彩色条纹投影运动物体三维测量方法

Three-Dimensional Shape Measurement of Moving Object with Color Fringe Projection

相移法广泛应用于条纹投影轮廓术,可以实现静态物体的高精度三维测量。然而物体运动会改变相邻条纹间的相移量,进而引入周期性的运动误差。针对上述问题,提出一种基于彩色条纹投影的运动物体三维测量方法。该方法将余弦条纹和正弦条纹分别编码至彩色图像的红色通道和蓝色通道,然后利用相移算法从两个颜色通道中提取两个具有反向运动误差的相位图,最后通过计算平均相位图补偿周期性运动误差,并进一步分析了颜色串扰对该方法的影响。仿真和真实试验结果均表明,所提方法能够有效地抑制运动误差,实现准确的运动物体三维测量,而且受颜色串扰影响较小。

Phase-shifting profilometry(PSP)is a well-established technique for the accurate measurement of three-dimensional(3D)shapes.Nonetheless,it faces a significant challenge when the object under study experiences motion,as this can alter the phase-shifts between adjacent fringes,introducing periodic errors known as motion-induced errors.A three-dimensional measurement method for moving objects based on color stripe projection is proposed to address the above issues.This method encodes cosine and sine fringes into the red and blue channels of color images,respectively.Then,a phase shift algorithm is used to extract two phase maps with reverse motion errors from the two color channels.Finally,the average phase map is calculated to compensate for periodic motion errors,and the impact of color crosstalk on this method is further analyzed.Both simulation and real experimental results show that the proposed method can effectively suppress motion errors,achieve accurate three-dimensional measurement of moving objects,and is less affected by color crosstalk.