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Method for enhancing moving target through multi-linear-array time difference scanning expansion sampling

A technology of scanning expansion and moving targets, which is applied in the field of moving target enhancement of multi-line time-difference scanning expansion sampling, which can solve the problems of limited target enhancement effect and no use of moving information, so as to improve accuracy, reduce gray scale difference, improve The effect of the signal-to-noise ratio

Active Publication Date: 2014-11-12
CHINA ACADEMY OF SPACE TECHNOLOGY
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Problems solved by technology

The traditional method is based on the image acquired by the detector, and uses signal analysis and image processing methods to enhance the target without using the motion information of the target, so the target enhancement effect has certain limitations

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  • Method for enhancing moving target through multi-linear-array time difference scanning expansion sampling
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  • Method for enhancing moving target through multi-linear-array time difference scanning expansion sampling

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Embodiment Construction

[0033] The present invention will be described in detail below in conjunction with the accompanying drawings and examples. A multi-line time-difference scanning moving target enhancement method, the flow chart is as follows image 3 As shown, the steps are as follows:

[0034] (1) Construct a multi-line time-difference scanning extended sampling detection device, which includes an optical system 1, a scanning mechanism 2 and a multi-line detector 3; the scanning structure includes a pendulum mirror and a driving shaft thereof; the multi-line The column detector is a two-line column detector, and the line column detector adopts N t The instantaneous field of view corresponding to the pixel is IFOV. Two adjacent detection arrays are arranged in parallel and staggered by 1 / N in the vertical scanning direction. t pixels, and set the detection array to sample S in the scanning direction and within a sampling length t times; the sampling length is the instantaneous field of view ...

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Abstract

The invention provides a method for enhancing a moving target through multi-linear-array time difference scanning expansion sampling. The method includes the steps that (1) a multi-linear-array time difference scanning expansion sampling detection device is constructed, and Nt detection arrays in each linear array detector in the multi-linear-array time difference scanning expansion sampling detection device are made to conduct imaging at the same time to obtain Nt groups of image data; (2) the Nt groups of image data of each linear array detector are processed to form a frame detection image; (3) after the preset sampling frequency is completed in the scanning direction, the frame detection images obtained by the linear array detectors correspondingly are spliced according to time to obtain two sub-pixel images; (4) non-uniformity correction is conducted on the two sub-pixel images respectively; (5) the sub-pixel image corresponding to the linear array detector which conducts imaging firstly is used as a standard, the sub-pixel image corresponding to the linear array detector which conducts imaging later is moved forwards in the scanning direction; (6) after the two sub-pixel images are matched, difference calculation is conducted to obtain a residual image; (7) enhancement processing is conducted on the residual image after filtering is conducted on the residual image.

Description

technical field [0001] The invention belongs to the field of image processing, and relates to a moving target enhancement method of multi-line time-difference scanning extended sampling. Background technique [0002] The research on detection technology of weak and small moving targets in complex background has important applications in civil, aerospace and military. Optical target detection systems generally use a single detector for detection and imaging. Due to the long imaging distance, the target is equivalent to a point source signal, and the detection image lacks sufficient texture information and shape information. At the same time, due to the influence of complex background clutter, the signal-to-noise ratio of the target in the image is very low, which greatly increases the difficulty of detecting weak targets. In order to improve the performance of target detection, it is necessary to perform target enhancement processing on the detection image to improve the sig...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 金挺王世涛高宏霞董小萌
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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