Three-Dimensional Measurement Using Circular Velocity Bias : Automatic Extraction of Circular Streaks
Kikuhito Kawasue, Yuichiro Ohya, Takakazu Ishimatsu · TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C · 2001
A three-dimensional measuring system that uses a single TV camera is introduced. By introducing a refractor on the TV camera lens, measuring points, which appear on the image plane, are displaced according to the depth. By rotating the refractor at high speed during the TV camera exposure, these measuring points are shifted and appearted to be circular streaks on an image plane. Since the size of a circular streak is inversely proportional to the depth from the TV camera, the depth can be measured easily by processing the circular image. In the case that the measuring points are dence, streaks on the image plane would be overlapped each other. By generating the lines in the direction of edge normal against the edge of circular steaks, each streak could be extracted from the overlapped images automatically. In this paper, the experimental results of shape measurement of objects and flow measurement are introduced.