Complementary phase interleaving-based fringe order recognition for temporal phase unwrapping

Abstract

This paper introduces a complementary phase interleaving-based fringe order recognition method, designed to rectify phase errors encountered in temporal phase unwrapping. Addressing challenges arising from noise interference or misalignment between fringe order and the wrapped phase, this method employs an innovative integration of a smooth-wrapped phase and the interleaved complementary phases with precise π phase shifts. Furthermore, it maximizes measurement accuracy and prevents filtering-induced degradation by back-calculating the fringe order of noise-disturbed phases from the smooth-continuous phase. Its remarkable adaptability across various temporal phase unwrapping methods, without necessitating additional structural patterns, underscores its versatility in addressing a broad spectrum of phase error suppression challenges. Experimental validation substantiates the accuracy and adaptability of this method, demonstrating its efficacy in handling diverse types of phase errors within TPU methods. This advancement stands as a pivotal solution for achieving precise and comprehensive phase error suppression, particularly for multiple isolated objects.