Coherent Speckle Suppression Method for Polarization SAR Image Based on Relative Polarization Total Variation

A technology of coherent speckle suppression and total variation, applied in image enhancement, image analysis, image data processing and other directions, can solve problems such as large amount of computation, blurring of image edges and detail information, etc.

Active Publication Date: 2022-04-08
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, this type of method generally blurs the edge and details of the image when denoising, and requires a large amount of computation.

Method used

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  • Coherent Speckle Suppression Method for Polarization SAR Image Based on Relative Polarization Total Variation
  • Coherent Speckle Suppression Method for Polarization SAR Image Based on Relative Polarization Total Variation
  • Coherent Speckle Suppression Method for Polarization SAR Image Based on Relative Polarization Total Variation

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Embodiment Construction

[0047] This embodiment provides a method for suppressing coherent speckle in polarimetric SAR images based on relative polarization total variation, the process of which is as follows figure 1 As shown, the specific implementation process is as follows:

[0048] (1) Separating the main diagonal elements and off-diagonal elements of the polarization coherence matrix T of the polarization SAR data.

[0049] 1a) Use the polarimetric SAR processing software PolSARpro_v5.1.2 to read the polarimetric coherence matrix of the polarimetric SAR data from the polarimetric SAR data;

[0050] 1b) Express the polarization coherence matrix T as:

[0051]

[0052] Among them, S HH Indicates the echo data of H direction transmission and H direction reception, S HV Indicates the echo data transmitted in the H direction and received in the V direction, S VV Indicates the echo data transmitted and received in the V direction, * indicates the complex conjugate transpose, and 2|S HV | 2 ...

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Abstract

The present invention relates to a polarization SAR image coherence speckle suppression method based on relative polarization total variation. By separating the polarization coherence matrix of the polarization SAR image into main diagonal elements and non-diagonal elements, the application window roll Product local total variation and global total variation update the main diagonal elements, reconstruct the polarization coherence matrix from the original off-diagonal elements and the updated main diagonal elements, and use the polarization coherence on adjacent pixels The matrix ratio and the distance of the polarization coherent matrix before and after updating are used to obtain the pixel position that must retain the polarization feature. The present invention only performs coherent speckle suppression on the main diagonal elements of the polarization coherence matrix that do not belong to the above-mentioned pixel positions, and solves the problem that the existing polarization SAR coherent speckle suppression cannot well combine the structural information and The problem of speckle suppression by combining the two scattering properties makes the speckle suppression of polarimetric SAR both in terms of structure information and scattering properties.

Description

technical field [0001] The invention relates to a polarization SAR image coherent spot suppression method based on relative polarization total variation, and belongs to the technical field of total polarization SAR (Synthetic Aperture Radar, synthetic aperture radar). Background technique [0002] PolariSAR is an imaging radar used to measure the polarization characteristics of radiation signals, which can obtain target scattering characteristics in different polarization states. Therefore, polarimetric SAR is widely used in fields such as agricultural survey, forestry research and geological exploration. However, due to the large amount of granular coherent speckle noise in polarimetric SAR, the interpretation of the image is not obvious, and even seriously affects the application of the image. Therefore, speckle suppression for polarimetric SAR images is of great significance. [0003] At present, the speckle suppression methods of polarimetric SAR images are mainly divi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G01S13/90G01S7/02
CPCG06T5/001G01S7/024G01S13/90G06T2207/10032G01S13/9076
Inventor 江畅李文梅陈一祥
Owner NANJING UNIV OF POSTS & TELECOMM
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