Optics: measuring and testing – Shape or surface configuration – By specular reflection
Reexamination Certificate
2005-12-06
2010-06-08
Stafira, Michael P (Department: 2886)
Optics: measuring and testing
Shape or surface configuration
By specular reflection
C356S601000
Reexamination Certificate
active
07733504
ABSTRACT:
A shape evaluation device performs simulation by using an annular light source or concentric light source instead of a rectilinear light source and calculates a characteristic line for performing shape evaluation. The shape evaluation device includes a calculation device (2) having: a distance vector calculation unit (2a) for acquiring a distance vector representing a distance between the circle and the vector, a distance function unit (2b) for acquiring a distance function from the distance vector, and a distance function calculation unit (2c) for acquiring a point on a curved surface where the value of the distance function is a predetermined value. By performing simulation using the annular or concentric light source, it is possible to obtain a characteristic line capable of observing distortion in all the directions by one calculation. The present invention reduces the number of calculations required for calculating the characteristic line for performing shape evaluation and reduce the time required for calculation, thereby enabling evaluation by a dynamic shape.
REFERENCES:
Lin Hongwei et al., “Constructing Iterative Non-Uniform B-spline Curve and Surface to Fit Data Points”, Science in China (Information Sciences), 2004.
Loos et al., “Modeling of Surfaces with Fair Reflection Line Pattern”, IEEE, 1999.
Loos et al., “Modeling of Surfaces with Fair Reflection Line Pattern”, IEEE, 1999.
Thomas Poeschl; “Detecting surface irregularities using isophotes”, Computer Aided Geometric Design 1, 1984, pp. 163-168.
I. Choi et al.; “Efficient generation of reflection lines to evaluate car body surfaces”, Math. Engng. Ind., vol. 7, No. 2, 1998, pp. 233-250.
Gershon Elber; “Curve Evaluation and Interrogation on Survaces”, Jun. 22, 2005.
Klaus-Peter Beier et al.; “Highlight-line algorithm for realtime surface-quality assessment”, Computer-Aided Design, vol. 26, No. 4, Apr. 4, 1994.
Yifan Chen et al.; “Direct Highlight line modification on nurbs surfaces”, Computer Aided Geometric Design 14, 1997, pp. 583-601.
Junji Sone et al.; “Surface highlight control using Quartic Blending NURBS Boundary Gregory Patch”, vol. 37, No. 12, Dec. 1996.
Caiming Zhang et al.; “Removing local irregularities of NURBS surfaces by modifying highlight lines”; Comuter Aided Design, vol. 30, No. 12, 1998, pp. 923-930.
Jun-Hai Yong et al.; “Dynamic highlight line generation for locally deforming NURBS surfaces”; Computer-Aided Design 35, 2003, pp. 881-892.
J. E. Hacke, Jr.; “A Simple Solution of the General Quartic”, The American Mathematical Monthly, vol. 48, No. 5, May 1941, pp. 327-328.
International Search Report of PCT/JP2005/022356, date of mailing Feb. 14, 2006.
Maekawa Takashi
Nishimura Yoh
Nishiyama Yuu
Sasaki Takayuki
National University Corporation Yokohama National University
Stafira Michael P
Westerman Hattori Daniels & Adrian LLP
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