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SAR image-based vehicle target feature extraction method

A technology of target features and extraction methods, applied in the field of remote sensing information processing, can solve problems such as reducing the degree of separation of background clutter, and achieve the effects of improving the identification performance and scope of application, reducing the amount of calculation, and reducing the probability of false alarms.

Inactive Publication Date: 2014-06-18
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

When the SAR image is distorted and distorted, the calculation results of most of the above-mentioned target features will have a large change, which reduces the degree of separation of the background clutter

Method used

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  • SAR image-based vehicle target feature extraction method
  • SAR image-based vehicle target feature extraction method
  • SAR image-based vehicle target feature extraction method

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Embodiment Construction

[0037] The method for calculating the vehicle target clearance characteristic of the SAR image provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0038] figure 1 It is a flow chart of the method for calculating the gap degree feature of the vehicle target in the SAR image provided by the present invention. The first step of the flow chart is to use the given smoothing window side length to perform windowing processing on the SAR image to be tested, and calculate the mass M in the smoothing window at any position (i, j) in the SAR image to be tested i,j,L ; The second step is to calculate the quality M in the smoothing window according to the formula (3) of the second step in the technical solution of the present invention i,j,L The probability of; the third step is to use the formula (4) of the third step in the technical solution of the present invention to calculate the gap degree characteristics of the vehic...

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Abstract

The invention provides an SAR image-based vehicle target feature extraction method. The technical scheme comprises the following steps of Step 1, performing windowing processing on an SAR image to be measured by utilizing the given side length of a smooth window, and calculating the mass Mi,j,L in the smooth window at any position (i,j) in the SAR image to be measured; Step 2, calculating the possibility of the mass Mi,j,L in the smooth window; Step 3, calculating the clearance degree feature of a vehicle target. The clearance degree feature extracted by the method has an affine invariant feature, is strong in identification performance, and is wide in application rage; furthermore, the method only relates to certain simple mathematical calculation, is small in calculation amount, and is convenient for engineering realization.

Description

technical field [0001] The invention belongs to the technical field of remote sensing information processing, and relates to a method for extracting vehicle target features from SAR (synthetic aperture radar, synthetic aperture radar) images. Background technique [0002] SAR is an active microwave imaging sensor with all-weather and all-weather working capabilities. It can realize large-area high-resolution imaging detection with the help of spaceborne, airborne or unmanned aerial platforms. In the field of earth observation There are a wide range of applications. Vehicle targets such as cars, trucks, tanks, armored vehicles, etc. are the key monitoring targets in SAR earth observation. The detection and identification of such targets is an important content of SAR image information acquisition. [0003] In the process of vehicle target detection and identification in SAR images, the constant false alarm detection strategy is often used to achieve target detection. Since o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/46
Inventor 李禹粟毅黄春琳陆珉王建唐涛朱宇涛
Owner NAT UNIV OF DEFENSE TECH
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