Now showing items 1-13 of 13

    • Anisotropic scattered data interpolation for pushbroom image rectification 

      Ringaby, Erik; Friman, Ola; Forssén, Per-Erik; Opsahl, Thomas Olsvik; Haavardsholm, Trym Vegard; Kåsen, Ingebjørg (2014)
      This paper deals with fast and accurate visualization of pushbroom image data from airborne and spaceborne platforms. A pushbroom sensor acquires images in a line-scanning fashion, and this results in scattered input data ...
    • An ATR architecture for algorithm development and testing 

      Breivik, Gøril Margrethe; Løkken, Kristin Hammarstrøm; Brattli, Alvin Andreas; Palm, Hans Christian; Haavardsholm, Trym Vegard (2013)
      A research platform with four cameras in the infrared and visible spectral domains is under development at the Norwegian Defence Research Establishment (FFI). The platform will be mounted on a high-speed jet aircraft and ...
    • Characterization of a compact 6-band multifunctional camera based on patterned spectral filters in the focal plane 

      Torkildsen, Hans Erling; Hovland, Harald; Opsahl, Thomas Olsvik; Haavardsholm, Trym Vegard; Nicolas, Stephane; Skauli, Torbjørn (2014)
      In some applications of multi- or hyperspectral imaging, it is important to have a compact sensor. The most compact spectral imaging sensors are based on spectral filtering in the focal plane. For hyperspectral imaging, ...
    • Compact camera for multispectral and conventional imaging based on patterned filters 

      Skauli, Torbjørn; Torkildsen, Hans Erling; Nicolas, Stephane; Opsahl, Thomas Olsvik; Haavardsholm, Trym Vegard; Kåsen, Ingebjørg; Rognmo, Atle (2014)
      A multispectral camera concept is presented. The concept is based on using a patterned filter in the focal plane, combined with scanning of the field of view. The filter layout has stripes of different bandpass filters ...
    • Compact multispectral multi-camera imaging system for small UAVs 

      Torkildsen, Hans Erling; Haavardsholm, Trym Vegard; Opsahl, Thomas Olsvik; Datta, Urmila; Skaugen, Atle; Skauli, Torbjørn (2016)
      Cameras with filters in the focal plane provide the most compact solution for multispectral imaging. A small UAV can carry multiple such cameras, providing large area coverage rate at high spatial resolution. We investigate ...
    • Detection of military objects in LADAR images 

      Palm, Hans Christian; Ajer, Halvor; Haavardsholm, Trym Vegard (2008)
      This report describes different techniques for preprocessing, segmentation, and detection of vehicle sized objects in LADAR images. Five preprocessing strategies are presented; 1) Median filtering, 2) Two 1-D median ...
    • Estimating the pixel footprint distribution for image fusion by ray tracing lines of sight in a Monte Carlo scheme 

      Opsahl, Thomas Olsvik; Haavardsholm, Trym Vegard (2013)
      Images from airborne cameras can be a valuable resource for data fusion, but this typically requires them to be georeferenced. This usually implies that the information of every pixel should be accompanied by a single ...
    • Extraction and classification of vehicles in LADAR imagery 

      Palm, Hans Christian; Haavardsholm, Trym Vegard; Ajer, Halvor; Jensen, Cathrine V. (2013)
      The work presented in this paper is based on a dataset recorded with an airborne sensor. It comprises targets like M-60, M-47, M-113, bridge layers, tank retrievers, and trucks in various types of scenes. The background-object ...
    • In-operation calibration of clock-bias and intrinsic parameters for pan-tilt-zoom cameras based on keypoint tracking 

      Larsen, Martin Vonheim; Haavardsholm, Trym Vegard; Mathiassen, Kim (2020-09-20)
      We propose a method for jointly estimating intrinsic calibration and internal clock synchronisation for a pantilt- zoom (PTZ) camera using only data that can be acquired in the field during normal operation. Results show ...
    • Multimodal Multispectral Imaging System for Small UAVs 

      Haavardsholm, Trym Vegard; Skauli, Torbjørn; Stahl, Annette (2020-01-17)
      Multispectral imaging is an attractive sensing modality for small unmanned aerial vehicles (UAVs) in numerous applications. The most compact spectral camera architecture is based on spectral filters in the focal plane. ...
    • Real-time anomaly detection in hyperspectral images using multivariate normal mixture models and GPU processing 

      Tarabalka, Yulija; Haavardsholm, Trym Vegard; Kåsen, Ingebjørg; Skauli, Torbjørn (2009)
      Hyperspectral imaging, which records a detailed spectrum of light arriving in each pixel, has many potential uses in remote sensing as well as other application areas. Practical applications will typically require real-time ...
    • Real-time georeferencing for an airborne hyperspectral imaging system 

      Opsahl, Thomas Olsvik; Haavardsholm, Trym Vegard; Winjum, Ingebrigt (2011)
      The paper describes the georeferencing part of an airborne hyperspectral imaging system based on pushbroom scanning. Using ray-tracing methods from computer graphics and a highly efficient representation of the digital ...
    • A simple Ladar simulator based on ray tracing 

      Haavardsholm, Trym Vegard (2009)
      In the study of ladar image processing, it is useful to have a method for producing synthetic data. This report presents a simple ladar simulator implemented in Matlab, which produces synthetic ladar images by simulating ...