Stabilizing Heteroscedastic Noise with the Generalized Anscombe Transform: Application to Accurate Prediction of the Resolution in Displacement and Strain Maps Obtained with the Grid Method

  • M. Grédiac
  • F. Sur
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)


The objective of this paper is to show that it is possible to predict the noise level in displacement and strain maps obtained with the grid method, but that actual noise of camera sensors being heteroscedastic, it is necessary to stabilize this noise in grid images prior to employing the predicting formulas. The procedure used for this purpose relies on the Generalized Anscombe Transform. This transform is first described. It is then shown that experimental and theoretical resolutions in strain maps obtained with the grid method are in good agreement when this transform is employed.


Displacement Generalized Anscombe transform Grid method Noise Strain measurement Metrological performance 


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Copyright information

© The Society for Experimental Mechanics, Inc. 2015

Authors and Affiliations

  1. 1.UMR CNRS 6602Clermont Université, Université Blaise Pascal, Institut PascalClermont-FerrandFrance
  2. 2.Laboratoire Lorrain de Recherche en Informatique et ses ApplicationsUMR CNRS 7503 Université de Lorraine, CNRS, INRIA Projet MagritVandoeuvre-lès-Nancy, CedexFrance

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