Patent · US Expired

Directional adaptive noise reduction

US6049623A · kind A · utility

16Cited by

18References

12Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Miha Fuderer · Eindhoven, NL
Til Aach · Aachen, DE
Dietmar W. Kunz · Aachen, DE

Key dates

Filing date	Dec 20, 1996
Grant date	Apr 11, 2000
Priority date	—
Expiry date	Dec 20, 2016

Classification

Technology area (CPC G)Physics
CPC primaryG01R33/5608
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

An image is processed taking into account the direction of a predominant structure of the image. Said predominant direction is derived from image information in the image. In particular, the covariance matrix having matrix elements depending on products of differences between pixel-values in separate directions is calculated. The eigenvectors of the covariance matrix correspond with the predominant direction of the image structure and the eigenvalues of the covariance matrix represent the strength of the structure in the image. The covariance matrix is computed locally, i.e. for separate regions in the images so as to take variations of the direction of predominant structures into account.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.