SAR image speckle reduction method and system based on anisotropic diffusion equation
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A technology of diffusion equation and anisotropy, which is applied in the field of SAR image speckle reduction method and system based on anisotropic diffusion equation, can solve the problem of non-providance, and achieve the effect of maintaining positive definiteness and ensuring cross-talk.
Inactive Publication Date: 2018-11-23
GUANGDONG UNIV OF TECH
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[0003] In the prior art, the anisotropic coherent speckle filtering (Speckle reducing anisotropic diffusion, SRAD) method is a method that is only suitable for coherent speckle filtering of single-polarization synthetic aperture radar images. Anisotropic diffusion equation, the coherent speckle noise reduction performance achieved by this method
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Embodiment 1
[0065] Please refer to the attached figure 1 , which is a schematic flowchart of a method for reducing speckle in a SAR image based on an anisotropic diffusion equation provided in Embodiment 1 of the present invention. The method specifically includes the following steps:
[0066] S11, read the second-order moment data of the SAR image, the second-order moment data includes T 11 , T 22 , T 33 、Re(T 12 ), Im(T 12 ), Re(T 13 ), Im(T 13 ), Re(T 23 ) and Im(T 23 ).
[0067] It should be noted that when performing coherent speckle noise reduction on full-polarization SAR (Synthetic Aperture Radar) images in the technical solutions provided by the embodiments of the present invention, resolution unit data (second-order moments) must be used as the implementation object. If the scattering matrix of the resolution unit is used as the implementation object, the polarization properties of all resolution units will be destroyed. The technical solutions provided by the embodime...
Embodiment 2
[0100] Please refer to the attached image 3 , is a schematic structural diagram of a SAR image speckle reduction system based on anisotropic diffusion equation provided in Embodiment 2 of the present invention, and the system is suitable for implementing the method for SAR image speckle reduction based on anisotropic diffusion equation provided in the embodiment of the present invention . The system specifically includes the following modules:
[0101] Data reading module 31, is used for reading the second-order moment data of SAR image, and described second-order moment data comprises T 11 , T 22 , T 33、Re(T 12 ), Im(T 12 ), Re(T 13 ), Im(T 13 ), Re(T 23 ) and Im(T 23 );
[0102] The first calculation module 32 is used for T in the second-order moment data 11 , T 22 , T 33 Perform comprehensive calculations to obtain total power images and local statistical data;
[0103] The first covering module 33 is used for correspondingly covering the calculated total pow...
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Abstract
The embodiment of the invention discloses a SAR image speckle reduction method and a system based on an anisotropic diffusion equation, the method comprising: reading second-order moment data of the SAR image; performing comprehensive calculation on the second-order moment data to obtain a total power image and local statistical data; correspondingly covering previous data with the total power image and the local statistical data; performing Gaussian smoothing processing on the total power image, and calculating partial derivatives in the x and y directions; correspondingly covering previous data with the partial derivatives in the x and y directions; calculating structure tensor function based on the partial derivatives in the x and y directions; calculating the total power image to obtain a diffusivity function value; calculating diffusion tensor function; performing a diffusion on the second-order moment data, separately; updating the number of diffusion to complete speckle reduction. The technical solution provided by the SAR image speckle reduction method and system based on an anisotropic diffusion equation, is suitable for full-polarization and single-polarization SAR images. There is no crosstalk between polarization channels, when performing speckle reduction on a full-polarization SAR image, and can keep the positive and negative of each second-order moment data in the image.
Description
technical field [0001] Embodiments of the present invention relate to the technical field of image processing, and in particular to a method and system for reducing speckle in a SAR image based on an anisotropic diffusion equation. Background technique [0002] When synthetic aperture radar (including single-polarization or full-polarization synthetic aperture radar) observes ground targets, the transmitting antenna emits electromagnetic waves. There are multiple scattering target points in a single resolution unit on the ground, and the echoes collected by the synthetic aperture radar receiving antenna is the vector sum of the sub-echoes of each scattering point inside the resolution unit. Since the total echo strength of the resolution unit is related to the viewing angles of the transmitting and receiving antennas of the SAR, the change of the viewing angle will cause the phase relationship between the sub-echoes to change, resulting in a corresponding change in the ampli...
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