Method for detecting lakeshore and extracting lake profile from SAR image

A technology of lakes and contours, applied in the reflection/re-radiation of radio waves, measurement devices, radio wave measurement systems, etc., can solve problems such as difficulty in extracting edges and difficult images, and achieve a high degree of automation, high efficiency, and high speed. Effect

Inactive Publication Date: 2008-02-20
BEIJING JIAOTONG UNIV
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Problems solved by technology

Due to the existence of a large amount of speckle noise, it is difficult to accurately extract edges in radar images
As far as SAR image lake shoreline detection is concerned, in addition to the influence of speckle noise, traditional edge point tracking and connection algorithms are difficult to apply to images with large noise interference, especially the more complex edges, and lake shorelines are generally more tortuous. Many, using the traditional method can not better connect the edges to form the outline of the lake

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  • Method for detecting lakeshore and extracting lake profile from SAR image
  • Method for detecting lakeshore and extracting lake profile from SAR image
  • Method for detecting lakeshore and extracting lake profile from SAR image

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Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. As shown in Figure 1, technical scheme of the present invention is:

[0023] (1) First of all, in order to search for areas with texture or edge traces in any direction (shown as the relative standard deviation of the neighborhood is relatively large), so as to protect them during subsequent processing, the obtained SAR images are automatically scanned in all directions. Adaptive dynamic window filtering to suppress speckle noise. In the filtering process, a moving window with an initial size of N×N is used to process each pixel of the image. The specific operation process is shown in Figure 2. The working process is as follows:

[0024] ①Calculate the sub-window w in all directions in the initial large window l Average value of pixels in and the relative standard deviation c relative to the gray value of the central pixel l ;

[...

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Abstract

The utility model discloses a method to detect the lake shore line and extract the lake contour from the synthetic aperture radar remote sensing image. The utility model adopts the technical proposal that: firstly, an all-direction self-adaptive dynamic window filter is utilized to do speckle noise suppression on the synthetic aperture radar remote sensing image; secondly, the fact that the singularity of the edge and the noise have different propagation laws according to scale variation in dyadic wavelets transformation is utilized to detect edge points; thirdly, the traditional contour following method is utilized to connect the edge points; finally, an active contour model based on gradient vector flow is utilized to fit the lake contour. The utility model effectively eliminates the influence of speckle noise in SAR image on flood boundary extraction, detects the lake shore line accurately and finally gets the lake contour.

Description

technical field [0001] The invention relates to a method for detecting a lake shoreline and extracting a lake outline from a SAR image, and belongs to the technical field of synthetic aperture radar (SAR) remote sensing image processing and application. Background technique [0002] In the research of map drawing, flood disaster monitoring, lakeshore change and lake evolution, the detection of lake shoreline and the acquisition of lake contour shape are an essential step. Synthetic Aperture Radar (SAR) remote sensing image detection of the surface environment has the unique advantages of all-day and all-weather, and is very sensitive to land and water boundaries. It has been widely used in many fields of earth observation. Using synthetic aperture radar (SAR) remote sensing images to detect lake shoreline is a better method. Because the reflection of the water body to the radar wave is almost zero, it appears as an area with a small gray value on the image, while the reflec...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G06K9/46
Inventor 谭衢霖魏庆朝杨松林
Owner BEIJING JIAOTONG UNIV
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