Phase Extraction Method in Fringe Projection Profilometry Using Instantaneous Frequency

Abstract

Three-dimensional (3-D) surface profiles can be obtained by using non-contact optical profilometry techniques. Fringe projection profilometry is widely used for three dimensional (3-D) surface shape, measurement using phase-shifting (PS) methods with multiple projected fringe pattern or transform methods with single projected fringe pattern. In this paper, Our research has focused on the study of the phase extraction method from a single fringe pattern in fringe projection profilometry using the instantaneous frequency method as one of the relevant techniques in the field of signal processing. The main advantage of this method of analysis based on the notion of instantaneous frequency is that it requires only one fringe pattern, which made from this method well suited for real-time measurement. The effectiveness of the instantaneous frequency method is illustrated by their comparison with traditional methods.