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Intra-frame prediction code rate control method

A bit rate control and intra-frame prediction technology, applied in the field of video coding and bit rate control, can solve imperfect problems and achieve the effect of improving bit rate control performance

Active Publication Date: 2017-10-20
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

However, since the complexity cannot represent the encoding characteristics of all content, this method still has imperfections

Method used

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  • Intra-frame prediction code rate control method

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Embodiment

[0091] This embodiment proposes a code rate control method based on the intra frame of the convolutional neural network. The system architecture adopted by the method is as follows figure 1 shown. Two of the networks are used to learn the α and β parameters of the input CTU, respectively. For the input whole frame image, it is first divided into several CTUs, and then each CTU is used as the input of two networks respectively, and the parameters α and β are obtained through prediction. Finally, the bit allocation at the CTU level is performed to obtain the respective λ parameters of each CTU.

[0092] The method uses the R-λ model and includes the following steps:

[0093] Step 1. Divide frames used for intra-frame coding in the video into multiple coding tree units;

[0094] Step 2, input a plurality of coding tree units into the pre-trained convolutional neural network, and obtain the model parameters of each of the plurality of coding tree units through calculation;

[...

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Abstract

The invention provides an intra-frame prediction code rate control method. An R-lambda model is adopted, and the method comprises the following steps: dividing a frame for intra-frame encoding into a plurality of encoding tree units; inputting the plurality of encoding tree units into a pre-trained convolutional neural network, and performing operation to obtain each model parameter in the plurality of encoding tree units; performing bit allocation on the plurality of encoding tree units according to the model parameters; obtaining a target bit number of each one of the plurality of encoding tree units, and accomplishing the intra-frame prediction code rate control. According to the intra-frame prediction code rate control method, as the parameters of the R-lambda model are predicted by using the convolutional neural network, thereby realizing precise description of the video contents encoding property, and thus the intra-frame prediction code rate control performance is improved.

Description

technical field [0001] The invention belongs to the field of video coding and code rate control, and more specifically relates to a code rate control method for intra-frame prediction. Background technique [0002] In video coding, the purpose of rate control is to optimize the quality of the reconstructed video after encoding under the limit of a given encoding rate. For a video sequence, the code rate control of a frame encoded by intra-frame prediction (intra frame) is more important than that of a frame encoded by inter-frame prediction (inter frame), which is mainly reflected in two aspects. One is that compared with inter frames, intra frames usually consume more bits; the other is that intra frames are used as references during inter prediction, so the coding quality of intra frames will affect the coding of subsequent frames. [0003] In the current new generation of video coding standard High Efficiency Video Coding (HEVC), a quantity complexity (C) representing th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/147H04N19/19H04N19/96H04N19/593
CPCH04N19/147H04N19/19H04N19/593H04N19/96
Inventor 陈志波李业刘东
Owner UNIV OF SCI & TECH OF CHINA
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