CMSC636: Data Visualization Construction

Author: Don Miner
Class: CMSC636 with Dr. Rheingans
Project Description

Visualizations of Head Data

Marching Cubes

Marching cubes with a parameter of 250 and some transparency.

Volume Rendering

A ray cast with a very high opacity. This shows the surface of the volume well. Doesn't he look a little like John McCain?

Very low density values are completely transparent (0 opacity) while the rest of the volume is .2 opacity. The color gradient varies from green (low density) to red (high density).

Gradient/Density Thresholding

Only have opacity if the gradient is greater than 100. Red areas are more dense.

Only have opacity if the gradient is greater than 250. Red areas are more dense.

Threshold the max and min density values of the brain so that everything else is 0 opacity. Unfortunately, there is a lot of stuff in the head that is the same density as the brain.

Visualizations of Kidney Data

Demonstrating Density

This shows the varying density of the kidneys an the spine. More dense objects in this image also have higher opacity. Notice how the inside of the spine is green because it is less dense.

Displaying the Kidneys

Display the spine with a gradient threshold (left) and with density value thresholding (middle and right).

Display the kidneys by thresholding the density values that are opaque. Some of the veins and spine have similar density as the kidneys, though.

By setting the opacity thresholds so that it only shows the kidneys and the spine, I get this image.