3-D surface reconstruction using spatial frequency based approaches under influence of perspective distortion [Elektronische Ressource] / von Sherif Said Aly El-Etriby

3-D Surface Reconstruction Using SpatialFrequency-based Approaches Under In uence ofPerspective DistortionDissertationzur Erlangung des akademischen GradesDoktoringenieur(Dr.-Ing.)von M.Sc. Sherif Said Aly El-Etriby˜geb. am 10. August 1970 in Tanta, Agyptengenehmigt durch die Fakult˜at fur˜ Elektrotechnik und Informationstechnikder Otto-von-Guericke-Universit˜at MagdeburgGutachter:Prof. Dr.-Ing. habil. Bernd MichaelisProf. Dr. rer. nat. habil. Peter HauptmannPromotionskolloquium am: 14.03.2008This work is dedicated to ...my parents, my wife (Saheir) and my children (Rawan, Rana and Ahmad)SherifiAbstractThe use of local spatial frequency provides a powerful analytical tool for image anal-ysis. This dissertation provides an improved solution to long-standing problems instereo vision; foreshortening, ambiguous matches, detecting and handling discontinu-ities and occlusion, and quantitative evaluation of stereo results.Challenges arise from the fact that stereo images are acquired from slightly dif-ferent views. Therefore, the projection of the surface in the image plane is morecompressed and occupied a smaller area in one view than the other. This efiectmakes the matching of its two images very di–cult and leads to confusing results.That is because, while corresponding two images N pixels on a scanline in one imagemay correspond to a difierent number of M pixels in the other image.