基于彩色复合光栅投影的三维轮廓测量方法  

Three-dimensional Profile Measurement Based on Bicolor Composite Grating

作　　者：程音[1] 于德敏[1] 许增朴[1] 王永强[1] 

机构地区：[1]天津科技大学机械工程学院,天津300222

出　　处：《计算机测量与控制》2008年第9期1256-1258,1265,共4页Computer Measurement &Control

基　　金：天津市自然科学基金资助项目(013602211)

摘　　要：在测量同时含有轮廓突变与梯度较大的物体时,受被测物体高度变化引起的非截断相位变化与背景分量的影响,相位则很难正确展开;对此采用彩色复合光栅投影的三维轮廓测量方法:即用软件生成含有两种不同颜色的彩色光栅,其中每种颜色分量的光栅又具有两种不同的频率,通过LCD投影仪投射到物体表面,这样只需一次采集,就能消除图象背景分量对测量的影响,在扩大测量范围同时可达到以往双频技术中多次采集的测量突变效果;最后通过分析变形光栅中频谱混叠问题以及计算机模拟和实验验证,证实了该方法的可行性。While the detected object contain depth discontinuities and large gradient, it is difficult to unwrap the wrapped--phase correctly because of the interrupted phase caused by height variations and background spectrum. So we bring a novel technique based on color com- posite grating, which contain two different colors and each color grating contain two different frequencies, generated by computer software. Through LCD projector project grating to the object＇s surface, it will be able to eliminate background spectrum through capture only one deformed grating, expanding the scope of measurement and solving the problem of the interrupted phase. The method, simulation result and an example of three dimensional shape measurement show and good agreement is found.

关 键 词：三维轮廓测量 彩色复合光栅 傅立叶变换 相位展开 

分 类 号：TP277[自动化与计算机技术—检测技术与自动化装置]