Chen Yichao, Huang Fu-Yu, Shi Feng-Ming, Liu Bing-Qi, Yu Hao
Appl Opt. 2019 Feb 1;58(4):744-751. doi: 10.1364/AO.58.000744.
A method is proposed to calibrate the long-wave infrared ultra-wide-angle camera in this paper. In addition, a novel calibration chessboard is designed and an advanced chessboard corner positioning method is adopted to improve the calibration precision. The designed calibration chessboard can achieve high thermal infrared contrast and exhibits outstanding stability, which is made of a thermoelectric semiconductor refrigeration device. The proposed subpixel corner positioning method can accurately locate the corners on the calibration chessboard according to the characteristics of the infrared image and the checkerboard pattern. Both the principle of the proposed infrared chessboard and the subpixel corner positioning procedure were presented, and the calibration experiment showed that the mean reprojection error and the root mean square error were reduced to 0.32 pixel and 0.39 pixel, respectively. Comparison studies were also performed to verify the calibration effect of the proposed method, and the possibilities of camera calibration error of the proposed method were analyzed.
本文提出了一种用于校准长波红外超广角相机的方法。此外，设计了一种新型校准棋盘，并采用先进的棋盘角点定位方法来提高校准精度。所设计的校准棋盘由热电半导体制冷装置制成，能够实现高的热红外对比度，并具有出色的稳定性。所提出的亚像素角点定位方法可根据红外图像和棋盘图案的特征准确地定位校准棋盘上的角点。阐述了所提出的红外棋盘的原理和亚像素角点定位过程，校准实验表明平均重投影误差和均方根误差分别降低到了0.32像素和0.39像素。还进行了对比研究以验证所提方法的校准效果，并分析了所提方法相机校准误差的可能性。
