SAR image change detection method based on directional wavelet transformation and improved level set

An image change detection and level set technology, applied in the field of image processing, can solve problems such as high time complexity, sensitivity to initialization position, and impact on segmentation accuracy

Inactive Publication Date: 2014-12-24
XIDIAN UNIV
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Problems solved by technology

The difference map is segmented by the improved C-V level set, which has high segmentation accuracy; but the improved C-V level set model is sensitive to the initializati

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  • SAR image change detection method based on directional wavelet transformation and improved level set
  • SAR image change detection method based on directional wavelet transformation and improved level set
  • SAR image change detection method based on directional wavelet transformation and improved level set

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Embodiment Construction

[0062] Such as figure 1 As shown, a kind of SAR image change detection method based on directional wave transform and improved level set provided by the present invention comprises the following steps:

[0063] 1) Input the SAR image A before the change and the SAR image B after the change in the same area for image registration, geometric correction and image denoising preprocessing, and obtain two preprocessed images X 1 , X 2 ;

[0064] 2) For the preprocessed two images X 1 and x 2 , constructing the log ratio difference map I by the log ratio method L , constructing the mean ratio difference map I by the mean ratio method M :

[0065] I L = | log X 2 + 1 X 1 + 1 | = | log...

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Abstract

The invention provides an SAR image change detection method based on directional wavelet transformation and an improved level set. The SAR image change detection method comprises the achieving steps of 1 inputting SAR images A and B to be preprocessed; 2 adopting different ratio methods to establish ratio difference charts by using preprocessed images; 3 fusing the ratio difference charts based on the directional wavelet transformation; 4 segmenting the fused ratio difference chart; 5 obtaining a change detection result chart. Directional wavelet fusion is performed on a logarithm ratio difference chart and an average ratio difference chart, so that background information is effectively inhibited, change information is strengthened, and accordingly a change area and an unchanged area are accurately described. In addition, due to the fact that an improved SBGFRLS level set model is adopted to perform image segmentation on fused difference images in the method, the accuracy of classification on the change information and non-change information is improved, a change detection result can be accurate, and meanwhile the complexity of change detection time is remarkably reduced.

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 based on directional wave transformation and improved level set. Background technique [0002] With the rapid development of Synthetic Aperture Radar (SAR) technology, change detection in SAR images has become one of the important applications of SAR image processing and interpretation. The change detection of remote sensing images refers to the comparison and analysis of two or more remote sensing images obtained at different times in the same area, and according to the differences between the images, the information on the changes of the ground objects that people need over time is obtained. Compared with visible light and infrared remote sensing, SAR has the characteristics of all-day, all-weather, high resolution, and strong penetrating ability, so it has been widely used in military and civilian applications. SAR imag...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T5/00
Inventor 白静焦李成张钊熊涛马晶晶马文萍侯彪杨淑媛
Owner XIDIAN UNIV
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