Method of removing noise from image signal
US6667766B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2001 |
| Grant date | Dec 23, 2003 |
| Priority date | — |
| Expiry date | Dec 14, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/68
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In order to provide a noise removal method for removing noise signals mixed into an image signal without deteriorating picture quality of the overall image, such zigzag noise signals that the difference between the output levels of two pixels adjacent to each other along a noise generation direction alternately takes positive and negative vales at least three times are detected from noise signals mixed into an image signal. Then, a specific pixel is noted among a plurality of pixels corresponding to the noise signals, for calculating a mean value of the output levels of the noise signals with reference to the specific pixel and correcting the output level of a noise signal corresponding to the said specific pixel with the said mean value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.