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Adaptive qp Offset adjustment method for low-delay coding

A low-delay encoding and adjustment method technology, applied in the field of adaptive QPOffset adjustment, can solve the problems of not taking into account the change of video source content and the degradation of encoding performance, etc.

Inactive Publication Date: 2017-11-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The layered QP Offset technology that is preset and keeps a fixed value does not take into account the change of the content of the video source, which will cause a decrease in encoding performance

Method used

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  • Adaptive qp Offset adjustment method for low-delay coding
  • Adaptive qp Offset adjustment method for low-delay coding
  • Adaptive qp Offset adjustment method for low-delay coding

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Embodiment Construction

[0038] The present invention will be further described below with reference to the accompanying drawings and examples, and the embodiments of the present invention include but not limited to the following examples.

[0039] figure 1 It is a flow chart of the main steps of the adaptive QP Offset adjustment method, specifically including:

[0040] Step 101: Calculation of source distortion of coding units. Extract all coding units U of the current frame t,i The pixel value F t,i , using the formula

[0041]

[0042] Calculate the source distortion of all coding units in the current frame

[0043] Step 102: Frame-level motion compensation distortion estimation. According to the source distortion of all coding units in the current frame obtained in step 101 use the formula

[0044]

[0045] Computes frame-level motion-compensated distortion

[0046] Step 103: Estimating the strenuous intensity of exercise. According to the frame-level motion compensation distor...

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Abstract

The invention discloses an adaptive QP Offset adjustment method for low-delay encoding, belongs to the technical field of video encoding, and relates to an adaptive QP Offset adjustment method under a low-delay (low-delay, LD) encoding structure. The present invention considers the intensity of motion of the video source into the allocation strategy of QP Offset, first constructs the source distortion time domain propagation chain, and then calculates the intensity of the motion of the current encoded frame and its influence on subsequent encoded frames through statistics of source distortion , and finally gives the adaptive QP Offset value of the current coded frame.

Description

technical field [0001] The invention belongs to the technical field of video coding. Specifically, it relates to an adaptive QP Offset adjustment method under a low-delay (low-delay, LD) coding structure. Under the limit condition of the maximum QP Offset, the object of the present invention is to provide the quantization parameter (QP) value of the frame coding through an adaptive adjustment method, so as to improve the coding performance. Background technique [0002] Most of the current mainstream video encoders use layered QP Offset settings for encoding. This layered QP Offset is set according to empirical values ​​during the encoding process and does not change during the encoding process. In the process of video encoding, image frames with severe motion in the source content have far less impact on subsequent image frames than those with slow motion, so image frames with severe motion should be assigned a larger QP Offset, and image frames with slow motion A smalle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/126H04N19/146
Inventor 周益民朱策钟敏罗敏珂
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA