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Orbital invader detection method based on orbit visual characteristic spectrum

A technology of visual features and intrusions, applied in the fields of instruments, railway signals and security, character and pattern recognition, etc., can solve the problems of being easily affected by the surrounding environment, unable to be applied, and the template needs to be updated in real time.

Active Publication Date: 2017-09-15
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is easily affected by the surrounding environment, and the template needs to be updated in real time, so it cannot be applied to the UAV-borne intrusion detection system

Method used

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  • Orbital invader detection method based on orbit visual characteristic spectrum
  • Orbital invader detection method based on orbit visual characteristic spectrum
  • Orbital invader detection method based on orbit visual characteristic spectrum

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Embodiment 1

[0074] The present invention aims at the shortcomings of the existing track intruder detection system that can only detect at fixed points, is greatly affected by environmental changes, and has a slow detection speed, and in order to meet the characteristics of the small load of the UAV and the high real-time performance of the detection system, the track visual feature spectrum is proposed Theory and its construction method, and based on this theory, a feature matching intrusion detection method is proposed.

[0075] The processing flow of the track intruder detection method based on the track visual feature spectrum proposed by the embodiment of the present invention is as follows: figure 1 As shown, it mainly includes the following processing procedures:

[0076] (1) Constructing the visual feature spectrum of the track. The present invention defines the visual feature spectrum of the track as: extracting image features such as image rotation, brightness, viewing angle, cla...

Embodiment 2

[0131] figure 2 Schematic diagram of a sample orbital feature database constructed after a variety of affine transformations for images of a certain orbital interval segment, in which the rotating image library (a) is obtained by a camera at a fixed position by rotating itself; brightness changes and sharpness The changing image library (b) (d) is obtained by changing the camera's aperture and focal length; the viewing angle and scale changing image library (c) (e) is obtained from different viewing angles and different shooting distances at the same location The images are obtained separately; the compression ratio change image library (f) is obtained by JPEG2000 image compression standard after processing with different compression ratios. image 3 is the image for orbit positioning, where (a) is the original image of the orbit taken by the UAV, (b) is the gradient image obtained after calculating the Sobel gradient direction field and thresholding, (c) is the image after i...

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Abstract

The present invention provides an orbital invader detection method based on an orbit visual characteristic spectrum. The method comprises: cruising and capturing an image along an orbital line at a certain height, angle and speed, and by using image data, establishing a feature image library for 6 image capturing and affine changes, and constructing a orbit visual feature spectrum based on the orbit feature image library; and performing feature matching by using the orbit visual feature spectrum and a feature of a to-be-detected orbit image , and according to a matching result, determining whether an orbit invader exists in the to-be-detected orbit image. The orbital invader detection method based on an orbit visual characteristic spectrum provided by the present invention can be employed into the invader detection system based on UAV, and solves the problem that the conventional detection system has poor reliability and high costs. The method has a fast feature extraction and matching speed, and can effectively invaders in the orbit, and can be applied to the invader detection system based on UAV.

Description

technical field [0001] The invention relates to the technical field of track safety detection, in particular to a track intruder detection method based on track visual feature spectrum. Background technique [0002] The mileage of rail transit, especially in the complex landform environment in the west, is constantly increasing, the construction of high-speed railways in Asia and Europe, and the impact of the severe international security situation enable the rapid identification method and Technology becomes an urgent need. [0003] In our country's existing track safety detection system, we mainly use fixed-point installation of monitoring cameras and real-time observation of duty personnel to check the status of track lines. This method needs to install cameras in point distribution on the track line, and the installation and maintenance costs are high. At the same time, it cannot be popularized and used under the influence of harsh and complex landform environments such...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/46B61L23/04
CPCB61L23/041G06V20/13G06V10/443
Inventor 李晓峰管岭杨晗贾利民
Owner BEIJING JIAOTONG UNIV
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