CN115752726A - DMD-based variable-field-of-view wide-spectrum associated imaging system - Google Patents
DMD-based variable-field-of-view wide-spectrum associated imaging system Download PDFInfo
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Abstract
The invention relates to a variable-field-of-view wide-spectrum correlation imaging system based on a DMD (digital micromirror device), in particular to the technical field of imaging. The computer in the system is used for generating N modulation matrix patterns according to the set modulation matrix size, the target object is arranged on an output light path of the broad spectrum laser to reflect laser, and the DMD is arranged on a light path of a reflected light beam of the target object to modulate the laser reflected by the target object according to the N modulation matrix patterns to obtain N modulation signals; the focusing lens module is arranged on a reflection light path of the DMD and used for focusing the modulation signal to form a focusing light beam, the spectrometer module is arranged on a transmission light path of the focusing lens module and used for obtaining light intensity information of a plurality of spectral wave bands according to the focusing light beam, and the computer is used for obtaining a wide spectrum image of the target object according to the light intensity information of each spectral wave band and the modulation matrix pattern. The invention can reduce the system cost and improve the imaging quality.
Description
Technical Field
The invention relates to the technical field of imaging, in particular to a variable-field-of-view wide-spectrum correlation imaging system based on a DMD (digital micromirror device).
Background
The size of the imaging field range is taken as a key parameter of the imaging technology, and is increasingly paid more attention in the development process of the imaging technology, and besides the field of view is increased, researchers also carry out a series of researches on the variable field of view.
The variable field of view research in the existing related imaging technology is less, and the main variable field of view research is used in the traditional imaging, the variable field of view needs to use an adjustable optical device, usually through the displacement of a part of lenses, or a multi-lens system is adopted, but the displacement of the lenses can introduce mechanical components, the error is increased, and the multi-lens imaging system can increase the system cost.
The wide-spectrum associated imaging in the existing wide-spectrum associated imaging technology utilizes different spectral band information of visible light and near infrared of a target to acquire the physical attribute of the target, the detection capability of the traditional imaging system is expanded, and the wide-spectrum associated imaging has extremely important application value in the fields of remote sensing detection, environmental monitoring, national defense safety and the like.
In summary, the existing variable field imaging and spectrum correlation imaging technologies have high device cost and low imaging quality.
Disclosure of Invention
The invention aims to provide a DMD-based variable-field-of-view broad-spectrum correlated imaging system, which can reduce the system cost and improve the imaging quality.
In order to achieve the purpose, the invention provides the following scheme:
a DMD-based variable field-of-view broad-spectrum correlated imaging system, comprising:
the wide-spectrum laser device comprises a computer, a wide-spectrum laser device, a beam expanding lens module, an imaging lens module, a DMD, a focusing lens module and a spectrometer module, wherein the computer is respectively connected with the wide-spectrum laser device, the DMD and the spectrometer module, the computer is used for controlling the wide-spectrum laser device to emit laser, the computer is used for generating N modulation matrix patterns according to set modulation matrix sizes and relative positions of the modulation matrix patterns and transmitting the N modulation matrix patterns to the DMD, the beam expanding lens module is arranged on an output light path of the wide-spectrum laser device, the beam expanding lens module is used for expanding the laser to form a laser beam, a target object is arranged on the output light path of the beam expanding lens module, the target object is used for reflecting the laser beam to form a reflected light beam, the imaging lens module is arranged on the light path of the reflected light beam, the imaging lens module is used for imaging the laser beam, the DMD is arranged on the output light path of the imaging lens module, and the DMD is used for modulating the imaging laser beam according to obtain N modulation signals; the focusing lens module is arranged on a reflection light path of the DMD, the focusing lens module is used for focusing N modulation signals to form N focusing light beams, the spectrometer module is arranged on a transmission light path of the focusing lens module, the spectrometer module is used for obtaining N light intensity information sets according to the N focusing light beams, one light intensity information set comprises light intensity information of a plurality of spectrum wave bands corresponding to the same focusing light beam, the computer is used for obtaining a wide spectrum image of the target object according to the light intensity information of each spectrum wave band and the N modulation matrix patterns, and N is an integer greater than 1.
Optionally, the focusing lens module includes: a first focusing lens and a second focusing lens; the first focusing lens is arranged on a light path of a left reflected light beam of the DMD, and the second focusing lens is arranged on a light path of a right reflected light beam of the DMD.
Optionally, the spectrometer module comprises: a visible light spectrometer and a near infrared spectrometer; the visible light spectrometer is arranged on a transmission light path of the first focusing lens, and the near-infrared spectrometer is arranged on a transmission light path of the second focusing lens.
Optionally, the beam expanding lens module is an emission lens.
Optionally, the imaging lens module is a target lens.
Optionally, the working range of the broad spectrum laser is 450nm to 1700 nm.
Optionally, the modulation matrix pattern is a hadamard matrix pattern.
Optionally, the DMD-based variable field-of-view broad spectrum correlated imaging system further includes: and the focusing lens module is connected with the spectrometer module through the optical fiber.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention adopts a spectrum correlation imaging method, utilizes the space light coding modulation function of the DMD, obtains different modulation matrix patterns by setting the corresponding modulation matrix size and the relative position of the modulation matrix patterns, realizes variable view field wide spectrum correlation imaging under a fixed lens, obtains wide spectrum images of different view fields by the same system, realizes efficient visible light and near infrared band spectrum imaging, improves the imaging precision, realizes wide spectrum imaging with adjustable view field and resolution by only one system, and greatly reduces the cost of an imaging system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a DMD-based variable field-of-view wide-spectrum correlation imaging system according to an embodiment of the present invention;
fig. 2 is a flowchart of the operation of the DMD based variable field-of-view broad spectrum correlated imaging system according to the embodiment of the present invention.
Description of the symbols:
1-computer, 2-broad spectrum laser, 3-emission lens, 4-DMD, 5-target lens, 6.1-first focusing lens, 6.2-second focusing lens, 7.1-visible light spectrometer, 7.2-near infrared spectrometer, 8-target object.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
An embodiment of the present invention provides a variable field-of-view wide-spectrum correlated imaging system based on a DMD (digital Micromirror device), as shown in fig. 1, including:
the device comprises a computer 1, a wide-spectrum laser 2, a beam expanding lens module, an imaging lens module, a DMD4, a focusing lens module and a spectrometer module, wherein the computer 1 is respectively connected with the wide-spectrum laser 2, the DMD4 and the spectrometer module, the computer 1 is used for controlling the wide-spectrum laser 2 to emit laser, the emitted laser is wide-spectrum laser, the computer 1 is used for generating N modulation matrix patterns according to set modulation matrix sizes and relative positions of the modulation matrix patterns and transmitting the N modulation matrix patterns to the DMD4, the beam expanding lens module is arranged on an output light path of the wide-spectrum laser 2, the beam expanding lens module is used for expanding the laser to form laser beams, a target object 8 is arranged on the output light path of the beam expanding lens module, the target object 8 is used for reflecting the laser beams to form reflected beams, the imaging lens module is arranged on a light path of reflected light beams of the target object 8, the imaging lens module is used for imaging the laser beams to obtain imaging beams, the DMD4 is arranged on the output light path of the imaging lens module, and the imaging lens module 4 is used for modulating the reflected light beams according to the N modulation matrix patterns to obtain imaging light beams; the focusing lens module is arranged on a reflection light path of the DMD4, the focusing lens module is used for focusing N modulation signals to form N focusing light beams, the spectrometer module is arranged on a transmission light path of the focusing lens module, the spectrometer module is used for obtaining N light intensity information sets according to the N focusing light beams, one light intensity information set comprises light intensity information of a plurality of spectrum bands corresponding to the same focusing light beam, specifically, the light intensity information of the focusing light beam is received, the light intensity and spectrum band information of the focusing light beam are detected, the computer 1 is used for obtaining a broad spectrum image of the target object 8 according to the light intensity information of each spectrum band and the N modulation matrix patterns, specifically, the light intensity information of each spectrum band is received, the light intensity information of each spectrum band is correlated with the modulation matrix patterns, the broad spectrum image of the target object 8 is recovered, and N is an integer larger than 1.
As an alternative embodiment, the focusing lens module includes: a first focusing lens 6.1 and a second focusing lens 6.2; the first focusing lens 6.1 is disposed on the optical path of the left reflected light beam of the DMD4, and the second focusing lens 6.2 is disposed on the optical path of the right reflected light beam of the DMD 4.
As an alternative embodiment, the spectrometer module comprises: a visible light spectrometer 7.1 and a near infrared spectrometer 7.2; the visible light spectrometer 7.1 is arranged on a transmission light path of the first focusing lens 6.1, the near infrared spectrometer 7.2 is arranged on a transmission light path of the second focusing lens 6.2, and the modulation signals are reflected to the left and the right to be reflected to the first focusing lens 6.1 and the second focusing lens 6.2 respectively.
As an optional implementation, the beam expanding lens module is an emission lens 3.
As an optional implementation manner, the imaging lens module is a target lens 5, the target lens 5 is configured to focus and collect a reflected signal reflected by a target object 8 to obtain a target signal, i.e., an imaging light beam, and the DMD4 modulates the target signal into a modulation signal.
As an alternative embodiment, the working range of the broad spectrum laser 2 is 450nm to 1700 nm.
As an optional implementation, the modulation matrix pattern is a hadamard matrix pattern.
As an alternative embodiment, the DMD based variable field of view broadband spectral correlation imaging system further comprises: and the focusing lens module is connected with the spectrometer module through the optical fiber and is used for transmitting the focusing light beam.
As an alternative embodiment, the working range of the DMD-based variable field-of-view broad spectrum correlated imaging system is 450nm to 1700 nm.
As shown in fig. 2, the working process of the above system of the present invention is:
the computer controls the broad spectrum laser to emit broad spectrum laser, and the broad spectrum laser irradiates the target object through the emission lens.
Setting the size of a modulation matrix in a modulation matrix pattern and the relative position of the modulation matrix pattern according to the imaging view field requirement (the imaging view field and the resolution requirement), generating a corresponding modulation matrix pattern by a computer, recording N modulation matrix patterns, and loading the modulation matrix pattern to the DMD through a data line.
The DMD acquires a reflection signal of a target object through the target lens, modulates the reflection signal for N times, reflects the reflection signal to two sides to form N modulation signals respectively, and focuses the modulation signals through the focusing lens to obtain a focused light beam.
The spectrometer collects the focused light beams to obtain light intensity information of a plurality of spectral bands.
And performing correlation calculation on the light intensity information of the plurality of spectral bands and the N modulation matrix patterns by using a computer to obtain a wide-spectrum spectral image of the target object.
Example (c): and setting the size of a modulation matrix in the modulation matrix pattern and the relative position of the modulation matrix pattern according to the imaging field demand, generating a corresponding modulation matrix pattern by using a computer, and recording N modulation matrix patterns. Taking the number of pixels of the imaged image as 64 × 64 as an example, when the imaging field of view is required at a specific smaller position and the resolution is high, a modulation matrix pattern for specifying the imaging position can be generated, wherein the size of the modulation matrix is the size corresponding to 64 × 64 micromirror arrays on the DMD, and the resolution is the maximum resolution of the DMD. When the imaging field of view requirement is large, a modulation matrix pattern of a designated imaging position can be generated, wherein the size of the modulation matrix is the size of a 512 × 512 micro mirror array on the corresponding DMD, and the resolution is one eighth of the maximum resolution of the DMD.
The advantages are that: the variable visual field can meet the requirements of different visual fields and different resolutions through one optical system, saves space and load, and greatly reduces system cost.
The principle is as follows: the DMD has a space optical coding modulation function, can load different modulation matrix patterns, and conveniently and quickly realizes the change of the field of view and the resolution of an imaging system by adjusting the relative position and the size of the modulation matrix of the loaded pattern and utilizing an associated imaging principle.
The technical problem solved by the invention is as follows:
by adopting a spectrum correlation imaging method, the target object is subjected to low-cost and high-precision visible light spectrum imaging and near infrared spectrum imaging by matching with a high-precision visible light spectrometer and a near infrared spectrometer for detection.
By utilizing the space light coding modulation function of the DMD, different modulation matrix patterns are obtained by overturning the micromirror array by setting the corresponding modulation matrix size and the relative position of the modulation matrix patterns, variable view field wide spectrum correlation imaging under a fixed lens is realized, wide spectrum images of different view fields are obtained by the same system, efficient visible light and near infrared band spectrum imaging is realized, wide spectrum imaging with adjustable view field and resolution is realized by only one system, and the cost of an imaging system is greatly reduced.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the embodiment of the present invention are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A DMD-based variable field-of-view broad-spectrum correlated imaging system, comprising:
the wide-spectrum laser device comprises a computer, a wide-spectrum laser device, a beam expanding lens module, an imaging lens module, a DMD, a focusing lens module and a spectrometer module, wherein the computer is respectively connected with the wide-spectrum laser device, the DMD and the spectrometer module, the computer is used for controlling the wide-spectrum laser device to emit laser, the computer is used for generating N modulation matrix patterns according to set modulation matrix sizes and relative positions of the modulation matrix patterns and transmitting the N modulation matrix patterns to the DMD, the beam expanding lens module is arranged on an output light path of the wide-spectrum laser device, the beam expanding lens module is used for expanding the laser to form a laser beam, a target object is arranged on the output light path of the beam expanding lens module, the target object is used for reflecting the laser beam to form a reflected light beam, the imaging lens module is arranged on the light path of the reflected light beam, the imaging lens module is used for imaging the laser beam, the DMD is arranged on the output light path of the imaging lens module, and the DMD is used for modulating the imaging laser beam according to obtain N modulation signals; the focusing lens module is arranged on a reflection light path of the DMD, the focusing lens module is used for focusing N modulation signals to form N focusing light beams, the spectrometer module is arranged on a transmission light path of the focusing lens module, the spectrometer module is used for obtaining N light intensity information sets according to the N focusing light beams, one light intensity information set comprises light intensity information of a plurality of spectrum wave bands corresponding to the same focusing light beam, the computer is used for obtaining a wide spectrum image of the target object according to the light intensity information of each spectrum wave band and the N modulation matrix patterns, and N is an integer greater than 1.
2. The DMD-based variable-field-of-view broad-spectrum coherent imaging method according to claim 1, wherein the focusing lens module comprises: a first focusing lens and a second focusing lens; the first focusing lens is arranged on a light path of a left reflected light beam of the DMD, and the second focusing lens is arranged on a light path of a right reflected light beam of the DMD.
3. A DMD based variable field-of-view broad spectral correlation imaging system as claimed in claim 2, wherein the spectrometer module comprises: a visible light spectrometer and a near infrared spectrometer; the visible light spectrometer is arranged on a transmission light path of the first focusing lens, and the near-infrared spectrometer is arranged on a transmission light path of the second focusing lens.
4. The DMD based variable field of view broad spectrum correlated imaging system of claim 1, wherein said beam expanding lens module is an emission lens.
5. The DMD-based variable field-of-view broad-spectrum correlated imaging system of claim 1, wherein said imaging lens module is a target lens.
6. The DMD based variable field-of-view broad spectrum coherent imaging system of claim 1, wherein the broad spectrum laser has an operating range of 450nm to 1700 nm.
7. The DMD based variable field of view broad spectral correlation imaging system of claim 1, wherein the modulation matrix pattern is a hadamard matrix pattern.
8. The DMD based variable field-of-view broad spectral correlation imaging system of claim 1, further comprising: and the focusing lens module is connected with the spectrometer module through the optical fiber.
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| CN116124752A (en) * | 2023-04-04 | 2023-05-16 | 之江实验室 | Tissue bionic die body based on multispectral regulation and control and generation method thereof |
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| CN116124752A (en) * | 2023-04-04 | 2023-05-16 | 之江实验室 | Tissue bionic die body based on multispectral regulation and control and generation method thereof |
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