Browsing by Author "Opsahl, Thomas Olsvik"

Now showing items 1-7 of 7

    • 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 ...

    • 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 multimodal multispectral sensor system for tactical reconnaissance 

      Haavardsholm, Trym Vegard; Opsahl, Thomas Olsvik; Skauli, Torbjørn; Stahl, Annette (Society of Photo-Optical Instrumentation Engineers (SPIE), 2022-09-30)
      Multispectral imaging is an attractive sensing modality for small unmanned aerial vehicles (UAVs) in numerous military and civilian applications such as reconnaissance, target detection, and precision agriculture. Cameras ...

    • 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 ...

    • 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 ...

    • 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 ...