document

Directly Visualizing Volume Data

67 views

Other


Pages:
16
School:
Oregon State University
Course:
Cs 553 - Scientific Visualization

Unformatted text preview:

Directly Visualizing Volume Data Mike Bailey mjb cs oregonstate edu Oregon State University Oregon State University Computer Graphics mjb May 14 2013 Volume Data A Definition A volume is a 3D discretely sampled data set where the size of the voxels have been expanded to occupy the space to the neighboring voxels Oregon State University Computer Graphics mjb May 14 2013 1 Why Do We Care About Volume Visualization Medical CAT MRI 3D ultrasound Science and engineering g g CFD stress thermal molecular Volumes are normally very difficult to comprehend Oregon State University Computer Graphics mjb May 14 2013 Understanding Volume Data Usually Involves a Compromise Point Clouds Interpolated colors cutting planes Contours cutting plane Isosurfaces All values everywhere hard to see very much distracting artifacts All values in a single plane Discrete values in a single plane A single value everywhere Because of these compromises these are all considered to be indirect ways to visualize volume data Oregon State University Computer Graphics mjb May 14 2013 2 Direct Volume Rendering Composite the colors and alphas of the voxels A Volume Element or voxel Oregon State University Computer Graphics mjb May 14 2013 Transfer Function Colors Frequency Histogram usually a log scale Opacity OSU vx Transfer Function Sculpting Window Oregon State University Computer Graphics mjb May 14 2013 3 Voxel Compositing Recall this color blending equation from the OpenGL Transparency notes C C new 1 C old In Voxel World things work the same way Cold Cnew C Oregon State University Computer Graphics mjb May 14 2013 Voxel Compositing Example R G B 0 1 1 TMIN 0 TMAX 100 The color transfer function is a Black RedYellow White heated object scale mapping a scalar value of 0 to Black and 100 to White The opacity transfer function is a linear ramp so that the opacity is 1 opaque when T 100 and 0 transparent when T 0 T 33 33 R G B You are compositing back to front through the volume At this moment the



View Full Document

Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Directly Visualizing Volume Data and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Directly Visualizing Volume Data and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?