×

Data compression method for graphics images

  • US 4,546,385 A
  • Filed: 06/30/1983
  • Issued: 10/08/1985
  • Est. Priority Date: 06/30/1983
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for compressing data representing a graphics image encoded in binary form having at least first and second bit planes respectively containing a most significant bit and at least significant bit for each pixel in the image indicating whether the pixel has an extreme intensity value or one of two intermediate intensity values, comprising the steps of:

  • identifying edge pixels from the change in value of the binary state of successive bits in said first bit plane of said image;

    generating at least a single binary bit for each adjacent edge pixel so identified;

    comparing the bits in the first and second bit planes for each of said edge pixels to determine the binary state of each of said binary bits generated, for indicating by said state whether each edge pixel has an extreme intensity value or an intermediate intensity value; and

    replacing said second bit plane with said indicative binary bits to compress the image data.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×