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SAR image change detection method based on oriented difference chart

An image change detection and change detection technology, applied in the field of image processing, can solve the problems of ineffective noise suppression, high time complexity, initialization position sensitivity, etc., to achieve accurate results, improve accuracy, and avoid interference.

Inactive Publication Date: 2015-07-15
XIDIAN UNIV
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Problems solved by technology

The improved C-V level set is used to segment the difference map, which has high segmentation accuracy and can effectively extract change information; however, the improved C-V level set model is sensitive to the initialization position and cannot effectively suppress noise interference. The difference has a great influence on the segmentation accuracy, and has a high time complexity

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  • SAR image change detection method based on oriented difference chart
  • SAR image change detection method based on oriented difference chart
  • SAR image change detection method based on oriented difference chart

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] Refer to attached figure 1 , the concrete steps of the present invention are as follows:

[0033] Step 1: For the input image X 1 , X 2 preprocessing.

[0034] Enter the same area t 1 SAR image of time X 1 and t 2 SAR image of time X 2 , and sequentially perform image registration, geometric correction and image denoising preprocessing to obtain two preprocessed SAR images I 1 , I 2 .

[0035] Step 2: Obtain the mean ratio difference map I from the preprocessed image M .

[0036] For the two preprocessed SAR images I 1 , I 2 , constructing the mean ratio difference map I by the mean ratio method M , I M Each element in I M (i, j) is calculated according to the following formula:

[0037] L M ( i , j ) = 1 -...

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Abstract

The invention discloses an SAR image change detection method based on an oriented difference chart. The problems that in the prior art, change information of SAR images of one area at different moments can not be accurately described, and the interference resisting capacity is weak are mainly solved. The SAR image change detection method includes the steps of 1, preprocessing two SAR images of one area at different moments; 2, respectively building a mean-value ratio difference chart and a logarithm ratio difference chart for the two preprocessed SAR images; 3, according to the thought of an oriented filter, enabling the mean-value ratio difference chart to serve as an oriented chart, enabling the logarithm ratio difference chart to serve as an input chart, and carrying out fusing to generate the oriented difference chart; 4, dividing the oriented difference chart through a mean-value cluster level set model based on local joint entropy, and obtaining the result of change direction. By means of the SAR image change detection method, interference of background area information can be effectively restrained, the change direction accuracy is improved, and the SAR image change detection method can be used for natural disaster evaluation, environment resource monitoring and urban construction planning.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a SAR image change detection method, which can be used for natural disaster assessment, environmental resource monitoring and urban construction planning. Background technique [0002] Compared with visible light and infrared remote sensing, synthetic aperture radar (SAR) has the characteristics of all-day, all-weather, and strong penetrating ability, so it has been widely used in both military and civilian fields. With the rapid development of SAR technology, SAR image change detection technology becomes increasingly important. SAR image change detection refers to the comparison and analysis of two or more SAR images obtained at different times in the same area, and the change information of the studied area over time is obtained according to the change differences between these SAR images. The key steps of SAR image change detection are to generate corresp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 白静焦李成李甜甜张钊王爽刘红英马文萍张向荣
Owner XIDIAN UNIV
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