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- The WT coefficient disposed by the compromise of the hard and soft threshold method can reform its continuity on the threshold and guarantee the reconstituted single unable to surge, also can make the signal error smallest. 该方法将小波系数经过软硬阈值折衷法处理后,可以改善小波系数在阈值处的连续性,使重构信号不会振荡,又使变换后的重构信号与实际信号误差最小。
- soft threshold method 软阈值法
- Denoise using soft threshold is simple and convenient. 采用软阈值除噪,算法简单实用。
- The one dimension wavelet transform was introduced and the method of the hard threshold and the soft threshold that is used in wavelet de noising. Four kinds of rules of assessing threshold are given. 介绍了一维小波变换和用于小波去噪的硬门限和软门限处理方法 ;给出了4种门限估算准则 .
- NDVI Ratio Threshold method defines vegetation greenup as the period beginning at the point of the greatest slope. 最大变化斜率方法将NDVI数据斜率角变化最大的点对应的时期作为植物返青期;
- Each detail image is first denoised with ridgelet threshold method, and then decomposed with wavelet. 对细节图像进行脊波阈值去噪处理,然后再进行单层小波分解。
- It overcame the shortcoming of the hard threshold with discontinuous function and solved the problem of the permanent bias in soft threshold function. 该阈值函数不仅克服了硬阈值函数不连续的缺点,并且解决了软阈值函数存在的恒定偏差。
- When the wavelet basis is bior 6.8 and the threshold method is sqwtolog,the effect of denoise quality with wavelet threshold method is the best one. 当小波基为bior 6.;8;sqtwolog阈值规则时;其消噪效果最优
- A new adaptive threshold method is proposed ,which combines the extrem method with the threshold and the barycenter method . 又讨论了常用的各种光刀提取法的基础上,提出了一种光刀中心自适应阈值提取法。
- A multi-scale threshold method in accordance with fixed wavelet threshold, and an improved method on wavelet wiener filter were proposed. 摘要针对固定小波阈值提出了多尺度阈值方法,对小波维纳滤波提出了改进方法。
- In this paper,in order to improve the contrast of a virus image,the arithmetic of MDL wavelet soft threshold denoising associated with blind deconvolution is used. 本文介绍了应用MDL小波软阈值去噪结合盲目反卷积来实现病毒原图像的恢复,以达到对比度提高的效果。
- A recursively increasing threshold method for the segmentation of laser scanning confocal microscopic (LSCM) biomedical images is presented. 提出了用于激光共焦显微生物医学图象分割的循环递增阈值分割法。
- As for the stable stochastic noise component linearly superposed on the median series,it is smoothed by means of the default soft threshold wavelet de-noising. 对线性叠加在中值系列中的平稳随机噪声;用默认软阈值小波消噪平滑中值序列中的随机噪声分量.
- The experiment results show that the adaptive threshold method improves the adapt of fractal quadtree coding in wavelet domain. 仿真实验结果表明,这一自适应门限的编码方法提高了小波分形四叉树图像压缩方法的适应性。
- Based on Wavelet Packet Decomposition (WPD) , Entropy Threshold Method (ETM) has been put forward to reject the Discrete Spectrum Interference (DSI) in on-line PD monitoring. 首次提出用于抑制局部放电在线监测中周期性窄带干扰的小波包变换熵阈值法(ETM)。
- The paper makes a comparison study among the traditional soft threshold,hard threshold and several kinds of spacial denoising methods by the performance evaluation criteria of PSNR and smooth index. 并以峰值信噪比和平滑指数等作为评价指标,与传统的软阈值、硬阈值以及几种空域滤波方法进行了比较。
- It is shown that better de-noising effect are achieved by using the wavelet package soft threshold method.These methods have a significant foreground in de-noising of passive sonar. 该研究在分析对比的基础上进行小波包软阈值去噪取得了较好的效果,对被动声纳降噪提供了较好的应用前景。
- METHODS: First, global threshold method was used to divide the image into metal and streak artifact part. 方法:首先,利用全局阈值分割的方法把原图分割为金属部分和条状伪影部分。
- Statistics characters of the noises that filtered by wavelet threshold method and 21-point average method show that they are independent distribution and similar to Gauss distribution. 通过对滤除噪声的特性分析发现;小波方法和21点平均法滤除的噪声具有独立分布特性;且类似高斯分布.
- 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。