Patent ID: 8184204

Claim:
A de-ring system for reducing overshooting and undershooting of a video signal in a scaler, comprising: a first directional linear filter for receiving the video signal to perform a first directional scaling on pixels in the video signal and generating a first directional linear filtering signal; a first directional filter with high/medium frequency boost for receiving the video signal to perform a first directional scaling and frequency boosting on pixels in the video signal and generating a first directional frequency boosting filtering signal; a first directional region judgment device for receiving the video signal and judging the region in the video signal to generate a first adjustment coefficient; a first directional clamping device for receiving the video signal and being connected to the first directional filter with high/medium frequency boost to perform clamping operation on the first directional frequency boosting filtering signal based on a maximum and a minimum of pixels in the video signal, and generate a first directional clamping signal; and a first mixer connected to the first directional filter with high/medium frequency boost, the first directional clamping device and the first directional region judgment device for adjusting weight of the first directional frequency boosting filtering signal and the first directional clamping signal based on the first adjustment coefficient, and generating a first directional output signal.