We select four layers of db4 wavelet as mother wavelet, and add a factor to the modified project which can reduce the fixed deviation in the thresholding function.
我们选取了四层的db4小波作为母小波函数。 在改进的阈值函数中加入调整因子α,减少了软阈值方法中产生的恒定偏差,提高的重构精度。
参考来源 - 语音编码中的小波去噪算法研究This new thresholding function overcomes the shortcoming that there is an invariable dispersion between the estimated wavelet coefficients and the decomposed wavelet coefficients of the soft2-thresh olding method.
新阈值函数克服了软阈值函数中小波系数估计和原系数之间的具有固定偏差的缺点。
参考来源 - 一种基于小波变换的图像去噪算法与实现—《电脑知识与技术·学术交流》—2008年第26期—龙源期刊网·2,447,543篇论文数据，部分数据来源于NoteExpress
Simulations show that the improved soft-thresholding function is obviously better than the other three improved thresholding functions in terms of SNR and MSE.
仿真实验显示：无论是信噪比还是最小平方误差，改进的软阈值函数比其它三种改进的阈值函数的效果都要好一些。
A new fuzzy membership function is defined in the light of requirements of image thresholding which can overcome the influence on segmentation caused by the classical s function.
算法针对图像阈值化分割的要求构造了一种新的模糊隶属度函数，克服了传统s -函数带宽对分割效果的影响。
The background samples are chosen by thresholding inter-frame differences, and the Gaussian kernel density estimation is used to estimate the probability density function of background intensity.
通过相隔固定的帧差值阅值化得到背景样本值，并采用高斯核密度估计方法计算背景灰度的概率密度函数。
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