Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"underwater video"”.
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Implementation of a wireless underwater video link
Autonomous underwater vehicles (AUVs) are increasingly being considered for remotely supervised missions, primarily for routine subsea inspection tasks currently performed by tethered remotely operated vehicles (ROVs). This project is a step in the development of a high speed, networked wireless …
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Compression of underwater video sequences with quantizer/position-dependent encoding
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Design and analysis of a high-rate acoustic link for underwater video transmission
A high bit rate acoustic link for underwater video transmission is examined. Currently, encoding standards support video transmission at bit rates as low as 64 kbps. While this rate is still above the limit of commercially available acoustic modems, prototype acoustic modems based on phase coherent …
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Baited remote underwater video survey of macro-invertebrate distribution and abundance across False Bay, South Africa
Assessing invertebrate species diversity and distribution based on environmental predictors is essential for conservation planning. South Africa need to understand ecological patterns to better plan for species conservation. South Africa’s unique coastline requires additional protection, but the …
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Baited remote underwater video survey of reef fish in the Stilbaai marine protected area, with an assessment of monitoring requirements
… along the South African coastline. Baited remote underwater video (BRUV) technology offers non-extractive monitoring with lower labour and cost requirements, whilst eliminating inter-observer variability and increasing statistical power. Species richness and relative abundance were assessed …
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Patterns in reef fish assemblages as determined by baited remote underwater video (BRUV) along the western side of False Bay: effects of site, depth and protection status
… and properly interpreted. Baited remote underwater video (BRUV) was used to examine the effects of site, depth, andlevel of protection, on the diversity and relative abundance of temperate reef fish within the Table Mountain National Park (TMNP) Marine Protected Area (MPA). Four notake …
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A baited remote underwater video survey of the Goukamma Marine Protected Area's ichthyofauna and a subsequent community structure comparison with the Betty's Bay, Stilbaai, and Tsitsikamma Marine Protected Areas
… using controlled angling surveys (CAS) and underwater visual census (UVC) but has yet to be surveyed using baited remote underwater video (BRUV). I collected and analysed mono-BRUV data over five years to determine patterns in fish community structure in Goukamma and compare it to the …
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Down Stream [Appalachia]
… of reflective, refractive sculptures and underwater video footage, surrounded by fully-immersive spatial audio. Both the audio and visual elements react to audience presence and proximity. Species highlighted are the Candy Darter (Etheostoma osburni); the Cumberlandian Combshell …
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The stress of moving out : physiological and behavioural effects of commercial transport on Atlantic salmon (Salmo salar) smolts
… as well as behavioural observations made on underwater video footage. Seven transports of fish originating from two different hatcheries were sampled; one was a land-based tank hatchery that required a 30-min drive to the dock, and the other a lake net pen facility that was 90 min to the …
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Same-Sex Socio-Sexual Interactions Among a Group of Captive Bottlenose Dolphins (<i>Tursiops truncatus</i>)
… initiator/recipient role exchange was conducted. Underwater video footage of a colony of bottlenose dolphins housed at the Roatan Institute for Marine Sciences (RIMS), collected between March of 2010 and May of 2013, was analyzed. Associations occurring during homosexual interactions were …
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Using Personality Traits to Predict Pectoral Fin Contact Initiation Role in Bottlenose Dolphins (<i>Tursiops truncatus</i>)
… contacts were selected from previously recorded underwater video observations of a bottlenose dolphin group under human care at the Roatan Institute for Marine Sciences (RIMS) between 2014 and 2017. Personality assessments were conducted by experienced trainers for dolphins using rating …
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Baited remote underwater survey of chondrichthyans in False Bay, South Africa
… most environmental conditions. Baited Remote Underwater Video (BRUV) surveys have shown major benefits over traditional capture-based survey methods in multiple areas. They have been shown to be non-extractive, causing no major disturbance to the substrata and its epibenthos. Large, mobile …
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An automated vision system for detection and counting of uneaten food pellets in a fish sea cage
… and counting of food pellets from recorded video image sequences, which could be used to determine actual feeding rates in a sea cage. The number of food pellets eaten over time is determined by counting the number of pellets not eaten. The method involves counting the number of pellets of a …
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Automating Video Analysis for Marine and Behavioural Research: Deep Learning Solutions to Analytical Bottlenecks
… insight from information-rich datasets such as video recordings. This thesis develops and validates deep learning methods to address this bottleneck, demonstrating how YOLO-based object detection can accelerate inference in video analysis and enable novel analyses. Chapter 2 presents an …
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Distribution and community structure of Chaetodontidae (Perciformes) in iSimangaliso Wetland Park with the view to applying the Butterflyfish Indicator Hypothesis in this region of South Africa
… transects across 13 dive sites were swum using Underwater Video Census (UVC) for data capture. Reef rugosity displayed no impact on any of the sampled factors, whilst site and protection level did. Protection was the factor with the greatest influence on butterflyfish species richness (df = 77, …
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Fish Assemblage Structure, Distribution, and Trophic Ecology at Northwestern Gulf of Mexico Banks
… and relation to habitat was based upon baited underwater video surveys conducted across a range of depths and habitats. Four distinct reef fish assemblages were resolved at the shelf-edge banks, the distribution of which corresponded to benthic habitat zonation. The specific habitat …
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Relationships Between Key Performance Indicators Across Four Swimming Strokes and by Distances in Competitive Swimmers
… Hero 8 device (GoPro, California, USA) collected underwater video to facilitate calculating KF (#/s). Descriptives were calculated for all variables across all four swimming strokes and two swim distances. Pearson product-moment correlations revealed significant relationships between select …
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The ecology and ecological enhancement of artificial coastal structures.
… contribution into the food web. Baited Remote Underwater Video (BRUV) and Stable Isotope Analysis (SIA) were used to assess the distribution of mobile fauna around pleasure piers and to determine if the mobile fauna were using the pier as a feeding resource. The results showed a greater number …
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The use of multibeam and split-beam echo sounders for assessing biomass and distribution of spring-spawning Atlantic cod in the Gulf of Maine
… movements of most individuals were observed with underwater video. The standard TS-L equations were TS = 20 log10(L) -- 66.4 at 38 kHz, TS = 20 log10(L) -- 67.4 at 120 kHz, and ⟨TS⟩ = 20 log10(L) -- 71.4 at 300 kHz. The study demonstrated a significant TS-L relation at 300 kHz from …
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Kōura (Paranephrops planifrons) populations in the Te Arawa lakes: An ecological assessment using the traditional Māori tau kōura harvesting method and recommendations for sustainable management
… sampling methods, baited traps, SCUBA and underwater video camera surveys had a number of disadvantages. Trapping was found to be highly biased towards large individuals and complicated by reductions in bait quality with time and changes in natural food abundance. SCUBA and underwater video …
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