Real-time ambient occlusion and halos with Summed Area Tables

Díaz, José A.; Vázquez, Pere‐Pau; Navazo, Isabel; Duguet, Florent

doi:10.1016/j.cag.2010.03.005

Cited by 39 publications

(31 citation statements)

References 16 publications

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“…Around the same time Diaz et al presented a similar technique [15]. They also utilize SATs and are able to achieve smooth-looking results with high performance.…”

Section: Statistical Approachesmentioning

confidence: 99%

“…Diaz et al [15] show how the halos can be benificial for identification purposes in, for example, medical applications. However, in most rendering scenarios that aim at achieving physically plausible results, the halos should be considered unwanted artifacts.…”

Section: Statistical Approachesmentioning

confidence: 99%

“…In this thesis, we build upon the previously discussed approaches and show how to remove such artifacts using adaptive depth layers. As shown by Diaz [15], SATs can be used to efficiently evaluate smooth AO without the usual noise artifacts. Halos caused by overestimation are clearly visible and are used to improve object identification.…”

Section: Statistical Approachesmentioning

confidence: 99%

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Adaptively layered statistical volumetric obscurance

Hendrickx

Scandolo

Eisemann

et al. 2015

Proceedings of the 7th Conference on High-Performance Graphics

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We accelerate volumetric obscurance, a variant of ambient occlusion, and solve undersampling artifacts, such as banding, noise or blurring, that screen-space techniques traditionally suffer from. We make use of an efficient statistical model to evaluate the occlusion factor in screen-space using a single sample. Overestimations and halos are reduced by an adaptive layering of the visible geometry. Bias at tilted surfaces is avoided by projecting and evaluating the volumetric obscurance in tangent space of each surface point. We compare our approach to several traditional screen-space volumetric obscurance techniques and show its competitive qualitative and quantitative performance. Our algorithm maps well to graphics hardware, does not require the traditional bilateral blur step of previous approaches, and avoids typical screen-space related artifacts such as temporal instability due to undersampling.iii PREFACE

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“…Around the same time Diaz et al presented a similar technique [15]. They also utilize SATs and are able to achieve smooth-looking results with high performance.…”

Section: Statistical Approachesmentioning

confidence: 99%

Section: Statistical Approachesmentioning

confidence: 99%

Section: Statistical Approachesmentioning

confidence: 99%

See 1 more Smart Citation

Adaptively layered statistical volumetric obscurance

Hendrickx

Scandolo

Eisemann

et al. 2015

Proceedings of the 7th Conference on High-Performance Graphics

View full text Add to dashboard Cite

show abstract

“…For example, GPU-based screen space ambient occlusion (SSAO) [Shanmugam and Arikan 2007] is a fast technique to render occlusion effects by sampling the depth buffer in screen space. It can be also applied to volume rendering [Díaz et al 2010]. Although efficient, SSAO may not produce desired results in certain cases where depth buffer cannot offer enough information such as topology and opacity.…”

Section: Related Workmentioning

confidence: 99%

Fast global illumination for interactive volume visualization

Zhang

2013

Proceedings of the ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games

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High quality global illumination can enhance the visual perception of depth cue and local thickness of volumetric data but it is seldom used in scientific visualization because of its high computational cost. This paper presents a novel grid-based illumination technique which is specially designed and optimized for volume visualization purpose. It supports common light sources and dynamic transfer function editing. Our method models light propagation, including both absorption and scattering, in a volume using a convectiondiffusion equation that can be solved numerically. The main advantage of such technique is that the light modeling and simulation can be separated, where we can use a unified partial-differential equation to model various illumination effects, and adopt highlyparallelized grid-based numerical schemes to solve it. Results show that our method can achieve high quality volume illumination with dynamic color and opacity mapping and various light sources in real-time. The added illumination effects can greatly enhance the visual perception of spatial structures of volume data.

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“…Since their original conception by Crow (1984), SAT were successfully employed on a wide range of tasks ranging from face and object recognition 1 [Viola & Jones (2004)], depth-of-field and glossy reflections [Hensley et al (2005)], shadows [Díaz et al (2010); Lauritzen (2007); Slomp et al (2010)] and tone-mapping [Slomp & Oliveira (2008)…”

Section: Review Of Summed-area Tables (Sat)mentioning

confidence: 99%