| 基于小波阈值去噪的收缩函数改进方法 |
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| 引用本文： | 李骜,李一兵,孟霆,叶方. 基于小波阈值去噪的收缩函数改进方法[J]. 计算机工程与设计, 2011, 32(10): 3450-3452 |
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| 作者姓名： | 李骜 李一兵 孟霆 叶方 |
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| 作者单位： | 哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨,150001 |
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| 基金项目： | 哈尔滨市科技创新人才研究专项基金项目(2008RFQXG025); 中央高校基本科研业务费专项基金项目(HEUCF100809) |
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| 摘 要： | 经典的小波去噪方法有软阈值、硬阈值滤波两类。软阈值收缩函数滤波后信号过于平滑,而硬阈值收缩函数滤波后在信号突变处伴有吉布斯现象。因此,提出介于软、硬阈值之间的一种收缩函数,通过其对小波系数的估计,使滤波后的信号在过分平滑与边缘振荡现象之间达到合理的平衡。在分析的基础上,给出了各种方法滤波后的PSNR对比值以及图像。实验结果表明,该方法在去噪的同时既有效地消除了振荡现象,又保留了部分细节信息。
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| 关 键 词： | 小波变换 收缩函数 阈值滤波 峰值信噪比 多分辨率分析 |
Improved method of shrink-function based on wavelet threshold de-noising |
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| LI Ao,LI Yi-bing,MENG Ting,YE Fang. Improved method of shrink-function based on wavelet threshold de-noising[J]. Computer Engineering and Design, 2011, 32(10): 3450-3452 |
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| Authors: | LI Ao LI Yi-bing MENG Ting YE Fang |
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| Affiliation: | LI Ao,LI Yi-bing,MENG Ting,YE Fang(College of Information and Communication Engineering,Harbin Engineering University,Harbin 150001,China) |
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| Abstract: | Classic threshold filtering is composed of the soft threshold and hard threshold.For the soft shrink-function,the filtered signal is excessively smooth.For the hard shrink-function,the filtered signal associated with the Gibbs phenomenon in the signal mutation after filtering.The contraction function presented is between soft and hard.Through its wavelet coefficients modification,the filtered signal reach a reasonable balance between excessively smoothness and edge oscillation.Based on the analysis,the PSNR... |
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| Keywords: | wavelet transform shrink-function threshold filter PSNR analysis with multi-resolution |
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