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요약정보
基于非局部自相似性的图像去噪算法研究 / Research on Image Denoising Algorithm Based on Non-Local Self-Similarity
Resource Type
Academic Journal
Authors
郭昕刚
;
许连杰
;
霍金花
;
程超
;
GUO Xin-gang
;
XU Lian-jie
;
HUO Jin-hua
;
CHENG Chao
Source
计算机仿真 / Computer Simulation
. 39(9):364-475
Subject
图像去噪
加权核范数
噪声估计
非局部自相似性
Language
Chinese
ISSN
1006-9348
Online Access
Find it @ DONGA
초록
为解决加权核范数最小化(WNNM)算法在计算图像块相似度时易受噪声影响的问题,同时又能更大程度的利用图像的非局部自相似性(NSS),提出一种新的基于NSS的图像去噪算法.先引入像素级NSS先验来获得更加精确的相似块矩阵,并基于此矩阵提出一种噪声水平估计方法.基于哈尔变换和维纳滤波技术对噪声图像进行预处理,对预处理图像进行噪声水平估计,用估计得到的噪声方差来归一化WNNM算法的保真项,利用WNNM算法对预处理图像中的残余噪声及伪影做进一步去噪处理.实验结果表明,与当前主流的KSVD、BM3D、WNNM、PCLR和NCSR算法相比,经所提算法处理后的图像不仅PSNR和SSIM值均有所提升,而且主观视觉效果更佳.
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