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Chrominance component prediction method in hybrid video coding standard

A technology of chroma component and prediction method, which is applied in the direction of digital video signal modification, electrical components, image communication, etc., can solve the problems of luminance component and chroma component redundancy, chroma component redundancy, etc., and achieve obvious performance gain, The effect of improved coding efficiency and efficient prediction

Active Publication Date: 2016-02-03
HARBIN INST OF TECH
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Problems solved by technology

[0005] The object of the present invention is to propose a method for predicting chrominance components in hybrid video coding standards in order to solve the problem of redundancy between luminance components and chrominance components and the redundancy of chrominance components in video sequences

Method used

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  • Chrominance component prediction method in hybrid video coding standard
  • Chrominance component prediction method in hybrid video coding standard
  • Chrominance component prediction method in hybrid video coding standard

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specific Embodiment approach 1

[0019] The chrominance component prediction method in the hybrid video coding standard of this embodiment combines figure 1 As shown in the flow chart, the prediction method is realized through the following steps:

[0020] Step 1. The pixel value corresponding to the known pixel point has a luminance component Y and a chrominance component C b and the chrominance component C r Three quantities; obtain the reconstructed luminance component Y and the reconstructed chrominance component C of the effective pixels around the current coding block b and the reconstructed chroma component C r ,, and remove other invalid pixels around the current coding block;

[0021] Step 2. The reconstructed luminance component Y and the reconstructed chrominance component C of the effective pixels obtained in step 1 b , to calculate the linear model C b = α 1 Y+β 1 Medium parameter α 1 and beta 1 value;

[0022] Step 3. Using the linear model C b = α 1 Y+β 1 , the parameter α obtained...

specific Embodiment approach 2

[0028] The difference from Embodiment 1 is that in the chrominance component prediction method in the hybrid video coding standard of this embodiment, the effective pixels around the current coding block in step 1 refer to the left, lower left, upper and upper right of the current coding block pixel. These effective pixels are real. For any non-existing pixels, they will not be filled and removed directly, and will not be used for the calculation of parameters in steps 2 and 4.

specific Embodiment approach 3

[0029] Different from the first or second specific embodiment, the chrominance component prediction method in the hybrid video coding standard of this embodiment,

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Abstract

The invention provides a chrominance component prediction method in a hybrid video coding standard, and belongs to the field of video encoding. The purpose of the invention is to effectively eliminate the correlation between a chrominance component, a luminance component and another chrominance component in videos, and provides the chrominance component prediction method in the hybrid video coding standard, so as to further improve the performance of video coding. The chrominance component prediction method comprises the following steps: when performing chrominance component prediction through a linear model, using pixel points reconstructed around a current coding block to calculate parameters of the linear model; when performing parameter calculation, increasing the surrounding effective pixel points and removing the surrounding unusable pixel points; predicting a Cb chrominance component according to the obtained parameters through a reconstructed luminance component Y; and predicting a Cr chrominance component through the reconstructed luminance component Y and the reconstructed chrominance component Cb. According to the chrominance component prediction method in the hybrid video coding standard provided by the invention, model parameters are calculated through the effective pixel points surrounding the block, and the chrominance component Cr is predicted adaptively through the luminance component Y and the chrominance component Cb, so that the code efficiency is further improved.

Description

technical field [0001] The invention relates to a chrominance component prediction method in a hybrid video coding standard. Background technique [0002] With the improvement of people's requirements for video display quality, new video application forms such as high-definition and ultra-high-definition video have emerged. In the situation that the high-resolution and high-quality video appreciation is more and more widely used, how to enhance the video compression efficiency becomes crucial. During the digitization of images and videos, a large amount of data redundancy is generated, which makes video compression technology possible. Generally speaking, redundancy types include at least spatial redundancy, time redundancy, and information entropy redundancy. For the elimination of spatial redundancy, a method based on prediction is generally used, that is, intra-frame prediction coding. The basic idea is to use the reconstructed pixel values ​​around the current coding ...

Claims

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Application Information

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IPC IPC(8): H04N19/186H04N19/154H04N19/103
Inventor 范晓鹏张涛赵德斌
Owner HARBIN INST OF TECH
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