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.
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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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