Dual-path Phase Unwrapping Algorithm Based on Geodesic Curvature for Interferometric Fringe Analysis

We present a path-dependent phase unwrapping algorithm with the dual-path scheme. The proposed algorithm removes the inconsistency between the true phase and its wrapped phase by rolling up a 1D wrapped phase array around a cylindrical surface. The dual-path scheme entails phase unwrapping by using two different paths linked from an arbitrary position to other points in 2D wrapped phase images. The proposed algorithm is confirmed to be as fast as the UNWRAP in MATLAB, and its noise resistance is comparable to that of the conventional algorithms up to a signal-to-noise ratio (SNR) of 6 dB.