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Imaging system transfer function control method and apparatus

  • US 5,621,519 A
  • Filed: 07/31/1995
  • Issued: 04/15/1997
  • Est. Priority Date: 07/31/1995
  • Status: Expired due to Term
First Claim
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1. A method to measure a system transfer function of an imaging system having an input and an image sampler with a discrete image output wherein the discrete image output can be represented by a frequency representation with aliased components and unaliased components, the method comprising the steps of:

  • (a) providing an image primitive to the input, the image primitive comprising a substantially uniaxial pattern having a predetermined frequency representation, the image primitive being oriented at a predetermined angle relative to the image sampler wherein the predetermined angle is chosen to separate the aliased components from the unaliased components;

    (b) obtaining a discrete image of the image primitive with the imaging system;

    (c) computing a two-dimensional frequency representation of the discrete image;

    (d) selecting a region of the two-dimensional frequency representation; and

    (e) comparing the region to the predetermined frequency representation to compute the system transfer function.

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