Equivalence of cost generators for minimum cost flow phase unwrapping
Hubig, Michael and Suchandt, Steffen and Adam, Nico (2002) Equivalence of cost generators for minimum cost flow phase unwrapping. Journal of the Optical Society of America A, 19 (1), pp. 64-70.
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Phase unwrapping represents a crucial Step in processing phase data obtained with techniques such as synthetic aperture radar interferometry, speckle interferomtry, and magnetic resonance imaging. The so-called branch-cut approaches form an important class of phase unwrapping algorithms. In 1996, Costantini proposed to transform the problem of correctly placing branch cuts into a minimum cost flow problem [Proceedings of the Fringe 96 Workshop (European Space Agency, Munich, 1996), pp. 261-272]. The critical point of this new approach is to generate cost functions that have to represent all the a priori knowledge necessary for phase unwrapping. Any function transforming a priori knowledge into a cost function is called a cost generator. Several types of algorithms ranging from heuristic approaches to generators based on probability-theory interpretations were suggested. A problem arising from the growing diversity of algorithms is to find a criterion for the equivalence of different cost generators. Two cost generators are equivalent if they produce cost functions with the same minimal flow for every residue configuration on every image with all possible a priori knowledge. Comparing the results of different cost generators on test scenes can show only their non-equivalence. We solve this problem by proving the following mathematical classification theorem: Two cost generators are equivalent if and only if one can be transformed into the other by multiplication by a fixed constant.
|Title:||Equivalence of cost generators for minimum cost flow phase unwrapping|
|Journal or Publication Title:||Journal of the Optical Society of America A|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 64-70|
|Keywords:||Minimum Cost Flow, MCF, Phase Unwrapping, Cost Generator, SAR Interferometry|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W EO - Erdbeobachtung|
|DLR - Research area:||Space|
|DLR - Program:||W EO - Erdbeobachtung|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||Remote Sensing Technology Institute|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||26 Jan 2006|
|Last Modified:||06 Jan 2010 22:09|
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