CN113992903A - Method, system, equipment and storage medium for spectrum-adjustable image projection - Google Patents
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- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3155—Modulator illumination systems for controlling the light source
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- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
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Abstract
The invention provides a method, a system, equipment and a storage medium for spectrally-adjustable image projection, wherein the method comprises the following steps: determining the range of an initial light source spectrum by controlling the temperature of a light source, dispersing light emitted by the light source, and collimating and projecting the dispersed light to a first spatial light modulator; gating the light with each wavelength after dispersion through the first spatial light modulator, converging the gated light and then projecting the converged light to the second spatial light modulator; displaying a gray level image by the second spatial light modulator in a pulse width gray level modulation mode; and projecting the light modulated by the second spatial light modulator through a projection lens into a detector optical system under test. The invention can realize spectral modulation with 100nm resolution.
Description
Technical Field
The present invention relates to the field of spectral modulation, and more particularly, to a method, system, device, and storage medium for spectrally tunable image projection.
Background
Because the field test has the problems of high cost of manpower and material resources, weather restriction and the like, the existing detector identification test is mostly carried out indoors in advance. Under special conditions, similar spectral characteristics may exist between a target to be detected and interference in a certain wide spectral band, so that the detector cannot identify the target and the interference, and therefore, the conventional detector is developed from a traditional single band to a multi-band direction, and the purpose is to successfully identify the difference between the target and the interference in a finer band. The optical scene projection technology can simulate the optical characteristics of dynamic targets and backgrounds in real time and can provide a high-resolution training video source. In order to improve the identification precision of the detector for the target type, the optical scene projection technology is also required to have multiband simulation capability. However, the conventional multiband image simulator based On DLP (Digital Light Processing), LCD (Liquid Crystal Display) or LCoS (Liquid Crystal On Silicon) mainly works in visible Light and near infrared bands, and cannot realize medium and long wave infrared band image simulation.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, a system, a computer device, and a computer readable storage medium for spectrally-adjustable image projection, in which the range of an initial light source spectrum is determined by controlling a light source temperature, and the spectrum is further modulated by two spatial light modulators, so that spectral modulation with a resolution of 100nm can be implemented, and mid-and long-wavelength infrared band image simulation can be implemented.
In view of the above, an aspect of the embodiments of the present invention provides a method for projecting a spectrally adjustable image, including the following steps: determining the range of an initial light source spectrum by controlling the temperature of a light source, dispersing light emitted by the light source, and collimating and projecting the dispersed light to a first spatial light modulator; gating the light with each wavelength after dispersion through the first spatial light modulator, converging the gated light and then projecting the converged light to the second spatial light modulator; displaying a gray level image by the second spatial light modulator in a pulse width gray level modulation mode; and projecting the light modulated by the second spatial light modulator through a projection lens into a detector optical system under test.
In some embodiments, the determining the range of the initial light source spectrum by controlling the light source temperature comprises: the position of the spectrum peak wavelength is determined by controlling the temperature of the light source, and a rectangular diaphragm is arranged at the emergent end of the light source to control the emergent light intensity and the spot shape of the light source.
In some embodiments, the dispersing the light from the light source and collimating and projecting the dispersed light onto the first spatial light modulator comprises: the light emitted by the light source is projected to the dispersion unit in parallel, the spectrum is spread in space through the dispersion unit, and the light with different wavelengths after dispersion is projected to the first spatial light modulator in a collimation mode through the first convergence lens.
In some embodiments, said gating of dispersed wavelengths of light by said first spatial light modulator comprises: responding to the on state of a micro mirror in the first spatial light modulator, and reflecting light with a preset wave band to enter a second converging lens; and reflecting light of other wave bands except the preset wave band into an absorption cell in response to the micro-mirror in the second spatial light modulator being in an off state.
In some embodiments, said gating of dispersed wavelengths of light by said first spatial light modulator comprises: equally dividing the initial light source spectrum into multiple parts in the column direction according to the resolution of the first spatial light modulator.
In some embodiments, said gating of dispersed wavelengths of light by said first spatial light modulator comprises: the gated waveband light intensity is further regulated and controlled within the range of the initial light source spectrum by controlling the proportion of the on-state of the micro-mirrors in the row direction.
In some embodiments, said displaying a gray scale image in a pulse width gray scale modulation mode by said second spatial light modulator comprises: and converting the numerical value of the gray level image to be displayed into a binary system, setting the bit plane which is the first digit in the converted binary system to be in an on state, and setting the rest bit planes to be in an off state.
In another aspect of the embodiments of the present invention, there is provided a spectrally adjustable image projection apparatus, including:
the device comprises a light source, a collimating lens, a dispersion unit, a first converging lens, a first spatial light modulator, a second converging lens, a light homogenizer, a second spatial light modulator and a projection lens; the light source, the collimating lens, the dispersion unit, the first converging lens, the first spatial light modulator, the second converging lens, the light homogenizer, the second spatial light modulator and the projection lens are sequentially arranged along a light path;
the light source emits light with an adjustable spectral range, and the spectral range is determined by controlling the temperature of the light source;
the collimating lens projects the light to the dispersion unit in parallel;
the dispersion unit is used for dispersing the light;
the first converging lens collimates and projects the dispersed light to the first spatial light modulator;
the first spatial light modulator gates the light with each wavelength after dispersion;
the second converging lens converges the gated light to the light homogenizer;
the light uniformizer is used for homogenizing the light converged to the light uniformizer and then projecting the light to the second spatial light modulator;
the second spatial light modulator is used for displaying gray level images on the light modulated by the first spatial light modulator; and
and the projection lens is used for projecting the light modulated by the second spatial light modulator.
In another aspect of the embodiments of the present invention, there is also provided a computer device, including: at least one processor; and a memory storing computer instructions executable on the processor, the instructions when executed by the processor implementing the steps of the method as above.
In a further aspect of the embodiments of the present invention, a computer-readable storage medium is also provided, in which a computer program for implementing the above method steps is stored when the computer program is executed by a processor.
The invention has the following beneficial technical effects: the spectrum range of the initial light source is determined by controlling the temperature of the light source, and the spectrum is further modulated by the two spatial light modulators, so that the spectrum modulation with the resolution of 100nm can be realized, and the simulation of the medium-wavelength and long-wavelength infrared band images can be realized.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art 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 that other embodiments can be obtained by using the drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of a method of spectrally tunable image projection provided by the present invention;
FIG. 2 is a schematic diagram of a spectrally tunable image projection arrangement provided by the present invention;
FIG. 3 is a schematic diagram of a first spatial light modulator gating scheme provided by the present invention;
FIG. 4 is a schematic diagram of a hardware configuration of an embodiment of a computer apparatus for spectrally tunable image projection provided by the present invention;
FIG. 5 is a schematic diagram of an embodiment of a computer storage medium for spectrally tunable image projection provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
In a first aspect of embodiments of the present invention, embodiments of a method for spectrally tunable image projection are presented. Fig. 1 shows a schematic diagram of an embodiment of the method of spectrally tunable image projection provided by the present invention. As shown in fig. 1, the embodiment of the present invention includes the following steps:
s1, determining the range of the initial light source spectrum by controlling the temperature of the light source, dispersing the light emitted by the light source, and collimating and projecting the dispersed light to the first spatial light modulator;
s2, gating the light with each wavelength after dispersion through the first spatial light modulator, converging the gated light and then projecting the converged light to the second spatial light modulator;
s3, displaying a gray image by the second spatial light modulator in a pulse width gray scale modulation mode; and
and S4, projecting the light modulated by the second spatial light modulator into the optical system of the detector through the projection lens.
In a second aspect of the embodiments of the present invention, a spectrally adjustable image projection apparatus is provided. FIG. 2 is a schematic diagram of the image projection apparatus with adjustable spectrum according to the present invention, which is illustrated with reference to FIG. 2 by taking a 2-12 μm spectrum of a medium-wavelength band and a long-wavelength band as an example.
A spectrally tunable image projection apparatus comprising: the system comprises a light source 110, a collimating lens 111, a dispersion unit 120, a first converging lens 121, a first spatial light modulator 130, a second converging lens 131, a light homogenizer 132, a second spatial light modulator 140 and a projection lens 150; the light source 110, the collimating lens 111, the dispersing unit 120, the first converging lens 121, the first spatial light modulator 130, the second converging lens 131, the light homogenizer 132, the second spatial light modulator 140, and the projection lens 150 are sequentially arranged along a light path.
The light source 110 emits light with an adjustable spectral range, which is determined by controlling the temperature of the light source;
the collimating lens 111 projects the light to the dispersion unit 120 in parallel;
the dispersion unit 120 that disperses the light;
the first converging lens 121 collimates and projects the dispersed light to the first spatial light modulator 130;
the first spatial light modulator 130 gates the dispersed light with each wavelength;
the second focusing lens 131 focuses the gated light to the light homogenizer 132;
the light homogenizer 132 homogenizes the light converged on the light homogenizer 132 and projects the homogenized light to the second spatial light modulator 140;
the second spatial light modulator 140, which performs gray scale image display on the light modulated by the first spatial light modulator 130; and
the projection lens 150 projects the light modulated by the second spatial light modulator 140.
The light source 110 in the embodiment of the present invention is selected as a broad spectrum light source, and the dispersion unit 120 is selected as a prism having a triangular pyramid structure. The collimating lens in the embodiment of the present invention is a cylindrical lens group structure, and is used for projecting the light of the broad spectrum light source 110 to the dispersion unit 120 in parallel. Since the wavelengths dispersed by the prism are not parallel, the wavelengths need to be collimated and projected onto the first spatial light modulator 130 through the first focusing lens 121. The narrow-band light gated by the first spatial light modulator 130 is still spatially separated, and therefore needs to be mixed again by using the second focusing lens 131, and then homogenized by using the light homogenizer 132, in the embodiment of the present invention, the light homogenizer 132 uses a rectangular light homogenizing rod, and in other embodiments, other light homogenizers can be used, and finally the light is projected onto the second spatial light modulator 140.
The wide-spectrum light source in the embodiment of the invention selects the high-temperature black body, and the actual temperature of the black body influences the radiation intensity and the position of the peak wavelength of the radiation spectrum. According to planck's blackbody radiation law, the radiation intensity at wavelength λ of a blackbody with an actual temperature T is expressed as:
wherein, c1=3.743×10-12W·cm2Is the first radiation constant, c2And =1.439cm · K is the second radiation constant.
The range of the initial light source spectrum is determined by controlling the temperature of the light source, the light emitted by the light source is dispersed, and the dispersed light is collimated and projected to the first spatial light modulator. The temperature of the black body influences the position of the spectral peak wavelength and meets the Wien displacement lawλ m T=2896μm·K。
In some embodiments, the determining the range of the initial light source spectrum by controlling the light source temperature comprises: the position of the spectrum peak wavelength is determined by controlling the temperature of the light source, and a rectangular diaphragm is arranged at the emergent end of the light source to control the emergent light intensity and the spot shape of the light source. The higher the blackbody temperature, the shorter the wavelength shift of the peak. Thus, a change in the initial source spectral range can be achieved by controlling the black body temperature. Due to the existence of the atmospheric window, the embodiment of the invention mainly concerns short wave 2-3 μm, medium wave 3-5 μm and long wave 8-12 μm. The emergent light intensity and the light spot shape of the black body can be further controlled by adding the rectangular diaphragm at the emergent end of the black body.
In some embodiments, the dispersing the light from the light source and collimating and projecting the dispersed light onto the first spatial light modulator comprises: the light emitted by the light source is projected to the dispersion unit in parallel, the spectrum is spread in space through the dispersion unit, and the light with different wavelengths after dispersion is projected to the first spatial light modulator in a collimation mode through the first convergence lens. The dispersion unit is used for spreading the broad spectrum in space, and can be designed into a diffraction optical element, a blazed grating, a prism and the like. Diffractive optical elements are typically used as beam splitters, requiring customization and fewer sub-optical path bands. Blazed gratings are commonly used in spectrometers, and although the dispersed light is spatially continuous, the spectra of different orders of diffracted light overlap, requiring additional filters. Therefore, the invention selects the prism with the triangular pyramid structure to split light, and eliminates the defects of the prism and the prism. All the optical device materials are ZnSe and meet the transmission of a wave band of 2-12 mu m.
And gating the light with each wavelength after dispersion through the first spatial light modulator, converging the gated light, and then projecting the converged light to the second spatial light modulator. The first spatial light modulator is equivalent to an optical switch, and spatially gates the dispersed light, and the embodiment of the invention takes a DMD (Digital Micro-mirror Device) Device of a type XGA of TI corporation as an example, and the resolution is 1024 × 768. The DMD consists of an array of micromirrors mounted on CMOS (Complementary Metal-Oxide-Semiconductor) memory cells, each micromirror representing a pixel, which can be flipped to +12 ° (on) and-12 ° (off). The switching state of the micromirror is modulated by the binary value of 1 (on)/0 (off) of the underlying memory cell. Thus, by loading the DMD with different gray scale images, the switching state of the micromirror array can be controlled in real time.
In some embodiments, said gating of dispersed wavelengths of light by said first spatial light modulator comprises: responding to the on state of a micro mirror in the first spatial light modulator, and reflecting light with a preset wave band to enter a second converging lens; and reflecting light of other wave bands except the preset wave band into an absorption cell in response to the micro-mirror in the second spatial light modulator being in an off state. When the micro-mirror is in an on state, the DMD reflects input light of a specified waveband and enters a second converging lens; when the micro-mirror is in an off state, the DMD reflects the input light of other wave bands to enter the absorption cell. Since the XGA model DMD is mainly used for visible light, it needs to be replaced with an infrared window.
In some embodiments, said gating of dispersed wavelengths of light by said first spatial light modulator comprises: equally dividing the initial light source spectrum into multiple parts in the column direction according to the resolution of the first spatial light modulator.
Fig. 3 is a gating schematic diagram of the first spatial light modulator provided by the present invention, in the embodiment of the present invention, the resolution of the first spatial light modulator is 1024 × 768, and the column direction (1024 direction) of the first spatial light modulator is used as the spectrum gating direction, so that 2 to 12 μm can be thinned to 1024 parts, and the maximum spectrum resolution can reach 100 nm. For convenience of illustration, fig. 3 equally divides the broad spectrum into 10 parts only, white for on-state and black for off-state, so that the first spatial light modulator gates light of two wavelength bands of 3-4 μm and 8-10 μm.
In some embodiments, said gating of dispersed wavelengths of light by said first spatial light modulator comprises: the gated waveband light intensity is further regulated and controlled within the range of the initial light source spectrum by controlling the proportion of the on-state of the micro-mirrors in the row direction. By controlling the proportion of the on states of the micromirrors in the row direction (768 directions), the gated narrow-band light intensity can be further regulated and controlled on the basis of the blackbody radiation spectrum.
And displaying a gray scale image by the second spatial light modulator in a pulse width gray scale modulation mode.
In some embodiments, said displaying a gray scale image in a pulse width gray scale modulation mode by said second spatial light modulator comprises: and converting the numerical value of the gray level image to be displayed into a binary system, setting the bit plane which is the first digit in the converted binary system to be in an on state, and setting the rest bit planes to be in an off state.
The second spatial light modulator is an imaging device and still adopts a DMD. The second spatial light modulator displays the underlying stored gray scale image using a conventional pulse width gray scale modulation scheme. The display time for each bit-plane is binary weighted, e.g., 512 gray scale with 9 bit-planes, the ratio of display time from high (bit-plane 8) to low (bit-plane 0) is 256:128:64:32:16:8:4:2: 1. The DMD is required to load 9 times with data and flip the micromirror 9 times. When 212 (011010100) gray is displayed, bit plane 7/6/4/2 is in the on state and the rest are in the off state. The first number may be 1 in embodiments of the present invention, and 0 in other embodiments.
And projecting the light modulated by the second spatial light modulator into a detector optical system to be detected through a projection lens. And projecting the modulated light of the second spatial light modulator into the optical system of the detector to be detected through the infrared optical projection lens.
In alternative embodiments, embodiments of the present invention may also be used for other wavelength band (visible, near infrared, and any combination) spectral modulation, with only a different choice of light source, optics materials, and spatial light modulator. In order to improve the spectral resolution, the first spatial light modulator and the second spatial light modulator of the present invention may select higher resolution, for example 2560 × 2048, or may be spliced into higher resolution by using a plurality of spatial light modulators.
The embodiment of the invention determines the range of the initial light source spectrum by controlling the temperature of the light source, and further modulates the spectrum by two spatial light modulators, thereby realizing the spectrum modulation with the resolution of 100nm and realizing the simulation of the images of the medium-wavelength and long-wavelength infrared bands.
It should be particularly noted that the steps in the embodiments of the method for projecting a spectrally adjustable image described above can be mutually intersected, replaced, added, or deleted, and therefore, these methods for projecting a spectrally adjustable image that are transformed by reasonable permutation and combination should also fall within the scope of the present invention, and should not limit the scope of the present invention to the embodiments.
In view of the above object, a third aspect of the embodiments of the present invention provides a computer device, including: at least one processor; and a memory storing computer instructions executable on the processor, the instructions being executable by the processor to perform the steps of: s1, determining the range of the initial light source spectrum by controlling the temperature of the light source, dispersing the light emitted by the light source, and collimating and projecting the dispersed light to the first spatial light modulator; s2, gating the light with each wavelength after dispersion through the first spatial light modulator, converging the gated light and then projecting the converged light to the second spatial light modulator; s3, displaying a gray image by the second spatial light modulator in a pulse width gray scale modulation mode; and S4, projecting the light modulated by the second spatial light modulator into the optical system of the detector through the projection lens.
In some embodiments, the determining the range of the initial light source spectrum by controlling the light source temperature comprises: the position of the spectrum peak wavelength is determined by controlling the temperature of the light source, and a rectangular diaphragm is arranged at the emergent end of the light source to control the emergent light intensity and the spot shape of the light source.
In some embodiments, the dispersing the light from the light source and collimating and projecting the dispersed light onto the first spatial light modulator comprises: the light emitted by the light source is projected to the dispersion unit in parallel, the spectrum is spread in space through the dispersion unit, and the light with different wavelengths after dispersion is projected to the first spatial light modulator in a collimation mode through the first convergence lens.
In some embodiments, said gating of dispersed wavelengths of light by said first spatial light modulator comprises: responding to the on state of a micro mirror in the first spatial light modulator, and reflecting light with a preset wave band to enter a second converging lens; and reflecting light of other wave bands except the preset wave band into an absorption cell in response to the micro-mirror in the second spatial light modulator being in an off state.
In some embodiments, said gating of dispersed wavelengths of light by said first spatial light modulator comprises: equally dividing the initial light source spectrum into multiple parts in the column direction according to the resolution of the first spatial light modulator.
In some embodiments, said gating of dispersed wavelengths of light by said first spatial light modulator comprises: the gated waveband light intensity is further regulated and controlled within the range of the initial light source spectrum by controlling the proportion of the on-state of the micro-mirrors in the row direction.
In some embodiments, said displaying a gray scale image in a pulse width gray scale modulation mode by said second spatial light modulator comprises: and converting the numerical value of the gray level image to be displayed into a binary system, setting the bit plane which is the first digit in the converted binary system to be in an on state, and setting the rest bit planes to be in an off state.
Fig. 4 is a schematic hardware structure diagram of an embodiment of the computer apparatus for spectrally tunable image projection provided in the present invention.
Taking the device shown in fig. 4 as an example, the device includes a processor 301 and a memory 302.
The processor 301 and the memory 302 may be connected by a bus or other means, such as the bus connection shown in fig. 4.
The memory 302 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created from use of a method of spectrally tunable image projection, and the like. Further, the memory 302 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, memory 302 optionally includes memory located remotely from processor 301, which may be connected to a local module via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Any of the embodiments of the computer apparatus for performing the method for spectrally tunable image projection described above may achieve the same or similar effects as any of the previously described method embodiments corresponding thereto.
The invention also provides a computer-readable storage medium having stored thereon a computer program for executing the method of spectrally tunable image projection when executed by a processor.
FIG. 5 is a schematic diagram of an embodiment of a computer storage medium for the above-described spectrally tunable image projection provided by the present invention. Taking the computer storage medium as shown in fig. 5 as an example, the computer readable storage medium 401 stores a computer program 402 which, when executed by a processor, performs the method as described above.
Finally, it should be noted that, as one of ordinary skill in the art can appreciate that all or part of the processes of the methods of the above embodiments can be implemented by a computer program to instruct related hardware, and the program of the method for spectrally tunable image projection can be stored in a computer readable storage medium, and when executed, the program can include the processes of the embodiments of the methods described above. The storage medium of the program may be a magnetic disk, an optical disk, a Read Only Memory (ROM), a Random Access Memory (RAM), or the like. The embodiments of the computer program may achieve the same or similar effects as any of the above-described method embodiments.
The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the present disclosure as defined by the appended claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
It should be understood that, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly supports the exception. It should also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items.
The numbers of the embodiments disclosed in the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of the embodiments of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070285345A1 (en) * | 2003-11-01 | 2007-12-13 | Hirokazu Nishino | Image display system implements a light source with a contrllable schedule to emit light of adjustable intensities |
| CN103576430A (en) * | 2013-11-20 | 2014-02-12 | 苏州大学 | Spectral image projection method and device thereof |
| CN105467597A (en) * | 2015-11-27 | 2016-04-06 | 北京振兴计量测试研究所 | Multi-spectral starlight light source |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070285345A1 (en) * | 2003-11-01 | 2007-12-13 | Hirokazu Nishino | Image display system implements a light source with a contrllable schedule to emit light of adjustable intensities |
| CN103576430A (en) * | 2013-11-20 | 2014-02-12 | 苏州大学 | Spectral image projection method and device thereof |
| CN105467597A (en) * | 2015-11-27 | 2016-04-06 | 北京振兴计量测试研究所 | Multi-spectral starlight light source |
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Application publication date: 20220128 |