Threshold function usually have a hard threshold function, soft thresholding function, semi-soft threshold function, the improved thresholding function, a lot of scholars to verify the improved threshold function of wavelet transform processing effect, and the feasibility and effectiveness,
On the other hand, for the selection of threshold value, including the iterative threshold selection, global threshold method, Otsu threshold selection, minimum error threshold selection method, adaptive threshold selection is usually selected fixed threshold,
Finally through the peak signal to noise ratio, root mean square error and so on to verify the feasibility and effectiveness of the one method,
Attach the matlab source code file reference,
