Computer graphics processing and selective visual display system – Computer graphics processing – Three-dimension
Reexamination Certificate
2006-08-29
2006-08-29
Nguyen, Phu K. (Department: 2673)
Computer graphics processing and selective visual display system
Computer graphics processing
Three-dimension
C600S407000, C378S022000
Reexamination Certificate
active
07098907
ABSTRACT:
An explicit definition of a geometric object is converted into a level set which implicitly defines the geometric object. The explicit definition is converted to a form for efficient ray casting. Magnitude and sign values are assigned to a grid of voxels using ray casting in which the magnitude value represent a minimum distance from the voxel to the object and the sign value defines whether the voxel is inside or outside the object. The magnitude and sign values may be removed of discontinuities and smoothed before an accurate level set implicitly defining the object is achieved. Run length encoding may be applied to define a sparse level set in which consecutive voxels having identical values are compressed into a single value including a marker to indicate a quantity of the consecutive voxels.
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patent: 6982710 (2006-01-01), Salomie
Peter et al., Analytical versus Voxelized Phantom Representation for Monte Carlo Simulation in Radiological Imaging, Medical Imaging, IEEE, vol. 19, issue 5, May 2000; pp. 556-564.
Houston Benjamin B.
Wiebe Mark
Battison Adrian D.
Dupuis Ryan W.
Frantic Films Corporation
Nguyen Phu K.
Williams Michael R.
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