Characterization method of similarity of polarized synthetic aperture radar image

A synthetic aperture radar, image similarity technology, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc., can solve the problem of neglecting the utilization of multi-polarization information

Active Publication Date: 2012-06-13
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0006] In order to solve the existing similarity measurement methods in multi-polarization SAR image registration, only the power information of the echo signal of multi-polarization SAR or the gray level information of a certain channel are used, and the problem of using multi-pola

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  • Characterization method of similarity of polarized synthetic aperture radar image
  • Characterization method of similarity of polarized synthetic aperture radar image
  • Characterization method of similarity of polarized synthetic aperture radar image

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[0045] The present invention mainly adopts the method of processing polarimetric SAR data to verify, and all steps and conclusions are verified correctly on MATLAB7.0. The specific implementation steps are as follows:

[0046] Step 1: Calculate the coherence coefficient γ between the HH channel and the VV channel of all pixels (x, y) in each multi-polarization SAR image among the multiple multi-polarization SAR images to be characterized by similarity 13 , and then obtain the coherence map γ corresponding to each multi-polarization SAR image.

[0047] After a series of preprocessing, two polarimetric SAR images with the same size and different phases are obtained, which are denoted as A and B respectively, and the size is 81×81. Each pixel X in the figure corresponds to a polarization vector X=(HH, HV, VV) T =(s 1 ,s 2 ,s 3 ).

[0048] Select a template with the same size as A and slide it in B. Every time you slide to a position, the image in the template is recorded as...

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Abstract

The invention provides a characterization method of similarity between polarized synthetic aperture radar images, belonging to the radar image processing technology field. The method comprises the following steps: in a plurality of multi-polarization SAR images whose similarity is to be characterized, calculating a coherent coefficient gamma13 between an HH channel and a VV channel of all pixel points (x, y) of each multi-polarization SAR image, and obtaining a coherent graph gamma corresponding to each multi-polarization SAR image; calculating a similarity MI (gamma A, gamma B) based on mutual information between any two images in the plurality of multi-polarization SAR images whose similarity is to be characterized, wherein MI (gamma A, gamma B)=H(gamma A)+ H(gamma B)-H(gamma A, gamma B). According to the invention, a coherent coefficient between copolarization channels is utilized to carry out similarity characterization, and utilization rate of image information is raised; when estimating a coherent coefficient between polarized channels, not only is information of center pixel is utilized, but also polarized information of a surrounding pixel is utilized, and robustness of the coherent coefficient is raised; mutual information measure with good anti-noise performance and acutance characteristic is employed carry a coefficient information source so that the similarity characterization is carried out; thereby a base is established for subsequent accurate efficient multipolarization SAR image rectification.

Description

technical field [0001] The invention belongs to the technical field of radar image processing, and relates to multi-polarization SAR image registration, in particular to a characterization method for multi-polarization SAR image similarity. Background technique [0002] Multipolarization Synthetic Aperture Radar (POL-SAR) is an important field of research and application of microwave imaging technology at present. It effectively improves the ability of radar to obtain ground object information and conducts research on information processing of polarimetric radar remote sensing images. It has important theoretical value and broad application prospects. [0003] Accurate registration of multi-polarization SAR images is an important field of polarimetric SAR research and an important prerequisite for applications such as change detection and target recognition. High-precision image registration can ensure the efficient implementation of next-stage applications. Multi-polarizat...

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Application Information

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IPC IPC(8): G01S13/90
Inventor 黄钰林宣延艳石洁昀杨海光武俊杰李文超杨建宇
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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