Double-step phase-shifting algorithm for fringe-projection measurement

作者：Zheng Dongliang; Da Feipeng^*

来源：Acta Optica Sinica, 2012, 32(5).

DOI：10.3788/AOS201232.0512004

• Digital fringe projection
• Double-step
• Fringe pattern
• Fringe projection
• Phase maps
• Phase-shifting algorithm

Double three-step phase shifting algorithm (PSA) works well in reducing the measurement error for a digital fringe projection profilometric system. Based on theoretical analysis and experiments, double four-step PSA and double five-step PSA are proposed. In addition, a new method to average two obtained phase maps and to generate the correct phase map is presented, which is simple and effective for double-step PSA. Experiment verifies the correctness of double four-step PSA and double five-step PSA which can reduce much more measurement error than double three-step PSA in the practical applications. The advantages of three-step, four-step and five-step PSA are kept through projecting double the number of fringe patterns which are needed for traditional phase shifting algorithm.

• 出版日期2012
• 单位东南大学