SAR image registration method based on salient division sub-region pair

An image registration and segmentation technology, which is applied in image enhancement, image analysis, image data processing, etc., can solve the problems of inconsistency of segmentation results, area matching interference, and poor correspondence of control points of polygon fitting.

Active Publication Date: 2015-03-04
XIDIAN UNIV
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Problems solved by technology

When the consistency program of the segmented area is not high, it will bring interference to the regional matching of geometric information such as Hu invariant moments, edge chain codes, area area, and perimeter length that describe the area shape information, and based on the area structure or boundary The center of mass and the contr

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  • SAR image registration method based on salient division sub-region pair
  • SAR image registration method based on salient division sub-region pair
  • SAR image registration method based on salient division sub-region pair

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[0079] The specific implementation and effects of the present invention will be further described in detail below with reference to the accompanying drawings.

[0080] refer to figure 1 , the realization steps of the present invention are as follows:

[0081] Step 1. Input two SAR images of N rows and N columns in the same area acquired at different time phases, denoted as I and J respectively, and the gray scale of the images ranges from 0 to 255.

[0082] Step 2: Mean filtering is performed on the phase 1 image I and the phase 2 image J respectively, and then histogram equalization is performed to obtain two filtered and equalized images, which are denoted as E and F respectively. Wherein, the size of the neighborhood of the mean value filter is m×m pixels, and the range of m is 3-8, and the value of m is 7 in the example of the present invention.

[0083] Step 3: Carry out salient region segmentation based on spectral residuals on the filtered and equalized image E, and m...

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Abstract

The invention provides an SAR (Synthetic Aperture Radar) image registration method based on a salient division sub-region pair. The SAR image registration method comprises the following steps: 1) inputting SAR images of two time phases in the same region; 2) carrying out average filtering and histogram equalization on the two SAR images to suppress coherent spots; 3) carrying out salient region division based on frequency spectrum residual error on the two filtered and equalized images; 4) calculating a minimum euclidean distance between the saliently divided region of the two images by utilizing a histogram mode-sorted grayscale sequence; 5) calculating registration parameters for a matching region by utilizing an improved comprehensive learning particle swarm optimization algorithm; 6) converting the registration parameters into registration parameters of an original image pair by utilizing a coordinate relationship between a sub-region in which a pixel point is positioned and an original image to obtain final registration results. The SAR image registration method solves the registration problem under a situation of non-ideal region division consistence through an existing method and the problem of large registration calculation amount based on grayscale information, and is used for change detection, terrain classification, map correction, data fusion and the like.

Description

technical field [0001] The invention belongs to the technical field of digital image processing, uses similar area information in two images for registration, and is the basis for applications such as change detection, ground feature classification, map correction, and data fusion; SAR image registration method. Background technique [0002] Synthetic Aperture Radar (SAR) has the characteristics of all-weather, all-time, cloud and surface penetration, and is widely used in hydrology, geological mines, environmental monitoring, military and other fields. However, due to the different shooting conditions of the original data, there are relative geometric differences between images, and image registration technology to correct image differences becomes a prerequisite for further image processing. [0003] Based on the idea of ​​​​region-based registration, most of the two images are first segmented, and then the segmented regions of the two images are matched, and then the con...

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Application Information

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IPC IPC(8): G06T7/00
CPCG06T7/33G06T2207/10044
Inventor 王桂婷焦李成刘孝先钟桦张小华田小林王爽侯彪马文萍
Owner XIDIAN UNIV
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