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Color and quality enhancement of videoconferencing whiteboards 23

Color and quality enhancement of videoconferencing whiteboar...

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Color Imaging XXIII: Displaying, Processing, Hardcopy, and Applications 2018

作者： Andres, Carlos Duque, Arango Abebe, Mekides Assefa Shahid, Muhammad Hardeberg, Jon Yngve Norwegian Colour and Visual Computing Laboratory NTNU Norway

Whiteboards are commonly used as a medium of instant illustration of ideas during several activities including presentations, lectures, meetings, and related others through videoconferencing systems. However, the acquisition of whiteboard contents is inhibited by issues inherent to the camera technologies, the whiteboard glossy surfaces along with other environmental issues such as room lighting or camera positioning. The contents of whiteboards are mostly invisible due to the low luminance contrast and other related color degradation problems. This article presents an account of a work aimed at extracting the whiteboard image and consequently enhancing its perceptual quality and legibility. Two different methods based on color balancing and color warping are introduced to improve the global and local luminance contrast as well as color saturation of the contents. The methods are implemented based on different general models of the videoconferencing environment for avoiding color shifts and unnaturalness of results. Our evaluations, through psycho-visual experiments, reveal the significance of the proposed method’s improvements over the state of the art methods in terms of visual quality and visibility. © Society for Imaging Science and Technology 2018.

关键词： Color

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Comparative study of biorthogonal wavelets accuracy in demosaicing algorithm based on wavelet analysis of luminance component 23

Comparative study of biorthogonal wavelets accuracy in demos...

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Color Imaging XXIII: Displaying, Processing, Hardcopy, and Applications 2018

作者： Hounsou, Norbert Sanda Mahama, Amadou T. Gouton, Pierre Thomas, Jean-Baptiste University of Abomey-Calavi Institut de Mathématiques et de Sciences Physiques Dangbo Benin University of Burgundy Laboratoire Le2i Dijon France Norwegian Colour and Visual Computing Laboratory NTNU Norway

Critical issues in demosaicing are visual artifacts appearing in reconstructed images. Many algorithms have been proposed to overcome this problem. In this work, we have performed a comparative study of some conventional and recent color image demosaicing algorithms and identified experimentally the one that gives good results. From our investigation, algorithm based on wavelets analysis of the luminance component, is the best. Biorthogonal wavelets are recommended to be used in this algorithm. We then experiment famous bi-orthogonal wavelets to identify the best one. We conclude that Mallat’s bi-orthogonal wavelets give the best reconstruction results according to CPSNR and FSIMc measures. © 2018, Society for Imaging Science and Technology.

关键词： Wavelet analysis

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Validation of stereo vision based liver surface reconstruction for image guided surgery

Validation of stereo vision based liver surface reconstructi...

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colour and visual computing symposium

作者： Teatini Andrea Wang Congcong Palomar Rafael Alaya Cheikh Faouzi Beghdadi Azeddine Edwin Bjørn Elle Ole Jakob The Intervention Centre Oslo University Hospital Oslo Norway Norwegian Colour and Visual Computing Lab Norwegian University of Science and Technology Gjøvik Norway L2TI-Institut Galilée Université Paris 13 Sorbonne Paris Cité Villetaneuse France Department of Hepato-Pancreatic-Biliary surgery Oslo University Hospital Oslo Norway

Image guided surgery systems aim to provide navigation to surgeons in order to improve accuracy and safety of the procedures. Through stereo reconstruction algorithms, it is possible to generate 3D surfaces intra-operatively by means of a laparoscopic stereo-camera. This study aims to setup a simulation system and quantitatively validate a recent proposed reconstruction algorithm with application to laparoscopic liver resection surgery. The intra-operative surface will be used to guide model to patient registration. This will also improve accuracy of the navigation by correcting intra-operative deformations of the liver, such as those due to pneumoperitoneum. The accuracy results of the reconstruction method was found to be $3.7\pm 0.8$ mm in terms of Hausdorff distance. The validation therefore indicates the feasibility and accuracy of the surface reconstruction method.

关键词： Surface reconstruction Image reconstruction Liver Three-dimensional displays Computed tomography Surgery Reconstruction algorithms

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Assessing the quality of videoconferencing: From quality of service to quality of communication 15

Assessing the quality of videoconferencing: From quality of ...

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15th Image Quality and System Performance Conference, IQSP 2018

作者： Shahid, Muhammad Abebe, Mekides Assefa Hardeberg, Jon Yngve Norwegian Colour and Visual Computing Laboratory Department of Computer Science Norwegian University of Science and Technology Gjøvik Norway

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 face-to-face meetings, it is constructive to explore the associated quality of communication. One of the most significant factors to ascertain in this regard would be the assessment of the level of user satisfaction for a videoconference instead of a face-to-face meeting. Various recommendations of ITU-T related to this field (such as ITU-T Recommendation P.920) deal with subjective experiments that involve performing interactive tasks in order to quantify the impact of terminal and communication link performance. In addition to looking at different quality paradigms, in this paper, we review a number of subjective studies on videoconferences and investigate the possibilities of discovering more of the user feedback in order to assess the perceived quality of communication experienced in a videoconference. Based on the review, we present a set of future work items which can be useful in finding a comprehensive definition for quality of communication. © 2018, Society for Imaging Science and Technology.

关键词： Video conferencing

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Color characterization methods for a multispectral camera 23

Color characterization methods for a multispectral camera

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Color Imaging XXIII: Displaying, Processing, Hardcopy, and Applications 2018

作者： Khan, Haris Ahmad Green, Phil Norwegian Colour and Visual Computing Laboratory NTNU - Norwegian University of Science and Technology Gjøvik Norway Le2i FRE CNRS 2005 Univ. Bourgogne Franche-Comté Dijon France

With advances in sensor technology, the availability of multispectral cameras and their use are increasing. Having more information compared to a three-channel camera has its advantages but the data must be handled appropriately. In this work, we are interested in multispectral camera characterization. We measure the camera characterization performance by two methods, by linear mapping and through spectral reconstruction. Linear mapping is used in 3-channel camera characterization and we use the same method for a multispectral camera. We also investigate whether instead of linear mapping, spectral reconstruction from the camera data improves the performance of color reproduction. The recovery of reflectance spectra is an under-determined problem and certain assumptions are required for obtaining a unique solution. Linear methods are generally used for spectral reconstruction from the camera data and are based on training on known spectra. These methods can perform well when the test data consists of a subset of the training spectra, however, their performance is significantly reduced when the test data is different. In this paper, we also investigate the role of training spectra for camera characterization. Five different spectral reflectance datasets are used for training the camera characterization models. Finally we provide a comparison between the linear mapping and spectral reconstruction methods for multispectral camera characterization and also test the camera characterization framework on hyperspectral images of natural scenes. © 2018, Society for Imaging Science and Technology.

关键词： Cameras

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A Square Pointillism Image Generation, and its GPU Acceleration 5

A Square Pointillism Image Generation, and its GPU Accelerat...

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5th International symposium on computing and Networking (CANDAR)

作者： Tokura, Hiroki Kuroda, Yuki Ito, Yasuaki Nakano, Koji Hiroshima Univ Dept Informat Engn Kagamiyama 1-4-1 Higashihiroshima 7398527 Japan

ISBN: (纸本)9781538620878

Non-photorealistic rendering is one of the digital art techniques. It generates digital images resembling artistic representation. The main contribution of this paper is to show a non-photorealistic rendering for high quality pointillism image generation with squares by pasting square patterns on canvas. Our technique is inspired by the characteristic of the human visual system to optimize generated images. Although it can generate high quality pointillistic images, a lot of time is necessary. Hence, we have implemented our technique in a graphics processing unit (GPU) to accelerate the computation. The experimental results show that the GPU implementation can achieve a speed-up factor of 160 over the sequential CPU implementation.

关键词： Image generation Image color analysis Graphics processing units visual systems Microsoft Windows Rendering (computer graphics) Central Processing Unit Image generation central processing units Graphics Processing Unit image colour analysis Microsoft Windows(software) visual System pointillism GRAPPER PICK UP Canvas

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Image inpainting using colour and gradient features 17

Image inpainting using colour and gradient features

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Joint 17th World Congress of International-Fuzzy-Systems-Association / 9th International Conference on Soft computing and Intelligent Systems (IFSA-SCIS)

作者： Jurio, Aranzazu Paternain, Daniel Fernandez, Javier De Miguel, Laura Bustince, Humberto Univ Publ Navarra Inst Smart Cities Dept Automat & Computac Pamplona 31006 Spain

ISBN: (纸本)9781509049172

In this work we propose a new inpainting algorithm for color images. It is a patch-based algorithm that replicates some small areas across the image into the unknown area, in order to obtain a complete image with no visual differences between the original part and the reconstructed one. In this proposal we use color and gradient features to calculate the similarity between small windows of the image. The results show that our algorithm is able to obtain final results with better textures than the ones that only take into account the color features.

关键词： Color

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Content-dependent adaptation in a soft proof matching experiment 22

Content-dependent adaptation in a soft proof matching experi...

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

作者： High, Gregory Green, Phil Nussbaum, Peter Norwegian Colour and Visual Computing Laboratory Norwegian University of Science and Technology Gjøvik Norway

A 'consistent colour appearance' is hard to achieve between different substrates or display systems. A chromatic adaptation transform or substrate adjustment strategy is typically used, but for this present paper a dynamically scaled ICC Media Relative transform was utilised. A soft-proofing system with a method of adjustment was used, allowing simultaneous viewing and adjustment of a reproduction colour image relative to a reference on different simulated substrates under P2 viewing conditions. The degree of adjustment was found to be highly correlated to the image content's lightness and to lesser extent its chromaticity, and was not consistent with the complete adaptation assumed by a media-relative rendering. Other aspects of the experimental setup, including accuracy, observer strategies, and the application of soft proofing for media relative adjustments are discussed. © 2017, Society for Imaging Science and Technology.

关键词： Substrates

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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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Image quality assessment by comparing CNN features between images 14

Image quality assessment by comparing CNN features between i...

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Image Quality and System Performance XIV, IQSP 2017

作者： Amirshahi, Seyed Ali Pedersen, Marius Yu, Stella X. Berkeley United States Norwegian Colour and Visual Computing Laboratory NTNU - Norwegian University of Science and Technology Gjøvik Norway

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 Networks (CNNs). Using a pre-trained AlexNet model, we extract feature maps of the test and reference images at multiple layers, and compare their feature similarity at each layer. Such similarity scores are then pooled across layers to obtain an overall quality value. Experimental results on four state-of-the-art databases show that our metric is either on par or outperforms 10 other state-of-the-art metrics, demonstrating that CNN features at multiple levels are superior to handcrafted features used in most image quality metrics in capturing aspects that matter for discriminative perception. © 2016 Society for Imaging Science and Technology.

关键词： Image quality

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