???? ?? ? ?? (graduate course) - PowerPoint PPT Presentation

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???? ?? ? ?? (graduate course)

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Title: Author: Bong-Soo Sohn Last modified by: Bong-Soo Sohn Created Date: 1/26/2006 6:32:23 PM Document presentation format – PowerPoint PPT presentation

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Title: ???? ?? ? ?? (graduate course)


1
???? ?? ? ??(graduate course)
  • Bong-Soo Sohn
  • School of Computer Science and Engineering
  • Chung-Ang University

2
Course Overview
  • Level CSE graduate course
  • ?? ??. ?? ?? ?? ?? ?? ? handout ??
  • ????
  • ????? ???? ?? ? ????? ?? ?? ?? ? ??
  • ????? ?? ?? ?? ? ?? ??? ??? ?? ? ??
  • ? ????? CT? MRI? ?? ??? ?? ??? ?? ???? ??? ?? ???
    ???? ???? ? ??? ???? ??? ??/??/????? ?? ??? ???
    ????. ?? Voronoi Diagram, Delaunay Triangulation
    ?? ?? ???? ???? ? ????? ???.

3
Topics
  • Volume Visualization and Applications of
    Computational Geometry
  • Scalar Visualization Techniques
  • Volume Rendering
  • Isocontouring
  • Quantitative Visualization
  • Contour spectrum
  • Contour Tree
  • Automatic Generation of Color Opacity Map
  • Vector (Flow) Visualization
  • Image Based Geometric Modeling (Mesh Generation)
  • Computational Geometry Data Structures Voronoi
    Diagram Delaunay Triangulation

4
Volumetric Image Processing and Graphics
  • Graphics / Image Processing
  • Biomedical Applications

Filtering, Segmentation
CT/MRI
Electron Microscopy
Geometric Modeling
3D/4D Image
Processing
OCT
Visualization (Rendering)
Ultrasound
Quantification (Structure Analysis)
5
Input Biomedical Images
  • Rapid Advance of Imaging Techniques
  • Multiscale
  • Static(3D) vs time-varying(4D)

X-ray Crystallography
Electron Microscopy
OCT (Optical Coherence Tomography)
CT/MRI
Cryo-EM
Cellular and Tissue Level (Nano Scale)
Molecular Level (Angstrom Scale)
Organ Level (Micro Scale)
Organ Level
6
Course Information
  • ?? ? 7,8,9 ??
  • Class webpage http//cau.ac.kr/bongbong/grad10
  • ???? ??
  • ??? 208-501
  • Email bongbong_at_cau.ac.kr
  • Office Tel 820-5843
  • ???? ? 4pm-5pm ?? ?? ?????

7
Schedule
  • Visualization Basics (1?)
  • Scalar Visualization Techniques (3?)
  • Isosurface Extraction
  • Marching Cubes
  • topology problem
  • Accelerated method
  • Volume Rendering
  • Ray casting
  • HW accelerated volume rendering

8
Schedule
  • Quantitative Visualization (2?)
  • Contour Tree
  • Automatic Generation of Transfer Function
  • Vector Field Visualization(1-2?)
  • Applications of Computational Geometry (2?)
  • Mesh generation
  • Voronoi Diagram
  • Delaunay Triangulation

9
Schedule
  • Special Topics (4-5?)
  • Pattern recognition in volume visualization
  • Contour Tree Visualization
  • 3D Image Processing
  • Segmentation
  • Filtering
  • Perception in Visualization
  • Medical Visualization

10
Volume Graphics
  • 3D World is modeled with a function ( image)
  • F(x,y,z) (e.g. CT human body density)
  • Surface is modeled with a level set of a function
  • level set isosurface isocontour implicit
    surface
  • (x,y,z) F(x,y,z) w ( w is a fixed value,
    called isovalue )
  • Level set may represent important features of a
    function
  • e.g. skin surface (wskin density)
  • or bone surface (wbone density) in body CT

11
Example (Volume Rendering, Isosurface)
Level Set F(x,y,z) w
w skin density
skin surface
w bone density
volume image
F(x,y,z)
bone surface
12
Image Based Geometric Modeling
( Computer Methods in Applied Mechanics and
Engineering SCI, 2005 )
  • Contribution
  • Property
  • Image Based Geometric Model
  • Multiresolution, Adaptive Tetrahedral Mesh
  • Quality Mesh
  • Feature Preservation

Volumetric Image
Quality Tetrahedral Mesh Model
13
Cardiovascular Modeling
  • Research Pipeline

Rendering, Quantitative Visualization
Simulation
3D Image Acquisition
Geometric Modeling
cardivascular disease research, medical device
design, and surgical planning
14
Rendering Interactive VolVideo
( Computer Vision and Image Understanding SCI,
2004 )
  • Contribution 3D Video
  • Interactive Rendering of Large Time-Varying 3D
    Images
  • Compression for time-varying volume isosurface
    (4D 3D X 1D)
  • Interactive playback of volume and isosurface
    (Graphics Hardware)
  • Design of Interactive Volumetric Video System

Raw Volumetric Video
User Interaction
Rendered Image
isovalues , Viewing direction, Color and opacity
maps Time frames
Graphics HW (2D/3D Texture)
Volume Encoder
3D Video Stream
Volume Decoder
Network
Video Server
Interactive Browser
15
Analysis Quantitative Visualization
( IEEE Transactions on Visualization and Computer
Graphics SCI, 2006 )
  • Contribution
  • Automatic Structure Computation of Static and
    Time-Varying 3D Images
  • Contour Trees
  • Structure (topology) of Level Sets
  • Level set component segmentation
  • Seed set generation for fast extraction
  • Extend benefits of Contour Trees to time-varying
    volume.

Ethanol CH3CH2OH
16
Example Hemoglobin Dynamics
( IEEE Transactions on Visualization and Computer
Graphics SCI, 2006 )
(c) Level Set Segment
(a) Vol Ren
(b) Contour Tree
Time Extension
17
Biomedical OCT Visualization
( Journal of Korean Physical Society SCI, 2007 )
  • OCT(Optical Coherence Tomography)
  • Non-invasive optical tomographic imaging
    technique with micrometer scale resolution.
  • Widely accepted in biomedical applications
  • Contribution
  • Real-time volume visualization of 3-dimensional
    OCT images.

3D Volume Visualization
18
Non-Photorealistic Volume Rendering
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