基于调制度分析的快速三维物体识别方法  

A Fast Three-Dimensional Object Recognition Based on Modulation Analysis

作　　者：王莹[1] 苏显渝[1] 

机构地区：[1]四川大学电子信息学院光电系,四川成都610064

出　　处：《光学学报》2010年第3期720-726,共7页Acta Optica Sinica

基　　金：国家自然科学基金(60838002)资助课题

摘　　要：提出了一种基于调制度分析的快速三维物体识别方法。将两个有一定间距且正交的光栅同时投影到被识别物体表面上,使被识别物体位于两个光栅正焦像面之间,从同一方向获取被物体高度信息调制的正交光栅像,而物体的高度信息就被编码在这个图像中。采用傅里叶变换和空间频域分析,可分别得到两个方向上的基频。然后计算识别参数(每个基频强度的和)的值,识别参数值可以被看作是二维识别空间的一个点,对于不同形状的物体,识别参数值是不同的,所以不同物体的识别参数将对应识别空间不同的位置。计算机模拟实验和实际物体的识别实验证明了此方法的有效性。A novel method for the three-dimensional（3-D） object recognition based on modulation analysis is proposed.Two orthogonal gratings with equal interval are vertically projected on an object surface,and the measured object is placed between the focusing planes of the two gratings.Then the image of orthogonal grating modulated by the object height can be obtained by a CCD camera from the same direction,and the object height information is encoded in this image.They are processed by the operations consisting of performing the Fourier transform,spatial spectrum analysis,so the fundamental spectrum in two directions can be obtained.Then the recognition parameter （the sum of the intensity of each fundamental spectrum） is calculated.The values of recognition parameter are treated as a point in the recognition space.If the shape of object is different,the values of recognition parameter are also different.The different objects will be shown in the different positions because of the deference of the values of recognition parameter.Both computer simulation and experimental results are presented in support of the proposed idea.

关 键 词：三维物体识别 调制度测量 条纹分析 傅里叶变换 识别参数 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]