Apparatus for and method of processing document image
US9294655B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2014 |
| Grant date | Mar 22, 2016 |
| Priority date | — |
| Expiry date | Dec 5, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0458
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for and a method of processing a document image are provided. The apparatus comprises: an estimation unit for estimating a brightness image from the document image; and a correction unit for correcting the brightness image by using brightness values of at least a part of edge pixels which lie on or in the adjacency of edges of the brightness image in parallel with x direction, wherein directions of neighboring two edges of the brightness image are set to be x, y directions respectively, and wherein compared with x direction, brightness values of pixels of the brightness image change relatively slightly or do not change along y direction; wherein the correction unit performs interpolation on a straight line extending along y direction by using the brightness values of the edge pixels on the straight line, thereby correcting brightness values of other pixels on the straight line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.