Abstract: For reducing the false contour effect the gravity center coding is utilized. However, a GCC with a few number of levels introduces noise in a picture. Therefore, each picture is divided into segments and such GCC is performed only in regions, where the false contour effect is critical. This is the case for skin areas of a picture. Such areas are detected by the color analysis and texture analysis. If this analysis leads to a skin area, a specific false contour mode for data processing is used. Otherwise, a standard mode is employed.

Abstract: The present invention relates to a method and an apparatus for controlling the power level and/or the contrast in a display device having a plurality of luminous elements corresponding to the colour components of the pixels of a picture, wherein the luminance generated by each of said luminous element is based on the intensity of the signal supplied to the luminous element and the power level and/or contrast for each picture is controlled by adjusting the intensity of the signal to be supplied to each luminous element. The invention is applicable to organic light emitting displays (OLED). According to the invention, the intensity of the signal to be supplied to each luminous element is based on reference signals and the adjustment of the signal intensity is made by adjusting the level of the reference signals.

Abstract: For reducing the false contour effect the gravity centre coding is utilized. However, a GCC with a few number of levels introduces noise in a picture. Therefore, each picture is divided into segments and such GCC is performed only in regions, where the false contour effect is critical. This is the case for skin areas of a picture. Such areas are detected by the colour analysis and texture analysis. If this analysis leads to a skin area, a specific false contour mode for data processing is used. Otherwise, a standard mode is employed.

Abstract: The present invention relates to a method and an apparatus for controlling the power level and/or the contrast in a display device having a plurality of luminous elements corresponding to the colour components of the pixels of a picture, wherein the luminance generated by each of said luminous element is based on the intensity of the signal supplied to the luminous element and the power level and/or contrast for each picture is controlled by adjusting the intensity of the signal to be supplied to each luminous element. The invention is applicable to organic light emitting displays (OLED). According to the invention, the intensity of the signal to be supplied to each luminous element is based on reference signals and the adjustment of the signal intensity is made by adjusting the level of the reference signals.

Abstract: A logic circuit providing a bi-level signal, one level of which agrees with eriods of time during which the video signal corresponds to a quadrant of a first broadcast television program, said quadrant being free from horizontal and vertical synchronizing pulses present in the video signal of a second broadcast program.

Abstract: A circuit system for a television receiver, said system operating to repl a changing quadrant of the picture of a main transmitted program with an equivalent-size sector of a second transmitted program.