Thomson Consumer Electronics S.a.

Jean-Claude Chevet

Nadine Bolender

Werner Boie

A video signal is applied to a kinescope having scan velocity modulation for improving picture sharpness in the vertical direction. Pictures from video signals of a type having non-interpolated and vertically interpolated lines (e.g., interlace-progressive up-converted) will tend to exhibit a significant reduction of sharpness in vertical direction. This problem is corrected by applying scan velocity modulation only to the interpolated lines of the video signal. Furthermore, the vertical deflection is restricted to horizontal structures or real vertical transitions, respectively. In order to have a high noise immunity of this sensitive processing, the resulting luminance amplitude of the shifted line as well as the vertical deflection is controlled to be strongly dependent on the current video signal (soft decision).

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Fegersheim, France

Jean-Claude Chevet