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System for the display of images in half tones on a matrix screen

  • US 5,053,764 A
  • Filed: 10/03/1988
  • Issued: 10/01/1991
  • Est. Priority Date: 10/09/1987
  • Status: Expired due to Fees
First Claim
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1. A system for the display of images in half tones on a matrix screen, comprising the following steps:

  • preparing luminance information for each pixel of one of the images according to a corresponding N-bit word, N being greater than or equal to 2;

    storing the luminance information in N memory planes with respect to the N-bit word;

    addressing the memory planes to produce, through a sequential reading of these planes, N successive displayed images wherein any grouping of N adjacent pixels is obtained by successively extracting, for a given pixel of said grouping, one luminance bit from one of the memory planes different from those already used for said given pixel when forming the preceding images so as to extract the N bits of the luminance word corresponding to said given pixel, said addressing step extracting, in a given image of said N successive displayed images, for each of the pixels of any considered one of said groupings, one luminance bit in a different memory plane from those used for the other pixels of said considered grouping, thereby obtaining for each pixel, in the course of N successive scans of images, N-1intermediate values in addition to the luminance values black and white corresponding to binary values "0" and "1" respectively, said N-1 intermediate values corresponding to half-tones.

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