Blar i forfatter "Skjelvareid, Martin Hansen"

Viser treff 1-6 av 6

    • Mapping Marine Macroalgae along the Norwegian Coast Using Hyperspectral UAV Imaging and Convolutional Nets for Semantic Segmentation 

      Skjelvareid, Martin Hansen; Rinde, Eli; Hancke, Kasper; Blix, Katalin; Hoarau, Galice Guillaume (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-10-20)
      Marine macroalgae form underwater "blue forests" with several important functions. Hyperspectral imaging from unmanned aerial vehicles provides a rich set of spectral and spatial data that can be used to map the distribution of such macroalgae. Results from a study using 81 annotated hyper-spectral images from the Norwegian coast are presented. A U-net convolutional network was used for classification, ...

    • Predicting liquid loss of frozen and thawed cod from hyperspectral imaging 

      Anderssen, Kathryn Elizabeth; Stormo, Svein Kristian; Skåra, Torstein; Skjelvareid, Martin Hansen; Heia, Karsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-20)
      As the ability to appraise the quality of every fish in a delivery in a consistent, objective, and rapid manner has numerous advantages for both sellers and buyers, there has been much research into methods to achieve this. One possible proxy for quality assessment is liquid loss, which correlates with undesirable sensory attributes. This study evaluated whether hyperspectral imaging could predict ...

    • Synthetic aperture ultrasound imaging with application to interior pipe inspection 

      Skjelvareid, Martin Hansen (Doctoral thesis; Doktorgradsavhandling, 2012-09-07)
      This thesis is concerned with synthetic aperture focusing of ultrasonic pulse-echo measurements, with application to multilayered media and cylindrical structures. The work is motivated by the need for accurate methods for non-destructive testing of pipelines, particularly water distribution pipelines. By improving the lateral resolution in ultrasonic measurements, the synthetic aperture algorithms ...

    • Three-dimensional ultrasonic imaging in multilayered media 

      Skjelvareid, Martin Hansen; Olofsson, Tomas; Birkelund, Yngve (Conference object; Konferansebidrag, 2011)
      The synthetic aperture focusing technique is a method for focusing ultrasonic scans used in nondestructive testing. Traditionally, the technique has mainly been used for contact testing, where the speed of sound is constant throughout the whole medium, but a number of recently proposed algorithms have extended the technique to multilayered media. One important application for such multilayer methods ...

    • Ultrasonic imaging of pitting using multilayer synthetic aperture focusing 

      Skjelvareid, Martin Hansen; Olofsson, Tomas; Birkelund, Yngve (Journal article; Tidsskriftartikkel; Peer reviewed, 2011)
      Synthetic aperture focusing is known to increase both the lateral resolution and signal-to-noise level of pulse-echo ultrasonic images. In this paper, the use of synthetic aperture imaging for detection and sizing of pitting in a plate is considered. It is assumed that a water layer is present between the transducer and the plate, and that the pitting is on the back side of the plate, seen from the ...

    • Verktøy for å måle fiskekvalitet - basert på forbrukernes oppfatning (Fase 1 – Forprosjekt). Sluttrapport 

      Nilsen, Heidi; Esaiassen, Margrethe; Østli, Jens; Nøstvold, Bjørg Helen; Pleym, Ingelinn Eskildsen; Reynisson, Eyjólfur; Skjelvareid, Martin Hansen; Heia, Karsten (Research report; Forskningsrapport, 2014-10-16)
      Ved å ha et enkelt verktøy til bruk ved vurdering av kvalitet på fisk i disk kan man sikre at fisk som tilbys forbrukerne har god kvalitet. Det er imidlertid vanskelig å måle fiskekvalitet. Samtidig er det behov for et verktøy for å evaluere kvaliteten på fisken som omsettes. Butikkansatte har behov for å vurdere om fisken holder god nok kvalitet ved mottak og når den skal legges i disken. Mattilsynet ...