Machine vision methods using feedback to determine an orientation, pixel width and pixel height of a field of view

  • US 5,978,080 A
  • Filed: 09/25/1997
  • Issued: 11/02/1999
  • Est. Priority Date: 09/25/1997
  • Status: Expired due to Term
First Claim
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1. A machine vision method of determining a calibration relationship between a motion reference frame of a moveable object and an imaging reference frame of an imaging device that acquires an image of the object, the method comprising the steps of:

  • A. positioning the object so that a fiducial thereon is at a first specified position with respect to the imaging reference frame and recording a position of the object with respect to the motion reference frame, that recorded position being referred to as a first object position;

    B. positioning the object so that a fiducial thereon is at a second specified position with respect to the imaging reference frame and recording a position of the object with respect to the motion reference frame, that recorded position being referred to as a second object position;

    C. positioning the object so that a fiducial thereon is at a third specified position with respect to the imaging reference frame and recording a position of the object with respect to the motion reference frame, that recorded position being referred to as a third object position; and

    D. determining a calibration relationship between the reference frame of motion of the object and the reference frame of the camera as a function of respective motion reference frame coordinates of the first, second, and third object positions.

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