Filtering system and method for removing ringing noises in video signal in scaler

Abstract

The invention provides filtering system and method for removing ringing noises in a video signal in a scaler, wherein filtering is carried out on the video signal in a first direction and a second direction so as to remove ringing noises generated after the video signal is subjected to the filtering in the first direction and the second direction. In the invention, a video area judging device is used for accurately judging area attributes in the video signal. When an area in the video signal is a marginal area plus a flat area, a weighting coefficient is adjusted to increase low-frequency components so as to remove an overexcitation or underexcitation phenomenon in the video signal; and when the area in the video signal is the flat area and is not the marginal area plus the flat area, theweighting coefficient is adjusted to preserve high-frequency components. Therefore, the overexcitation or underexcitation phenomenon generated due to the use of a filter can be effectively filtered and removed.

Description

technical field [0001] The invention relates to the technical field of video processing, in particular to a filtering system and method for removing ringing noise of video signals in a scaler. Background technique [0002] In LCD TVs, the resolution of the video signal source is often fixed. When displaying on different panels with different resolutions, the video of the video source needs to be scaled to be suitable for playing on panels with different resolutions. US Patent No. 5,739,867 discloses a video scaling technique that can be used on a liquid crystal display. [0003] During scaling, filters are often used to perform scaling operations. In video processing, overshooting or undershooting tends to occur on the filtered video due to the frequent use of filters, and thus ringing noises (ringing) tend to be generated during the scaling process. [0004] The method of deringing noise (deringing) is proposed in Annex F of the MPEG 4 specification. It first calculates ...

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Problems solved by technology

[0005] However, what MPEG 4 discloses is only the existing technology for removing ringing noise. When it is applied to the scaler, it is easy to cause attenuation to high-frequency signals, such as the edge (edge) in the video will be blurred, or after the scaler Need to increase the line buffer (line buffer) to cope with the new data

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