Device and method for measuring diameter of cylindrical object

摘要

Imaging a cylindrical object, left and right viewpoint images are stored to a data memory. To calculate a diameter D of the cylindrical object, a pair of measurement points designated on outlines of the left viewpoint image and corresponding points that are set on outlines of the right viewpoint image in accordance with measurement points are used. While one of the measurement points is fixed on the outline, the other measurement point is scanned on the other outline, such that the distance between the pair of measurement points is minimized. The positions of the corresponding points are updated in synchronization with this. Whenever the corresponding points are updated, the diameter D is calculated, and a minimum value of the calculated diameters is determined as the diameter D of the cylindrical object.

主权项

1. A diameter measuring device of a cylindrical object, the diameter measuring device including a computer that performs a program stored in a program memory, the diameter measuring device comprising:
a parallax image storage, in the program memory, for storing a first viewpoint image and a second viewpoint image obtained by imaging said cylindrical object from a first viewpoint and a second viewpoint, respectively; a parallax image display for displaying said first viewpoint image and said second viewpoint image; an outline detector, performed by the computer, for detecting in said first viewpoint image a first outline and a second outline of said object that are parallel to a central axis of said object; a measurement point designator, performed by the computer, for designating a first measurement point and a second measurement point on said first and second outlines, respectively; a corresponding point deriver, performed by the computer, for setting in said second viewpoint image a first corresponding point and a second corresponding point that correspond to said first and second measurement points; a measurement point updater, performed by the computer, for scanning said second measurement point on said second outline while fixing said first measurement point, and updating said second corresponding point whenever said second measurement point is updated in accordance with a scan position; and a diameter calculator, performed by the computer, for calculating a diameter of said object whenever said measurement point updater performs the update, and determining a minimum value of said calculated diameters as said diameter of said object.