基于小波阈值收缩的图像降噪

摘要

The image denoising experiment, using biorthogonal wavelet and applying VisuShrink thresholds and BayesShrink thresholds,is conducted to images mixed with Gaussian white noise through the hard threshold function and the soft threshold function respectively. The results show that denoising effect of the hard VisuShrink threshold is better than that of soft VisuShrink threshold~ the denoising effect of the soft BayesShrink threshold is better than that of hard BayesShrink~and BayesShrink can have a better denoising effect only in the soft threshold function.%采用双正交小波,利用VisuShrink阈值和BayesShrink阈值,分别通过硬阈值函数和软阈值函数对混入高斯白噪声的图像进行去噪实验.结果表明,硬VisuShrink阈值的降噪效果好于软VisuShrink阈值,软BayesShrink阈值的降噪效果好于硬BayesShrink阈值,并且BayesShrink阈值只有在软阈值函数下才能取得很好的降噪效果.