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SAR image change detection method and device

An image change detection and image technology, which is applied in the field of image processing, can solve problems such as change detection without obvious targets and insignificant effects

Active Publication Date: 2017-12-08
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0005] However, this method is mainly used to detect SAR images with obvious targets, and cannot solve the change detection without obvious targets, and the effect of suppressing the influence of speckle noise is not significant

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  • SAR image change detection method and device
  • SAR image change detection method and device

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Embodiment Construction

[0046]The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0047] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0048] Next, a method for detecting changes in a SAR image provided by an embodiment of the present invention is described in detail. figure 1 A flow chart of a method for SAR image change detection p...

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Abstract

The embodiment of the invention discloses an SAR image change detection method and device. Two SAR images are divided into a reference image and a test image. The two images are overlapped and divided to acquire reference image blocks and test image blocks. Each image block is corresponding to a sparse value. By constructing a local dictionary and using an orthogonal matching pursuit method, the sparse estimation value of each test image block is solved. According to the sparse estimation value of each test image block and the sparse value of each reference image block, a ratio image is constructed. Median filtering is carried out on the ratio image to acquire a median ratio image, namely the change detection result image of the SAR images. The SAR images are overlapped and divided, which improves the detection accuracy of SAR image change detection. The characteristics of the median ratio image are used. The influence of noise on the detection accuracy can be greatly reduced. The detection accuracy of SAR image change detection is further improved.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a method and device for SAR image change detection. Background technique [0002] The rapid development of modern remote sensing technology provides a convenient way for change detection, and remote sensing data has become the main data source of change detection. SAR image change detection technology is an important part of remote sensing image research. It compares and analyzes multiple remote sensing images taken at different times in the same region by means of image processing and pattern recognition, and obtains people's information based on the differences between images. Information about changes in the required features or objects over time. Change detection technology can detect the changes between the image gray value or local texture in different periods, and on this basis, the changes in shape, position, quantity and other attributes of the target o...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/30G06K9/62
CPCG06T7/0002G06T7/30G06T2207/20032G06T2207/10032G06F18/28
Inventor 蔡述庭张曼刘坤陈平李卫军
Owner GUANGDONG UNIV OF TECH
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