Research on calibration method of infrared camera based on thermal radiation enhancement

Abstract

Infrared camera is a photoelectric device that obtains temperature by detecting thermal radiation. With the need of multisensor fusion application, the accurate acquisition of camera parameters has become an important topic. Based on Zhang Zhengyou's calibration method, infrared thermal radiation is used to enhance the reflectivity of the calibration plate. The asymmetric circle is used as the calibration pattern and the circle center is used as the calibration feature. The preprocessing method of calibration image is designed by contrast experiment. The preparation of calibration image is completed through two steps of image contrast enhancement and image binarization under uneven illumination. The error rate of infrared camera calibration reaches 0.04%. This method avoids complex active infrared calibration plate making, improves the problem of difficult extraction of corner features in infrared images, and solves the infrared calibration problem with simple and easy to obtain tools, and obtains sufficient accuracy