基于单帧图像的物体面内位移和速度测量  

In-plane displacement and velocity measurement of a moving object based on a single frame image

作　　者：曹森鹏[1,2] 曹益平[1] 

机构地区：[1]四川大学光电系,四川成都610065 [2]平顶山学院电气与机械工程学院,河南平顶山467000

出　　处：《光电子．激光》2016年第11期1181-1185,共5页Journal of Optoelectronics·Laser

基　　金：国家科技重大专项(2009ZX02204-008);国家"863"计划(2007AA01Z333)资助项目

摘　　要：为了实现单帧图像检测物体两个运动状态的目的,提出了一种利用隔行扫描摄像机采集单帧图像测量物体在远动平面内的位移和速度的新方法。隔行扫描方式的摄像机采集在平面内运动物体的一帧图像,是由相隔一个场周期时间采集的奇场和偶场图像组成,每个单场图像经过傅里叶变换去隔行算法处理,获得与单场对应的帧图像质量相当的去隔行图像。根据物体与背景对光的反射率不同,提取物体的轮廓获得二值化模板,计算质心获得亚像素的定位精度,通过标定获得匹配点的空间坐标,进而计算在一个场周期时间内的位移和平均速度。对面内匀速运动物体的实验中,被测速度的最大绝度误差为0.35mm/s,相对误差为0.78%。实验结果证明本文方法的有效性。For detecting two motion states of a moving object in a single frame image,a nov el method is proposed for in-plane displacement and velocity measurement based on a single frame image by using an interlaced scanning camera.One frame image is recorded by a n interlaced scanning camera for a in-plane moving object,and is composed of odd and even field images during a recording interval of one field period,each of which is operat ed by Fourier transform de-interlacing a lgorithm,and the quality of de-interlaced image is identical with that of the corresponding frame image of the single fiel d.According to the different reflectivities of the object and background,the object′s outline is extracted from each de-inte rlaced image to obtain binary template,which is operated to compute the centroid to get sub-pixel location precision.The two matching points are calibrated to obtain the space coordinates,and displacement and average vel ocity are calculated in one field period.In the experiment for an object with in-plane constant velocity,t he maximum absolute error of measured velocity is 0.35mm/s,and the relative error is 0.78%.The results demo nstrate that the method can effectively measure in-plane displacement and veloc ity.

关 键 词：位移测量 速度测量 傅里叶变换去隔行 隔行扫描 摄影测量 亚像素定位 

分 类 号：TN247[电子电信—物理电子学]