A novel framework is proposed to capture the variability in end user designed gestures and extract archetypal patterns from a pool of gestures sourced from multiple participants. The primary objective is to identify a...
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ISBN:
(纸本)9781450325257
A novel framework is proposed to capture the variability in end user designed gestures and extract archetypal patterns from a pool of gestures sourced from multiple participants. The primary objective is to identify a gesture library that is preferred by the end user population so as to control a human avatar in a 3D virtual environment using whole-of-body gestures. By adapting a group based user centric study, different gesture designs from 36 participants were elicited. Analysis shows that the existing techniques are incapable of extracting archetypal patterns in gestures from such an unconstrained gesture space. As such, a formal notation, followed by hierarchical clustering, is used to provide an abstract representation of gesture designs and then to distil the archetypal gesture patterns from the pool of highly variable gestures. User acceptance of the extracted gestures was performed for validation and common motion patterns were identified from the provided user ratings. The gesture library selected by the framework is compared against the gesture library extracted based on the user ranking, and the similarities and differences between two gesture libraries are presented.
This paper describes an approach for the organization and simplification of high-resolution geometry and imagery data for 3D buildings for interactive city navigation. At the highest level of organization, building da...
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This paper describes an approach for the organization and simplification of high-resolution geometry and imagery data for 3D buildings for interactive city navigation. At the highest level of organization, building data are inserted into a global hierarchy that supports the large-scale storage of cities around the world. This structure also provides fast access to the data suitable for interactive visualization. At this level the structure and simplification algorithms deal with city blocks. An associated latitude and longitude coordinate for each block is used to place it in the hierarchy. Each block is decomposed into building facades. A facade is a texture-mapped polygonal mesh representing one side of a city block. Therefore, a block typically contains four facades, but it may contain more. The facades are partitioned into relatively flat surfaces called faces. A texture-mapped polygonal mesh represents the building facades. By simplifying the faces first instead of the facades, the dominant characteristics of the building geometry are maintained. At the lowest level of detail, each face is simplified into a single texture-mapped polygon. An algorithm is presented for the simplification transition between the high- and low-detail representations of the faces. Other techniques for the simplification of entire blocks and even cities are discussed.
Rendering computer animation frames is a very time consuming job. Using parallel computing on clusters and so-called render farms is a common solution to this problem. In this paper we describe how Grid computing can ...
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ISBN:
(纸本)1595935649
Rendering computer animation frames is a very time consuming job. Using parallel computing on clusters and so-called render farms is a common solution to this problem. In this paper we describe how Grid computing can be used for computer animation rendering. We propose a framework for Grid rendering services, describe its implementation, and present the results and statistics. A loseless 3D compression algorithm was also devised to solve the existing problem of transferring gigabytes of scene representation files (Renderman (.rib) and mental images (.mi)). This compression algorithm has been filed for patent in Singapore.
Visualization techniques of all sorts suffer from visual cluttering, the occlusion of visual information due to the overlap of graphical items;and from excessive complexity in analytical tasks due to multiple parallel...
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ISBN:
(纸本)9781450316569
Visualization techniques of all sorts suffer from visual cluttering, the occlusion of visual information due to the overlap of graphical items;and from excessive complexity in analytical tasks due to multiple parallel perspectives. To cope with these problems, we introduce Hierarchical Visual Filtering, a novel interaction principle based on pragmatic and epistemic actions. Pragmatic actions here mean that the analyst is able to visually select and filter information, determining visual configurations that reveal different perspectives;epistemic actions mean that the analyst can record, annotate, and recall intermediate visualizations created pragmatically. To do so, we use a tree-like organization to keep multiple visualization workspaces linked according to the analytical decisions took by the user. Our goal is to promote an innovative systematization that can augment the potential for database visual inspection, and for visualization systems in general. It is our contention that Hierarchical Visual Filtering can inspire a novel scheme of visualization environments in which space limitations and complexity are treated by means of interactive tasks. Copyright 2013 acm.
As newer and more sophisticated imagery collection systems rapidly increase the volume of imagery requiring thorough exploitation, the need for imagery analysts to acquire and maintain expertise increases accordingly....
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Scenarios are extensively used in software architecture evaluation. These scenarios are elicited from stakeholders using either a topdown or bottom-up approach. The former approach uses categorization schemes to focus...
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ISBN:
(纸本)1595932186
Scenarios are extensively used in software architecture evaluation. These scenarios are elicited from stakeholders using either a topdown or bottom-up approach. The former approach uses categorization schemes to focus stakeholders on developing scenarios for each required category. The latter approach uses brainstorming without any explicit categories of scenarios. It is claimed that top-down approach can result in improved quality of scenarios. However, there has been no empirical evidence on the relative effectiveness of the scenario elicitation techniques. In this paper we report on a controlled experiment with 24 subjects (postgraduate and final year undergraduate students with industry experience) in an academic context with the goal to assess the relative effectiveness of the two scenario elicitation approaches. Two groups developed scenarios to characterize quality attributes: the treatment group was given software change categories, the control group was not. The outcome variable was the quality of the scenarios produced by each participant. The average quality score for individual scenario profiles in the treatment group was significantly greater than the control group. All participants using the change categories reported that the knowledge of change categories helped them develop better quality scenarios. Our results support the claim that the provision of domainspecific software change categories helps generate better quality scenarios. Copyright 2006 acm.
Videographers have developed an art of conveying events in video. Through choices made in cinematography, editing, and post-processing, effective video presentations can be created from events recorded with little or ...
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ISBN:
(纸本)9781581131987
Videographers have developed an art of conveying events in video. Through choices made in cinematography, editing, and post-processing, effective video presentations can be created from events recorded with little or no intrusion. In this paper, we explore systems that bring videography to situations where cost or time issues preclude application of the art. Our goal is to develop virtual videography, that is, systems that can help automate the process of creating an effective video presentation from given footage. In this paper, we discuss how virtual videography systems can be constructed by combining image-based rendering to synthetically generate shots with image understanding to help choose what should be shown to the viewer. To this, visual effects can be added to enhance the presentation, lessening the degradation caused by the medium.
As multimedia information becomes more mainstream, the need to go beyond the simple viewing of that information increases. In order the simple viewing of that information increases. In order to be a useful tool, multi...
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ISBN:
(纸本)0201877740
As multimedia information becomes more mainstream, the need to go beyond the simple viewing of that information increases. In order the simple viewing of that information increases. In order to be a useful tool, multimedia data needs to be annotated and stored so that it can be queried like other information. Specifically, a general data management model is required that provides content-based annotation and retrieval of multimedia data.
AS Encryption / Decryption algorithm depends on the use of linear feedback shift registers (LFSR) in order to generate the key-stream bits. The A5-1 algorithm uses three different LFSRs with a majority function to add...
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ISBN:
(纸本)3905673207
AS Encryption / Decryption algorithm depends on the use of linear feedback shift registers (LFSR) in order to generate the key-stream bits. The A5-1 algorithm uses three different LFSRs with a majority function to add non-linearity, while A5-2 uses four LFSRs. In this paper a new multi-configurable LFSR design variant of the A5 algorithm is proposed, in which the inverse taps of the LFSR are used to generate the output key-stream bits. The new LFSR design, called a Complex LFSR, techniques can be effectively applied in software or hardware to a communications stream to provide a low cost and high speed encryption capability.
interactive data visualization is inherently an iterative trial-and-error process searching for an ideal set of parameters for classifying and rendering features of interest in the data. This paper presents 3-d region...
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ISBN:
(纸本)0769520286
interactive data visualization is inherently an iterative trial-and-error process searching for an ideal set of parameters for classifying and rendering features of interest in the data. This paper presents 3-d region growing based techniques that can assist the users to locate and define features of interest in volume data more quickly and more accurately. One technique employs partial region growing to generate a 2-d transfer function that effectively reveals the full features of interest. The other technique uses the result of full region growing to systematically construct a boundary surface for the extracted features. The resulting polygonal representation of the boundary surface can facilitate comparison, measurement, and simulation. A visual assessment method is suggested by using the extracted volume and surface information. These techniques either shorten or completely eliminate the typical trial-and-error step in the process of interactive data exploration.
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