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Low-delay video coding adaptive Qp cascade method

A video coding, low-latency technology, applied in the field of video coding

Active Publication Date: 2017-12-01
FUZHOU UNIV
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Problems solved by technology

[0003] In view of this, the purpose of the present invention is to provide an adaptive Qp cascading method for low-delay video coding, which solves the Qp allocation problem of different layers in video coding, and achieves the purpose of rate-distortion optimization

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  • Low-delay video coding adaptive Qp cascade method

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Embodiment Construction

[0065] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0066] This embodiment provides an adaptive Qp cascading method for low-delay video coding, including the following steps:

[0067] Step S1: Dividing the video sequence into multiple image groups, constructing a hierarchical structure of the image groups, each image group is composed of 4 frames, which are respectively at different levels;

[0068] Step S2: Deriving a rate-distortion optimization model according to the dependencies between different layers and image groups;

[0069] Step S3: Introduce relevant models, transform the rate-distortion optimization model into the problem of solving the optimal Qp, and at the same time update the model parameters to adapt the model to different video sequences; and refer to the Lagrangian multiplier Λ and the Newton-Raphson method to solve The best Qp of each layer of the model, reasonably allocate the Qp of...

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Abstract

The invention relates to a low-delay video coding adaptive Qp cascade method. Firstly a video sequence is divided into multiple image groups, the layered structure of the image groups is constructed, and each image group is composed of four frames which are arranged at different layers; then a rate distortion optimization model is derived according to the dependency between different layers and the dependency between the image groups; then a correlation model is introduced, the rate distortion optimization model is converted into the problem of solving the optimal Qp, and the model is enabled to be adaptive to different video sequences by updating the model parameters; and finally the optimal Qp of each layer of the model is solved by introducing the Lagrangian multiplier ^ and the Newton-Raphson method, the Qp of each frame is reasonably allocated and thus rate distortion optimization can be realized. The adaptive cascade algorithm for low-delay video coding is put forward for mainly solving the problem of allocation of low-delay video coding.

Description

technical field [0001] The invention relates to the technical field of video coding, in particular to an adaptive Qp cascading method for low-delay video coding. Background technique [0002] Compared with H.264, in order to further improve the coding efficiency under the premise of the same coding quality, the HEVC (High Efficiency Video Coding) standard proposes many new technologies. These include a new prediction structure, larger coding tree units, more intra prediction modes, and the adoption of a layered coding structure, which allows different layers to use different Qp. However, in the description of the HEVC standard, it is not clearly stated in the guarantee How to determine the best Qp when the (average quantization parameter of the image group) remains unchanged. In the existing schemes, such as the static Qp cascading scheme, which is inspired by a large number of experimental data, maintaining a fixed Qp setting cannot adapt to different video sequences, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/114H04N19/147H04N19/19
CPCH04N19/114H04N19/147H04N19/19
Inventor 徐艺文李林贵李棋赵铁松范振嘉
Owner FUZHOU UNIV
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