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Item Model and Visualise the Relationship between Energy Consumption and Temperature Distribution in Cold Rooms(The Eurographics Association, 2011) Ma, Ji; Murphy, D.; O'Mathuna, C.; Hayes, M.; Provan, G.; Ian Grimstead and Hamish CarrIn the area of food and pharmacy cold storage, temperature distribution is considered as a key factor. Inappropriate distribution of temperature during the cooling process in cold rooms will cause the deterioration of the quality of products and therefore shorten their life-span. In practice, in order to maintain the distribution of temperature at an appropriate level, large amount of electrical energy has to be consumed to cool down the volume of space, based on the reading of a single temperature sensor placed in every cold room. However, it is not clear and visible that what is the change of energy consumption and temperature distribution over time. It lacks of effective tools to visualise such a phenomenon. In this poster, we initially present a solution which combines a visualisation tool with a Computational Fluid Dynamics (CFD) model together to enable users to explore such phenomenon.Item Pixel-Level Algorithms for Drawing Curves(The Eurographics Association, 2011) Liu, Yong Kui; Wang, Peng Jie; Zhao, Dan Dan; Spelic, Denis; Mongus, Domen; Zalik, Borut; Ian Grimstead and Hamish CarrThis paper introduces new pixel level algorithms for parametric curves. The optimal value of the steps is first derived when rastrerizing parametric curves. A double-step algorithm using only integer arithmetic is presented to minimize the problem of oversampling. The algorithms for parametric curves have been implemented also on GPU. Through experiments we confirmed that the performance of this new algorithm is superior to previous algorithms.Item Dynamic Video Face Transformation Using Multilinear and Autoregressive Models(The Eurographics Association, 2011) Tiddeman, Bernard; Hunter, David; Perrett, David; Ian Grimstead and Hamish CarrIn this paper we present a prototype system for altering perceived attributes of faces in video sequences, such as the apparent age, sex or emotional state. The system uses multilinear models to decompose the parameters coding for each frame into separate pose and identity parameters. The multilinear model is learnt automatically from the training video data. Statistical models of group identity are then used to alter the identity parameters from one group to another (e.g. from male to female). An autoregressive model is learnt from the pose parameters, and this is applied to alter the dynamics. We have tested our system on a small dataset (for altering apparent gender) with encouraging preliminary results.Item Evaluation of a Reconfigurable Tangible Device for Collaborative Manipulation of Objects in Virtual Reality(The Eurographics Association, 2011) Aguerreche, Laurent; Duval, Thierry; Lécuyer, Anatole; Ian Grimstead and Hamish CarrIn this paper we introduce an evaluation of a Reconfigurable Tangible Device (RTD) for collaborative manipulation of objects in virtual environments. The considered RTD, called RTD-3, has a triangular shape that naturally provides three points of manipulation. The shape of the tangible triangle can be reconfigured at any time as its branches can be shrunk or stretched by users at will. Thanks to this simple shape the RTD-3 can be easily attached to any 3D virtual object and fully defines its virtual motion in 6 Degrees of Freedom. We have conducted an experiment to assess the potential of the RTD-3 and compare it with classical techniques used for collaborative virtual manipulation. Participants were asked to manipulate and assemble, in a collaborative manner, virtual parts. Our results suggest that the physical manipulation proposed by the tangible device is significantly preferred by participants in terms of immersion, realism of interaction and preparation to the real task. Although our approach is slightly slower than the other tested methods, it produces the fewest collisions.Item Visual Saliency for Smell Impulses and Application to Selective Rendering(The Eurographics Association, 2011) Harvey, Carlo; Bashford-Rogers, Thomas E. W.; Debattista, Kurt; Chalmers, Alan; Ian Grimstead and Hamish CarrA major challenge in generating high-fidelity virtual environments is to be able to provide interactive rates of realism. However this is very computationally demanding and only recently visual perception has been used in high-fidelity rendering to improve performance considerably by a series of novel exploitations; to render parts of the scene that are not currently being attended by the viewer at a much lower quality without the difference being perceived. This paper investigates the effect various smells have on the visual attention of the user when free viewing a set of engineered images. We verify the worth of investigating these saccade shifts (fast movements of the eyes) due to attention distraction to a congruent smell object. By analysing the gaze points, we identify time spent attending a particular area of a scene. We also present a technique from measured data to remodulate traditional saliency maps of image features to account for the observed results. We show that smell provides an impulse on attention to affect perception in such a way that this can be used to guide selective rendering of scenes through use of the remodulated saliency maps.Item Morphological Analysis from Images of Hyphal Growth using a Fractional Dynamic Model(The Eurographics Association, 2011) Blackledge, Jonathan M.; Barry, D. J.; Ian Grimstead and Hamish CarrThe development of methods capable of accurately characterising the morphology of filamentous microbes represents a significant challenge to biotechnologists. This is because the productivity of many industrial fermentation processes is heavily dependent on the morphological form adopted by an organism. It is therefore of significant value if a quantitative model and associated metric(s) for morphological forms determined by complex phenotypes can be determined non-invasively, e.g. through image analysis. Specific interest is in the quantification of the branching behaviour of an organism. This is due to the link between branching frequency, biomass and metabolite production. In this paper we present a model for three-dimensional microbial growth that is based on a fractional dynamic model involving separable coordinate geometry. This provides the focus for the approach reported in this paper where microbial growth can be quantified using a sample microscopic digital image. In particular, we study the fractal dimension of fungal mycelial structures by generating a 'fractal signal' based on the object boundary. In the analysis of a population of Aspergillus oryzae mycelia, both the fractal dimension and hyphal growth unit are found to increase together over time. Further, through an extensive analysis of different populations of Penicillium chrysogenum and A. oryzae mycelia, cultivated under a variety of different conditions, we show that there is a statistically significant logarithmic correlation between the boundary fractal dimension and hyphal growth unit.Item Building a Video Wall for Earth Observation Data(The Eurographics Association, 2011) Bennett, Victoria; Haffegee, Adrian; Matthews, Brian; Nagella, Srikanth; Shaw, Andrew; Styles, Jon; Ian Grimstead and Hamish CarrEarth observation satellites are generating large amounts of data as they monitor the earth' environment. Large scale visualisation represents a powerful mechanism to explore and communicate this data; however, conventional tools and screens are limited by their size, while large shared screens are limited in their resolution. In this paper, we describe the motivations and design for a multi-panel video wall facility for the new International Space Innovation Centre. We further describe two visualisation applications which have been designed to demonstrate some of the potential of this wall to share data visualisations with a large audience, while providing a highly detailed view on the data.Item Enabling Visualization of Massive Datasets Through MPP Database Architecture(The Eurographics Association, 2011) Al-Naser, Aqeel; Rasheed, Masroor; Brooke, John; Irving, Duncan; Ian Grimstead and Hamish CarrWe are developing a novel visualization architecture which is specifically designed to render very large (terabyte scale) datasets. Our method differs from the classic visualization pipeline of Harber and McNabb. In particular we eliminate the need to create geometric objects, for example surfaces composed of polygons, as a stage before rendering. Such objects require specialist HPC servers for their creation and manipulation; our solution eliminates the need for such servers. We replace the geometric objects by structures stored and tagged in a database next to the original dataset; we call these Spatially Registered Data Structures (SRDS). Such structures are linked to a single rendering pipeline through the on-the-fly creation of a Feature Embedded Spatial Volume (FESVo). This solution exploits recently developed capabilities of in-database Massive Parallel Processing (MPP) and parallel data streaming, together with the rapidly developing capabilities of GPUs. We describe an early prototype of an architecture applied to seismic data from the oil and gas industry.Item A Desktop Multi-Touch Interface for Posing Characters(The Eurographics Association, 2011) Stephenson, Ian; Ian Grimstead and Hamish CarrMulti-touch, direct manipulation interfaces have become common in mobile media applications, but their use on the desktop is limited. In this paper we propose that multi touch direct manipulation is well suited to the posing of animated characters using inverse kinematics, and demonstrate how it can be implemented in a desktop application, by the addition of commodity mobile touch devices. We also describe how the multi-touch display software developed for this system can be integrated into a number of other applications.Item Simple and Efficient Normal Encoding with Error Bounds(The Eurographics Association, 2011) Schinko, Christoph; Ullrich, Torsten; Fellner, Dieter W.; Ian Grimstead and Hamish CarrNormal maps and bump maps are commonly used techniques to make 3D scenes more realistic. Consequently, the efficient storage of normal vectors is an important task in computer graphics. This work presents a fast, lossy compression/decompression algorithm for arbitrary resolutions. The complete source code is listed in the appendix and is ready to use.