SUMMARY
Thermographic cameras record temperatures emitted by objects in the infraredregion. These thermal images can be used for texture analysis and deformationcaused by moisture and isolation problems. For accurate geometric survey of thedeformations, the geometric calibration and performance evaluation of thethermographic camera should be conducted properly. In this study, an approach isproposed for the geometric calibration of the thermal cameras for the geometricsurvey of deformation caused by moisture. A 3D test object was designed and usedfor the geometric calibration and performance evaluation. The geometric calibrationparameters, including focal length, position of principal point, and radial andtangential distortions, were determined for both the thermographic and the digitalcamera. The digital image rectification performance of the thermographic camerawas tested for photogrammetric documentation of deformation caused by moisture.The obtained results from the thermographic camera were compared with the resultsfrom digital camera based on the experimental investigation performed on a studyarea.