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Journal of Electronic Imaging

Comparative performance evaluation of various fringe thinning algorithms in photomechanics
Author(s): Krishnamurthi Ramesh; Rajeev Kumar Singh
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Paper Abstract

In recent years several algorithms have been reported for automating fringe data collection in photomechanics using the technique of digital image processing (DIP). Recent advances in phase shifting interferometry have offered some hope for full automation of static problems. However, for real-time dynamic studies conventional recording of fringes is a must. Fringe thinning is a very crucial step in extracting data for further processing. The various DIP algorithms for fringe thinning are surveyed and an attempt is made to explain better the mechanism of fringe skeleton extraction by various algorithms. The algorithm of Ramesh and Pramod is improved to extract fringe skeletons from saddle points in the fringe field. A cornparative performance evaluation of these algorithms is discussed with respect to the quality and accuracy of fringe skeleton extracted and the processing time. Performance evaluation is done on a few computer-generated. test images and also on images recorded by the technique of photoelasticity. The improved version of the algorithm of Ramesh and Pramod is found to give better fringe skeletons; it is also the fastest and the processing time is an order of magnitude less than the other algorithms. It is proposed that these computergenerated test images could be used as standard test images for checking the performance of any new fringe thinning algorithm.

Paper Details

Date Published: 1 January 1995
PDF: 13 pages
J. Electron. Imag. 4(1) doi: 10.1117/12.191333
Published in: Journal of Electronic Imaging Volume 4, Issue 1
Show Author Affiliations
Krishnamurthi Ramesh, Indian Institute of Technology (India)
Rajeev Kumar Singh, Indian Institute of Technology (India)

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