Closure to "Accuracy of Digital Image Correlation for Measuring Deformation in Transparent Media" by Samer Sadek, Magued G. Iskander, and Jinyuan Liu

The writers would like to thank the discussers for the interest in our work and for sharing their related research with Geo-PIV. Measurement of deformation using digital image correlation is becoming an invaluable tool in civil engineering. Digital image correlation (DIC) is a classic pattern recognition technique in which two images are compared to obtain the relative displacement between them. DIC is widely used in many engineering fields to obtain spatial deformation patterns, albeit with several names. It is also known as particle image velocimetry (PIV), image cross-correlation, block or region matching method, surface displacement analysis, and subregion scanning computer vision. In geotechnical engineering, DIC has also been used by Horii et al. (1998), Guler et al. (1999), and Rechenmacher and Saab (2002).) Giachetti, A. (2000).