Apparatus and method for calibrating zoom lens

Details Apparatus and method for calibrating zoom lens Apparatus and method for calibrating zoom lens

2004-06-02

2008-03-25

Couso, Yon J. (Department: 2624)

Image analysis

Image enhancement or restoration

Focus measuring or adjusting

C396S087000, C348S335000

Reexamination Certificate

active

07349580

ABSTRACT:
A calibrating apparatus for a zoom lens comprising: a first image-acquiring section60for acquiring a first image-for-calibration by photographing an area, in which reference marks for calibration are positioned, with a photographic device-to-be-calibrated19whose focal length is set to a first focal length; a second image-acquiring section62for acquiring a second image-for-calibration by photographing the area, in which the reference marks for calibration are positioned, with the photographic device-to-be-calibrated19whose focal length is set to a second focal length; a correction coefficient calculating section64for calculating a calibration correction coefficient for the first and second focal lengths, with the use of the photographed reference marks in the first and second image-for-calibrations: and a reference mark inferring section66for inferring a positional relationship of the photographed reference marks for calibration in the second image-for-calibration, with the use of the photographed reference marks for calibration in the first image-for-calibration.

REFERENCES:
patent: 6618559 (2003-09-01), Hofer
patent: 2005/0007477 (2005-01-01), Ahiska
patent: 2005/0122400 (2005-06-01), Kochi et al.
patent: 9-329418 (1997-12-01), None

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