Results 281 to 290 of about 131,912 (319)

Shadow map filtering with Gaussian shadow maps

Proceedings of the 10th International Conference on Virtual Reality Continuum and Its Applications in Industry, 2011
Shadow mapping is a technique, widely used in computer graphics, for efficiently calculating shadows in real-time applications. However, shadows created with this technique can not be filtered as regular textures, causing severe aliasing. To solve this problem, several techniques based on statistical analysis, including variance shadow maps and ...
Jesús Gumbau, Mateu Sbert, László Szirmay-Kalos, Miguel Chover, Carlos González   +4 more
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Shadow Removal Using Bilateral Filtering

IEEE Transactions on Image Processing, 2012
In 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, Kar-Han Tan, Narendra Ahuja   +2 more
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Filtering Multi‐Layer Shadow Maps for Accurate Soft Shadows

Computer Graphics Forum, 2014
AbstractIn 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., Dachsbacher, C., Meyer, Q., Stamminger, M.   +3 more
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OTRA based shadow filters

2015 Annual IEEE India Conference (INDICON), 2015
This paper presents shadow filter configuration implemented using operational transresistance amplifier (OTRA). In shadow filters an external amplifier is added in the feed back loop of the basic filter and by controlling the gain of this amplifier the characteristics of the resulting filter can be tuned.
Rashika Anurag, Rajeshwari Pandey, Neeta Pandey, Mandeep Singh, Manish Jain   +4 more
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Bilateral Filtered Shadow Maps

2009
We 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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Neuro-Fuzzy Shadow Filter

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
openaire   +1 more source

‘Shadow’ Filters—A New Family of Electronically Tunable Filters

IETE Journal of Education, 2010
It 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, 2008
Both 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, 2009
Both 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
openaire   +1 more source

Shadow Bandpass Filter with Q-improvement

2019 5th International Conference on Engineering, Applied Sciences and Technology (ICEAST), 2019
A new architecture of the shadow bandpass filters with the quality factor improvement is proposed. The presented idea employs external amplifiers cooperating with the classical biquad cell resulting in convenient electronic tunability of the characteristic frequency and the quality factor.
Seangrawee Buakaew, Wipavan Narksarp, Chariya Wongtaychatham   +2 more
openaire   +1 more source