A fast three-step phase shifting algorithm

Peisen S. Huang; Song Zhang

doi:10.1117/12.631259

7 November 2005 A fast three-step phase-shifting algorithm

Peisen S. Huang, Song Zhang

Proceedings Volume 6000, Two- and Three-Dimensional Methods for Inspection and Metrology III; 60000F (2005) https://doi.org/10.1117/12.631259
Event: Optics East 2005, 2005, Boston, MA, United States

Abstract

We propose a new three-step phase-shifting algorithm, which is much faster than the traditional three-step algorithm. We achieve the speed advantage by using a simple intensity ratio function to replace the arctangent function in the traditional algorithm. The phase error caused by this new algorithm is compensated for by use of a look-up-table (LUT). Our experimental results show that both the new algorithm and the traditional algorithm generate similar results, but the new algorithm is 3.4 times faster. By implementing this new algorithm in a high-resolution, real-time 3D shape measurement system, we were able to achieve a measurement speed of 40 frames per second (fps) at a resolution of 532 × 500 pixels, all with an ordinary personal computer.

Citation Download Citation

Peisen S. Huang and Song Zhang "A fast three-step phase-shifting algorithm", Proc. SPIE 6000, Two- and Three-Dimensional Methods for Inspection and Metrology III, 60000F (7 November 2005); https://doi.org/10.1117/12.631259

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