||In virtue of their capability to measure temperature, thermal infrared cameras have been widely used in building diagnostics for detecting heat loss, air leakage, water damage etc. However, the lack of visual details in thermal infrared images makes the complement of visible images a necessity. Therefore, it is often useful to register images of these two modalities for further inspection of architectures. Augmented reality (AR) technology, which supplements the real world with virtual objects, offers an ideal tool for presenting the combined results of thermal infrared and visible images. In this seminar I will talk about my latest work on the problem of registering thermal infrared and visible facade images for an AR-based building diagnostics application. The method consists of quadrilateral features, which models the shapes of commonly present facade elements, such as windows; a forward selection algorithm for determining feature correspondences and a registration quality measure based on the ratio of areas between the transformed features and the reference features. Registration results will be shown both visually and quantitatively in the end.