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Image matching based quick and accurate target positioning method

A precise positioning and target technology, applied in the field of target positioning, can solve the problems of lack of scale invariance and low accuracy of feature points between images.

Active Publication Date: 2017-08-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

Problems solved by technology

The FREAK algorithm simulates the imaging characteristics of the human retina to set sampling points and select corresponding point pairs, and uses glance search to match feature vectors. It is a binary descriptor with stable performance. Compared with SIFT and SURF algorithms, it is more efficient. Robustness, and the calculation process is much faster than the two, but it does not have scale invariance. In the case of large and small differences in the scene between images, the accuracy of matching pairs of feature points between images is low.

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  • Image matching based quick and accurate target positioning method
  • Image matching based quick and accurate target positioning method
  • Image matching based quick and accurate target positioning method

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Embodiment Construction

[0067] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0068] A fast and precise target positioning method based on image matching, such as figure 1 As shown, it includes three parts: fast target extraction algorithm, fast image matching algorithm and target high-precision positioning algorithm.

[0069] (1) Fast target extraction algorithm (such as figure 2 shown)

[0070] (1) Use the FAST algorithm to detect the feature points of the target image

[0071] Define a circular area, take any point in the target measured image as the center P of the circular area, and compare the gray value at the center P with the gray value of 16 pixels in the neighborhood:

[0072] |m-p i |>Δd,1≤i≤16

[0073] In the above formula, m is the gray value at the center P of the circle, p i is the gray value of the i-th point in the neighborhood of point P, and Δd is the preset threshold; if the number of pixe...

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Abstract

The invention discloses an image matching based quick and accurate target positioning method. First, a quick target extracting algorithm is utilized for processing a target actual measurement image sequence and to-be-positioned target effective pixels are extracted from the target actual measurement image sequence. A quick image matching algorithm is utilized for matching an actual measurement image subjected to target extraction and an onboard reference image. Finally, a target high accuracy positioning algorithm is utilized for processing a quick image matching result so as to obtain target position information. Compared with a prior target positioning method, the method provided by the invention has substantially improved real time performance and accuracy in target positioning.

Description

technical field [0001] The invention belongs to the technical field of target positioning, and in particular relates to a fast and precise target positioning method based on image matching. Background technique [0002] Reconnaissance aircraft, missiles, unmanned aerial vehicles, etc. need to accurately locate important targets when performing tasks, and the accuracy and efficiency of target positioning directly determine the success or failure of the mission. Most of the existing target positioning methods adopt geometric positioning methods and image matching positioning methods. The accuracy of geometric positioning is affected by the accuracy of the aircraft's own navigation system and geometric measurement information, resulting in large target positioning errors. Image matching positioning obtains the precise position information of the target point by matching the measured image obtained by the aircraft shooting the target with the airborne reference image. With the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/246G06T7/70
CPCG06T2207/10016G06T2207/30181G06T2207/30212
Inventor 曾庆化潘鹏举陈艳王云舒刘建业刘昇张月圆
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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