MANOJ DIWAKAR,RAJ SHREE,UP INDIA INDIA,PRABHISHEK SINGH,UP INDIA INDIA
申请号：
IN201711042684
公开号：
IN201711042684A
申请日:
2017.11.28
申请国别(地区):
IN
年份:
2017
代理人:
摘要：
The presented invention is based on hybrid approach including homomorphic and non-homomorphic filtering for despeckling the ultrasound images using fusion. The framework provides the solution to the problem of the presence of speckle noise in the ultrasound images by parallel processing the same speckled images at the same time using DWT based wavelet decomposition and reducing the speckle noise by thresholding and then fusing them into an enhanced despeckled SAR image. The two parallel processes include homomorphic and non-homomorphic filtering. The speckle reduction framework uses db2 based 2D-DWT to n level of decomposition. The wavelet decomposition is experimented at the 3-to-7 level and fixed at that level where the results are obtained best. Here one single speckled ultrasound image is processed in parallel in the wavelet domain. The first thresholding is performed using Bayesian thresholding method and another thresholding is performed using Bivariate thresholding method while the low-frequency details are fused using average operation based on method noise thresholding. The updated low and high-frequency details are directed to IDWT for enhanced results. The developed framework is validated on simulated as well as on real speckled ultrasound images and the results are verified using structural similarity index, peak signal to noise ratio, an equivalent number of looks and noise variance estimation.
