SPECKLE REDUCTION IN SAR IMAGES BASED ON THE SOFT THRESHOLDING OF CURVELET COEFFICIENTS

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ZAKERI F.; VALADAN ZOEJ M.J.; SAHEBI M.R.

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Journal: JOURNAL OF GEOMATICS SCIENCE AND TECHNOLOGY Year:2014 | Volume:4 | Issue:2 Page(s): 25-35

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Title

SPECKLE REDUCTION IN SAR IMAGES BASED ON THE SOFT THRESHOLDING OF CURVELET COEFFICIENTS

Author(s)

ZAKERI F. | VALADAN ZOEJ M.J. | SAHEBI M.R. | Issue Writer Certificate

Keywords

CURVELET TRANSFORMQ2

RADAR IMAGESQ2

HARD AND SOFT THRESHOLDINGQ2

SPECKLE NOISEQ2

Abstract

Speckle noise in RADAR IMAGES reduces the information that can be got from these images. This paper proposed speckle reduction in SAR images by soft thresholding of curvelet coefficients with emphasis on the preserving of edges. First, multiplicative SPECKLE NOISE was transformed into an additive one by taking the logarithm of the original speckled image. Then CURVELET TRANSFORM was taken of logarithmically transformed image and the curvelet coefficients were thresholded by soft thresholding function. The results have been compared then to the results obtained by other widely-used adaptive filters including Frost, Gamma, Kuan, soft thresholding wavelet based filters and hard thresholding of curvelet coefficients. The results showed that the soft thresholding curvelet based filter offers better results than the mentioned filters (Mean Square Error, Normalized Mean Square Error and Mean Absolute Error indices reduced 27%, 27% and 15% respectively, also Equivalent Number of Looks (ENL) increased to 27.34 and 3.61 for RADARSAT1 and ENVISAT respectively). All in all results indicated that soft thresholding of curvelet coefficients besides high reduction of SPECKLE NOISE is also very powerful in keeping the edges.

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APA: Copy

ZAKERI, F., VALADAN ZOEJ, M.J., & SAHEBI, M.R.. (2014). SPECKLE REDUCTION IN SAR IMAGES BASED ON THE SOFT THRESHOLDING OF CURVELET COEFFICIENTS. JOURNAL OF GEOMATICS SCIENCE AND TECHNOLOGY, 4(2), 25-35. SID. https://sid.ir/paper/249271/en

Vancouver: Copy

ZAKERI F., VALADAN ZOEJ M.J., SAHEBI M.R.. SPECKLE REDUCTION IN SAR IMAGES BASED ON THE SOFT THRESHOLDING OF CURVELET COEFFICIENTS. JOURNAL OF GEOMATICS SCIENCE AND TECHNOLOGY[Internet]. 2014;4(2):25-35. Available from: https://sid.ir/paper/249271/en

IEEE: Copy

F. ZAKERI, M.J. VALADAN ZOEJ, and M.R. SAHEBI, “SPECKLE REDUCTION IN SAR IMAGES BASED ON THE SOFT THRESHOLDING OF CURVELET COEFFICIENTS,” JOURNAL OF GEOMATICS SCIENCE AND TECHNOLOGY, vol. 4, no. 2, pp. 25–35, 2014, [Online]. Available: https://sid.ir/paper/249271/en

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