A method for water extraction from high-resolution remote sensing images based on multi-feature joint processing

A remote sensing image, high-resolution technology, applied in image data processing, image analysis, image enhancement, etc., can solve problems such as water edge extraction errors, loss of small water bodies, and edge pixel confusion.

Active Publication Date: 2019-03-19
WUHAN UNIV
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Problems solved by technology

However, texture information often needs to be windowed during the calculation process. This process will cause confusion of edge pixels, resulting in errors in water edge extraction and loss of small water bodies.

Method used

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  • A method for water extraction from high-resolution remote sensing images based on multi-feature joint processing
  • A method for water extraction from high-resolution remote sensing images based on multi-feature joint processing
  • A method for water extraction from high-resolution remote sensing images based on multi-feature joint processing

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Embodiment

[0060] The technical solution provided by the present invention is a water body extraction method of high-resolution remote sensing images based on multi-feature joint processing, which utilizes the advantages of the pixel length feature in water body extraction, and combines it with the water body index and the area feature of the water body object, Improved the accuracy and stability of water extraction. Such as figure 1 shown, including the following steps:

[0061] Step 1, radiometric calibration of remote sensing images, the method is as follows:

[0062] First, according to the formula (1), the channel observation technical value DN of each satellite payload is converted into the equivalent apparent radiance at the entrance pupil of the satellite payload:

[0063] L=Gain·DN+Bias (1)

[0064] In the formula: Gain is the calibration slope distance, the unit is W m -1 ·sr -1 ·μm -1 ; DN is the observed value of the satellite load; Bias is the calibration intercept, t...

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Abstract

The invention relates to a high resolution remote sensing image water body extraction method based on multi-feature combined treatment, comprising: performing radiation scaling on a remote sensing image, obtaining the ground feature apparent radiant quantity, and thereby performing threshold segmentation on pixel length characteristics to eliminate most non-water body pixels; performing threshold segmentation on the NDWI characteristics of water body pixels waiting for selection maintained in the last step, and obtaining a water body object waiting for selection; performing segmentation threshold again on the NDWI characteristics of pixels covered by a small area object waiting for selection, and further eliminating mixed background pixels; and finally using an area growth mode to perform water body edge optimization to obtain a final water body object mask. The method utilizes local structure length characteristics in water body extraction, embodies water body distribution characteristics, inhibits most shadow interference, avoids the problem that different characteristics can not be fully embodied caused by fusing characteristics in a direct classification mode, and automatically extracts water body with a fast running speed.

Description

technical field [0001] The invention relates to a method for extracting water bodies from high-resolution remote sensing images based on multi-feature joint processing. Background technique [0002] Surface water is an irreplaceable basic element for human survival and social development. Research on surface water plays an important role in climate modeling, agricultural stability, river change, wetland regulation, surface water survey and management, environmental monitoring and other fields. Accurately extracting the location, volume, and change information of surface water bodies is a key step for further water body research and formulation of relevant policies. Compared with traditional field survey methods, remote sensing technology provides an opportunity to quickly obtain surface water bodies, greatly reducing the time and labor costs for obtaining surface water body information. Therefore, water body extraction from high-resolution remote sensing images is a fundam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/11G06T7/136
CPCG06T2207/30181
Inventor 张永军张毅张彦峰
Owner WUHAN UNIV
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