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检索条件"机构=Colour and Visual Computing Laboratory"

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Skin color simulation - Review and analysis of available Monte Carlo-based photon transport simulation models 25

Skin color simulation - Review and analysis of available Mon...

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25th Color and Imaging Conference: Color Science and Engineering Systems, Technologies, and Applications, CIC 2017

作者： Bauer, Jacob R. Pedersen, Marius Hardeberg, Jon Y. Verdaasdonk, Rudolf NTNU Department of Computer Science Norwegian Colour and Visual Computing Laboratory Gjøvik Norway VU University Medical Center Dept. of Physics and Medical Technology Amsterdam Netherlands

ISBN: (纸本)9780892083282

Optical assessment is a useful tool for non-invasive skin assessment avoiding scarring, time delayed diagnosis, hurting, and inconvenience for patient and practitioner. This has led to wide adaption of digital imaging and other optical technologies in dermatology. Many of these optical technologies lack quantifiability, therefore, the reproduction, comparison or absolute meaning of measurements or images is an open challenge. Monte Carlo simulation for multi-layered turbid media provides an accurate tool for simulating the optical path of photons traversing in the skin and the diffuse spectral reflectance of skin. With this tool at hand the missing link between health metrics and measurable optical phenomena can be provided and it can help to establish optical assessment and digital images as a standard for health monitoring of skin. A number of publicly available simulation codes and several different approaches have been proposed. In this work we give an overview of three Monte Carlo simulation tools and compare the different approaches. Furthermore, we will use Monte Carlo Simulations to generate different spectra based on varying optical properties and use these spectra to generate colour patches to analyse the impact of different optical properties on the resulting RGB colour patches.

关键词： Monte Carlo methods

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On large local error accumulation in multilevel error diffusion 22

On large local error accumulation in multilevel error diffus...

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Color Imaging XXII: Displaying, Processing, Hardcopy, and Applications 2017

作者： Eschbach, Reiner Pedersen, Marius Norwegian Colour and Visual Computing Laboratory Faculty of Computer Science and Media Technology NTNU-Norwegian University of Science and Technology Gjøvik Norway Monroe Community College RochesterNY United States

Error diffusion is an often used method that transforms a continuous tone (multibit) image into an image of lower bit depth, most commonly into a binary output of black and white. The simplicity of the processing and the quality of the output have made error diffusion a frequently used tool. Part of the image quality is attributed to the minimization of quantization errors in the error-diffusion process. This article describes local instabilities in a color multilevel error-diffusion system that-in contrast-can lead to large local errors in the output, far exceeding the normally expected quantization errors. This can have serious negative effects specifically in connection with the design and incorporation of color calibration sheets. © 2017, Society for Imaging Science and Technology.

关键词： Color

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Spectral divergence for cultural heritage applications 25

Spectral divergence for cultural heritage applications

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25th Color and Imaging Conference: Color Science and Engineering Systems, Technologies, and Applications, CIC 2017

作者： Plutino, A. Richard, N. Deborah, H. Fernandez-Maloigne, C. Ludwig, N.G. XLIM Laboratory JRU CNRS 7252 Poitiers University Futuroscope France Norwegian Colour and Visual Computing Laboratory Dpt of Computer Science NUS and T Gjøvik Norway Dept. of Physic State University of Milano Italy

ISBN: (纸本)9780892083282

Using reflectance spectra allows to compare the pigment mixtures in paintings. In order to improve the actual subjective spectral comparison, we propose to use spectral similarity measures. The Kullback-Leibler spectral Pseudo-Divergence (KLPD) is selected due to his expected metrological properties. The comparison between a subjective assessment and the objective assessment is developed for mixture of pigments coming from a cultural heritage painting. The obtained results show the good quality of the relationship between the subjective results and the objective ones using the KLPD.

关键词： Mixtures

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Stereoscopic image quality assessment based on the binocular properties of the human visual system

Stereoscopic image quality assessment based on the binocular...

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Yu Fan Mohamed-Chaker Larabi Faouzi Alaya Cheikh Christine Fernandez-Maloigne XLIM University of Poitiers France Norwegian Colour and Visual Computing Laboratory NTNU-Gjovik Norway

ISBN: (纸本)9781509041183

One of the most challenging issues in stereoscopic image quality assessment (IQA) is how to effectively model the binocular behaviors of the human visual system (HVS). The latter has a great impact on the perceptual stereoscopic 3D (S3D) quality. This paper presents a stereoscopic IQA metric based on the properties of the HVS. Instead of measuring the quality of the left and the right views separately, the proposed method predicts the quality of a cyclopean image to ensure that the overall S3D quality is as close as possible to the binocular vision. The cyclopean image is synthesized based on the local entropy of each view with the aim to simulate the phenomena of the binocular rivalry/suppression. A 2D IQA metric is employed to assess the quality of both the cyclopean image and the disparity map. Additionally, the quality of the cyclopean image is modulated according to the visual importance of each pixel defined by the just noticeable difference (JND). Finally, the 3D quality score is derived by combining the quality estimates of the cyclopean image and disparity map. Experimental results show that the proposed method outperforms many other state-of-the-art SIQA methods in terms of prediction accuracy and computational efficiency.

关键词： stereoscopic image quality assessment cyclopean image binocular rivalry/suppression just noticeable difference (JND) Stereoscopic Stereo image processing visual System BINOCULARS Imagery (Psychotherapy) Image images Image quality Quality assessment

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N-LMMSE demosaicing for spectral filter arrays 25

N-LMMSE demosaicing for spectral filter arrays

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25th Color and Imaging Conference: Color Science and Engineering Systems, Technologies, and Applications, CIC 2017

作者： Amba, Prakhar Thomas, Jean Baptiste Alleysson, David LPNC-UMR CNRS 5105 Université de Grenoble-Alpes Grenoble France Norwegian Colour and Visual Computing Laboratory NTNU Gjøvik Norway Le2i FRE CNRS 2005 Université de Bourgogne Franche-Comté Dijon France

ISBN: (纸本)9780892083282

Spectral filter array (SFA) technology requires development on demosaicing. The authors extend the linear minimum mean square error with neighborhood method to the spectral dimension. They demonstrate that the method is fast and general on Raw SFA images that span the visible and near infra-red part of the electromagnetic range. The method is quantitatively evaluated in simulation first, then the authors evaluate it on real data by the use of non-reference image quality metrics applied on each band. Resulting images show a much better reconstruction of text and high frequencies at the expense of a zipping effect, compared to the benchmark binary-tree method. © 2017 Society for Imaging Science and Technology.

关键词： Binary trees

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colour vision deficiency transforms using ICC profiles 21

Colour vision deficiency transforms using ICC profiles

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Color Imaging XXI: Displaying, Processing, Hardcopy, and Applications 2016

作者： Green, Phil Nussbaum, Peter Norwegian Colour and Visual Computing Laboratory Gjøvik University College Norway

We show how ICC profiles can be used to handle a variety of transforms intended to either simulate the appearance of a colour image to an observer with a colour vision deficiency (CVD), or adjust the image to improve the discriminability of colours to the CVD observer. In ICC v4, the different profile classes transform between a data encoding and the ICC Profile Connection Space (with the exception of the DeviceLink profile, which is a transform between two data encodings). Some simulation and Daltonization algorithms can be concatenated into a single matrix, which can be encoded as a v4 LUT-based profile or a matrix/curve profile. Alternatively a more complex transform can be encoded in the colour look-up table in a LUT-based profile. The new iccMAX architecture provides some additional possibilities, such as parameterized transforms for individual observers, encoding of functional transforms in the MPE and Calc elements, and the use of custom colorimetric observer and profile connection space. By using the ability to connect spectral data, iccMAX profiles also enable computation of the spectral response of the CVD observer to a given spectral reflectance, light source or emission. © 2016 Society for Imaging Science and Technology.

关键词： Matrix algebra

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Estimation and correction of geometric distortion in pushbroom hyperspectral system for imaging art paintings

Estimation and correction of geometric distortion in pushbro...

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Image Sensors and Imaging Systems 2016

作者： George, Sony Hardeberg, Jon Yngve Norwegian Colour and Visual Computing Laboratory Gjøvik University College Gjøvik Norway

Spectral imaging has been proved as a promising technology to perform scientific documentation and analysis of cultural heritage objects. Imaging systems used for this purpose varies in different forms and complexity. Most of the spectral devices are designed not specifically for cultural heritage imaging, but for other application domains like remote sensing, satellite imaging etc. While these imaging systems used for cultural heritage scanning, the same processing workflow may not be adequate to meet the required image quality. In this paper, we investigate one of the several quality parameters, geometrical distortions in a spectral image caused by the translation stage of the camera. For this study, we used a hyperspectral image dataset derived from a pushbroom hyperspectral imaging system attached in a rotational translator. Using geometrical model, we have estimated the distortion, which is function of the scanning angle and distance. Image correction has been proposed and tested over a number of images acquired at the laboratory and in a museum environment. © 2016 Society for Imaging Science and Technology.

关键词： Imaging systems

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Judging Aesthetic Quality in Paintings Based on Artistic Inspired Color Features

Judging Aesthetic Quality in Paintings Based on Artistic Ins...

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Proceedings of the Digital Image computing: Technqiues and Applications (DICTA)

作者： Seyed Ali Amirshahi Joachim Denzler Norwegian Colour and Visual Computing Laboratory Norwegian University of Science and Technology (NTNU) GjØvik Norway Computer Vision Group Friedrich Schiller University of Jena Jena Germany

In this work, using a new set of color features in the field of computer vision and image processing which are inspired by the work of artists, we try to classify different subjective properties of paintings, including aesthetic quality, beauty, and liking of color. We then investigate if observers have individual tastes and opinions when evaluating different properties of artworks. The extracted features are used in a 5-fold CV SVM to classify scores provided by individual observers. This work in fact, confirms that the properties which could be related to aesthetic issues in paintings are "in the eye of the beholder". In other words, using the scores provided by the individual observers, we are not only able to reach a higher classification rate but also can find which properties are important for an observer when evaluating an image. Finally, we compare our proposed color features to a set of state-of-the-art color features used in the field of computer vision.

关键词： Image color analysis Cascading style sheets Painting Wheels Observers Histograms Feature extraction

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Quality of color coding in maps for color deficient observers 21

Quality of color coding in maps for color deficient observer...

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Color Imaging XXI: Displaying, Processing, Hardcopy, and Applications 2016

作者： Kvitle, Anne Kristin Pedersen, Marius Nussbaum, Peter Colour and Visual Computing Laboratory Faculty of Computer Science and Media Technology Gjøvik University College Gjøvik Norway

For a color deficient observer, the quality of a map or other information design may be defined as the ability to extract features. As color is such important conveyor of information, the colors need to appear correct and be perceived in the desired and intended way. As color appearance is affected by the size of the stimuli, the task of discriminate colors may be even more difficult for a color vision deficient observer. In order to investigate the discriminability of the color coding in an official Norwegian map product, we conducted an experiment involving both color deficient and color normal observers. Also, we investigate to what extent the ability to discriminate colors is influenced by size of the visual field. The experiment revealed that the color vision deficient observers made significant more errors than the normal observers, especially when the visual angle was reduced. © 2016 Society for Imaging Science and Technology.

关键词： Color

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Current problems and perspectives on colour in medical imaging 21

Current problems and perspectives on colour in medical imagi...

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Color Imaging XXI: Displaying, Processing, Hardcopy, and Applications 2016

作者： Revie, W. Craig Green, Phil FFEI Limited Hemel Hempstead United Kingdom Norwegian Colour and Visual Computing Laboratory Gjøvik University College Norway

Medical practitioners are today increasingly likely to make clinical judgements based on looking at an image on a display rather than direct viewing of the subject. Medical imaging has also been moving away from exclusively grayscale modalities towards increasing use of colour. The importance of accurate calibration and reproducible image capture and display has become more apparent, but standards and best practices in this field are still in development. Since 2013, the International Color Consortium has engaged with the medical imaging community to help understand the particular problems encountered and to help develop solutions. Currently the ICC Medical Imaging Working Group is working on a wide range of topics including digital microscopy, medical displays, ophthalmology, medical photography, multispectral imaging, petri dish imaging, dermatology, skin colour measurement, and 3-D imaging for surgery. In this overview, the problems in each of these areas are summarised and the current activity is described. © 2016 Society for Imaging Science and Technology.

关键词： Medical imaging

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