• An automatic image-based system for detecting wild and stocked fish 

      Myrum, Espen; Nørstebø, Simen Andre; George, Sony; Pedersen, Marius; Museth, Jon (Journal article; Peer reviewed, 2019)
      Fish stocking is the method of raising fish in a hatchery and releasing them into a river or lake to sustain or increase an existing population or to create a population. This has been practised in many countries, including ...
    • Automated Salamander Recognition Using Deep Neural Networks and Feature Extraction 

      Bakløkken, Jørgen; Schoeler, Felix; Nørholm, Hugo (Bachelor thesis, 2019)
      Hensikten med dette prosjektet er å utvikle et automatisert verktøy og metode som kan identifisere salamandere ved å bruke deres individspesifikke bukmønstre. Vi har undersøkt en rekke med forskjellige eksisterende metoder ...
    • Automated salamander recognition using deep neural networks and feature extraction 

      Bakløkken, Jørgen; Schoeler, Felix; Nørholm, Hugo; George, Sony; Pedersen, Marius; Dervo, Børre Kind (Journal article; Peer reviewed, 2019)
      This paper presents a study conducted to recognize salamanders by using their unique body markings based on images. The detection and matching of unique patterns in a salamander’s body can be complex due variability in ...
    • Automatic Redeye Correction Algorithm with Multilevel Eye Confirmation 

      George, Sony; Hardeberg, Jon Yngve; George, Tomson G.; Nampoori, V. P. N. (Journal article; Peer reviewed, 2010)
      Redeye is a well-known problem in portrait photography. This effect is caused by the light entering the subject's eye through the pupil and reflection from the retina back to the imaging sensor. Many of the existing redeye ...
    • Automatisk gjenkjenning av settefisk 

      Nørstebø, Simen Andre; Myrum, Espen (Bachelor thesis, 2019)
      Norsk institutt for naturforskning ønsket å se om det var mulig å automatisk gjenkjenne om en undervannsvideo viser en settefisk eller villfisk. I denne rapporten skal vi se nærmere på ulike metoder for å løse dette problemet ...
    • Changes in the visual appearance of polychrome wood caused by (accelerated) aging 

      Sidorov, Oleksii; Hardeberg, Jon Yngve; George, Sony; Harvey, Joshua; Smithson, Hannah (Peer reviewed; Journal article, 2020)
      This work takes a step towards understanding fundamental aspects of appearance change in cultural heritage. Particularly, we concentrate on the case study of the Hedal Madonna – a polychrome wood sculpture dated to the ...
    • Colour-Balanced Edge-Guided Digital Inpainting: Applications on Artworks 

      Ciortan, Irina-Mihaela; George, Sony; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2021)
      The virtual inpainting of artworks provides a nondestructive mode of hypothesis visualization, and it is especially attractive when physical restoration raises too many methodological and ethical concerns. At the same time, ...
    • Comparison of Imaging Models for Spectral Unmixing in Oil Painting 

      Grillini, Federico; Thomas, Jean Baptiste; George, Sony (Peer reviewed; Journal article, 2021)
      The radiation captured in spectral imaging depends on both the complex light–matter interaction and the integration of the radiant light by the imaging system. In order to obtain material-specific information, it is important ...
    • Comparison of Ink Classification Capabilities of Classic Hyperspectral Similarity Features 

      Melit Devassy, Binu; George, Sony; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2019)
      Ink classification is an active topic in historic and forensic document analysis. In this work, we compared the ink classification capabilities of five commonly used and wellproven similarity measures for classification ...
    • Contactless Classification of Strawberry Using Hyperspectral Imaging 

      Melit Devassy, Binu; George, Sony (Peer reviewed; Journal article, 2020)
      Rapid non-contact estimation of fruit quality parameters is an essential factor for an efficient food processing pipeline. We propose a novel workflow for the contactless classification of strawberries based on their sugar ...
    • Dimensionality reduction and visualisation of hyperspectral ink data using t-SNE 

      Melit Devassy, Binu; George, Sony (Peer reviewed; Journal article, 2020)
      Ink analysis is an important tool in forensic science and document analysis. Hyperspectral imaging (HSI) captures large number of narrowband images across the electromagnetic spectrum. HSI is one of the non-invasive tools ...
    • Forensic analysis of beverage stains using hyperspectral imaging 

      Melit Devassy, Binu; George, Sony (Peer reviewed; Journal article, 2021)
      Documentation and analysis of crime scene evidences are of great importance in any forensic investigation. In this paper, we present the potential of hyperspectral imaging (HSI) to detect and analyze the beverage stains ...
    • Hyperspectral imaging of art: Acquisition and calibration workflows 

      Pillay, Ruven Lucio Saravana; Hardeberg, Jon Yngve; George, Sony (Peer reviewed; Journal article, 2019)
      Hyperspectral imaging has become an increasingly used tool in the analysis of works of art. However, the quality of the acquired data and the processing of that data to produce accurate and reproducible spectral image cubes ...
    • Mobil app for film reading device 

      Heggholmen, Håkon; Hådem, Christian; Stende, Even Måren (Bachelor thesis, 2018)
      Piql AS har utviklet en langtidslagringsteknologi ved å lagre data binært på 35mm fotosensitiv film. For å vise frem produktets robusthet og enkelhet, ønsker Piql å se på muligheter for å lese inn data ved bruk av en ...
    • Multispectral and Hyperspectral Imaging of Art: Quality, Calibration and Visualization 

      Pillay, Ruven (Doctoral theses at NTNU;2021:111, Doctoral thesis, 2021)
      Multispectral and hyperspectral imaging can be powerful tools for analyzing and documenting works of art due to their ability to simultaneously capture both accurate spectral and spatial information. The data can be used ...
    • Quality evaluation in spectral imaging – Quality factors and metrics 

      Shrestha, Raju; Pillay, Ruven; George, Sony; Hardeberg, Jon Yngve (Journal article, 2014)
      Spectral imaging has many advantages over conventional three channel colour imaging, and has numerous applications in many domains. Despite many benefits, applications, and different techniques being proposed, little ...
    • Reflectance-based surface saliency 

      Pitard, Gilles; Le Goïc, Gaëtan; Mansouri, Alamin; Favreliére, Hugues; Pillet, Maurice; George, Sony; Hardeberg, Jon Yngve (Journal article; Peer reviewed, 2018)
      In this paper, we propose an original methodology allowing the computation of the saliency maps for high dimensional RTI data (Reflectance Transformation Imaging). Unlike most of the classical methods, our approach aims ...
    • RGB-NIR image enhancement by fusing bilateral and weighted least squares filters 

      Sharma, Vivek; Hardeberg, Jon Yngve; George, Sony (Journal article; Peer reviewed, 2017)
      Image enhancement using visible (RGB) and near-infrared (NIR) image data has been shown to enhance useful details of the image. While the enhanced images are commonly evaluated by observers’ perception, in the present work, ...
    • Robust Anomaly Detection Using Reflectance Transformation Imaging for Surface Quality Inspection 

      Pitard, Gilles; Le Goïc, Gaëtan; Mansouri, Alamin; Favreliére, Hugues; Pillet, Maurice; George, Sony; Hardeberg, Jon Yngve (Chapter, 2017)
      We propose a novel methodology for the detection and analysis of visual anomalies on challenging surfaces (metallic). The method is based on a local assessment of the reflectance across the inspected surface, using Reflectance ...
    • Spectral-divergence based pigment discrimination and mapping: A case study on The Scream (1893) by Edvard Munch 

      Deborah, Hilda; George, Sony; Hardeberg, Jon Yngve (Journal article; Peer reviewed, 2019)
      An important application of imaging spectroscopy or hyperspectral imaging is the classification or discrimination of pigments based on the obtained spectral reflectance information. As opposed to being a point-analysis ...