3D unsharp masking for scene coherent enhancement

Ritschel, Tobias; Smith, Kaleigh; Ihrke, Matthias; Grosch, Thorsten; Myszkowski, Karol; Seidel, Hans‐Peter

doi:10.1145/1360612.1360689

Cited by 48 publications

(31 citation statements)

References 17 publications

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“…Ritschel et al [22] tried to extend variation from the normal to the lighting. Their unsharp masking technique increased the contrast of reflected radiance in 3D scenes, which enhanced the depiction of various visual cues.…”

Section: Related Workmentioning

confidence: 99%

Geometry-based shading for shape depiction enhancement

Al-Rousan

Sunar

Kolivand

2017

Multimed Tools Appl

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Recent works on Non-Photorealistic Rendering (NPR) show that object shape enhancement requires sophisticated effects such as: surface details detection and stylized shading. To date, some rendering techniques have been proposed to overcome this issue, but most of which are limited to correlate shape enhancement functionalities to surface feature variations. Therefore, this problem still persists especially in NPR. This paper is an attempt to address this problem by presenting a new approach for enhancing shape depiction of 3D objects in NPR. We first introduce a tweakable shape descriptor that offers versatile functionalities for describing the salient features of 3D objects. Then to enhance the classical shading models, we propose a new technique called Geometry-based Shading. This technique controls reflected lighting intensities based on local geometry. Our approach works without any constraint on the choice of material or illumination. We demonstrate results obtained with Blinn-Phong shading, Gooch shading, and cartoon shading. These results prove that our approach produces more satisfying results compared with the results of previous shape depiction techniques. Finally, our approach runs on modern graphics hardware in real time, which works efficiently with interactive 3D visualization.

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Section: Related Workmentioning

confidence: 99%

Geometry-based shading for shape depiction enhancement

Al-Rousan

Sunar

Kolivand

2017

Multimed Tools Appl

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“…Some approaches combine perceptually-based and ophthalmologically-based techniques for improving image viewing (e.g., [Peli and Woods 2009]) and for improving resolution in videos and animations (e.g., [Didyk et al 2010;Berthouzoz and Fattal 2012a;Berthouzoz and Fattal 2012b;Templin et al 2013;Stengel et al 2013]). For instance, the Cornsweet illusion has been exploited to provide enhanced local contrast [Ritschel et al 2008] and to provide a perceptually-based metric for achieving compelling and efficient stereo disparity [Didyk et al 2011]. Metrics have also been designed to quantify human sensitivity to blur (e.g., [Karunasekera and Kingsbury 1994;Marziliano et al 2002;Marziliano et al 2004]).…”

Section: Perceptual and Rendering Approachesmentioning

confidence: 99%

A Total Variation Approach for Customizing Imagery to Improve Visual Acuity

et al. 2015

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We describe a technique to generate imagery with improved sharpness for individuals having refractive vision problems. Our method can reduce their dependence on corrective eyewear. It also benefits individuals with normal vision by improving visual acuity at a distance and of small details. Our approach does not require custom hardware. Instead, the calculated images can be shown on a standard computer display, on printed paper, or superimposed on a physical scene using a projector. Our technique uses a constrained total-variation method to produce a deconvolution result which upon observation appears sharp at the edges. We introduce a novel relative total variation term that enables controlling ringing reduction, contrast gain and sharpness. The end result is the ability to generate sharper appearing images, even for individuals with refractive vision problems including myopia, hyperopia, presbyopia, and astigmatism. Our approach has been validated in simulation, in camera-screen experiments, and in a study with human observers.

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“…[25][26][27][28] Our approach orthogonally works on depth cues and could be combined with such approaches.…”

Section: Previous Workmentioning

confidence: 99%

Apparent stereo: the Cornsweet illusion can enhance perceived depth

et al. 2012

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It is both a technical and an artistic challenge to depict three-dimensional content using stereo equipment and a flat two-dimensional screen. On the one hand, the content needs to fit within the limits of a given display technology and at the same time achieve a comfortable viewing experience. Given the technological advances of 3D equipment, especially the latter increases in importance. Modifications to stereo content become necessary that aim at flattening or even removing binocular disparity to adjust the 3D content to match the comfort zone in which the clash between accommodation and vergence stays acceptable. However, applying such modifications can lead to a reduction of crucial depth details. One promising direction is backwardcompatible stereo, for which the disparity is low enough that overlaid stereo pairs seem almost identical. It builds upon the Craik-O'Brien-Cornsweet effect, a visual illusion, which uses so-called Cornsweet profiles to produce a local contrast that leads to a perceived brightness increase. Similarly, Cornsweet profiles in disparity can lead to an illusion of depth. Applying them skilfully at depth discontinuities allows for a reduction of the overall disparity range to ensure a comfortable yet convincing stereo experience. The present work extends the previous idea by showing that Cornsweet profiles can also be used to enhance the 3D impression. This operation can help in regions where the disparity range was compressed, but also to emphasize parts of a scene. A user study measures the performance of backward-compatible stereo and our disparity enhancement.

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3D unsharp masking for scene coherent enhancement

Cited by 48 publications

References 17 publications

Geometry-based shading for shape depiction enhancement

Geometry-based shading for shape depiction enhancement

A Total Variation Approach for Customizing Imagery to Improve Visual Acuity

Apparent stereo: the Cornsweet illusion can enhance perceived depth

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