Phase unwrapping simulation of dual-frequency combined analog encoding structured light

In order to improve the measurement accuracy of phase shift method, we present a novel dual-frequency combined analog encoding phase unwrapping model and 3D measurement method. This engineered phase unwrapping model is built based on two phase principal values of one pixel from two different periodic fringe images. By calculating analytic solution from remainder formula, this model has simple and fast advantages; and by adding one rounding process, measurement error can be limited in some extent. Furthermore, based on cosine phase shift, 3D measurement method of dual-frequency combined analog encoding phase unwrapping is presented. Then theoretical analysis, simulation and actual experiment are used to verify the proposed model and method in this paper.