Image processor and image processing method for image enhancement using edge detection
US7423781B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2003 |
| Grant date | Sep 9, 2008 |
| Priority date | — |
| Expiry date | Mar 24, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30176
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A filtering processing unit of an image processor includes a component extraction unit, a character edge quantity calculation unit, and a correction unit corresponding to each of a plurality of frequency bands and direction components, and an adder. The component extraction unit extracts signals from a corresponding one of the frequency bands and direction components. The character edge quantity calculation unit calculates a character edge quantity from an output of a corresponding one of the component extraction units. The correction unit performs correction control to the output of a corresponding one of the component extraction units based on a character edge quantity calculated by a corresponding one of the character edge quantity calculation units. The adder adds outputs of all the correction units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.