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Soft bilateral filtering shadows using multiple image-based algorithms

Hatam H. Ali, Hoshang Kolivand, Mohd Shahrizal Sunar
2016 Multimedia tools and applications  
Then penumbra region was used for interpolation based on bilateral filtering to create the soft shadows. They depend on multiple shadow maps which provide antialiasing shadow maps.  ...  This study introduces Soft Bilateral Filtering Shadows method of dynamic scenes, which uses multi-matrices of the light sample points due to lack realism in soft shadows generation in real time.  ...  In addition, this algorithm is time-consuming due to multi-rendering passes based on the size of the part semi-occluded. Cai et al. [5] proposed multi-layered shadow fins to render soft shadow.  ... 
doi:10.1007/s11042-016-3254-0 fatcat:yiq727mjn5ci7axhowet3fz2xa

Shadow Penumbras for Complex Objects by Depth-Dependent Filtering of Multi-Layer Depth Images [article]

Brett Keating, Nelson Max
1999 Symposium on Rendering  
This paper presents an efficient algorithm for filtering multi-layer depth images (MDIs) in order to produce approximate penumbras.  ...  The method's effectiveness is demonstrated on especially complex objects such as trees, whose soft shadows are expensive to compute by other methods.  ...  proposed layered depth images (LDIs), which are multi-layer depth images optimized for rendering speed [24] .  ... 
doi:10.2312/egwr/egwr99/197-212 fatcat:l54fydn4evhefd6o3bchhmk3by

Shadow Penumbras for Complex Objects by Depth-Dependent Filtering of Multi-Layer Depth Images [chapter]

Brett Keating, Nelson Max
1999 Eurographics  
This paper presents an efficient algorithm for filtering multi-layer depth images (MDIs) in order to produce approximate penumbras.  ...  The method's effectiveness is demonstrated on especially complex objects such as trees, whose soft shadows are expensive to compute by other methods.  ...  Shade et al. proposed layered depth images (LDIs), which are multi-layer depth images optimized for rendering speed [24] .  ... 
doi:10.1007/978-3-7091-6809-7_18 fatcat:xbsiwhzumjc3zohueggrmycxim

Survey of Shadow Volume Algorithms in Computer Graphics

Hoshang Kolivand, Mohd Shahrizal Sunar
2013 IETE Technical Review  
The main goal of this paper is to provide researchers with background on a variety of shadow mapping techniques so as make it easier for them to choose the method best suited to their aims.  ...  This study provides an overview of popular and famous algorithms and techniques in shadow maps generation.  ...  The authors are grateful to the anonymous referee for a careful checking of the details and for helpful comments that improved this paper.  ... 
doi:10.4103/0256-4602.107338 fatcat:t2ajipa6xfcqtepyefhphall5a

Soft Shadows by Ray Tracing Multilayer Transparent Shadow Maps [article]

Feng Xie, Eric Tabellion, Andrew Pearce
2007 Symposium on Rendering  
We present a method for high quality soft shadows for area lights in cinematic lighting.  ...  Instead of the traditional sampling and filtering of shadow maps, we compute the shadow factor by ray tracing the multilayer transparent shadow map.  ...  Then in 2000, Agrawala et al [ARHM00] introduced ray tracing of multi-view shadow maps for creating soft shadows from area lights.  ... 
doi:10.2312/egwr/egsr07/265-276 fatcat:3iqnu6jfizcg5c45qkhn2gpfu4

Robust Soft Shadow Mapping with Backprojection and Depth Peeling

Louis Bavoil, Steven P. Callahan, Cláudio T. Silva
2008 Journal of Graphics Tools  
Our algorithm uses a multi-layer shadow map to reduce light bleeding, and midpoint shadow maps to handle self-shadowing more robustly.  ...  Soft shadow mapping is an attractive solution to the problem of realtime soft shadows because it works with any kind of rasterizable geometry (in particular alpha-transparent textures and hair), it does  ...  We thank Sony Computer Entertainment America R&D for their support, and Gael Guennebaud for helpful conversations. Louis Bavoil, Steven P. Callahan, and Cláudio T.  ... 
doi:10.1080/2151237x.2008.10129254 fatcat:pyxoqphol5bzfnxcwtjok5sfom

Bitmask Soft Shadows

Michael Schwarz, Marc Stamminger
2007 Computer graphics forum (Print)  
Recently, several real-time soft shadow algorithms have been introduced which all compute a single shadow map and use its texels to obtain a discrete scene representation.  ...  In addition, a new interpretation of the shadow map data is suggested which often provides superior visual results.  ...  To better account for varying penumbra widths, Fernando [Fer05] employs the result of an occluder search in the shadow map to derive the kernel size for the filtering step.  ... 
doi:10.1111/j.1467-8659.2007.01074.x fatcat:jvuzzbj67zaazpz6wue5tzcuoi

Packet-based Hierarchal Soft Shadow Mapping

Baoguang Yang, Jieqing Feng, Gaël Guennebaud, Xinguo Liu
2009 Computer graphics forum (Print)  
Abstract Recent soft shadow mapping techniques based on back-projection can render high quality soft shadows in real time.  ...  Figure 1 : Some pictures rendered using our soft shadow mapping algorithm, at 16, 24, 30, 46 frames per second respectively, without any precomputation.  ...  At last, we presented and discuss multi-view shadow maps as a solution to the single shadow map artifacts. We showed its superior performance and antialiasing capability than multi-layer methods.  ... 
doi:10.1111/j.1467-8659.2009.01489.x fatcat:h7r6whe47vewxggkeygjoduzge

DeshadowNet: A Multi-context Embedding Deep Network for Shadow Removal

Liangqiong Qu, Jiandong Tian, Shengfeng He, Yandong Tang, Rynson W. H. Lau
2017 2017 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)  
These two complementary networks generate multi-context features to obtain the shadow matte with fine local details.  ...  DeshadowNet is designed with a multi-context architecture, where the output shadow matte is predicted by embedding information from three different perspectives.  ...  The deeper layers of G-Net are good at capturing high-level semantic context but poor for accurate localization due to the resulted coarse features.  ... 
doi:10.1109/cvpr.2017.248 dblp:conf/cvpr/QuTHTL17 fatcat:dpcey5jjvvfspjqe5df2noxowu

Effective shadow removal via multi-scale image decomposition

Ling Zhang, Qingan Yan, Yao Zhu, Xiaolong Zhang, Chunxia Xiao
2019 The Visual Computer  
Finally, we recover the texture details for the shadow-free basic layer and obtain the final shadow-free image.  ...  In this paper, we propose a novel shadow removal algorithm based on multi-scale image decomposition, which can recover the illumination for complex shadows with inconsistent illumination and different  ...  First, complex shadows are usually hard to be detected accurately, for example, the soft shadow with unconspicuous shadow boundary.  ... 
doi:10.1007/s00371-019-01685-8 fatcat:37gfcmxqcndhdeq6nzo2fehmea

LivePhantom: Retrieving Virtual World Light Data to Real Environments

Hoshang Kolivand, Mark Billinghurst, Mohd Shahrizal Sunar, Houbing Song
2016 PLoS ONE  
A Kinect camera was used to produce a depth map for the physical scene mixing into a single real-time transparent tacit surface.  ...  In this paper, we propose a new method for creating complex AR indoor scenes using real time depth detection to exert virtual shadows on virtual and real environments.  ...  Convolution Shadow Maps (CoSMs) [32] are one of the improved shadow algorithms utilized by Aittala [33] to generate AR soft shadows drawing upon both fast summed area tables and mip-map filtering  ... 
doi:10.1371/journal.pone.0166424 pmid:27930663 pmcid:PMC5145151 fatcat:b3vnobijlzfhzjze2uhduy6sca

Fast indirect illumination using Layered Depth Images

Matthias Nießner, Henry Schäfer, Marc Stamminger
2010 The Visual Computer  
Thus, we approximate secondary rays by intersecting them with precomputed layered depth images of the scene.  ...  We observe that it is more important to cast many rays than to have precise results for each ray.  ...  Acknowledgements We would like the thank Marko Dabrovic for the Sponza and Sibenik model, Frank Meinl for the enhancements on Sponza, the Stanford Computer Graphics Laboratory for the Buddha and Lucy model  ... 
doi:10.1007/s00371-010-0486-2 fatcat:ddadercqdfgrdkwsjvz2mcv5qq

Soft bilateral filtering volumetric shadows using cube shadow maps

Hatam H. Ali, Mohd Shahrizal Sunar, Hoshang Kolivand, Yudong Zhang
2017 PLoS ONE  
Soft bilateral filtering volumetric shadows using cube shadow maps http://researchonline.ljmu.ac.uk/8066/ Article LJMU has developed LJMU Research Online for users to access the research output of the  ...  We have proposed an accurate solution to the general soft volumetric shadows sampling problem.  ...  sample with bilateral filtering. https://doi.org/10.1371/journal.pone.0178415.g009 Soft bilateral filtering volumetric shadows using cube shadow maps generating soft volumetric shadows with bilateral  ... 
doi:10.1371/journal.pone.0178415 pmid:28632740 pmcid:PMC5478108 fatcat:2pxzfyinqbbtrkapadigaqnlwi

Weakly Supervised Estimation of Shadow Confidence Maps in Fetal Ultrasound Imaging [article]

Qingjie Meng, Matthew Sinclair, Veronika Zimmer, Benjamin Hou, Martin Rajchl, Nicolas Toussaint, Ozan Oktay, Jo Schlemper, Alberto Gomez, James Housden, Jacqueline Matthew, Daniel Rueckert (+2 others)
2019 arXiv   pre-print
In this paper we propose a weakly supervised method for automatic confidence estimation of acoustic shadow regions. Our method is able to generate a dense shadow-focused confidence map.  ...  We further demonstrate the applicability of our method by integrating shadow confidence maps into tasks such as ultrasound image classification, multi-view image fusion and automated biometric measurements  ...  ACKNOWLEDGMENT We thank the volunteers, sonographers and experts for providing manually annotated datasets and NVIDIA for their GPU donations. This work was supported by the Wellcome Trust IEH Award  ... 
arXiv:1811.08164v3 fatcat:qbjll5azfbfsbgvud7sjrmzzli

Efficient Rendering of Human Skin [article]

Eugene D'Eon, David Luebke, Eric Enderton
2007 Symposium on Rendering  
and translucent shadow maps.  ...  Existing offline techniques for modeling subsurface scattering effects in multi-layered translucent materials such as human skin achieve remarkable realism, but require seconds or minutes to generate an  ...  Acknowledgements Many thanks to XYZRGB, for providing two high resolution head scans, and to Paul Debevec and his team [MHP * 07] for providing the face capture datasets(Figure 9 ).  ... 
doi:10.2312/egwr/egsr07/147-157 fatcat:pa6d4bbajnd7jglov6ln2bhnmu
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