摘要
提出一种基于粒子群优化的多小波图像降噪方法。该方法首先根据图像降噪的特点,采用粒子群算法优化CL多小波的前置滤波器,实现了图像多小波变换的自适应预滤波;接着对一幅含噪声图像进行多小波分解,根据多小波分解后的能量分布特性,对小波系数进行阈值处理;后经多小波反变换,得到重构图像。实验表明,本文方法的客观性能(PSNR)和主观效果均优于传统小波去噪方法,同中值滤波和维纳滤波相比也有绝对优势。
An approach of image denoising in multi-wavelet domain based on particle swarm optimization was proposed. Firstly, particle swarm optimization was used to construct the adaptive pre-filters of CL multi-wavelet transform. Then noised image was decomposed by multi-wavelet transform and the coefficients were processed using threshold scheme according to the energy distribution of coefficients. Finally, denoised image could be obtained by inverse multi-wavelet transform. Experiments show, the proposed approach outperforms traditional wavelet denoising methods in terms of PSNR and visual effects. Moreover, the approach is beyond median filter and Wiener filter obviously.
出处
《光电工程》
CAS
CSCD
北大核心
2011年第11期119-123,共5页
Opto-Electronic Engineering
基金
宁波市自然科学基金项目(2011A610192)
浙江省教育厅计划项目(Y200906750)
关键词
多小波
粒子群优化
图像降噪
multi-wavelet
particle swarm optimization
image denoising