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Full page graphics image display data reduction

  • US 4,896,275 A
  • Filed: 07/10/1987
  • Issued: 01/23/1990
  • Est. Priority Date: 07/10/1987
  • Status: Expired due to Term
First Claim
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1. A method of transferring a binary graphics or picture image stored in a random access memory (RAM) to an output device having less than a page of buffer memory, said image including a plurality of scan lines of dots or pixels, said method comprising the steps of:

  • (a) scanning a row segment of said binary image at a time starting from a predetermined reference point in said memory, said row segment consisting of a predetermined plurality of scan lines of dots;

    (b) analyzing a predetermined increment of said row segment at a time in said memory for the presence of dot patterns containing essential data so as to divide said row segment into a number of increment long cell matrices;

    (c) generating position information signals for bit map representations containing said essential data patterns defined in step (b), each of said bit map representations having a vertical or height dimension equal to said predetermined plurality of scan lines and a horizontal or length dimension equal to a number of consecutive cell matrices detected as containing said essential data;

    (d) successively transferring to said output device, said position information signals followed by each of said bit map representations in said memory containing areas of said image to be reproduced; and

    ,(e) repeating steps (a) through (d) for each row segment until said image has been processed.

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