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Volume Graphics (lecture 6 : Transfer Fucntion) slides knowledgement : G. Kindlmann

Volume Graphics (lecture 6 : Transfer Fucntion) slides knowledgement : G. Kindlmann. Bong-Soo Sohn School of Computer Science and Engineering Chung-Ang University. Transfer Function. Transfer functions make volume data visible by mapping data values to optical properties. volume data.

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Volume Graphics (lecture 6 : Transfer Fucntion) slides knowledgement : G. Kindlmann

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  1. Volume Graphics(lecture 6 : Transfer Fucntion)slides knowledgement : G. Kindlmann Bong-Soo Sohn School of Computer Science and Engineering Chung-Ang University

  2. Transfer Function Transfer functions make volume data visible by mapping data values to optical properties volume data

  3. Transfer Function

  4. Optical Properties • Anything that can be composited with a standard graphics operator (“over”) • Opacity: “opacity functions” • Most important • Color • Can help distinguish features • Emittance • Why don’t we use this more often? • Phong parameters (ka, kd, ks) • Index of refraction

  5. Volume rendering with different transfer function • Setting transfer function is difficult, unintuitive, and slow

  6. Goal • Make good renderings easier to come by • Make space of TFs less confusing • Remove excess “flexibility” • Provide one or more of: • Information • Guidance • Semi-automation • Automation

  7. Semi-automatic generation of TF edges

  8. Scatter plot

  9. Analysis

  10. Distance Map

  11. Whole Process

  12. Result : CT Head

  13. Result

  14. Multidimensional Transfer Fucntion

  15. 1D vs 2D histogram

  16. Volume rendering using 2D transfer function

  17. Multidimensional transfer function

  18. Multivariate Imaging Data

  19. Interaction Tools • Data Probe • Clipping plane • Classification Widget • Triangle • rectangle

  20. Dual Domain Interaction

  21. Results

  22. Results

  23. Results

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