Despeckling of SAR Images Using BEMD-Based Adaptive Frost Filter

Abstract

In image processing, removal of speckle noise from a satellite image is a challenging task for the researchers. There are various approaches for speckle noise reduction. Generally, the speckle noises are scattered, in satellite images, medical images and synthetic aperture radar (SAR) images. This paper introduces a bidimensional empirical mode decomposition (BEMD)-based adaptive filtering method for despeckling of SAR image. The noisy SAR image is decomposed into different bidimensional intrinsic mode function (BIMF) levels using BEMD and then filtering is performed on the first BIMF level, as it contains the high-frequency noise component. This adaptation process effectively filters out the noisy image component without destroying the original image component. A BEMD-based adaptive Frost filter is introduced in this paper for despeckling of SAR images. The despeckling performances of our proposed filtering method are further analyzed by visual evaluation and also using performance parameters comparatively. Our reconstructed images show better performance quantitatively and qualitatively compared to other filters.

Review on nontraditional perspectives of synthetic aperture radar image despeckling

“…4,31 After that, methods like 1,3 also show great results. The results of 29,34,38 are also satisfactory. While rest of the methods shows below satisfactory results.…”

“…Based on NV values of, 1,3,31 it can be easily said that speckle reduction is well performed by these methods. The methods 31,34,38 shows satisfactory result in terms of speckle reduction. Based on MSE values in Table 2, it can be said that 4,31 3,4,31 presents the best results due to higher values.…”

“…This detailed comparison is performed on some prevalent methods. 1,3,4,29,31,34,38,39,46,54,[62][63][64][65][66][67]…”

“…54 Fig. 6 Despeckling results (a) 2018, 1 (b) 2020, 3 (c) 2021, 4 (d) 2022, 29 (e) 2022, 31 (f) 2022, 34 (g) 2021, 38 (h) 2021, 39 (i) 2021, 46 and (j) 2019. 54 Singh, Shankar, and Diwakar: Review on nontraditional perspectives of synthetic aperture radar image.…”

“…Figures 5 and 6 show the despeckling result of some of efficient latest nontraditional methods. 1,3,4,29,31,34,38,39,46,54 This comparison is made based on the visual quality of despeckling results and different metrics used for the performance analysis of these methods. The speckled SAR images taken for reference for the despeckling demonstration are shown in Figs.…”