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- This paper presented a new method based on nonlinear wavelet transform to image de noising. 提出一种新的非线性小波变换去噪方法 .
- Three high frequency parts from wavelet transforms are turned into spherical coordinate, in which it applies the method to image de noising by the wavelet shrinkage parameters based on statistical characteristics. 该方法把线性小波变换后得到的 3个高频分量通过球坐标变换后 ;得到球坐标下 3个分量 ;然后在球坐标中根据图像统计特性设定的收缩因子处理小波收缩去噪 .
- Motivated by the classical gradient inverse weighting filter, this paper proposed a new nonlinear digital filter: a new gradient inverse weighting filter for image de noising. 受经典梯度倒数加权滤波器的启发 ;提出了一种应用于图像去噪的新型非线性数字滤波器 ;称之为新型梯度倒数加权滤波器 .
- After making discrete stationary wavelet transform to an infrared image, de noising is done in the high frequency sub bands with better resolution. 对红外图像进行离散平稳小波变换后 ,对分辨率较好的各高频子带直接利用所提出的去噪方法去噪 ;
- The application of de noising by soft thresholding on wavelet transform to ultrasonic detection echo is discussed. 研究小波变换软阈值去噪方法在超声检测回波处理中的应用。
- In the end,the statistics of the operational volume of wavelet de noising is made. 最后对小波去噪的运算量进行了统计 .
- In this paper,mean threshold is presented on which wavelet packet de noising is studied. 文中提出了平均阈值的概念 ;并在此基础上研究了小波包去噪的效果 .
- It has been proved that the wavelet packet de noising is an effective method prior to wavelet de noising. 仿真结果表明 ,基于平均阈值的小波包去噪是一种有效的去噪方法 ,其效果优于小波去噪
- In analytical chemistry,wavelet transform has been mainly utilized for signal smoothing,de noising and compression. 在分析化学领域中,小波分析也逐渐应用于去噪与平滑、数据压缩等方面。
- The result indicates that the wavelet transform has practical value in the performance of de noising and real time processing. 结果表明 ;小波变换在去噪性能和实时处理方面均具有实用价值 .
- To find the best scheme of wavelet de noising,various parameters that influence the performance of wavelet de noising are studied in this paper. 为了找到最佳的小波去噪方案 ;本文对各种影响小波去噪性能的参数作了比较研究 .
- In this paper, we proposed a method of wavelet image enhancement based on modulus square processing to achieve a better visual effect. 为了更好地保证图像的整体增强效果，该文提出一种基于模平方处理的小波图像增强方法。
- Then an improved method, namely translation invariant de noising was proposed. 在此基础上 ,探讨了对传统的阈值方法的改进 ,即平移不变小波变换去噪法。
- In order to improve the alarm accuracy rate in nuclear power station, this paper adopts Wavelet De noising (WD) method based on statistic characteristics and presents a loose parts alarm method. 针对核电站中检测跌落零件误报警率高的问题，本文对带通滤波后的跌落零件冲击信号应用了基于统计特征的小波去噪方法，并给出了去噪后的跌落零件报警方法。
- The wavelet image coding achieves higher image quality and higher compression ratio than the traditional DCT transform coding. 小波变换图像编码获得了比传统 DCT变换编码更好的图像质量和更高的压缩比。
- Secondly,Maximum A Posteriori(MAP)estimator based on intrascale statistical model is used to restore the noisy wavelet image coefficients. 然后在小波域同层模型中运用最大后验概率估计方法,从有意义系数中恢复出原始系数。
- Zheng Y, Zhou Z H, Zhu W L.A compression algorithm of wavelet image with fast zerotree encoding [J].Journal of UEST of China, 2001, 30 (4): 331-334. [2]郑勇;周正华;朱维乐.;一种快速零树编码的小波图像压缩算法[J]
- Finally, a quadtree-based wavelet image coding method is proposed, which can adapt the property of wavelet image coefficient. 最后，根据小波图像系数特性，采用基于四叉树分裂的小波图像编码方法对三维时/空子带进行编码，以获得更高的压缩效率。
- Also, the Visual Pattern Image Coding (VPIC) method, which is based on the directionality of high-frequency band in wavelet image, is proposed to improve coding efficiency. 同时，根据小波图像的方向性特点，采用了视觉模式图像编码（VPIC）方法，以提高编码效率。
- Compared with[1],the proposed algorithm can be realized without the a priori knowledge about source directions and de noising preprocessing. 与文献 [1]不同 ;算法的实现不需要方位估计的先验知识和协方差矩阵的去噪预处理 .
