Generic gamma correction for accuracy enhancement in fringe-projection profilometry

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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.
Funding Information
  • National Science Foundation (NSF) (CMMI-0825806)
  • U.S. Air Force Office of Scientific Research (USAFOSR) (FA9550-09-1-0488)

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