相位偏移gamma矫正方法的结构光三维视觉测量技术

摘要

为补偿结构光三维测量过程中的非线性gamma误差,提出基于相位偏移的gamma误差矫正算法,对三维结构光视觉测量与重构技术进行了研究.首先,对结构光测量的基本原理和基于正弦条纹光栅的结构光测量方法做了介绍;其次研究了基于相位偏移方法的gamma矫正方法,通过实验对矫正方法的有效性进行了验证;最后通过三维重构实验得到被测量的物体矫正前后的三维重构图像,并且对其进行分析对比.实验结果表明,设计的矫正算法有效降低了三维测量中gamma畸变造成的相位误差的均方根值,提高了测量精度,具有实用价值.%To compensate for the nonlinear gamma error in the process of structured light 3D( three-dimensional) measurement, the gamma correction method based on the phase shift method is proposed in this paper. The technologies of structured light measurement and the 3D reconstruction are studied. Firstly, introduce the basic principles of structured light measurement and structured light measurement method based on sinusoidal fringe image. Secondly, the gamma correction method based on the phase shift method is studied, and the validity of the method is verified by experiments. Finally, the 3D reconstruction images before and after correction of the measured object are obtained through reconstruct experiment, and the analysis and comparison are made. The experimental results show that the correction algorithm designed in this paper can effectively reduce the RMS( root-mean-square) value of the phase error caused by gamma distortion in three-dimensional measurement. This method improves the measurement accuracy and has practical value.