Beta 1


Title Projection of Oblique Photos onto 3D Models of Buildings
Author Børgesen, Casper
Supervisor Bærentzen, Jakob Andreas (Image Analysis and Computer Graphics, Department of Informatics and Mathematical Modeling, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2008
Abstract Construction and texture mapping of 3D city models are usually done using either a manual or semi-automatic approach. The increasing use of 3D building geometry in different environments, demands for a fully automated approach which can lower the time it takes to create a textured 3D city model and thus lower the cost. This thesis investigates the use of projective texture mapping as a fully automated approach to texture map 3D building geometry using oblique photos. The data consists of simple 3D building geometry and oblique photos with corresponding orientation information. Due to the simplicity of the geometry and minor deviations in the accuracy of the orientations of the oblique photos, two approaches are proposed for improving the result of the texture mapping. An active shape model is used to locate the roof section of a building in an oblique photo. The geometry of the building is then translated to match the oblique photo or the projected texture is translated to match the building geometry. Another approach is to use viewdependent texture mapping to dynamically texture map the geometry by only using the oblique photos closest to the position of the observer. The results are visualised using a real-time application which allows the user to interactively explore the texture mapped buildings. Adjusting the oblique photos to the building geometry using the approach of the active shape model, gives the overall best results. When using the viewdependent texture mapping, the results show that the accuracy of the building geometry becomes less important. Conclusively, projective texture mapping is definitely a valid method for performing automated texture mapping of 3D building geometry using oblique photos - though it requires fairly accurate data.
Series IMM-M.Sc.-2008-99
Fulltext
Original PDF ep08_99_net.pdf (19.25 MB)
Admin Creation date: 2008-10-09    Update date: 2008-10-09    Source: dtu    ID: 224355    Original MXD