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Active imaging method and system based on compressed sampling

An imaging system, compressed sampling technology, applied in radio wave measurement system, electromagnetic wave re-radiation, utilization of re-radiation, etc., can solve problems such as slow speed, inability to obtain high-speed images and videos, and limit the application range of single-pixel imaging

Active Publication Date: 2017-04-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has a big defect, that is, the digital micromirror array is usually a micromechanical structure or a liquid crystal device, which makes the speed of the micromirror array too slow when adjusting the random matrix, and the imaging speed is greatly reduced, not exceeding 100 frames per second, which makes the single-pixel imaging system can only be used to capture still or quasi-still images, but cannot obtain high-speed images and videos, which severely limits the scope of application of single-pixel imaging

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  • Active imaging method and system based on compressed sampling
  • Active imaging method and system based on compressed sampling
  • Active imaging method and system based on compressed sampling

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Experimental program
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Effect test

Embodiment 1

[0096] According to one embodiment of the present invention, the active imaging process is as follows.

[0097] Figure 1a and Figure 1b It is the imaging system architecture diagram of Embodiment 1, refer to Fig. 1, firstly, perform spectral modulation on the pulsed optical signal generated by the pulsed optical signal generating device, so that the optical signal is modulated with a compressed sampling measurement matrix sequence in the time domain.

[0098] In the embodiment of the present invention, a pulsed optical signal generator is used as the light source of the imaging system, and different pulsed signal generators generate optical signals with different spectral widths B. The pulsed light signal generating device 101 generates a pulsed light signal in a working state, and the pulsed light signal can be expressed as f(ω) in the frequency domain, where ω is the angular frequency of light. The pulsed optical signal f(ω) output by the pulsed optical signal generating ...

Embodiment 2

[0149] According to yet another embodiment of the present invention, the active imaging process based on compressed sampling is as follows.

[0150] Figure 2a and Figure 2b It is the structure diagram of the imaging system of the second embodiment, referring to Fig. 2, firstly, the pulse light signal is input to the optical imaging device for imaging processing;

[0151] In the embodiment of the present invention, a pulsed light signal generator is used as the light source of the imaging system, and different pulsed signal generators generate light signals with different spectral widths B. The pulsed light signal generating device 201 generates a pulsed light signal in a working state, and the pulsed light signal can be expressed as f(ω) in the frequency domain, where ω is the angular frequency of light. The pulsed optical signal f(ω) is input into the optical imaging system 205 for imaging. The optical imaging system generally includes a scattering grating 2051 and a lens...

Embodiment 3

[0178] According to yet another embodiment of the present invention, the active imaging process based on compressed sampling is as follows.

[0179] Figure 3a and Figure 3b It is the imaging system architecture diagram of the third embodiment, referring to Fig. 3, the optical signal generator in the present embodiment adopts a pulseless light source, for example, an incoherent light source, and the phase between each spectral line of the incoherent light source has nothing to do, so it can Effectively, the amplitude of the optical signal is modulated on the light source. Optionally, a broadband incoherent light source may be used, and the broadband incoherent light source includes a multi-wavelength laser, a multi-wavelength laser array, a broadband noise light source, and the like.

[0180] performing the first spectral modulation on the optical signal generated by the optical signal generator 301;

[0181] First, the optical signal generator 301 generates an optical sig...

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Abstract

The invention relates to the field of initiative imaging, and provides an initiative imaging system based on compressed sampling. The initiative imaging system comprises a pulsed light signal generating device used for generating pulsed light signals, a light imaging device used for imaging the pulsed light signals generated by the pulsed light signal generating device, a light collecting device used for collecting reflected light formed by a pulsed light signal irradiation target scene processed by the light imaging device, a first light modulator used for carrying out first spectrum modulation on the reflected light collected by the light collecting device, and an image reconstructing device used for carrying out image reconstruction on the pulsed light signals modulated by the first light modulator. According to the initiative imaging system, a digital micromirror array and other mechanical structures in a traditional single-pixel imaging system are removed, and the imaging speed is greatly increased.

Description

technical field [0001] The present invention relates to the field of active imaging, in particular to an active imaging method and device based on compressed sampling. Background technique [0002] In the imaging system, according to whether there is an illumination source, it is divided into two imaging methods: active imaging and passive imaging. The biggest feature of passive imaging is that it does not have a light source. It relies on the target or the environment to reflect natural light such as the sun or the target's own radiation, and uses imaging equipment to detect these weak signals and finally image them. Active imaging refers to the use of artificial lighting, the use of an artificial optical radiation source to illuminate the target, and the use of receivers to collect and detect part of the radiation directly or reflected by the target scene and finally image it. Due to the advantages of high intensity, high collimation, good monochromaticity, and easy synch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/89
CPCG01S17/89
Inventor 陈宏伟
Owner TSINGHUA UNIV
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