A new methodology is proposed to estimate 3D displacement fields from pairs of images obtained from X-Ray Computed Micro Tomography (XCMT). Contrary to local approaches, a global approach is followed herein that evaluates {\em continuous} displacement fields. Although any displacement basis could be considered, the procedure is specialized to finite element shape functions. The method is illustrated with the analysis of a compression test on a polypropylene solid foam (independently studied in a companion paper). A good stability of the measured displacement field is obtained for cubic element sizes ranging from 16 voxels to 6 voxels.
@article{arxiv.0712.2642,
title = {Three dimensional image correlation from X-Ray computed tomography of solid foam},
author = {Stephane Roux and François Hild and Philippe Viot and Dominique Bernard},
journal= {arXiv preprint arXiv:0712.2642},
year = {2007}
}