基于区域量化算法的增强型双频解相位方法

Enhanced Dual-Frequency Phase Unwrapping Method Based on Regional Quantification Algorithm

针对传统双频法无法满足高精度测量要求的问题,提出了一种基于区域量化算法的增强型双频解相位方法。该方法首先通过双频法获得不稳定的条纹阶次,然后通过区域灰阶图对条纹阶次进行区域划分,再对每个区域中全部像素点对应的条纹阶次进行排序并取中位值,最后将取得的中位值赋值给该区域所有的像素点对应的条纹阶次。经过量化后的条纹阶次是唯一稳定的,因此该方法能够获得精确的绝对相位。仿真和实验结果证明了所提方法的可行性。与传统双频法和三频法相比,所提方法在达到双频法测量速度的同时,能够达到三频法测量的精度。

To solve the problem that the traditional dual-frequency method cannot meet the requirement of high precision measurement,an enhanced dual-frequency phase unwrapping method based on the regional quantification algorithm is proposed.In this method,unstable fringe orders are first obtained by the dual-frequency method,and the fringe orders are divided by the regional gray-code map.Then,the fringe orders corresponding to all the pixels in each region are sorted and the median value is obtained.Finally,the obtained median value is assigned to the corresponding the fringe orders of all pixels in this region.The quantified fringe order is unique and stable,so the method can obtain accurate absolute phases.Simulation and experimental results demonstrate the feasibility of the proposed method.Compared with the traditional dual-frequency method and three-frequency method,the proposed method reaches the measurement speed as that of the dual-frequency method and the measuring precision as that of the three-frequency method.