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GOP-level QP-Offset setting method

A series, n-1 technology, applied in the field of GOP-level quantization parameter setting under the support of random access structure, can solve the problems that have not considered the GOP reference correlation, only consider the GOP inter-frame correlation, etc.

Active Publication Date: 2015-09-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the frame-level hierarchical QP-Offset technology under the RA coding structure only considers the inter-frame correlation within the GOP, and has not considered the reference correlation between GOPs.

Method used

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Embodiment

[0064] In order to show the GOP-level QP-Offset setting method proposed by this method more clearly, Table 1 shows the setting process.

[0065] Table 1 GOP-level QP-Offset setting method

[0066]

[0067] In this embodiment, the value of α is 1 / 2; this embodiment counts the reference relationship between GOPs under the number of general GOPs (3 / 4 / 6 / 8) in BIG-GOP, and expands to n Situation such as Figure 5 Shown. Figure 5 , Figure 7 In, ΔWi obeys a certain fixed attenuation law, starting from the last GOP(n-1), with two GOPs as a group, the amplitude of the first GOP group is (ΔW n-1 , ΔW n-2 ), the amplitude exhibits an exponential decay of 1 / 2, as shown in formula (7); that is, the attenuation gradient factor of the influence intensity from GOP-(n-1) to GOP-1 tends to a minimum value of 0, Image 6 Listed when the number of GOPs is 25 ΔW i Case.

[0068] ΔW n - s = ΔW n - 1 · ( 1 2 ) s - 1 2 ( s mod 2 = 1...

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Abstract

The invention provides a GOP-level QP-Offset setting method, which belongs to the technical field of video processing, and particularly relates to a method for setting quantization parameters under all supporting random access (RA) structure conditions. The GOP-level QP-Offset setting method comprises the following steps of through analyzing the reference relationship between GOP under the RA structure, which has the transferred meaning of the effect strength of the current GOP on the following GOP, describing different importance of the GOP through effect strength attenuation factors of the GOP, and adopting the different importance of the GOP as the basis of GOP-level QP-Offset distribution. According to the GOP-level QP-Offset setting method, the time domain redundant information can be further eliminated on the basis of an original frame-level layering QP-Offset technology. The experiments on two platforms of HEVC and AVS2 show that without increasing time complexity, the bit is further saved, and the encoding performance is improved.

Description

Technical field [0001] The invention belongs to the technical field of video processing, and particularly relates to all methods for setting quantization parameters at the GOP level under the Random Access (RA) structure. Background technique [0002] In recent years, people's demand for high-definition and ultra-high-definition video has become increasingly strong, so there are more and more demands for higher compression efficiency. At present, mainstream encoders still use the traditional hybrid coding framework, which mainly includes prediction, transformation, quantization, filtering, and entropy coding. [0003] The video sequence is composed of a number of time-continuous images, and the video sequence can be divided into several groups of pictures (Group of Pictures GOP) during encoding. Random-access (RA) coding structure is time-domain hierarchical structure (Hierarchical B structure, HBP). Generally, 8 frames are used as a GOP, and a random access frame (Clean Random Ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/177H04N19/31
Inventor 朱策徐丽英周益民王勇钟敏高艳博
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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