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A heterogeneous image matching method based on refined feature optimization extraction

A heterogeneous image and feature optimization technology, which is applied in the field of radar image interpretation, can solve the problems of poor matching timeliness, insufficient stability, and low matching accuracy, and achieve the effect of not being easily disturbed by noise, ensuring the effectiveness of the algorithm, and ensuring the matching accuracy

Active Publication Date: 2019-03-01
XIDIAN UNIV
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Problems solved by technology

[0008] The purpose of the present invention is to propose a heterogeneous image matching method based on refined feature optimization extraction to solve the problems of poor matching timeliness, insufficient stability and low matching accuracy in the above-mentioned prior art, and provide accurate target scenes for aircraft guidance and location information

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  • A heterogeneous image matching method based on refined feature optimization extraction
  • A heterogeneous image matching method based on refined feature optimization extraction
  • A heterogeneous image matching method based on refined feature optimization extraction

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[0029] Embodiment and effect of the present invention are described in detail below in conjunction with accompanying drawing:

[0030] refer to figure 1 , the implementation steps of the present invention include as follows:

[0031] In step 1, different operators are used to calculate the gradient modulus and direction of the two images.

[0032] (1a) Calculate the optical image gradient modulus and direction:

[0033] (1a1) the optical image I O Respectively with the Sobel template m in the x direction x and the Sobel template m in the y direction y Convolve to get the gradient M of the image in the x direction x and the y-direction gradient M y ,in

[0034] (1a2) According to the gradient of the optical image in the x direction and the y direction, calculate the gradient modulus M of the optical image O and direction θ O :

[0035]

[0036] (2a) Calculate the SAR image gradient modulus and direction:

[0037] (2a1) The Gaussian-Gamma double-window function...

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Abstract

The invention discloses a different-source image matching method based on refined feature optimization extraction, which mainly solves the problem of low matching precision in the prior art, and adopts the technical scheme that 1, gradient moduli and directions of an optical image and an SAR image are calculated by adopting different gradient operators respectively; 2, completing region-of-interest calibration by utilizing the specific property of the target in the image; 3, according to the result of the step 1, obtaining edge features of the interested areas of the two images, and obtaininga coarse matching affine transformation matrix between the two images through template matching; 4, obtaining a transformed optical image by using the coarse matching affine transformation matrix, andthen extracting refined features; 5, performing preliminary matching on the refined features, and eliminating singular point interference to obtain a fine matching affine transformation matrix; and 6, obtaining a final affine transformation relation matrix between the optical image and the SAR image according to the results of the steps 3 and 5. The method can achieve the precise registration ofa heterologous image, and can be used for the guidance of an aircraft.

Description

technical field [0001] The invention belongs to the technical field of radar image interpretation, in particular to a registration method for heterogeneous images, which is suitable for providing more accurate target information for aircraft guidance. Background technique [0002] Satellite remote sensing is an effective means for human beings to observe, analyze and describe the earth environment in which they live. With the development of remote sensing technology, there are more and more types of sensors, and the resolution is getting higher and higher. Image registration with the same resolution has developed to the current multi-band, multi-resolution and multi-imaging mode image registration. The information obtained by a single sensor cannot meet the needs of the application. For example, in the processing of geological disasters, multiple sensor information such as synthetic aperture radar SAR, hyperspectral imaging systems, and infrared night vision devices are ofte...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/46G06T7/33
CPCG06T7/337G06V20/13G06V10/44
Inventor 李亚超胡思茹朱天启全英汇项宇泽
Owner XIDIAN UNIV
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