Image analysis – Image enhancement or restoration – Image filter
Patent
1998-02-20
2000-10-31
Rogers, Scott
Image analysis
Image enhancement or restoration
Image filter
382263, G06T 500
Patent
active
061414611
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.
REFERENCES:
patent: 4731865 (1988-03-01), Sievenpiper
patent: 5070465 (1991-12-01), Kato et al.
patent: 5390264 (1995-02-01), Ishihara et al.
A Fast Filtering Algorithm for Image Enhancement; 557-564; 1994.
Esaote S.p.A.
Rogers Scott
LandOfFree
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