Complex image registration method and complex image registration system of airborne interferometric synthetic aperture radar

A technology of interferometric synthesis of apertures and complex images, applied in the field of image processing, can solve problems such as large amount of calculation, deviation, large calculation time cost, etc., and achieve the effect of improving accuracy and avoiding large fluctuations

Active Publication Date: 2017-03-22
BEIJING INST OF RADIO MEASUREMENT
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Problems solved by technology

Such a processing method has the following two defects: 1) the fine registration calculates the registration index in an independent local small search window, and in the low coherence area of ​​the signal, the estimated result is likely to have a large deviation; 2) the full image The calculation of sub-pixel interpolation and subsequent search window matching index calculation is huge, requiring huge calculation time cost

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  • Complex image registration method and complex image registration system of airborne interferometric synthetic aperture radar
  • Complex image registration method and complex image registration system of airborne interferometric synthetic aperture radar
  • Complex image registration method and complex image registration system of airborne interferometric synthetic aperture radar

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Embodiment 1

[0030] Embodiment 1. An airborne interferometric synthetic aperture radar complex image registration method.

[0031] see figure 1 , the complex image registration method provided in this embodiment includes:

[0032] S1. From the two complex images used for registration, determine one complex image as the main image, and the other as the secondary image, divide the two complex images into matrix blocks on average according to a certain size, and form corresponding matrix block complex images right;

[0033] S2, perform rough registration on each matrix block complex image pair according to the complex correlation function method, and obtain rough registration parameters of each matrix block complex image pair;

[0034] S3, subdivide each matrix block complex image pair step by step to form sub-block complex image pairs at each level, and perform complex correlation function method on each sub-block complex image pair at each level according to the level Obtain the fine reg...

Embodiment 2

[0064] see Figure 4 Next, an airborne interferometric synthetic aperture radar complex image registration method according to another embodiment of the present invention will be described, including the following steps:

[0065] S1, determine one complex image from the two complex images used for registration as the main image, and the other as the secondary image, and divide the two complex images into matrix blocks on average according to a certain size to form corresponding matrix block complex images right;

[0066] S2, perform rough registration on each matrix block complex image pair according to the complex correlation function method, and obtain rough registration parameters of each matrix block complex image pair;

[0067] S2', coarse registration parameters for all matrix block-complex image pairs of two complex images Using the median filtering method to filter, the coarse registration offset of each matrix block complex image pair is obtained by removing the si...

Embodiment 3

[0092] Embodiment 3. An airborne interferometric synthetic aperture radar complex image registration system.

[0093] see Figure 5 , the complex image registration system provided in this embodiment includes a rough division module 21 , a rough registration module 22 , a fine registration module 23 , an interpolation calculation module 24 and a complex image registration module 25 .

[0094] The rough division module 21 is used to determine one complex image as the main image and the other as the secondary image from the two complex images that need to be registered, and divide the two complex images into matrix blocks on average according to a certain size to form corresponding Matrix block-complex image pair;

[0095] The coarse registration module 22 is used for carrying out coarse registration to each matrix block complex image pair according to the complex correlation function method, and obtains the coarse registration parameters of each matrix block complex image pair...

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Abstract

The invention discloses a complex image registration method and complex image registration system of an airborne interferometric synthetic aperture radar. The registration method includes the following steps that: two complex images are divided into blocks equally, and coarse registration is performed on each complex image pair block, so that the coarse registration parameter of each complex image pair block is obtained; and level-by-level subdivision is performed on each complex image pair block, the registration offset of each complex image pair block on each level is obtained through using a complex correlation function method according to levels, and the registration offset of each complex image pair block on the last level which is obtained through calculation is the final fine registration parameter of the complex images. According to the complex image registration method and complex image registration system of the present invention, the initial complex images are divided into small complex image blocks, offset used in registration calculation at each level is obtained through adding a smaller offset step quantity into offset obtained by the registration of larger image blocks at upper levels, and therefore, the large fluctuation of registration results caused by low-correlation regions can be avoided, and the accuracy of the registration of the complex images can be improved.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an airborne interferometric synthetic aperture radar complex image registration method and a complex image registration system. Background technique [0002] Interferometric Synthetic Aperture Radar (InSAR) technology is a new technology that uses the phase information of synthetic aperture radar complex image data to extract high-precision digital elevation (DEM) information of the surface. [0003] Airborne Interferometric Synthetic Aperture Radar (ISAR) uses an aircraft as a platform to obtain complex image pairs of the same scene on the ground through simultaneous observation by two radar antennas. After the radar echo data acquired by the airborne interferometric synthetic aperture radar is processed by imaging, two chorus aperture radar images with slight differences are obtained. To obtain clear interferometric phase maps and 3D topographic maps, complex image re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/30
Inventor 韦立登李爽李军孟飞
Owner BEIJING INST OF RADIO MEASUREMENT
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