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Image characteristic matching method

A feature matching and imaging technology, which is applied in image analysis, image data processing, instruments, etc., can solve the problem of fewer feature points and unfavorable stellar DEM generation.

Inactive Publication Date: 2012-09-26
THE PLA INFORMATION ENG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide an image matching method to solve the problem that the existing image matching method has fewer extracted feature points for deep space star images, which is not conducive to the DEM generation of stars

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Embodiment Construction

[0051] Such as figure 1 As shown, the Chang'e-1 CCD image feature matching method is used to describe in detail.

[0052] 1. The payload of Chang'e-1

[0053]The optical sensor on the Chang'e-1 satellite is a large area array CCD detector, and the three-line array images it acquires are the 11th, 512th, and 1013th lines on the area array detector perpendicular to the flight direction. Respectively as the CCD array of front view, front view and rear view. When the satellite is flying, the three CCD arrays can continuously scan the lunar surface to generate three overlapping flight belt images, that is, the forward-looking, rear-viewing and downward-looking images. The mission of the laser altimeter carried on the Chang'e-1 satellite is laser ranging. It has two scientific goals: (1) to measure the distance from the satellite to the sub-satellite point on the lunar surface; (2) to provide the radial height of the digital elevation model of the lunar surface data.

[0054] 2....

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Abstract

The invention relates to an image characteristic matching method. The image characteristic matching method includes the steps of pre-processing an obtained CCD (charge coupled device) image; extracting characteristic points of the pre-processed CCD image by a SURF operator and conducting matching image by the quasi epipolar line limit condition and minimum Euclidean distance condition to obtain the identical point information; establishing affine deformation relation between the CCD images according to the obtained identical point information; extracting the characteristic points of a reference image by Harris corner extracting operator, projecting the characteristics points to a searching image by the affine transformation to obtain points to be matched; in neighbourhood around the points to be matched, counting the correlation coefficient between the characteristic points and the points in the neighbourhood and taking extreme points as the identical points; and using the comprehensive results of twice matching as the final identical point information. According to the method of the invention, can match surface images of deep-space stars obtained in a deep-space environment is utilized for imaging matching to obtain high-precision identical point information of CCD images, so that the characteristic matching is realized.

Description

technical field [0001] The invention belongs to the technical field of planetary photogrammetry in photogrammetry and remote sensing technology, and relates to a CCD image feature matching method suitable for generation of planet surface DEM. Background technique [0002] Image matching technology is to establish the corresponding relationship between images. The feature-based image matching method is to compare the similarity between the features extracted in the image to realize the extraction of the same name point. The image features mainly include point, line and surface features. This type of method usually includes three steps: (1) Feature extraction: using interest operators to extract features on the image; (2) Determination of candidate features: comparing the attributes of the extracted features to obtain candidate features to be registered; (3) Feature correspondence: Correspond to the extracted features to obtain matching results. The advantage of this method ...

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Application Information

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IPC IPC(8): G06T7/00
Inventor 何钰徐青邢帅蓝朝桢周杨孙伟郭海涛靳国旺李建胜
Owner THE PLA INFORMATION ENG UNIV
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