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Three-dimensional compressed imaging method and device based on phase position distance measurement principle

A technology of phase ranging and compression imaging, which is applied in measuring devices, electromagnetic wave re-radiation, radio wave measuring systems, etc., can solve the problems of high requirements for measuring equipment, low precision, and high requirements for devices, so as to reduce sampling and transmission, improve Probing the effect of signal-to-noise ratio, reducing speed requirements

Inactive Publication Date: 2014-08-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a three-dimensional compressed imaging method and device based on the principle of phase ranging in order to solve the problems of low precision and high requirements for measuring equipment in the prior art
The system can effectively solve the problem that the existing compressive sensing laser ranging method that uses high-frequency pulsed laser for three-dimensional imaging has too high requirements on the device, and further improves the ranging accuracy.

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  • Three-dimensional compressed imaging method and device based on phase position distance measurement principle
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  • Three-dimensional compressed imaging method and device based on phase position distance measurement principle

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Embodiment 1

[0034] Based on the three-dimensional compressed imaging method of the phase ranging principle, the present invention uses the compressed sensing recovery algorithm (BP or OMP) to study the recovery method of the phase difference of each point echo on the target surface, so as to achieve the purpose of three-dimensional imaging. The specific implementation process is as follows :

[0035] Step 1. Use a cosine signal generator with a frequency of 10MHz at the transmitting end to drive the semiconductor laser to emit a cosine continuous wave, and illuminate the target at a distance of 10m in the form of a surface laser through a collimated beam expander system;

[0036] Step 2: Set the imaging two-dimensional resolution to 16×16, and the echo reflected by the target is imaged on the digital micromirror array; the digital micromirror array flip is set to 64 times, that is, the compression ratio of the three-dimensional compressed imaging is 1:4, The kth (1≤k≤64) measurement matri...

Embodiment 2

[0058] Step 1. Use a cosine signal generator with a frequency of 1MHz at the transmitter to drive the semiconductor laser to emit a cosine continuous wave, and illuminate the target at a distance of 70m in the form of a surface laser through a collimated beam expander system;

[0059] Step 2: Set the two-dimensional resolution of the imaging to 64×64, and the echoes reflected by the target are imaged on the digital micromirror array; the flipping of the digital micromirror array is set to 512 times, that is, the compression ratio of the three-dimensional compressed imaging is 1:8, For the kth (1≤k≤512) measurement matrix Indicates that other micromirrors are in a fixed state of reflecting light out of the optical path; all measurement matrices are arranged as a total coding matrix C (512 rows × 4096 columns), in which part of the echoes received by the micromirrors transformed according to the value of "1" will be Perform photoelectric conversion to obtain the total echo x R...

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Abstract

The invention relates to a laser three-dimensional compressed imaging technology, in particular to a three-dimensional compressed imaging method and device based on a phase position distance measurement principle, and belongs to the field of laser imaging and digital image processing. The recovery method of the phase position difference of echo of each point of a target surface is studied through a compressed sensing recovery algorithm, and therefore the purpose of three-dimensional imaging is achieved. The three-dimensional compressed imaging device based on the phase position distance measurement principle comprises a cosine signal generator, a semiconductor laser, a collimation and beam expanding module, an imaging optical system, a semi-reflective semi-transmittance lens, a digital micro mirror array, a focusing lens, an avalanche photodiode, a phase measurement module, a central processing module and a DMD driving module. The three-dimensional compressed imaging method and device based on the phase position distance measurement principle can further improve the distance measurement accuracy, and lower the requirement for the speed of an AD converter.

Description

technical field [0001] The invention relates to laser three-dimensional compressed imaging technology, in particular to a three-dimensional compressed imaging method and device based on the principle of phase ranging, belonging to the field of laser imaging and digital image processing. Background technique [0002] With the development of society, non-contact 3D measurement puts forward higher requirements for accuracy and speed. Three-dimensional measurement often adopts the laser ranging method, which can better adapt to the complex environment in the field and obtain a longer range and higher resolution than the robot vision method and the structured light method; at the same time, due to the superior directivity and Monochromaticity, compared with microwave imaging methods, will greatly improve the three-dimensional imaging accuracy. At present, the three-dimensional imaging methods of laser range finders are divided into two categories: scanning and non-scanning. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/89
CPCG01S17/89G01S7/48
Inventor 魏平郭冰冰魏力中柯钧
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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