Patent ID: 7349580
Filing Date: 2008-03-25
Classification: G01C

Abstract:
1. A calibrating apparatus for a zoom lens, comprising: a first image-acquiring section for acquiring a first image-for-calibration by photographing an area, in which reference marks for calibration are positioned, with a photographic device-to-be-calibrated whose focal length is set to a first focal length; a second image-acquiring section for 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-calibrated whose focal length is set to a second focal length; a correction coefficient calculating section for 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 images-for-calibration; and a reference mark inferring section for 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.