Musings on volumetric level of detail for virtual environments

Reddy, Martin

doi:10.1007/bf02009713

Cited by 38 publications

(45 citation statements)

References 5 publications

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“…One of the first studies of this kind was that of Reddy [Red97], which analysed the frequency content in several pre-rendered images to determine for each model the best LOD to use in a real-time rendering system. Ferwerda et al…”

Section: Image-based Perceptual Metricsmentioning

confidence: 99%

Perceptual Metrics for Static and Dynamic Triangle Meshes

Corsini

Larabi

Lavoué

et al. 2013

Computer Graphics Forum

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Almost all mesh processing procedures cause some more or less visible changes in the appearance of objects represented by polygonal meshes. In many cases, such as mesh watermarking, simplification or lossy compression, the objective is to make the change in appearance negligible, or as small as possible, given some other constraints. Measuring the amount of distortion requires taking into account the final purpose of the data. In many applications, the final consumer of the data is a human observer, and therefore the perceptibility of the introduced appearance change by a human observer should be the criterion that is taken into account when designing and configuring the processing algorithms. In this review, we discuss the existing comparison metrics for static and dynamic (animated) triangle meshes. We describe the concepts used in perception-oriented metrics used for 2D image comparison, and we show how these concepts are employed in existing 3D mesh metrics. We describe the character of subjective data used for evaluation of mesh metrics and provide comparison results identifying the advantages and drawbacks of each method. Finally, we also discuss employing the perception-correlated metrics in perception-oriented mesh processing algorithms.

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Section: Image-based Perceptual Metricsmentioning

confidence: 99%

Perceptual Metrics for Static and Dynamic Triangle Meshes

Corsini

Larabi

Lavoué

et al. 2013

Computer Graphics Forum

View full text Add to dashboard Cite

show abstract

“…In order to create the correct view of the environment, some pointing device is needed to indicate the viewer's vantage point, and head tracking is one of the most commonly used devices. Thus, in order to save scene-rendering time, which can otherwise be quite extensive, multi-resolutional VR displays are commonly used (for a recent review, see Luebke et al, 2002), and these are most often head-contingent (e.g., Ohshima, Yamamoto, & Tamura, 1996;Reddy, 1997;Watson et al, 1997). Reddy (1997, p. 181) has, in fact, argued that head tracking is often all that is needed to provide substantial savings in multi-resolutional VR displays, and he showed that taking account of retinal eccentricity created very little savings in at least two different VR applications (Reddy, 1997;Reddy, 1998).…”

Section: Virtual Realitymentioning

confidence: 99%

Gaze-Contingent Multiresolutional Displays: An Integrative Review

et al. 2003

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Gaze-contingent multi-resolutional displays (GCMRDs) place high-resolution information only in the area to which the user's gaze is directed. This portion of the display is referred to as the area of interest (AOI). Image resolution and details outside the AOI are reduced, lowering the requirements for processing resources and transmission bandwidth in demanding display and imaging applications.This review provides an integrative survey of the current literature on GCMRDs across a wide range of applications. It also provides a general framework within which such research can be integrated, evaluated, and guided. Within this framework, a GCMRD (or "moving window") is analyzed in terms of (1) its multi-resolutional images (also called "variable-resolution", "space-variant", or "level of detail"), and (2) its gaze-contingent (or "foveated" or "eye-slaved"), movement of the AOI. We also synthesize the known human factors research on GCMRDs, and point out important questions for future research and development. Actual or potential applications of this research include flight, medical and driving simulators, virtual reality, remote piloting and teleoperation, infrared and indirect vision, image transmission and image retrieval, telemedicine, video teleconferencing, robotics and artificial vision systems.

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“…Reddy was the first to attempt an LOD selection system guided throughout by a principled perceptual model [24]. Using images rendered from multiple viewpoints, Reddy analyzed the frequency content of objects and their LODs, A model of the visual acuity, defined as highest perceptible spatial frequency, guided LOD selection: if a high-resolution and a low-resolution LOD differed only at frequencies beyond the visual acuity of the viewer, the system used the low-resolution LOD.…”

Section: Perceptually Based Lod Selectionmentioning

confidence: 99%

“…Like other perceptually driven rendering algorithms (e.g., [23][2]) we model perceptibility of static stimuli; we believe that the field as a whole needs to begin incorporating measures of temporal contrast sensitivity to address possible flicker artifacts in interactive or animated rendering. Finally, we would like to exploit the reduced visual acuity caused by velocity across the retinal field, which Reddy's work suggests provides a promising opportunity for further simplification [24].…”

Section: Ongoing and Future Workmentioning

confidence: 99%

Perceptually Driven Simplification for Interactive Rendering

2001

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We present a framework for accelerating interactive rendering, grounded in psychophysical models of visual perception. This framework is applicable to multiresolution rendering techniques that use a hierarchy of local simplification operations. Our method drives those local operations directly by perceptual metrics; the effect of each simplification on the final image is considered in terms of the contrast the operation will induce in the image and the spatial frequency of the resulting change. A simple and conservative perceptual model determines under what conditions the simplification operation will be perceptible, enabling imperceptible simplification in which operations are performed only when judged imperceptible. Alternatively, simplifications may be ordered according to their perceptibility, providing a principled approach to best-effort rendering. We demonstrate this framework applied to view-dependent polygonal simplification. Our approach addresses many interesting topics in the acceleration of interactive rendering, including imperceptible simplification, silhouette preservation, and gaze-directed rendering.

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Musings on volumetric level of detail for virtual environments

Cited by 38 publications

References 5 publications

Perceptual Metrics for Static and Dynamic Triangle Meshes

Perceptual Metrics for Static and Dynamic Triangle Meshes

Gaze-Contingent Multiresolutional Displays: An Integrative Review

Perceptually Driven Simplification for Interactive Rendering

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