Method for space-time filtering of noise in radiography
US7379615B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 2003 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | Oct 22, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20182
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
To reduce the fluoroscopic noise in an image I acquired at a date t, the pixels of this image are paired with the pixels of an image I′ acquired at a date t−1. For a pixel with coordinates (x,y) of the image I, a convolution is done with a core U equivalent to a low-pass filter whose coefficients have been modified as a function of the neighborhood of the pixel with coordinates (x,y) in the image I. For the pixel paired in the image I′, a convolution is done with the core U whose coefficients have been modified as a function of the neighborhood of the pixel with coordinates (x,y) in the image I′. The result of the two convolutions is associated linearly in order to obtain a filtered value for the pixel with coordinates (x,y). These operations are repeated for each pixel of the image I.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.