A digital photogrammetry measurement system (XJTUDP) is developed in this work, based on close range industry. Studies are carried out on key technologies of a photogrammetry measurement system, such as the high accuracy measurement method of a marker point center based on a fitting subpixel edge, coded point design and coded point autodetection, calibration of a digital camera, and automatic image point matching algorithms. The 3-D coordinates of object points are reconstructed using colinear equations, image orientation based on coplanarity equations, direct linear transformation solution, outer polar-line constraints, 3-D reconstruction, and a bundle adjustment solution. Through the use of circular coded points, the newly developed measurement system first locates the positions of the camera automatically. Matching and reconstruction of the uncoded points are resolved using the outer polar-line geometry of multiple positions of the camera. The normal vector of the marker points is used to eliminate the error caused by the thickness of the marker points. XJTUDP and TRITOP systems are tested on the basis of VDI/VDE2634 guidelines, respectively. Results show that their precision is less than 0.1 mm/m. The measurement results of a large-scale waterwheel blade by XJTUDP show that this photogrammetry system can be applied to industrial measurements.
In order to meet the requirement of obtaining the object figure quickly and accurately, XJTUDP software has been
developed successfully by oneself based on photogrammetry theory. The contents of composing and explored of this
system are introduced in this paper. The VDI/VDE2634 testing program is taken as referenced project, the self-designed
framework of cube is taken as tested target, and then the conclusion that precision of XJTUDP may meet the standard of
industrial measurement has been reached out. Finally, large-scale waterwheel leave is taken as example to conduct
measuring, it is proved that photogrammetry system explored by ourselves may be imposed applying on the field of
industrial measuring successfully.
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