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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.  ...  The main contribution of this article is introducing interpolation bilaterally of image-based shadows.  ...  The filtered image g(p) deals with the effects of the bilateral filter on the multiple image-based shadow.  ... 
doi:10.1007/s11042-016-3254-0 fatcat:yiq727mjn5ci7axhowet3fz2xa

Efficient Screen Space Anisotropic Blurred Soft Shadows

Zhongxiang ZHENG, Suguru SAITO
2014 IEICE transactions on information and systems  
Soft shadowing based on shadow mapping is a blurring technique on a shadow map or on screen space.  ...  In this paper, we introduce a new screen space based method for soft shadowing that is fast and generates soft shadows more accurately than the previous screen space soft shadow mapping method.  ...  This algorithm achieves high quality soft shadows, but it also needs to store approximations calculated by pre-filtering. Back-projection methods [16] , [17] are also image based methods.  ... 
doi:10.1587/transinf.e97.d.2038 fatcat:caepzmi3krb7vgxdqnwycocrby

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  ...  Ali et al, [24] proposed SBFS method that based on bilateral filtering to generate soft shadow maps using multiple image-based algorithms.  ...  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

A review on dark channel prior based image dehazing algorithms

Sungmin Lee, Seokmin Yun, Ju-Hun Nam, Chee Sun Won, Seung-Won Jung
2016 EURASIP Journal on Image and Video Processing  
dehazing algorithms.  ...  Based on the DCP, the dehazing is accomplished through four major steps: atmospheric light estimation, transmission map estimation, transmission map refinement, and image reconstruction.  ...  To this end, the original DCP-based dehazing algorithm [10] adopted the soft matting to refine the transmission map.  ... 
doi:10.1186/s13640-016-0104-y fatcat:uxfnvbgtyffulgl3a6vxreud64

User-assisted image shadow removal

Han Gong, Darren Cosker
2017 Image and Vision Computing  
Texture noise in samples is then removed by applying local group bilateral filtering, and initial sparse shadow scales are estimated by fitting a piecewise curve to intensity samples.  ...  This paper presents a novel user-aided method for texture-preserving shadow removal from single images requiring simple user input.  ...  Poor samples are filtered based on similarity of illumination change ( Fig. 1 (d) ) and de-noised using directional bilateral filtering ( Fig. 1 (e) ).  ... 
doi:10.1016/j.imavis.2017.04.001 fatcat:xthougbkjngu3gz2mvnryi4tgu

Probabilistic illumination-aware filtering for Monte Carlo rendering

Ian C. Doidge, Mark W. Jones
2013 The Visual Computer  
In this work we present a probabilistic image based noise removal and irradiance filtering framework that preserves this high frequency detail such as hard shadows and glossy reflections, and imposes no  ...  Noise removal for Monte Carlo global illumination rendering is a well known problem, and has seen significant attention from image-based filtering methods.  ...  Since the cross-bilateral filter is ignorant of shadow boundaries, it blurs across the image removing all Fig. 6 This scene contains multiple glossy materials and complex textures.  ... 
doi:10.1007/s00371-013-0807-3 fatcat:ltizae63kfcevjscphhyrk7kru

Edge-preserving multiscale image decomposition based on local extrema

Kartic Subr, Cyril Soler, Frédo Durand
2009 ACM Transactions on Graphics  
Building on the key observation that the spatial scale of oscillations are characterized by the density of local extrema, we develop an algorithm for decomposing images into multiple scales of superposed  ...  Inspired by techniques in empirical data analysis and morphological image analysis, we use the local extrema of the input image to extract information about oscillations: We define detail as oscillations  ...  (b) Using our smoothing algorithm, the pattern is extracted as detail because of its fine scale, while coarser soft shadow-and petal-boundaries are preserved.  ... 
doi:10.1145/1618452.1618493 fatcat:idvralgfbvblfnwrjsqmqlbfva

Edge-preserving multiscale image decomposition based on local extrema

Kartic Subr, Cyril Soler, Frédo Durand
2009 ACM SIGGRAPH Asia 2009 papers on - SIGGRAPH Asia '09  
Building on the key observation that the spatial scale of oscillations are characterized by the density of local extrema, we develop an algorithm for decomposing images into multiple scales of superposed  ...  Inspired by techniques in empirical data analysis and morphological image analysis, we use the local extrema of the input image to extract information about oscillations: We define detail as oscillations  ...  (b) Using our smoothing algorithm, the pattern is extracted as detail because of its fine scale, while coarser soft shadow-and petal-boundaries are preserved.  ... 
doi:10.1145/1661412.1618493 fatcat:4bua2lnqubepbacxzlofxqyfea

Illustration of complex real-world objects using images with normals

Corey Toler-Franklin, Adam Finkelstein, Szymon Rusinkiewicz
2007 Proceedings of the 5th international symposium on Non-photorealistic animation and rendering - NPAR '07  
Our pipeline, based on acquired images with per-pixel normals, produces such illustrations easily and with high fidelity; it would be difficult to generate equivalent results starting with either a single  ...  2D image or a 3D scan.  ...  In addition, we filter the image as a preprocess (using the bilateral filter) in order to remove artifacts due to noise.  ... 
doi:10.1145/1274871.1274889 dblp:conf/npar/Toler-FranklinFR07 fatcat:stq4mjge3bgy3g67vpefkj6udm

Recent Advances in Adaptive Sampling and Reconstruction for Monte Carlo Rendering

M. Zwicker, W. Jarosz, J. Lehtinen, B. Moon, R. Ramamoorthi, F. Rousselle, P. Sen, C. Soler, S.-E. Yoon
2015 Computer graphics forum (Print)  
Monte Carlo integration is firmly established as the basis for most practical realistic image synthesis algorithms because of its flexibility and generality.  ...  Adaptive sampling and reconstruction algorithms reduce variance by controlling the sampling density and aggregating samples in a reconstruction step, possibly over large image regions.  ...  Instead, they propose a method suitable for real-time rendering of soft shadows based on axisaligned 2D filtering in image space as shown in Figure 3 , and without additional storage requirements.  ... 
doi:10.1111/cgf.12592 fatcat:yejby37itfeg5mzo4w5adtnjxa

Visibility Restoration Algorithm using Bilateral Filtering

Seles Xavier, Reshmi R.
2016 International Journal of Computer Applications  
A bilateral filtering is proposed so as to improve the time consumption of the algorithm by replacing the soft matting technique.  ...  This work proposes a visibility restoration algorithm for images taken during sandstorm conditions.  ...  CONCLUSION The work proposes a visibility restoration algorithm using bilateral filtering for the sandstorm images.  ... 
doi:10.5120/ijca2016911683 fatcat:lyrah37pajflbdsp5oyiowo6a4

Ray Traced Shadows: Maintaining Real-Time Frame Rates [chapter]

Jakub Boksansky, Michael Wimmer, Jiri Bittner
2019 Ray Tracing Gems  
Efficient and accurate shadow computation is a long-standing problem in computer graphics. In real-time applications, shadows have traditionally been computed using the rasterization-based pipeline.  ...  Therefore, the computation should focus on image regions where shadows actually appear, in particular on the shadow boundaries.  ...  Several algorithms for soft shadows are based on shadow mapping, most notably percentage closer soft shadows [9] .  ... 
doi:10.1007/978-1-4842-4427-2_13 fatcat:bmr6idd725a6piqgxx6jt3fnqa

Single Image Haze Removal using Contextual Regularization

2020 VOLUME-8 ISSUE-10, AUGUST 2019, REGULAR ISSUE  
A contextual regularization de-hazing algorithm is proposed which uses a single frame image for enhancing the foggy image using multilevel transmission mapping.  ...  Polarization based method is based on multiple image haze removal. Multiple images are captured using multiple polarization filters. These filters are attached to the camera.  ...  Mamtha An improved method based on Dark prior channel and Histogram implements soft matting with the help of bilateral filter.  ... 
doi:10.35940/ijitee.d1926.029420 fatcat:qiglcjkmt5hzvjbq44pkdmy4q4

A gentle introduction to bilateral filtering and its applications

Sylvain Paris
2007 ACM SIGGRAPH 2007 courses on - SIGGRAPH '07  
Georg would like to thank his parents for maintaining Castle Pyrmont, which provided a beautiful setting for many of the images in the paper.  ...  Acknowledgement We are thankful to the authors who gave us the permission to use their results to illustrate these course notes.  ...  However, we only use a twoscale decomposition, where the "base" image is computed using bilateral filtering, and the detail layer is the division of the input intensity by the base layer.  ... 
doi:10.1145/1281500.1281604 dblp:conf/siggraph/Paris07 fatcat:7hiertzncbe6hptgvrtvwvd3xi

A gentle introduction to bilateral filtering and its applications

Sylvain Paris, Pierre Kornprobst, Jack Tumblin, Frédo Durand
2008 ACM SIGGRAPH 2008 classes on - SIGGRAPH '08  
Georg would like to thank his parents for maintaining Castle Pyrmont, which provided a beautiful setting for many of the images in the paper.  ...  Acknowledgement We are thankful to the authors who gave us the permission to use their results to illustrate these course notes.  ...  However, we only use a twoscale decomposition, where the "base" image is computed using bilateral filtering, and the detail layer is the division of the input intensity by the base layer.  ... 
doi:10.1145/1401132.1401134 dblp:conf/siggraph/ParisKTD08 fatcat:czf26lysxzadvhr2vtgltfozxu
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