Non-Linear Perspective Projections

Inakage, Masa

doi:10.1007/978-4-431-68147-2_13

Cited by 12 publications

(4 citation statements)

References 5 publications

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“…The model is very general and allows even to specify non-orthogonal ray directions for each point. Similary, the models of Yonggao et al [31] and Levene [20] which generalizes a set of non-standard projections proposed earlier by Inakage [16] allow for non-planar projection surfaces. While Yonggao et al show how their projection can be extended with 3D lenses, Levene's model can combine multiple projections into a single image.…”

Section: Non Standard Camerasmentioning

confidence: 71%

Effective Visualization of Short Routes

Degener¹,

Schnabel²,

Schwartz³

et al. 2008

IEEE Trans. Visual. Comput. Graphics

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Abstract-In this work we develop a new alternative to conventional maps for visualization of relatively short paths as they are frequently encountered in hotels, resorts or museums. Our approach is based on a warped rendering of a 3D model of the environment such that the visualized path appears to be straight even though it may contain several junctions. This has the advantage that the beholder of the image gains a realistic impression of the surroundings along the way which makes it easy to retrace the route in practice. We give an intuitive method for generation of such images and present results from user studies undertaken to evaluate the benefit of the warped images for orientation in unknown environments.

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Section: Non Standard Camerasmentioning

confidence: 71%

Effective Visualization of Short Routes

Degener¹,

Schnabel²,

Schwartz³

et al. 2008

IEEE Trans. Visual. Comput. Graphics

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“…Interactive object deformation, like most modeling and animation tasks, usually requires camera manipulation as a secondary operation. View dependent distortions to scene geometry for animation and illustration have also been explored [16,20,22,25]. Agrawala et al…”

Section: Non-linear Projectionsmentioning

confidence: 99%

Visualizing 3D scenes using non-linear projections and data mining of previous camera movements

Singh

Balakrishnan

2004

Proceedings of the 3rd International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa

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We describe techniques for exploring 3D scenes by combining non-linear projections with the interactive data mining of camera navigations from previous explorations. Our approach is motivated by two key observations: First, that there is a wealth of information in prior explorations of a scene that can assist in future presentations of the same scene. Second, current linear perspective camera models produce images that are too limited to adequately capture the complexity of many 3D scenes. The contributions of this paper are two-fold. First, we show how spatial and temporal subdivision schemes can be used to store camera navigation information that is data mined and clustered to be interactively applicable to a number of existing techniques. Second, we show how the movement of a traditional linear perspective camera is closely tied to non-linear projections that combine space and time. As a result, we present a coherent system where the navigation of a conventional camera is data mined to provide both the understandability of linear perspective and the flexibility of non-linear projection of a 3D scene in realtime. Our system's generality is illustrated by three visualization techniques built with a single data mining and projection infrastructure.

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“…Levene's non-realistic projections [1998] extends Inakage's [1991] non-linear perspective projections and provides the capability to create a variety of artistic projections. This framework uses several parameterized functions that allow users to control the shape of the projection surfaces and the shape of convergence and divergence of orthogonals.…”

Section: Single Camera Projectionsmentioning

confidence: 99%

Single camera flexible projection

Brosz

Samavati

Carpendale

et al. 2007

Proceedings of the 5th International Symposium on Non-Photorealistic Animation and Rendering

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We introduce a flexible projection framework that is capable of modeling a wide variety of linear, nonlinear, and hand-tailored artistic projections with a single camera. This framework introduces a unified geometry for all of these types of projections using the concept of a flexible viewing volume. With a parametric representation of the viewing volume, we obtain the ability to create curvy volumes, curvy near and far clipping surfaces, and curvy projectors. Through a description of the framework's geometry, we illustrate its capabilities to recreate existing projections and reveal new projection variations. Further, we apply two techniques for rendering the framework's projections: ray casting, and a limited GPU based scanline algorithm that achieves real-time results.

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Non-Linear Perspective Projections

Cited by 12 publications

References 5 publications

Effective Visualization of Short Routes

Effective Visualization of Short Routes

Visualizing 3D scenes using non-linear projections and data mining of previous camera movements

Single camera flexible projection

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