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The recent development of ecient 3D imaging tools such as X-Rays computed  microtomography combined with the extension to volumetric images of Digital  Image Correlation (DIC) techniques provide new insights on the analysis of  materials and structures. Among many other possible elds of application,  geomaterials are good candidates for such investigations, owing to their  relative transparency to X-rays and the presence in many samples of a natural  contrast suitable for deformation mapping. However, these materials often deform  discontinuously at microscale, for instance in the form of the development of a  networks of microcracks. Discontinuity is even the dominant rule in  granular-type materials such as sand in which the contribution to overall  deformation of the microcontinuous phenomena -elastic strains inside grains- are  negligible. To investigate deformation at the scale of these discontinuous  mechanisms, specic DIC algorithms are required, which override the assumption  of continuity of the transformation at the scale of the correlation windows. The  recent so-called Discrete-DIC procedure (Hall et al, 2010) is a possible answer.  We recall here its general principles and focus on its potential accuracy, from  both theoretical and practical points of view. We show that the position and the  rotation of individual grains with an average diameter of 500µm  can be determined from images recorded with a laboratory microCT scanner, with a  15µm voxel size, with an accuracy of the order of  1µm and 0,1 degree, respectively

Discrete volumetric digital image correlation for the investigation of granular type media at microscale: accuracy assessment