Fast prediction direction decision method for efficient video coding
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A high-efficiency video coding and prediction direction technology, applied in the field of video coding, can solve the problem of high coding complexity, achieve the effect of improving coding speed, reducing the number of prediction directions, and saving coding time
Inactive Publication Date: 2018-09-28
HARBIN INST OF TECH
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[0006] The purpose of the present invention is to provide a fast prediction direction decision-making method for high-efficiency video coding to solve the problems of high coding complexity and failure to use PU between adjacent tree-shaped coding layers to predict The correlation in the direction completes the rapid prediction direction decision-making, and fails to use the relationship between the prediction direction and the corresponding Hadamard transformation cost value to complete the fast prediction direction decision-making
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specific Embodiment approach 1
[0027] Specific implementation mode 1: This implementation mode describes the implementation process of a fast prediction direction decision-making method for high-efficiency video coding. The flow chart is as follows Figure 4 Shown; A kind of fast prediction direction decision-making method for high-efficiency video coding that the present invention proposes comprises the following steps:
[0028] Step 1. Determine whether the coding depth of the coding layer where the current PU is located in the tree coding structure is 0; if yes, construct the initial candidate prediction direction list CL 0 , then, go to step 3; otherwise, go to step 2; where, the initial list of candidate prediction directions CL 0Including Planar mode, DC mode, and prediction directions with even numbers (see figure 1 ), as shown in formula (3):
[0029] CL 0 ={0,1}∪{2,4,...,34} (3)
[0030] In the formula, 0 means Planar mode, 1 means DC mode, 2, 4, ..., 34 means 17 prediction directions with even...
specific Embodiment approach 2
[0048] Embodiment 2: This embodiment differs from Embodiment 1 in that the value of λ in step 5 is set to 1.5. This setting is to ensure that the encoding performance of the HEVC standard is not lost, and at the same time save as much encoding time as possible.
[0049] Validate the method of invention
[0050] A fast prediction direction decision-making method for high-efficiency video coding proposed in the present invention is integrated into the HM13.0 open source reference software developed by JCT-VC. In order to verify the effectiveness of the present invention, 17 standard video sequences recommended by JCT-VC covering 5 resolutions (Class A-Class E) were used in the test. Among them, Class A is an ultra-clear video sequence with a resolution of 2560×1600; Class B and Class E are 1080P (with a resolution of 1920×1080) and 720P (with a resolution of 1280×720) high-definition video sequences; Class D is respectively WVGA (resolution is 832×480) and WQVGA (resolution is...
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Abstract
The invention provides a fast prediction direction decision method for efficient video coding and relates to the technical field of video coding. The method aims to solve the problem that the existinghigh-efficiency video coding technology has high coding complexity, fails to utilize correlation of the PU in the prediction direction between adjacent tree coding layers to complete a fast prediction direction decision, and fails to utilize the relationship between the predication direction and the corresponding Hadamard transform cost value to complete a fast prediction direction decision. Thefast prediction direction decision method for efficient video coding in the invention utilizes the correlation between the prediction directions of the PU and the correlation of the PU in the prediction direction in the adjacent tree coding layer to construct an initial candidate prediction direction list for the PU. The relationship between the prediction direction and the corresponding Hadamardtransform cost value is used for reducing the number of prediction directions that need to be processed by RQT. Experiments have shown that the method in the present invention can significantly reducethe coding time of the HEVC standard without affecting the coding efficiency. The method in the invention is applied to the field of prediction direction decision making for high-efficiency video coding.
Description
technical field [0001] The invention relates to a fast prediction direction decision-making method for high-efficiency video coding, and relates to the technical field of video coding. Background technique [0002] The Joint Video Experts Group (JCT-VC), which is composed of the International Telecommunication Union Telecommunication Standardization Sector (ITU-T) Video Coding Experts Group (VCEG) and the International Organization for Standardization (ISO) Motion Picture Experts Group (MPEG), jointly developed a high-definition, A new generation of video coding standard for ultra-high-definition video applications - High Efficiency Video Coding (HEVC) standard. Compared with the previous-generation video coding standard—Advanced Video Coding (AVC) standard, the HEVC standard can provide higher coding efficiency. Under the condition of obtaining the same reconstructed video quality as the AVC standard, the HEVC standard can save more than 50% of the encoding bit rate, that ...
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