Image quality improving apparatus and method using detected edges
US7746505B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 2005 |
| Grant date | Jun 29, 2010 |
| Priority date | — |
| Expiry date | Apr 19, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30176
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image quality improving apparatus and method that distinguish an edge of an actual outline imagely recognized in an image inputted via an image input unit from those printed according to dither patterns, to emphasize the actual outline, and thereby acquire the image without distortion. The image quality improving apparatus comprises: a first unit estimating edge pixels of a text area in a predetermined detection area to be edge-detected from an input picture data containing a text and an image; and a second unit judging actual edge pixels based upon a number of edge-estimated pixels in a multiple window area and saturation values of individual edge-estimated pixels, and emphasizing individual actual edge pixels with different edge emphasis coefficients according to saturation values of the actual edge pixels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.