Letter
A convenient look-up-table based method for the compensation of non-linear error in digital fringe projection

https://doi.org/10.1016/j.taml.2015.12.005Get rights and content
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Highlights

  • The theoretical analysis of the nonlinear errors in digital fringe projection is deduced.

  • The LUT is made from measured phase map without extra calibration experiment.

  • The process of algorithm is convenient to be applied in real-time digital fringe projection.

Abstract

Although the structured light system that uses digital fringe projection has been widely implemented in three-dimensional surface profile measurement, the measurement system is susceptible to non-linear error. In this work, we propose a convenient look-up-table-based (LUT-based) method to compensate for the non-linear error in captured fringe patterns. Without extra calibration, this LUT-based method completely utilizes the captured fringe pattern by recording the full-field differences. Then, a phase compensation map is established to revise the measured phase. Experimental results demonstrate that this method works effectively.

Keywords

Phase measurement
Digital fringe projection
Non-linear error compensation
Digital image processing

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