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Lagrange factor computing method oriented to intra-frame code rate control

A calculation method and factor technology, applied in the field of video coding, can solve problems affecting coding performance and achieve the effects of improving coding efficiency, low coding complexity, and high accuracy

Inactive Publication Date: 2018-11-02
XIAN UNIV OF TECH
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Problems solved by technology

But for the prevailing ultra-high-definition video and HEVC encoders, the code rate control under this assumed condition affects the encoding performance to a certain extent

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  • Lagrange factor computing method oriented to intra-frame code rate control
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Embodiment Construction

[0045] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] The present invention is oriented to the SATD Lagrangian factor calculation method, and the specific calculation process is as follows figure 1 as shown,

[0047] Step 1, calculate parameter α:

[0048] Assuming that the top coding block of the i-th CTU is the m-th CTU, and its left coding block is the n-th CTU, obtain the θ of the m-th CTU according to formula (7) m and θ of the nth CTU n :

[0049] D=D o +θ·D r (7);

[0050] where D represents the total distortion of the encoded block, D o Indicates the total distortion generated by intra prediction between the current pixel value and the original value of the reference pixel, D r Indicates the total distortion produced by the original value of the reference pixel and the reconstructed value of the reference pixel after intra-frame prediction respectively, and then calculate...

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Abstract

The invention discloses a Lagrange factor computing method oriented to intra-frame code rate control. The method comprises the following steps: deriving the Lagrange factor LambdaSSE based on the SSEin the code rate control in combination with the Lagrange optimization according to the intra-frame distortion propagation feature; deriving a distortion propagation model according to the intra-frameprediction coding principle since the space between the reference pixel and the prediction pixel can be described as a one-dimension Gaussian Markov model, and computing the distortion propagation parameter alpha; and meanwhile, acquiring the original Lagrange factor Lambda by using the code rate control principle. Through the method disclosed by the invention, the Lagrange factor LambdaSSE can be acquired by computing the parameters Alpha and Lambda, the method has low coding complexity, and is only the 0.1% of the existing algorithm; and the Lagrange factor LambdaSSE under the intra-frame code rate control obtained from the rate distortion principle has high accuracy.

Description

technical field [0001] The invention belongs to the technical field of video coding, and in particular relates to a Lagrangian factor calculation method oriented to intra-frame code rate control. Background technique [0002] The wave of informatization is affecting all aspects of users' lives with unprecedented breadth and depth. In this trend, video, as a medium, brings users an unprecedented visual feast. Users can obtain rich video content and services anytime and anywhere through devices, and the participation of more and more users has brought new challenges to video technology. Video carries all the visual information of the space, which not only increases the burden on the video storage system and communication network, but also affects the deployment and application of subsequent new services. Therefore, video coding has become the focus of the industry. [0003] The new-generation video coding standard HEVC (High Efficiency Video Coding, High Efficiency Video Cod...

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Application Information

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IPC IPC(8): H04N19/593H04N19/50H04N19/176H04N19/146
CPCH04N19/146H04N19/176H04N19/50H04N19/593
Inventor 李维张二虎景翠宁
Owner XIAN UNIV OF TECH
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