{
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  "description": "A calibrating apparatus for a zoom lens comprising: a first image-acquiring section 60 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 19 whose focal length is set to a first…",
  "path": "/patents/1081761",
  "publishedAt": "2004-12-08T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01C11/02",
    "TOPCON CORP [JP]"
  ],
  "textContent": "A calibrating apparatus for a zoom lens comprising: a first image-acquiring section 60 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 19 whose focal length is set to a first focal length; a second image-acquiring section 62 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 19 whose focal length is set to a second focal length; a correction coefficient calculating section 64 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 image-for-calibrations : and a reference mark inferring section 66 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.",
  "title": "Apparatus and method for calibrating zoom lens"
}