1. Illustrative Clipping of Volume Data
Åsmund Birkeland
Stefan Bruckner
Andrea Brambailla
Ivan Viola
Cagatay Turkay
Julius Parulek
Name Åsmund Birkeland
Talk about a new approach for augmented slice rendering
Collaboration between UiB and TU Vienna
University of Bergen, Norway
TU Vienna, Austria

2. Overview
UoB
Clipping Membrane for Volume Visualization
Sketch Based Segmentation using Physics

3. Interactive Visual Analysis (IVA) of Biological Data
Gene Expression Datasets
Molecular Surfaces & Cavities
Molecular Dynamics Simulations

4. Clipping Membrane - Motivation
Occlusion and context 3D structures
Clipping - Indiscriminately cuts through structures
Clipping used by Illustrators - Selectively chose where to cut
In medical imaging, 2D slice rendering is one of the most common tools for examening 3D data
Slice the data in an arbitrary direction and display it as a 2D image with little or no context.
3D rendering shows more the global context, yet the details are lost by clutter from un interesting structures
How about having a slice with 3D rendering added to the image of structures close to the plane?
David S. Goodsell, Machinery of Life

5. Clipping Membrane - Methodology
Elastic membrane wrapping around structures
Physics based approach
Need a way to define the local context
So we think how can we define this with no adittional semantic information (segmentation)
Use physics
Translate into physics problem
We have a data set, for instance a scalar field type CT
for each data element We take the data properties, in our case the scalar values and map it inot a an attractive or repulsive force (force kernel).
To give the user a controlling mechanism we utilize the transfer function concept
Combined force kernels create a potential field

6. Clipping Membrane - Methodology

7. Clipping Membrane

8. Application Areas – Medical Data

9. Application Areas - Seismic Data

10. Application Areas – Biological Data

11. Clipping Membrane - Video

12. Sketch Based Segmentation
Rapid segmentation of larger structures in ultrasound
Handle any kind of sketch input
Points
Lines
Contours
Use deformable model – Soft body
Distribute attractors at the sketch

13. Sketch Based Segmantation - Video

14. Thank you for listening - Questions?