Sea Surface Object Recognition Under the Low-Light Environment

2018 ◽  
pp. 346-356
Author(s):  
Zihan Yue ◽  
Liang Shen ◽  
Wei Lin ◽  
Wu Lv ◽  
Shihao Liu ◽  
...  
Keyword(s):  
Object Recognition ◽  
Sea Surface ◽  
Light Environment ◽  
Low Light ◽  
Surface Object

scholarly journals Honing in on bioluminescent milky seas from space

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Steven D. Miller ◽  
Steven H. D. Haddock ◽  
William C. Straka ◽  
Curtis J. Seaman ◽  
Cynthia L. Combs ◽  
...  
Keyword(s):  
Scientific Inquiry ◽  
Water Mass ◽  
Marine Ecosystem ◽  
Sea Surface ◽  
Surface Currents ◽  
Maritime Continent ◽  
Low Light ◽  
Composition Formation ◽  
Mass Isolation ◽  
New Generation

AbstractMilky seas are a rare form of marine bioluminescence where the nocturnal ocean surface produces a widespread, uniform and steady whitish glow. Mariners have compared their appearance to a daylit snowfield that extends to all horizons. Encountered most often in remote waters of the northwest Indian Ocean and the Maritime Continent, milky seas have eluded rigorous scientific inquiry, and thus little is known about their composition, formation mechanism, and role within the marine ecosystem. The Day/Night Band (DNB), a new-generation spaceborne low-light imager, holds potential to detect milky seas, but the capability has yet to be demonstrated. Here, we show initial examples of DNB-detected milky seas based on a multi-year (2012–2021) search. The massive bodies of glowing ocean, sometimes exceeding 100,000 km2 in size, persist for days to weeks, drift within doldrums amidst the prevailing sea surface currents, and align with narrow ranges of sea surface temperature and biomass in a way that suggests water mass isolation. These findings show how spaceborne assets can now help guide research vessels toward active milky seas to learn more about them.

Study on the influence of an underground low-light environment on human safety behavior

2020 ◽  
pp. 1-10
Author(s):  
Jing Li ◽  
Zhen Wang ◽  
Yaru Qin ◽  
Ruikang Qi ◽  
Gui Fu ◽  
...  
Keyword(s):  
Light Environment ◽  
Safety Behavior ◽  
Low Light ◽  
Human Safety

Autonomous robot navigation using Retinex algorithm for multiscale image adaptability in low-light environment

2019 ◽  
Vol 12 (4) ◽  
pp. 359-369 ◽  
Author(s):  
Shuhuan Wen ◽  
Xueheng Hu ◽  
Jinrong Ma ◽  
Fuchun Sun ◽  
Bin Fang
Keyword(s):  
Robot Navigation ◽  
Autonomous Robot ◽  
Light Environment ◽  
Low Light ◽  
Retinex Algorithm ◽  
Autonomous Robot Navigation

Efficient ConvNet for Surface Object Recognition

2019 ◽  
pp. 308-317
Author(s):  
Wei Lin ◽  
Quan Chen ◽  
Xianzhi Qi ◽  
Bingli Wu ◽  
Xue Ke ◽  
...  
Keyword(s):  
Object Recognition ◽  
Surface Object

scholarly journals Low-Light Environment Neural Surveillance

2020 ◽  
Author(s):  
Michael Potter ◽  
Henry Gridley ◽  
Noah Lichtenstein ◽  
Kevin Hines ◽  
John Nguyen ◽  
...  
Keyword(s):  
Light Environment ◽  
Low Light

scholarly journals Robust Feature Detection Using 2D Wavelet Transform under Low Light Environment

10.5772/4970 ◽  
2007 ◽  
Author(s):  
Youngouk Kim ◽  
Jihoon Lee ◽  
Woon Cho ◽  
Changwoo Park ◽  
Changhan Park ◽  
...  
Keyword(s):  
Wavelet Transform ◽  
Feature Detection ◽  
Light Environment ◽  
Low Light

scholarly journals Additional radar signature for waterborne object recognition

2021 ◽  
Vol 26 (4) ◽  
pp. 16-21
Author(s):  
V. Gorobets’ ◽  
◽  
M. Golovko ◽  
S. Zotov ◽  
L. Kovorotny ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Object Recognition ◽  
Sea Surface ◽  
Phase Detector ◽  
Continuous Mode ◽  
Radar Signature ◽  
Mathematical Processing ◽  
Rough Sea Surface ◽  
Coherent Radar ◽  
Rough Sea

Subject and Purpose. The article is devoted to the radio recognition of moving waterborne objects (sea-going ships). The problem lies in the lack of radar signatures, which is especially true for coherent radar in continuous mode, implying that more signatures for the waterborne object recognition is highly needed. An additional signature can be gained just by means of a simple mathematical processing of target reflection signals. This is particularly important for radio recognition systems in current use because this will hardly complicate the system structure. Hence, it will not affect its cost either. Methods and Methodology. The method developed for the retrieval of an additional radar signature characteristic of waterborne objects moving across a rough sea surface is based on a simple mathematical processing of a signal reflected from the moving waterborne object and taken from the phase output of coherent radar. The method approbation is by the mathematical modeling of signals at the phase detector output in the event of three waterborne objects such that have identical scattering cross sections but different periods of the side and keel vibrations. Results. Based on the mathematical modeling results, it has been shown that each of the local scattering centers keeps the ratio of the linear speeds of side and keel vibrations approximately the same for the same object. But the employed ratio takes different values for different objects. Conclusion. Having a single standard coherent radar in continuous mode and guided by the developed methodology, one can gain an additional signature for the target recognition, which is a ratio of the linear speeds of side and keel vibrations of the target. The suggested methodology can be used for the radio recognition of waterborne objects moving across a rough sea surface.

scholarly journals ABSCISIC ACID DRENCHES IMPROVE POSTPRODUCTION SHELF LIFE OF IMPATIENS

HortScience ◽  
2006 ◽  
Vol 41 (3) ◽  
pp. 511E-512
Author(s):  
James L. Gibson ◽  
Shannon Crowley
Keyword(s):  
Abscisic Acid ◽  
Visual Quality ◽  
Light Environment ◽  
Light Conditions ◽  
Labor Costs ◽  
Flower Number ◽  
Low Light ◽  
Quality Ratings ◽  
Select Group ◽  
The Impact

Foliar sprays or root dips of synthetic abscisic acid (s-ABA) have shown to reduce the transpiration rate and subsequently prolong postharvest longevity in a select group of herbaceous ornamental crops. The objective of our study was to determine the impact of s-ABA on postproduction performance of seed impatiens in greenhouse or low light conditions. Market ready Impatiens wallerana `Xtreme Scarlet' plants were sprayed or the root substrate was drenched with s-ABA at 250 or 500 mg·L–1 then boxed for 48 h to represent shipping conditions. Flower number was measured 3 days after application, and again after plants were hydrated following the day when the last treatment wilted 0, 2, 4, 8, 16, or 24 days after application. Visual quality ratings were made 0, 2, 3, 4, 8, 11, 16, or 19 days after application and again after plants were re-irrigated. Drenching the substrate with s-ABA at 500 mg·L–1 maintained foliage and flower turgidity up to 8 days in the greenhouse environment and 16 days in the low light environment. Substrate drenches at 500 mg·L–1 dramatically decreased flower number after removal from the shipping box under greenhouse conditions, and in the low light environment drenching the substrate at 250 mg·L–1 produced similar visual quality results to 500 mg·L–1 16 days after treatment. Plants drenched at 250 mg·L–1 also had the same number of flowers 3 and 20 days after treatment, when compared to 500 mg·L–1. Therefore, impatiens growers should drench the root substrate with s-ABA at 250 mg·L–1 to reduce labor costs associated with hand-watering and prolong postproduction performance in low light conditions, such as indoor retail conditions.

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