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为快速方便地获取直升机旋翼动态三维坐标,提出了一种基于编码标记点和立体视觉的旋翼动态三维测量方法,该方法首先采用平面标定法及Bouguet校正算法实现立体标定和图像校正;其次,依据标记点形状和灰度特征,采用图像二值化和连通域标记等方法检测并定位编码标记点的中心,确定标记点像素坐标;然后,采用邻域扫描法对编码点进行解码,得到标记点的码值,并依据码值实现左右视图中同名标记点匹配;最后,利用投影方程求出标记点三维坐标,实现直升机旋翼动态三维测量。仿真实验结果表明该方法精度高,实际测量误差不超过0.3mm,可满足旋翼动态三维测量的要求。
In order to obtain the dynamic three-dimensional coordinates of helicopter rotors quickly and conveniently, a three-dimensional dynamic rotor measurement method based on coded points and stereoscopic vision is proposed. Firstly, the calibration method and the Bouguet calibration algorithm are used to calibrate and correct the images. Secondly, The shape and the gray level of the mark, the method of image binarization and connected domain mark and other methods to detect and locate the center of the coded mark point to determine the pixel coordinates of the mark point; then, using the neighborhood scanning method to decode the code point, the mark point , And match the markings of the same name in the left and right views according to the code value. Finally, the 3D coordinates of the mark points are obtained by using the projection equation to realize the dynamic three-dimensional measurement of the helicopter rotors. Simulation results show that the method has high precision and the actual measurement error does not exceed 0.3mm, which can meet the requirements of dynamic three-dimensional rotor measurement.