Affiliations: Dept. of Mechanical Systems Engineering, University of
Miyazaki,1-1 Gakuen-Kibanadai-Nshi, Miyazaki, 889-2192, Japan. Tel:
+81-985-58-7583/Fax: +81-985-58-7583, E-mail: kawasue@cc.miyazaki-u.ac.jp | West Japan Fluid Engineering Laboratory Co., Ltd.
339-30 kosaza, Kitamatsuura, Nagasaki, 857-0401, Japan. Tel:
+81-956-68-3500/Fax: +81-956-68-3504, E-mail: fel@felco.ne.jp
Abstract: Circular dynamic stereoscopy (CDS) has special advantages for 3-D
measurement as it uses a single CCD camera without cumbersome settings. In CDS,
annular streaks are recorded, with their size inversely proportional to the
depth/distance of the measuring point from the CCD camera. Therefore
three-dimensional information can be measured automatically by image processing
techniques. When the measuring points are relatively dense, streaks on the
image plane overlap, making automatic processing difficult. To cope with this
problem, one of the coupled mirrors is replaced by a beam splitter. The annular
streaks and their corresponding center positions are then recorded on the same
image as the displacement. The recording of the center positions helps in
resolving the overlapping annular streaks. In this paper, principle,
calibration method and application for fluid measurement is introduced.
Experimental results are presented to demonstrate the feasibility of our
method.
Keywords: 3D PTV, Image processing, Three-dimensional, Coupled mirror, Beam-splitter
