Results overview: Found 10 records in 0.02 seconds.
Articles, 7 records found
Research literature, 3 records found
Articles 7 records found  
1.
11 p, 1.9 MB Assessing ecosystem isoprene emissions by hyperspectral remote sensing / Balzarolo, Manuela (Centre de Recerca Ecològica i Aplicacions Forestals) ; Peñuelas, Josep (Centre de Recerca Ecològica i Aplicacions Forestals) ; Filella Cubells, Iolanda (Centre de Recerca Ecològica i Aplicacions Forestals) ; Portillo-Estrada, Miguel (University of Antwerp. Center of Excellence PLECO) ; Ceulemans, Reinhart (University of Antwerp. Center of Excellence PLECO)
This study examined the relationship between foliar isoprene emissions, light use efficiency and photochemical reflectance index (PRI) throughout the canopy profile and explored the contribution of xanthophyll cycle pigments versus other carotenoid pigments to the isoprene/PRI relationship. [...]
2018 - 10.3390/rs10071086
Remote Sensing, Vol. 10, Núm. 7 (July 2018) , art. 1086  
2.
27 p, 2.9 MB Potential of Photochemical reflectance index for indicating photochemistry and light use efficiency in leaves of European beech and Norway spruce trees / Kováč, Daniel (Global Change Research Institute CAS) ; Veselovská, Petra (Global Change Research Institute CAS) ; Klem, Karel (Global Change Research Institute CAS) ; Večeřová, Kristýna (Global Change Research Institute CAS) ; Ač, Alexander (Global Change Research Institute CAS) ; Peñuelas, Josep (Centre de Recerca Ecològica i Aplicacions Forestals) ; Urban, Otmar (Global Change Research Institute CAS)
Hyperspectral reflectance is becoming more frequently used for measuring the functions and productivity of ecosystems. The purpose of this study was to re-evaluate the potential of the photochemical reflectance index (PRI) for evaluating physiological status of plants. [...]
2018 - 10.3390/rs10081202
Remote Sensing, Vol. 10, Núm. 8 (July 2018) , art. 1202  
3.
21 p, 1.8 MB Photochemical reflectance index (PRI) for detecting responses of diurnal and seasonal photosynthetic activity to experimental drought and warming in a Mediterranean shrubland / Zhang, Chao (Centre de Recerca Ecològica i Aplicacions Forestals) ; Filella Cubells, Iolanda (Centre de Recerca Ecològica i Aplicacions Forestals) ; Liu, Daijun (Centre de Recerca Ecològica i Aplicacions Forestals) ; Ogaya Inurrigarro, Romà (Centre de Recerca Ecològica i Aplicacions Forestals) ; Llusià Benet, Joan (Centre de Recerca Ecològica i Aplicacions Forestals) ; Asensio Abella, Ma. Dolores (Centre de Recerca Ecològica i Aplicacions Forestals) ; Peñuelas, Josep (Centre de Recerca Ecològica i Aplicacions Forestals)
Climatic warming and drying are having profound impacts on terrestrial carbon cycling by altering plant physiological traits and photosynthetic processes, particularly for species in the semi-arid Mediterranean ecosystems. [...]
2017 - 10.3390/rs9111189
Remote sensing, Vol. 9, Issue 11 (November 2017) , art. 1189  
4.
14 p, 2.0 MB Assessment of the response of photosynthetic activity of Mediterranean evergreen oaks to enhanced drought stress and recovery by using PRI and R690/R630 / Zhang, Chao (Centre de Recerca Ecològica i Aplicacions Forestals) ; Preece, Catherine (Centre de Recerca Ecològica i Aplicacions Forestals) ; Filella Cubells, Iolanda (Centre de Recerca Ecològica i Aplicacions Forestals) ; Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
The photochemical reflectance index (PRI) and red-edge region of the spectrum are known to be sensitive to plant physiological processes, and through measurement of these optical signals it is possible to use non-invasive remote sensing to monitor the plant photosynthetic status in response to environmental stresses such as drought. [...]
2017 - 10.3390/f8100386
Forests, Vol. 8, issue 10 (Oct. 2017) , art. 386  
5.
32 p, 461.9 KB Pollinators show flower colour preferences but flowers with similar colours do not attract similar pollinators / Reverté Saiz, Sara (Centre de Recerca Ecològica i Aplicacions Forestals) ; Retana Alumbreros, Javier (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia) ; Gómez Reyes, José María (Universidad de Granada) ; Bosch, Jordi, 1961- (Centre de Recerca Ecològica i Aplicacions Forestals)
Background and aims: colour is one of the main floral traits used by pollinators to locate flowers. Although pollinators show innate colour preferences, the view that the colour of a flower may be considered an important predictor of its main pollinators is highly controversial because flower choice is highly context-dependent, and initial innate preferences may be overridden by subsequent associative learning. [...]
2017 - 10.1093/aob/mcw103
Annals of botany, Vol. 118, issue 2 (Aug 2016) , p. 249–257  
6.
33 p, 5.0 MB Affecting factors and recent improvements of the photochemical reflectance index (PRI) for remotely sensing foliar, canopy and ecosystemic radiation-use efficiencies / Zhang, Chao (Centre de Recerca Ecològica i Aplicacions Forestals) ; Filella Cubells, Iolanda (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia) ; Garbulsky, Martín Fabio (University of Buenos Aires. Facultad de Agronomía) ; Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Accurately assessing terrestrial gross primary productivity (GPP) is crucial for characterizing the climate-carbon cycle. Remotely sensing the photochemical reflectance index (PRI) across vegetation functional types and spatiotemporal scales has received increasing attention for monitoring photosynthetic performance and simulating GPP over the last two decades. [...]
2016 - 10.3390/rs8090677
Remote sensing, Vol. 8, issue 9 (Aug. 2016) , p. 1-33  
7.
13 p, 2.1 MB Depth Recovery of Complex Surfaces from Texture-less Pairs of Stereo Images / Kumar, S. (University of Udine (Itàlia). Department of Mathematics and Computer Science) ; Kumary, M. (Indian Institute of Technology Roorkee. Department of Mathematics) ; Sukavanamy, N. (Indian Institute of Technology Roorkee. Department of Mathematics) ; Balasubramaniany, R. (Indian Institute of Technology Roorkee. Department of Mathematics) ; Bhargava, R. (Indian Institute of Technology Roorkee. Department of Mathematics)
In this paper, a novel framework is presented to recover the 3D shape information of a complex surface using its texture-less stereo images. First a linear and generalized Lambertian model is proposed to obtain the depth information by shape from shading (SfS) using an image from stereo pair. [...]
2009 - 10.5565/rev/elcvia.316
ELCVIA : Electronic Letters on Computer Vision and Image Analysis, V. 8 n. 1 (2009) p. 44-56  

Research literature 3 records found  
1.
8 p, 3.2 MB Intrinsic image properties from deep learning / Moyano Diaz, Victor ; Baldrich i Caselles, Ramon, dir. (Universitat Autònoma de Barcelona. Departament de Ciències de la Computació) ; Universitat Autònoma de Barcelona. Escola d'Enginyeria
A lot of computer vision algorithms have trouble performing as the should due the lighting conditions the images are exposed to. When the lighting conditions vary substantially, these algorithms are just not able to perform nicely. [...]
Són molts els algoritmes de visió per computador que no poden funcionar correctament quan les condicions d'il·luminació a les quals es troben exposades les imatges varien de forma substancial. Per aquest motiu, s'utilitza un model que proposa separar una imatge qualsevol en dues imatges diferents: Shading i Reflectància. [...]
Son muchos los algoritmos de visión por computador que no pueden funcionar correctamente cuando las condiciones de iluminación a las cuales se encuentran expuestas las imágenes varían de forma substancial. [...]

2018-07-02
Enginyeria Informàtica [958]  
2.
344.6 KB Spectral Library of Rooftop Urban Materials / Zambrano Prado, Perla (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals) ; Josa Garcia-Tornel, Alejandro (Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental) ; Rieradevall, Joan (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals) ; Gassó, Santiago (Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental) ; Gabarrell Durany, Xavier (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
The Spectral Library of Rooftop Urban Materials (SLyRUM) is divided into 6 sections according to material classes, including different types of ceramics, metals, plastics, roofing tile, rocks, concrete, and wood. [...]
Universitat Autònoma de Barcelona 2017 - 10.5565/ddd.uab.cat/196065
2 documents
3.
163 p, 2.1 MB Modeling, estimation and evaluation of intrinsic images considering color information / Serra Vidal, Marc ; Benavente i Vidal, Robert, dir. (Universitat Autònoma de Barcelona. Departament de Ciències de la Computació) ; Penacchio, Olivier, dir. (University of St Andrews. School of Psychology and Neuroscience) ; Universitat Autònoma de Barcelona. Departament de Ciències de la Computació
Els valors dels píxels de les imatges són el resultat d'una combinació d'informacions visuals provinents de múltiples fonts. Recuperar la informació dels múltiples factors que han produït una imatge sembla un problema molt difícil. [...]
Image values are the result of a combination of visual information coming from multiple sources. Recovering information from the multiple factors that produced an image seems a hard and ill-posed problem. [...]

[Barcelona] : Universitat Autònoma de Barcelona, 2015  

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