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Adjustment method of video code rate distortion optimization

A rate-distortion optimization and adjustment method technology, applied in the field of video coding, can solve problems such as reducing the effect of sequence coding and affecting coding of coding units.

Active Publication Date: 2015-02-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] However, under the existing hybrid coding framework, the extensive use of spatial and temporal prediction techniques leads to a strong correlation between coding units, that is, the coding performance of the current coding unit will affect the coding of the following coding units.
Therefore, rate-distortion optimization techniques that do not consider the correlation between coding units will reduce the overall coding effect of the entire sequence

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  • Adjustment method of video code rate distortion optimization

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[0026] The technical invention of the present invention will be described in detail below in conjunction with the embodiments and accompanying drawings.

[0027] The embodiment adopts Visual Studio 2008 as the development environment, and the embodiment is implemented based on HEVC reference software HM13.0.

[0028] Divide the current frame into 16*16 coding units, use motion search technology to obtain the matching coding unit of the current coding unit in the frame next to the current coding unit, and calculate the motion compensation error (OMCP error) based on the original frame and divide by The number of pixels in the coding unit is 256, which is recorded as the average motion compensation error of the current coding unit, and the motion search technique is one of integer pixel search and fractional pixel search. In inter prediction, due to the inter-frame correlation, the cost of the current coding unit i is denoted as J i =D i +λR i +ΔJ i+1 (D i ), the R i is th...

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Abstract

The invention belongs to the technical field of video coding, and particularly relates to an adjustment method of video code rate distortion optimization. The method comprises the steps of in the process of inter-frame predictive coding, firstly, acquiring the change of the code rate of an influenced coding unit under the condition of high code rate to obtain the coding price change of a coding unit behind the current coding unit caused by the coding distortion of the current coding unit; acquiring Lagrangian multipliers used in code rate distortion optimization to obtain the coding price of any coding unit. The adjustment method is suitable for sequence coding with strong inter-frame correlation; compared with the existing high efficiency video coding (HEVC) device, the adjustment method is capable of saving more code rate.

Description

technical field [0001] The invention belongs to the technical field of video coding, and in particular relates to an adjustment method for video coding rate distortion optimization. Background technique [0002] Rate-distortion optimization is a widely used technique in video coding. The goal of rate-distortion optimization is at a given code rate R T Next, minimize the distortion D, that is, min{D}s.t.R≤R T , where R represents the code rate of a current coding unit, and D represents the distortion of the current coding unit. [0003] Current rate-distortion optimization for video coding is to maximize CUs under the assumption of independence between CUs. For example, the encoding methods used in the existing encoding standards H.264 / AVC and HEVC: for min{D}s.t.R≤R T Use the Lagrangian multiplier method to transform into an unrestricted form min{J}, where J=D+λR, where J is the Lagrange cost and λ is the Lagrange factor. Since the rate-distortion curve is a convex func...

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Application Information

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IPC IPC(8): H04N19/147H04N19/19
Inventor 朱策李帅高艳博周益民
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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