基于DCT域的高压缩图像去块效应算法

被引：5

作者：

谢胜利

石敏

机构：

[1] 华南理工大学电子与信息学院

来源：

控制理论与应用 | 2006年 / 01期

基金：

广东省自然科学基金;

关键词：

块离散余弦变换; 方块效应; 人类视觉系统; 后滤波;

D O I：

暂无

中图分类号：

TN919.8 [图像通信、多媒体通信];

学科分类号：

摘要：

块离散余弦变换(B lock D iscrete Cosine Transform)的主要缺点是在低比特率时其恢复图像的块边界上会出现明显可见的方块效应,降低了图像的视觉质量.为了尽量消除块效应并保护图像的边缘信息提出了一种基于DCT域的块效应消除算法.该算法充分利用了人类视觉系统(Hum an V isual System)特性,建立了块效应模型并给出一个简便的检测边缘标准,对于平滑区,对影响块效应的参数进行修正,然后用线性函数块代替阶跃函数块去除块效应,最后再对更新块和纹理区在DCT域中进行后滤波.仿真结果验证了本文算法的有效性.

引用

页码：139 / 142+147 +147

页数：5

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