Now showing 1 - 2 of 2
  • Publication
    Virtual reconstruction of 3D scenes based on range cameras
    ( 2009)
    Sabov, A.
    ;
    Krüger, J.
    Virtual reconstruction of existing objects and environments is needed in many different areas such as the planning of building extensions, quality assurance for production processes and city reconstructions for geographic information systems. Different scanner systems have been established which meet the demands on the application. For applications such as computer aided facility management a short scanning time is the most important factor instead of high precision. Range cameras are a new generation of 3D scanners which can measure distances to their environment directly with a high frame rate. In this paper a reconstruction method is presented which is specific to range camera data.
  • 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.