Method of and device for image enhancement
US7746503B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 11, 2005 |
| Grant date | Jun 29, 2010 |
| Priority date | — |
| Expiry date | Mar 1, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30176
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of enhancing an image comprises determining whether brightness values have changed in an output screen of documents that include a text and an image, with respect to a pixel located in a predetermined edge detection region; calculating binarization data values based on each pixel brightness values of a plurality of windows that are formed by applying different samplings to the detected region, when the brightness values are changed in excess of a predetermined threshold Tha, and determining a connectivity of the calculated binarization data values with respect to each of a plurality of windows; estimating the pixel to be edge pixel when the binarization data values have a connectivity; and determining finally the estimated pixel to be an edge pixel when a number of pixels estimated as an edge is in excess of a predetermined fixed value THd, and if not, determining the estimated edge pixel as not being an edge pixel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.