Method for processing video pictures for display on a display device and apparatus for carrying out the method

US6717558B1 · kind B1 · utility

Assignee

• Thomson Licensing · FR

Inventors

• Sebastien Weitbruch · Kirchberg, DE
• Carlos Correa · Villingen-Schwenningen, DE
• Rainer Zwing · Villingen-Schwenningen, DE
• Didier Doyen · Savigny-le-Temple, FR

Key dates

• Filing date: Apr 18, 2000
• Grant date: Apr 6, 2004
• Expiry date: Apr 18, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G09G2320/103
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

With the new plasma display panel technology new kinds of artifacts can occur in video pictures due to the principle that brightness control is done with a modulation of small lighting pulses in a number of periods called sub-fields. These artifacts are commonly described as ‘dynamic false contour effect’. A technique called bit line repeat coding has been developed for reducing the false contour effect. According to this technique sub-field coding is done with common (CSF) and normal sub-fields (SF) where for the common sub-fields (CSF) identical entries in the sub-field code words of two or more corresponding pixels on two or more pixel lines are used. In this specific sub-field coding method some cases will occur in which an error has to be made due to the reduced flexibility in encoding produced by the need to have the same code on common sub-fields (CSF). The general idea of the invention is now to put the coding failures on the higher video levels of the two or more pixels being grouped together.Further improvements concern picture content analysis and or motion detection for controlling the switching between different sub-field coding modes and a specific adapted…