剪切波变换和条纹方向二值掩膜的相位解包裹方法

Phase unwrapping method of shearlet transform and fringe-orientation binary mask

针对条纹投影轮廓术中相位解包裹问题,采用改进的加权最小二乘方法实现了带有阴影和相位不连续的条纹图相位解包裹。提出的方法是利用剪切波变换去除条纹图的背景和噪声,通过引入条纹方向二值掩膜来定义新的加权系数,该加权系数可以准确地区分包裹相位图中连续区域和不连续区域。将提出的新方法应用到模拟和实验获得的条纹投影静态和动态测量过程中,并与5种常用的相位解包裹方法进行比较。实验结果表明,本文提出的新方法能够有效地限制不连续引起的误差传递。

In order to solve the phase unwrapping problem in fringe projection profilometry,an improved weighted least squares method is used to realize phase unwrapping of fringe images with shadows and phase discontinuities The proposed method uses shearlet transform to remove the background and noise of fringe images and introduces a binary mask of fringe orientation to define a new weighting coefficient,which can accurately distinguish continuous and discontinuous regions in the wrapped phase image.The proposed method was applied to the static and dynamic measurements of fringe projection simulated and obtained from experiments.It was compared with five commonly used methods.The experimental results demonstrate that the proposed method can effectively limit the error propagation caused by discontinuity.