Image segmentation of vickers indentations using shape from focus

Authors:
Michael Gadermayr;Andreas Uhl
Affiliations:
Multimedia Signal Processing and Security Lab, Department of Computer Sciences, University of Salzburg, Austria;Multimedia Signal Processing and Security Lab, Department of Computer Sciences, University of Salzburg, Austria
Venue:
ICIAR'12 Proceedings of the 9th international conference on Image Analysis and Recognition - Volume Part I
Year:
2012

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Abstract

To measure the hardness of a material, an indenter is pressed into the material and the deformation is measured. As we focus on Vickers hardness testing, our exercise is to compute the diagonal lengths of a square indentation. We especially investigate if it is possible to reconstruct the shape of the indentation by the use of the Shape-from-Focus method. We show that the shape information alone does not contain enough information for a robust segmentation. However, we incorporate the depth information into an effective existing approach and achieve significantly better results.