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Superposition image preprocessing method based on principal direction restraining high-pass filter

A high-pass filter, superimposed image technology, applied in image data processing, image enhancement, image analysis and other directions, can solve problems such as false alarms, and achieve the effect of reducing false detection, improving detection rate, and suppressing undulating background.

Inactive Publication Date: 2018-02-27
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

Affected by this effect, there will be false alarms in target detection

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  • Superposition image preprocessing method based on principal direction restraining high-pass filter
  • Superposition image preprocessing method based on principal direction restraining high-pass filter
  • Superposition image preprocessing method based on principal direction restraining high-pass filter

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[0024] The accompanying drawings constituting a part of this application are used to provide a further understanding of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention:

[0025] Such as figure 1 Shown, specifically, provided by the present invention, comprises the following steps:

[0026] (1), the input superimposed image is subjected to Fourier transform;

[0027] (2), fuse the second-order Butterworth filter with the direction filter, and design a main direction suppression high-pass filter. The calculation formula of the filter is:

[0028]

[0029] (3), adopt the filter designed in step 2 to filter the Fourier transform result of the superimposed image obtained in step 1, and the calculation formula is as follows:

[0030]

[0031] (4) Perform inverse Fourier transform on the filtering result obtained in...

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Abstract

The invention provides a superposition image preprocessing method based on a principal direction restraining high-pass filter. A two-order Butterworth filter and a directional filter are fused, the direction restraining high-pass filter is obtained, background fluctuations are effectively restrained, the target detection rate is increased, the influence of the pearl string effect of fixed star superposition lines on target detection is weakened, and the problem that virtual detection appears in target detection is effectively solved. The superposition image background fluctuations can be restrained, the detection rate can be effectively increased, the influence of the pearl string effect generated by fixed star superposition lines on echogenic mass target detection can be weakened, and theproblem that virtual detection appears in detection is solved.

Description

technical field [0001] The invention belongs to the technical field of weak and small target detection in images, and in particular relates to an image preprocessing technology based on a main direction suppression high-pass filter. Background technique [0002] When the deep space detection system adopts the target tracking mode, that is, the detection system tracks the target according to the movement mode, the imaging of the target is in the shape of Gaussian spots, and the stars in the deep space will show a trailing shape. And when the tracking parameters are more accurate, the position of the weak target to be detected in the image basically does not change. However, when the noise in the background is strong, the weak objects in a single frame image are relatively weak and difficult to be detected. Assuming that the background random noise obeys the same distribution, the noise can be weakened by superposition, and the signal-to-noise ratio of the target will be enha...

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Application Information

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IPC IPC(8): G06T5/00
CPCG06T2207/10016G06T2207/20056G06T2207/20024G06T5/70
Inventor 雷志辉侯旺孙晓亮尚洋张文龙
Owner NAT UNIV OF DEFENSE TECH
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