A method of medical ultrasonic image denoising and enhancement based on wavelet transform
Min Guo · Zhongguo yixue yingxiang jishu · 2006
Objective A method of medical ultrasonic images denoising and enhancement based on wavelet transform is explored. Methods A integrated speckle suppression method for medical ultrasound image based on wavelet transform was presented. Firstly, logarithmic transform was carried out to the medical ultrasound image. Multiplicative noises were transformed into additive ones. Secondly, the image was decomposed into low frequency and high frequency sub-band images by wavelet transform. Nonlinear soft threshold denoising and enhancement were carried out to the multiscale high frequency sub-band images. Finally, the inverse wavelet transform and the exponential transform were processed. Results The speckle noises in the original image were removed efficiently and the image edge details were reserved. Conclusion The method is efficiently to denoising speckle noises and reserving edge details in medical ultrasonic image.