Interactive Rendering and Image Segmentation (IRIS)

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Interactive Rendering and Image Segmentation
(IRIS)
David Gregg Eric Larsen Arun Neelamkavil Sanjay
Sthapit William Wynn
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What is image segmentation?

• The process of outlining the shape of structures
  visible in an image.
• A volumetric data set can be thought of as a set
  of parallel 2D images
• One performs 3-D image segmentation by
  segmenting in all of these parallel images.
• The resulting outlines can be stacked to
  approximate the 3D-shape of the structure.

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What does IRIS provide?

• An easy to use image segmentation tool
• Interactive performance
• Portable and extendible
• Traditional slice-based segmentation
• Produces a 3D rendering of the segmentation
• Allows sub-segmentation on the 3D rendering

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Challenges Technical Problems

• Building a product from scratch
• Ensuring that IRIS is Portable and Extendible
• Deciding what software to use, learning about it
  and adapting our design to accommodate the
  software

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• 3D interaction
• - Painting in 3D
• - Client wasnt sure what he wanted
• Accuracy of
• - 2-D rasterization
• - 3-D ray generation and intersection with a
  Voxel
• based representation of the segmented data

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• Overlaying transparent segmentation data
• Multiple window management
• Event Handling
• Managing state variables
• Consistency of window displays

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Demo ..
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Our Successes

• We have met all of the contracts primary
  requirements
• Allowing segmentation in all 4 windows
• Same code compiles and runs on PCs, SGIs and Suns

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• Linked cursors which enable the user to see
  visually how the different windows are
  interrelated
• Labeling in a window is reflected in the other
  windows
• 3-D point selection - intuitive and accurate
  selection of points (based on the users view of
  the segmentation data)

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To Do

• Immediate
• line selection in the 3D window
• tying up loose ends - removing any hard coded
  parameters
• full system test
• cleaning up documentation

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• Future Projects
• allowing for varied file formats - DICOM/GIPL
• painting geodesic curves and surfaces

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Acknowledgements

• Stephen Aylward
• Joe Capowski
• Kenny Hoff
• Graham Gash