Study on a full field of view laser scanning system
Study on a full field of view laser scanning system
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DOI：
10.1016/j.ijmachtools.2006.02.015
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发表时间：
2007-01-01
影响因子：
14
通讯作者：
Jin, Ming
中科院分区：
文献类型：
--
作者：
Xie, Zexiao;Wang, Jianguo;Jin, Ming
为了满足逆向工程中对大型零件进行精确、方便的三维测量的要求，提出了一种由CCD摄像机、振镜和激光投影仪组成的全视场扫描系统。首先根据世界坐标系与计算机图像的映射关系建立摄像机模型。采用刻有正方形图案的平面靶标对相机进行标定。根据交比不变性原理，从正方形图像中提取校准点，同时获得镜头的失真系数。利用这些点对摄像机模型中的未知参数进行求解。为了得到激光平面中点的三维坐标，根据检流计的角度和靶面上的相贯线计算激光平面的方位和位置。根据激光的方位和位置，一个点在激光平面上的三个坐标可以用其中的两个坐标来表示。因此，可以从摄像机模型直接获得两个坐标。实验表明，所研制的系统具有较好的精度。它可以在很大程度上识别细微结构，而且携带方便，便于现场测量。(C)2006爱思唯尔有限公司。保留所有权利。
To meet the requirement of accurate and convenient 3-D measurement for some large parts in reverse engineering, a full field of view scanning system that is mainly composed of a CCD camera, a galvanometer and a laser projector is proposed in this paper. The camera model is firstly established according to the mapping between the world coordinate system and the computer image. A planar target engraved with square patterns is adopted to calibrate the camera. Based on the rule of cross-ratio invariability, the calibration points are extracted from the square patterns and the lens distortion coefficients are simultaneously acquired. The unknown parameters in camera model are solved using these points. For obtaining the 3-D coordinate of a point in a laser plane, the orientation and position of the laser plane are computed according to the angle of the galvanometer and the intersected lines on the target. And based on the laser orientation and position, the three coordinates of a point in the laser plane can be represented by two of them. Hence, two coordinates can be directly obtained from the camera model. Experiments show that the developed system possesses good accuracy. It can identify the fine structure on a large part, also it is portable and convenient for field measurement. (C) 2006 Elsevier Ltd. All rights reserved.