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Method and apparatus for scanning an object

  • US 5,043,924 A
  • Filed: 09/22/1988
  • Issued: 08/27/1991
  • Est. Priority Date: 09/22/1987
  • Status: Expired due to Fees
First Claim
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1. A method for producing an image of the surface of an object, comprising the steps:

  • a) flying over the object while periodically scanning the object in a plurality of scanning sweeps in a scanning direction transversely to the flying direction with a scanner comprising a row of individual equal-sized detectors oriented transversely to the direction of scanning,b) during each scanning sweep the output signal of each individual detector is scanned in a plurality of short scanning periods Δ

    t each corresponding to a small incremental angle of the object for generating a sequence of fundamental detector signals, whereby the fundamental detector signals become associated with respective fundamental object pixels each of whose width is perpendicular to the said scanning direction and each of whose size is a function of the distance range of the object pixel from the scanner,c) storing the fundamental detector signals of all individual detectors of the row for each scanning sweep,d) combining the stored fundamental detector signals to form therefrom an image of the object composed of a grid of standard object pixels (B) having the same size independently of their distance range from the scanner and such that during each scanning sweep a strip (j) corresponding to the surface of the object is formed, each said strip, in its width and length, being respectively composed of a constant quantity of standard object pixels.

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