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Study on3D Measurement Method for360Degrees Object

Author: LiuChunQiu
Tutor: YuanHuiJuan
School: Harbin University of Science and Technology
Course: Signal and Information Processing
Keywords: 3D measurement 3D merge least-square method Hough ellipses test
CLC: TP391.41
Type: Master's thesis
Year: 2012
Downloads: 39
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Abstract


To obtain the3D map including depth information is one of the key theory andtechnology in machine vision field. The3D measurement is to get the depth image ofobjects that contains depth information through various methods, thus obtains the3Dinformation of object such as to achieve the purpose of cognitive world. Now3Dmeasurement has a variety of methods. We focused on structured light spatial encodingmethod, because for3D information acquire of the objects, only one image is needed tobe captured by the camera with this method, so it has some advantages such as easyimplementation and fast measurement. And because the camera’s view was limited orthe surface of objects was covered, we can’t get the whole information of surface fromone picture. In order to realize360degrees of3D measurement objects, objects are bemeasured from different angles or different regions and local measurement data ismerged by3D image merge.This paper uses the method of color stripes permutation encoding to achieve3Dmeasurement of local objects. Based on this, two images merge using marked pointmerge and least-square method. The marked point of ellipse is putted in overlappingareas of two images and tested with Hough ellipse test that get the center of ellipse. Thecoordinate transition matrix is calculated by least-square method. Local coordinatessystem is changed to global coordinates system through coordinate transition matrix. Atlast,360degrees of3D measurement objects is completed. In the process of merging，the questions that choose the sharp of marked point and improve the method of Houghellipse test.The system of3D measurement is designed in this paper. The simulationexperiments of cylinder are performed in3ds max. In this paper, the results ofexperiments show that, the system of3D measurement and the methods of3D mergeare feasible.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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