Lü Shan-shan,JIANG Ming-shun,SU Chen-hui,ZHANG Lei,ZHANG Fa-ye,SUI Qing-mei,JIA Lei.Novel phase difference extraction method of FPP system based on DWT and OMP algorithm[J].Optoelectronics Letters,2020,16(2):131-136 Novel phase difference extraction method of FPP system based on DWT and OMP algorithm Author Name Affiliation Lü Shan-shan  Institute of Marine Science and Technology, Shandong University, Qingdao 266237, China  JIANG Ming-shun  School of Control Science and Engineering, Shandong University, Jinan 250061, China  SU Chen-hui  School of Control Science and Engineering, Shandong University, Jinan 250061, China  ZHANG Lei  School of Control Science and Engineering, Shandong University, Jinan 250061, China  ZHANG Fa-ye  School of Control Science and Engineering, Shandong University, Jinan 250061, China  SUI Qing-mei  School of Control Science and Engineering, Shandong University, Jinan 250061, China  JIA Lei  Institute of Marine Science and Technology, Shandong University, Qingdao 266237, China；School of Control Science and Engineering, Shandong University, Jinan 250061, China  Abstract:       In this paper, to reduce the non-linear phase error caused by gamma effect of the digital projector, a novel phase difference extraction method is proposed. First, through multi-layer discrete wavelet decomposition (DWT), the components of the original phase difference at different frequencies are extracted. Subsequently, the effective components are taken by the orthogonal matching pursuit (OMP) algorithm, and the phase difference is reconstructed. According to the upper and lower envelopes of the original phase difference extracted by cubic spline interpolation, the residual threshold of OMP is set. According to the results of three-dimensional (3-D) reconstruction experiment on a standard sphere, the proposed method is capable of reducing the errors in the original phase difference and achieving a better imaging result. Hits: 800 Download times: 0 View Full Text    Download reader