Rapid extraction of central vacancy by image-analysis of Fry plots

► An easy-to-use and versatile method for strain estimation from a Fry plot image. ► The method uses Gaussian blur technique for sharpening the central vacancy. ► Using threshold and inversion filter, it directly extracts sharp central vacancy. ► It fits ellipse through central vacancy and displays results in a separate window. ► The method yields reproducible results without any subjectivity.