Multi-temporal POLSAR image registration method based on SAR-SIFT feature

Abstract

The invention relates to a multi-temporal POLSAR image registration method based on SAR-SIFT features. In the multi-temporal POLSAR image registration process, a multi-dimensional polarization scattering vector is constructed by combining polarization scattering components to calculate the gradient of a pixel point. According to the method, the problem that polarization information in the image cannot be fully utilized during POLSAR image registration in the prior art is solved. The feature point extraction precision in the registration process is effectively improved, a registration algorithmhas high performance, and an efficient registration task is achieved. In a process of constructing a scale space during multi-temporal POLSAR image registration, the total variation model is adoptedto replace Gaussian convolution, so that more detail information is reserved in the constructed scale space, speckle noise in the image can be effectively filtered out, stable feature points are extracted, mismatching point pairs are eliminated, and the accuracy and robustness of the multi-temporal POLSAR image registration algorithm are improved.

Description

technical field [0001] The invention relates to the technical field of polarization synthetic aperture radar, and relates to a multi-temporal POLSAR image registration method based on SAR-SIFT features. Background technique [0002] The polarimetric synthetic aperture radar system adopts a multi-antenna and multi-channel design, which can obtain the polarization scattering information of ground objects by transmitting and receiving echo combinations of different polarization modes, including energy intensity, phase, polarization characteristics, etc. Therefore, POLSAR images have high practical value in military and civilian fields. Image registration is the process of registering two or more images of the same scene acquired at different times and from different perspectives. Therefore, POLSAR image registration technology can provide support for later target recognition, image fusion, change detection, etc. Basic data, and further applied in the fields of disaster detecti...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the inevitable coherent speckle noise in POLSAR images will interfere with the feature point extraction process, the present invention provides a feature based on SAR-SIFT The multi-temporal POLSAR image registration method, the invention provides the following technical solutions:

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