SAR (Synthetic Aperture Radar) image spot-inhibiting method based on spare domain noise distribution constraint

A noise distribution and image technology, applied in the field of image processing, can solve the problem of loss of radiation characteristics, etc., and achieve the effect of strong anti-spotting ability and good retention of radiation characteristics

Inactive Publication Date: 2014-08-06
XIDIAN UNIV
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Problems solved by technology

This method can better maintain the texture and details of the image while suppressing the coherence speckle, but it has a very obvious loss of radiation characteristics.

Method used

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  • SAR (Synthetic Aperture Radar) image spot-inhibiting method based on spare domain noise distribution constraint
  • SAR (Synthetic Aperture Radar) image spot-inhibiting method based on spare domain noise distribution constraint
  • SAR (Synthetic Aperture Radar) image spot-inhibiting method based on spare domain noise distribution constraint

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0034] Step 1, perform logarithmic transformation on the original SAR image and divide it into overlapping sub-image blocks.

[0035] The original SAR image is logarithmically transformed to obtain the transformed image m; then the transformed image m is divided into L overlapping sub-image blocks of the same size M={m 1 ,m 2 ,...,m i ,...,m L}, m i Represents i sub-image blocks, i=1, 2,...,L, the size of each sub-image block is 5×5, and the total number of pixels of the sub-image blocks is T=25.

[0036] Step 2, perform K-means clustering on the sub-image block M.

[0037] (2a) First perform high-pass filtering on the sub-image block M, and obtain the filtered sub-image block as in is the i-th subgraph m i Filtered sub-image blocks, i=1,2,...,L...

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Abstract

The invention discloses an SAR (Synthetic Aperture Radar) image spot-inhibiting method based on spare domain noise distribution constraint, which mainly solves the problem that existing spot-inhibiting method cannot keep image texture details and radiation characteristic at the same time. The method comprises the following steps: 1, carrying out logarithm transformation on an original SAR image, dividing the transformed image into overlapped sub image blocks which are same in size and clustering the image blocks by a K mean value clustering method; 2, solving a sparse representation sub dictionary of each cluster by a principal component analysis method and calculating an estimated value of a sparse representation coefficient of a noise-free sub image corresponding to each sub image block by non-local mean value algorithm; 3, solving the final noise-free sparse representation coefficient by soft threshold shrinking algorithm and obtaining the de-noised sub image blocks through reverse sparse transformation; and 4, splicing the sub image blocks and carrying out reverse logarithm transformation to obtain the spot-inhibited SAR image. The method disclosed by the invention is strong in coherent spot inhibiting ability, and the image texture details and radiation characteristic are kept well, so that the method can be used for target identification and characteristic extraction.

Description

technical field [0001] The invention belongs to the technical field of image processing, in particular to a speckle suppression method for a synthetic aperture radar SAR image, which can be used for target recognition and feature extraction. Background technique [0002] Synthetic Aperture Radar (SAR) is an active microwave remote sensing device with all-day and all-weather imaging capabilities, and has been widely used in military and civilian applications. However, the coherent imaging mechanism of SAR results in strong coherent speckle noise in the imaging results, which makes target recognition and feature extraction quite difficult. Therefore, it is necessary to carry out the work of coherent speckle suppression in SAR images. [0003] SAR image speckle suppression mainly has two goals, one is to effectively suppress the coherent speckle noise in the homogeneous area of ​​the image, and the other is to preserve the edge, texture, point target and other details of the sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 王成龙赵光辉周丹凤石光明沈方芳
Owner XIDIAN UNIV
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