• Halftone Modulation for Embedding UV Watermarks in Color Printed Images 

      Kitanovski, Vlado; Pedersen, Marius (Conference object; Peer reviewed, 2019)
      A method for embedding ultraviolet (UV) responsive watermarks in CMY printed halftone images, named white modulation (WM), was proposed recently, which is based on the iterative color direct binary search (CDBS) halftoning ...
    • Halftone modulations for data hiding in color printed images 

      Kitanovski, Vlado (Doctoral theses at NTNU;2019:8, Doctoral thesis, 2019)
      Techniques for embedding imperceptible data in printed images have been studied for the past few decades. The hidden data in printed images can be used to bridge the gap between printed media and the digital world in ...
    • High-Level Visual Masking of Image Compression Artefacts 

      Le Moan, Steven; Pedersen, Marius; Chetouani, Aladine (Chapter, 2020)
      We present the results of a subjective experiment where we measured detection thresholds for 2°wide noise targets placed in 23 different natural scenes. Unlike previous studies on visual masking, we focus particularly on ...
    • How different iterative and filtered back projection kernels affect CT numbers and low contrast detectability 

      Volgyes, David; Pedersen, Marius; Stray-Pedersen, Arne; Waaler, Dag; Martinsen, Anne Catrine Trægde (Journal article; Peer reviewed, 2016)
      Objective: The aim of this study was to evaluate how different iterative and filtered back projection kernels affect the computed tomography (CT) numbers and low contrast detectability. Methods: Five different scans ...
    • How re-training process affect the performance of no-reference image quality metric for face images 

      Liu, Xinwei; Charrier, Christophe; Pedersen, Marius; Bours, Patrick (Journal article; Peer reviewed, 2019)
      The accuracy of face recognition systems is significantly affected by the quality of face sample images. There are many existing no-reference image quality metrics (IQMs) that are able to assess natural image quality by ...
    • Image De-Quantization Using Plate Bending Model 

      Völgyes, David; Martinsen, Anne Catrine Trægde; Stray-Pedersen, Arne; Waaler, Dag; Pedersen, Marius (Journal article; Peer reviewed, 2018)
      Discretized image signals might have a lower dynamic range than the display. Because of this, false contours might appear when the image has the same pixel value for a larger region and the distance between pixel levels ...
    • Image Quality Assessment by Comparing CNN Features between Images 

      Amirshahi, Seyed Ali; Pedersen, Marius; Yu, Stella X. (Peer reviewed; Journal article, 2016)
      Finding an objective image quality metric that matches the subjective quality has always been a challenging task. We propose a new full reference image quality metric based on features extracted from Convolutional Neural ...
    • Image Quality Assessment without Reference by Combining Deep Learning-Based Features and Viewing Distance 

      Chetouani, Aladine; Pedersen, Marius (Peer reviewed; Journal article, 2021)
      An abundance of objective image quality metrics have been introduced in the literature. One important essential aspect that perceived image quality is dependent on is the viewing distance from the observer to the image. ...
    • Image Quality Evaluation in Clinical Research: A Case Study on Brain and Cardiac MRI Images in Multi-Center Clinical Trials 

      Osadebey, Michael; Pedersen, Marius; Arnold, Douglas; Wendel-Mitoraj, Katrina (Journal article; Peer reviewed, 2018)
      Magnetic resonance imaging (MRI) system images are important components in the development of drugs because it can reveal the underlying pathology in diseases. Unfortunately, the processes of image acquisition, storage, ...
    • Image quality in forensic CT imaging 

      Völgyes, David (Doctoral theses at NTNU;2018:294, Doctoral thesis, 2018)
      What factors affect the diagnostic image quality in forensic computed tomography (CT) imaging? In this thesis I briefly present the main steps from CT scanning to diagnostics. The thesis is built on four core papers. The ...
    • Image Quality Metrics for the Evaluation and Optimization of Capsule Video Endoscopy Enhancement Techniques 

      Pedersen, Marius; Cherepkova, Olga; Mohammed, Ahmed Kedir (Journal article; Peer reviewed, 2017)
      Capsule endoscopy, using a wireless camera to capture the digestive track, is becoming a popular alternative to traditional colonoscopy. The images obtained from a capsule have lower quality compared to traditional ...
    • Image quality metrics for the evaluation of print quality 

      Pedersen, Marius; Bonnier, Nicolas; Hardeberg, Jon Yngve; Albregtsen, Fritz (Proceedings of SPIE;7867, Journal article; Peer reviewed, 2011)
      Image quality metrics have become more and more popular in the image processing community. However, so far, no one has been able to define an image quality metric well correlated with the percept for overall image quality. ...
    • Image Statistics as Glossiness and Translucency Predictor in Photographs of Real-world Objects 

      Gigilashvili, Davit; Tanaka, Midori; Pedersen, Marius; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2020)
      We interpret our surrounding based on the visual stimuli, and perceive objects and materials around us to have various attributes, like color, glossiness, and translucency. We analyze the three-dimensional world based on ...
    • Image texture and radiation dose properties in CT 

      Możejko, Dawid; Andersen, Hilde Kjernlie; Pedersen, Marius; Waaler, Dag; Martinsen, Anne Catrine Trægde (Journal article; Peer reviewed, 2016)
      The aim of this study was to compare image noise properties of GE Discovery HD 750 and Toshiba Aquilion ONE. The uniformity section of a Catphan 600 image quality assurance phantom was scanned with both scanners, at different ...
    • Image-Based Recognition of Individual Trouts in the Wild 

      Zhao, Lingcong; Pedersen, Marius; Hardeberg, Jon Yngve; Dervo, Børre Kind (Journal article; Peer reviewed, 2019)
      Individual fish recognition has potentials in applications as fish cultivcation and fishing tourism. Unlike previous research, which either based on physical marker or based on photograph comparison using observers, this ...
    • Impact of printing surfaces with UV-curable inks on sound absorption 

      Kitanovski, Vlado; Nersveen, Jonny; Strand, Anton; Pedersen, Marius (Peer reviewed; Journal article, 2020)
      The recent UV-curable inks, used in modern inkjet printing systems, bring several advantages and therefore a potential to expand to new applications, including décor printing. In this work, we investigate the impact of ...
    • Impact of Shape on Apparent Translucency Differences 

      Gigilashvili, Davit; Urban, Philipp; Thomas, Jean-Baptiste; Hardeberg, Jon Yngve; Pedersen, Marius (Journal article; Peer reviewed, 2019)
      Translucency is one of the major appearance attributes. Apparent translucency is impacted by various factors including object shape and geometry. Despite general proposals that object shape and geometry have a significant ...
    • Importance of region-of-interest on image difference metrics 

      Pedersen, Marius (Master thesis, 2007)
      NORSK: Mange bildeforskjellsmetrikker har sett dagens lys de siste tiår. Alle disse metrikkene har som mål å prediktere oppfattet bildeforskjell, men ingen har vært suksessfulle. Når mennesker klassiferer bildeforskjeller ...
    • Learning-based segmentation of optic disc in retinal images using clustering trees and local mode filtering 

      Osadebey, Michael; Pedersen, Marius; Waaler, Dag (Chapter, 2020)
      Delineation of the optic disc boundary in retinal images is the first step towards the computation of cup-to-disc ratio, an important indicator of ophthalmic pathologies such as glaucoma. This paper proposes the combination ...
    • Local Indicators of Spatial Autocorrelation (LISA): Application to Blind Noise-Based Perceptual Quality Metric Index for Magnetic Resonance Images 

      Osadebey, Michael; Pedersen, Marius; Arnold, Douglas; Wendel-Mitoraj, Katrina (Journal article; Peer reviewed, 2019)
      Noise-based quality evaluation of MRI images is highly desired in noise-dominant environments. Current noise-based MRI quality evaluation methods have drawbacks which limit their effective performance. Traditional ...