| 利用多小波的改进多层阈值对超声图像降噪 |
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| 引用本文： | 农京辉,王锦莉,刘爱林,王修信.利用多小波的改进多层阈值对超声图像降噪[J].计算机工程与应用,2009,45(22):138-139. |
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| 作者姓名： | 农京辉 王锦莉 刘爱林 王修信 |
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| 作者单位： | 1. 广西师范大学计算机科学与信息工程学院,广西桂林,541004
2. 湖南科技学院电子与物理系,湖南永州,425100 |
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| 基金项目： | 国家自然科学基金，广西科学基金资助项目 |
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| 摘 要： | 医学超声图像存在特有的斑点噪声,大大降低了图像质量,必须进行降噪处理。多小波具有比单小波分解更加精确、去噪效果更好的特点。对超声图像进行分形插值多小波分解,根据多小波分解后的能量分布特性,提出了改进多层阈值与模糊聚类相结合方法,将小波系数模糊聚类分成噪声和信号两类,然后在不同尺度对信号小波系数进行不同阈值萎缩处理,实现降噪目的。结果表明该方法优于硬阈值和软阈值法,可有效地降低图像斑点噪声并保留图像细节。
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| 关 键 词： | 图像降噪 分形插值多小波 改进多层阈值 模糊聚类 |
| 收稿时间： | 2009-2-2 |
| 修稿时间： | 2009-4-1
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Ultrasound image de-noising using modified multilevel threshold |
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| NONG Jing-hui,WANG Jin-li,LIU Ai-lin,WANG Xiu-xin.Ultrasound image de-noising using modified multilevel threshold[J].Computer Engineering and Applications,2009,45(22):138-139. |
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| Authors: | NONG Jing-hui WANG Jin-li LIU Ai-lin WANG Xiu-xin |
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| Affiliation: | NONG Jing-hui1,WANG Jin-li1,LIU Ai-lin2,WANG Xiu-xin11.College of Computer Science , Information Technology,Guangxi Normal University,Guilin,Guangxi 541004,China 2.Department of Electronic Engineering , Physics,Hunan University of Science , Engineering,Yongzhou,Hunan 425100,China |
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| Abstract: | There are inherent speckle noises in the medical ultrasound image.Image denoising is necessary for lower image quality.Multiwavelet has higher resolution and better denoising effect than scalar wavelet.Therefore,the modified multilevel threshold with fuzzy clustering is proposed based on the energy distribution of multiwavelet coefficients.First the ultrasound image is discomposed to multiwavelet domain.Then its coefficients are separated into noise and signal classes with fuzzy clustering.The signal coeffi... |
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| Keywords: | image denoising fractal interpolation multiwavelet modified multilevel threshold fuzzy clustering |
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