Patent · US Expired

Method and apparatus for processing video pictures, especially for false contour effect compensation

US6476875B2 · kind B2 · utility

18Cited by

4References

6Claims

0Family size

Assignee

Thomson Licensing · FR

Inventors

Carlos Correa · Villingen-Schwenningen, DE
Gangolf Hirtz · Niedereschach, DE
Sebastien Weitbruch · Kirchberg, DE
Didier Doyen · Savigny-le-Temple, FR
Jean-Claude Chevet · Betton, FR

Key dates

Filing date	Mar 22, 2001
Grant date	Nov 5, 2002
Priority date	—
Expiry date	Mar 22, 2021

Classification

Technology area (CPC G)Physics
CPC primaryG09G2320/106
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

With the new plasma display panel technology new kinds of artefacts can occur in video pictures. These artefacts are commonly described as “dynamic false contour effect”, since they correspond to disturbances of gray levels and colors in the form of an apparition of colored edges in the picture when the observation point on the PDP screen moves.According to the invention, such an artefact is compensated by analyzing the pictures, and determining the pixels which need to be corrected. The digital sub-field code words of these pixels are replaced by corrected sub-field code words. Thereby, the correction sub-fields (C1, C2, C3) which are inserted in or omitted from the digital code word are selected under consideration of its position within the frame period for optimal results.

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