A hyperspectral stealth method and device

Abstract

The application discloses a hyperspectral stealth method and equipment, and belongs to the technical field of optical stealth. The hyperspectral stealth equipment comprises a full-spectrum LED light source, a collimating mirror, a fast mirror, a grating, a digital micromirror, a synchronous trigger, a projection lens, a standard projection plane, a hyperspectral imager and a data solving computer. The light source output by the grating is changed in the exit angle by swinging the fast mirror, and the light source output by the grating swings on the digital micromirror at the rear end of the light source, so that the hyperspectral projection is realized. The hyperspectral projector assembly is used for generating a dynamic hyperspectral projection image; the standard projection plane is used for receiving the hyperspectral projection image and scattering the projected light, so that the projection stealth effect is realized. The hyperspectral imager and the hyperspectral projection assembly are used for realizing the receiving and modulation of the hyperspectral image, and the spectral stealth is realized. The characteristic spectral band is selected by using a compression characteristic spectral algorithm, the data volume is compressed, and the real-time change of the stealth image is realized.

Description

Technical Field

[0001] This invention relates to a hyperspectral stealth method and device, belonging to the field of optical stealth technology. Background Technology

[0002] Achieving optical cloaking has always been an important research direction in optics, materials science, and other fields. One method of optical cloaking is to use external light sources to alter the spectral characteristics of an object, such as using flexible luminescent materials or illuminating the object to change its color properties. This method can effectively mask the color characteristics of the object's surface. Currently, methods that use external light sources to mask the spectral characteristics of an object are still limited to chromaticity and light intensity modulation. Even if the cloaked object can acquire the same color or shape as the background or target, the spectral information of the cloaked object is not the same as the spectral information of the actual background, making it easily detectable by hyperspectral imaging equipment. In particular, in the field of optical cloaking through light source projection, the limitations of traditional RGB three-color or RGBW four-color projection technologies prevent the spectral information of the cloaked object from matching the spectral information of the actual background. Only "pseudo-color" can be achieved, mimicking color information, but not spectral-level cloaking. Furthermore, cloaking methods that alter material properties to match the spectral information of the cloaked object to the actual background cannot quickly and in real-time change the spectral information of the cloaked object, thus making them unusable in dynamic scenes. Furthermore, hyperspectral image data is many times larger than ordinary color images, and its real-time processing requires very complex computational methods.

[0003] Therefore, the hyperspectral stealth method and device involved in this invention can break through the stealth spectral band limitation in traditional optical stealth technology, and compared with material optical stealth methods, it can quickly modify the target spectral characteristics in real time through hyperspectral calculation methods to achieve hyperspectral stealth effect. Summary of the Invention

[0004] To address the challenges of spectral stealth and real-time changes in the current fields of optical and material stealth, the present invention aims to provide a hyperspectral stealth method and device. This method utilizes a hyperspectral imager and a hyperspectral projection component to receive and modulate hyperspectral images, thereby achieving spectral stealth. Furthermore, it employs a compressed feature spectrum algorithm to select characteristic spectral bands, compressing the data volume and enabling real-time changes in the stealth image.

[0005] The objective of this invention is achieved through the following technical solution.

[0006] The present invention discloses a hyperspectral projection stealth method, comprising the following steps:

[0007] Step S1: Obtain the prior hyperspectral cloaking image data cube to be implemented;

[0008] Step S2: Use a hyperspectral imager to acquire the current hyperspectral image data cube of the standard projected surface;

[0009] Step S3: Solve the data cube of step S1 into a compressed target cube A using equation (1) to achieve a compressed hyperspectral image of the stealth scene; compress the current cube B using equation (1) to solve the data cube of step S2; the spectral compression algorithm for the scene is shown in equation (1):

[0010]

[0011] Where M is the band number; n is the extracted band number; j is the other band number of the image data cube, j = 1 to M; O n O j For the extracted bands and other band data values ​​of the target area; N n N j The extracted band and other band data values ​​are used to represent the surrounding area of ​​the target region.

[0012] Step S4: Compare the compressed target cube A and the compressed current cube B, and use the comparison result as a projection image, which is output by the hyperspectral projector;

[0013] Step S5: Repeat steps S2 and S3 to compare the compressed target cube A and the compressed current cube B, and iterate the comparison result to the projected image;

[0014] Step S6: Repeat step S5 to make the hyperspectral projector continuously output the required hyperspectral cloaking image, thus achieving hyperspectral projection cloaking.

[0015] A hyperspectral stealth device is used to implement the aforementioned hyperspectral projection stealth method. The hyperspectral stealth device includes a full-spectrum LED light source, a collimating mirror, a fast-reflecting mirror, a grating, a digital micromirror, a synchronization trigger, a projection lens, a standard projection surface, a hyperspectral imager, and a data processing computer.

[0016] The beam splitter output by the grating changes its emission angle by swinging the fast-reflecting mirror, causing the beam splitter output by the grating to swing on the digital micromirror at the rear end of the beam splitter, thereby achieving hyperspectral projection.

[0017] A hyperspectral projection assembly is formed by a full-spectrum LED light source, a collimating lens, a fast-reflecting mirror, a grating, a digital micromirror, a synchronous trigger, and a projection lens.

[0018] The hyperspectral projector assembly is used to generate dynamic hyperspectral projected images;

[0019] The standard projection surface is used to receive hyperspectral projection images and scatter the projected light to achieve a projection stealth effect.

[0020] The hyperspectral imager is used to capture the actual scattered light from the standard projected surface by imaging the hyperspectral projection area within the imaging region.

[0021] The data processing computer is used to receive images from the hyperspectral imager and to perform real-time adaptive control on the output signal of the hyperspectral projector to ensure the stealth effect.

[0022] The full-spectrum LED light source generates continuous spectrum light;

[0023] The collimating lens is placed perpendicular to the optical axis to vertically converge the continuous spectrum light.

[0024] The fast-reflecting mirror is placed on the optical path axis of the collimating mirror and located at the focal length of the collimating mirror. It reflects the converged projection light source onto the grating and can be quickly swung so that the light source can be reflected to different positions of the grating.

[0025] The grating is used to uniformly disperse the full spectrum of light from the projection light source to generate a spectroscopic spectrum.

[0026] The digital micromirror is used to receive the spectroscopic spectrum emitted by the spectrometer, and to modulate the light intensity of the spectroscopic spectrum in each time segment based on the opening and closing of the digital micromirror, so as to obtain continuous spectrum light in a time domain.

[0027] The synchronous trigger is used to control the fast-reflecting mirror and the digital micromirror to operate at corresponding frequencies;

[0028] The projection lens is used to project the continuous spectrum light received by the digital micromirror onto the standard stolen surface;

[0029] The standard projection surface is used to fully scatter the projected light emitted from the projection lens;

[0030] The hyperspectral imager can be used to perform hyperspectral imaging of visible light scattered by the standard projected surface.

[0031] The data processing computer can acquire the output image of the hyperspectral imager and output the processing results to the synchronous trigger and the digital micromirror to control their operation.

[0032] Preferably, the full-spectrum LED light source emits light covering the entire visible light spectrum;

[0033] Preferably, the collimating lens can focus the light emitted from the full-spectrum LED light source into a strip shape;

[0034] Preferably, through optical path design, after the light source is reflected by a fast-reflecting mirror, the strip-shaped light spot converges on the grating;

[0035] Preferably, the projection light sources after being processed by the beam splitter are arranged in a two-dimensional space. The horizontal arrangement corresponds to each photon spectral band, and the vertical arrangement corresponds to the same linear extension of the light sources of the same spectral band and the input projection light source with a strip-shaped cross section.

[0036] Preferably, through optical path design, each uniform spectral segment separated by the beam splitter can uniformly cover any pixel of the DMD array within a set period.

[0037] Preferably, through optical path design, when the digital micromirror receives the spectral light source output by the grating, each column of pixels corresponds to a sub-spectral band, and each row of pixels receives light from different spectral bands at the same time. When the digital micromirror performs projection, each micromirror corresponds to a projection pixel.

[0038] Preferably, the digital micromirror is configured to perform pixel-gating of a two-dimensionally arranged multi-spectral light source as needed to achieve spectral time modulation;

[0039] Preferably, through optical path design, the hyperspectral imager can cover the projection area projected onto the standard projection surface.

[0040] The present invention discloses a method for operating a hyperspectral stealth device, comprising the following steps:

[0041] Step 1: Input the desired target spectrum into the data processing computer;

[0042] Step 2: Use a hyperspectral imager to capture the current hyperspectral image of the standard projected surface and input it into the data processing computer;

[0043] Step 3: Data Processing. After receiving the hyperspectral images of the target scene and the current scene, the computer processes the data and outputs the projected image to the hyperspectral projection component.

[0044] Step 4: After receiving the projected image, the hyperspectral projection component projects the image onto the standard projection surface, thereby changing the spectrum of the standard projection surface.

[0045] Step 5: Repeat steps 2 to 4 to make the spectrum of the standard projected surface the same as the target spectrum to achieve the stealth effect.

[0046] Beneficial effects:

[0047] 1. The present invention discloses a hyperspectral stealth method and device, which realizes optical stealth ray links by designing and integrating the optical path, and realizes data compression of the projected spectrum by solving the hyperspectral data cube. The present invention can achieve real-time dynamic spectral stealth effect in the stealth area, and can realize the stealth of hyperspectral projectors in the 380nm-840nm visible light band.

[0048] 2. This invention discloses a hyperspectral stealth method and device, which achieves high-speed spectral decomposition and spectral spatial modulation through a combination of a fast-reflecting mirror and a grating, and controlled by a synchronous trigger and a digital micromirror, thereby realizing the projection function of continuous-frame hyperspectral stealth images. Based on the hyperspectral stealth image projection function, hyperspectral stealth functionality is further realized for standard projected surfaces.

[0049] 3. The hyperspectral stealth method and device disclosed in this invention can be assembled into a prototype using off-the-shelf products, including a full-spectrum LED light source, collimating lens, fast-reflecting mirror, grating, digital micromirror, synchronous trigger, projection lens, standard projection surface, hyperspectral imager, and data processing computer. The structure is simple and the cost is low.

[0050] 4. The present invention discloses a hyperspectral stealth method and device, which achieves hyperspectral projection stealth by using a full-spectrum light source to perform beam sweeping and modulation. Compared with traditional projection stealth methods, it broadens and improves the spectral resolution. The spectral resolution of the projected hyperspectral image can reach up to 5nm, and the number of modulated channels can reach more than 200, which far exceeds the current external light source optical stealth devices. Attached Figure Description

[0051] Figure 1 A schematic diagram of the hyperspectral stealth device provided by the present invention;

[0052] Among them, 1—full-spectrum LED light source, 2—collimating lens, 3—fast-reflecting mirror, 4—grating, 5—digital micromirror, 6—synchronous trigger, 7—projection lens, 8—standard projection surface, 9—hyperspectral imager, 10—data processing computer. Detailed Implementation

[0053] This invention achieves optical stealth ray links by designing and integrating optical paths, and compresses the projected spectrum data by solving the hyperspectral data cube, thereby realizing a real-time dynamic spectral stealth effect.

[0054] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0055] like Figure 1 As shown, the hyperspectral stealth device disclosed in this embodiment mainly consists of a full-spectrum LED light source 1, a collimating lens 2, a fast-reflecting mirror 3, a grating 4, a digital micromirror 5, a synchronous trigger 6, a projection lens 7, a standard projection surface 8, a hyperspectral imager 9, and a data processing computer 10.

[0056] The full-spectrum LED light source 1 generates continuous spectrum light.

[0057] The collimating lens 2 is an aspherical cylindrical lens group, placed perpendicular to the optical axis, which straightens the continuous spectrum light after it is converged in the vertical direction to obtain a projection light source with a strip-shaped cross section.

[0058] The fast reflector 3 is connected to the synchronous trigger 6 and receives a trigger signal from the synchronous trigger 6. Its vertical axis is perpendicular to the optical axis and it is placed at a certain angle to fold the optical path.

[0059] The grating 4 is perpendicular to the optical axis and is placed at a certain angle to split the light emitted from the light source in the horizontal direction.

[0060] The digital micromirror 5 is connected to the synchronization trigger 6 and the data processing computer 10. It outputs a synchronization trigger signal to the synchronization trigger 6, receives a modulated image to the data processing computer 10, and is placed on the optical axis of the light emitted from the grating 4. It is used to receive the spectroscopic spectrum emitted by the grating 4 and modulates the light intensity of the spectroscopic spectrum of each subframe based on the opening and closing of the digital micromirror 5.

[0061] The synchronization trigger 6 is connected to the fast reflector 3 and the digital micromirror 5. It receives the synchronization trigger signal from the digital micromirror, performs calculations, and outputs the synchronization trigger signal to the fast reflector 3.

[0062] The projection lens 7 is placed in front of the digital micromirror 5 on the optical axis, and its focal plane coincides with that of the digital micromirror 5, for projecting the continuous spectrum light onto the standard projection surface 8.

[0063] The standard projection surface 8 is placed on the optical axis and located on the real image projected by the digital micromirror 5 on the projection lens 7, thus scattering the projected spectrum.

[0064] The hyperspectral imager 9 is placed in front of the standard projection surface 8, and its scene matches the real image projected by the projection lens 7, enabling real-time imaging of the hyperspectral scattering state on the standard projection surface 8.

[0065] The data processing computer 10 has the function of acquiring the image of the hyperspectral imager 9, processing the subsequent output image, and transmitting the output image to the digital micromirror 5 in real time.

[0066] The collimating lens 2 is an aspherical cylindrical lens group, placed perpendicular to the optical axis. The distance from the full-spectrum LED light source 1 is the theoretical front focal length of the collimating lens 2, and the optical path from the grating 4 is the theoretical back focal length of the collimating lens 2. The fast-reflecting mirror has a deflection angle of 12° and a swing angle of ±0.8°. The grating 4 forms a 21° angle with the optical axis, and the grating emission angle is 16.7°. The digital micromirror 5 forms a 12° angle with the projection lens 7.

[0067] Furthermore, the full-spectrum LED light source 1, the collimating lens 2, the fast-reflecting mirror 3, the grating 4, the digital micromirror 5, and the projection lens 7 are all on the same optical axis, where the optical path folding is intended to make the system as compact as possible. The full-spectrum LED light source 1 is located 10mm in front of the collimating lens 2, the fast-reflecting mirror 3 is located 28mm in front of the collimating lens 2, the grating 4 is located 22mm behind the optical path of the fast-reflecting mirror 3, the optical path from the grating 4 to the fast-reflecting mirror 3 is 50mm from the back focal length of the collimating lens 2, the distance between the digital micromirror 5 and the grating is 40mm, this distance is based on the standard that the divergence angle of the grating can cover the digital micromirror 5, and the projection lens 7 is located 28mm from the point where the optical axis of the digital micromirror is deflected by 12°, which is the theoretical back focal length of the projection lens.

[0068] Furthermore, the full-spectrum LED light source 1 generates continuous spectrum light in the range of 380nm-840nm. Since the light generated by the full-spectrum LED light source 1 has a divergence angle, it is necessary to collimate and straighten the light generated by the full-spectrum LED light source 1 before it can be used in the system. Therefore, a collimating lens is required.

[0069] The collimating lens 2 is an aspherical cylindrical lens group, which is placed sequentially along the optical path perpendicular to the optical axis, and can collimate the full-spectrum light source to a certain extent in the vertical direction.

[0070] The fast-reflecting mirror 3, controlled by the synchronous trigger 6, can achieve high-frequency, high-precision oscillation. The oscillation frequency depends on the contrast and frame rate settings of the data processing computer 10.

[0071] The grating 4 is a blazed diffraction grating, possessing the functions of a traditional diffraction grating. It can perform lateral beam splitting on an incoming projection light source with a strip-shaped cross-section. The output projection light sources are arranged in two-dimensional space, with the lateral arrangement corresponding to each photon spectral band, and the vertical arrangement corresponding to the linear extension of the same spectral band as the input light source. The mechanical scanning component can precisely change the projection angle of each corresponding lateral photon spectral band by lateral oscillation, allowing the mechanical scanning grating to project each strip-shaped photon spectral band onto the central illumination area in turn within one scanning cycle.

[0072] The digital micromirror 5 is a DMD digital micromirror, possessing the functions of a traditional digital micromirror. It can perform high-frequency modulation on each pixel of the input area light source. Because its input light source is arranged in two-dimensional space, the horizontal arrangement corresponds to each photon spectral band, and the vertical arrangement corresponds to the same linear extension of the same spectral band as the input light source. When the light source oscillates laterally on the target surface of the digital micromirror 5, the hyperspectral spectrum can be modulated by the opening and closing of each pixel at different times.

[0073] The standard projection surface 8 is a standard whiteboard, which has the function of a traditional projection screen and can scatter the incident visible light spectrum.

[0074] The hyperspectral imager 9 is a traditional hyperspectral imager with a snapshot hyperspectral imaging function and an imaging speed of 20 frames per second. Through photography, it can capture the hyperspectral image displayed on the standard projection surface 8.

[0075] The data processing computer 10 is a traditional computer with image data processing and projection data transmission functions. After receiving the imaging data of the standard projected surface 8 from the hyperspectral imager, it can compare the current image with the required cloaking image and guide the digital micromirror to modulate the output spectrum.

[0076] In this embodiment, the scanning of the emitted light from the grating 4 is achieved by the oscillation of the fast-reflecting mirror 3. The fast-reflecting mirror 3 obtains instructions through a synchronous trigger to determine the oscillation frequency, oscillation angular velocity, and oscillation range. After processing by the grating 4, the processed projection light source output by the grating 4 is arranged in a two-dimensional space. The horizontal arrangement corresponds to each photon spectral band, and the vertical arrangement corresponds to the linear extension of the same spectral band light source and the input projection light source with a strip-shaped cross-section. Each uniform spectral band separated by the grating 4 can uniformly cover the target surface of the digital micromirror 5 within a set period, where the period is the reciprocal of the frequency of the fast-reflecting mirror 3.

[0077] In this embodiment, the fast reflector 3 is a driving device for a fast reflector that is already available on the market. It can achieve high-precision regular oscillation at a maximum frequency of 250Hz (single cycle 0.004 seconds) in the range of -0.8°, 0°, +0.8°, 0°, and -0.8°, in order to coordinate with the periodic oscillation of the output of the grating 4.

[0078] In this embodiment, the grating is a commercially available diffraction blaze with 300 lines / mm, a blaze angle of 4.3°, and a blaze wavelength of 500nm.

[0079] In this embodiment, the digital micromirror 5 is a traditional DMD digital micromirror with 1024×768 micromirrors, each 5.4μm in size, capable of intensity modulation of a single micromirror at 2.8MHz. During use, as the beam-splitting light source output by the grating 4 swings, the intensity of each sub-spectral band of periodically incident light can be modulated. When the digital micromirror 5 receives the beam-splitting light source output by the grating 4, each column of pixels corresponds to one sub-spectral band, and each row of pixels receives light from different spectral bands simultaneously. When the digital micromirror 5 projects light, each micromirror corresponds to one projection pixel.

[0080] In this embodiment, the projection lens 7 has a focal length of 100mm and is used to project the continuous spectrum light onto the projection surface to achieve hyperspectral imaging. The projection lens 7 can project pixels modulated by the digital micromirror 5, and its projection focal length can be adjusted for different projection distances.

[0081] In this embodiment, the hyperspectral imager 9 has 16 imaging bands.

[0082] In this embodiment, the data processing computer is a laptop computer.

[0083] Furthermore, the fast-reflecting mirror 3 performs light source scanning by oscillating at a natural frequency of 250Hz between -0.8° and 0.8° with a period of 0.004s. When used in conjunction with the grating, it enables 250Hz scanning of the spectroscopic spectrum.

[0084] Furthermore, the digital micromirror 5 is configured to perform pixel gating of a two-dimensionally arranged multi-spectral light source as needed to achieve spectral time modulation.

[0085] This embodiment discloses a method for using a hyperspectral stealth device. Using the hyperspectral stealth device as described above, the method includes the following steps:

[0086] Step S1: Obtain the prior hyperspectral cloaking image to be output;

[0087] Step S2: Acquire the current hyperspectral image of the standard projected surface using a hyperspectral imager.

[0088] Step S3: Use a data processing computer to process the hyperspectral cloaking image to be output and the current hyperspectral image acquired by the hyperspectral imager, and obtain the next frame of hyperspectral cloaking image to be output to the digital micromirror.

[0089] Step S4: Repeat steps S2 and S3 to make the hyperspectral projector stealth device continuously output the required hyperspectral stealth images.

[0090] In this embodiment, the collimating lens collimates and rectifies the full-spectrum LED light source, outputting continuous spectrum light, so that the light output to the grating light source after reflection by the fast-reflecting mirror is linear full-spectrum quasi-parallel light; the continuous spectrum output by the grating can be projected onto the digital micromirror at different times by the fast-reflecting mirror; after the digital micromirror modulates the output spectrum, a hyperspectral cloaking image can be formed on the standard projection surface; the projected hyperspectral cloaking image is acquired by a hyperspectral imager, and the data processing is controlled by a computer to achieve dynamic cloaking.

[0091] During the stealth process, the state of the standard projected surface needs to be iterated. After the data processing computer transmits the target image to the digital micromirror and projects it onto the standard projected surface, the standard projected surface is imaged by the hyperspectral imager, thus enabling the iterative stealth projection.

[0092] The specific embodiments described above only illustrate the design principles of the present invention. The shapes and names of the components in this description may differ and are not limited. Therefore, those skilled in the art can modify or make equivalent substitutions to the technical solutions described in the foregoing embodiments; and these modifications and substitutions do not depart from the inventive spirit and technical solutions of the present invention, and should all fall within the protection scope of the present invention.

Claims

1. A hyperspectral projection cloaking method, characterized in that: It comprises the following steps: Step S1: input the priori hyperspectral camouflage image data cube to be achieved; Step S2: use the hyperspectral imager to obtain the current hyperspectral image data cube of the standard object; Step S3: calculate the data cube of step S1 into the compressed target cube A by formula (1), and realize the compression of the hyperspectral image of the camouflage scene; calculate the data cube of step S2 into the compressed current cube B by formula (1); the compression method of the hyperspectral compression of the scene is shown in formula (1): Wherein, M is the number of bands; n is the extracted band number; j is the other band number of the image data cube, j = 1 ~ M; O n ,O j Is the extracted band data value of the target region; N n ,N j Is the extracted band data value of the target region; Step S4: compare the compressed target cube A and the compressed current cube B, and the comparison result is taken as the projection image and output by the hyperspectral projector; Step S5: repeat step S2 and step S3, compare the compressed target cube A and the compressed current cube B, and iterate the comparison result to the projection image; Step S6: repeat step S5, so that the hyperspectral projector continuously outputs the required hyperspectral camouflage image, that is, the hyperspectral projection camouflage is realized.

2. A hyperspectral projection cloaking device implementing the method of claim 1, characterized in that: It comprises a full-spectrum LED light source, a collimating mirror, a fast mirror, a grating, a digital micromirror, a synchronous trigger, a projection lens, a standard object, a hyperspectral imager, and a data calculation computer. The light source output by the grating changes the exit angle by swinging through the fast mirror, so that the light source output by the grating swings on the digital micromirror at the rear end of the light source, and the hyperspectral projection is realized.

3. The hyperspectral projection cloaking device of claim 2, wherein: The full-spectrum LED light source, the collimating mirror, the fast mirror, the grating, the digital micromirror, the synchronous trigger, and the projection lens form a hyperspectral projection assembly. The hyperspectral projector assembly is used to generate a dynamic hyperspectral projection image. The standard object is used to receive the hyperspectral projection image and scatter the projection light, so as to realize the projection camouflage effect. The hyperspectral imager is used to image the area containing the hyperspectral projection area in the standard object, and shoot the actual scattered light of the standard object. The data calculation computer is used to receive the image of the hyperspectral imager and perform real-time adaptive control on the output signal of the hyperspectral projector, so as to ensure the camouflage effect.

4. The hyperspectral projection camouflage device according to claim 3, wherein: The full-spectrum LED light source generates continuous spectrum light; The collimating mirror is placed vertically to the optical axis, and converges the continuous spectrum light in the vertical direction; The fast mirror is placed on the optical axis of the collimating mirror and located at the focal length of the collimating mirror, reflects the converged projection light to the grating, and swings quickly to enable the light source to be reflected to different positions of the grating; The grating is used to uniformly split the full-spectrum light of the projection light source and generate split light spectrum; The digital micromirror is used to receive the split light spectrum emitted by the grating, modulate the light intensity of the split light spectrum in each time period based on the opening and closing of the digital micromirror, and obtain continuous spectrum light in a time domain; The synchronous trigger is used to control the fast mirror and the digital micromirror to work at a corresponding frequency; The projection lens is used to project the continuous spectrum light received by the digital micromirror to the standard object; The standard object is used to sufficiently scatter the projection light emitted by the projection lens; The hyperspectral imager is used to perform hyperspectral imaging on the visible light band light scattered by the standard object; The data solving computer can acquire the output image of the hyperspectral imager and output the solving result to the synchronous trigger and the digital micro-mirror control digital micro-mirror.

5. The hyperspectral projection cloaking device of claim 4, wherein: The full-spectrum LED light source emits light covering the whole visible light spectrum. The collimating mirror converges the light emitted by the full-spectrum LED light source into a strip.

6. The hyperspectral projection cloaking device of claim 4, wherein: After the light source is reflected by the fast mirror, the strip-shaped light spot is converged on the grating. The projection light source processed by the grating is arranged in two-dimensional space, and the horizontal arrangement corresponds to each sub-spectrum, and the vertical arrangement corresponds to the same linear expansion of the input projection light source with a strip-shaped cross section. Each uniform spectrum segment divided by the grating can uniformly cover any pixel of the DMD array within a set period.

7. The hyperspectral projection cloaking device of claim 4, wherein: When the digital micro-mirror receives the light source output by the grating, each column of pixels corresponds to a sub-spectrum, and each row of pixels receives different spectrum light at the same time. When the digital micro-mirror projects, each micro-mirror corresponds to a projection pixel.

8. The hyperspectral projection cloaking device of claim 4, wherein: The digital micro-mirror is configured to select pixels of the two-dimensionally arranged multi-spectrum light source as needed to realize spectral time modulation.

9. The hyperspectral projection cloaking device of claim 4, wherein: The hyperspectral imager can cover the projection area projected onto the standard projection surface.

10. The hyperspectral projection cloaking device according to any one of claims 2 to 9, wherein: The working method of the device is as follows, Step one, input the target spectrum to be achieved into the data solving computer; Step two, use the hyperspectral imager to shoot the current hyperspectral image of the standard projection surface and input it into the data solving computer; Step three, after the data solving computer receives the hyperspectral images of the target scene and the current scene, it outputs the projection image to the hyperspectral projection assembly through solving; Step four, after the hyperspectral projection assembly receives the projection image, it projects the projection image onto the standard projection surface to change the spectrum of the standard projection surface; Step five, repeat steps two to four to make the spectrum of the standard projection surface the same as the target spectrum to be achieved, thereby achieving the cloaking effect.

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