用于非均匀条纹的二值时空编码相位展开方法

发布时间：2018-04-05 16:00

本文选题：光学三维测量　切入点：非均匀条纹相位展开　出处：《红外与激光工程》2017年04期

【摘要】：为解除现有非均匀条纹解相位方法对系统测量精度的限制,提出一种非均匀条纹的二值时空编码解相位方法。由标准非均匀条纹的截断相位反求截断相位分界线,对分界线进行二值编码与解码。采用四步相移法,只需三幅辅助编码图像即可准确获得非均匀条纹的绝对连续相位。建立非完全约束系统,利用二次多项式拟合绝对相位与物体深度关系,通过仿真实验与现有方法比较,拱桥形物体各对称点高度差值的均值和均方差分别降低了65%和51%;长方体测量误差的均值和均方差分别降低了95%和90%;同时,利用该方法对实际长方形物体表面进行测量,与三坐标测量仪的测量结果比较,平均误差仅为0.64%。实验结果表明:所述方法可提高非均匀条纹相位展开质量,在减少投影图像幅数的情况下,提高测量精度。
[Abstract]:In order to remove the limitation of the existing non-uniform fringes' phase resolution methods on the measurement accuracy of the system, a binary space-time coding method for resolving the phase of inhomogeneous fringes is proposed.The truncation phase dividing line of standard inhomogeneous fringe is inversely obtained, and the binary coding and decoding of the dividing line are carried out.Using the four-step phase shift method, the absolute continuous phase of the inhomogeneous fringe can be accurately obtained by using only three auxiliary coded images.An incomplete constrained system is established. The relationship between absolute phase and object depth is fitted by quadratic polynomial, and the simulation results are compared with existing methods.The mean and mean square deviation of the height difference of each pair of weighing points of arch bridge are reduced by 65% and 51% respectively, the mean and mean deviation of cuboid measurement error are reduced by 95% and 90%, respectively. At the same time, the method is used to measure the surface of actual rectangular object.The average error is only 0.64 when compared with the result of CMM.The experimental results show that the proposed method can improve the quality of phase unwrapping of non-uniform fringes and improve the measurement accuracy under the condition of reducing the amplitude of projected images.
【作者单位】：河北工业大学机器人及自动化研究所;中国民航大学天津市民用航空器适航与维修重点实验室;
【基金】：国家自然基金委员会与中国民用航空局联合资助(U1433117) 中国民航科技重大专项(MHRD20130104) 中国民航大学天津市民用航空器适航与维修重点实验室开放基金
【分类号】：TP391.41

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