Results 221 to 230 of about 13,177 (257)
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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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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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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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Efficient shadow map filtering
2008Schatten liefern dem menschlichen Auge wichtige Informationen, um die räumlichen Beziehungen in der Umgebung in der wir leben wahrzunehmen. Sie sind somit ein unverzichtbarer Bestandteil der realistischen Bildsynthese. Leider ist die Sichtbarkeitsberechnung ein rechenintensiver Prozess.
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Shadow Bandpass Filter with Q-improvement
2019 5th International Conference on Engineering, Applied Sciences and Technology (ICEAST), 2019A 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 +2 more
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Noise Reduction of Chaotic Systems by Kalman Filtering and by Shadowing
International Journal of Bifurcation and Chaos, 1997We investigate two techniques for filtering signals from noisy nonlinear systems. Both the dynamics and the observed signals may be subject to noise. The first technique is a modified Kalman filter which accounts for the noise-amplification properties of chaotic systems and has less tendency to diverge than the usual Kalman filter.
Walker, David M., Mees, Alistair I.
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Filtered Stochastic Shadow Mapping Using a Layered Approach
Computer Graphics Forum, 2015AbstractGiven a stochastic shadow map rendered with motion blur, our goal is to render an image from the eye with motion‐blurred shadows with as little noise as possible. We use a layered approach in the shadow map and reproject samples along the average motion vector, and then perform lookups in this representation.
Magnus Andersson +3 more
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Filtering the shadows from poorly illuminated photos
Proceedings of the 2010 ACM Symposium on Applied Computing, 2010This paper presents a new algorithm for filtering shadowy photos degraded by uneven light condition. The dark photos are harder to use for face recognition or even an analysis of the scene. Corrections can be made using commercial tools as Photoshop™ but this is done manually and it requires a specialized user.
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