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Enhancement of moment based painterly rendering using connected components

Enhancement of moment based painterly rendering using connec...

引用

International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Obaid, M. Mukundan, R. Bell, T. Department of Computer Science and Software Engineering University of Canterbury Christchurch New Zealand

ISBN: (纸本)0769526063

Moment functions have been used recently to compute stroke parameters for painterly rendering applications. The technique is based on the estimation of geometric features of the intensity distribution in small windowed images to obtain the brush size, colour and direction. This paper proposes an improvement of this method, by additionally extracting the connected components so that adjacent regions of similar colour are grouped for generating large and noticeable brush stroke images. An iterative coarse-to-fine rendering algorithm is used for painting regions of varying colour frequencies. Performance improvements over the existing technique are discussed with several examples. © 2006 IEEE.

关键词： computer graphics

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Human-focused computer vision applications

Human-focused computer vision applications

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Piccardi, Massimo Department of Computer Systems Faculty of IT University of Technology Sydney Australia UTS Computer Vision Research Group IEEE IEEE Computer Society International Association for Pattern Recognition

ISBN: (纸本)0769526063

Recent years have seen an increasing number of computer vision applications focusing on humans as their objects of interest. Such applications include video surveillance, domotics, multimedia semantic annotation and indexing, human-computer interfaces, affective computing, just to cite a few. What exactly are their "objects of interest"? A broad range of human-related features: motion, gestures, actions, interactions, activities, attitudes, behaviours, identity. This keynote will offer a survey of this field and present some current work from the speaker and his collaborators in the areas of emotion recognition and people tracking within camera networks. © 2006 IEEE.

关键词： computer vision

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3D archaeological reconstruction and visualisation: An artificial life model for determining vegetation dispersal patterns in ancient landscapes

3D archaeological reconstruction and visualisation: An artif...

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Ch'ng, Eugene Stone, Robert J. Department of Electronic Electrical and Computer Engineering School of Engineering University of Birmingham Edgbaston B15 2TT United Kingdom

ISBN: (纸本)0769526063

This paper describes a methodology and software engine for generating dynamic vegetation models for archaeological reconstruction and interactive visualisation, integrating the disciplines of Artificial Life (Alife) and Virtual Reality. The engine, based on the concept of emergence (a phenomenon in complex Alife systems), uses real botanical parameters, channelled through simple rules, in order to synthesise the dispersal patterns of natural vegetation communities as they grow, reproduce, and compete for resources. The foci for the development and evaluation of the Alife engine described relate to different scenarios in nature as may have existed during the Mesolithic period. Results from the study showed evidence of correlations between the artificial vegetation and their natural counterparts, demonstrating the feasibility of using such models in historical landscape reconstructions. © 2006 IEEE.

关键词： Image reconstruction

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Cybersecurity for SMEs: Introducing the Human Element into Socio-technical Cybersecurity Risk Assessment 16

Cybersecurity for SMEs: Introducing the Human Element into S...

引用

16th International Joint conference on computer Vision, imaging and computer graphics Theory and Applications (VISIGRAPP) / 12th International conference on Information Visualization Theory and Applications (IVAPP)

作者： Boletsis, Costas Halvorsrud, Ragnhild Pickering, J. Brian Phillips, Stephen Surridge, Mike SINTEF Digital Oslo Norway Univ Southampton IT Innovat Ctr Southampton Hants England

ISBN: (纸本)9789897584886

Small and medium-sized enterprises (SMEs) rarely conduct a thorough cyber-risk assessment and they may face various internal issues when attempting to set up cyber-risk strategies. In this work, we apply a user journey approach to model human behaviour and visually map SMEs' practices and threats, along with a visualisation of the socio-technical actor network, targeted specifically at the risks highlighted in the user journey. By using a combination of cybersecurity-related visualisations, our goals are: i) to raise awareness about cybersecurity, and ii) to improve communication among IT personnel, security experts, and non-technical personnel. To achieve these goals, we combine two modelling languages: Customer Journey Modelling Language (CJML) is a visual language for modelling and visualisation of work processes in terms of user journeys. System Security Modeller (SSM) is an asset-based risk-analysis tool for socio-technical systems. By demonstrating the languages' supplementary nature through a threat scenario and considering related theories, we believe that there is a sound basis to warrant further validation of CJML and SSM together to raise awareness and handle cyber threats in SMEs.

关键词： Cybersecurity Modelling Socio-technical Risk Assessment User Journey visualisation

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Variants of a new volumetric model for dust cloud representation and their comparison to existing methods

Variants of a new volumetric model for dust cloud representa...

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Carr, David N. Geyer, Jim Centre for Research in Complex Systems Charles Sturt University

ISBN: (纸本)0769526063

To date, the techniques used in most real-time graphics applications (eg. computer games) for modelling and representing dust clouds, centre around the use of flat, pre-drawn sprites, layered onto the screen as 'billboards'. While this can produce an adequate effect, it is not a very realistic representation. This paper presents a new method, based on an octree space-partitioning scheme for fast and memory-efficient storage of volumetric data. This approach differs from the billboards-based methods previously used, in that it attempts to properly represent the three-dimensional volume of the cloud. Two variants are presented, that differ in the algorithm used to construct the volumetric representation. Models visualising the dust cloud created by a fast travelling vehicle, are implemented and compared with the existing real-time methods. © 2006 IEEE.

关键词： computer graphics

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Stretch it - Realistic smooth skinning

Stretch it - Realistic smooth skinning

引用

International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Yang, Xiaosong Zhang, Jian J. National Centre for Computer Animation Bournemouth Media School Bournemouth University United Kingdom

ISBN: (纸本)0769526063

Smooth Skinning is still the most popular method for the animation of deformable human and creature characters. It has became almost an industry standard because of its intuitiveness to use and efficiency to compute. However it suffers from a number of problems, such as the collapsing elbow and candywrapper effect. In this paper, we present a new method, which is able to solve these defects with very little extra stretching computations. The advantage of this method is its compatibility with the current animation workflow. The animator can change the skin weight any way they like and therefore it favours creativity. The aim of our method is trying to retain the realism and computational efficiency at the same time. It is suitable for situations, where real time response is necessary, like computer games. A practical implementation in the form of a Maya plug-in is created to demonstrate the viability of the method. © 2006 IEEE.

关键词： computer graphics

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Bottled sand movies

Bottled sand movies

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Carvalho, Bruno M. Neto, Laurindo S. Britto Oliveira, Lucas M. Departamento de Informática e Matemática Aplicada Universidade Federal do Rio Grande do Norte Brazil

ISBN: (纸本)0769526063

Non-Photorealistic Rendering (NPR) is a class of techniques defined by what they do not aim, the realistic rendering of artificial scenes. NPR techniques, on the other hand, aim to reproduce artistic techniques renderings, trying to express feelings and moods on the rendered scenes. This paper introduces a new style of NPR based on a typical art craft from the northeastern region of Brazil, that uses colored sand to compose landscapes inside glass bottles. A method for generating two-dimensional (2D) virtual sand textures is introduced, as well as techniques for combining them in a point-by-point or in an area basis. © 2006 IEEE.

关键词： computer graphics

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Positivity-preserving scattered data interpolating surface using C1 piecewise cubic triangular patches

Positivity-preserving scattered data interpolating surface u...

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Saaban, Azizan Piah, Abd. Rahni Mt. Majid, Ahmad Abd School of Mathematical Sciences Universiti Sains Malaysia 11800 USM Pulau Pinang Malaysia

ISBN: (纸本)0769526063

The construction of a bivariate C1 interpolant to scattered data is considered in which the interpolant is positive everywhere if the original data are positive. This study is motivated by earlier work in which sufficient conditions are derived on Bézier points in order to ensure that surfaces comprising cubic Bézier triangular patches are always positive and satisfy C1 continuity conditions. Initial gradients at the data sites are estimated and then modified if necessary to ensure that these conditions are satisfied. The construction is local and easy to implement. Graphical examples are presented using two test functions. © 2006 IEEE.

关键词： computer graphics

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Challenges to the ubiquity of perspective since the photograph: an essay on alternatives and alterations 22

Challenges to the ubiquity of perspective since the photogra...

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22nd International conference Information visualisation (IV) - Biomedical Visualization, visualisation on Built and Rural Environments and Geometric Modelling and imaging

作者： Wyeld, Theodor Flinders Univ S Australia Adelaide SA Australia

ISBN: (纸本)9781538672020

The perspective image, first formularized in the fourteenth century Italian Renaissance, was chemically automated by the photograph in the mid-nineteenth century. While at its zenith, the Dutch realists had achieved astonishingly mimetic reproduction of the visual world in their paintings, the photograph threatened to automate and commodify their work. The unerring catch-all monotony of the scenes depicted in early photography also questioned the value artists invested in what they included in their paintings. As such, many artists rejected the photograph, and perspective realisms more generally. From the mid-nineteen century to the late twentieth century, many challenges to the verisimilitudinal nature of the photograph and perspective image were mounted. These ranged from impressionist patches of light and dark, patches of colour, compression of space to the surface of the painting, layering of multiple temporal images in a single frame, to the complete voiding of spatial references altogether. Their campaigns waged across the twentieth century, computer graphics (CG) has since reestablished the perspective image as a dominant media. However, CGs too has its alternatives and alterations which generate new effects, both extending and challenging its presumed norms. This paper is a brief essay about the cycle that has been the dominance, decline and reemergence of the perspective image since the Renaissance.

关键词： Renaissance Perspective Photograph computer graphics Impressionists Abstract Expressionists Cubists

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A scalable algorithm for adjusting node-node overlaps

A scalable algorithm for adjusting node-node overlaps

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Huang, Xiaodi Sajeev, A.S.M. Lai, Wei Department of Mathematics Statistics and Computer Science University of New England Australia Faulty of Information and Communication Technologies Swinburne University of Technology

ISBN: (纸本)0769526063

The node-node overlaps, which occur in drawing of labeled graphs, and more importantly, in the dynamic drawing, have been a problem in graph visualization. Several approaches have recently been proposed to solve such a problem. These approaches, however, lack the scalabilities of dealing with large number of overlapping nodes. Providing a formal description of the problem, this paper presents a scalable version of our previous approach called the Force-Transfer algorithm. Compared to other methods, our new algorithm is able to achieve the compact adjusted layout of a large graph. © 2006 IEEE.

关键词： Graph theory

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