Title:
【発明の名称】合焦検出方法、これを用いた非接触変位測定方法及び装置
Document Type and Number:
Japanese Patent JP2696044
Kind Code:
B2
Abstract:
An image of the surface of a measuring object is picked up by a video camera while the distance to the measuring object is changed, and the in-focus state of the video camera is detected from the fact that the contrast, which is defined by the sum of the n-th (n: integer greater than 1) power of differences in brightness between adjoining pixels in the image, has reached its maximum. Further, the position of the surface of the measuring object is measured according to the position of the video camera in the in-focus state.
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Inventors:
Kubo Kazutoshi
Application Number:
JP18662292A
Publication Date:
January 14, 1998
Filing Date:
July 14, 1992
Export Citation:
Assignee:
Mitutoyo Corporation
International Classes:
G01B11/00; G01C3/06; H04N5/232; H04N7/18; (IPC1-7): G01C3/06; G01B11/00; H04N5/232
Domestic Patent References:
| JP2150705A | ||||
| JP62261907A |
Attorney, Agent or Firm:
Satoshi Takaya (2 outside)