Juarez-Salazar Rigoberto, Zheng Juan, Diaz-Ramirez Victor H
Appl Opt. 2020 Dec 20;59(36):11310-11318. doi: 10.1364/AO.412159.
Camera modeling and calibration are essential tasks in modern optics. Conventionally, the pinhole model is adopted with a further extension for lens distortion. However, pinhole and distortion models are mutually dependent; thus, the standard approach induces systematic camera calibration errors. This research presents a unifying distorted pinhole camera model that includes a telecentric, distortion-free pinhole, and radial lens distortion as particular cases. An iterative calibration method based on the derived distorted pinhole model is proposed, and experimental evaluation by calibrating a camera with high radial distortion is performed. The calibration results are compared with the standard and fisheye models using a well-known commercial camera calibrator software. The proposed method outperforms the standard model and achieves accuracy comparable to the fisheye model, and the proposed approach is a versatile and accurate tool for diverse optical metrology applications.
相机建模与校准是现代光学中的重要任务。传统上，采用针孔模型并对镜头畸变进行进一步扩展。然而，针孔模型和畸变模型相互依赖；因此，标准方法会导致系统性的相机校准误差。本研究提出了一种统一的畸变针孔相机模型，该模型将远心、无畸变针孔和径向镜头畸变作为特殊情况包含在内。提出了一种基于推导得出的畸变针孔模型的迭代校准方法，并通过校准具有高径向畸变的相机进行了实验评估。使用一款知名的商业相机校准软件将校准结果与标准模型和鱼眼模型进行了比较。所提方法优于标准模型，并且实现了与鱼眼模型相当的精度，所提方法是用于各种光学计量应用的通用且精确工具。
