小波阈值去噪改进算法研究

提出了一种基于传统阈值去噪法的新的阈值函数,新阈值函数表达式简单易于计算,它既克服了硬阈值函数不连续的缺点,同时又克服了软阈值函数中估计小波系数与分解小波系数之间存在着恒定偏差的缺陷,它具有硬、软阈值函数不可比拟的灵活性。仿真实验结果表明,新的阈值函数的去噪效果无论是在视觉效果上,还是在信噪比增益均优于传统的硬、软阈值方法。

Research of improved algorithm of de-noising in wavelet threshold

A new thresholding function is presented based on the traditional wavelet threshold method Its expression is simple and easy to calculate and overcomes the shortcoming of the hard thresholding method with discontinuous function.At the same time,it overcomes the shortcoming that there is an invariable dispersion between the estimated wavelet coefficients and the decomposed wavelet coefficients of the soft thresholding method.The new threshold function is more elastic than the hard and soft threshold function.Simulation results show that：both the visual effects and the PSNR gains are superior to the traditional method of the soft and hard threshold.