一种大场景下的棋盘靶标角点自动定位算法

针对棋盘图案，提出一种亚像素精度的角点自动定位算法．该算法采用由粗到精的分层次检测策略，首先通过投影算法自动定位靶标图像中棋盘子图像的大致位置；其次在棋盘子图像中进行Hough变换，并根据角度投影图和幅值投影图进行棋盘角点的初步定位；最后在初步定位的角点邻域内通过高斯灰度插值和Harris算法得到最终的亚像素精度的角点位置．此外，本文还利用Hough变换提取的直线对角点进行自动排序．实验结果表明，该算法自动化程度较高，能够在大场景中自动定位靶标及其角点位置，而且精度较高，适用于大场景环境下畸变较小的摄像机的标定．

An Automatic Location Algorithm for Chessboard Target Corners in Wide Background Environments

An automatic corner location algorithm with sub-pixel precision is proposed for chessboard pattern images.The coarse-to-fine layered detection scheme is used.Firstly,with the projection algorithm,the approximate position of chessboard sub-image in target image is located automatically.Secondly,Hough transformation is used in the chessboard sub-image, and the chessboard corner is preliminarily located according to the angle projection image and the amplitude projection image.Lastly,in the coarse corner area ...