Samer Sadek, Magued G. Iskander, and Jinyuan Liu, have published “Accuracy of Digital Image Correlation for Measuring Deformations in Transparent Media” in J. Comp. in Civ. Engrg., Volume 17, Issue 2, pp. 88-96 (April 2003). The researches used URAPIV as the basis for their Digital Image Correlation method.