Subspace-Based Technique for Speckle Noise Reduction in SAR Images

Yahya, Norashikin and Kamel , Nidal and Malik, Aamir Saeed (2014) Subspace-Based Technique for Speckle Noise Reduction in SAR Images. [Citation Index Journal]

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Image-subspace-based approach for speckle noise removal from synthetic aperture radar (SAR) images is proposed. The underlying principle is to apply homomorphic framework in order to convert multiplicative speckle noise into additive and then to decompose the vector space of the noisy image into signal and noise subspaces. Enhancement is performed by nulling the noise subspace and estimating the clean image from the remaining signal subspace. Linear estimator minimizing image distortion while maintaining the residual noise energy below some given threshold is used to estimate the clean image. Experiments are carried out using synthetically generated data set with controlled statistics and real SAR image of Selangor area in Malaysia. The performance of the proposed technique is compared with Lee and homomorphic wavelet in terms of noise variance reduction and preservation of radiometric edges. The results indicate moderate noise reduction by the proposed filter in comparison to Lee but with a significantly less blurry effect and a comparable performance in terms of noise reduction to wavelet but with less artifacts. The results also show better preservation of edges, texture, and point targets by the proposed filter than both Lee and wavelet and less required computational time.

Item Type:Citation Index Journal
Impact Factor:3.467
Subjects:Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Academic Subject One:Academic Department - Electrical And Electronics
Departments / MOR / COE:Centre of Excellence > Center for Intelligent Signal and Imaging Research
ID Code:11510
Deposited By: Ms Norashikin Yahya
Deposited On:28 Apr 2015 02:54
Last Modified:28 Apr 2015 02:54

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