TY  - JOUR
A1  - Bräuer-Burchardt, Christian
A1  - Munkelt, Christoph
A1  - Bleier, Michael
A1  - Heinze, Matthias
A1  - Gebhart, Ingo
A1  - Kühmstedt, Peter
A1  - Notni, Gunther
T1  - Underwater 3D scanning system for cultural heritage documentation
JF  - Remote Sensing
N2  - Three-dimensional capturing of underwater archeological sites or sunken shipwrecks can support important documentation purposes. In this study, a novel 3D scanning system based on structured illumination is introduced, which supports cultural heritage documentation and measurement tasks in underwater environments. The newly developed system consists of two monochrome measurement cameras, a projection unit that produces aperiodic sinusoidal fringe patterns, two flashlights, a color camera, an inertial measurement unit (IMU), and an electronic control box. The opportunities and limitations of the measurement principles of the 3D scanning system are discussed and compared to other 3D recording methods such as laser scanning, ultrasound, and photogrammetry, in the context of underwater applications. Some possible operational scenarios concerning cultural heritage documentation are introduced and discussed. A report on application activities in water basins and offshore environments including measurement examples and results of the accuracy measurements is given. The study shows that the new 3D scanning system can be used for both the topographic documentation of underwater sites and to generate detailed true-scale 3D models including the texture and color information of objects that must remain under water.
KW  - underwater 3D scanning
KW  - structured light illumination
KW  - object reconstruction
KW  - 3D model generation
KW  - site mapping
Y1  - 2023
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-311116
SN  - 2072-4292
VL  - 15
IS  - 7
ER  - 
TY  - JOUR
A1  - Bräuer-Burchardt, Christian
A1  - Munkelt, Christoph
A1  - Bleier, Michael
A1  - Heinze, Matthias
A1  - Gebhart, Ingo
A1  - Kühmstedt, Peter
A1  - Notni, Gunther
T1  - A new sensor system for accurate 3D surface measurements and modeling of underwater objects
JF  - Applied Sciences
N2  - A new underwater 3D scanning device based on structured illumination and designed for continuous capture of object data in motion for deep sea inspection applications is introduced. The sensor permanently captures 3D data of the inspected surface and generates a 3D surface model in real time. Sensor velocities up to 0.7 m/s are directly compensated while capturing camera images for the 3D reconstruction pipeline. The accuracy results of static measurements of special specimens in a water basin with clear water show the high accuracy potential of the scanner in the sub-millimeter range. Measurement examples with a moving sensor show the significance of the proposed motion compensation and the ability to generate a 3D model by merging individual scans. Future application tests in offshore environments will show the practical potential of the sensor for the desired inspection tasks.
KW  - optical underwater 3D sensor
KW  - structured illumination
KW  - motion compensation
KW  - 3D model generation
KW  - high-accuracy 3D measurements
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-270792
SN  - 2076-3417
VL  - 12
IS  - 9
ER  -