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3D blog:
note to the engineer
note to the engineer
3D scanning using photogrammetry
Photogrammetry is a technology that allows you to determine the spatial coordinates of an object's points by measuring several photographs taken from different angles. The preparation and execution of photogrammetric projects does not take much time and significantly saves time when scanning, especially large objects.
The reference point cloud created at the stage of the photo project execution makes it possible to minimize the volumetric error during 3D scanning. In addition, it becomes possible to accurately and quickly scan areas of an object that are very far from each other without collecting all the surfaces between them.
Photogrammetry can be applied autonomously, as a non-contact measuring machine. In this case, you can make the necessary measurements using the marker points.
Let’s consider a combined scan using a RangeVision PRO 3D scanner using the example of an internal combustion engine (approximately 1000×1000×500 mm in size). Before starting work, it is necessary to prepare both the object itself and the space around it: the object must be positioned so that all surfaces to be scanned are available for digitization by both a photogrammetry system and a 3D scanner. Surfaces of an object that are difficult to read with a scanner (such as dark, glare, or soaked in oil) must be cleaned and treated with a matting spray. Technological markers used for positioning should also be applied to the object.
The photogrammetric process boils down to applying code markers, installing scale rulers, and then photographing the object from various angles.
Photogrammetry can be applied autonomously, as a non-contact measuring machine. In this case, you can make the necessary measurements using the marker points.
Let’s consider a combined scan using a RangeVision PRO 3D scanner using the example of an internal combustion engine (approximately 1000×1000×500 mm in size). Before starting work, it is necessary to prepare both the object itself and the space around it: the object must be positioned so that all surfaces to be scanned are available for digitization by both a photogrammetry system and a 3D scanner. Surfaces of an object that are difficult to read with a scanner (such as dark, glare, or soaked in oil) must be cleaned and treated with a matting spray. Technological markers used for positioning should also be applied to the object.
The photogrammetric process boils down to applying code markers, installing scale rulers, and then photographing the object from various angles.
The final result of the photo project is a reference point cloud, which is exported to the RV 3D Studio program (until 2023 — ScanCenter), for subsequent scanning. RV 3D Studio is RangeVision 3D scanner software for scanning and working with the results, it allows you to upload files of reference networks in formats. basegrid and .obc, as well as in specially prepared .txt files.
The exported reference grid allows you to start scanning from any area. The 3D scanner will determine its position relative to the object based on the location of a combination of points in its field of view, and all frames will be positioned automatically in a single coordinate system. Due to this, large frame overlaps are not required during scanning, and the operator performing digitization can observe the result of 3D data collection in real time.
In order to fully digitize an object, it is necessary to scan its surfaces from different angles, gradually moving the 3D scanner. At the same time, the operator can ignore unnecessary areas and work only with those that are of interest to the project. Photogrammetry systems can significantly reduce the time spent on scanning an object.
After performing automatic scanning data processing, the operator receives a file with information about the engine surfaces in stl format.
Thus, RangeVision 3D scanners can be successfully used in conjunction with photogrammetric systems to solve complex, complex tasks and scan large objects.
After performing automatic scanning data processing, the operator receives a file with information about the engine surfaces in stl format.
Thus, RangeVision 3D scanners can be successfully used in conjunction with photogrammetric systems to solve complex, complex tasks and scan large objects.