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Sivaranjani, R.
- Modified NLM Model for Despeckling Ultrasound Images Using FCM Clustering Based Pre Classification and RIBM
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Authors
Affiliations
1 Department of Electronics and Communication, K.S. Rangasamy College of Arts and Science, IN
2 Department of Electronics and Communication, Government Arts College, Dharmapuri, IN
3 Department of Information Technology, Arignar Anna Government Arts College, IN
4 Department of Mathematics, K.S.R. College of Arts and Science for Women, IN
1 Department of Electronics and Communication, K.S. Rangasamy College of Arts and Science, IN
2 Department of Electronics and Communication, Government Arts College, Dharmapuri, IN
3 Department of Information Technology, Arignar Anna Government Arts College, IN
4 Department of Mathematics, K.S.R. College of Arts and Science for Women, IN
Source
ICTACT Journal on Image and Video Processing, Vol 8, No 3 (2018), Pagination: 1708-1715Abstract
Speckle noise is an inherent characteristic of ultrasound which reduces the classification accuracy of computer aided diagnosis (CAD) systems. A modified non local means (NLM) filter for despeckling ultrasound images is proposed in this article. The proposed NLM model utilizes a preclassification method in which the feature vectors of the input image are constructed using moment invariants and then they are clustered using fuzzy c means (FCM) algorithm. The rotationally invariant block matching (RIBM) algorithm is applied among the blocks within each cluster instead of the entire image. This intra cluster block matching reduces computational complexity of NLM process without the elimination of any pixel candidate. Further, the rotationally invariant moment distance measure improves the noise reduction performance of the algorithm by increasing the chance of getting more similar candidates for NLM process. Extensive experiments are conducted using synthetic images, phantom images and ultrasound images. The method is comparatively evaluated with other denoising methods using statistical parameters such as MSE, PSNR, SSIM, EPI and ENL. The quantitative results suggested that the proposed method outperforms other four state of the art methods in despeckling and preservation of image details.Keywords
Speckle Noise, Non Local Means, Fuzzy C Means, Ultrasound, CAD Systems.
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