A New Computationally Improved Homomorphic Despeckling Technique of SAR Images

Prabhishek Singh, Raj Shree

Abstract


Speckle noise is the universal distortion problem in synthetic aperture radar (SAR) images. Despeckling method resolves this problem. This article presents an improved and enhanced homomorphic filtering technique using wiener filter to avoid blurring and to increase the computational time of execution. The proposed method is enhanced by applying log transform after the discrete wavelet transform (DWT) only at the detailed part. This saves the overall time of computational process and the results are also satisfactory and easily acceptable. This scheme is proposed in db2 type wavelet transform. Wiener filter is applied on the approximate part. The performance of the scheme is evaluated by calculating PSNR, SSIM and computational time. The performance of the resulting improved homomorphic filtering technique is compared with some standard methods and filters, and it shows better results in terms of numerical and visual comparison.

Keywords: homomorphic filtering; dwt; wiener filter; speckle noise; SAR image

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DOI: https://doi.org/10.26483/ijarcs.v8i3.3122

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