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由于滤波过程的影响,从复合半纹像中解调出的各帧变形条纹间的相移量发生了改变,采用传统正交复合三维测量方法中的相位算法进行解相会导致较大的相位误差,提出一种对条纹间相移量进行校准以提高正交复合光三维测量精确度的标定方法。首先从参考平面的复合光栅像中解调获得各帧相移正弦条纹,通过频域滤波的方法获取条纹的基频分量,计算出各帧正弦条纹相对于第1帧正弦条纹的相移量;然后在实物测量时以此相移量对解调出的各帧变形条纹间的相移量进行校准,建立了新的三维测量的数学模型。实验数据表明,本文提出的方法有效抑制了滤波过程导致的解相误差,将系统的测量精确度提高了将近1倍。
Due to the influence of the filtering process, the phase shift amount between the deformation fringes of the frames demodulated from the composite half-texture changes. The phase algorithm in the traditional orthogonal composite three-dimensional measurement method results in a larger phase In order to improve the accuracy of three-dimensional measurement of orthogonal composite light, a calibration method was proposed to calibrate the phase shift between fringes. Firstly, the phase fringe sine fringes of each frame are demodulated from the reference plane composite grating image, and the fundamental frequency components of the fringes are obtained by frequency domain filtering to calculate the phase shift amount of the sine fringes of each frame relative to the sine fringes of the first frame. Then the amount of phase shift is used to calibrate the amount of phase shift between the deformed fringes during the actual measurement, and a new mathematical model of three-dimensional measurement is established. Experimental data show that the proposed method effectively restrain the phase error caused by the filtering process and improve the measurement accuracy of the system by nearly a factor of two.