Method and device for separating sea ice and seawater information in synthetic aperture radar images

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 present application relates to the field of satellite remote sensing ocean detection, in particular to a method and device for separating sea ice and sea water information in synthetic aperture radar images. Background technique [0002] Sea ice plays a vital role in the global heat balance, ocean water cycle and temperature and salt balance, thus affecting the global climate. Therefore, polar sea ice has attracted attention as the main component of sea ice. At present, synthetic aperture radar (Synthetic Aperture Radar, SAR) has become an important technical means of monitoring the ocean, therefore, using synthetic aperture radar to monitor polar regions has become the first choice of people. SAR images (images acquired by Synthetic Aperture Radar) contain sea ice information, sea water information, and other information. [0003] To obtain the current status of polar sea ice, sea ice information needs to be separated from SAR images. SAR images...

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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