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Prediction mode rate-distortion analysis based code rate control method for extensible video coding

A prediction mode, video coding technology, applied in the fields of digital video signal modification, electrical components, image communication, etc., can solve the problem that the rate-distortion relationship model cannot be accurately described, the base layer and the enhancement layer lack mutual influence, and the rate-distortion model is not considered, etc. question

Active Publication Date: 2015-07-22
HARBIN INST OF TECH
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Problems solved by technology

[0006] The present invention aims to solve the problem that the rate-distortion relationship model in the existing code rate control technology cannot accurately describe the rate-distortion relationship of the SVC standard, the existing rate-distortion model does not consider the mutual influence between the base layer and the enhancement layer, and lacks joint The problem of the rate-distortion model of the base layer and the enhancement layer, and a rate-control method for scalable video coding based on predictive mode rate-distortion analysis

Method used

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  • Prediction mode rate-distortion analysis based code rate control method for extensible video coding
  • Prediction mode rate-distortion analysis based code rate control method for extensible video coding
  • Prediction mode rate-distortion analysis based code rate control method for extensible video coding

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specific Embodiment approach 1

[0057] Specific implementation mode one: combine figure 1 Describe this embodiment, the code rate control method of scalable video coding based on predictive mode rate-distortion analysis, comprises the following steps:

[0058] Step 1. If the current coding unit is the first coding unit in the first frame in the enhancement layer, read the initial value InitialQP of the quantization parameter QP from the coding configuration file, according to formula (1-1) and formula (1- 2) Calculate and assign to the quantization step size of the inter-layer prediction according to the InitialQP The initial value of and the quantization step size of intra-layer prediction initial value; then execute step 2;

[0059] Q step inter = 2 InitialQP 6 ζ ( InitialQP % 6 ) - ...

specific Embodiment approach 2

[0104] Specific implementation mode two: the remainder constants ζ(0)=0.625, ζ(1)=0.6875, ζ(2)=0.8125, ζ(3)=0.875, ζ(4)=1.0 described in Step 1 of this embodiment and ζ(5)=1.125; · in ζ(·) represents the remainder, and ζ( ) represents the remainder symbol.

[0105] Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0106] Embodiment 3: The test software using the scalable video coding standard described in step 2 of this embodiment is the test software JSVM of the scalable video coding standard.

[0107] Other steps are the same as in the second embodiment.

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Abstract

The invention relates to a code rate control method for extensible video coding, in particular to a prediction mode rate-distortion analysis based code rate control method for extensible video coding, and aims to solve the problem that rate-distortion relation models in the prior code rate control technology cannot describe rate-distortion relations under SVC (scalable video coding) standards, the problem that mutual influences between a basic layer and a reinforcement layer are not considered by existing rate-distortion models and the problem of lack of rate-distortion models for combining the basic layer with the reinforcement layer. The prediction mode rate-distortion analysis based code rate control method includes selecting an optimal coding mode to code a coding unit after valuating a quantization step size, and storing a coding result of the coding unit of the reinforcement layer; calculating gamma j in a jth frame of the basic layer, wherein gamma j=B_MADactual,j-B_MADpredicted,j; updating coefficients a1 and a2, in E_MADj=a1*E_MADj-1+a2+a3*gamma j, of a MAD prediction model; predicting E_MADj of a next coding unit; calculating a target coding bit number Rtxt of the next coding unit after updating RD model coefficients; calculating an interlayer predicted quantization step size and an intra-layer predicted quantization step size until coding of all coding units is completed. The prediction mode rate-distortion analysis based code rate control method is applicable to the field of code rate control of extensible video coding.

Description

technical field [0001] The invention relates to a code rate control method of scalable video coding. Background technique [0002] The SVC standard is based on the H.264 / AVC video codec standard and is composed of the ITU Telecommunication Standardization Sector (ITU-T) Video Coding Experts Group (VCEG) and the International Organization for Standardization (ISO) Moving Picture Experts Group (MPEG). The international scalable video coding standard jointly developed by the Joint Video Experts Team (JVT). While maintaining high-efficiency compression, the code stream generated by the SVC encoder can be scalable in time (frame rate), space (resolution) and video quality (signal-to-noise ratio), that is, the code stream generated by one encoding Videos with different frame rates, resolutions and quality levels can be decoded. Under the condition of given transmission bandwidth or storage space, the code rate control algorithm utilizes coding tools to effectively allocate and u...

Claims

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Application Information

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IPC IPC(8): H04N19/147H04N19/30H04N19/103
Inventor 卢鑫金雪松胡悦肖楠郭俊汐
Owner HARBIN INST OF TECH
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