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Low-complexity video coding method based on time-space correlation

A spatio-temporal correlation, low-complexity technology, applied in the fields of digital video signal modification, electrical components, image communication, etc., can solve the problem of high computational complexity, and achieve the effect of reducing computational time and improving execution efficiency

Active Publication Date: 2017-08-18
BEIJING UNIV OF TECH
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Problems solved by technology

Therefore, one CTU encoding will perform 85 CU calculations, and the calculation complexity is high.

Method used

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Embodiment Construction

[0018] Combine below figure 1 , 2 The present invention will be described in detail.

[0019] In order to avoid full traversal calculation of HEVC quadtree nodes, the present invention provides a low-complexity video coding method based on spatio-temporal correlation, the process is as follows figure 2 As shown, follow the steps below:

[0020] The first step is to judge whether there are spatiotemporal adjacent blocks in the current CTU. If not, perform a complete quadtree traversal on the CTU according to the calculation process of the HEVC standard; if it exists, calculate its predicted depth Depth Pre and predicted standard deviation StaDev Pre , and proceed to the second step. Wherein the set of spatio-temporal adjacent blocks of the current CTU is Ω={C L1 , C L2 , C AL , C A1 , C A2 , P Col}, see figure 1 , C L1 、C L2 The two right sub-blocks divided by the left CTU of the current CTU in the form of a quadtree; C AL It is the lower right sub-block divided ...

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Abstract

The invention discloses a low-complexity video coding method based on time-space correlation. The quadtree depth range of a current coding CTU is effectively predicted through quadtree depth information of a time-space adjacent CTU of the current coding CTU; therefore, complete quadtree traversal is avoided; and, the calculation time that a coder obtains the optimal quadtree depth can be reduced. By means of the technical scheme in the invention, 34% of coding time can be averagely saved under random access configuration; furthermore, a little code rate is increased; and the subjective quality of a reconstructed image is good.

Description

technical field [0001] The invention belongs to the field of video compression coding, in particular to a low-complexity video coding method based on time-space correlation. Background technique [0002] At present, HEVC (High efficiency video coding, HEVC) has become the best choice for storing and transmitting high-quality and high-resolution videos under limited storage resources and network bandwidth. Still not stopping. In order to obtain higher compression performance, the HEVC standard adopts a more complex encoding technology, which significantly improves the encoding efficiency, but also leads to a substantial increase in the encoding complexity. According to statistics, in the encoding of a video sequence, the inter-frame predictive encoding takes 80%-90% of the entire video encoding time, which is mainly due to the ultra-high calculation of CU (Coding Unit, CU) division based on the quadtree structure. caused by complexity. The division of CU in HEVC generally ...

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Application Information

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IPC IPC(8): H04N19/96H04N19/154H04N19/11H04N19/176
CPCH04N19/11H04N19/154H04N19/176H04N19/96
Inventor 刘鹏宇段堃
Owner BEIJING UNIV OF TECH
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