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Shadow Removal Using Bilateral Filtering
IEEE Transactions on Image Processing, 2012In this paper, we propose a simple but effective shadow removal method using a single input image. We first derive a 2-D intrinsic image from a single RGB camera image based solely on colors, particularly chromaticity. We next present a method to recover a 3-D intrinsic image based on bilateral filtering and the 2-D intrinsic image.
Qingxiong Yang +2 more
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Implementation of a Shadow Filter using CFCC
2021 2nd International Conference for Emerging Technology (INCET), 2021In this paper a new shadow filter implementation has been designed using Current Follower Current Conveyor (CFCC) block and grounded elements. Shadow filter allows for electronically tunable filter parameters by simply varying the gain of an external amplifier in the feedback path and without disturbing the core filter circuit.
Prakhar Prakash +3 more
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Filtering Multi‐Layer Shadow Maps for Accurate Soft Shadows
Computer Graphics Forum, 2014AbstractIn this paper, we introduce a novel technique for pre‐filtering multi‐layer shadow maps. The occluders in the scene are stored as variable‐length lists of fragments for each texel. We show how this representation can be filtered by progressively merging these lists.
Selgrad, K. +3 more
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New Voltage-Mode Bandpass Shadow Filter
2016 13th International Multi-Conference on Systems, Signals & Devices (SSD), 2016A new voltage-mode bandpass shadow filter is presented. The filter is built around the current-feedback operational-amplifier. The parameters of the filter can be controlled by adjusting the gains of external amplifiers built around the current-feedback operational-amplifier.
Muhammad Taher Abuelma'Atti
exaly +3 more sources
Bilateral Filtered Shadow Maps
2009We present a novel shadow smoothing algorithm using the bilateral filter. From the observation that shadow leaking, which is found often in filter based approaches, occurs at depth discontinuity seen from the viewpoint of the eye, we apply the bilateral filter which is conceptually a product of two Gaussian filters, one for smoothing the shadow map and
Jinwook Kim, Soojae Kim
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2002
In video sequence processing, shadow remains a major source of error of object segmentation. Traditional methods of shadow removal are mainly based on colour difference thresholding between the background and current images. The application of colour filters on MPEG or MJPEG images, however, is often erroneous as the chrominace information is ...
Benny P. L. Lo, Guang-Zhong Yang
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In video sequence processing, shadow remains a major source of error of object segmentation. Traditional methods of shadow removal are mainly based on colour difference thresholding between the background and current images. The application of colour filters on MPEG or MJPEG images, however, is often erroneous as the chrominace information is ...
Benny P. L. Lo, Guang-Zhong Yang
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‘Shadow’ Filters—A New Family of Electronically Tunable Filters
IETE Journal of Education, 2010It is shown that the ‘shadow’ filter, introduced recently by Lakys and Fabre, is capable of achieving not only a constant bandwidth bandpass filter, but also several other interesting characteristics depending upon the choice of the desired output port and the port from which feedback signal is derived.
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Practical hybrid pre-filtering shadow maps
Proceedings of The 7th ACM SIGGRAPH International Conference on Virtual-Reality Continuum and Its Applications in Industry, 2008Both exponential shadow maps and variance shadow maps are efficient shadow maps anti-aliasing algorithms based on pre-filtering, but exponential shadow maps will cause light bleeding, float over-flow and penumbra discontinuity problems and variance shadow maps also have serious light bleeding problem.
Weiwei Lv, Xuehui Liu, Enhua Wu
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Practical hybrid pre-filtering shadow maps
2009 11th IEEE International Conference on Computer-Aided Design and Computer Graphics, 2009Both exponential shadow maps and variance shadow maps are efficient shadow maps anti-aliasing algorithms based on pre-filtering, but exponential shadow maps will cause light bleeding, float overflow and penumbra discontinuity problems and variance shadow maps also have serious light bleeding problem.
Weiwei Lv, Xuehui Liu, Jian Lu, Enhua Wu
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Smooth shadow boundaries with exponentially warped Gaussian filtering
Computers & Graphics, 2013This work has been supported by the Spanish Ministry of Education and Science (TIN2010-21089-C03-01, TIN2010-21089-C03-03, TIN2009-14103-C03-01), Caja Castellem-Bancaja Foundation (P1.1B2010-08, P1.1B2009-34), the European Union (Ref. 226487), Generalitat Valenciana (Project PROMETEO/2010/028), BEST/2011/287, Generalitat of Catalunya (Catalan ...
Jesús Gumbau +4 more
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