scholarly journals Real world colour constancy - the effect of surface material

2012 ◽  
Vol 12 (9) ◽  
pp. 951-951
Author(s):  
A. Werner ◽  
L. Zebrowski
Keyword(s):  
Real World ◽  
Surface Material ◽  
Colour Constancy ◽  
Effect Of Surface

Water Film Depth Prediction Model for Highly Textured Pavement Surface Drainage

2021 ◽  
pp. 036119812110363
Author(s):  
Alireza Pourhassan ◽  
Ahmed A. Gheni ◽  
Mohamed A. ElGawady
Keyword(s):  
Prediction Model ◽  
Water Film ◽  
Crumb Rubber ◽  
Surface Material ◽  
Textured Surfaces ◽  
Road Traffic Safety ◽  
Material Type ◽  
Chip Seal ◽  
On Chip ◽  
Effect Of Surface

Water film depth (WFD) is an important factor for road traffic safety because of its direct connection with skid resistance, hydroplaning speed, and the tendency of splash and spray. Increasing the pavement macrotexture reduces WFD. However, existing models for WFD prediction have not been developed on highly textured surfaces such as chip seal. Furthermore, the rainfall intensities used for developing most of these models were relatively low, leaving no or low WFD on chip seal surfaces. To propose a WFD prediction model suitable for highly textured surfaces and to consider the effect of surface material type, an experimental study was conducted with 154 different combinations of mean texture depth (MTD), surface material type, surface slope, drainage length, and rainfall intensity. The tests were carried out on chip seal specimens using a full-scale rainfall simulator. Test results from 1,784 WFD readings indicated that the Gallaway and PAVDRN models were not accurate for highly textured surfaces used in this study with MTD ranging from 0.05 to 0.20 in. Two experimental models were, therefore, proposed to predict the WFD; both models displayed a significantly higher correlation between the measured and predicted WFD compared with the existing models. Furthermore, the eco-friendly rubberized chip seal showed an enhanced drainage capability compared with conventional chip seal, especially in low slopes, because of the hydrophobic nature of crumb rubber versus the hydrophilic character of mineral aggregates. Accordingly, the proposed model incorporated a term to consider the effect of surface material type.

scholarly journals Colour Constancy by Illumination Matching in Real World Scenes

2012 ◽  
Vol 12 (9) ◽  
pp. 57-57
Author(s):  
B. Pearce ◽  
S. Crichton ◽  
M. Mackiewicz ◽  
G. Finlayson ◽  
A. Hurlbert
Keyword(s):  
Real World ◽  
Colour Constancy

scholarly journals Revisiting and Optimising a CNN Colour Constancy Method for Multi-Illuminant Estimation

2021 ◽  
Vol 2021 (1) ◽  
pp. 68-72
Author(s):  
Ghalia Hemrit ◽  
Joseph Meehan
Keyword(s):  
Real World ◽  
State Of The Art ◽  
Colour Constancy ◽  
Illuminant Estimation ◽  
Art Methods ◽  
Deep Cnn ◽  
Scene Illumination ◽  
Visual Results

The aim of colour constancy is to discount the effect of the scene illumination from the image colours and restore the colours of the objects as captured under a ‘white’ illuminant. For the majority of colour constancy methods, the first step is to estimate the scene illuminant colour. Generally, it is assumed that the illumination is uniform in the scene. However, real world scenes have multiple illuminants, like sunlight and spot lights all together in one scene. We present in this paper a simple yet very effective framework using a deep CNN-based method to estimate and use multiple illuminants for colour constancy. Our approach works well in both the multi and single illuminant cases. The output of the CNN method is a region-wise estimate map of the scene which is smoothed and divided out from the image to perform colour constancy. The method that we propose outperforms other recent and state of the art methods and has promising visual results.

scholarly journals Surface Sampling of Spores in Dry-Deposition Aerosols

2008 ◽  
Vol 75 (1) ◽  
pp. 39-44 ◽  
Author(s):  
Jason M. Edmonds ◽  
Patricia J. Collett ◽  
Erica R. Valdes ◽  
Evan W. Skowronski ◽  
Gregory J. Pellar ◽  
...  
Keyword(s):  
Surface Properties ◽  
Real World ◽  
Dry Deposition ◽  
Standard Sample ◽  
Biological Agents ◽  
Surface Material ◽  
Surface Sampling ◽  
Sample Collection ◽  
Spore Deposition ◽  
Liquid Deposition

ABSTRACT The ability to reliably and reproducibly sample surfaces contaminated with a biological agent is a critical step in measuring the extent of contamination and determining if decontamination steps have been successful. The recovery operations following the 2001 attacks with Bacillus anthracis spores were complicated by the fact that no standard sample collection format or decontamination procedures were established. Recovery efficiencies traditionally have been calculated based upon biological agents which were applied to test surfaces in a liquid format and then allowed to dry prior to sampling tests, which may not be best suited for a real-world event with aerosolized biological agents. In order to ascertain if differences existed between air-dried liquid deposition and biological spores which were allowed to settle on a surface in a dried format, a study was undertaken to determine if differences existed in surface sampling recovery efficiencies for four representative surfaces. Studies were then undertaken to compare sampling efficiencies between liquid spore deposition and aerosolized spores which were allowed to gradually settle under gravity on four different test coupon types. Tests with both types of deposition compared efficiencies of four unique swabbing materials applied to four surfaces with various surface properties. Our studies demonstrate that recovery of liquid-deposited spores differs significantly from recovery of dry aerosol-deposited spores in most instances. Whether the recovery of liquid-deposited spores is overexaggerated or underrepresented with respect to that of aerosol-deposited spores depends upon the surface material being tested.

scholarly journals Colour Calibration of a Head Mounted Display for Colour Vision Research Using Virtual Reality

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Raquel Gil Rodríguez ◽  
Florian Bayer ◽  
Matteo Toscani ◽  
Dar’ya Guarnera ◽  
Giuseppe Claudio Guarnera ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Real World ◽  
Vision Research ◽  
Colour Vision ◽  
Software Implementation ◽  
Field Of View ◽  
Large Field ◽  
Colour Constancy ◽  
Head Mounted Display ◽  
Colour Appearance

AbstractVirtual reality (VR) technology offers vision researchers the opportunity to conduct immersive studies in simulated real-world scenes. However, an accurate colour calibration of the VR head mounted display (HMD), both in terms of luminance and chromaticity, is required to precisely control the presented stimuli. Such a calibration presents significant new challenges, for example, due to the large field of view of the HMD, or the software implementation used for scene rendering, which might alter the colour appearance of objects. Here, we propose a framework for calibrating an HMD using an imaging colorimeter, the I29 (Radiant Vision Systems, Redmond, WA, USA). We examine two scenarios, both with and without using a rendering software for visualisation. In addition, we present a colour constancy experiment design for VR through a gaming engine software, Unreal Engine 4. The colours of the objects of study are chosen according to the previously defined calibration. Results show a high-colour constancy performance among participants, in agreement with recent studies performed on real-world scenarios. Our studies show that our methodology allows us to control and measure the colours presented in the HMD, effectively enabling the use of VR technology for colour vision research.

Effect of surface material and roughness on conductance of channel between parallel disks at molecular flow

2010 ◽  
Vol 28 (4) ◽  
pp. 937-941 ◽  
Author(s):  
Hajime Yoshida ◽  
Masanori Shiro ◽  
Kenta Arai ◽  
Masahiro Hirata ◽  
Hitoshi Akimichi
Keyword(s):  
Molecular Flow ◽  
Surface Material ◽  
Parallel Disks ◽  
Effect Of Surface
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