SMI 2012: Full Curve intersection using hybrid clipping

  • Authors:
  • Qi Lou;Ligang Liu

  • Affiliations:
  • Department of Mathematics, Zhejiang University, Hangzhou 310027, China;Department of Mathematics, Zhejiang University, Hangzhou 310027, China

  • Venue:
  • Computers and Graphics
  • Year:
  • 2012

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Abstract

This paper presents a novel approach, called hybrid clipping, for computing all intersections between two polynomial Bezier curves within a given parametric domain in the plane. Like Bezier clipping, we compute a 'fat line' (a region along a line) to bound one of the curves. Then we compute a 'fat curve' around the optimal low degree approximation curve to the other curve. By clipping the fat curve with the fat line, we obtain a new reduced subdomain enclosing the intersection. The clipping process proceeds iteratively and then a sequence of subdomains that is guaranteed to converge to the corresponding intersection will be obtained. We have proved that the hybrid clipping technique has at least a quadratic convergence rate. Experimental results have been presented to show the performance of the proposed approach with comparison with Bezier clipping.