Applying Thermographs to Monitor the Defects Presented in Building Facades

Sheng-Min Wu, Yishuo Huang, Keng-Tsang Hsu, Ming-Gin Lee, Jia-Jun Chang


Thermography is used to record the surface temperature information. The surface temperature information is an important clue to indicate the defects presented in the building because defects can always be found in those areas whose surface temperatures are different with their surrounding neighbors. The paper proposes an approach to analyze the surface temperature information according to comparing the data similarities between the interested regions and their surrounding neighbors. In doing so, the surface temperature information of the object can be clustered into several regions such that the temperature distribution in each region is homogenous such that the temperature changes can be identified and located from the clustered regions. The paper tries to employ image segmentation to segment the collected thermographs such that the potential defect locations can be narrowed down to those regions in which the changes of surface temperature are apparent. After the potential defect locations have been identified, different NDT methods (like Visual Inspection, Impact Testing, etc.) can be used to examine those locations instead of examining the whole building facades. From the experimental results, the proposed approach based on the image segmentation does offer a reliable way to determine the potential defects shown in the building.


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