[POSTER] Retrieving Lights Positions Using Plane Segmentation with Diffuse Illumination Reinforced with Specular Component

2015 ◽  
Author(s):  
Paul-Emile Buteau ◽  
Hideo Saito
Keyword(s):  
Diffuse Illumination ◽  
Specular Component

Method for site characterization of anisotropic diffuse illumination of photovoltaic systems

2012 ◽  
Author(s):  
Juan M. Russo ◽  
Deming Zhang ◽  
Shelby Vorndran ◽  
Michael Gordon ◽  
Jose Castillo ◽  
...  
Keyword(s):  
Site Characterization ◽  
Photovoltaic Systems ◽  
Diffuse Illumination

Microphotometry of Underwater Shadowing by a Moss from a Niagara Escarpment Waterfall

2010 ◽  
Vol 17 (1) ◽  
pp. 125-131
Author(s):  
Howard J. Swatland
Keyword(s):  
Point Source ◽  
Single Cells ◽  
Incident Light ◽  
Polarized Light ◽  
Specular Reflectance ◽  
Light Spectra ◽  
Niagara Escarpment ◽  
Single Leaf ◽  
Diffuse Illumination ◽  
Air Water Interface

AbstractMicroscope and fiber-optic spectrophotometry of transmittance and backscattering both showed moss leaves to be capable of casting strong shadows, with a single leaf blocking approximately 90% of incident light from a point source. In leaves with only one layer of cells, the transmittance through the cytoplasm of single cells was similar to that for whole leaves. Analysis of cell wall birefringence by polarized-light interferometry indicated that cell walls might normally scatter rather than transmit light. Spectra transmitted through, or backscattered from, the upper green layers of moss were dominated by selective absorbance from chlorophyll, but there was also evidence of wavelength-dependent scattering, as detected in the lower layers of brown, dead moss. Specular reflectance from moss leaves was detected by polarimetry and may have contributed to the relatively high macroscopic transmittance of stationary moss in water. Shadowing by moss leaves was confirmed by dynamic measurements of mosses in turbulent water without bubbles. Flicker patterns from leaves were superimposed on the underwater flicker pattern created at the air-water interface, thus flecks of light were reduced in intensity, increased in frequency, and decreased in duration. This was detected with both point source and diffuse illumination of samples.

scholarly journals Image Classification for Automated Image Cross-Correlation Applications in the Geosciences

2019 ◽  
Vol 9 (11) ◽  
pp. 2357 ◽  
Author(s):  
Niccolò Dematteis ◽  
Daniele Giordan ◽  
Paolo Allasia
Keyword(s):  
Cross Correlation ◽  
Earth Science ◽  
Operative Procedure ◽  
Support Vector ◽  
Diffuse Illumination ◽  
Monitoring Applications ◽  
Correlation Processing ◽  
Classification Of Images ◽  
Active Processes

In Earth Science, image cross-correlation (ICC) can be used to identify the evolution of active processes. However, this technology can be ineffective, because it is sometimes difficult to visualize certain phenomena, and surface roughness can cause shadows. In such instances, manual image selection is required to select images that are suitably illuminated, and in which visibility is adequate. This impedes the development of an autonomous system applied to ICC in monitoring applications. In this paper, the uncertainty introduced by the presence of shadows is quantitatively analysed, and a method suitable for ICC applications is proposed: The method automatically selects images, and is based on a supervised classification of images using the support vector machine. According to visual and illumination conditions, the images are divided into three classes: (i) No visibility, (ii) direct illumination and (iii) diffuse illumination. Images belonging to the diffuse illumination class are used in cross-correlation processing. Finally, an operative procedure is presented for applying the automated ICC processing chain in geoscience monitoring applications.

scholarly journals Embodied lenses for collaborative visual queries on tabletop displays

2012 ◽  
Vol 11 (4) ◽  
pp. 319-338 ◽  
Author(s):  
KyungTae Kim ◽  
Niklas Elmqvist
Keyword(s):  
Formative Evaluation ◽  
User Study ◽  
Conceptual Models ◽  
Virtual Space ◽  
Multidimensional Data ◽  
Physical Interaction ◽  
Tabletop Displays ◽  
Multidimensional Data Visualization ◽  
Diffuse Illumination ◽  
Free Interaction

We introduce embodied lenses for visual queries on tabletop surfaces using physical interaction. The lenses are simply thin sheets of paper or transparent foil decorated with fiducial markers, allowing them to be tracked by a diffuse illumination tabletop display. The physical affordance of these embodied lenses allow them to be overlapped, causing composition in the underlying virtual space. We perform a formative evaluation to study users’ conceptual models for overlapping physical lenses. This is followed by a quantitative user study comparing performance for embodied versus purely virtual lenses. Results show that embodied lenses are as efficient as purely virtual lenses, and also support tactile and eyes-free interaction. We then present several examples of the technique, including image layers, map layers, image manipulation, and multidimensional data visualization. The technique is simple, cheap, and can be integrated into many existing tabletop displays.

scholarly journals Directional reflectance and milli-scale feather morphology of the African Emerald Cuckoo, Chrysococcyx cupreus

2013 ◽  
Vol 10 (86) ◽  
pp. 20130391 ◽  
Author(s):  
Todd Alan Harvey ◽  
Kimberly S. Bostwick ◽  
Steve Marschner
Keyword(s):  
Light Propagation ◽  
Scale Structure ◽  
Far Field ◽  
The Subject ◽  
Ct Data ◽  
Visual Signalling ◽  
Specular Component ◽  
Directional Reflectance

Diverse plumages have evolved among birds through complex morphological modifications. We investigate how the interplay of light with surface and subsurface feather morphology determines the direction of light propagation, an understudied aspect of avian visual signalling. We hypothesize that milli-scale modifications of feathers produce anisotropic reflectance, the direction of which may be predicted by the orientation of the milli-scale structure. The subject of this study is the African Emerald Cuckoo, Chrysococcyx cupreus , noted for its shimmering green iridescent appearance. Using a spherical gantry, we measured the change in the directional reflectance across the feather surface and over a hemisphere of incident lighting directions. Using a microCT scanner, we also studied the morphology of the structural branches of the barb. We tracked the changes in the directional reflectance to the orientation of the structural branches as observed in the CT data. We conclude that (i) the far-field signal of the feather consists of multiple specular components, each associated with a different structural branch and (ii) the direction of each specular component is correlated to the orientation of the corresponding structure.

scholarly journals Detection of ice crystal particles preferably oriented in the atmosphere by use of the specular component of scattered light

2008 ◽  
Vol 16 (11) ◽  
pp. 7625 ◽  
Author(s):  
Anatoli Borovoi ◽  
Victor Galileiskii ◽  
Alexander Morozov ◽  
Ariel Cohen
Keyword(s):  
Scattered Light ◽  
Ice Crystal ◽  
Specular Component
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