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CALCULATING LINEAR DIMENSIONS FROM TV IMAGES

  • US 3,773,422 A
  • Filed: 04/07/1971
  • Issued: 11/20/1973
  • Est. Priority Date: 04/07/1971
  • Status: Expired due to Term
First Claim
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1. A method of calculating the linear distance between two points on a surface of an object from a TV image thereof when the TV camera lens to object plane distance is unknown, said meThod comprising the steps of:

  • a. fixedly arranging a light source to project a beam from an emission point essentially in a plane transverse to and intersected by the two points between which the distance is to be calculated;

    b. fixedly arranging a TV camera to view the intersection of the beam and object, with the camera optical axis at an angle to the beam, and the camera scan lines parallel to the image of the beam-object intersection;

    c. measuring the distance (AB) along the camera optical axis from the lens to the point of intersection of the axis and the beam;

    d. measuring the distance (BC) from the camera lens to the emission point;

    e. measuring the distance (di) from the camera image centerline to the camera image of the intersection of the beam and object;

    f. measuring the length (Ti) of the camera image of the intersection of the beam and object between the two points; and

    g. calculating the linear distance (T) between the two points as follows;

    T Ti (AB)(BC)/di (AB) + q(BC) where q is the camera lens to image plane distance.

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