Investigation of a consumer-grade digital stereo camera

Menna, Fabio; Nocerino, Erica; Remondino, Fabio; Shortis, Mark R.

doi:10.1117/12.2020899

Cited by 1 publication

(2 citation statements)

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“…A system calibration is required to estimate the interior orientation plus lens distortion parameters of each camera when used both under and above the water and to estimate the relative orientation between the two cameras [15]. This procedure has been exploited for photogrammetric applications both above and underwater [15,16]. The relative orientation between two cameras viewing the same scene is the procedure of finding the five degrees of freedom of one camera relative to the other (one degree of freedom is considered known or fixed).…”

Section: Methods 2 Precalibrated Stereo Cameramentioning

confidence: 99%

“…In practice, the presence of errors in the image measurements or an inappropriate mathematical model (i.e., missing parameters to correct lens distortions) results in different relative orientations for each camera pose. Because several camera poses are generally used in a self-calibration procedure, most probable values for the relative orientation (three positions and three orientation angles of the second camera with respect to the first camera) can be obtained either through simple averaging with statistical removal of outliers (i.e., median filter) or through a more rigorous approach using relative orientation constraints in a simultaneous bundle adjustment [16,17].…”

Section: Methods 2 Precalibrated Stereo Cameramentioning

confidence: 99%

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Photogrammetry: Linking the World across the Water Surface

Nocerino

Menna

2020

JMSE

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Three-dimensional (3D) surveying and modelling of the underwater environment is challenging; however, it becomes even more arduous when the scene or asset to measure extends from above to underwater through the water surface. While this is topic of high interest for a number of different application fields (engineering, geology, archeology), few solutions are available, usually expensive and with no guarantee of obtaining homogenous accuracy and resolution in the two media. This paper focuses on a procedure to survey and link the above and the underwater worlds based on photogrammetry. The two parts of the asset, above and underwater, are separately surveyed and then linked through two possible analytical procedures: (1) independent model adjustment or (2) relative orientation constraints. In the first case, rigid pre-calibrated rods are installed across the waterline on the object to be surveyed; in the second approach, a synchronized stereo-camera rig, with a camera in water and the other above the water, is employed. The theoretical foundation for the two approaches is provided and their effectiveness is proved through two challenging case studies: (1) the 3D survey of the leak of the Costa Concordia shipwreck and (2) 3D modelling of Grotta Giusti, a complex semi-submerged cave environment in Italy.

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Section: Methods 2 Precalibrated Stereo Cameramentioning

confidence: 99%

Section: Methods 2 Precalibrated Stereo Cameramentioning

confidence: 99%