OSA's Digital Library

Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 35, Iss. 12 — Jun. 15, 2010
  • pp: 1992–1994

Generic gamma correction for accuracy enhancement in fringe-projection profilometry

Thang Hoang, Bing Pan, Dung Nguyen, and Zhaoyang Wang  »View Author Affiliations


Optics Letters, Vol. 35, Issue 12, pp. 1992-1994 (2010)
http://dx.doi.org/10.1364/OL.35.001992


View Full Text Article

Enhanced HTML    Acrobat PDF (248 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

Fringe-projection profilometry is one of the most commonly used noncontact methods for acquiring the three- dimensional (3D) shape information of objects. In practice, the luminance nonlinearity caused by the gamma effect of a digital projector and a digital camera yields undesired fringe intensity changes, which substantially reduce the measurement accuracy. In this Letter, we present a robust and simple scheme to eliminate the intensity nonlinearity induced by the gamma effect by combining a universal phase-shifting algorithm with a gamma correction method. First, by using three-step and large-step phase-shifting techniques, the gamma value involved in the measurement system can be detected. Then, a gamma pre-encoding process is applied to the system for actual 3D shape measurements. With the proposed technique, high accuracy of measurement can be achieved with the conventional small-step phase-shifting algorithm. The validity of the technique is verified by experiments.

© 2010 Optical Society of America

OCIS Codes
(110.6880) Imaging systems : Three-dimensional image acquisition
(120.2830) Instrumentation, measurement, and metrology : Height measurements
(120.6660) Instrumentation, measurement, and metrology : Surface measurements, roughness
(150.6910) Machine vision : Three-dimensional sensing

ToC Category:
Imaging Systems

History
Original Manuscript: March 29, 2010
Manuscript Accepted: May 11, 2010
Published: June 7, 2010

Citation
Thang Hoang, Bing Pan, Dung Nguyen, and Zhaoyang Wang, "Generic gamma correction for accuracy enhancement in fringe-projection profilometry," Opt. Lett. 35, 1992-1994 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-12-1992

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited