Two-dimensional comb filter and luminance and chrominance separation method

Abstract

The embodiment of the invention discloses a two-dimensional comb filter and a luminance and chrominance separation method, which are used for accurately separating luminance and chrominance from a composite video signal. The two-dimensional comb filter in the embodiment of the invention comprises a direction relevance detection unit, vertical and horizontal comb filters, an arbitrament unit, a selector and a computing unit, wherein the direction relevance detection unit is used for detecting the similarity of the luminance and chrominance of pixel points in vertical and horizontal directions of the input composite video signal and outputting the detection result to the arbitrament unit; the vertical and horizontal comb filters are used for performing comb filtration on the input composite video signal in the vertical and horizontal directions and outputting the processing result to the selector; the arbitrament unit is used for judging the processing result of the vertical comb filter or the horizontal comb filter according to the detection result of the direction relevance detection unit and outputting the judgment result to the selector; and the selector and the computing unit are used for performing luminance and chrominance separation. The invention also provides the luminance and chrominance separation method corresponding to the two-dimensional comb filter.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a two-dimensional comb filter. Background technique [0002] Composite video is the most ubiquitous type of video signal and involves the lowest equipment and cost. Although the video playback system has entered the high-definition era, the playback of composite video signals and frequency signals is still widely used due to the need for higher cost support to complete the playback and reception of high-definition signals. [0003] In the YUV model, "Y" represents brightness (Luminance or Luma), which is the grayscale value, while "U" and "V" represent chroma (Chrominance or Chroma), which are used to describe image color and saturation degree to specify the color of the pixel. The composite video signal is synthesized by modulating the luminance component (Y) and the chrominance component (U, V), and superimposing the synchronous signal component at the same time. The composit...

AI Technical Summary

Problems solved by technology

[0016] Although this bright color separation method is simple to implement, for images with weak vertical correlation (such as flowers, grass, woods, feathers, complex textures, etc.), it can only be biased towards the processing results of the band-stop filter.

However, the band-stop filter cannot distinguish the luminance and chrominance components in the composite video signal very well, and it is easy to produce an overshoot effect on the vertical boundary of the luminance, making the image unnatural (such as: a thin line appears on a bright edge). Black border)

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