Automatic extracting method of urban built-up area border
A technology of automatic extraction and built-up area, applied in image analysis, instrumentation, calculation, etc., can solve the problems of inability to process high-resolution full-color images and large amount of calculation.
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[0125] Taking the resource No. 3 panchromatic remote sensing image of Wuhan in 2007 as an example, the method of the present invention is used to study the boundary extraction of urban built-up areas. Wuhan is a typical city with multiple centers. The Yangtze River and numerous lakes that run through divide Wuhan into three towns: Wuchang, Hankou and Hanyang. The specific implementation process of the example is as follows:
[0126] 1) The image is stretched for the mean value of histogram.
[0127] 2) First, the Roberts operator is used to extract the edge feature image of the urban built-up area, and the Otsu automatic threshold segmentation method is used to binarize it, and the optimal threshold K is calculated as 11. Then divide the binarized image into a number of sub-region images of 128*128 size, calculate the density ρ of each sub-region image, set the density threshold T to 0.1, and perform block density according to equations (1) and (2) Filter to obtain a reasonable e...
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