摘要
用隔行扫描摄像机采集到的运动物体单帧变形条纹测量三维位移和速度.该方法将一帧变形条纹分成两个单场,利用傅里叶变换轮廓术重建三维面形,从单场条纹的调制度中提取二值化模板,计算质心获得亚像素匹配定位点,通过双三次插值和标定,实现了一个场周期时间内三个维度上的位移和平均速度的测量.匀速运动物体实验结果表明:被测速度的最大绝对误差为0.6 mm/s,相对误差为0.57%.该方法仅用一帧变形条纹即可测量运动物体的三维位移和速度,提高了时间分辨率和测量准确度.
3D displacement and velocity were measurd by using a single frame fringe which is recorded by an interlaced scanning camera for a moving object.One frame deformed fringe is operated by dividing into two single field fringes,reconstructing 3D surface shapes by directly using Fourier transform profilometry,extracting 2D binarization templates from the modulation of single fields,computing the centroid to get sub-pixel locating point,and processing the shape data by bi-cubic interpolation and calibration,it can accomplish the measurements of 3D displacement and 3D average velocity within the interval of a field period time.In the 3D space experiment with constant velocity of a 3D object,the maximum absolute error of measured velocity is 0.6mm/s,and the relative error is 0.57%.This method needs only one frame deformed fringe to measure 3D displacement and velocity,and improves temporal resolution and measuring precision.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2016年第8期122-127,共6页
Acta Photonica Sinica
基金
国家科技重大专项(No.2009ZX02204-008)
国家高技术研究发展计划(No.2007AA01Z333)资助~~
关键词
测量
三维位移
三维速度
傅里叶变换轮廓术
亚像素定位
隔行扫描
Measurement
3D displacement
3D velocity
Fourier transform profilometry
Sub-pixel localization
Interlaced scanning
