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Spectral gamut mapping and ink separation with fluorescing substrates

Spectral gamut mapping and ink separation with fluorescing s...

引用

colour and visual computing symposium (CVCS)

作者： Coppel, Ludovic Gustafsson Gjovik Univ Coll Norwegian Colour & Visual Comp Lab Teknol Veien 22 N-2815 Gjovik Norway

ISBN: (纸本)9781479917655

Spectral workflows in printing aim at achieving an illuminant-invariant visual match between an original and its reproduction and require the spectral reflectance of the original as input. When printing on a fluorescing substrate, the reflectance factor of the reproduction is however no longer independent of the illumination. In the present work, we propose an extension of a spectral gamut mapping and separation algorithm accounting for the fluorescence of the substrate. The forward model relies on an extended Neugebauer model accounting for the attenuation by the ink halftones of the incident excitation radiation and emitted light. The algorithm searches for all reproducible paramers of each particular target under one spectral power distribution (SPD) with UV included and minimize the colour difference under subsequent SPDs. We test the framework on a set of 1269 Munsell patches by simulating the output of a CMYKRGB printer on a fluorescing paper and show that the proposed framework leads to significantly lower multi-illuminant colour differences as compared to a framework only taking as input the measured spectral reflectance in one single SPD.

关键词： gamut mapping CHROMATIC ABERRATION spectral reflectance reflectance factor Ink Reproduction Frameworks Substrates Printing ORIGINAL

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HYPERSPECTRAL CRACK DETECTION IN PAINTINGS

HYPERSPECTRAL CRACK DETECTION IN PAINTINGS

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colour and visual computing symposium (CVCS)

作者： Deborah, Hilda Richard, Noel Hardeberg, Jon Yngve Univ Poitiers Lab XLIM SIC UMR CNRS 7252 F-86962 Futuroscope France Gjovik Univ Coll Fac Comp Sci & Media Technol Norwegian Colour & Visual Comp Lab N-2802 Gjovik Norway

ISBN: (纸本)9781479917655

Several approaches to the crack detection of paintings are available for grayscale and color images, and recently also for spectral images. However, the approaches that are used for the multivariate data are either using a marginal approach or requiring a data reduction which enable the use of grayscale operators. In this study, the crack detection task is addressed with a spectral processing expressed in a full-band and vector approach. By using distance functions in the ordering relations and crack detection method, the metrological constraints required by such important cultural heritage objects are respected. The performances of the crack detection methods are assessed with artificial images which combine real spectral images of known properties and simple probabilistic crack model, and also with images from cracked paintings.

关键词： hyperspectral images morphological operations metrology

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DIVERGENCE-BASED colour FEATURES FOR MELANOMA DETECTION

DIVERGENCE-BASED COLOUR FEATURES FOR MELANOMA DETECTION

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colour and visual computing symposium (CVCS)

作者： Mollersen, Kajsa Hardeberg, Jon Yngve Godtliebsen, Fred Univ Hosp North Norway Norwegian Ctr Integrated Care & Telemed N-9038 Tromso Norway Gjovik Univ Coll Fac Comp Sci & Media Technol N-2815 Gjovik Norway UiT Arctic Univ Norway Dept Math & Stat N-9037 Tromso Norway

ISBN: (纸本)9781479917655

Melanoma is a deadly form of skin cancer which is difficult to detect in its early stages. Several computer-aided diagnostic systems based on dermoscopic images of skin lesions intend to improve melanoma detection. colour is an important factor in correctly classifying a skin lesion. Here, we introduce divergence-based colour features, using the Kullback-Leibler information as a preferred divergence function. These features are based on the divergence between the distribution of the pixel values of a lesion image, and that of the pixel values of either a benign or a malignant model. The features' sensitivities and specificities are reported, along with the contribution to an existing classifier for skin lesions. The features improve the performance of the existing classifier and are therefore relevant for melanoma detection.

关键词： Melanoma colour feature Divergence Kullback-Leibler Gaussian mixture distribution

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Development and Evaluation of a Hybrid Point-wise Gamut Mapping Framework

Development and Evaluation of a Hybrid Point-wise Gamut Mapp...

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colour and visual computing symposium (CVCS)

作者： Yuan, Jiangping Hardeberg, Jon Y. Chen, Guangxue Gjovik Univ Coll Norwegian Colour & Visual Comp Lab Gjovik Norway S China Univ Technol State Key Lab Pulp & Paper Engn Guangzhou Guangdong Peoples R China

ISBN: (纸本)9781479917655

For point-wise gamut mapping, the largest challenge is how to preserve both detail and saturation with state of the art gamut mapping algorithms based on the main concepts of gamut clipping or gamut compression. Based on a combination of clipping and compression algorithms, a hybrid point-wise gamut mapping framework is proposed and evaluated in this paper. Using five standard scenes, five combination ratios, our framework based on cusp point is evaluated. According to the subjective experiment results, the trend of accuracy scale and preference scale were indicated first decreasing stage and second increasing stage, and its turning point is mainly 50% ratio scale. Three objective image quality metrics were further used to correlate and analyze the above special phenomenon clearly.

关键词： color gamut mapping gamut mapping algorithm gamut compression gamut clipping

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STRESS FOR DEHAZING

STRESS FOR DEHAZING

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colour and visual computing symposium (CVCS)

作者： de Dravo, Vincent Whannou Hardeberg, Jon Yngve Gjovik Univ Coll Norwegian Colour & Visual Comp Lab Gjovik Norway

ISBN: (纸本)9781479917655

Today, there are typically two main approaches for dehazing, that is, enhancing images taken in hazy or foggy conditions. The first method is based on general image enhancement techniques where algorithms such as histogram equalization or Retinex are often used. The second one, uses an image restoration approach through the building of a haze physical model. In this paper, we make the dehazing task with a new image enhancement framework named STRESS (Kolas et al., JIST, 55(4), 2011) which has some specificities similar to the Retinex algorithm and we compare it with some of state-of-the-art dehazing algorithms. According to the experiment the approximation for certain images given by the haze physical model was not the most accurate one and STRESS model turned out to be better than almost any state-of-the-art algorithms in term of the quality of the images output, especially as far as homogeneous (dense) haze was taken into consideration.

关键词： Dehazing Stress (mechanics) image restoration technique image enhancement technique Haze images physical models

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MULTILEVEL HALFTONING AS AN ALGORITHM TO CONTROL INK OVERLAP IN MULTI-CHANNEL PRINTING

MULTILEVEL HALFTONING AS AN ALGORITHM TO CONTROL INK OVERLAP...

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colour and visual computing symposium (CVCS)

作者： Elias, Paula Zitinski Gooran, Sasan Nystrom, Daniel Linkoping Univ Dept Sci & Technol Norrkoping Sweden

ISBN: (纸本)9781479917655

A multilevel halftoning algorithm can be used to overcome some of the challenges of multi-channel printing. In this algorithm, each channel is processed so that it can be printed using multiple inks of approximately the same hue, achieving a single ink layer. The computation of the threshold values required for ink separation and dot gain compensation pose an interesting challenge. Since the dot gain depends on the specific combination of ink, paper and print resolution, compensating the original image for multilevel halftoning means expressing the dot gain of multiple inks of same hue in terms of the coverage of a single ink. The applicability of the proposed multilevel halftoning workflow is demonstrated using chromatic inks while avoiding dot overlap and accounting for dot gain. The results indicate that the multilevel halftoned image is visually improved in terms of graininess when compared to bi-level halftoned images.

关键词： halftoning algorithms multi-channel printing dot gain graininess colour accuracy

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Comparative study of endoscopic image enhancement techniques

Comparative study of endoscopic image enhancement techniques

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colour and visual computing symposium, CVCS 2015

作者： Sdiri, Bilel Cheikh, Faouzi Alaya Dragusha, Kushtrim Beghdadi, Azeddine The Norwegian Colour and Visual Computing Lab Gjovik University College Gjovik Norway Laboratory of Information Processing and Transmission Université Paris 13 Sorbonne Paris Cité Paris France

ISBN: (纸本)9781479917655

Endoscopic image enhancement has become a popular research area after the success of minimally invasive interventions and the innovation of new technological diagnosis tools such as the wireless capsule endoscopy. In spite of the great advances achieved in image processing and enhancement, only few techniques can be adapted for endoscopic images. This can be explained by the specifications of the acquisition process and the special characteristics of the endoscopic environment. This paper presents a comparative study of image enhancement techniques for endoscopic images. We propose then a new enhancement process producing better results in terms of endoscopic stereo matching and wireless endoscopy images classification. © 2015 IEEE.

关键词： Image enhancement

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Spectral gamut mapping and ink separation with fluorescing substrates

Spectral gamut mapping and ink separation with fluorescing s...

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colour and visual computing symposium

作者： Ludovic Gustafsson Coppel Gjøvik University College Teknologiveien 22 The Norwegian Colour and Visual Computing Laboratory Gjøvik Norway

关键词： Image color analysis Substrates Lighting Ink Printing Printers Color

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Comparative study of endoscopic image enhancement techniques

Comparative study of endoscopic image enhancement techniques

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colour and visual computing symposium

作者： Bilel Sdiri Faouzi Alaya Cheikh Kushtrim Dragusha Azeddine Beghdadi Gjøvik University College The Norwegian Colour and Visual Computing Lab Gjøvik Norway Laboratory of Information Processing and Transmission Sorbonne Paris Cité Paris France

关键词： Image color analysis Image enhancement Endoscopes Surgery Histograms Wireless communication Image classification

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The customized daltonization method using discernible colour bins

The customized daltonization method using discernible colour...

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colour and visual computing symposium

作者： Neda Milić Farès Belhadj Novaković Dragoljub Department of Graphic Engineering and Design University of Novi Sad Novi Sad Serbia Laboratoire d'Informatique Avancée LIASD Université Paris 8 Paris France

Contemporary media entail colour-coded information. While an average viewer takes colour images for granted, individuals with colour vision deficiency have difficulties in discriminating certain colour combinations and, consequently, have difficulties in perceiving image features. Well-established simulation tools allow us to see the image from their perspective that goes beyond the stereotypical inability to tell red from green by affecting the perception of the entire spectrum. Daltonization methods utilise these simulations to enhance the perceptual image quality for the target population. The paper presents a new concept of daltonization based on finding the optimal choice of discernible colour bins for each image. Similar to other contentdependent methods, the used remapping balances between colour contrast enhancement and naturalness preservation. By providing type and severity of the deficiency and the preferable contrast-naturalness balance and as input parameters, the method can be customized for a particular colour deficient individual.

关键词： Image color analysis Image segmentation Accuracy Sensitivity Computational modeling visualization

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