Morphing Transformation of Linear Features by Using Independent Bend Structures More Sufficiently
Peng Dong-lian · Acta Geodaetica et Cartographica Sinica · 2014
This paper proposes a morphing approach for linear features by using their independent bend structures more sufficiently.Firstly,the constrained Delaunay triangulations(CDT)of the pair of linear features are respectively constructed.Bend structures are identified and represented by bend forests.Secondly,corresponding bends are obtained by bend matching.To use independent bend structures more sufficiently,the CDT of every pair of the obtained corresponding bends are constructed.Then the new pairs of bend forests on the back-side of these corresponding bends are built.Again,bend matching is implemented on the new pairs of bend forests and new corresponding bends are obtained.This process is iteratively carried out until no more corresponding bends can be found.Thirdly,the starts and ends of all the pairs of corresponding bends are used to split the two original linear features so that corresponding segments are obtained.The linear interpolation algorithm is utilized to detect corresponding points for every pair of the corresponding segments.Lastly,straight-line trajectories are used for morphing.The experimental results show that the proposed approaches can improve the ability of identifying corresponding characteristic points and preserving characteristic points in the process of morphing.