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Appl Opt. 2006 Jul 20;45(21):5086-91.

Fast three-step phase-shifting algorithm.

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Department of Mechanical Engineering, State University of New York at Suny Brook, New York 11794-2300, USA.


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 lookup table. 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 three-dimensional shape measurement system, we were able to achieve a measurement speed of 40 frames per second at a resolution of 532 x 500 pixels, all with an ordinary personal computer.

[Indexed for MEDLINE]

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