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Method and apparatus for changing or mapping video or digital images from one image density to another

  • US 6,018,597 A
  • Filed: 03/21/1997
  • Issued: 01/25/2000
  • Est. Priority Date: 03/21/1997
  • Status: Expired due to Term
First Claim
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1. An apparatus for resizing a stored image, the stored image being comprised of a plurality of pixels, the apparatus comprising:

  • a convolution interpolator coupled to receive the stored image and produce a set of intermediate pixel values based on M number of pixels in the stored image; and

    a pyramid filter, coupled to the cubic convolution interpolator, for altering the intermediate pixel values to D number of pixels, wherein D is an integer not equal to M,wherein the convolution interpolator includes;

    a plurality of delay elements for sequentially storing four pixels in the M number of pixels in the stored image;

    a plurality of multiplier circuits, each multiplier circuit being coupled to one delay element;

    a plurality of memory locations for storing a plurality of coefficients;

    a multiplexing circuit coupled between the plurality of multiplier circuits and to the plurality of memory locations, wherein the multiplexing circuit sequentially couples each of the plurality of memory locations to one of the plurality of multiplier circuits, and wherein each of the plurality of multiplier circuits outputs a product signal; and

    an adder circuit coupled to the plurality of multiplier circuits and adding the product signals therefrom.

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