×

System and method for automatic page registration and automatic zone detection during forms processing

  • US 5,822,454 A
  • Filed: 04/10/1995
  • Issued: 10/13/1998
  • Est. Priority Date: 04/10/1995
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for automatically extracting information from a plurality of user defined zones in a second image corresponding to a plurality of user defined zones in a first image and compensating for skew and displacement in the second image with respect to the first image, comprising the steps of:

  • receiving a user input defining at least one user defined zone in relationship to the first image, each user defined zone for extracting information from a portion of a second image corresponding to the user defined zone in the first image;

    smoothing the first image to produce blocks of connected pixels;

    identifying in the first image a first plurality of blocks from the blocks of connected pixels;

    defining at least one first set of vectors among selected ones of the first plurality of blocks, wherein a first vector between any two of the first plurality of blocks describes a skew and displacement invariant relationship between the two blocks;

    identifying in the second image a second plurality of blocks of connected pixels;

    defining at least one second set of vectors among selected ones of the second plurality of blocks wherein a second vector between any two of the second plurality of blocks describes a skew and displacement invariant relationship between the two blocks;

    comparing the at least one first set of vectors to the at least one second set of vectors to determine a percentage of the first set of vectors that are similar to the second set of vectors; and

    ,responsive to the percentage being greater than a predetermined threshold, extracting information only from portions of the second image that correspond to each of the user defined zones of the first image.

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