Distortion viewing techniques for 3-dimensional data

Sheelagh, M.; Carpendale, T.; Cowperthwaite, David J.; Fracchia, F. David

doi:10.1109/infvis.1996.559215

Cited by 16 publications

(6 citation statements)

References 10 publications

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“…They can recognize the application they are embedded into, critical stages within the workflow, uncertain user behavior calling for help, or occlusion conditions when visualizing dynamic information. Although most of the visualization techniques used in our demo have been previously presented individually by others [7][9] [24][50] [51], their use and combination with the augmentation of physical objects and autonomous agents is novel.…”

Section: Agent Representationmentioning

confidence: 99%

Ubiquitous animated agents for augmented reality

Barakonyi

Schmalstieg

2006

2006 IEEE/ACM International Symposium on Mixed and Augmented Reality

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A growing spectrum of Ubiquitous Computing (UbiComp) applications suggests that interaction with computers should be as natural and effortless as using pen, paper and language when writing. Unlike current computer environments that require a considerable amount of adaptation from users for smooth interaction, future digital interfaces are envisioned to act unobtrusively and intelligently in our environment. This dissertation describes a novel user interface approach combining Augmented Reality (AR), UbiComp and Autonomous Animated Agents into a single coherent human-computer interface paradigm that makes steps toward this vision. A significant challenge for the UbiComp community is to create efficient, natural and user-friendly interfaces since there are no standards and best practices to follow yet. Typical UbiComp scenarios include numerous mobile users roaming a large area while interacting with various stationary and mobile devices. Since the location and behavior of users and devices change rather frequently, an enormous amount of events describing changes gets generated in the environment. Processing such large data sets can be greatly overwhelming for humans, therefore an interface to a UbiComp system is expected to possess certain autonomy in order to filter and interpret relevant events and react proactively without constant user guidance and explicit instructions. By relieving users from dealing with low-level details and allowing computers to make decisions by themselves, these interfaces appear to be "smart". This thesis presents software solutions that employ reactive, autonomous and social digital assistants in UbiComp environments. These systems rely on software agent technology tailored to the needs of AR applications, where system behavior is visualized by virtual animated characters appearing on top of the real world. We discuss how autonomous animated agents can be employed to mediate communication between humans and computers in AR environments while exploiting real world attributes as input and output communication channels. The agents maintain a model of the real world by analyzing data coming from the sensors that measure physical properties such as pose, velocity, sound or light, and autonomously react to changes in the environment in accordance with the users' perception. Autonomous, emergent behavior is a novel feature in UbiComp, while awareness of real world attributes is yet unexploited by autonomous agents. This dissertation explores the requirements for context-aware animated agents concerning visualization, appearance, and behavior as well as associated technologies, application areas, and implementation details. Several application scenarios illustrate design and implementation concepts. i Kurzfassung Ubiquitous Computing (UbiComp, ubiquitäre Computertechnik) zielt darauf ab, daß die Interaktion mit Computers so natürlich und mühelos sein soll wie das Schreiben mit einem Stift auf Papier. Im Gegensatz zu derzeitigen Computersystemen, die dem Benutzer Anpassung abverlangen, agieren...

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Section: Agent Representationmentioning

confidence: 99%

Ubiquitous animated agents for augmented reality

Barakonyi

Schmalstieg

2006

2006 IEEE/ACM International Symposium on Mixed and Augmented Reality

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“…Carpendale et al 7 give an example of view-dependent distortion visualization used in 3D data. Importance-driven feature enhancement 8 is another way to emphasize the important features based on the viewpoint to cut away occluding objects or render the less important objects sparsely.…”

Section: Related Workmentioning

confidence: 99%

Slice cutting and partial exposing techniques for three-dimensional texture-based volume rendering

Amin

Ryken

2006

SPIE Proceedings

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Three-dimensional texture-based volume rendering is a technique that treats a 3D volume as a 3D texture, renders multiple 2D view-oriented slices and blends them into the frame buffers. This technique is thoroughly developed in computer graphics and medical visualization, and widely accepted due to the advancement of computer hardware. This research aims at developing fast parallel slice cutting and partial exposing algorithms used in real-time 3D-texture-based volume rendering for image-guided surgery and therapy planning. In texture-based volume rendering, a large amount of slices are needed to render the volume to achieve high quality image, but for real-time interactive volume rendering, the computation time is critical. Instead of repeating the cutting algorithms for each slice against the volume data as conventional cutting algorithms do, the slice cutting algorithm developed in this paper applies the cutting only to the initial slice, and gets the slice vertexes and 3D texture coordinates for all the others based on the distance between the current slice and the initial slice. The new algorithm dramatically reduces the computation time for slice cutting, and eases the generation of sectional view for a volume. Partial exposing is another useful technique used in volume visualization to reveal important but hidden information. Two depth-based partial exposing algorithms are developed and implemented in this paper. Both partial exposing techniques can work with arbitrary complex, but convex, shapes of cutaway object, and their implementations maintain the interactive frame rate for 3D texture-based volume rendering without apparent performance decline compared to non-cutaway rendering.

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“…Alternatively, the position of the objects may be augmented to facilitate the understanding of the data. For example, Sheelagh et al 9 use this technique to provide a`clear line of sight' to obscured an concealed sections of the data. The abstract views may allow objects that are normally occluded to be seen, or generate a structural view of the whole data.…”

Section: The Conceptsmentioning

confidence: 99%