This paper introduces a method to measure the R-value from a speckled pattern with respect to the strain rate and loading direction. The R-value is calculated from series of images taken by a high speed camera by analyzing the deformation history during static and dynamic tensile tests. A Matlab code to track designated points by digital image correlation algorithm was constructed to measure the longitudinal and transversal strain from the speckled pattern, which was created by spraying black paint on white-paint-coated tensile specimens. Using the suggested method, R-values of TRIP590 1.2t and DP780 1.0t were measured with the variation of the strain rate (0.001/sec ~ 100/sec) and loading direction (0° ~ 90°).