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Image matching and positioning method based on point feature and contour feature fusion

A technology of contour features and positioning methods, which is applied in the fields of target tracking and visual navigation, can solve problems such as satellite remote sensing image matching difficulties, meet the needs of dynamic scenes, avoid mismatching problems, and improve matching accuracy

Active Publication Date: 2019-12-13
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

In order to solve the problem of difficult matching between the real-time map taken by the flight platform and the satellite remote sensing image in the background technology, the contour feature is used to constrain the distribution of point features, so that the contour feature constraints can be established between point features that do not have a correlation relationship, which improves the matching accuracy. The flying platform provides a visual navigation positioning method

Method used

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  • Image matching and positioning method based on point feature and contour feature fusion
  • Image matching and positioning method based on point feature and contour feature fusion
  • Image matching and positioning method based on point feature and contour feature fusion

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Embodiment Construction

[0061] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0062] The present invention utilizes the fusion of point features and contour features to perform image matching and positioning, referring to figure 2 , respectively extracting point features and contour features from the image (including image binarization, approximate fitting of contour edges, etc.), then fusing the point features and contour features, constructing a feature description vector for the fused features, and describing by matching features The mapping matrix of the real-time map and the reference map is obtained, and finally the coordinates of the center position of the optical axis of the real-time map are mapped to the reference map by using the mapping matrix, and the current position of the flight platform is determined by looking up the geographic information mapped to the points in the reference map, and the visual navigation posi...

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Abstract

The invention provides an image matching and positioning method based on point feature and contour feature fusion. The method comprises the following steps of after Point feature detection, calculating segmentation thresholds, binarizing images, searching through contour edge points; performing contour approximate fitting to fuse point features and contour features, performing feature descriptionand feature matching, performing mapping matrix point screening, calculating a mapping matrix and a matching position, mapping a real-time graph center coordinate to a reference graph, and performingcompensation according to flight platform attitude information to obtain current geographic position information of the flight platform. Point features of the method have intrinsic contour constraints. Mismatching points can be quickly and effectively eliminated through contour features. The method has following advantages in that a mismatching problem caused by single point feature matching is avoided, matching correctness is improved, heterogeneous image matching positioning of the flight platform shooting real-time image and the satellite remote sensing image reference image is realized through point feature and contour feature fusion, and relatively high correctness is realized compared with a present matching algorithm.

Description

technical field [0001] The invention relates to the field of visual navigation, and proposes an image matching and positioning method, which can be used for visual navigation and positioning of flight platforms, and can also be used in the fields of target tracking on flight routes of various flying platforms. Background technique [0002] Image matching refers to the establishment of a mapping relationship of part or all of the information between images for two or more scenes acquired under different shooting environments or shooting equipment. Image matching technology has a wide range of applications in many fields, including terrain and map matching positioning of missiles, visual navigation and so on. [0003] In the field of visual navigation, the real-time map of the current real-time position is obtained through the photoelectric equipment of the flight platform, and the real-time map is compared and matched with the reference map with geographic information. If the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/46G06K9/62
CPCG06V10/443G06V10/462G06V10/751
Inventor 王健魏红波
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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