A LS-SVM-Based Bit Allocation Algorithm

ZHANG Zhong-wei

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A LS-SVM-Based Bit Allocation Algorithm

更新时间：2025-07-16

- A LS-SVM-Based Bit Allocation Algorithm
- Acta Electronica Sinica Vol. 35, Issue 4, Pages: 756-760(2007)
- 作者机构：
  
  1. 中国科学院空间科学与应用研究中心,北京,100080
  2. 中国科学院空间科学与应用研究中心北京,100080
- 作者简介：
- 基金信息：
- DOI：
  CLC： TP919.8
- Published：2007
- 稿件说明：
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ZHANG Zhong-wei. A LS-SVM-Based Bit Allocation Algorithm[J]. Acta Electronica Sinica, 2007, 35(4): 756-760.
DOI：

ZHANG Zhong-wei. A LS-SVM-Based Bit Allocation Algorithm[J]. Acta Electronica Sinica, 2007, 35(4): 756-760. DOI：

摘要

Q2算法是新一代国际视频编码标准MPEG-4的标准码率控制算法

但在低码率和低延迟的实时视频通信中

Q2算法往往会导致编码图像质量产生剧烈的波动

大大降低了信宿端重建视频的视觉效果.为此

本文从机器学习的角度出发

提出了一种以最小二乘支持向量机在线建模的比特分配算法

用新算法取代Q2中的比特分配算法

设计出一个改进的Q2码率控制方案.实验仿真结果表明:与原始Q2方案相比

改进后的Q2码率控制方案取得了更加平稳、更加均衡的图像质量

极大地提高了视频通信的视觉质量.

Abstract

MPEG-4 is a new ISO standard for video coding.However

its rate-control scheme

would results in the video quality fluctuation at the low-bit and low-delay video communication.The bit-allocation algorithm of Q2 is analyzed

and its disadvantages are presented.Based on Least Square Support Vector Machine (LS-SVM)

a novel bit-allocation algorithm is proposed to improve the bit-allocation accuracy.Subsequently

the proposed algorithm is used to improve Q2.Compared with Q2

the improved Q2 significantly decreases the video quality fluctuation

and improves the picture visual quality.Experimental results verify the proposed bit-allocation algorithm.

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