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Low-complexity video coding method based on quadtree probability prediction

A low-complexity, video coding technology, applied in the fields of digital video signal modification, electrical components, image communication, etc., can solve the problem of reducing the computational complexity of the encoder side

Inactive Publication Date: 2016-12-07
BEIJING UNIV OF TECH
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Problems solved by technology

Therefore, if the quadtree division process in HEVC can be directly simplified, the computational complexity at the encoder side will be significantly reduced
Most of the existing quadtree optimization algorithms realize low-complexity coding by skipping unnecessary prediction depths, and in a sense ignore the important factor that different quadtree root nodes will also affect the coding complexity.

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  • Low-complexity video coding method based on quadtree probability prediction
  • Low-complexity video coding method based on quadtree probability prediction
  • Low-complexity video coding method based on quadtree probability prediction

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Embodiment Construction

[0033] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] In order to avoid full traversal calculation of HEVC quadtree nodes, the present invention provides a low-complexity video coding method based on quadtree probability prediction, the process is as follows figure 1 As shown, follow the steps below:

[0035] In the first step, a coded quadtree with a tree depth of 4 and a root node size of 64×64 pixels is used to encode all coded frames in the first Group of picture (GOP), and each frame in the initial GOP is obtained The optimal coding unit (CU) distribution probability P of the image;

[0036] P = N ( C U ) N ( CU 64 ) ...

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Abstract

The invention belongs to the field of video compression coding, and discloses a low-complexity video coding method based on quadtree probability prediction. A root node and the tree depth of a coding frame quadtree are predicted based on an internal parameter of a coder; furthermore, the root node and the tree depth of the prediction quadtree are regularly updated; and thus, the prediction precision of a following coding frame is ensured. By means of the technical scheme disclosed by the invention, coding time saving in different degrees can be realized under lossy compression configuration, such as full intra-frame, low delay and random access; furthermore, code rate increasing is reduced; and the subjective quality of a reconstructed image is better.

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 quadtree probability prediction. 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 more complex encoding techniques. Therefore, the optimization of coding complexity has always been the goal pursued by researchers. Among the many research works on HEVC low-complexity coding, the research results on the problem of mode division in predictive coding are relatively outstanding. These methods can effectively reduce the amount of computation in the quadtree partitioning process to a certain extent. However, every time HEVC performs quadtree division, it...

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Application Information

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IPC IPC(8): H04N19/70H04N19/60H04N19/593H04N19/46H04N19/44
CPCH04N19/70H04N19/44H04N19/46H04N19/593H04N19/60
Inventor 刘鹏宇高原贾克斌
Owner BEIJING UNIV OF TECH
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