Science and Education Publishing American Journal of Mechanical Engineering 1 7 2013 11 04 The Printed Patterns Investigation for the Purposes of Deformation Analysis Performed by Digital Image Correlation System 185 189 EN Martin Hagara Department of Applied Mechanics and Mechatronics, Technical University of Košice, Faculty of Mechanical Engineering, Košice, Slovakia Martin Schr?tter AJME2013176 10.12691/ajme-1-7-6 2013 10 02 2013 10 09 2013 11 04 In this contribution an analysis of printed random patterns used for the evaluation of displacement fields and strain fields by the use of low-speed digital image correlation system is described. For the analysis three patterns with speckles of different shapes and sizes and variously distributed grey values as well were choices. As a quality assessment criteria of the reached results a percentage of non-correlated regions, mean or maximal value of the approximated error radius of the investigated object contour points coordinates were chosen. All these parameters were examined by the evaluation performed by the using of different calibration files and subsequently by the different values of facet size.