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Coding optimization method and device of medium grain scalable video and information terminal

A technology of video coding and optimization method, which is applied in the field of multimedia information and can solve problems such as limited bandwidth, video quality and real-time direct access

Inactive Publication Date: 2012-07-18
SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a medium-grained quality scalable video coding optimization method, aiming to solve the problem of balancing limited bandwidth, video quality and real-time direct access

Method used

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  • Coding optimization method and device of medium grain scalable video and information terminal
  • Coding optimization method and device of medium grain scalable video and information terminal
  • Coding optimization method and device of medium grain scalable video and information terminal

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Embodiment 1

[0040] figure 1 It shows the implementation process of the medium-granularity quality scalable video coding optimization method provided by Embodiment 1 of the present invention, and the process of the method is described in detail as follows:

[0041] In step S101, a slice layer importance weight vector is defined, and the mass percentage of each slice layer in the quality enhancement layer is calculated.

[0042] As an embodiment of the present invention, in MGS coding, the 16 coefficients in each sub-block data unit are obtained after integer transformation of 4×4 sub-block data, so the importance of each coefficient is different. According to the number of coefficients included in the slice, the slice importance weight vector K=[k1, k2,...ki], i=1, 2, 3...16 is defined. According to formulas (1), (2) and (3), calculate the mass percentage (i.e. the importance of each slice data) k1, k2, ... ki of the quality enhancement layer that each slice occupies;

[0043] ...

Embodiment 2

[0094] Figure 6 The structure of the medium-granularity quality scalable video coding optimization device provided by the second embodiment of the present invention is shown, and for the convenience of description, only the parts related to the embodiment of the present invention are shown.

[0095] The medium granularity quality scalable video coding optimization device can be used in various information terminals equipped with video playback, such as 3G mobile phones, pocket computers (Pocket Personal Computer, PPC), handheld computers, high-definition DVD, notebook computers, etc., can be run on The software unit, hardware unit or combination of software and hardware in these information terminals can also be integrated into these information terminals as an independent pendant.

[0096] The medium granular quality scalable video coding optimization device includes an importance calculation unit 61 , a model construction unit 62 , a video stream bit rate estimation unit 63...

Embodiment 3

[0116] Figure 7 The experimental research platform for the optimization of the coding scheme provided by Embodiment 3 of the present invention is shown. This experiment adopts the standard test sequence provided by the Video Quality Experts Group (VQEG) of ITU as a data source. In the ITU-T standard proposal ITU-T VCEG P206d0 The general SVC (reference software is JSVM9.18) test environment is defined in the document, and the experimental research is carried out on the simulation test platform MobileIP. The experimental platform and process are as follows: Figure 7 shown. The encoding and structure analysis of the H.264 bit stream adopts the compressed video test system MTS4EA of Tektronix Company, which can analyze the image data frame by frame and block in real time, provide a comprehensive semantic tracking file, determine the block by block judgment of the encoder, and generate Statistical analysis data.

[0117] Video quality evaluation can be attributed to the evalua...

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Abstract

The invention applies to the multimedia information field, and provides a coding optimization method of a medium grain scalable video, a coding optimization device of the medium gain scalable video, and an information terminal. The method comprises the following steps: defining an importance weight vector of a sheet; calculating the mass percentage of each sheet based on a mass enhancing layer; establishing a relation curve of the code rate and the mass percentage according to the mass percentage of the sheet in the mass enhancing layer and the bit number actually required for coding the sheet; and structuring a rate-distortion model of the medium grain scalable sheet; estimating the video stream code rate according to the structured rate-distortion model of the medium grain scalable sheet and rate-distortion models of preset I, P and B frames; and obtaining an optimal solution controlled by the code rate within the target medium grain scalable code rate interval by a greedy algorithm according to the estimated video stream code rate. In the invention, a medium grain scalable video coding scheme is optimized by the greedy algorithm, therefore, the problems due to the limited bandwidth and the video quality can be effectively solved, and the image coding quality can be improved.

Description

technical field [0001] The invention belongs to the field of multimedia information, and in particular relates to a medium granularity quality scalable video coding optimization method, device and information terminal. Background technique [0002] Scalable Video Coding (Scalable Video Coding, SVC) focuses on improving the quality of service of streaming media transmission through layered technology, improving the system's fault tolerance and network adaptability. The scalability of video coding is divided into space scalability, time scalability and quality scalability. Among them, quality scalability is mainly divided into coarse-grained quality scalability (Coarse Grain Scalability, CGS), medium-grained quality scalability (Medium Grain Scalability, MGS) and fine-grained (Fine Grain Scalability, FGS) quality scalability. Compared with CGS, MGS provides higher flexibility. Moreover, MGS coding can provide rate-distortion results similar to FGS while significantly reducin...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/32H04N7/64H04N19/146H04N19/147H04N19/30H04N19/89
Inventor 柳伟
Owner SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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