Apparatus for suppressing noise by adapting filter characteristics to input image signal based on characteristics of input image signal
US7386158B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 17, 2001 |
| Grant date | Jun 10, 2008 |
| Priority date | — |
| Expiry date | Dec 10, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20016
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In an apparatus for suppressing noise in an input image signal representing a radiographic image: at least one first characteristic of the input image signal is obtained by calculation based on information indicating an exposure dose with which the radiographic image has been produced; at least one second characteristic of a smoothing filter is adapted to the input image signal based on the at least one first characteristic; and the input image signal is processed by using the smoothing filter so as to smooth the radiographic image. In addition, a plurality of band-limited image signals respectively representing a plurality of band-limited images belonging to a plurality of different frequency bands are generated based on the input image signal, each of the plurality of band-limited image signals is processed by using the smoothing filter so as to smooth each of the plurality of band-limited images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.