Layer based compression of digital images
US7085422B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2002 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Aug 31, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40062
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for image separation of an image, wherein the image includes pixels, and the method includes identifying kernels, whereby characteristics of the kernels are reflected by at least one of the following operators, P(x−w,y)−P(x,y)>t AND P(x+w, y)−P(x,y)>t; or P(x, y−w)−P(x,y)>t AND P(x, y+w)−P(x,y)>t; or P(x+d, y+d)−P(x,y)>t AND P(x−d, y−d)−P(x,y)>t; or P(x−d, y+d)−P(x,y)>t AND P(x+d, y−d)−P(x,y)>t, wherein the kernels include at least some of a first group of the pixels. The kernels are associated with a first layer, and pixels that are not associated with the first layer are classified as a second layer. The first layer may be text or graphics and the second layer may be a background. The first layer may be compressed with a high resolution compression technique and the second layer may be compressed with a high lossy compression technique.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.