J4 ›› 2011, Vol. 49 ›› Issue (02): 164-168.

• 数学 • 上一篇    下一篇

一类自适应扩散方程在乘性去噪中的应用

尹云光1, 李静2, 郭志昌3, 曹杨4   

  1. 1. 吉林大学 计算机科学与技术学院, 长春 130012|2. 中央民族大学 理学院, 北京 100081;3. 哈尔滨工业大学 数学系, 哈尔滨 150001|4. 大连理工大学 数学科学学院, 辽宁 大连 116024
  • 收稿日期:2010-05-17 出版日期:2011-03-26 发布日期:2011-06-14
  • 通讯作者: 郭志昌 E-mail:mathgzc@email.jlu.edu.cn

Application of a Class of Adaptive Diffusion Equationto Multiplicative Denoising

YIN Yunguang1, LI Jing2, GUO Zhichang3, CAO Yang4   

  1. 1. College of Computer Science and Technology, Jilin University, Changchun 130012, China|2. College of Science, Minzu University of China, Beijing 100081, China;3. Department of Mathematics, Harbin Institute of Technology, Harbin 150001, China;4. School of Mathematical Sciences, Dalian University of Technology, Dalian 116024, Liaoning Province, China
  • Received:2010-05-17 Online:2011-03-26 Published:2011-06-14
  • Contact: GUO Zhichang E-mail:mathgzc@email.jlu.edu.cn

摘要:

提出一类自适应扩散方程并将其相应的模型用于乘性去噪, 该类模型能针对乘性噪声的特点, 根据局部梯度信息自适应地选择扩散模式: 其扩散速度和噪声大小成正比, 没有噪声的区域不扩散, 同时结合了热方程各向同性扩散和全变差流各向异性扩散的特点. 理论分析和实验结果表明, 该类模型能自适应地光滑区域内部, 增强边界, 避免阶梯效应.

关键词: 自适应, 乘性去噪, 阶梯效应, 扩散方程

Abstract:

The authors presented a class of adaptive diffusion equations which provide a model for multiplicative denoising. This type of diffusion varies according the local gradient information, adaptively aiming at multiplicative noise. The diffusion speed is proportional to noisy level and there is no diffusion in the domains with no noise. The diffusion result from the proposed model is a combination of isotropic diffusion based on heat equation and anisotropic diffusion based on total variation. Theoretical analysis and experimental results illustrate the effectiveness of the model in removing noise and enhancing edges while avoiding the staircasing effect.

Key words: adaptive, multiplicative denoising, staircase effect; diffusion equation

中图分类号: 

  • O175.2