High-accuracy calibration of low-cost camera using image disturbance factor
High-accuracy calibration of low-cost camera using image disturbance factor
复制标题
利用图像扰动因子对低成本相机进行高精度标定
DOI：
10.1364/oe.24.024321
复制
发表时间：
2016-10-17
期刊：
影响因子：
3.8
通讯作者：
Yin, Yang
中科院分区：
文献类型：
--
作者：
Liu, Zhen;Wu, Qun;Yin, Yang
非工业用低成本摄像机具有价格便宜、结构简单等优点，但存在分辨率低、图像噪声大等缺点。现有的摄像机标定方法在标定非工业用低成本摄像机时，无法获得高精度的标定。针对这一问题，提出了一种利用高精度平面靶进行高精度标定的方法。首先利用多尺度图像分析方法确定图像特征点的初始值和不确定度;然后，将图像干扰因子添加到每个目标图像特征点。此外，根据目标平面与像平面之间的单应矩阵，将图像投影误差建立为最小目标函数。因此，所有图像特征点的最佳坐标是通过非线性优化方法获得的。最后，根据前一步得到的图像特征点，利用张氏方法实现摄像机内外参数的标定。仿真实验和真实的实验结果表明，该方法的标定精度至少是Zhang方法的3倍。(C)2016美国光学学会
Nonindustrial low-cost cameras have the advantages of cheap and simple structure, but have the disadvantages of low resolution and large image noise. When the existing camera calibration methods are used to calibrate nonindustrial low-cost cameras, high-accuracy calibration cannot be obtained. A high-accuracy calibration method using a high-accuracy planar target is introduced in this study to solve this problem. First, the initial values and the uncertainties of all image feature points are determined by the multiscale image analysis method. Then, the image disturbance factor is added to each target image feature point. In addition, the image projection error is established as the minimum objective function according to the homography matrix between the target plane and the image plane. Thus, the optimal coordinates of all image feature points are obtained by the nonlinear optimization method. Finally, the calibration of the intrinsic and extrinsic parameters of the camera will be achieved by using Zhang's method according to the image feature points obtained from the previous step. Simulative and real experiments have been conducted to evaluate the performance of the proposed method, and results show that the calibration accuracy of the proposed method is at least three times that of Zhang's method. (C) 2016 Optical Society of America