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SAR (Specific Absorption Rate) image change detection method based on space approach degree and pixel similarity

A technology of image change detection and closeness, which is applied in the field of image processing, can solve the problems of high detection error rate and low detection accuracy, and achieve the effects of high detection accuracy, information reduction, and suppression of speckle noise

Inactive Publication Date: 2013-04-03
XIDIAN UNIV
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Problems solved by technology

[0010] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art, and propose a SAR image change detection method based on spatial closeness and pixel similarity, so as to overcome the problem of high detection error rate and low detection accuracy of the existing method

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  • SAR (Specific Absorption Rate) image change detection method based on space approach degree and pixel similarity
  • SAR (Specific Absorption Rate) image change detection method based on space approach degree and pixel similarity
  • SAR (Specific Absorption Rate) image change detection method based on space approach degree and pixel similarity

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Embodiment Construction

[0035] refer to figure 1 , the present invention comprises the following steps:

[0036] Step 1: Perform geometric correction and registration on the two SAR images A and B in the same area at different times. The most commonly used correction and registration methods are the control point method and the nearest neighbor method of grayscale interpolation. See Hu Donghong's "Two A Comparison of Image Correction Algorithms in Practical Applications" 2009, Computer Engineering and Applications.

[0037] In practice, there are geometrically corrected and registered images, and the present invention only performs simulation experiments on the geometrically corrected and registered images.

[0038] Step 2: Construct a difference image map DI for the two corrected and registered SAR images A and B:

[0039] 2a) Take the pixel gray value neighborhood set y′ of SAR image A at position (i, j) 1 (i, j) and the pixel gray value neighborhood set y′ of SAR image B at position (i, j) 2 (...

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Abstract

The invention discloses an SAR (Specific Absorption Rate) image change detection method based on space approach degree and pixel similarity, belonging to the field of SAR image change detection. The realizing process comprises the following steps of: at first, carrying out geometry correction and registration on two SAR images at different time in a same area; secondly, structuring a difference image by using bilateral similarity; and finally, carrying out threshold value treatment on the difference image by using a threshold method to obtain a change detection result image. According to the SAR image change detection method provided by the invention, the problem that structure of the difference image in SAR image change detection is seriously influenced by speckle noise of an SAR image is solved through a method for structuring the difference image of the space approach degree and the pixel similarity, so that the precision of the change detection is improved. The SAR image change detection method provided by the invention can be used for fields, such as environmental monitoring, farming research, city area study, forest monitoring, and the like.

Description

technical field [0001] The invention belongs to the technical field of image processing, relates to SAR image change detection, can be used to solve the problem of low detection accuracy in the field of SAR image change detection, and is suitable for improving the accuracy of SAR image change detection for various complex 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 targets and scenes through SAR image change detection technology. [0003] SAR image change detection is one of the main appl...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00
Inventor 公茂果焦李成付磊马晶晶马文萍尚荣华李阳阳王爽
Owner XIDIAN UNIV
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