Home – Home – Jornals – Avtometriya 2005 number 2

The approach to estimating the processes of localized plastic strain on a mesoscale level, which is based on constructing the fields of displacement vectors obtained by processing pairs of images, is developed. Comparative study of the algorithms from the viewpoint of noise immunity and time of determining surface displacements is carried out. The effects of subpixel calculation accuracy of displacements and postcorrection on the results of construction of displacement vector fields and subsequent calculation of strain components are analyzed. It is shown that the subpixel accuracy of constructing the displacement vector fields allows one to interpret more correctly the physical sense of the running processes and increase the accuracy of determining the strain components: components of the distortion tensor, the main plastic displacement, etc.