Television – Camera – system and detail – Optics
Reexamination Certificate
2008-03-11
2008-03-11
Villecco, John M. (Department: 2622)
Television
Camera, system and detail
Optics
C348S087000, C348S135000, C250S201700, C250S559190, C356S609000
Reexamination Certificate
active
10873122
ABSTRACT:
Focus detecting methods and focus detecting mechanisms of an image measuring device able to execute focus detection at high speed with high accuracy, and image measuring device having the focus detecting mechanisms are provided. A rotation driving device rotates and operates a grating filter for projecting a grating pattern to a measured object. A distance driving device adjusts the interval distance between an image pickup device and the measured object. The image of the measured object projecting the grating pattern thereto every predetermined rotating angle is picked up by the image pickup device via multiple exposure by operating the rotation driving device and the distance driving device in association with each other. A focus position is determined from a contrast value of the grating pattern within the picked-up image information. Accordingly, it is not necessary to pick-up plural images in plural distance positions and process the plural images. Therefore, times taken in the image picking-up and the image processing can be shortened and a focus detecting speed can be increased. Further, the focus detection can be performed with high accuracy since the contrast value is determined on the basis of frequency area information.
REFERENCES:
patent: 3290124 (1966-12-01), Holtzclaw, Jr.
patent: 4027134 (1977-05-01), Arakawa et al.
patent: 4829374 (1989-05-01), Miyamoto et al.
patent: 5404163 (1995-04-01), Kubo
patent: 5604344 (1997-02-01), Finarov
patent: 6075558 (2000-06-01), Tachibana et al.
patent: 6490541 (2002-12-01), Ariga et al.
patent: 7133078 (2006-11-01), Nagasawa
patent: 7177033 (2007-02-01), Yoshida
patent: 2002/0191503 (2002-12-01), Kataoka et al.
patent: 2003/0169431 (2003-09-01), Moriuchi et al.
patent: 2005/0109959 (2005-05-01), Wasserman et al.
patent: 1 271 095 (2003-01-01), None
patent: 09304685 (1997-11-01), None
patent: 2001027517 (2001-01-01), None
Mitutoyo Corporation
Oliff & Berridg,e PLC
Villecco John M.
LandOfFree
Focus detecting method, focus detecting mechanism and image... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Focus detecting method, focus detecting mechanism and image..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus detecting method, focus detecting mechanism and image... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3955906