An optimisation approach to improving the accuracy of the Hough transform: plane orientations from skew symmetry

Straight lines from a single perspective image are used to determine orientations of objects in an image scene using skew symmetry. The lines are detected using a Hough transform followed by an optimization algorithm in order to remove discretization errors in the line parameters. The use of these accurate line parameter estimates is demonstrated with some test images for which the plane orientations are known. It is shown that orientations from skew symmetry can be reliably determined