Results 11 to 20 of about 4,633,372 (295)
Rendering Deformable Surface Reflectance Fields [PDF]
IEEE Transactions on Visualization and Computer Graphics, 2005 Animation of photorealistic computer graphics models is an important goal for many applications. Image-based modeling has emerged as a promising approach to capture and visualize real-world objects. Animating image-based models, however, is still a largely unsolved problem.
Tim Weyrich +2 more
openaire +8 more sources
Illumination invariance and shadow compensation on hyperspectral images [PDF]
, 2014 To obtain intrinsic reflectance of the scene by hyperspectral imaging systems has been a scientific and engineering challenge. Factors such as illumination variations, atmospheric effects and viewing geometries are common artefacts which modulate the way
Ibrahim, Izzati
core +7 more sources
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2022 Earth's surface reflectance is an important parameter affecting ultraviolet (UV) and visible (VIS) radiance calculations at the top of the atmosphere because many UV and VIS channels can acquire information about the surface and atmosphere.
Quanhua Liu +7 more
doaj +1 more source
On the Position of Intelligent Reflecting Surfaces
2021 Joint European Conference on Networks and Communications & 6G Summit (EuCNC/6G Summit), 2021 We study the positional impact of an intelligent reflecting surface (IRS) on the achievable rate for single and multiple antenna systems. We show that in IRS-aided single antenna systems, it is always best to place the IRS as close as possible to the transmitter or receiver since the large-scale fading for IRS-reflected links is the main factor that ...
Emad Ibrahim +2 more
openaire +3 more sources
Remote Sensing, 2022 Several global leaf area index (LAI) products were generated using neural networks, but the training dataset for the neural networks was sensor specific, and the construction of the training dataset was time consuming.
Juan Li +3 more
doaj +1 more source
Implementing a Dual-Spectrometer Approach for Improved Surface Reflectance Estimation
Remote Sensing, 2023 Surface reflectance measurement is an integral part of the vicarious calibration of satellite sensors and the validation of satellite-derived top-of-atmosphere (TOA) and surface reflectance products.
Mahesh Shrestha +6 more
doaj +1 more source
A Bayesian Reflection on Surfaces [PDF]
Entropy, 1999 The topic of this paper is a novel Bayesian continuous-basis field representation and inference framework. Within this paper several problems are solved: The maximally informative inference of continuous-basis fields, that is where the basis for the field is itself a continuous object and not representable in a finite manner; the tradeoff between ...
openaire +4 more sources
Remote Sensing, 2015 Land-surface reflectance, estimated from satellite observations through atmospheric corrections, is an essential parameter for further retrieval of various high level land-surface parameters, such as leaf area index (LAI), fraction of absorbed ...
Zhiqiang Xiao +3 more
doaj +1 more source
Lightdrum—Portable Light Stage for Accurate BTF Measurement on Site
Sensors, 2017 We propose a miniaturised light stage for measuring the bidirectional reflectance distribution function (BRDF) and the bidirectional texture function (BTF) of surfaces on site in real world application scenarios. The main principle of our lightweight BTF
Vlastimil Havran +4 more
doaj +1 more source
A Hyperspectral Bidirectional Reflectance Model for Land Surface
Sensors, 2020 A hyperspectral bidirectional reflectance (HSBR) model for land surface has been developed in this work. The HSBR model includes a very diverse land surface bidirectional reflectance distribution function (BRDF) database with ~40,000 spectra.
Qiguang Yang, Xu Liu, Wan Wu
doaj +1 more source