Hyperspectral image water area automatic extraction method
An automatic extraction and hyperspectral image technology, applied in the field of remote sensing image processing, can solve problems such as low efficiency, time-consuming and labor-consuming, and dependence, and achieve high-precision results
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[0039]The present invention will be further described in detail below with reference to the drawings and specific embodiments.
[0040]Such asfigure 1 As shown, a method for automatically extracting waters from hyperspectral images includes the following steps:
[0041]Step 1. Read the hyperspectral image, analyze its band information, and calculate the water index value of each pixel in the image;
[0042]The water index value can be calculated using conventional methods in the prior art, such as the following formula:
[0043]
[0044]Where Iwater Is the water index value, refGREEN , RefBLUE , RefNIRThey are the reflectivity of the green wave band, the blue wave band and the near-infrared wave band respectively, and k is a coefficient set artificially, usually 0~2.
[0045]Step 2: Calculate the water area segmentation threshold based on the OTSU Otsu method to obtain the first extraction result of the water area; the specific method is:
[0046]Step 2a: Arrange the pixels of the image in order of brig...
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