Flexible Calibration Method for 3D Laser Scanner System简

In this paper, a flexible high-precision calibration method suitable for industrial field was proposed. The complexity of the coordinate transformation was simplified by choosing the camera coordinate system as the unified reference coordinate system. A flexible planar calibration pattern was introduced to the calibration process, which can be arbitrarily placed and from which the known feature points can be extracted to construct other unknown feature points. With the known intrinsic parameters, the laser projector plane equation was fitted by the multi-noncollinear points, which were acquired through the principle of triangulation and the projective invariance of cross ratio. With this method, the strict alignment and multiple times of coordinate transformation can be avoided. Experimental results showed that the arithmetic mean of the root mean square （RMS） error of distance was 0.000 7 mm.     

基于特征点匹配的视频图像实时拼接系统

提出了一种基于尺度不变特征变换算法的视频图像实时拼接方法。首先,用等焦距柱面变换对待拼接的图像进行处理,使相邻摄像机所拍摄的图像帧投影在同一柱面上;然后,优化k-d树的最近邻算法提高了特征点匹配的速度;最后,随机采样一致性算法剔除了错误的匹配点,提高了匹配的准确性,并得到投影变换矩阵进行多摄像机图像帧拼接。实验结果表明,与传统的图像拼接算法相比,该方法极大地提高了视频图像拼接的鲁棒性,实现了视频图像的实时拼接。     

基于视觉测量激光焊接复杂焊缝跟踪控制

为实现激光焊接复杂焊缝的精确跟踪,利用视觉传感器,构建了拼接焊缝的测量系统,给出了测量计算焊缝中心线、宽度及曲面法矢信息的方法,给出了测量坐标系到摄像机坐标系的变换关系,规划了焊枪行走路径。并且进行了复杂焊缝的跟踪实验。实验表明,研究的基于视觉测量激光焊接复杂焊缝跟踪控制系统,能够满足三维激光焊接的跟踪控制要求。     

平面曲线段绕定直线旋转所产生旋转体的体积及旋转曲面面积

本文利用逆坐标变换公式导出了平面曲线段绕直线旋转所产生旋转体体积及旋转曲面面积的计算公式,结构简单,易于记忆,具有一定实用价值。     

民用飞机通信距离及方位试飞方法研究

介绍了民用飞机通信距离及方位的试飞方法及数据处理方法,以甚高频通信系统和甚高频全向信标系统为例,详细说明了试飞航线的设计,试飞方法,GPS数据坐标变换的必要性及方法,及基准数据与机载数据的二次处理方法。同时还对距离和方位试飞时需要注意的事项进行了说明。本文可为民用飞机试飞可提供科学、有益的参考,具有一定的借鉴作用。