46,378 research outputs found
Shape from Texture unter dem Aspekt des Visual Computing
No full textIn the area of image analysis, many different strategies are used to derive shape from an image or image swquences, i.e. Shape from Stereo, Shape from Motion, Shape from Shading, Shape from Texture, etc. All these algorithms have an equivalent within the human visual system. Recovering 3D information from a single monocular image is impossible in the general case. However in many cases the use of additional knowledge facilitate the reconstruction of objects shape. In the area of Scientific Visualization, new techniques are examined which can enhance the quality of presentations. The question which perceptual parameters are best suited to carry information is still unsolved to a very high degree. A specific problem in this context is the optimal presentation of objects in 3D space. This means, shape, position, and orientationof an object in space shall be determined by and observer most exactly and easily. This topic is especially interesting in Virtual Reality applications. An important visual cue for this task is texture. However, exact models which descibe the effect of texture in a quantitative manner do not exist. Hence, a methodical selection and viariation of textrues for this application is not possible. In [revious appoaches these two problems have been tackled separately in Image Analysis and Image Synthesis, although there is a great deal of commulality. In contrast to this, we regard the aspect of texture in 3D space in the areas of Image Analysis, Computer Vision, and Scientific Visualization as a general problem related to the field of Visual Computing
Exponential Rosenbrock Methods and Their Application in Visual Computing
No full textWe introduce a class of explicit exponential Rosenbrock methods for the time integration of large systems of stiff differential equations. Their application with respect to simulation tasks in the field of visual computing is discussed where these time integrators have shown to be very competitive compared to standard techniques. In particular, we address the simulation of elastic and nonelastic deformations as well as collision scenarios focusing on relevant aspects like stability and energy conservation, large stiffnesses, high fidelity and visual accuracy.The first author has been partially supported by NSF grant DMS–2012022. The second author has been partially supported by King Abdullah University of Science and Technology (KAUST baseline funding)
Keyframe detection in visual lifelogs
No full textThe SenseCam is a wearable camera that passively captures images. Therefore, it requires no conscious effort by a user in taking a photo. A Visual Diary from such a source could prove to be a valuable tool in assisting the elderly, individuals with neurodegenerative diseases, or other traumas. One issue with Visual Lifelogs is the large volume of image data generated. In previous work we spit a day's worth of images into more manageable segments, i.e. into distinct events or activities. However, each event coud stil consist of 80-100 images. thus, in this paper we propose a novel approach to selecting the key images within an event using a combination of MPEG-7 and Scale Invariant Feature Transform (SIFT) features
Designable visual markers
No full textVisual markers are graphic symbols designed to be easily recognised by machines. They are traditionally used to track goods, but there is increasing interest in their application to mobile HCI. By scanning a visual marker through a camera phone users can retrieve localised information and access mobile services.One missed opportunity in current visual marker systems is that the markers themselves cannot be visually designed, they are not expressive to humans, and thus fail to convey information before being scanned. This paper provides an overview of d-touch, an open source system that allows users to create their own markers, controlling their aesthetic qualities. The system runs in real-time on mobile phones and desktop computers. To increase computational efficiency d-touch imposes constraints on the design of the markers in terms of the relationship of dark and light regions in the symbols. We report a user study in which pairs of novice users generated between 3 and 27 valid and expressive markers within one hour of being introduced to the system, demonstrating its flexibility and ease of use
A grid computing framework for commercial simulation packages
No full textThis thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.An increased need for collaborative research among different organizations, together with continuing advances in communication technology and computer hardware, has facilitated the development of distributed systems that can provide users non-trivial access to geographically dispersed computing resources (processors, storage, applications, data, instruments, etc.) that are administered in multiple computer domains. The term grid computing or grids is popularly used to refer to such distributed systems. A broader definition of grid computing includes the use of computing resources within an organization for running organization-specific applications. This research is in the context of using grid computing within an enterprise to maximize the use of available hardware and software resources for processing enterprise applications. Large scale scientific simulations have traditionally been the primary benefactor of grid computing. The application of this technology to simulation in industry has, however, been negligible. This research investigates how grid technology can be effectively exploited by simulation practitioners using Windows-based commercially available simulation packages to model simulations in industry. These packages are commonly referred to as Commercial Off-The-Shelf (COTS) Simulation Packages (CSPs). The study identifies several higher level grid services that could be potentially used to support the practise of simulation in industry. It proposes a grid computing framework to investigate these services in the context of CSP-based simulations. This framework is called the CSP-Grid Computing (CSP-GC) Framework. Each identified higher level grid service in this framework is referred to as a CSP-specific service. A total of six case studies are presented to experimentally evaluate how grid computing technologies can be used together with unmodified simulation packages to support some of the CSP-specific services. The contribution of this thesis is the CSP-GC framework that identifies how simulation practise in industry may benefit from the use of grid technology. A further contribution is the recognition of specific grid computing software (grid middleware) that can possibly be used together with existing CSPs to provide grid support. With its focus on end-users and end-user tools, it is intended that this research will encourage wider adoption of grid computing in the workplace and that simulation users will derive benefit from using this technology
Proceedings of the International Summer School on Visual Computing 2015
No full textThe research field of Visual Computing encompasses everything graphical in computer science - from the synthesis and processing of graphical content to its human consumption. This broad spectrum includes multiple other fields that constitute research disciplines in their own right, such as perception, visualization, multimedia, virtual and augmented reality, as well as human-computer interaction. The first International Summer School on Visual Computing held from August 17-21, 2015 at the Fraunhofer IGD Rostock, Germany aimed to give an overview of this broad field to graduate students from Rostock, Germany, and abroad. A week-long program of lectures and research talks by invited speakers introduced participating students into the subjects of visual perception and cognition, eye tracking, raster image databases, multimedia retrieval, computer vision, human-computer-interaction, mobile and wearable computing, and visual analytics. Each afternoon, the participating students had the opportunity to present their own research in posters and talks. Sessions with helpful tips and tricks on how to go about PhD level research, writing, and presentation, as well as an open lab tour rounded off the summer school program
Explicit Exponential Rosenbrock Methods and their Application in Visual Computing
No full textWe introduce a class of explicit exponential Rosenbrock methods for the time integration of large systems of stiff differential equations. Their application with respect to simulation tasks in the field of visual computing is discussed where these time integrators have shown to be very competitive compared to standard techniques. In particular, we address the simulation of elastic and nonelastic deformations as well as collision scenarios focusing on relevant aspects like stability and energy conservation, large stiffnesses, high fidelity and visual accuracy
Exploiting Yahoo: Pipes to Teach Computing Concepts
No full textEducators always encounter challenges to teach computing concepts to students with different educational backgrounds and computing experience. In this paper the author attempts to explore methods to improve the teaching of computing concepts using Yahoo! Pipes to students with no prior programming experience. The author uses Yahoo! Pipes to teach various computing concepts and makes use of familiar applications that are easy to develop, fun to use and strengthen the student's motivation to learn
Footprints of information foragers: Behaviour semantics of visual exploration
No full textSocial navigation exploits the knowledge and experience of peer users of information resources. A wide variety of visual–spatial approaches become increasingly popular as a means to optimize information access as well as to foster and sustain a virtual community among geographically distributed users. An information landscape is among the most appealing design options of representing and communicating the essence of distributed information resources to users. A fundamental and challenging issue is how an information landscape can be designed such that it will not only preserve the essence of the underlying information structure, but also accommodate the diversity of individual users. The majority of research in social navigation has been focusing on how to extract useful information from what is in common between users' profiles, their interests and preferences. In this article, we explore the role of modelling sequential behaviour patterns of users in augmenting social navigation in thematic landscapes. In particular, we compare and analyse the trails of individual users in thematic spaces along with their cognitive ability measures. We are interested in whether such trails can provide useful guidance for social navigation if they are embedded in a visual–spatial environment. Furthermore, we are interested in whether such information can help users to learn from each other, for example, from the ones who have been successful in retrieving documents. In this article, we first describe how users' trails in sessions of an experimental study of visual information retrieval can be characterized by Hidden Markov Models. Trails of users with the most successful retrieval performance are used to estimate parameters of such models. Optimal virtual trails generated from the models are visualized and animated as if they were actual trails of individual users in order to highlight behavioural patterns that may foster social navigation. The findings of the research will provide direct input to the design of social navigation systems as well as to enrich theories of social navigation in a wider context. These findings will lead to the further development and consolidation of a tightly coupled paradigm of spatial, semantic and social navigation
On the Lorentz degree of a product of polynomials
No full textIn this note, we negatively answer two questions of T. Erdélyi (1991, 2010) on possible lower bounds on the Lorentz degree of product of two polynomials. We show that the correctness of one question for degree two polynomials is a direct consequence of a result of Barnard et al. (1991) on polynomials with nonnegative coefficients.This research was supported by the KAUST Visual Computing Center. The author is grateful to the referees for the many helpful comments that improved the presentation of this work
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