Character protection device and dynamic adaptive deinterlacing device

Abstract

The invention relates to a character protection device for deinterlacing operation, which comprises a pixel interpolation operation unit, a character detector and a vertical interpolation unit, wherein the pixel interpolation operation unit is used for calculating the pixel value differences among a plurality of pixel pairs in a pattern field according to the position for inserting a target pixel in the pattern field, and the plurality of the pixel pairs form a detection region which corresponds the target pixel; the character detector is used for judging whether the detection region contains character strokes or not according to the distribution of the pixel value differences of the detection region, judging whether the target pixel is positioned in the range of the character strokes or not and further producing a character detection signal; and the vertical interpolation unit is used for carrying out vertical interpolation operation according to the character detection signal and further producing a pixel value of the target pixel.

Description

technical field [0001] The present invention refers to a text protection device for de-interlacing operation, in particular to a text protection device for dynamic adaptive de-interlacing operation. Background technique [0002] Image display technologies can be roughly divided into two types: interlaced scan and progressive scan. When a traditional interlaced scan technology displays a video frame, two fields (fields) composed of odd-numbered scan lines and even-numbered scan lines of the video frame are scanned successively. The progressive scan technology, also known as non-interlaced, is to scan all the scan lines in the video frame sequentially at double the horizontal scan frequency, so that the quality of the picture can be improved. [0003] Since each frame of an interlaced image has only half of the original frame, if the interlaced image data is to be displayed in a progressive scan mode, the interlaced image signal to be played must be "interlaced to progressive...

AI Technical Summary

Problems solved by technology

[0006] However, when the video signal contains dynamic text images, such as marquee subtitles in news channels or vertically scrolling actor lists in movies, etc., if the existing in-field de-interlacing technology is used to process the dynamic text images, Since the edge detection mechanism regards the direction with a small difference in pixel values ​​as the edge of the image object, it is easy to misjudge the edge direction at the intersection of strokes or horizontal strokes in the text image, resulting in blurred text images, such as figure 1 shown

As a result, it will not be able to meet the user's requirements for high-quality images

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