Three-Dimensional Measurement of Multiple Points Using a TV Camera with Circular Shifting Apparatus

摘要

By setting a refractor with a certain angle against the optical axis of the CCD camera lens, the image of a measuring point recorded on the image plane is displaced by the corresponding amounts related to the distance between the camera and the measuring point. When the refractor that keeps the angle against the optical axis is rotated physically at high speed during the exposure of the camera, the image of a measuring point draws a circular streak. Since the size of the circular streak is inversely proportional to the distance between the camera and the measuring point, the 3D position of the measuring point can be obtained by processing the streak.When the measuring point is moving against the camera, the measuring point draws a spiral streak on an image plane since the circular shift is added to the movement of the measuring point. The size of the spiral streak also concerns to the depth of the measuring point. The pitch of the spiral streak concerns to the velocity parallel to the image plane of the camera and the variation rate of the spiral size concerns to the velocity in the direction of the optical axis of the camera.