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SAR image registration method based on phase congruency and SIFT

An image registration and consistency technology, applied in the field of image processing, can solve problems such as poor results, and achieve the effects of improving filtering ability, improving accuracy, and enhancing robustness

Inactive Publication Date: 2014-07-09
XIDIAN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art above, and propose a synthetic aperture radar SAR image registration method based on phase consistency and scale-invariant feature transformation SIFT, which can better filter out a large number of images caused by multiplicative speckle noise. The wrong feature points, which solves the problem of poor effect in the prior art for synthetic aperture radar SAR image registration

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  • SAR image registration method based on phase congruency and SIFT
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  • SAR image registration method based on phase congruency and SIFT

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with accompanying drawing:

[0031] refer to figure 1 , the implementation steps of the present invention are as follows:

[0032] Step 1, input two images.

[0033] Choose one as the reference image and the other as the image to be registered.

[0034] Step 2, extract SIFT features.

[0035] Generate difference-of-Gaussian scale-space images of the reference image and the image to be registered.

[0036] Calculate the Gaussian difference scale-space image of the reference image and the image to be registered according to the following formula:

[0037] D. r =[G η -G σ ]*I r

[0038] D. s =[G η -G σ ]*I s

[0039] Among them, D r ,D s Denote the Gaussian difference scale-space images corresponding to the reference image and the image to be registered, G η , G σ Represents the Gaussian scale space images corresponding to the scale parameters η and σ respectively, η, σ both represent th...

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Abstract

The invention discloses an SAR image registration method based on phase congruency and SIFT. The problem that when a traditional SIFT method is applied to synthetic aperture radar, SAR image registration fails or accuracy is low is mainly solved. The method includes the implementing steps of (1) inputting two images, (2) extracting SIFT features, (3) screening feature points, (4) filtering out mismatch point pairs, (5) obtaining geometric deformation parameters and (6) obtaining a registration result. Compared with the prior art, the capacity for filtering out mismatch points is improved, robustness for noise is enhanced, and therefore accuracy of actually measured synthetic aperture radar SAR image registration is improved.

Description

technical field [0001] The present invention belongs to the technical field of image processing, and further relates to a synthetic aperture radar (Synthetic Aperture Radar, SAR) image matching based on phase consistency scale invariant feature transform (Scale Invariant Feature Transform, SIFT) in the technical field of radar image processing. standard method. The invention can be used for SAR image registration and image correction in different wave bands, different time phases and different polarization modes. Background technique [0002] Image registration is the process of matching and superimposing two or more images of the same scene taken at different times, different viewing angles or different sensors. Its main purpose is to eliminate or reduce the geometric deformation caused by different imaging conditions between the reference image and the image to be corrected, so as to obtain two images with geometric consistency (best spatial position matching). It has be...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06K9/46
Inventor 吴艳樊建伟张庆君王凡张强
Owner XIDIAN UNIV
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