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2015 ; 4
(ä): 775
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Twofold processing for denoising ultrasound medical images
#MMPMID26697285
Kishore PVV
; Kumar KVV
; Kumar DA
; Prasad MVD
; Goutham END
; Rahul R
; Krishna CBSV
; Sandeep Y
Springerplus
2015[]; 4
(ä): 775
PMID26697285
show ga
Ultrasound medical (US) imaging non-invasively pictures inside of a human body
for disease diagnostics. Speckle noise attacks ultrasound images degrading their
visual quality. A twofold processing algorithm is proposed in this work to reduce
this multiplicative speckle noise. First fold used block based thresholding, both
hard (BHT) and soft (BST), on pixels in wavelet domain with 8, 16, 32 and 64
non-overlapping block sizes. This first fold process is a better denoising method
for reducing speckle and also inducing object of interest blurring. The second
fold process initiates to restore object boundaries and texture with adaptive
wavelet fusion. The degraded object restoration in block thresholded US image is
carried through wavelet coefficient fusion of object in original US mage and
block thresholded US image. Fusion rules and wavelet decomposition levels are
made adaptive for each block using gradient histograms with normalized
differential mean (NDF) to introduce highest level of contrast between the
denoised pixels and the object pixels in the resultant image. Thus the proposed
twofold methods are named as adaptive NDF block fusion with hard and soft
thresholding (ANBF-HT and ANBF-ST). The results indicate visual quality
improvement to an interesting level with the proposed twofold processing, where
the first fold removes noise and second fold restores object properties. Peak
signal to noise ratio (PSNR), normalized cross correlation coefficient (NCC),
edge strength (ES), image quality Index (IQI) and structural similarity index
(SSIM), measure the quantitative quality of the twofold processing technique.
Validation of the proposed method is done by comparing with anisotropic diffusion
(AD), total variational filtering (TVF) and empirical mode decomposition (EMD)
for enhancement of US images. The US images are provided by AMMA hospital
radiology labs at Vijayawada, India.