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Identifier uch.csd.msc//1999baltzakis
Title Εξαγωγή Χαρακτηριστικών του Τρισδιάστατου Χώρου από Δισδιάστατες Εικόνες
Alternative Title Extraction of 3D space features from 2D image data
Creator Baltzakis, Haris G
Abstract In this thesis we study the extraction of 3d world features from image data. More specifically, we consider the extraction of groups of parallel line segments by the computation of their vanishing points, and the extraction of orientations and positions of planes in the 3d-space. A basic problem in computer vision is the calculation of 3D vanishing points (VP) out of 2D perspective projections. Vanishing point analysis provides strong cues for inferring the 3D structure of a scene from only a single view. Knowledge of a VP, provided that we know the focal length of the camera, provides enough information to determine the 3D orientation of the corresponding group of space lines. In this work, we study some of the existing methods and we propose modifications exhibiting certain advantages with respect to the original methods. We also propose a novel approach for VP detection, based on the definition of vanishing point likelihood functions (VPLF). These functions estimate, for each point on the image plane, the likelihood that this point is a vanishing point and are directly applicable to the raw image data. In addition to knowledge of 3d line orientations, knowledge of the position and the orientation of planes that exist in a 3d scene is very important for many machine vision problems such as navigation, self-localization and docking. In this thesis, we study and propose methods for robustly computing the plane parameters out of given image sequences. All methods studied in this thesis also include the (limited) ability to determine unknown parameters of the 3d camera motion.
Issue date 1999-11-01
Date available 1999-11-24
Collection   School/Department--School of Sciences and Engineering--Department of Computer Science--Post-graduate theses
  Type of Work--Post-graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/2/4/8/metadata-dlib-1999baltzakis.tkl Bookmark and Share
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