基于结构光多频相移法的煤块表面形貌测量
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摘要
提出了一种基于结构光多频相移法的相位校正算法。基于相位梯度,建立可靠度判据,将煤块有效测量区域内的相位点分成两类,并依次对其进行校正。实验分析了所提结构光投影算法的适用性,并测量该算法的精度。实验结果表明,所提方法较好地解决了煤块表面形貌测量中无效相位点的问题。
A phase correction algorithm is proposed based on the structured light multifrequency phase-shifting technique.The phase points in the effective measurement area of coal are divided into two types and corrected in turn according to the reliability criterion constructed based on phase gradient.The applicability and measurement accuracy of the proposed algorithm are tested experimentally.The experimental results show that the proposed algorithm can be used to well resove the problem of invalid phase points occurred during the surface profile measurement of coal.
A phase correction algorithm is proposed based on the structured light multifrequency phase-shifting technique.The phase points in the effective measurement area of coal are divided into two types and corrected in turn according to the reliability criterion constructed based on phase gradient.The applicability and measurement accuracy of the proposed algorithm are tested experimentally.The experimental results show that the proposed algorithm can be used to well resove the problem of invalid phase points occurred during the surface profile measurement of coal.
引文
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[9]Lu J,Mo R,Sun H B,et al.Invalid phase values removal method for absolute phase recovery[J].Applied Optics,2016,55(2):387-394.
[10]Zhang S.Phase unwrapping error reduction framework for a multiple-wavelength phase-shifting algorithm[J].Optical Engineering,2009,48(10):105601.
[11]Wang H X,Qian K M,Soon S H.Valid point detection in fringe projection profilometry[J].Optics Express,2015,23(6):7535-7549.
[12]Feng S J,Chen Q,Zuo C,et al.Automatic identification and removal of outliers for high-speed fringe projection profilometry[J].Optical Engineering,2013,52(1):013605.
[13]Song L M,Chang Y L,Li Z Y,et al.Application of global phase filtering method in multi frequency measurement[J].Optics Express,2014,22(11):13641-13647.
[14]Huang L,Asundi A K.Phase invalidity identification framework with the temporal phase unwrapping method[J].Measurement Science and Technology,2011,22(3):035304.
[15]Zhang C W,Zhao H,Gu F F,et al.Phase unwrapping algorithm based on multi-frequency fringe projection and fringe background for fringe projection profilometry[J].Measurement Science and Technology,2015,26(4):045203.
[16]Zhang C W,Zhao H,Zhang L.Fringe order error in multifrequency fringe projection phase unwrapping:Reason and correction[J].Applied Optics,2015,54(32):9390-9399.
[17]Zhang S,Li X L,Yau S T.Multilevel quality-guided phase unwrapping algorithm for real-time threedimensional shape reconstruction[J].Applied Optics,2007,46(1):50-57.
[18]Wang Y J,Zhang S.Superfast multifrequency phaseshifting technique with optimal pulse width modulation[J].Optics Express,2011,19(6):5149-5155.
[19]Li Z W,Shi Y S,Zhong K,et al.Projector calibration algorithm for the structured light measurement technique[J].Acta Optica Sinica,2009,29(11):3061-3605.李中伟,史玉升,钟凯,等.结构光测量技术中的投影仪标定算法[J].光学学报,2009,29(11):3061-3605.
[2]Gorthi S S,Rastogi P.Fringe projection techniques:Whither we are?[J].Optics and Lasers in Engineering,2010,48(2):133-140.
[3]Zhang Q C,Su X Y.Research progress of dynamic three-dimensional shape measurement[J].Laser&Optoelectronics Progress,2013,50(1):010001.张启灿,苏显渝.动态三维面形测量的研究进展[J].激光与光电子学进展,2013,50(1):010001.
[4]Takeda M,Mutoh K.Fourier transform profilometry for the automatic measurement of 3Dobject shapes[J].Applied Optics,1983,22(24):3977-3982.
[5]Li B W,An Y T,Zhang S.Single-shot absolute 3Dshape measurement with Fourier transform profilometry[J].Applied Optics,2016,55(19):5219-5225.
[6]Zhang S,van der Weide D,Oliver J.Superfast phaseshifting method for 3D shape measurement[J].Optics Express,2010,18(9):9684-9689.
[7]Zuo C,Huang L,Zhang M L,et al.Temporal phase unwrapping algorithms for fringe projection profilometry:A comparative review[J].Optics and Lasers in Engineering,2016,85:84-103.
[8]Li W H,Bai X F,Yang J H,et al.Correspondence between mean maximum reflectance of vitrinite and classification of bituminous coals[J].Journal of China Coal Society,2006,31(3):342-345.李文华,白向飞,杨金和,等.烟煤镜质组平均最大反射率与煤种之间的关系[J].煤炭学报,2006,31(3):342-345.
[9]Lu J,Mo R,Sun H B,et al.Invalid phase values removal method for absolute phase recovery[J].Applied Optics,2016,55(2):387-394.
[10]Zhang S.Phase unwrapping error reduction framework for a multiple-wavelength phase-shifting algorithm[J].Optical Engineering,2009,48(10):105601.
[11]Wang H X,Qian K M,Soon S H.Valid point detection in fringe projection profilometry[J].Optics Express,2015,23(6):7535-7549.
[12]Feng S J,Chen Q,Zuo C,et al.Automatic identification and removal of outliers for high-speed fringe projection profilometry[J].Optical Engineering,2013,52(1):013605.
[13]Song L M,Chang Y L,Li Z Y,et al.Application of global phase filtering method in multi frequency measurement[J].Optics Express,2014,22(11):13641-13647.
[14]Huang L,Asundi A K.Phase invalidity identification framework with the temporal phase unwrapping method[J].Measurement Science and Technology,2011,22(3):035304.
[15]Zhang C W,Zhao H,Gu F F,et al.Phase unwrapping algorithm based on multi-frequency fringe projection and fringe background for fringe projection profilometry[J].Measurement Science and Technology,2015,26(4):045203.
[16]Zhang C W,Zhao H,Zhang L.Fringe order error in multifrequency fringe projection phase unwrapping:Reason and correction[J].Applied Optics,2015,54(32):9390-9399.
[17]Zhang S,Li X L,Yau S T.Multilevel quality-guided phase unwrapping algorithm for real-time threedimensional shape reconstruction[J].Applied Optics,2007,46(1):50-57.
[18]Wang Y J,Zhang S.Superfast multifrequency phaseshifting technique with optimal pulse width modulation[J].Optics Express,2011,19(6):5149-5155.
[19]Li Z W,Shi Y S,Zhong K,et al.Projector calibration algorithm for the structured light measurement technique[J].Acta Optica Sinica,2009,29(11):3061-3605.李中伟,史玉升,钟凯,等.结构光测量技术中的投影仪标定算法[J].光学学报,2009,29(11):3061-3605.
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