Send to

Choose Destination
Opt Express. 2010 Mar 1;18(5):5229-44. doi: 10.1364/OE.18.005229.

Dual-frequency pattern scheme for high-speed 3-D shape measurement.

Author information

Department of Electrical Engineering, University of Kentucky, Lexington, KY 40507, USA.


A novel dual-frequency pattern is developed which combines a high-frequency sinusoid component with a unit-frequency sinusoid component, where the high-frequency component is used to generate robust phase information, and the unit-frequency component is used to reduce phase unwrapping ambiguities. With our proposed pattern scheme, phase unwrapping can overcome the major shortcomings of conventional spatial phase unwrapping: phase jumping and discontinuities. Compared with conventional temporal phase unwrapped approaches, the proposed pattern scheme can achieve higher quality phase data using a less number of patterns. To process data in real time, we also propose and develop look-up table based fast and accurate algorithms for phase generation and 3-D reconstruction. Those fast algorithms can be applied to our pattern scheme as well as traditional phase measuring profilometry. For a 640 x 480 video stream, we can generate phase data at 1063.8 frames per second and full 3-D coordinate point clouds at 8.3 frames per second. These achievements are 25 and 10 times faster than previously reported studies.


Supplemental Content

Full text links

Icon for Optical Society of America
Loading ...
Support Center