摘要
结构光3D测量的关键问题之一是准确地确定图像采样点并求其投射角。提出一种以时序向被测表面投射Gray码和线移条纹进行编码,以亚像素定位技术提取Gray码条纹边缘和线移条纹中心,将其上点作为图像采样点进行解码的方法。消除了Gray码固有的一位解码误差对投射角求取的影响,同时提高了采样密度。文中具体介绍该方法的编码解码原理,分析了编码图案正交投射对测量准确度的影响,给出了仿真实验结果。测量误差约为0.04%。
A key problem in structured-light-based 3D measurement is to acquire image sampling points and calculate their projecting angle accurately. A new scheme is presented, which carries out encoding by projecting Gray code and line-shift fringes in time sequence, and decoding by sub-pixel located image sampling points on Gray code fringe edges and line-shift fringe centers. The influence of inherent Gray code one-bit decoding error to calculating projecting angle is removed; at the same time, the sampling density is increased. The encoding and decoding prineipie, analysis on orthogonal projecting, simulation experimental results are presented. Measurement error is about 0.04%.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2008年第4期701-704,共4页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(60572030)
教育部博士学科点专项科研基金(20050214006)
黑龙江省教育厅海外学人资助项目(1055HZ027)
哈尔滨市科技攻关计划(2005AA1CG152)
黑龙江省研究生创新科研资金(YJSCX2005-238HLJ)资助项目
关键词
3D测量
结构光
GRAY码
线移
3D measurement
structured light
Gray code
line-shift
