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
CN104240249AInactive Publication Date: 2014-12-24XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
XIDIAN UNIV
Publication Date
2014-12-24
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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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