Difference between revisions of "Application and use of underwater video"
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| − | This article is about the history and application of [[underwater video]]. Related articles are | + | |
| + | This article is about the history and application of [[underwater video]]. Related articles are [[underwater video systems]], which is about equipment of underwater video systems; and [[video technology]], which deals with video as such. Video imaging in wells and boreholes is similar to [[underwater video]], but puts constraints on the shape and size of the equipment, as does for example underwater video in sewer pipes, nuclear power plants or fish tanks. | ||
==History== | ==History== | ||
| − | The first attempts in the field of [http://en.wikipedia.org/wiki/Underwater_photography underwater photography] were made with a pole mounted [http://en.wikipedia.org/wiki/Camera camera] in the 1850s by the British William Thompson, and several successful attempts were made over the next decades. The first published scientific results from an underwater camera are from 1890 and were made by the French naturalist Louis Boutan <ref name="boutan"> Boutan, L. (1893); Mémoire sur la Photographie Sous-Marine; Archives de Zoologie Expérimentale et Générale; 3ème sér., 1, pp. 281-324 </ref> who developed underwater photography to a useful method, inventing the underwater flash and other equipment. Photographic techniques, including [http://en.wikipedia.org/wiki/Cinematography cinematography], were used exclusively for many years, as television at that time was at its very earliest development stage. | + | The first attempts in the field of [http://en.wikipedia.org/wiki/Underwater_photography underwater photography] were made with a pole mounted [http://en.wikipedia.org/wiki/Camera camera] in the 1850s by the British William Thompson, and several successful attempts were made over the next decades. The first published scientific results from an underwater camera are from 1890 and were made by the French naturalist Louis Boutan (1893<ref name="boutan"> Boutan, L. (1893); Mémoire sur la Photographie Sous-Marine; Archives de Zoologie Expérimentale et Générale; 3ème sér., 1, pp. 281-324 </ref>) who developed underwater photography to a useful method, inventing the underwater flash and other equipment. Photographic techniques, including [http://en.wikipedia.org/wiki/Cinematography cinematography], were used exclusively for many years, as television at that time was at its very earliest development stage. |
| − | Underwater [http://en.wikipedia.org/wiki/Video video] has existed since the 1940s. The first published results are by Harvey Barnes in Nature (1952 | + | Underwater [http://en.wikipedia.org/wiki/Video video] has existed since the 1940s. The first published results are by Harvey Barnes in Nature (1952<ref name="barnes">Barnes, H. (1952)); Underwater television and marine biology; Nature, 169, pp. 477–479</ref>, but it is mentioned in the article that the [http://en.wikipedia.org/wiki/Admiralty Admiralty] (UK) made successful attempts before that, and that Barnes himself started development of the method in 1948. |
| − | [[Image:UWVideo_Boutan.jpg|thumb| | + | |
| + | [[Image:UWVideo_Boutan.jpg|thumb|450px|left|Figure 1: Louis Boutan, the first published underwater photographer pioneered not only photography, but diving equipment in general]] | ||
[[Image:UWVideo_Barnes.jpg|thumb|225px|none|Figure 2: The first published article on underwater video featured a picture of nothern krill, Meganyctiphanes norvegica. The size of these are normally 25-30 mm.]] | [[Image:UWVideo_Barnes.jpg|thumb|225px|none|Figure 2: The first published article on underwater video featured a picture of nothern krill, Meganyctiphanes norvegica. The size of these are normally 25-30 mm.]] | ||
<br style="clear:both;"/> | <br style="clear:both;"/> | ||
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Since then, underwater video has been used for many purposes. The references given are not selected to be the first published results (although they may be), but only given as examples and starting points for a selected few applications. | Since then, underwater video has been used for many purposes. The references given are not selected to be the first published results (although they may be), but only given as examples and starting points for a selected few applications. | ||
| − | From the start, underwater video has been used for marine biological studies (see also Figure 3). It may be | + | From the start, underwater video has been used for marine biological studies (see also Figure 3). It may be abundance (Smith & Papadopoulou, 2003<ref name="Smith">Smith, C. J., Papadopoulou, K.-N. (2003); Burrow density and stock size fluctuations of Nephrops norvegicus in a semi-enclosed bay; ICES Journal of Marine Science; 60, pp. 798–805</ref>; Moser et al, 1998<ref name="Moser">Moser, M. L., Auster P. J., Bichy, J. B. (1998); Effects of mat morphology on large Sargassum-associated fishes: observations from a remotely operated vehicle (ROV) and free-floating video camcorders; Environmental Biology of Fishes; 51, pp. 391–398</ref>) behavioural studies (Grémillet et al, 2006<ref name="Gremillet>Grémillet, D., Enstipp, M. R., Boudiffa, M., Liu, H. (2006); Do cormorants injure fish without eating them? An underwater video study; Marine Biology; 148, pp. 1081–1087 </ref>; Esteve, 2007<ref name="Esteve"> Esteve, M. (2007);Two examples of fixed behavioural patterns in salmonines: female false spawning and male digging; Journal of Ethology; 25:1, pp. 63-70</ref>) [[habitat mapping]] (Ryan et al, 2007<ref name="Ryan"> Ryan, D. A., Brooke, B. P., Collins, L. B., Kendrick, G. A., Baxter, K. J., Bickers, A. N., Siwabessy, P. J. W., Pattiaratchi, C. B. (2007); The influence of geomorphology and sedimentary processes on shallow-water benthic habitat distribution: Esperance Bay, Western Australia; Estuarine, Coastal and Shelf Science; 72:1-2, pp. 379-386</ref>; Abdo et al, 2004<ref name="Abdo">Abdo, D., Burgess, G., Coleman, K. (2004); Surveys of benthic reef communities using underwater video; Long-term monitoring of the great Barrier reef Standard Operational Procedure Number 2, 3rd Revised Edition; Australian Institute of Marine Science, Townsville 2004; ISBN0-64232231</ref>) |
| − | <ref name="Smith">Smith, C. J., Papadopoulou, K.-N. (2003); Burrow density and stock size fluctuations of Nephrops norvegicus in a semi-enclosed bay; ICES Journal of Marine Science; 60, pp. 798–805</ref> <ref name="Moser">Moser, M. L., Auster P. J., Bichy, J. B. (1998); Effects of mat morphology on large Sargassum-associated fishes: observations from a remotely operated vehicle (ROV) and free-floating video camcorders; Environmental Biology of Fishes; 51, pp. 391–398</ref> | + | studies of [[Effects of fisheries on marine biodiversity|fishing]] and [[Effects of fisheries on marine biodiversity|trawling]] (Zhou & Shirley (1997<ref name="Zhou">Zhou, S. Shirley T. C. (1997); Performance of two red king crab pot designs; Canadian Journal of Fisheries and Aquatic Sciences / Journal canadien des sciences halieutiques et aquatiques; 54, pp 1858–1864</ref>; Cooper and Hickey, 1987<ref name="Cooper">Cooper, C., Hickey, W. (1987); Selectivity experiments with square mesh cod-ends on haddock and cod; IEEE OCEANS; 19, pp. 608-613</ref>) |
| − | studies of [ | + | and whether the seabed is damaged or not by it (Vorbeg, 2000<ref name="Vorberg">Vorberg, R. (2000); Effects of shrimp fisheries on reefs of Sabellaria spinulosa (Polychaeta); ICES Journal of Marine Science; 57 pp. 1416–1420</ref>; Linnanne et al, 2000<ref name="Linnane">Linnane A., Ball B., Munday B., van Marlen B., Bergman M., Fonteyne R. (2000): A review of potential techniques to reduce the environmental impact of demersal trawl; Irish Fisheries Investigation Series Publications (New Series) No. 7; ISSN0578-7467</ref>) even in combination with a water sampler (Dounas, 2006<ref name="Dounas">Dounas, C. G. (2006); A new apparatus for the direct measurement of the effects of otter trawling on benthic nutrient releases; Journal of Experimental Marine Biology and Ecology; 339, pp. 251 – 259</ref>) and to separate living [[Coral reefs|corals]] from dead (Harris et al, 2004<ref name="Harris">Harris, P. T., Heap, A. D., Wassenberg, T., Passlow, V. (2004); Submerged coral reefs in the Gulf of Carpentaria, Australia; Marine Geology; 207:1-4, pp. 185-191</ref>.) |
| − | and whether the seabed is damaged or not by it <ref name="Vorberg">Vorberg, R. (2000); Effects of shrimp fisheries on reefs of Sabellaria spinulosa (Polychaeta); ICES Journal of Marine Science; 57 pp. 1416–1420</ref> <ref name="Linnane">Linnane A., Ball B., Munday B., van Marlen B., Bergman M., Fonteyne R. (2000): A review of potential techniques to reduce the environmental impact of demersal trawl; Irish Fisheries Investigation Series Publications (New Series) No. 7; ISSN0578-7467</ref> even in combination with a water sampler <ref name="Dounas">Dounas, C. G. (2006); A new apparatus for the direct measurement of the effects of otter trawling on benthic nutrient releases; Journal of Experimental Marine Biology and Ecology; 339, pp. 251 – 259</ref> and to separate living [ | ||
| − | It has also been used for [http://en.wikipedia.org/wiki/Marine_geology marine geology] | + | It has also been used for [http://en.wikipedia.org/wiki/Marine_geology marine geology] (Field et al, 1981<ref name="Field">Field, M. E., Nelson, C. H., Cacchione, D. A., Drake, D. E. (1981); Sand waves on an epicontinental shelf: Northern Bering Sea; Marine Geology; 42:1-4, pp. 233-258</ref>), [http://en.wikipedia.org/wiki/Sediment sediment] studies |
| − | <ref name="Field">Field, M. E., Nelson, C. H., Cacchione, D. A., Drake, D. E. (1981); Sand waves on an epicontinental shelf: Northern Bering Sea; Marine Geology; 42:1-4, pp. 233-258</ref>, [http://en.wikipedia.org/wiki/Sediment sediment] studies | + | (Osborne & Greenwood (1991)<ref name="Osborne">Osborne, P. D., Greenwood B. (1991); Frequency dependent cross-shore suspended sediment transport. 2. A barred shoreface; Marine Geology; 106, pp. 25-51 </ref>), [http://en.wikipedia.org/wiki/Tidal tidal] microtopography (Lund-Hansen et al, 2004<ref name="LundHansen">Lund-Hansen L., Larsen E., Jensen K., Mouritsen K., Christiansen C., Andersen T., Vølund G. (2004); A new video and digital camera system for studies of the dynamics of microtopographic features on tidal flats; Marine Georesources and Geotechnology; 22: 1-2, pp. 115-122</ref>), [http://en.wikipedia.org/wiki/Bridge bridge] (DeVault, 2000<ref name="DeVault">DeVault, J.E. (2000); Robotic system for underwater inspection of bridge piers; Instrumentation & Measurement Magazine, IEEE; 3:3, pp. 32-37</ref>) and [http://en.wikipedia.org/wiki/Pipeline_transport pipeline] (Gracias & Santos-Victor, 2000<ref name="Gracias">Gracias, N., Santos-Victor, J. (2000); Underwater Video Mosaics as Visual Navigation Maps; Computer Vision And Image Understanding; 79:1, pp. 66-91</ref>) |
| − | <ref name="Osborne">Osborne, P. D., Greenwood B. (1991); Frequency dependent cross-shore suspended sediment transport. 2. A barred shoreface; Marine Geology; 106, pp. 25-51 </ref>, [http://en.wikipedia.org/wiki/Tidal tidal] microtopography | + | inspections, sports (Blanksby et al, 2004<ref name="Blanksby">Blanksby, B. A., Skender, S., Elliott, B. C., McElroy, K., Landers, G. J. (2004); An Analysis of the Rollover Backstroke Turn by Age-Group Swimmers; Sports Biomechanics; 3:1, pp. 1-14</ref>) |
| − | <ref name="LundHansen">Lund-Hansen L., Larsen E., Jensen K., Mouritsen K., Christiansen C., Andersen T., Vølund G. (2004); A new video and digital camera system for studies of the dynamics of microtopographic features on tidal flats; Marine Georesources and Geotechnology; 22: 1-2, pp. 115-122</ref>, [http://en.wikipedia.org/wiki/Bridge bridge] | + | , [http://en.wikipedia.org/wiki/Marine_archaeology marine archaeology] (Coleman et al, 2000<ref name="Coleman">Coleman D. F., Newman J. B., Ballard R. D (2000); Design and implementation of advanced underwater imaging systems for deep sea marine archaeological surveys; OCEANS 2000 MTS/IEEE Conference and Exhibition;1, pp. 661-665</ref>), entertainment, education and more. |
| − | <ref name="DeVault">DeVault, J.E. (2000); Robotic system for underwater inspection of bridge piers; Instrumentation & Measurement Magazine, IEEE; 3:3, pp. 32-37</ref> | ||
| − | and [http://en.wikipedia.org/wiki/Pipeline_transport pipeline] | ||
| − | <ref name="Gracias">Gracias, N., Santos-Victor, J. (2000); Underwater Video Mosaics as Visual Navigation Maps; Computer Vision And Image Understanding; 79:1, pp. 66-91</ref> | ||
| − | inspections, sports | ||
| − | <ref name="Blanksby">Blanksby, B. A., Skender, S., Elliott, B. C., McElroy, K., Landers, G. J. (2004); An Analysis of the Rollover Backstroke Turn by Age-Group Swimmers; Sports Biomechanics; 3:1, pp. 1-14</ref> | ||
| − | , [http://en.wikipedia.org/wiki/Marine_archaeology marine archaeology] | ||
| − | <ref name="Coleman">Coleman D. F., Newman J. B., Ballard R. D (2000); Design and implementation of advanced underwater imaging systems for deep sea marine archaeological surveys; OCEANS 2000 MTS/IEEE Conference and Exhibition;1, pp. 661-665</ref> | ||
| − | , entertainment, education and more. | ||
The reasons for this widespread use are several. The most viable alternative to underwater video for making visual observations (if you want moving pictures!) is a to be a [http://en.wikipedia.org/wiki/Underwater_diving diver] or to use a waterscope. Both these methods have limitations regarding depth, observation time, temperature, accessibility, documentation procedures etc., that makes video superior in many of not most cases. | The reasons for this widespread use are several. The most viable alternative to underwater video for making visual observations (if you want moving pictures!) is a to be a [http://en.wikipedia.org/wiki/Underwater_diving diver] or to use a waterscope. Both these methods have limitations regarding depth, observation time, temperature, accessibility, documentation procedures etc., that makes video superior in many of not most cases. | ||
| − | A bibliometry made in 2000 | + | A bibliometry made in 2000 (Harvey & Mladenov, 2001<ref name="Harvey">Harvey, E., Mladenov, P. (2001); The uses of underwater television and video technology in marine science: a review; appears in Harvey, E.S. Cappo M.; Direct sensing of the size frequency and abundance of target and non-target fauna in Australian Fisheries - a national workshop. 4-7 September 2000, Rottnest Island, Western Australia. Fisheries Research Development Corporation; ISBN 1-740520580</ref>)shows that the number of papers in the study on underwater video peaks in the mid 1990s. The reason for this is probably that before this, the equipment was expensive and bulky, and thus not very apt for underwater use. The evolution of electronics made the video equipment small (and cheap) enough for widespread use in the 1990s, and many novel applications were reported. Today, papers about video technology per se are not as numerous – not because video is not used any more, but because video is a standard method. |
| − | <ref name="Harvey">Harvey, E., Mladenov, P. (2001); The uses of underwater television and video technology in marine science: a review; appears in Harvey, E.S. Cappo M.; Direct sensing of the size frequency and abundance of target and non-target fauna in Australian Fisheries - a national workshop. 4-7 September 2000, Rottnest Island, Western Australia. Fisheries Research Development Corporation; ISBN 1-740520580</ref> | ||
| − | shows that the number of papers in the study on underwater video peaks in the mid 1990s. The reason for this is probably that before this, the equipment was expensive and bulky, and thus not very apt for underwater use. The evolution of electronics made the video equipment small (and cheap) enough for widespread use in the 1990s, and many novel applications were reported. Today, papers about video technology per se are not as numerous – not because video is not used | ||
| − | In spite of this, there are many misconceptions and some confusion about the technology, in particular when it comes to the evolving digital video systems. Some of these are dealt with in other Coastal | + | In spite of this, there are many misconceptions and some confusion about the technology, in particular when it comes to the evolving digital video systems. Some of these are dealt with in other Coastal Wiki articles; i.e. [[underwater video systems]] about equipment and [[video technology]], which deals with video as such. |
== Pros and cons == | == Pros and cons == | ||
| − | For any mapping method there is a | + | For any mapping method there is a trade-off between [http://en.wikipedia.org/wiki/Image_resolution resolution], coverage, labor intensity and information content (Kautsky, 2006<ref name="Kautsky">Kautsky, H. (2006); Östersjöns vegetationsklädda bottnar sedda med olika ögon – hur slarvig får man vara; Proceedings of Marin Undersökningsteknik 2006 (MUT06); Engineering geology, Lund university, Lund</ref>) |
| − | <ref name="Kautsky">Kautsky, H. (2006); Östersjöns vegetationsklädda bottnar sedda med olika ögon – hur slarvig får man vara; Proceedings of Marin Undersökningsteknik 2006 (MUT06); Engineering geology, Lund university, Lund</ref> | ||
, see figure 4, where some video methods are compared to other. You may notice that video performs well in terms of resolution and information content, not so good when it comes to workload and areal coverage. | , see figure 4, where some video methods are compared to other. You may notice that video performs well in terms of resolution and information content, not so good when it comes to workload and areal coverage. | ||
[[Image:UWVideo_Fig1.png|thumb|650px|centre|Figure 4: Video methods compared to other methods. Modified after <ref name="Kautsky"/>]]. | [[Image:UWVideo_Fig1.png|thumb|650px|centre|Figure 4: Video methods compared to other methods. Modified after <ref name="Kautsky"/>]]. | ||
| − | One obvious advantage of video is, that you can use your most capable perceptional system – the [http://en.wikipedia.org/wiki/Visual_system vision]. What you get is what you see. As opposed to other imaging methods (for example [http://en.wikipedia.org/wiki/Hydroacoustics underwater acoustics]) you can see | + | One obvious advantage of video is, that you can use your most capable perceptional system – the [http://en.wikipedia.org/wiki/Visual_system vision]. What you get is what you see. As opposed to other imaging methods (for example [http://en.wikipedia.org/wiki/Hydroacoustics underwater acoustics]) you can see colours, shapes etc. (mostly) the way you are used to. |
[[Image:UWVideo_OresundExample.jpg|thumb|750px|centre|Figure 5: Here, the stony bottom of Öresund (the strait between Denmark and Sweden and one of the entries to the Baltic Sea) is shown as a frame from a video (right) and as an acoustic image from a Side Scan Sonar survey (left). Both representations have advantages and disadvantages and they should here be seen as complements rather than alternatives.]] | [[Image:UWVideo_OresundExample.jpg|thumb|750px|centre|Figure 5: Here, the stony bottom of Öresund (the strait between Denmark and Sweden and one of the entries to the Baltic Sea) is shown as a frame from a video (right) and as an acoustic image from a Side Scan Sonar survey (left). Both representations have advantages and disadvantages and they should here be seen as complements rather than alternatives.]] | ||
| − | The cost of a simple video system is nowadays not prohibitive. It is mostly non-intrusive and non-destructive; one exception is for example the REMOTS sediment profiler, vertically slicing the sediment-water interface and viewing the sediment in profile | + | The cost of a simple video system is nowadays not prohibitive. It is mostly non-intrusive and non-destructive; one exception is for example the REMOTS sediment profiler, vertically slicing the sediment-water interface and viewing the sediment in profile (Rhoads, Germano and Boyer, 1981<ref name="Rhoads">Rhoads, D., Germano, J., Boyer, L. (1981); Sediment Profile Imaging: An Efficient Method of Remote Ecological Monitoring of the Seafloor (REMOTS SYSTEM); IEEE OCEANS; 13:Sep 1981, pp. 561- 566</ref>). |
| − | <ref name="Rhoads">Rhoads, D., Germano, J., Boyer, L. (1981); Sediment Profile Imaging: An Efficient Method of Remote Ecological Monitoring of the Seafloor (REMOTS SYSTEM); IEEE OCEANS; 13:Sep 1981, pp. 561- 566</ref>. | ||
Another advantage is that it is easy to communicate results to both peers and to non-specialists. | Another advantage is that it is easy to communicate results to both peers and to non-specialists. | ||
| Line 57: | Line 46: | ||
The most prominent limitation on the use of underwater video is visibility, or rather the lack of underwater visibility. Lighting conditions, scattering [http://en.wikipedia.org/wiki/Turbidity particles] in the water, the water itself, reduce the visibility (in most practical cases) to a range of a few tens of meters, often less. Due to this (and camera resolution limitations) relatively small areas are imaged compared to for example side-scan sonar. | The most prominent limitation on the use of underwater video is visibility, or rather the lack of underwater visibility. Lighting conditions, scattering [http://en.wikipedia.org/wiki/Turbidity particles] in the water, the water itself, reduce the visibility (in most practical cases) to a range of a few tens of meters, often less. Due to this (and camera resolution limitations) relatively small areas are imaged compared to for example side-scan sonar. | ||
| − | The evaluation is obviously biased towards visual features but studies using ultraviolet light are reported | + | The evaluation is obviously biased towards visual features but studies using ultraviolet light are reported (Losey, 2003<ref name="Losey">Losey, G.S. (2003); Crypsis and communication functions of UV-visible coloration in two coral reef damselfish, Dascyllus aruanus and D.reticulatus; Animal Behaviour; 66:2, pp. 299-307</ref>) |
| − | <ref name="Losey">Losey, G.S. (2003); Crypsis and communication functions of UV-visible coloration in two coral reef damselfish, Dascyllus aruanus and D.reticulatus; Animal Behaviour; 66:2, pp. 299-307</ref> | + | , and although infrared light is rapidly attenuated in water it has reportedly been used for illumination (Hinch & Collins, 1991<ref name="Hinch">Hinch, S., Collins N. C. (1991); Importance of diurnal and nocturnal nest defence in the energy budget of male smallmouth bass: insights from direct video observations; Transactions of the American Fisheries Society 1991;120, pp. 657–663</ref>). |
| − | , and although infrared light is rapidly attenuated in water it has reportedly been used for illumination | ||
| − | <ref name="Hinch">Hinch, S., Collins N. C. (1991); Importance of diurnal and nocturnal nest | ||
| − | . | ||
The sometimes labor intensive evaluation of video material can be considered a disadvantage, and there is sometimes a risk of inter-observer biasing that should be considered and addressed if several observers are working together. | The sometimes labor intensive evaluation of video material can be considered a disadvantage, and there is sometimes a risk of inter-observer biasing that should be considered and addressed if several observers are working together. | ||
| + | <br clear=all> | ||
| + | |||
| − | == | + | ==Related articles== |
===Internal links=== | ===Internal links=== | ||
* [[Video technology]] | * [[Video technology]] | ||
* Definition of [[underwater video]] | * Definition of [[underwater video]] | ||
* Equipment of [[underwater video systems]] | * Equipment of [[underwater video systems]] | ||
| + | * [[HyMap: Hyperspectral seafloor mapping and direct bathymetry calculation in littoral zones]] | ||
===External links=== | ===External links=== | ||
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|AuthorFullName=Peter Jonsson | |AuthorFullName=Peter Jonsson | ||
|AuthorName=Pjo}} | |AuthorName=Pjo}} | ||
| − | + | [[Category:Coastal and marine observation and monitoring]] | |
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| − | [[Category:Coastal and marine | ||
Latest revision as of 12:21, 7 December 2023
This article is about the history and application of underwater video. Related articles are underwater video systems, which is about equipment of underwater video systems; and video technology, which deals with video as such. Video imaging in wells and boreholes is similar to underwater video, but puts constraints on the shape and size of the equipment, as does for example underwater video in sewer pipes, nuclear power plants or fish tanks.
Contents
History
The first attempts in the field of underwater photography were made with a pole mounted camera in the 1850s by the British William Thompson, and several successful attempts were made over the next decades. The first published scientific results from an underwater camera are from 1890 and were made by the French naturalist Louis Boutan (1893[1]) who developed underwater photography to a useful method, inventing the underwater flash and other equipment. Photographic techniques, including cinematography, were used exclusively for many years, as television at that time was at its very earliest development stage.
Underwater video has existed since the 1940s. The first published results are by Harvey Barnes in Nature (1952[2], but it is mentioned in the article that the Admiralty (UK) made successful attempts before that, and that Barnes himself started development of the method in 1948.
Applications
Since then, underwater video has been used for many purposes. The references given are not selected to be the first published results (although they may be), but only given as examples and starting points for a selected few applications.
From the start, underwater video has been used for marine biological studies (see also Figure 3). It may be abundance (Smith & Papadopoulou, 2003[3]; Moser et al, 1998[4]) behavioural studies (Grémillet et al, 2006[5]; Esteve, 2007[6]) habitat mapping (Ryan et al, 2007[7]; Abdo et al, 2004[8]) studies of fishing and trawling (Zhou & Shirley (1997[9]; Cooper and Hickey, 1987[10]) and whether the seabed is damaged or not by it (Vorbeg, 2000[11]; Linnanne et al, 2000[12]) even in combination with a water sampler (Dounas, 2006[13]) and to separate living corals from dead (Harris et al, 2004[14].)
It has also been used for marine geology (Field et al, 1981[15]), sediment studies (Osborne & Greenwood (1991)[16]), tidal microtopography (Lund-Hansen et al, 2004[17]), bridge (DeVault, 2000[18]) and pipeline (Gracias & Santos-Victor, 2000[19]) inspections, sports (Blanksby et al, 2004[20]) , marine archaeology (Coleman et al, 2000[21]), entertainment, education and more.
The reasons for this widespread use are several. The most viable alternative to underwater video for making visual observations (if you want moving pictures!) is a to be a diver or to use a waterscope. Both these methods have limitations regarding depth, observation time, temperature, accessibility, documentation procedures etc., that makes video superior in many of not most cases.
A bibliometry made in 2000 (Harvey & Mladenov, 2001[22])shows that the number of papers in the study on underwater video peaks in the mid 1990s. The reason for this is probably that before this, the equipment was expensive and bulky, and thus not very apt for underwater use. The evolution of electronics made the video equipment small (and cheap) enough for widespread use in the 1990s, and many novel applications were reported. Today, papers about video technology per se are not as numerous – not because video is not used any more, but because video is a standard method.
In spite of this, there are many misconceptions and some confusion about the technology, in particular when it comes to the evolving digital video systems. Some of these are dealt with in other Coastal Wiki articles; i.e. underwater video systems about equipment and video technology, which deals with video as such.
Pros and cons
For any mapping method there is a trade-off between resolution, coverage, labor intensity and information content (Kautsky, 2006[23]) , see figure 4, where some video methods are compared to other. You may notice that video performs well in terms of resolution and information content, not so good when it comes to workload and areal coverage.
Figure 4: Video methods compared to other methods. Modified after [23]
One obvious advantage of video is, that you can use your most capable perceptional system – the vision. What you get is what you see. As opposed to other imaging methods (for example underwater acoustics) you can see colours, shapes etc. (mostly) the way you are used to.
Figure 5: Here, the stony bottom of Öresund (the strait between Denmark and Sweden and one of the entries to the Baltic Sea) is shown as a frame from a video (right) and as an acoustic image from a Side Scan Sonar survey (left). Both representations have advantages and disadvantages and they should here be seen as complements rather than alternatives.
The cost of a simple video system is nowadays not prohibitive. It is mostly non-intrusive and non-destructive; one exception is for example the REMOTS sediment profiler, vertically slicing the sediment-water interface and viewing the sediment in profile (Rhoads, Germano and Boyer, 1981[24]). Another advantage is that it is easy to communicate results to both peers and to non-specialists.
The most prominent limitation on the use of underwater video is visibility, or rather the lack of underwater visibility. Lighting conditions, scattering particles in the water, the water itself, reduce the visibility (in most practical cases) to a range of a few tens of meters, often less. Due to this (and camera resolution limitations) relatively small areas are imaged compared to for example side-scan sonar.
The evaluation is obviously biased towards visual features but studies using ultraviolet light are reported (Losey, 2003[25]) , and although infrared light is rapidly attenuated in water it has reportedly been used for illumination (Hinch & Collins, 1991[26]).
The sometimes labor intensive evaluation of video material can be considered a disadvantage, and there is sometimes a risk of inter-observer biasing that should be considered and addressed if several observers are working together.
Related articles
Internal links
- Video technology
- Definition of underwater video
- Equipment of underwater video systems
- HyMap: Hyperspectral seafloor mapping and direct bathymetry calculation in littoral zones
External links
JNCC Joint Nature Conservation Committee (UK) Marine Monitoring Handbook (2001); in particular PG 3.5 Drop down video, PG 3.13 Subtidal hand-held video, PG 3.14 Towed sledge
References
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