Now showing 1 - 3 of 3
  • Publication
    Segmentation of 3D points from range camera data using scanlines
    ( 2008)
    Sabov, A.
    ;
    Krüger, J.
    This paper focuses on the segmentation of 3D points from range camera data. Range cameras can capture 3D information of a scene by sending out infrared light and then measuring the reflections. A segmentation algorithm for the detection of planar surfaces is presented which is robust against erroneous data from the range cameras. It uses a grid of horizontal and vertical scanlines as intermediate primitives for the final planar region segmentation. By using the scanlines, the task of planar segmentation can be separated into two tasks which are less complex: line segmentation and line combination. The usage of higher primitives improves the segmentation time compared to the direct operation on the 3D point data. The algorithm is described in detail and evaluated on a test scene.
  • Publication
    Registrierung von 3D-Szenen für das Facility Management
    ( 2008)
    Sabov, A.
    ;
    Krüger, J.
    In diesem Beitrag werden zwei Verfahren zur Rekonstruktion von 3D-Szenen mit Hilfe von Tiefenkameras vorgestellt. Die Verfahren lassen sich im Bereich des Facility Managements für dreidimensionale Vermessungsaufgaben einsetzen. Die Rekonstruktion wird anhand von Aufnahmen eines Büroraums demonstriert.
  • Publication
    Distance data improvement for a customary PMD range imaging sensor
    ( 2008)
    Sabov, A.
    ;
    Radmer, J.
    ;
    Krüger, J.
    Robust 3D information is crucial for various applications, such as object recognition or tracking. A recently developed sensor to acquire distance information is based on the Photo Mixer Device (PMD) technique. The current camera generation still has some drawbacks compared to other 3D sensors. One common error source for any camera is the lens. Imprecise manufacturing and positioning lead to distorted images and incorrect distance measurements. In this paper several calibration techniques are used to identify the intrinsic parameters of the camera. A camera model which considers the real path of the reflected light ray is defined. The resulting distance values still have an offset to the real distance values. A calibration setup is presented that uses two rangefinders to cal ibrate the distance values. The dependency of the offset on different parameters is evaluated and a calibration matrix is created to correct the distance values in operation.