High-pass filtering process for focusing image
US6141461A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 20, 1998 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Feb 20, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T5/20
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
High-pass filtering process for focusing images, particularly digital images, or similar, which are composed of a plurality of single dot areas, named pixels (Pi,j), having different individually variable luminous intensities I (Pi,j). The filtering process provides, for each pixel (Pi,j) a correction C (Pi,j) of the intensity value of said pixel (Pi,j), which is calculated statistically, on the basis of combinations of high-pass filterings performed in at least one, preferably in at least four different directions (0.degree., 45.degree., 90.degree., 135.degree.). According to the invention, the high-pass filter determines the correction (C,(Pr,r)) of each pixel (Pr,r; Px,x) on the basis of a mean of the intensities of at least pairs of pixels being next to, that is at predetermined distances from and on opposite sides of the filtered pixel (Pr,r; Px,x), with reference to each of the predefined directions (0.degree., 45.degree., 90.degree.,135.degree.), creating a corresponding new filtered image, composed of the corrected pixels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.