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Method and apparatus for displaying a high resolution image on a low resolution CRT

  • US 4,924,522 A
  • Filed: 05/11/1989
  • Issued: 05/08/1990
  • Est. Priority Date: 08/26/1987
  • Status: Expired due to Term
First Claim
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1. In a system in which image data for an image is provided in the form of a matrix of binary pixels of a first predetermined resolution, the method of displaying said image data onto a CRT having a resolution lower than said first predetermined resolution, comprising the steps:

  • (a) selecting a block of four of said pixels which represents a predetermined area of said image data;

    (b) examining only the status of each pixel in said predetermined area to determine whether it is a binary one or a binary zero;

    (c) assigning a predetermined value ranging from zero through three for the various combinations of binary ones and binary zeros which exist in said block of four pixels in said predetermined area, with said predetermined value representing said block of four pixels;

    (d) using a said predetermined value to control a gray scale value ranging from completely white to completely black for displaying on said CRT said gray scale value as representing solely said predetermined area of said image, said displaying being effected on said CRT at a resolution which is lower than said first predetermined resolution;

    (e) selecting in a predetermined order or examining pattern an adjacent and completely new block of four pixels which represents said predetermined area for said image; and

    (f) repeating steps b, c, and d for said adjacent predetermined area and the remaining predetermined areas for the entire said image until the entire image is completely displayed.

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