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Image display with movable magnification

  • US 4,800,379 A
  • Filed: 04/30/1987
  • Issued: 01/24/1989
  • Est. Priority Date: 05/12/1986
  • Status: Expired due to Term
First Claim
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1. A method of displaying an image on a monitor, said image being defined by digital data representing the colour content of pixels of said image, said method comprising:

  • (1) causing said monitor to display said image under the control of said digital data;

    (2) moving an image area selecting outline through ones of a plurality of positions on said displayed image, the size of said outline being smaller than said displayed image;

    (3) determining, for each position of said outline, subsidiary digital data defining a portion of said image within said outline after magnification and corresponding to said position; and

    (4) causing said monitor to display said magnified portion within said outline, pixels of the originally displayed image within the remaining portion of said outline being suppressed, such that said magnified portion substantially fills said outline, while the remainder of said image outside said outline is displayed unchanged.

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