Browsing by Author "Torkildsen, Hans Erling"
Now showing items 1-8 of 8
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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 ... -
Full characterization of spatial coregistration errors and spatial resolution in spectral imagers
Torkildsen, Hans Erling; Skauli, Torbjørn (2018)For multi- and hyperspectral imagers, the integrity of the spectral information depends critically on the spatial coregistration between bands. There is at present no commonly accepted way to fully specify coregistration ... -
Measurement of point spread function for characterization of coregistration and resolution: Comparison of two commercial hyperspectral cameras
Torkildsen, Hans Erling; Skauli, Torbjørn (2018)For spectral cameras, the spatial resolution and coregistration of bands are important performance characteristics. The paper discusses how these can be quantified in a way that is relevant for the spectroscopic processing ... -
Relative wave measurement concepts for Oksøy Alta and Skjold class vessels
Løvseth, Sigurd Weidemann; Kleivstul, Asbjørn; Torkildsen, Hans Erling (2008)Sudden horizontal decelerations in rough seas due to wave diving/green water on deck may pose a serious risk to crew safety as well as to hull integrity on the new Skjold class fast patrol boats. FFI plans to develop a ... -
Resultater av fullskala verifikasjon av globale laster ved måling av kontrollert endring av stillevannsmoment
Torkildsen, Hans Erling; Sagvolden, Geir; Løvseth, Sigurd Weidemann; Jensen, Alf Egil; Wines, Christian (2008)Minesveiperen KNM Otra i Oksøy/Alta-klassen er utstyrt med et skrogovervåkningssystem. Systemet måler bl.a. globale skrogbelastninger og viser disse på skjermer på bro og i maskinkontrollrom. Hensikten med systemet er at ... -
Simplified measurement of point spread functions of hyperspectral cameras for assessment of spatial coregistration
Skauli, Torbjørn; Torkildsen, Hans Erling (2019-05-14)In multi- and hyperspectral imaging, spatial coregistration of the point spread functions (PSFs) of all bands within each pixel is critical for the integrity of measured spectra. There is a need to define a standardized ...