Combining Line and Point Correspondences for Homography Estimation
By Elan Dubrofsky
We present a method to extend the
normalized direct linear transform (DLT) algorithm for homography estimation.
Previously, only point correspondences were used. Now, line correspondences can
be included as well. This extension is point-centric in that the lines are
normalized to fit with the normalization used for points. Therefore, this method
will be most useful if there are more point correspondences than line
correspondences. Our main contribution is the derivation of an equation to
normalize lines compatible with point normalization. We also show that using
lines directly produces more accurate results than using their point
intersections. Testing is provided both using a simple chessboard example and a
real world example from the UBC hockey tracking system.
This is joint work with Robert J. Woodham.