Unwrapping of Isochromatic Fringe Orders Using Fringe Gradient Method

Abstract

A new phase unwrapping algorithm for the automatic determination of the isochromatic parameter (absolute fringe order) from a single-color isochromatic image using the fringe gradient and RGB wavelengths techniques is developed. To evaluate the effectiveness of the proposed method, a single-color isochromatic image for a circular disk subjected to a concentrated load was used. Numerical simulation results showed that the proposed method yields accurate absolute fringe orders of isochromatics.