摘要
相位测量轮廓术是获取物体表面三维形貌信息的最有效方法之一,但是对于表面反射率变化较大的物体,传统的条纹投影技术难以使高反射率和低反射率的区域都能实现高精度的形貌测量。针对这一问题,提出一种基于递归的自适应条纹投影方法。该算法能够分析采集图像中亮度饱和及亮度不足的像素点,并根据坐标映射关系自适应地调整投影图案的亮度,使各像素投影亮度经二分递归后趋近于最佳投影亮度,达到避免饱和及提高信噪比的目的。实验结果表明,所提方法能够准确实现投影亮度的调整,仅需少量的递归过程,就能纠正99.3%投影亮度不合理的像素点,在改善高动态范围表面的三维显示效果的同时提高了其三维形貌的测量精度。
Phase-measuring profilometry is one of the most effective methods of obtaining the three-dimensional topography information of the object surface. However, in terms of objects with large changes in surface reflectivity, it is difficult for traditional fringe projection technology to achieve high-precision topography measurement in both high reflectivity and low reflectivity regions. To solve this problem, we propose a recursive adaptive fringe projection method. This method can analyze the pixels with saturated and insufficient brightness in the collected image and adjust the brightness of the projected pattern adaptively according to the coordinate mapping relationship. Then, the projection brightness of all the pixels would be recursively driven to approach the best projection brightness so as to avoid saturation and improve the signal-to-noise ratio. The experimental results show that the proposed method can accurately adjust the projection brightness. Only a small amount of recursion is required to correct 99.3% of pixels with unreasonable projection brightness. In addition to improving the three-dimensional display effect of the high dynamic range surface, this method has also enhanced the measurement accuracy of the three-dimensional topography.
作者
汪锦航
卢荣胜
刘端茂
Wang Jinhang;Lu Rongsheng;Liu Duanmao(School of Instrument Science and Opto-Electronics Engineering,Hefei University of Technology,Hefei,Anhui 230009,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2021年第19期137-146,共10页
Acta Optica Sinica
基金
国家重点研发计划(2018YFB2003801)
国家自然科学基金(51875164)。
关键词
测量
相位测量
高动态范围
亮度饱和
递归
自适应调整
measurement
phase measurement
high dynamic range
brightness saturation
recursion
adaptive adjustment
