Preprocessing
The following Preprocessing operations are available in 3dviewnix:
- Volume-of-Interest
- To specify subset of the n-dimensional (nD) volume image
- To specify an intensity-interval-of-interest for reducing the number of bits
- Interpolation
- To create isotropically sampled data of lower or higher resolution than input
- Many interpolating functions
- Interpolation in n dimensions
- Both grey-level and shape-based methods
- Filtering
- A variety of forms of enhancing and smoothing filters and distance maps
- Used for filtering surfaces, for normal estimation, for interpolation, and volume rendering
- Masking
- For assisting segmentation
- Quick operation using "paint brushes"
- Thresholding
- Multiple intervals can be specified
- Iso-surface generation at any resolution
- Segementation
- 2-feature cluster partitioning
- Quick gesture-controlled (user-guided) boundary segmentation
- Classification
- 1-feature multiple material classification for opacity assignment
- 2-feature single material classification for opacity assignment
- Classification based on fuzzy connectivity
- Boundary Formation
- Connected, oriented, closed 3D surfaces are formed
- Surfaces may have any resolution
- Image Algebra
- Image addition, subtraction, multiplication, division, logical operations
- Regisration
- Based on similar density values in volume images
- Based on matching homologous features - points, curves, entire surfaces
- For merging information from multiple modalities
- For motion description and analysis
Medical Image Processing Group, Department of Radiology, University of Pennsylvania Health System