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De-noising method and device for ringing effect
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A technology of ringing effect and preset value, applied in the field of video coding, can solve problems such as the degradation of coding performance, and achieve the effect of suppressing artificial noise and improving subjective quality.
Inactive Publication Date: 2011-08-31
深圳市云宙多媒体技术有限公司
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[0004] The purpose of the embodiment of the present invention is to propose a block effect denoising method and device, aiming at solving the problem of degradation of coding performance caused by artificial noise in the prior art
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Embodiment 1
[0037] The present invention proposes a ringing effect denoising method, see figure 1 , the method is:
[0038] Step 101: Calculate the ringing intensity of each pixel in the entire frame of image; and calculate the possibility coefficient of the ringing effect of each pixel according to the ringing intensity;
[0039] (1) Taking the first pixel as an example, the method for calculating the ringing intensity of the pixel may be: calculating the ringing intensity of the first pixel in four directions;
[0040] see figure 2 , the four directions are the first direction - 180 degrees in the horizontal direction, the second direction - 45 degrees counterclockwise with the first direction, the third direction - 90 degrees counterclockwise with the first direction, The 4th direction - 135 degrees counterclockwise with the 1st direction;
[0041] The specific method for calculating the ringing intensity of the first pixel in four directions is:
[0042] The pixel value of the fi...
Embodiment 2
[0059] Embodiment 2, the present invention also provides a ringing effect denoising device, see Figure 4 , calculation unit, processing unit;
[0060] A calculation unit, which calculates the ringing intensity of each pixel in the entire frame image; and calculates the possibility coefficient of each pixel's ringing effect according to the ringing intensity;
[0061] The processing unit judges whether the ringing intensity of the first pixel in the whole frame image is greater than the first parameter, and if so, judges whether the sum of the possibility coefficients of the ringing effect of the first pixel to the ninth pixel in the whole frame image is greater than the second parameter. parameter, if so, use the first operator to filter the first pixel.
[0062] The calculation unit is used to calculate the ringing intensity of each pixel in the whole frame image specifically as follows:
[0063] The pixel value of the first pixel in the whole frame image is ; , , , are ...
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Abstract
The invention provides a de-noising method and a device for ringing effect. The method comprises following steps: calculating the ringing intensity of each pixel in a complete frame image; calculating the ringing effect possibility coefficient of each pixel according to the ringing intensity; determining whether the ringing intensity of the first pixel is greater than the first parameter in the complete frame image, if yes, then determining whether the sum of the ringing effect possibility coefficient of the first pixel to the ninth pixel is greater than the second parameter, and filtering the first pixel by using the first operator. The de-noising method for the ringing effect effectively detects the ringing effect of the pixel and can inhibit the artificial noise, so as to improve the subjective quality of the video. The invention also provides a de-noising device for ringing effect.
Description
technical field [0001] The present invention relates to the field of video coding, in particular to a block effect denoising method and device. Background technique [0002] In commonly used video coding, in order to remove the correlation in image signals and reduce the dynamic range of image coding, transform coding and quantization techniques based on macroblocks are usually used. When the encoding quantization parameter is large, ringing effects may appear near strong edges due to the suppression of high-frequency signals, and the artificial noise generated by these encodings will reduce the subjective experience of the video. When encoding such video sequences with artificial noise, the encoding performance will also decrease. [0003] Therefore, it is necessary to propose a video artificial noise analysis algorithm and a method to improve the coding performance when artificial noise occurs. Contents of the invention [0004] The purpose of the embodiments of the pr...
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