Phase-error restraint with the empirical mode decomposition method in phase measurement profilometry  

作　　者：WEN YongFu CHENG HaoBo GAO Ya ZHANG HuiJing 

机构地区：[1]School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China

出　　处：《Chinese Science Bulletin》2012年第14期1648-1654,共7页

基　　金：sipported by the National Natural Science Foundation of China (61128012,60978043,61061160503);the Research Grants Council of the Hong Kong Special Administrative Region (9041577)

摘　　要：Phase measurement profilometry(PMP) uses a digital projector and a camera for 3D shape measurement.However,the nonlinear response of the measurement system causes the captured perfect sinusoidal fringe patterns to become non-sinusoidal waveforms,which results in phase and measurement errors.We perform a theoretical analysis of the phase error resulting from non-sinusoidal fringe patterns.Based on a derived phase-error expression,the empirical mode decomposition(EMD) method is introduced to restrain nonlinear phase error and improve the precision in evaluating the phase distribution.A computer simulation and experimental results prove that the proposed method can eliminate possible phase-error in PMP.Phase measurement profilometry （PMP） uses a digital projector and a camera for 3D shape measurement. However, the nonlinear response of the measurement system causes the captured perfect sinusoidal fringe patterns to become non-sinusoidal waveforms, which results in phase and measurement errors. We perform a theoretical analysis of the phase error resulting from non-sinusoidal fringe patterns. Based on a derived phase-error expression, the empirical mode decomposition （EMD） method is introduced to restrain nonlinear phase error and improve the precision in evaluating the phase distribution. A computer simulation and experi- mental results prove that the proposed method can eliminate possible phase-error in PMP.

关 键 词：相位测量轮廓术 相位误差 模式分解法 非线性响应 三维形状测量 经验模式分解 数字投影仪 计算机仿真 

分 类 号：P207.2[天文地球—测绘科学与技术]