Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

Filters
2
Reset filters

Settings
Now showing 1 - 2 of 2
  • Publication
    Data evaluation for depth calibration of a customary PDM range imaging sensor considering objects with different albedo
    ( 2008)
    Radmer, J.
    ;
    Sabov, A.
    ;
    Krüger, J.
    For various applications, such as object recognition or tracking and especially when the object is partly occluded or articulated, 3D information is crucial for the robustness of the application. A recently developed sensor to aquire distance information is based on the photo mixer device (PMD) technique. This article presents an easy but accurate data acquisition method for data evaluation of a customary sensor. Data evaluation focuses on the detection of the over- and underexposured data under consideration of objects with two different albedos. This improves the exactitude of the data for the study of the systematic errors of this sensor. Therefore the work of this article can be seen as an intermediate result on the way to a PMD range imaging sensor calibration. Entnommen aus TEMA
  • 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.