Characterization of corners of curvilinear segment

Details Characterization of corners of curvilinear segment Characterization of corners of curvilinear segment

1997-06-25

2000-06-06

Powell, Mark R.

Computer graphics processing and selective visual display system

Computer graphics processing

Shape generating

G06T 1120

Patent

active

060725028

ABSTRACT:
A system determines discontinuities on a drawn curve. Local tangent values for a curvilinear segment are generated by determining the most likely tangent value for all points on the segment and by acting on a sampling of points around the current point whose tangent is to be determined. A robust statistical estimator is then applied to all angle values generated for the sample set to determine the likely intended tangent direction of the current focal point. The system then selects points with significant changes in tangent values to determine curve discontinuities such that the corners of the segment can be derived.

REFERENCES:
patent: 5594852 (1997-01-01), Tankelevich
patent: 5611036 (1997-03-01), Berend et al.
A. Blake et al., "Weak Continuity Constraints Generate Uniform Scale-Space Descriptions of Plane Curves", Scotland.
A. Blake, et al., Weak Continuity Constraints Generate Uniform Scale-Space Descriptions of Plane Curves (date unavailable).
Richard L. Burden, et al., Numerical Analysis, Second Edition, Chapter 9 (Numerical Solutions of Nonlinear Systems of Equations), 1981, pp. 439-461 .

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