Method for realizing image registration of synthetic aperture radar (SAR) by using three components of monogenic signals

Abstract

The invention discloses a method for realizing image registration of a synthetic aperture radar (SAR) by using three components of monogenic signals, belonging to the technical field of image processing and registration of SARs. The conventional gradient information-based detection method and cross correlation matching method have the defects of excessive detected characteristic points, overlong detection time, low registration accuracies and the like when applied to image registration of an SAR. A method for matching a detection algorithm of monogenic signal phase congruency with monogenic signal phase correlation is given, and three orthogonal monogenic signal component signals are generated by designing a frequency domain Log-Gabor filter. One path of the monogenic signal component signals is transmitted to a characteristic detector, i.e., a local amplitude and a local phase are resolved by using three components to construct a monogenic signal phase congruency function for detecting the phase congruency characteristic. Another path of the monogenic signal component signals is transmitted to a matcher, and a characteristic description vector is constructed by using three components of the monogenic signals; a characteristic vector correlation matrix is obtained by calculating the characteristic vector correlation of a reference image and characteristic points in an image to be registered; and largest line elements and column elements in the characteristic vector correlation matrix are searched and are indexed to a coarsely-matched characteristic point pair, so that coarse characteristic matching is realized. An affine basic matrix is fitted by using an RANSAC (Random Sample Consensus Algorithm), so that accurate matching of characteristic points is completed. An affine conversion model is used for realizing image registration of the SAR. The algorithm disclosed by the invention has the advantages of realization of automatic registration of SAR images, high registration speed, small influence by speckle noise, high registration accuracy and popularization and application values.

Description

1. Technical field [0001] The invention belongs to the technical field of image processing and registration, in particular to the registration technology of Synthetic Aperture Radar (SAR) images. 2. Background technology [0002] In modern combat systems, in order to meet the needs of military target reconnaissance and surveillance and dynamic perception of complex battlefield environments, it is necessary to construct multiple sensors with different spectral frequency bands, different working modes, and different spatial resolutions mounted on different reconnaissance platforms. An integrated early warning detection system. However, images obtained by multiple detection methods in the same area must have position translation, perspective changes, scale differences, and geometric deformations, which directly affect the consistency of military intelligence. Before multi-source image target detection and recognition, the images must be aligned in space, which is the registrat...

AI Technical Summary

Problems solved by technology

However, for SAR images, the traditional PC detection method has weaknesses such as a large number of detected feature points, many false targets, and low positioning accuracy of feature points.

Images