"Optimal fringe angle selection for digital fringe projection technique," Appl. Opt., (2013)

[55] Y. Wang*, and S. Zhang, "Optimal fringe angle selection for digital fringe projection technique," Appl. Opt. 52(29),  7094-7098, 2013; doi: 10.1364/AO.52.007094

Abstract

Existing digital fringe projection (DFP) systems mainly use either horizontal or vertical fringe patterns for three-dimensional shape measurement. This paper reveals that these two fringe directions are usually not optimal where the phase change is the largest to a given depth variation. We propose a novel and efficient method to determine the optimal fringe angle by projecting a set of horizontal and vertical fringe patterns onto a step-height object and by further analyzing two resultant phase maps. Experiments demonstrate the existence of the optimal angle and the success of the proposed optimal angle determination method.