Sar Image Speckle Reduction Method Based on Neighborhood Directional Information

A directional and neighborhood technology, applied in the field of image processing, can solve the problems of insufficient speckle noise filtering, loss of image details and edge information, etc., and achieve the effect of enriching image edge and detail information.

Inactive Publication Date: 2012-02-08
XIDIAN UNIV
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Problems solved by technology

However, this method based on the non-subsampled Contourlet transform domain does not fully consider the geometric characteristics of the image and the statistical and directional characteristics of the SAR image in the non-subsampled Contourlet transform domain. Insufficient noise filtering, while the details and edge information of the image are partially lost

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  • Sar Image Speckle Reduction Method Based on Neighborhood Directional Information
  • Sar Image Speckle Reduction Method Based on Neighborhood Directional Information
  • Sar Image Speckle Reduction Method Based on Neighborhood Directional Information

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Embodiment Construction

[0024] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0025] Step 1, the input SAR image is recorded as y, the SAR image itself is an image polluted by speckle noise, so it is not necessary to add a random noise or noise of a certain characteristic to the original image like studying natural image denoising, and can directly Speckle reduction processing is performed on the image.

[0026] Step 2, decompose the image y through non-subsampling Contourlet to obtain a low-frequency image of the same size as the original image and J scales, each scale has D high-frequency images, and the coefficient of the high-frequency image at position l on scale j denoted as n l，j .

[0027] (2.1) Decompose the input image through a non-subsampling pyramid to obtain a low-frequency image and a high-frequency image with the same size as the original image;

[0028] (2.2) Input the high-frequency image into the non-downsampling direction filte...

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Abstract

The invention discloses a SAR image speckle reduction method based on neighborhood directional information, which mainly solves the shortcomings that the existing SAR image speckle reduction method cannot suppress speckle noise well and loses part of edge and detail information. The process is: do non-subsampling Contourlet decomposition on the original image, and estimate the binary mask for each high-frequency subband coefficient; then use the modified log-Gaussian distribution and the mixed exponential distribution to obtain the conditional similarity The expression of the random ratio; then calculate the prior ratio according to the direction information of the non-subsampled Contourlet transformation obtained by the neighborhood directional model; finally obtain the reduction factor according to the likelihood ratio and the prior ratio to reduce each high-frequency subband coefficient , the coefficients after reduction and change are reconstructed to obtain the output image after speckle reduction. This method has the advantages of effectively removing speckle noise in SAR images and good edge preservation, and can be used to reduce speckle in SAR images with rich edge information and rich details, especially SAR images containing airports, runways, and roads.

Description

technical field [0001] The invention belongs to the technical field of image processing and relates to image noise suppression, in particular to a SAR image speckle reduction method based on a non-subsampled contourlet domain, which can be used for the suppression of speckle noise in synthetic aperture radar images. Background technique [0002] Synthetic Aperture Radar (SAR) is a high-resolution imaging radar. It has all-weather, multi-polarization, multi-view, multi-depression angle data acquisition capabilities and the ability to penetrate some ground objects. It is not only widely used in military affairs, but also has a large number of civil applications in agriculture, meteorology, topography, and disaster monitoring. Applications. However, since SAR emits coherent waves, these coherent waves undergo coherent effects with ground objects, especially the backscattering effect of ground objects, which causes the target echo signal to attenuate. This attenuation is manife...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 王爽焦李成赵红侯彪钟桦刘芳田小林朱虎明刘卓
Owner XIDIAN UNIV
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