Large components are widely used in aerospace, shipbuilding, automobile, and other fields.
The accuracy of three-dimension (3D) measurement is an important standard to measure …

Fringe analysis is the process of extracting quantitative measurement data from fringe—or
line—patterns. It usually consists of phase detection and phase unwrapping. Phase …

We first provide an overview of 3-D shape measurement using various optical methods.
Then we focus on structured light techniques where various optical configurations, image …

The field of optical metrology offers a wealth of both practical and theoretical
accomplishments, and can cite any number of academic papers recording such. However …

Where conventional testing and inspection techniques fail at the micro-scale, optical
techniques provide a fast, robust, and relatively inexpensive alternative for investigating the …

Temporal phase unwrapping is a method of analyzing fringe patterns in which the fringe
phase Φ at each pixel is measured and unwrapped as a function of time t. We propose two …

We present novel algorithms using multi-frequency analysis for full-field profilometry. The
technique provides absolute order of interference in an interferogram. The process is based …

Projected fringes can be used to measure surface profiles unambiguously, even in the
presence of surface discontinuities, if the fringe pitch is changed over time. We investigate …

A novel technique using color-encoded stripes embedded into a sinusoidal fringe pattern for
finding the absolute shape of an object is proposed. Phases of the projected fringes on the …

We address a framework to reduce the unwrapping errors of the measurement system using
a digital multiple-wavelength phase-shifting algorithm. In particular, the following framework …