Geometrical Quality Control in Nuclear Power Stations: An Application of High Precision Underwater Photogrammetry†

Przybilla, Heinz-Jürgen; Kotowski, Robert; Meid, A.; Weber, Bettina

doi:10.1111/j.1477-9730.1990.tb00718.x

Cited by 6 publications

(6 citation statements)

References 3 publications

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“…It should be noted that the approach is generic with respect to the camera viewing direction and not limited to viewing directions perpendicular to a planar glass interface (as is commonly the case in underwater photogrammetry models). The model can also be deduced from the generalized model shown in [ 9 ] with the simplifications shown here. A related approach is has been shown in [ 16 ], who very vividly connects it with the “apparent places” as known from astronomical geodesy.…”

Section: A Standard Model For Multimedia Close Range Photogrammetrmentioning

confidence: 99%

“…As an alternative, cameras may be equipped with a planar front window, which can geometrically be treated as an image invariant interface. Typical application examples are in archaeology [ 7 ], the recording of ship wrecks, marine biology [ 8 ], measurements in nuclear power stations [ 9 ] or in the measurement of the shape of fishing nets [ 10 ]. 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 planar window (e.g., 3D flow velocity measurement techniques [ 11 , 12 ]).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the Accuracy Potential in Underwater/Multimedia Photogrammetry

Maas

2015

Sensors

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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 refracted at interfaces between optical media with different refractive 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 planar glass interfaces, as it allows for some simplifications here. In the second part of the paper, several aspects, which are relevant for an assessment of the accuracy potential in underwater/multimedia photogrammetry, are discussed. These aspects include network geometry and interface planarity issues as well as effects caused by refractive index variations and dispersion and diffusion under water. All these factors contribute to a rather significant degradation of the geometric accuracy potential in underwater/multimedia photogrammetry. In practical experiments, a degradation of the quality of results by a factor two could be determined under relatively favorable conditions.

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Section: A Standard Model For Multimedia Close Range Photogrammetrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the Accuracy Potential in Underwater/Multimedia Photogrammetry

Maas

2015

Sensors

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“…Przybilla et al [4] presented all the stages involved in the procedure for the determination of the shape of a fuel assembly, which is an essential part of a nuclear power plant and can only be handled underwater. Phototriangulation was used to obtain orientation elements, taking into account light refracting surfaces.…”

Section: Photogrammetrymentioning

confidence: 99%

Rapid 3D Modelling of an Existing Building using Photos

Liu

Kang

2014

Proceedings of the International Symposium on Automation and Robotics in Construction (IAARC)

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-A three-dimensional (3D) laser scanner is one of the most well known devices when it comes to creating a 3D model of existing bridges and buildings. Most 3D scanners can pick up point clouds very accurately, which can be used to create an accurate 3D model of existing objects. One may speculate that a 3D laser scanner can also be used to pick up the status of a construction project on the job site and transform them into a 3D computer model. However, most 3D laser scanners are still expensive and they are not easy use yet especially on a congested construction site. In addition, it takes a significant amount of time to create a 3D computer model using point clouds picked up by the laser scanner. As emerging photogrammetry techniques demonstrated the use of photos instead for rapid 3D modelling, one may be wondering 1) if this technique can be used to create a 3D model of a construction site quickly, and 2) if this model is accurate enough to help project managers make some decisions. This paper presents our test demonstrating the process of creating a 3D model of an existing building using photos. It presents some challenges we faced when taking photos and creating a 3D model. This paper also presents the method we came up with to create a 3D model of the entire building without using any control points.

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“…BlueRobotics, 2018) operating in water and unmanned water vehicles (UWV;Sardemann et al, 2018) operating on the water surface available, underwater photogrammetry utilising low cost systems is becoming more prominent and is being utilised for photogrammetric mapping. The applications of underwater photogrammetry range from heritage preservations such as mapping of ship wreck sites (Balletti et al, 2015;Diamanti et al, 2017;Ktistis et al, 2017;Van Damme, 2015) and mapping of archaeological sites and objects (Bruno et al, 2015;D'Amelio et al, 2015;Denker and Oniz, 2015), to the mapping of organic environments such as underwater meadows (Rendea et al, 2015) and coral reefs (Burns andDelparte, 2017, Drap et al, 2017), and to the mapping and monitoring of engineering structures (Przybilla, 1988). However, underwater photogrammetric mapping faces a number of challenges compared to traditional in-air photogrammetry starting from lighting conditions to moving objects such as organic growth and fish in the field of view of the camera, and the introduction of location information.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Chromatic Aberrations for Gopro 3 Cameras in Underwater Environments

Helmholz

Lichti

2019

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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<p><strong>Abstract.</strong> With underwater photogrammetric mapping becoming more prominent due to the lower costs for waterproof cameras as well as lower costs for underwater platforms, the aim of this research is to investigate chromatic aberration in underwater environments. Chromatic aberration in in-air applications is to be known to systematically influence the observations of up to a few pixels. In order to achieve pixel-level positioning accuracy, this systematic influence needs further investigation. However, while chromatic aberration studies have been performed for in-air environments, there is a lack of research to quantify the influence of chromatic aberration in underwater environments. Using images captured in a water tank from three different GoPro cameras in five datasets, we investigate possible chromatic aberration by running two different adjustments on the extracted red (R), green (G) and blue (B) bands. The first adjustment is an adjustment that calculates the interior orientation parameters for each set of images independently in a free network adjustment. The second adjustment solves for all interior orientation parameters (for R, G, and B channels) in a combined adjustment per camera, constraining the point observations in object space. We were able to quantify significant chromatic aberrations in our evaluation, with the largest aberrations observed for red band followed by green and blue.</p>

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Geometrical Quality Control in Nuclear Power Stations: An Application of High Precision Underwater Photogrammetry†

Cited by 6 publications

References 3 publications

On the Accuracy Potential in Underwater/Multimedia Photogrammetry

On the Accuracy Potential in Underwater/Multimedia Photogrammetry

Rapid 3D Modelling of an Existing Building using Photos

Assessment of Chromatic Aberrations for Gopro 3 Cameras in Underwater Environments

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