Blar i NTNU Open på forfatter "Pedersen, Marius"

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    • 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 ...

    • Can no-reference image quality metrics assess visible wavelength iris sample quality? 

      Liu, Xinwei; Pedersen, Marius; Charrier, Christophe; Bours, Patrick (Journal article; Peer reviewed, 2017)
      The overall performance of iris recognition systems is affected by the quality of acquired iris sample images. Due to the development of imaging technologies, visible wavelength iris recognition gained a lot of attention ...

    • 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 ...

    • CMYK-CIELAB Color Space Transformation Using Machine Learning Techniques 

      Velastegui Sandoval, Ronny Xavier; Pedersen, Marius (Peer reviewed; Journal article, 2021)
      In this work four different machine learning approaches have been implemented to perform the color space transformation between CMYK and CIELAB color spaces. We have explored the performance of Support-Vector Regression ...

    • Color Image Modification with and without Hue Preservation 

      Poddar, Shashi; Pedersen, Marius; Karar, Vinod (Journal article; Peer reviewed, 2018)
      Color image modification is an essential component for several applications and the grayscale transformation is generally mapped to the color image indirectly. Although several techniques have been used for this transfer, ...

    • Colour-to-greyscale image conversion by linear anisotropic diffusion of perceptual colour metrics 

      Farup, Ivar; Pedersen, Marius; Alsam, Ali (Chapter, 2018)
      We present an algorithm for conversion of colour images to greyscale. The underlying idea is that local perceptual colour differences in the colour image should translate into local differences in greylevel in the greyscale ...

    • Colourlab Image Database: Geometric Distortions 

      Pedersen, Marius; Amirshahi, Seyed Ali (Peer reviewed; Journal article, 2021)
      Over the years, a high number of different objective image quality metrics have been proposed. While some image quality metrics show a high correlation with subjective scores provided in different datasets, there still ...

    • Comparing the Chromatic Contrast Sensitivity in Vertical and Oblique Orientations 

      Amirshahi, Seyed Ali; Pedersen, Marius; Beghdadi, Azeddine (Journal article; Peer reviewed, 2019)
      While for many years achromatic contrast sensitivity has been widely studied by different research groups from various fields of work, the same attention has not been paid to chromatic contrast sensitivity. Due to the ...

    • 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 Pigment Classification Algorithms on Non-Flat Surfaces using Hyperspectral Imaging 

      Mandal, Dipendra Jee; Pedersen, Marius; George, Sony; Boust, Clotilde (Peer reviewed; Journal article, 2023)
      Cultural heritage objects, such as paintings, provide valuable insights into the history and culture of human societies. Preserving these objects is of utmost importance, and developing new technologies for their analysis ...

    • Concept-based reasoning in medical imaging 

      Vats, Anuja; Pedersen, Marius; Mohammed, Ahmed Kedir (Peer reviewed; Journal article, 2023)
      Purpose As concept-based reasoning for improving model interpretability becomes promising, the question of how to define good concepts becomes more pertinent. In domains like medical, it is not always feasible to access ...

    • Content-based image quality assessment 

      Pedersen, Marius; Cherepkova, Olga (Peer reviewed; Journal article, 2020)
      In this work we investigate the influence of image content on image quality assessment. We describe image content through a set of features, such as busyness, colorfulness, lightness, sharpness and entropy, investigating ...

    • Contributions to Spectral and 3D Imaging Technology for Cultural Heritage Applications 

      Deger, Ferdinand H. (Doctoral thesis at NTNU 2016:183, Doctoral thesis, 2016)
      The methodological approach of this doctoral thesis is to use optical imaging and to employ the mathematical theory of regularisation methods, in order to support cultural heritage research. State-of-the-art optical imaging ...

    • A Critical Analysis on Perceptual Contrast and its Use in Visual Information Analysis and Processing 

      Beghdadi, Azeddine; Qureshi, Muhammad Ali; Amirshahi, Seyed Ali; Chetouani, Aladine; Pedersen, Marius (Peer reviewed; Journal article, 2020)
      Contrast in visible images is one of the most relevant characteristics of visual signals. Since the pioneering works performed in vision psychology and optics, different definitions have been proposed in the literature. ...

    • 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 Learning for Improved Diagnosis of Pathologies in Wireless Capsule Endoscopy with Focus on Data Efficiency and Transparency 

      Vats, Anuja (Doctoral theses at NTNU;2023:272, Doctoral thesis, 2023)
      Over the past decade the use of deep learning in different application areas has increased steadily. These areas include automated decisions in industries to autonomous vehicles, defence, and even medical. Each field gives ...

    • Deep-STRESS Capsule Video Endoscopy Image Enhancement 

      Mohammed, Ahmed Kedir; Pedersen, Marius; Hovde, Øistein; Yildirim Yayilgan, Sule (Journal article; Peer reviewed, 2018)
      This paper proposes a unified framework for capsule video endoscopy image enhancement with an objective to enhance the diagnostic values of these images. The proposed method is based on a hybrid approach of deep learning ...

    • Detection of Orientation-Modulation Embedded Data in Color Printed Natural Images 

      Kitanovski, Vlado; Pedersen, Marius (Journal article; Peer reviewed, 2018)
      This article addresses methods for detection of orientation-modulation data embedded in color dispersed-dot-halftone images. Several state-of-the-art methods for detection of orientation-embedded data in printed halftone ...

    • Detection of worms in error diffusion halftoning 

      Pedersen, Marius; Albregtsen, Fritz; Hardeberg, Jon Yngve (Proceedings of SPIE;7242, Journal article; Peer reviewed, 2009)
      Digital halftoning is used to reproduce a continuous tone image with a printer. One of these halftoning algorithms, error diffusion, suffers from certain artifacts. One of these artifacts is commonly denoted as worms. We ...

    • Deteksjon av fisk i video 

      Alseth, Vebjørn Sundli; Bjørnstad, Thomas Faack (Bachelor thesis, 2020)
      Sammendrag: Norsk institutt for naturforskning ønsket å se om det var mulig å spare tid ved å benytte et verktøy som automatisk detekterer hvor i et gitt videomateriale en fisk passerer gjennom spalteåpningen på en fisketrapp. ...