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An Enhanced Splatting Method

An Enhanced Splatting Method. Peter Kulka & Richard Lobb. Graphics and Visualization Group Department of Computer Science The University of Auckland. Overview. Direct volume rendering High resolution splatting Results Conclusions and future work. Direct volume rendering.

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An Enhanced Splatting Method

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  1. An Enhanced Splatting Method Peter Kulka & Richard Lobb Graphics and Visualization Group Department of Computer Science The University of Auckland

  2. Overview • Direct volume rendering • High resolution splatting • Results • Conclusions and future work ACSC’99 - An enhanced splatting method - Peter Kulka & Richard Lobb

  3. Direct volume rendering • Research area within visualization • Rendering of 3D volume data sets • Volume reconstruction • Calculating an illumination model • Two classes of algorithms: • Ray casting • Projection methods (splatting) ACSC’99 - An enhanced splatting method - Peter Kulka & Richard Lobb

  4. Volume reconstruction • Problem: • Finding values between sample points ACSC’99 - An enhanced splatting method - Peter Kulka & Richard Lobb

  5. Illumination models • Assigning optical properties to the volume • Emission-absorption model: • Volumes consist of light emitting particles • Particles also attenuate light from behind them • Such a system can be described by: ACSC’99 - An enhanced splatting method - Peter Kulka & Richard Lobb

  6. Ray casting • Image order method • Simulation of light flow along viewing rays • Sharp images ACSC’99 - An enhanced splatting method - Peter Kulka & Richard Lobb

  7. Splatting • Object order method • Projection of each volume element onto the view plane • Fast ACSC’99 - An enhanced splatting method - Peter Kulka & Richard Lobb

  8. Motivation • Want: • Rendering speed of splatting • Image quality of ray casting • Approach: • Correct errors in splatting • Leads to three separate modifications • Result: sharper images • We call this method high resolution splatting ACSC’99 - An enhanced splatting method - Peter Kulka & Richard Lobb

  9. Modifications to standard splatting • Reordering reconstruction and illumination calculations • Correcting view angle distortions ACSC’99 - An enhanced splatting method - Peter Kulka & Richard Lobb

  10. Modifications (cont.) • Slicing the reconstruction kernel ACSC’99 - An enhanced splatting method - Peter Kulka & Richard Lobb

  11. High resolution splatting • Summary: ACSC’99 - An enhanced splatting method - Peter Kulka & Richard Lobb

  12. Comparison • Test data set: CT scan of a human pelvis • Size: 256  256  110 sample points ACSC’99 - An enhanced splatting method - Peter Kulka & Richard Lobb

  13. ray casting splatting high resolution splatting Results • Various rendering methods (close-up): ACSC’99 - An enhanced splatting method - Peter Kulka & Richard Lobb

  14. Conclusion • Three modifications to splatting: • Explicit volume reconstruction and illumination • Correcting of view angle distortions • Reconstruction along the line of projection • Rendering times comparable to splatting • Image quality comparable to ray casting ACSC’99 - An enhanced splatting method - Peter Kulka & Richard Lobb

  15. Future work • More use of texture mapping hardware • Perspective views • Hierarchical versions • Building octrees • Wavelet splatting ACSC’99 - An enhanced splatting method - Peter Kulka & Richard Lobb

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