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Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns
Published on: August 30, 2013
Fast algorithm for estimation of the orientation term of a general quadrature transform with application to
Daniel Crespo1, Juan Antonio Quiroga, Jose Antonio Gomez-Pedrero
1Departamento de Optica, Facultad de Ciencias Físicas, Universidad Complutense, Ciudad Universitaria s/n 28040 Madrid, Spain. daniel.crespo@indizen.com
Abstract:
The spatial orientation of fringes has been demonstrated to be a key point in reliable phase demodulation from a single n-dimensional fringe pattern, regardless of the frequency spectrum of the signal. Recent publications have shown a general method for determination of the orientation factor by use of a regularized phase-tracking (RPT) algorithm. We propose a generalization of a RPT algorithm for estimation of the spatial orientation in a general n-dimensional case. The proposed algorithm makes use of a simplified cost function that remains one dimensional regardless of the dimension of the problem. This makes the calculation faster than with a standard RPT algorithm, with which it is necessary to minimize an n + 1-dimensional cost function for each point of the sample space. We have applied the method to the three-dimensional demodulation of a time-evolving fringe pattern, with good results.
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