Chroma equalization method for video coding

An equalization method and video coding technology, applied in the field of video coding, can solve problems such as spatial sampling rate difference, wasted bit rate, unbalanced compression of luminance and chrominance components, etc.

Inactive Publication Date: 2008-02-06
融创天下(上海)科技发展有限公司
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Problems solved by technology

[0005] In order to solve the technical problem of unbalanced compression of luminance and chrominance components due to the difference in spatial sampling rate of the luminance and chrominance components in the image encoding process in th

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  • Chroma equalization method for video coding
  • Chroma equalization method for video coding
  • Chroma equalization method for video coding

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[0024] Referring to FIG. 2 , FIG. 2 is a schematic flowchart of the chromaticity equalization method of the present invention. In the present invention, by analyzing the current image luminance and chrominance component residuals and their distribution, the difference between the luminance component PSNR and the chrominance component PSNR of the reconstructed image is predicted, and then the chrominance quantization parameter is corrected to control the compression of the chrominance component ratio, the equalization method includes the following steps:

[0025] 1. Get the luminance component residual SAD between the current image and the predicted image Y and chroma component residual SAD C .

[0026] The residual value of luma and chroma components can be calculated by the following formula:

[0027] SAD = Σ i , j | Diff ( ...

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Abstract

The present invention relates to a chromatic degree equalization method and a chromatic degree quantification parameter correcting method used for the video frequency coding. The equalization method comprises: the method obtains the brightness component residual error SADY and chromatic degree component residual error SADY between the present image and the advancedly measured image; after obtaining the brightness component residual error SADY and chromatic degree component residual error SADY, the residual error SATDY and SATDC in the frequency field is got through calculation; on basis of the residual error SADY, SATDC and brightness quantification parameter QPY and the correcting chromatic degree quantification parameter QPC, the coding is held respectively on basis of the brightness component and the chromatic degree component from the brightness quantification parameter QPY and the chromatic degree quantification parameter QPC. Through the method, using the present image brightness and the chromatic degree component residual error and the comparison of the distribution, adjusting the chromatic degree quantification parameter, and controlling the compress ratio of the chromatic degree component, thereby balancing the peak value SNR for the chromatic degree component and the brightness component, further balancing the renewing quality and saving code rate.

Description

【Technical field】 [0001] The invention relates to a video encoding method, in particular to a chroma equalization method and a chroma quantization parameter correction method for video encoding. 【Background technique】 [0002] In the case of video real-time communication, the sampling format of the video signal is usually Y:U:V=4:2:0, and the Baseline Profile (basic grade) of the digital video coding standard H.264 also only supports Y:U:V=4: 2:0 format. As shown in FIG. 1 , under this sampling format, every four sampling points of the luminance component (Y) corresponds to one sampling point of the chrominance components (U, V) on average. The reason for adopting this sampling format is to use the characteristics of human vision, that is, the sensitivity to luminance components is greater than that to chrominance components. [0003] The difference in the spatial sampling rate between the luma component and the chrominance component determines their difference in image co...

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Application Information

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IPC IPC(8): H04N7/26H04N9/68H04N19/146H04N19/186
Inventor 马国强
Owner 融创天下(上海)科技发展有限公司
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