Separation method and device of sea ice and sea ice information in synthetic aperture radar image

Abstract

The invention provides a separation method and device of sea ice and sea ice information in a synthetic aperture radar image. The method comprises steps of calculating at least two texture features of HV or VH cross polarization images in a to-be-separated synthetic aperture radar image; determining the gradient matrix of at least one target texture feature in the at least two texture features; determining point sets including the gradient maximum values or minimum values in the gradient matrix; determining multiple maximum value points near each point in the point sets and determining closed regions consisting of the multiple maximum value points to spot blocks; determining spot blocks whose energy average values are larger than a preset energy threshold value as sea samples, and determining spot blocks whose entropy average values are larger than a preset entropy threshold value as sea ice samples; and based on the sea ice samples and the sea samples, separating sea ice information and sea information from the synthetic aperture radar image. According to the invention, under the premise of ensuring the accuracy of the sea ice samples and the sea samples, automatic determination of the sea ice samples and the sea samples is achieved.

Description

technical field [0001] The application relates to the field of satellite remote sensing ocean detection, in particular to a method and device for separating sea ice and seawater information in synthetic aperture radar images. Background technique [0002] Sea ice plays a vital role in global thermal balance, ocean water circulation and temperature-salinity balance, thus affecting global climate. Therefore, polar sea ice, as the main component of sea ice, has attracted much attention. At present, Synthetic Aperture Radar (SAR) has become an important technical means to monitor the ocean. Therefore, using SAR to monitor polar regions has become the first choice for people. SAR images (images acquired by synthetic aperture radar) contain sea ice information, seawater information, and other information. [0003] In order to obtain the status of polar sea ice, it is necessary to separate sea ice information from SAR images. SAR images can be divided into three categories: singl...

AI Technical Summary

Problems solved by technology

[0004] The inventor found during the research process that in the prior art, in the process of obtaining the classification model, sea ice and seawater samples were manually extracted, which increased the workload of people

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