研究目的
Investigating the novel method for digitalisation of test fields by laser scanning for camera calibration.
研究成果
The presented method for digitalising test fields using laser scanning is as precise as tacheometric measurements but significantly faster. It offers a versatile and error-proof approach with high statistical stability. Future developments in laser scanning technology are expected to further improve the method's accuracy and applicability.
研究不足
The position accuracy is currently limited to ≤ 50 μm (MPE) by the laser scanner used. The method requires further development to increase accuracy and reduce costs.
1:Experimental Design and Method Selection:
The method involves using a hand-held laser scanner and laser tracker combination to measure photogrammetric test fields. The approach relies on image processing of quasi-continuous measurements.
2:Sample Selection and Data Sources:
The test field consists of 91 targets from Trimble Geospatial—INPHO GmbH, fixed on non-warping laminated fiber sheets.
3:List of Experimental Equipment and Materials:
Leica Absolute Tracker AT 960 with T-Scan 5, Hasselblad H4D-40 camera, and PolyWorks software for data processing.
4:Experimental Procedures and Operational Workflow:
The test field is scanned using the laser tracker and scanner combination. The 3D point cloud is processed to extract control point coordinates. Photogrammetric images are acquired and used in a bundle adjustment for final 3D coordinates.
5:Data Analysis Methods:
The data is analyzed using PolyWorks for meshing and extracting coordinates, and a bundle adjustment is performed for parameter estimation.
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