A Review Of Underwater Stereo-image Measurement For Marine Biology And Ecology Applications

Shortis, Mark R.; Harvey, Euan S.; Abdo, Dave

doi:10.1201/9781420094220.ch6

Cited by 84 publications

(84 citation statements)

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“…In Table 1, a comparison between the pros and cons of using video recording and diver observation is given. An overview of underwater camera systems for monitoring this kind of environments is given in [33]. Different camera setups are used for fish observations: cameras with and without bait [45], different kind of bait [9], stereo vision [7] and high-resolution rotating cameras [27].…”

Section: Diver Observations Video Recordingmentioning

confidence: 99%

A research tool for long-term and continuous analysis of fish assemblage in coral-reefs using underwater camera footage

Boom

Palazzo

et al. 2014

Ecological Informatics

121

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We present a research tool that supports marine ecologists' research by allowing analysis of long-term and continuous fish monitoring video content. The analysis can be used for instance to discover ecological phenomena such as changes in fish abundance and species composition over time and area. Two characteristics set our system apart from traditional ecological data collecting and processing methods. First, the continuous video recording results in enormous data volumes of monitoring data. Currently around a year of video recordings (containing over the 4 million fish observations) have been processed. Second, different from traditional manual recording and analysing the ecological data, the whole recording, analysing and presentation of results is automated in this system. On one hand, it saves the effort of manually examining every video, which is infeasible. On the other hand, no automatic video analysis method is perfect, so the user interface provides marine ecologists with multiple options to verify the data. Marine ecologists can examine the underlying videos, check results of automatic video analysis at different certainty levels computed by our system, and compare results generated by multiple versions of automatic video analysis software to verify the data in our system. This research tool enables marine ecologists for the first time to analyse long-term and continuous underwater video records.

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Section: Diver Observations Video Recordingmentioning

confidence: 99%

A research tool for long-term and continuous analysis of fish assemblage in coral-reefs using underwater camera footage

Boom

Palazzo

et al. 2014

Ecological Informatics

121

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“…Ewing et al 1967, Torlegård & Lundalv 1974, Corliss et al 1979, Gutt et al 1996, Clarke 2003, Bailey et al 2007, Lirman et al 2007, Bowen et al 2009, Shortis et al 2009). This includes the use of manual image equipment (digital still and video cameras) operated by SCUBA divers and remote imaging technology in deep waters, such as remotely operated vehicles (ROVs), autonomous underwater vehicles (AUVs), landers equipped with cameras for long-term observations and a variety of other still camera systems.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical segmentation-based software for cover classification analyses of seabed images (Seascape)

Teixidó¹,

Albajes‐Eizagirre²,

Bolbo³

et al. 2011

Mar. Ecol. Prog. Ser.

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An important aspect of marine research is to quantify the areal coverage of benthic communities. It is technically feasible to efficiently obtain images of marine environments at different depths and benthic habitats over large spatial and temporal scales. Currently, there is a large and growing library of digital images to analyze, representing a valuable benthic ecological archive. Benthic coverage is the basis of studies on biodiversity, characterization of communities and evaluation of changes over temporal and spatial scales. However, there is still a lack of automatic or semi-automatic analytical methods for deriving ecologically relevant data from these images. We introduce a software program named Seascape to obtain semi-automatically segmented images (patch outlines) from underwater photographs of benthic communities, where each individual patch (species/categories) is routinely associated to its area cover and perimeter. Seascape is an analog to the classical and better known discipline of landscape ecology approach, which focuses on the concept that communities can be observed as a patch mosaic at any scale. The process starts with a hierarchical segmentation, using a color space criteria adapted to the problem of segmenting complex benthic images. As an endproduct, we obtain a set of images segmented into classified homogenous regions at different resolution levels (hierarchical segmentation). To illustrate the versatility and capacity of Seascape, we analyzed 4 digital images from different habitats and depths: coral reefs (Pacific Ocean), coralligenous communities (NW Mediterranean Sea), deep-water coral reefs (NW Mediterranean Sea) and the Antarctic continental shelf (Weddell Sea). The development of this semi-automatic outline tool and its use for classification constitute an important step forward in the analysis and processing time of underwater seabed images at any scale.

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“…As an alternative, cameras may be equipped with a plane parallel front window, which can geometrically be treated as an image invariant interface. Typical application examples are in archaeology (Drap et al, 2002), in the recording of ship wrecks, in marine biology (Shortis et al, 2009), in measurements in nuclear power stations (Przybilla et al, 1988) or in the measurement of the shape of fishing nets (Zwart, 1987).  Many applications in industrial/technical close range photogrammetry deal with objects or processes in liquids, which are observed by cameras situated outside the observation vessel, imaging the scene through a plane parallel glass window (e.g.…”

Section: Introductionmentioning

confidence: 99%

A Modular Geometric Model for Underwater Photogrammetry

Maas

2015

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Underwater applications of photogrammetric measurement techniques usually need to deal with multimedia photogrammetry aspects, which are characterized by the necessity of handling optical rays that are broken at interfaces between optical media with different refrative indices according to Snell's Law. This so-called multimedia geometry has to be incorporated into geometric models in order to achieve correct measurement results.The paper shows a flexible yet strict geometric model for the handling of refraction effects on the optical path, which can be implemented as a module into photogrammetric standard tools such as spatial resection, spatial intersection, bundle adjustment or epipolar line computation. The module is especially well suited for applications, where an object in water is observed by cameras in air through one or more plane parallel glass interfaces, as it allows for some simplifications here.

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A Review Of Underwater Stereo-image Measurement For Marine Biology And Ecology Applications

Cited by 84 publications

References 0 publications

A research tool for long-term and continuous analysis of fish assemblage in coral-reefs using underwater camera footage

A research tool for long-term and continuous analysis of fish assemblage in coral-reefs using underwater camera footage

Hierarchical segmentation-based software for cover classification analyses of seabed images (Seascape)

A Modular Geometric Model for Underwater Photogrammetry

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