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Low-complexity method for selecting HEVC coding multiple reference frames

A low-complexity, multi-reference technology, applied in the field of video coding, can solve the problems of not using correlation correlation, multi-reference frame selection speed improvement, etc., to achieve high rate-distortion performance, speed up, and strong practicability.

Active Publication Date: 2014-05-21
ZHEJIANG UNIV
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Problems solved by technology

[0007] These algorithms mainly use the characteristics of the image content, and do not take advantage of the correlation of the best reference frames between PUs of different depths in the HEVC encoder and the correlation between the best reference frames of the same depth and different division methods. The speed of multiple reference frame selection need further improvement

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  • Low-complexity method for selecting HEVC coding multiple reference frames
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  • Low-complexity method for selecting HEVC coding multiple reference frames

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[0028] The method for selecting multiple reference frames for low-complexity HEVC coding of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] Such as figure 1 As shown, a low-complexity method for selecting multiple reference frames for HEVC encoding comprises the following steps:

[0030] (1) Input the original coding sequence;

[0031] (2) Take the coding tree (CTU) unit as the unit, and select the best reference frame for each coding unit (CU).

[0032] Taking the coding tree unit as a unit, multi-reference frame selection is performed for coding units of different depths. The coding units of different depths are 64×64 coding units, 32×32 coding units, 16×16 coding units, 8×8 coding units, 4×4 coding units, of which: 64×64 coding units are parent coding units of 32×32 coding units; 32×32 coding units are parent coding units of 16×16 coding units; 16×16 coding units are 8×8 coding units The parent coding unit o...

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Abstract

The invention discloses a low-complexity method for selecting HEVC (High Efficiency Video Coding) coding multiple reference frames. The method comprises the following steps of inputting an original coding sequence, taking a code tree cell as the unit, and selecting the optimal reference frame for each coding cell through the operations of a, if the parent coding unit of the current coding unit is in an SKIP mode, taking the optimal reference frame of all forecast cells in the current coding unit as the optimal reference frame of the parent coding unit, and b, if the parent coding unit of the current coding unit is not in the SKIP mode, firstly selecting multiple reference frames for forecast cells in an inter-frame dividing mode of 2N*2N of the current coding unit, and calculating the rate distortion cost of each reference frame in the 2N*2N inter-frame dividing mode, gathering all reference frames of which the rate distortion costs are lower than a threshold in a reference frame set, and selecting the optimal reference frame for the rest inter-frame dividing modes in the reference frame set. The low-complexity method is capable of remarkably speeding up HEVC video coding.

Description

technical field [0001] The invention relates to the field of video coding, in particular to a method for selecting multiple reference frames for HEVC coding with low complexity. Background technique [0002] HEVC adopts a flexible data division method. For example, a coding tree unit (CTU, Coding Tree Unit) with a size of 64×64 and a depth of 4 can contain up to 85 coding units (CU, Coding Unit). [0003] Each CU needs to perform intra-frame prediction and inter-frame prediction in units of prediction units (PU, Prediction Unit). Each CU has up to eight inter-frame division modes (inter2N×2N, inter 2N×N, inter N×2N, inter2N×nU, inter2N×nD, inter nL×2N, inter nR×2N and inter N×N), Among them, inter N×N is valid only when the CU is the smallest CU, and in order to save memory bandwidth during motion compensation, there is no 4×4 division for inter prediction. [0004] Therefore, for a CTU, each CU has seven division methods: inter2N×2N, inter2N×N, inter N×2N, inter2N×nU, int...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/122H04N19/159H04N19/567H04N19/56
Inventor 陈耀武周承涛周凡
Owner ZHEJIANG UNIV
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