Method for extracting relative shake information of target in three-dimensional image

Abstract

The invention relates to a method for extracting relative shake information of a target in a three-dimensional image. The method includes the steps of converting original echo into a distance compressed domain according to the form of transmitted signals to obtain signals S1 (x, y and z); acquiring absolute values of the signal S1 (x, y and z), and accumulating the absolute values in an x-direction to obtain an accumulated signal S21 (y and z); subjecting two adjacent sequences of the signal S21 (y, z) in a y-direction to related processing, and marking a signal at a peak as a signal dez (y); subjecting the signal dez (y) to y-directional integration to obtain a relative movement displacement signal ez (y) of the target; enveloping and aligning the signals S1 (x, y and z) through the relative movement signal ez (y) to obtain signals S3 (x, y and z); acquiring two two-dimensional sequences in the y-direction from the signals S1 (x, y and z) or the signal S3 (x, y and z), conjugating one two-dimensional sequence, multiplying the same by the other two-dimensional sequence, and acquiring a phase, marked as dep (y), of an average result of a product; subjecting the phase dep (y) to y-directional integration to obtain a relative movement initial-phase signal ep (y) of the target.

Description

technical field [0001] The invention belongs to the technical field of target imaging, and in particular relates to a method for extracting relative shaking information of a target in three-dimensional holographic imaging. Background technique [0002] In recent years, with the escalation of terrorist activities, the safety of public areas has attracted more and more attention. How to conveniently and effectively monitor the weapons and explosives hidden in the human body is still a big problem that plagues people. Compared with other imaging systems, microwave, millimeter wave and terahertz wave imaging have unique advantages in the field of human body security inspection: Compared with visible light, microwave, millimeter wave and terahertz wave can penetrate non-polar materials such as clothing, wood and foam ; Compared with X-rays, it is basically harmless to the human body. [0003] Compared with other imaging methods, microwave, millimeter wave and terahertz wave thr...

AI Technical Summary

Problems solved by technology

However, in the actual imaging process, in order to maintain its own balance, the human body will shake slightly visible to the naked eye. The shaking range is on the order of millimeters to centimeters, which is relatively close to the wavelength of microwaves, millimeter waves and terahertz waves. The image reconstruction has a great impact, and often cannot be reconstructed to get a clear image

For eliminating the influence of human shaking on the reconstruction of 3D holographic images, the biggest difficulty lies in extracting human shaking. At present, there is no effective way to realize the extraction of human shaking

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