Medical CT image denoising method based on nonsubsampled Contourlet transform

Computer Engineering and Applications ›› 2012, Vol. 48 ›› Issue (27): 150-154.

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Medical CT image denoising method based on nonsubsampled Contourlet transform

WANG Hao1，2, KANG Xiaodong1, LIU Lingling1, GENG Jiajia1

1.School of Medical Imaging, Tianjin Medical University, Tianjin 300070, China
2.Department of Interventional Radiology, Affiliated Hospital of Hebei University, Baoding, Hebei 071000, China

Online:2012-09-21 Published:2012-09-24

基于非下采样Contourlet变换的医学CT图像去噪

王昊1，2，康晓东1，刘玲玲1，耿佳佳1

1.天津医科大学医学影像学院，天津 300070
2.河北大学附属医院介入科，河北保定 071000

Abstract

Abstract: To overcome the Contourlet transform non translation invariance and spectrum aliasing defects, this paper presents a method based on nonsubsampled Contourlet transform for medical CT image denoising method. The noisy CT images are conducted by nonsubsampled Contourlet transform. Transform coefficients are obtained from different scales and different directions. Using Context model, subband of each scale and each direction is graded. Different classification uses the corresponding threshold denoising. Experiments show that this method is suitable to processing the medical CT image which contains more Gaussian noise. Compared with other methods, the PSNR value is improved, the image details are better retained, and CT image quality is improved.

Key words: image processing, denoising, nonsubsampled Contourlet transform, Context model

摘要： 为克服Contourlet变换的非平移不变性及频谱混叠等缺陷，提出了一种基于非下采样Contourlet变换的医学CT图像去噪方法。对含噪的CT图像进行非下采样Contourlet变换，得到不同尺度及各个方向上的变换系数，利用Context模型将每个尺度每个方向子带分级，不同分级采用相应的阈值去噪。实验表明，该方法适宜于处理含有更多高斯噪声的医学CT图像，与其他方法相比提高了PSNR值，更好地保留了图像细节，改善了医学CT图像的质量。

关键词: 图像处理, 去噪, 非下采样Contourlet变换, Context模型

WANG Hao1，2, KANG Xiaodong1, LIU Lingling1, GENG Jiajia1. Medical CT image denoising method based on nonsubsampled Contourlet transform[J]. Computer Engineering and Applications, 2012, 48(27): 150-154.

王昊1，2，康晓东1，刘玲玲1，耿佳佳1. 基于非下采样Contourlet变换的医学CT图像去噪[J]. 计算机工程与应用, 2012, 48(27): 150-154.

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Medical CT image denoising method based on nonsubsampled Contourlet transform

基于非下采样Contourlet变换的医学CT图像去噪

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