Histogram-based orientation analysis for junctions

This article presents an algorithm for multiple orientation estimation at junctions which can be used as a first step towards a complete description of the junction structure. The algorithm uses the structure tensor approach to determine the orientations of the edges or lines that meet at a junction and then extracts the principal orientations from a histogram of the orientation angles in a circular region around the junction. In contrast to previous solutions it uses only first-order derivatives and is suited for junctions with an arbitrary number of orientations without increasing the runtime.