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SAR image speckle noise suppression method based on Gamma-Lee filtering

A speckle noise and image technology, which is applied in the field of SAR image speckle noise suppression based on Gamma-Lee filter, can solve the problems of poor edge protection effect and unsatisfactory coherent speckle noise suppression effect, etc.

Active Publication Date: 2020-10-30
ZHEJIANG UNIV OF TECH
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[0008] Aiming at the suppression of SAR image speckle noise, the present invention proposes a SAR image speckle noise suppression method based on Gamma-Lee filtering. The classic Lee filter denoising algorithm is constructed on the fully developed multiplicative model of coherent speckle noise points. For The immature coherent speckle noise suppression effect is not ideal, and the edge protection effect is not good

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[0032] The present invention will be further described below.

[0033] A kind of SAR image speckle noise suppressing method based on Gamma-Lee filter, comprises the following steps:

[0034] Step 1, read original SAR image data matrix: original image matrix R, matrix size is M * N, and its M and N are integers, respectively represent the quantity of image row and column;

[0035] Step 2, perform Gamma correction on the original image R: set the Gamma coefficient to c, the Gamma index to e, and the Gamma correction method of the original image is as follows:

[0036] S=c×R e (2)

[0037] Among them, S is the output image of the Gamma correction transformation with a size of M×N. Through this nonlinear transformation, the SAR image can be changed from the linear response of the exposure intensity to the response of the human eye: when the Gamma index e is greater than 1 When , this correction will extend the high gray value of the gray distribution histogram of the image; an...

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Abstract

The invention discloses an SAR image speckle noise suppression method based on Gamma-Lee filtering. The method comprises the steps: carrying out the Gamma transformation of an original image so as toimprove the details of a dark part of the original image, and solving a problem that the retaining effect of an edge detail part of a filtered SAR image is not good; traversing each pixel point of themeasured image by adopting a translation-invariant local window, and realizing Lee filtering in a manner of counting the mean value and variance of the covered pixel points and a central pixel value;in combination with the thought of adjusting the Gamma coefficient and the Gamma index through negative feedback, inhibition of SAR image speckle noise is adjusted and enhanced step by step; finally,simulation experiment results show that the SAR image filtering method solves the problem that an existing SAR image filtering method is poor in image edge detail part retaining effect, and meanwhilethe speckle noise restraining effect is improved to a certain extent. The method is superior to an original Lee filtering method in noise suppression and edge detail protection effects, and can be applied to the field of SAR image processing.

Description

technical field [0001] The invention relates to the technical field of SAR image processing, in particular to a Gamma-Lee filter-based SAR image speckle noise suppression method. [0002] technical background [0003] Synthetic Aperture Radar (SAR) is an advanced microwave remote sensing radar, which has good multi-polarization measurement and interference measurement capabilities, and also has the advantages of all-day, all-weather, and penetrability. It is widely used in remote sensing applications. It has better measurement accuracy than optical remote sensing. At the same time, synthetic aperture radar can be implemented on a variety of platforms, and UAV-borne, airborne and space-borne SAR radars can meet the requirements of many monitoring scenarios. This advantage makes SAR radars more popular in the field of national defense and military affairs. The final product of SAR—the application of SAR images is more diverse, for example: in the field of military reconnaissan...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/20G06T5/40G06T7/90
CPCG06T5/20G06T5/40G06T7/90G06T5/70
Inventor 黄国兴刘艺鹏卢为党彭宏
Owner ZHEJIANG UNIV OF TECH
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