| 基于改进NL-means算法的显微CT图像降噪 |
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| 引用本文： | 李保磊,杨民,李俊江.基于改进NL-means算法的显微CT图像降噪[J].北京航空航天大学学报,2009,35(7):833-837. |
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| 作者姓名： | 李保磊 杨民 李俊江 |
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| 作者单位： | 北京航空航天大学,机械工程及自动化学院,北京,100191;北京航空航天大学,机械工程及自动化学院,北京,100191;北京航空航天大学,机械工程及自动化学院,北京,100191 |
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| 基金项目： | 北京市教育委员会共建项目专项资助项目;;国家自然科学基金资助项目(60872080);;航天科技创新基金资助项目(CASC0410) |
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| 摘 要： | 显微CT(Computed Tomography)采用微焦点射线源,射线剂量低,CT图像噪声大,对其降噪十分必要.综述了现存主要CT图像降噪算法及其优缺点,介绍了NL(nonlocal)-means算法,根据实验结果分析了其会在图像平滑区域引入人工伪影的不足.根据NL-means算法的不足,在原算法中引入图像的梯度信息,提出了改进的降噪算法,改进算法保持了原算法优良的降噪功能,并能有效抑制人工伪影,且能够提高图像细节对比度,实验结果验证了改进算法的有效性.
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| 关 键 词： | 显微CT 降噪 人工伪影 改进NL-means算法 对比度 |
| 收稿时间： | 2008-06-18 |
Denoising of micro-CT image based on improved NL-means algorithm |
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| Li Baolei,Yang Min,Li Junjiang.Denoising of micro-CT image based on improved NL-means algorithm[J].Journal of Beijing University of Aeronautics and Astronautics,2009,35(7):833-837. |
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| Authors: | Li Baolei Yang Min Li Junjiang |
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| Institution: | School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China |
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| Abstract: | Micro-CT(computed tomography)is based on microfocus X-ray source and the ray dose is low.So the noise level of micro-CT image is big and denoising of the CT image is very necessary.The current main denoising methods for CT image and their advantages and disadvantages were summaried.The NL(nonlocal)-means algorithm was described.According to the experiment result,the disadvantage of NL-meas algorithm that artificial artifact will be introduced in smooth region of CT image was analyzed.Based on the shortage o... |
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| Keywords: | micro-CT ( computed tomography) denoising artificial artifact improved NL( nonlocal) -means algorithm contrast |
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