Now showing items 1-20 of 141

    • A Colour Appearance Model based on Jzazbz Colour Space 

      Safdar, Muhammad; Hardeberg, Jon Yngve; Kim, Youn Jin; Luo, Ming Ronnier (Journal article; Peer reviewed, 2018)
      The current CIE colour appearance model CIECAM02 and its variant named CAM16 can well predict common colour appearance attributes including lightness, brightness, chroma, colowfulness, saturation, hue angle, and hue ...
    • A sensor-data-based denoising framework for hyperspectral images 

      Deger, Ferdinand; Mansouri, Alamin; Pedersen, Marius; Hardeberg, Jon Yngve; Voisin, Yvon (Journal article; Peer reviewed, 2015)
      Many denoising approaches extend image processing to a hyperspectral cube structure, but do not take into account a sensor model nor the format of the recording. We propose a denoising framework for hyperspectral images ...
    • A Spectral Filter Array Camera for Clinical Monitoring and Diagnosis: Proof of Concept for Skin Oxygenation Imaging 

      Bauer, Jacob Renzo; Bruins, Arnoud A.; Hardeberg, Jon Yngve; Verdaasdonk, Rudolf (Journal article; Peer reviewed, 2019)
      The emerging technology of spectral filter array (SFA) cameras has great potential forclinical applications, due to its unique capability for real time spectral imaging, at a reasonable cost.This makes such cameras ...
    • Acquisition strategies for in-situ hyperspectral imaging of stained-glass windows: case studies from the Swiss National Museum 

      Babini, Agnese; Lombardo, Tiziana; Schmidt-Ott, Katharina; George, Sony; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2023)
      Over the last decade, hyperspectral imaging has become a popular technique for the non-invasive identification and mapping of painting materials in many typologies of artworks, thanks to the possibility of obtaining spectral ...
    • Additivity Constrained Linearisation of Camera Calibration Data 

      Andersen, Casper Find; Farup, Ivar; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2023)
      When characterising a digital camera spectrally or colourimetrically, the camera response to a generally diffusely reflecting colour chart is often employed. The recorded responses to the light incident from each colour ...
    • An Adaptive Combination of Dark and Bright Channel Priors for Single Image Dehazing 

      Whannou De Dravo, Vincent Jacob; El Khoury, Jessica; Thomas, Jean-Baptiste; Mansouri, Alamin; Hardeberg, Jon Yngve (Journal article; Peer reviewed, 2017)
      Dehazing methods based on prior assumptions derived from statistical image properties fail when these properties do not hold. This is most likely to happen when the scene contains large bright areas, such as snow and sky, ...
    • An Evaluation Framework for Spectral Filter Array Cameras to Optimize Skin Diagnosis 

      Bauer, Jacob Renzo; Thomas, Jean-Baptiste; Hardeberg, Jon Yngve; Verdaasdonk, Rudolf M. (Journal article; Peer reviewed, 2019)
      Comparing and selecting an adequate spectral filter array (SFA) camera is application-specific and usually requires extensive prior measurements. An evaluation framework for SFA cameras is proposed and three cameras are ...
    • Analytical Survey of Highlight Detection in Color and Spectral Images 

      Khan, Haris Ahmad; Thomas, Jean-Baptiste; Hardeberg, Jon Yngve (Chapter, 2017)
      Detection of highlights is a prominent issue in computer vision, graphics and image processing. Applications which require object properties measurement or rendering are affected by specular reflection since the models ...
    • Appearance perception of textiles: a tactile and visual texture study 

      Mirjalili, Fereshteh; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2019)
      Texture analysis and characterization based on human perception has been continuously sought after by psychology and computer vision researchers. However, the fundamental question of how humans truly perceive texture still ...
    • Appearance-based evaluation of varnish removal methods in gilded surfaces 

      Kiyomoto Arteaga, Isabel Yoko; Marchioni, Diane; Courtier, Stéphanie; Boust, Clotilde; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2023)
      This paper outlines the use of bidirectional reflectance measurements for the characterisation and evaluation of appearance changes in gilded surfaces caused by varnishing and cleaning. Oil and water gilding mock-ups ...
    • Application of spectral statistics to surface defect detection 

      Deborah, Hilda; Richard, Noel; Hardeberg, Jon Yngve (Journal article; Peer reviewed, 2019)
      The development of a spectral difference-based statistical processing of hyperspectral images is provided in this article. Kullback-Leibler pseudo-divergence function, which was specifically developed for the metrological ...
    • Assessing the Quality of Videoconferencing: from Quality of Service to Quality of Communication 

      Shahid, Mohammed; Abebe, Mekides Assefa; Hardeberg, Jon Yngve (Journal article; Peer reviewed, 2018)
      Various approaches for the assessment of quality of experience for video conferencing exist that try to quantify the level of satisfaction of the user. In order for videoconferencing to really succeed as a substitute of ...
    • Assessment of two fast multispectral systems for imaging of a cultural heritage artifact- a Russian icon 

      Shrestha, Raju; Hardeberg, Jon Yngve (Chapter, 2019)
      As a part of the study of spectral object documentation in cultural heritage, performances of different spectral imaging systems from various institutions and research laboratories were assessed in a Round Robin Test. This ...
    • Assessment Protocols and Comparison of Ordering Relations for Spectral Image Processing 

      Deborah, Hilda; Richard, Noël; Hardeberg, Jon Yngve; Fernandez Maloigne, Christine (Journal article; Peer reviewed, 2018)
      Recent developments in hyperspectral sensors allow us to obtain high spectral and spatial resolutions that are close to the optical and physical structures of acquired surfaces. Consequently, hyperspectral imaging is used ...
    • 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 ...
    • Behavioral Investigation of Visual Appearance Assessment 

      Gigilashvili, Davit; Thomas, Jean-Baptiste; Hardeberg, Jon Yngve; Pedersen, Marius (Journal article; Peer reviewed, 2018)
      The way people judge, assess and express appearance they perceive can dramatically vary from person to person. The objective of this study is to identify the research hypotheses and outline directions for the future work ...
    • Blurring Impairs Translucency Perception 

      Gigilashvili, Davit; Pedersen, Marius; Hardeberg, Jon Yngve (Journal article; Peer reviewed, 2018)
      Translucency and factors impacting its perception is not yet fully understood. Various studies have examined the correlation between physical material properties and perceived translucency. Furthermore, the concept of ...
    • Camera Response Function Assessment in Multispectral HDR Imaging 

      Ansariasl, Majid; Thomas, Jean-Baptiste Denis; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2022)
      Recently, spatially varying Bidirectional Reflectance Distribution Functions (svBRDF) is widely used as a model to characterize the appearance of materials with varying visual properties over the surface. One of the ...
    • Caustics and Translucency Perception 

      Gigilashvili, Davit; Dubouchet, Lucas; Hardeberg, Jon Yngve; Pedersen, Marius (Peer reviewed; Journal article, 2020)
      Caustics projected onto the surface carry very interesting information regarding the material they are cast by. It has been observed in previous studies that caustics could be a widely used cue for translucency assessment ...
    • 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 ...