Systems and methods for content-based document image enhancement
US7079686B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2002 |
| Grant date | Jul 18, 2006 |
| Priority date | — |
| Expiry date | Feb 24, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30176
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system can include a system processor that is programmed or adapted to classify pixels in a document image, and in some instances, to enhance the document image based upon such classification. Image data including pixels is received. For each pixel in some subset of the image data, a feature vector is generated. Each pixel in the subset is classified as text or image based upon its associated feature vector. The classifications can be outputted for storage and/or further processing. Further processing can include pixel level enhancement processing. Such enhancement processing can include application of a sharpening filter to pixels classified as text and of a smoothing filter to pixels classified as image. In some instances, background suppression can be performed upon a subset of the image data prior to classification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.