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SAR (Synthetic Aperture Radar) image change detection method based on neighborhood similarity and mask enhancement

An image change detection and similarity technology, which is applied in the field of remote sensing image processing, can solve the problems that the difference between the change class and the non-change class is not obvious enough, increase the complexity of the change detection method, increase the difficulty of classification, etc., and achieve the reduction of complexity and error detection. And the effect of low number of missed detection and small time complexity

Inactive Publication Date: 2012-06-20
XIDIAN UNIV
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Problems solved by technology

However, these methods are greatly affected by the speckle noise of the SAR image, and the two-temporal SAR image must be filtered and denoised in advance to obtain better change detection results, and the filter takes a long time to run in the change detection method. Increased the complexity of the change detection method. In addition, the difference between the changed class and the non-changed class in the difference graph constructed by these methods is not obvious enough, which increases the difficulty of subsequent classification.

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  • SAR (Synthetic Aperture Radar) image change detection method based on neighborhood similarity and mask enhancement
  • SAR (Synthetic Aperture Radar) image change detection method based on neighborhood similarity and mask enhancement
  • SAR (Synthetic Aperture Radar) image change detection method based on neighborhood similarity and mask enhancement

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[0044] Refer to attached figure 1 , the present invention comprises the following steps:

[0045] Step 1: Use the remote sensing image processing software ERDAS to analyze two SAR images of the same scene I 1 and I 2 Perform geometric correction and registration.

[0046] Step 2: According to the neighborhood similarity NSR operator, construct the image I according to the following steps 1 and I 2 The difference image map DI.

[0047] 2a) Obtain the two-temporal SAR image I respectively 1 and I 2 Neighborhood set N of pixel gray values ​​at the same position x 1 (x) and N 2 (x), whose size is N×N, N ∈ {3, 5, 7, 9};

[0048] 2b) Compare two neighborhood sets N 1 (x) and N 2 (x) similarity, get the pixel gray value DI(x) of the difference map DI at position x:

[0049] DI ( x ) = Σ i = 1 ...

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Abstract

The invention discloses an SAR (Synthetic Aperture Radar) image change detection method based on neighborhood similarity and mask enhancement, relating to the field of remote sensing image processing. The method mainly solves the problem that a difference map construction of SAR image change detection is seriously influenced by SAR image speckle noise and comprises the following steps of: (1) geometrically correcting and registering two SAR images I1 and I2 in the same scene at different times; (2) constructing a difference image map DI of the images I1 and I2 by using a neighborhood similarity operator; (3) performing mask enhancement on the difference image map DI to obtain a new difference image map NDI; and (4) clustering the new difference image map NDI to obtain a change detection result map CDI by using a K mean value clustering method determined by an initial point. The method has the characteristics of high operation efficiency, low algorithm complexity, low time complexity and good experimental effect, and can be used for the change detection of two time-phase SAR images.

Description

technical field [0001] The invention belongs to the field of remote sensing image processing, relates to change detection of remote sensing images, and can be used for detecting changes of SAR images. Background technique [0002] Synthetic Aperture Radar (SAR) is a breakthrough technology in the field of modern remote sensing and has become an important means of obtaining information. With the continuous development and maturity of SAR technology and the continuous improvement of the resolution of the SAR system, the SAR system has the advantages of all-weather, all-time and large coverage. The acquisition of SAR images of the same scene at different times makes it possible to provide real-time dynamic information of the target and the scene through the SAR image change detection technology. [0003] Change detection is one of the main applications of remote sensing technology. It compares and analyzes various images of the same scene at different times, and obtains the ch...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G06T7/00G06T5/00
Inventor 公茂果焦李成吴巧娣王桂婷钟桦王爽刘芳马文萍
Owner XIDIAN UNIV
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