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为了消除透视变换过程中产生的圆心偏差,基于交比不变和配极对应原理,提出了一种利用同心圆目标精确定位圆心在图像中的真实投影点的方法。首先介绍相关的理论基础,然后详细介绍了算法的实现步骤,最后通过仿真和真实图像实验验证算法的正确性以及影响圆心定位精度的因素。实验结果表明,本文算法可以稳定、准确地获取圆形目标的真实投影点,且投影点的定位精度要优于0.2pixel,相较椭圆拟合法具有明显的精度优势;同时,本文算法仅包含简单的线性运算,因此具有较高地运算效率。由于本文算法对摄像机和同心圆的物理参数无任何要求,因此具有应用广泛的特点。
In order to eliminate the center deviation caused by the perspective transformation, a method of using the concentric circle target to locate the true projection point of the circle center in the image is proposed. First of all, introduce the relevant theoretical foundation, and then introduce the steps of the algorithm in detail. At last, we verify the correctness of the algorithm and the factors that affect the accuracy of the centering of the center by simulation and real image experiments. The experimental results show that the proposed algorithm can acquire the true projection points of a circular target stably and accurately, and the positioning accuracy of the projection points is better than 0.2pixel, which has obvious advantages over the elliptic fitting method. At the same time, the proposed algorithm contains only simple Of the linear operation, it has higher computational efficiency. Since the algorithm in this paper does not require any physical parameters for cameras and concentric circles, it has a wide range of applications.