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Apparatus and method for processing digital images

  • US 4,825,388 A
  • Filed: 04/01/1986
  • Issued: 04/25/1989
  • Est. Priority Date: 04/01/1986
  • Status: Expired due to Fees
First Claim
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1. An improved computer graphics digital image comparison apparatus for processing and comparing at least two digitally stored images provided from a host computer and displaying on a raster-scan display means, a visible image of the result of said comparison, the apparatus comprising:

  • (a) at least two image memory refresh buffer means for digitally storing said images in respective pixel matrices, each said matrix having at least two bits per pixel;

    (b) zoom and roam logic means for each of said image memory refresh buffer means for independently providing on said raster-scan display means, apparent magnification of a region of each digitally stored image, said apparent magnification including the selection of a pixel in each of said image memory refresh buffer means, which corresponds to a specific pixel correlated with said images being displayed on said raster-scan display means, said region having a selected size and position within the image memory refresh buffer means;

    (c) lookup table means for each of said image memory refresh buffer means, each said lookup table means independently transforming into a programmed pixel value, each said pixel stored in said image memory refresh buffer means, and selected by the zoom and roam logic means;

    (d) function processing logic means for processing said programmed pixel values from all of said lookup table means and generating new programmed pixel values;

    (e) digital-to-analog conversion means for converting said new programmed pixel values generated by said function processing logic means, into an analog signal; and

    ,(f) raster-scan display means for using said analog signal to produce a visible image.

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