ABSTRACT In this paper, a stereo calibration method for binocular ultra-wide angle long-wave infrared camera is proposed on the basis of an equivalent small field of view camera. Extrinsic parameters are calibrated through the corrected images from the left and right cameras. They can be viewed as images taken by a small field of view camera. The calibration procedure consists of three steps: monocular calibration, distortion correction and extrinsic parameters calibration. In order to evaluate the accuracy of the method, stereo vision of the camera is modelled and a 3D reconstruction approach is presented. A series of experiments, including intrinsic parameters, extrinsic parameters and 3D reconstruction, are conducted to validate the proposed method. The results show that the baseline length error decreases to 0.67%, and the relative error for the 3D reconstruction of corners is smaller than 8.11%. In contrast to the common stereo calibration method, it improves calibration accuracy.

中文翻译：

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基于等效小视场相机的双目超广角长波红外相机立体标定

摘要 本文在等效小视场相机的基础上，提出了一种双目超广角长波红外相机的立体标定方法。外部参数通过来自左右摄像机的校正图像进行校准。它们可以被视为由小视野相机拍摄的图像。标定过程包括三个步骤：单目标定、畸变校正和外参标定。为了评估该方法的准确性，对相机的立体视觉进行建模，并提出了一种 3D 重建方法。进行了一系列实验，包括内在参数、外在参数和3D重建，以验证所提出的方法。结果表明，基线长度误差降低到0.67%，角点3D重建的相对误差小于8.11%。与普通的立体校准方法相比，它提高了校准精度。