Yun-lei LI, Xi ZHANG. Probe-based multi-view field 3D vision measurement system based on three-dimensional orientation target[J]. Optics and precision engineering, 2019, 27(1): 34-44.
DOI:
Yun-lei LI, Xi ZHANG. Probe-based multi-view field 3D vision measurement system based on three-dimensional orientation target[J]. Optics and precision engineering, 2019, 27(1): 34-44. DOI: 10.3788/OPE.20192701.0034.
Probe-based multi-view field 3D vision measurement system based on three-dimensional orientation target
To meet the shape measurement of a polyhedral or rotary body
whose surface includes shadowed areas
deep holes
or grooves
a probe Multi-View Field (MVF) 3D vision measurement system based on 3D orientation target was proposed. We introduce the structure and principle of the vision measurement system. First
based on close range photogrammetry
six element models of the orientation target were built and the local coordinates of the corners in each model were obtained. Based on the above results
stitching six element models and bundle adjustments were further used to calculate the precise global coordinates of all corners. Next
a probe with assistant locating coplanar corners was designed and close range photogrammetry technology was used to compute the precise coordinates of the coplanar corners and probe head in the probe coordinate system. Finally
using the homography matrix between the coplanar chessboard corners and its image plane
the position and orientation between the global or probe coordinate system and camera were derived
respectively
by which the global coordinates of the probe head were determined. Taking the standard length of the gauge block and length bar as the evaluation index
accuracy better than 0.1 mm was achieved in a field of 2 m × 1.5 m. The real experiment to measure 3D data was performed on a kettle
whose shape has the characteristics of a rotating body
and the results demonstrate that the MVF 3D vision measurement system can acquire point clouds in all areas of the kettle surface.
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