基于构造边的精确快速相位解缠算法  

An accurate and fast phase unwrapping algorithm based on constructed edge

作　　者：陆军[1] 李积江[2] 王成成[1] 夏桂华[1] 

机构地区：[1]哈尔滨工程大学自动化学院,黑龙江哈尔滨150001 [2]中兴通讯股份有限公司,陕西西安710174

出　　处：《光电子．激光》2015年第1期122-129,共8页Journal of Optoelectronics·Laser

基　　金：中央高校基本科研业务费专项基金(HEUCFX41304);黑龙江省自然科学基金(F201123);人力资源和社会保障部留学人员科技活动择优资助项目

摘　　要：针对复杂包裹相位图普遍存在相位跳变和解缠耗时的情况,设计了一种高精度快速的相位解缠算法。首先通过三步相移法得到包裹相位图,由包裹相位图计算产生质量图;再由相邻两像素点的质量值构造水平与竖直权值边,根据构造边权值的大小作为路径引导进行相位解缠,解缠过程以两像素点所构成边为单位,采用不连续解缠路径,逐次解缠所有像素点,有效降低了区域不连续、测量遮挡和环境噪声对解缠精度的影响,而且通过一次排序即可确定解缠顺序,提高了解缠效率;最后,结合本文构造权值图的特点,对算法进一步优化,剔除了冗余的权值边,加快了解缠的速度。通过对比不同算法的解缠结果表明,本文提出的算法具有较快的解缠速度和较高的精度。For complex wrapped phase image, phase usually changes drastically and phase unwrapping computing is very time-consuming. In this paper, a fast and accurate unwrapping algorithm is designed to solve these problems. Firstly, the wrapped phase image is obtained through the three-step phase shift method. The quality map is calculated according to the wrapped phase. Then, the horizontal and vertical weight edges are constructed by using two neighboring pixels＇ quality value. The phase unwrapping path is guided by weight value of constructed edges. The unwrapping procedure uses two pixels as a unit. All the pixels are unwrapped successively by using a discontinuous path. The proposed algorithm in this paper can reduce the influence of region discontinuities, measurement occlusion and ambient noise on unwrapping accuracy effectively. Only by sorting all edges once, the order of phase unwrapping can be determined. So the efficiency of unwrapping phase is improved significantly. We also make further optimization on the unwrapping algorithm according to the characteristics of constructed weight graph. By this way,the redundant edges are removed. It can rapidly speed up the unwrapping process. Through the comparison of experiment results with other algorithms, it indicates that the proposed algorithm is faster and more accurate.

关 键 词：测量 相位解缠 路径引导 质量图 相位测量 结构光 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]