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Multispectral imaging device and multispectral imaging method based on compressed sensing

A multi-spectral imaging and compressed sensing technology, applied in the field of spectral imaging to achieve the effect of short measurement time

Active Publication Date: 2013-02-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There is no literature report on the application of compressive sensing theory to the field of multispectral imaging modulated by spectral dimension encoding

Method used

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  • Multispectral imaging device and multispectral imaging method based on compressed sensing
  • Multispectral imaging device and multispectral imaging method based on compressed sensing
  • Multispectral imaging device and multispectral imaging method based on compressed sensing

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Embodiment 1

[0053] Such as image 3 Shown is a compressive sensing-based multispectral imaging system in which both spatial light modulators use reflective spatial light modulators. Here, the reflective spatial light modulator may be a reflective liquid crystal on silicon device (LCOS) or a reflective digital micromirror device (DMD). image 3 The reflective DMD is taken as an example, including target scene 1, imaging objective lens 2, DMD spatial modulator 301, collimation system 4, dispersion element 5, converging lens 6, DMD spatial modulator 302, converging lens 7, single point detector 8. Data storage and calculation module 9. Image generation and loading module 10. The collimation system includes: a lens 401 and a lens 403 whose optical axis and focal point coincide with each other; a pinhole filter 402 that is arranged between the lens 401 and the lens 403 and whose central axis is parallel to or coincides with the optical axis; between the lens 401 and the lens 403 The distance...

Embodiment 2

[0072] Such as Figure 4 As shown, the first spatial light modulator uses a transmissive spatial light modulator, and the second spatial light modulator uses a reflective spatial light modulator. A multispectral imaging system based on compressed sensing, Figure 4 Take the transmissive liquid crystal device and the reflective DMD as examples, including target scene 1, imaging objective lens 2, transmissive liquid crystal device 303, collimation system 4, dispersion element 5, converging lens 6, DMD spatial modulator 304, converging lens 7 , a single-point detector 8, a data storage and calculation module 9, and an image generation and loading module 10.

[0073] In this system, the first spatial light modulator adopts a transmissive liquid crystal device 303, the second spatial light modulator adopts a DMD spatial modulator 304, the imaging objective lens 2 collects the diffuse reflection light of the target scene 1, and the transmissive liquid crystal device 303 is located a...

Embodiment 3

[0075] Such as Figure 5 As shown, it is a multispectral imaging system based on compressive sensing in which both spatial light modulators use a transmissive spatial light modulator. Figure 5 Take the transmissive liquid crystal device as an example, including target scene 1, imaging objective lens 2, transmissive liquid crystal device 305, collimation system 4, dispersion element 5, converging lens 6, transmissive liquid crystal device 306, converging lens 7, single-point detection device 8, data storage and calculation module 9, and image generation and loading module 10.

[0076] In this system, two transmissive liquid crystal devices are used as spatial light modulators, the imaging objective lens 2 collects the diffuse reflection light of the target scene 1, and the transmissive liquid crystal device 305 is located on the image plane of the imaging objective lens, so the image of the target scene will be formed in the transmitted type liquid crystal device 305. A two-...

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Abstract

The invention discloses a multispectral imaging device based on compressed sensing. The multispectral imaging device comprises an imaging objective lens, a first spatial light modulator, a collimation system, a dispersion element, a first convergent lens, a second spatial light modulator, a second convergent lens, a single point detector, a data storage computation module and an image generating loading module. A to-be-tested object is imaged on the first spatial light modulator by the imaging lens, texture and spectral codes of the obtained images are modulated by the spatial light modulators, total light intensity of the modulated images is detected by the single point detector, and scenery multispectral images are obtained by computing according to compressed sensing algorithm and texture and spectral information of multi-coded images. Spectrum scanning is not needed, the single point detector is used to and diffraction limit is broken through, measuring time of an imaging process is short and is further shortened by the aid of the compressed sensing algorithm, and accordingly scenery multispectral images can be acquired quickly.

Description

technical field [0001] The invention belongs to the technical field of spectral imaging, and in particular relates to a multi-spectral imaging device and method that uses two spatial light modulators to encode and modulate image texture and spectrum based on compressed sensing. Background technique [0002] Multispectral imaging technology combines imaging technology with spectral technology, and is a technology based on multiple narrow bands, which has important applications in remote sensing and detection. The multispectral image data of the target needs to be scanned horizontally and vertically. [0003] Conventional multispectral imaging techniques can be divided into two types in principle: dispersion type and interference type. Among them, the dispersive spectroscopic system uses the property that the refractive index of the medium changes with the wavelength, and uses a prism or a grating as a spectroscopic element. The components include imaging lens, dispersion sy...

Claims

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Application Information

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IPC IPC(8): G01J3/28
Inventor 刘旭李东刘向东张硕王金成李海峰
Owner ZHEJIANG UNIV
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