Results 221 to 230 of about 12,743 (257)

‘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.
openaire   +1 more source

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
openaire   +1 more source

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

Smooth shadow boundaries with exponentially warped Gaussian filtering

Computers & Graphics, 2013
This 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, Mateu Sbert, László Szirmay-Kalos, Miguel Chover, Carlos González   +4 more
openaire   +3 more sources

Efficient shadow map filtering

2008
Schatten 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.
openaire   +3 more sources

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

Filtered Stochastic Shadow Mapping Using a Layered Approach

Computer Graphics Forum, 2015
AbstractGiven 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, Jon Hasselgren, Jacob Munkberg, Tomas Akenine-Möller   +3 more
openaire   +1 more source

Noise Reduction of Chaotic Systems by Kalman Filtering and by Shadowing

International Journal of Bifurcation and Chaos, 1997
We 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.
openaire   +1 more source

Filtering the shadows from poorly illuminated photos

Proceedings of the 2010 ACM Symposium on Applied Computing, 2010
This 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.
openaire   +1 more source

Shadowed non-local image guided filter

Ninth International Conference on Graphic and Image Processing (ICGIP 2017), 2018
Guided image filter has been widely used in image processing. Considering the Non-local model is an excellent method for global information accumulation, the non-local image guided filter has been proposed and shown good performance in many image processing tasks by utilizing the non-local similarity of the guidance image. In this paper, we introduce a
C. L. Philip CHEN, LONG CHEN, LI GUO
openaire   +1 more source