Digital Image Correlation Of White Light Speckle Including The Effects Of Image Distortion

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Abstract
An image correlation theory of white light speckle is presented which describes the light intensity as a continuous function for both the reference and deformed images. The reference image is divided into small regions corresponding to small subimages of the object surface. The subimage forms the basic element of the process of image correlation. The subimage of the undeformed intensity pattern is mapped to the deformed surface in order to compare its location to a corresponding location on the deformed intensity surface. This mapping function mathematically translates, rotates and deforms small subimages until the best fit is obtained with the recorded data. The following is thus obtained: (1) translation, (2) rotation, and (3) deformation.

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