Method for performing satellite-borne SAR (Synthetic Aperture Radar) image ortho-rectification based on DSM (Digital Surface Model) of median filtering

An orthophoto correction and median technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as blurring of details, and achieve the effect of less blur, better image details, and protection of image details.

Inactive Publication Date: 2015-06-03
LIAONING TECHNICAL UNIVERSITY
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Problems solved by technology

However, it not only smoothes the noise but also blurs the details in the image

Method used

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[0025] An application method of DSM based on median filtering in spaceborne SAR image orthorectification. The pixel is the area of ​​the center point, and then the gray value of each pixel in the area is sorted, and the middle value is taken as the new value of the gray value of the center point pixel. The area is called a window. When the window is up, down, left, and right in the image After moving, use the median filtering algorithm to smooth the image, characterized in that,

[0026] For one-dimensional sequence x 1 ,x 2 ,x 3 ,... ,x n , arrange n data according to size: x i1 ≤x i2 ≤x i3 …≤x in , then the median y of the sequence is: when n is an odd number, y=med{x 1 ,x 2 ,x 3 ,... ,x n}=x i((n+1) / 2) ; When n is an even number, y=med{x 1 ,x 2 ,x 3 ,... ,x n}=0.5(x i(n / 2) +x i((n+1) / 2) ) (1)

[0027] A filter window with a specific length L=2n+1 is taken, and n is a positive integer. Slide the window on the data, and the median filter out...

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Abstract

The invention relates to an application method for performing satellite-borne SAR (Synthetic Aperture Radar) image ortho-rectification based on a DSM (Digital Surface Model) of median filtering, wherein the median filtering is a type of nonlinear smoothing filtering, depends on a fast sorting algorithm, and is a domain operation. The application method comprises the following steps of firstly determining a domain which takes a certain pixel as a center point, sorting the gray value of each pixel in the domain, and taking the median value as a new gray value of the center point pixel, wherein the domain is called as a window; after the window is moved up and down as well as left and right, a smoothing processing is performed on an image by utilization of a median filtering algorithm. By employment of the median filtering method, the smoothing filtering processing is performed on the DSM of an optical satellite image, and the distortion phenomenon is eliminated.

Description

technical field [0001] The method relates to an application method of DSM based on median filtering in space-borne SAR image orthorectification. The median filtering method is used to smooth and filter the DSM of the optical satellite image to eliminate distortion and distortion. Background technique [0002] Since the spaceborne SAR is a side-view imaging, the elevation fluctuation has a great influence on the positioning accuracy. In the process of orthorectification of spaceborne SAR images, high-precision DEM or DSM is needed. At present, the world's high-precision DEM is the 90m grid SRTM data released by the United States, but it is far from meeting the DEM accuracy required for orthorectification of spaceborne SAR images. Therefore, the high-precision DEM of the corresponding area is one of the keys to the orthorectification of spaceborne SAR images. [0003] Ziyuan No. 3 satellite is my country's first high-precision civil optical satellite. The nominal accuracy of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 赵瑞山杨帆吴作启徐佳
Owner LIAONING TECHNICAL UNIVERSITY
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