نتایج جستجو برای: high radiance

تعداد نتایج: 2061833  

2006
John Gruninger William A. M. Blumberg

Radiation transport modulates the spatial frequencies of atmospheric structures, acting as a low pass filter, which causes the power spectra of the accumulated radiance to have different power spectral slopes than the underlying atmospheric structure. Additional effects arise because of the non-stationarity of the atmosphere. The SHARC atmospheric radiance code is used to model both equilibrium...

2018
Ching-Chieh Chiu Yu-Shu Lin

We propose a progressive radiance estimation engine (PREE) hardware architecture to accelerate the processing of the progressive photon mapping with satisfactory graphic quality. The presented PREE architecture consists of four progressive radiance estimation units (PREUs), approximate full task schedule-oriented hit-point update operation controller (AFTSO-HpUOC) and approximate data-independe...

2004
Thomas Annen Jan Kautz Frédo Durand Hans-Peter Seidel

Spherical harmonics are often used for compact description of incident radiance in low-frequency but distant lighting environments. For interaction with nearby emitters, computing the incident radiance at the center of an object only is not sufficient. Previous techniques then require expensive sampling of the incident radiance field at many points distributed over the object. Our technique all...

2003
Stefano Soatto Anthony J. Yezzi Hailin Jin

To what extent can three-dimensional shape and radiance be inferred from a collection of images? Can the two be estimated separately while retaining optimality? How should the optimality criterion be computed? When is it necessary to employ an explicit model of the reflectance properties of a scene? In this paper we introduce a separation principle for shape and radiance estimation that applies...

2008
Elizabeth Winstanley

We study in detail the modes of a classical scalar field on a KerrNewman-anti-de Sitter (KN-AdS) black hole. We construct sets of basis modes appropriate to the two possible boundary conditions (“reflective” and “transparent”) at time-like infinity, and consider whether super-radiance is possible. If we employ “reflective” boundary conditions, all modes are non-super-radiant. On the other hand,...

1996
P. D. Brown S. A. Clough N. E. Miller T. R. Shippert

The evaluation and improvement of radiative transfer calculations are essential to attain improved performance of general circulation models (GCMs) for climate change applications. A Quality Measurement Experiment (QME) is being conducted to analyze the spectral residuals between the downwelling longwave radiance measured by the University of Wisconsin Atmospheric Emitted Radiance Interferomete...

1996
Richard B. Rood Joanna Joiner Arlindo M. da Silva

Two basic approaches have evolved to utilize radiance measurements (i.e., thermal radiation or scattered solar radiation) from satellite-borne instruments in data assimilation systems. The radiances (raw or cloud-corrected) may be assimilated directly or alternatively they may be pre-processed to retrieve geophysical parameters that are then assimilated. The retrieval process is often ill-posed...

Journal: :Comput. Graph. Forum 2015
Andreas Reich Tobias Günther Thorsten Grosch

Progressive light transport simulations aspire a physically-based, consistent rendering to obtain visually appealing illumination effects, depth and realism. Thereby, the handling of large scenes is a difficult problem, as in typical scene subdivision approaches the parallel processing requires frequent synchronization due to the bouncing of light throughout the scene. In practice, however, onl...

2006
Karol Myszkowski Mathias Paulin Ivana Kolingerová M. Jiřı́ Sochor

Computation of global illumination is an important means in the pursuit of photorealism of computer-generated images. It is of particular importance in scenes with glossy surfaces, since it conditions correct perception of glossy material characteristics. This dissertation focuses on efficient computation of global illumination in presence of glossy surfaces with low-frequency reflectance funct...

1994
Joseph P. Hoffbeck David A. Landgrebe

Many analysis algorithms for high-dimensional remote sensing data require that the remotely sensed radiance spectra be transformed to approximate reflectance to allow comparison with a library of laboratory reflectance spectra. In maximum likelihood classification, however, the remotely sensed spectra are compared to training samples, thus a transformation to reflectance may or may not be helpf...

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