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Eliminating routine alignment calibrations in perspective dimensional measurements

  • US 6,121,999 A
  • Filed: 06/09/1997
  • Issued: 09/19/2000
  • Est. Priority Date: 06/09/1997
  • Status: Expired due to Fees
First Claim
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1. An apparatus for determining the locations of points on an object in three dimensions, said apparatus including a camera having an optical axis, and a support means, said support means providing a substantially straight axis of translation whereby said camera can be moved from a first viewing position to a second viewing position, said camera forming images of said points in an image plane, said optical axis being so arranged with respect to said axis of translation that there are created substantial shifts of said images in said image plane when said camera is moved between said first and second viewing positions, said apparatus also including image measurement means for measuring said shifts of said images and computing means which is adapted to compute said locations of said points using said shifts said images, wherein said support means also provides an axis of rotation, whereby said camera can also be rotated about said axis of rotation for alignment with objects of interest, said axis of rotation having an orientation with respect to said axis of translation, wherein the improvement comprises:

  • (a) means for measurement of an angle of rotation of said camera about said axis of rotation; and

    (b) means for incorporating said measurement of said angle of rotation into said determination of said locations of said points.

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