Rate Control Method for Scalable Video Coding Based on Predictive Mode Rate-Distortion Analysis

A predictive mode, video coding technology, applied in digital video signal modification, electrical components, image communication, etc., can solve the problem of inaccurate description of the rate-distortion relationship model, lack of mutual influence between the basic layer and the enhancement layer, and rate-distortion model not considered, etc. question

Active Publication Date: 2017-11-03
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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  • Rate Control Method for Scalable Video Coding Based on Predictive Mode Rate-Distortion Analysis

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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]

[0060]

[0061] In the formula, % is a remainder symbol; ζ ( ) is a remainder constant, and the constant value is determined according to the remainder;

[0062] Step 2, utilize the testing software of scalable video coding standard to carry out scalable coding to ...

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

A code rate control method of scalable video coding based on prediction mode rate-distortion analysis relates to a code rate control method of scalable video coding. In order to solve the problem that the rate-distortion relationship model in the existing 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 the joint base layer and The problem with the rate-distortion model of the enhancement layer. After assigning a value to the quantization step, the present invention selects the optimal coding mode to encode the coding unit, stores the coding result of the coding unit in the enhancement layer; calculates Γj=B_MADactual,j-B_MADpredicted,j in the jth frame in the basic layer; updates E_MADj The coefficients a1 and a2 of the MAD prediction model in = a1×E_MADj-1+a2+a3×Γj; then predict the E_MADj of the next coding unit; update the RD model coefficients and calculate the target coded bit number Rtxt of the next coding unit; calculate The quantization step size of the inter-layer prediction and the quantization step size of the intra-layer prediction are until the coding of all coding units is completed. The invention is applicable to the field of code rate control of scalable 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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Patent Type & Authority Patents(China)
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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