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Pictorial information processing technique

  • US 4,454,593 A
  • Filed: 05/19/1981
  • Issued: 06/12/1984
  • Est. Priority Date: 05/19/1981
  • Status: Expired due to Term
First Claim
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1. A method for displaying a picture on a display device comprising the steps of:

  • defining said picture in terms of a unit screen coordinate space comprising a plurality of generally rectangular logical picture elements (pels) having a predefined width dx and a predefined height dy, each of said pels having an associated N-bit code word indicating its visual attributes;

    mapping the location of a first one of said logical pels from said unit screen coordinate space to a corresponding location in a display memory which includes an array of discrete storage locations arranged in a plurality of rows and columns;

    writing the N-bit code word associated with said first logical pel in storage locations identified in said mapping step;

    repeating said mapping and writing steps for each of said logical pels defining said picture; and

    sequentially applying the contents of said display memory to a display device,wherein said defining step includes;

    generating a series of samples each representing the attributes of a particular element of said picture, said elements lying along a plurality of generally parallel raster scan lines;

    converting each of said samples to an N-bit digital word;

    sequentially assembling each of said words in the M-bit active portions of a stream of bytes, where M and N need not be interger multiples;

    encoding an indication of the value of N; and

    encoding the values of said predefined width dx and said prefined height dy as signed numbers which indicate;

    (1) the direction in which said picture is scanned, and (2) the values of said width dx and height dy as a fraction of said unit screen coordinate space, such that said picture is entirely displayed as long as dx=1/P and dy=1/L, where P is the number of said samples on each of said scan lines and L is the number of lines scanned.

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