Now showing items 21-40 of 146

    • 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 ...
    • Characterising appearance of gold foils and gilding in conservation and restoration 

      Arteaga, Yoko; Sole, Aditya Suneel; Hardeberg, Jon Yngve; Boust, Clotilde (Peer reviewed; Journal article, 2022)
      Materials with complex optical properties like gold foils are commonly used for gilding in the field of conservation and restoration to render the visual appearance of the restoration object. Characterising the appearance ...
    • Characterizing the response of charge-couple device digital color cameras 

      Slavkovikj, Viktor; Hardeberg, Jon Yngve; Eichhorn, Alexander (Journal article; Peer reviewed, 2012)
      The advance and rapid development of electronic imaging technology has lead the way to production of imaging sensors capable of acquiring good quality digital images with a high resolution. At the same time the cost and ...
    • Color and Quality Enhancement of Videoconferencing Whiteboards 

      Duque, Carlos Andrés Arango; Abebe, Mekides Assefa; Shahid, Mohammed; Hardeberg, Jon Yngve (Journal article; Peer reviewed, 2018)
      Whiteboards are commonly used as a medium of instant illustration of ideas during several activities including presentations, lectures, meetings, and related others through videoconferencing systems. However, the acquisition ...
    • Color names affect the precision of memorized hues. The effect of increased color name distinctiveness 

      Skora, Zuzanna; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2022)
      Color names influence the memory of a specific hue by shifting it closer to the prototypical color associated with the name. Typically, in studies regarding color naming and memory maximally seven traditional color names ...
    • Colour and spectral simulation of textile samples onto paper: a feasibility study 

      Slavuj, Radovan; Marijanovic, Kristina; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2014)
      This study has investigated how the growing technology of multichannel printing and the area of spectral printing in the graphic arts could help the textile industry to communicate accurate colour. In order to reduce 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 eye tracking devices used on printed images 

      Komínková, Barbora; Pedersen, Marius; Hardeberg, Jon Yngve; Kaplanová, Marie (Proceedings of SPIE;6806, Journal article; Peer reviewed, 2008)
      Eye tracking as a quantitative method for collecting eye movement data, requires the accurate knowledge of the eye position, where eye movements can provide indirect evidence about what the subject sees. In this study two ...
    • Comparison of Hyperspectral Imaging and Fiber-Optic Reflectance Spectroscopy for Reflectance and Transmittance Measurements of Colored Glass 

      Babini, Agnese; Green, Philip John; George, Sony; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2022)
      The work presented in this paper is part of a wider research project, which aims at documenting and analyzing stained glass windows by means of hyperspectral imaging. This technique shares some similarities with UV-VIS-IR ...
    • 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 ...
    • Compensating for non-uniform screens in projection display systems 

      Renani, Siavash Asgari; Tsukada, Masato; Hardeberg, Jon Yngve (Proceedings of SPIE;7241, Journal article; Peer reviewed, 2009)
      In this paper the performance of screen compensation based on previous work by Nayar et al. and Ashdown et al. and five different camera characterization methods are evaluated. Traditionally, colorimetric characterization ...
    • Computational Color Constancy using a Stereo Camera 

      Shrestha, Raju; Hardeberg, Jon Yngve (Chapter; Peer reviewed, 2012)
      Chromagenic color constancy is one of the promising solutions to the color constancy problem. However, this technique requires two shots of a scene: a conventional RGB image and an additional image that is optically ...
    • Computational color constancy using chromagenic filters in color filter arrays 

      Shrestha, Raju; Hardeberg, Jon Yngve (Journal article; Peer reviewed, 2012)
      We have proposed, in this paper, a new color constancy technique, an extension to the chromagenic color constancy. Chromagenic based illuminant estimation methods take two shots of a scene, one without and one with a ...
    • Computational techniques for virtual reconstruction of fragmented archaeological textiles 

      Gigilashvili, Davit; Lukesova, Hana; Gulbrandsen, Casper Fabian; Harijan, Akash; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2023)
      Archaeological artifacts play important role in understanding the past developments of the humanity. However, the artifacts are often highly fragmented and degraded, with many details and parts missing due to centuries’ ...
    • Craquelure as a Graph: Application of Image Processing and Graph Neural Networks to the Description of Fracture Patterns 

      Sidorov, Oleksii; Hardeberg, Jon Yngve (Chapter, 2019)
      Cracks on a painting is not a defect but an inimitablesignature of an artwork which can be used for origin exam-ination, aging monitoring, damage identification, and evenforgery detection. This work presents the development ...
    • Creating a simulation option for the reconstruction of ancient documents: Palimpsests 

      Reiner, Eschbach; Roger, Easton; Knox, Keith; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2019)
      Ancient documents were often created by overwriting older documents that had been erased to re-use the expensive parchment. There is thus the situation that we have valuable documents that actually contain possibly more ...
    • Data Hiding by White Modulation in Color Direct Binary Search Halftones 

      Kitanovski, Vlado; Eschbach, Reiner; Pedersen, Marius; Hardeberg, Jon Yngve (Journal article; Peer reviewed, 2017)
      In this article, the authors propose a method for hiding a visual watermark in color printed images with arbitrary, natural content. The embedded watermark is imperceptible under normal illumination, but it is revealed ...
    • Deep Hyperspectral Prior: Single-Image Denoising, Inpainting, Super-Resolution 

      Sidorov, Oleksii; Hardeberg, Jon Yngve (Chapter, 2019)
      Deep learning algorithms have demonstrated state-of-the-art performance in various tasks of image restoration. This was made possible through the ability of CNNs to learn from large exemplar sets. However, the latter becomes ...
    • Deep Learning Approaches for Whiteboard Image Quality Enhancement 

      Abebe, Mekides Assefa; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2019)
      Different whiteboard image degradations highly reduce the legibility of pen-stroke content as well as the overall quality of the images. Consequently, different researchers addressed the problem through different image ...
    • Densely Residual Network with Dual Attention for Hyperspectral Reconstruction from RGB Images 

      Wang, Lixia; Sole, Aditya Suneel; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2022)
      In the last several years, deep learning has been introduced to recover a hyperspectral image (HSI) from a single RGB image and demonstrated good performance. In particular, attention mechanisms have further strengthened ...