Elimination of artifacts due to occlusion and discretization problems in image space blurring techniques

Barsky, Brian A.; Tobias, Michael J.; Chu, Derrick P.; Horn, Daniel Reiter

doi:10.1016/j.gmod.2005.01.009

Cited by 19 publications

(28 citation statements)

References 15 publications

(16 reference statements)

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“…[Kraus and Strengert 2007;Barsky et al 2005]gave solutions to partially solve this problem, which is to interpolate the occluded pixels by their neighbors. But they cannot get the real occluded pixels, and the results are incorrect, apparently when the radius of blurring is large and the occluded pixels are in-focus.…”

Section: Previous Workmentioning

confidence: 99%

“…But many such methods suffer some artifacts, for instance intensity leakage and partial occlusion. Intensity leakage happens when simply blurring the background with pixels in focus, while partial occlusion is caused by the fact that a lens with a finite aperture allows more of the scene to be visible than would be seen through an infinitesimal pinhole [Barsky et al 2005]. …”

Section: Introductionmentioning

confidence: 99%

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Layered depth-of-field rendering using color spreading

Sheng

et al. 2013

Proceedings of the 12th ACM SIGGRAPH International Conference on Virtual-Reality Continuum and Its Applications in Industry

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Figure 1: Depth of field effects. Image on the left is the original scene, the middle one is DoF effect focusing on foreground, and the right one is focusing on background. AbstractDepth of field (DoF) is a depth range outside of which objects are blurred. DoF has been widely used in photography and films by artists and is expected to be applied to realistic image rendering and virtual reality applications in the area of computer graphics. This paper presents a framework that produces DoF effect with high quality and performance. It is a layered method rendering the scene into layers where spreading filter is used to directly get the output ,reduce memory usage and improve the result comparing with other layered methods using gathering filter. Depth peeling is used to solve partial occlusion problem and modified to discard the insignificant occluded pixels so as to reduce the number of occluded layers. This framework can also eliminate artifacts such as intensity leakage and depth discontinuity, and is GPU-friendly.

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Section: Previous Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Layered depth-of-field rendering using color spreading

Sheng

et al. 2013

Proceedings of the 12th ACM SIGGRAPH International Conference on Virtual-Reality Continuum and Its Applications in Industry

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“…Such approaches work only for separate objects. Usually, discretization artifacts can only be mitigated with image processing [Barsky et al 2005], information duplication [Kraus and Strengert 2007], or depth variation [Lee et al 2008]. …”

Section: Dof Renderingmentioning

confidence: 99%

Real-time lens blur effects and focus control

Lee

Eisemann

Seidel

2010

TOG

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(b) (c) (d) (a)Figure 1: Example images rendered in real time by our method. We achieve near-accurate depth-of-field effects, including lens aberrations (e.g., spherical aberration, (a)). The efficiency of our method makes it well-suited for artistic purposes and we support complex simulations like tilt-shift photography (b). Further, our system offers an intuitive control of depth of field and we extend the physical model (c) to achieve an expressive, yet convincing result (d) (here, the background statues stay focused). AbstractWe present a novel rendering system for defocus blur and lens effects. It supports physically-based rendering and outperforms previous approaches by involving a novel GPU-based tracing method. Our solution achieves more precision than competing real-time solutions and our results are mostly indistinguishable from offline rendering. Our method is also more general and can integrate advanced simulations, such as simple geometric lens models enabling various lens aberration effects. These latter is crucial for realism, but are often employed in artistic contexts, too. We show that available artistic lenses can be simulated by our method. In this spirit, our work introduces an intuitive control over depth-of-field effects. The physical basis is crucial as a starting point to enable new artistic renderings based on a generalized focal surface to emphasize particular elements in the scene while retaining a realistic look. Our real-time solution provides realistic, as well as plausible expressive results.

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“…Although the alpha blending approximates visibility well for separated objects, discretization artifacts [Barsky et al 2005] can appear when objects are spread across multiple layers. A few methods mitigated this problem using special image processing [Barsky et al 2005], information duplication [Kraus and Strengert 2007], and depth variation [Lee et al 2008], but the use of layers still remains difficult.…”

Section: Previous Workmentioning

confidence: 99%

Depth-of-field rendering with multiview synthesis

Lee

Eisemann

Seidel

2009

ACM SIGGRAPH Asia 2009 Papers

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Figure 1: Our method achieves DOF blur effects comparable to accurate solutions in real time and avoids postprocessing artifacts. AbstractWe present a GPU-based real-time rendering method that simulates high-quality depth-of-field effects, similar in quality to multiview accumulation methods. Most real-time approaches have difficulties to obtain good approximations of visibility and view-dependent shading due to the use of a single view image. Our method also avoids the multiple rendering of a scene, but can approximate different views by relying on a layered image-based scene representation. We present several performance and quality improvements, such as early culling, approximate cone tracing, and jittered sampling. Our method achieves artifact-free results for complex scenes and reasonable depth-of-field blur in real time.

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Elimination of artifacts due to occlusion and discretization problems in image space blurring techniques

Cited by 19 publications

References 15 publications

Layered depth-of-field rendering using color spreading

Layered depth-of-field rendering using color spreading

Real-time lens blur effects and focus control

Depth-of-field rendering with multiview synthesis

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