基于分离参数标定的鱼眼镜头成像模型研究

鱼眼图像具有大视场角,但在应用方面存在严重畸变,为了探索鱼眼镜头的成像规律,本文提出一种基于分离参数标定的鱼眼镜头成像模型研究方法。对相机的物理参数进行分离标定,设计靶标,拟合径向、切向畸变系数,从而得到鱼眼镜头成像模型。比较由成像模型反推出的物点与真实物点的位置,实验结果表明,经本文提出的成像模型得到的成像点与真实物点的入射角和偏移角的误差均值分别为0.011 5和0.019 4。采用基于分离参数标定的鱼眼镜头成像模型研究方法可以较好地反映鱼眼镜头的成像规律,为更广泛地应用鱼眼镜头奠定基础。

Research on Fisheye Lens Imaging Model Based on the Separated Parameters Calibration

With large field of view, fisheye images have serious distortion in application. To explore the imaging principles of fisheye, a research on fisheye lens imaging model based on the separated parameters calibration was proposed. Physical parameters were calibrated separately. Designing targets, the radial and tangential distortion coefficients were fitted out. Thereby the fisheye lens imaging model was obtained. Comparing the object point calculated by the imaging model with its true location, the average error of incident angle is 0.0115 and the average error of offset angle is 0.0194. Thus this imaging model based on the separated parameters calibration can preferably reflect the imaging principles of fisheye, and lay the foundation for further applications of fisheye lenses.