Quasiconformal Dilatation of Projective Transformations and Discrete Conformal Maps
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We consider the quasiconformal dilatation of projective transformations of the real projective plane. For non-affine transformations, the contour lines of dilatation form a hyperbolic pencil of circles, and these are the only circles that are mapped to circles. We apply this result to analyze the dilatation of the circumcircle preserving piecewise projective interpolation between discretely conformally equivalent triangulations. We show that another interpolation scheme, angle bisector preserving piecewise projective interpolation, is in a sense optimal with respect to dilatation. These two interpolation schemes belong to a one-parameter family.
KeywordsPiecewise projective Optimal quasiconformal mapping Discrete complex analysis
Mathematics Subject Classification30C62 52C26
This research was supported by the DFG Collaborative Research Center TRR 109 “Discretization in Geometry and Dynamics”.
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