×

REMOVING ARTIFACTS FROM DOCUMENT IMAGES

  • US 20170309003A1
  • Filed: 04/26/2016
  • Published: 10/26/2017
  • Est. Priority Date: 04/26/2016
  • Status: Active Grant
First Claim
Patent Images

1. In a digital image editing environment, a method for removing artifacts from digital images, the method comprising:

  • accessing a digital image;

    calculating a shadow map for the digital image, the calculating including;

    clustering pixel intensities of multiple blocks of the digital image into two or more clusters;

    determining local background colors for each of the multiple blocks of the digital image based on the two or more clusters of each of the multiple blocks;

    clustering pixel intensities representing the entire digital image into two or more clusters;

    determining global background colors for the digital image based on the two or more clusters representing the entire digital image;

    assigning a background color of the digital image as a global reference background color based at least in part on the determined global background colors; and

    generating a per-pixel scaling factor to normalize the local background colors by the global reference background color, the per-pixel scaling factor mapping the local background colors of the digital image to the global reference background color; and

    applying localized adjustment to pixels of the digital image to remove artifacts from the digital image using the per-pixel scaling factor.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×