The De-noising of the Ultrasound Medical Image with Threshold Functions Based on Tree-structure Wavelet Analysis
Jianli Zhou · 2005
There were inherent speckle noises in the ultrasound medical image. Th e tree-structure wavelet had higher resolution than the conventional wavelet. Th erefore, the ultrasound medical image was discomposed to the tree-structure wave let domain. Then its coefficients were shrunk with the three methods of hard thr eshold, soft threshold, and semi-soft threshold function differently for the ima ge de-noising. The result indicated that the semi-soft threshold was the effecti ve function method. The speckle noise in the original image was removed efficien tly and at the same time the image details were reserved.