CN103576430A - Spectral image projection method and device thereof - Google Patents
Spectral image projection method and device thereof Download PDFInfo
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Abstract
The invention relates to a spectral image projection method and a device thereof. According to the method, a frame period of a spectral image is divided into n time intervals; a light splitting element decomposes broadband illumination light into a series of monochromatic parallel light, and the illumination parallel light with different wavelengths enters a space light modulator after converged; the on-off state and the gray scale of the space light modulator are controlled, spectrum and intensity distribution of emergent light is adjusted, and the illumination parallel light with different wavelengths is sequentially output at each corresponding time interval; an image modulation unit sequentially outputs a gray image corresponding to the wavelength of the illumination light output by a spectrum modulation unit at each time interval; the obtained gray images are subjected to overlay processing, and the spectral image with a multispectral characteristic is output. The method and the device modulate spectrum and space information of an illumination light source respectively, so that precision simulation of spectral information and spatial information of a scene is realized, and the generated scene is more consistent with the actual scene. A spectral image projector is adopted for simulation, and the performance test result of an imaging system is more accurate and reliable.
Description
Technical field
The present invention relates to a kind of spectrum picture projecting method and device thereof.
Background technology
The scene projector can produce scene image true to nature according to the space of actual typical scene target, spectrum, radiation intensity feature.Imaging system gathers this emulating image, and image recognition circuit is analyzed rear captured target position to this image, produces feedback signal, adjusts in real time orientation, thereby realize target is followed the trail of.The optics scene projector utilizes optical system projection real scene simulated after by computer-generated image, thereby can the in the situation that of simulation test, verify the validity of imaging tracing system.Utilize the scene projector to carry out simulation test, can greatly shorten the cycle of system development, save research fund, therefore develop the Important Problems that the high performance scene projector becomes various countries scientific research personnel research.
According to the difference of using wave band, the scene projector can be divided into the visible ray scene projector and the large class of the infrared scene projector two.
The visible ray scene projector requires to have high-resolution, high refreshing frequency and higher contrast, has high requirements for output image light stability simultaneously.The at present domestic visible ray scene projector is roughly based on various projection display techniques, as cathode-ray tube display (CRT) technology, digital light are processed (DLP) technology, liquid crystal display (LCD) technology etc.The infrared scene projector mainly can be divided three classes: the one, and visible images transformation approach, change type infrared image simulation adopts thin-film transducer directly visible images to be converted to infrared image.The 2nd, direct infrared radiation method, mainly contains electric resistance array, diode laser matrix and infrared CRT.The 3rd, infrared radiation modulation method, mainly contains DMD infrared projection system and infrared liquid crystal light valve.
Along with the development of light spectrum image-forming technology and the demand of high precision imaging simulation, the scene projector has been proposed to new requirement, the spectrum picture projection arrangement with high spectral resolution becomes the study hotspot of the current scene projector.
Summary of the invention
What the present invention is directed to is the precision problem that the existing scene projector exists, a kind of can modulation the spectrum of scene and spatial information proposed, export more the spectrum picture projector of photorealism scene and the projecting method of spectrum picture thereof, for imaging system emulation provides precisely simulation means reliably.
The invention provides a kind of spectrum picture projecting method, comprise the steps:
1, the beam splitter of spectral modulation unit resolves into a series of monochromatic collimated beams by broadband illumination light, the illumination directional light of different wave length after assembling to spatial light modulator;
2, a frame period of spectrum picture is divided into n period, controls on off state and the gray shade scale of spatial light modulator, regulate spectrum and the intensity distributions of emergent light, in each period of correspondence, export successively the illumination directional light of different wave length;
3, image modulation unit gray level image corresponding to illumination light wavelength that output is exported with spectral modulation unit successively in each period;
4, the gray level image obtaining is carried out to overlap-add procedure, output has the spectrographic images of multispectral characteristic.
Technical solution of the present invention also provides a kind of spectrum picture projection arrangement, comprises broadband lighting source, image modulation unit, projection optics system and spectral modulation unit; Described spectral modulation unit comprises incident coupling optical system, slit, collimating optical system, beam splitter, convergence optical system, spatial light modulator and outgoing coupling optical system; The illumination light that incident coupling optical system produces broadband lighting source is coupled in slit after assembling, the incident light that enters slit is incident to beam splitter and carries out light splitting after colimated light system collimation, broadband illumination light is resolved into a series of monochromatic collimated beam outgoing, through convergence optical system, monochromatic collimated beam is assembled to spatial light modulator; Control on off state and the gray shade scale of spatial light modulator, regulate spectrum and the intensity distributions of emergent light, the light signal of spatial light modulator output exports image modulation unit to after the coupling of outgoing coupling optical system; The two-dimensional scene image that image modulation unit produces projects away image through projection optics system.
Spatial light modulator of the present invention is Digital Micromirror Device, or is LCD space light modulator.Described beam splitter is prism, or is grating.
Compare with traditional spectrum picture shadow casting technique, the present invention has following feature:
1, spectrum picture projecting method provided by the invention, can modulate respectively the spectrum of lighting source and spatial information, has realized the accurate simulation of scene spectral information and spatial information, and scene and the actual scene of its generation are more identical.Adopt spectrum picture projection arrangement to carry out analog simulation, the result of imaging system performance test more accurately, reliably.
2, the simultaneously spectral distribution of modulate illumination light and the space distribution of image of spectrum picture projection arrangement provided by the invention, realizes the projection of spectrum picture.Spectral modulation unit adopts dispersion light splitting mode, has the advantages such as spectral resolution is high, compact conformation; The spectrum of spectral modulation unit by using spatial light modulator after to dispersion light splitting is modulated, and has the advantages such as modulation system is flexible, modulating speed is fast.
3, spectrum picture projection arrangement compact conformation provided by the invention, adopts Digital Control, and highly versatile, can produce adjustable " high emulation " image scene of spectral distribution.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of a kind of spectrum picture projection arrangement provided by the invention;
Fig. 2 is a kind of spectrum picture projection arrangement image modulation cellular construction block diagram provided by the invention;
Fig. 3 is a kind of spectrum picture projection arrangement spectral modulation cellular construction block diagram provided by the invention;
The structural representation of the spectral modulation unit that Fig. 4 provides for the embodiment of the present invention 1;
Fig. 5 is the fundamental diagram that spectral modulation of the present invention unit carries out spectral modulation;
Fig. 6 is the fundamental diagram that a kind of spectrum picture projection arrangement provided by the invention carries out the projection of spectrum scene;
The structural representation of the spectral modulation unit that Fig. 7 provides for the embodiment of the present invention 2.
Wherein: 1, incident coupling optical system; 2, slit; 3, collimating optical system; 4, prism; 5, convergence optical system; 6, spatial light modulator; 7, outgoing coupling optical system; 8, collimating mirror; 9, grating; 10, convergence reflex mirror.
Specific embodiments
Below in conjunction with drawings and Examples, spectrum picture projecting method of the present invention and device thereof are described in further detail.
Embodiment 1
Referring to accompanying drawing 1, it is the theory diagram of spectrum picture projection arrangement provided by the invention.Broadband illuminator produces the radiation of high strength wide range, and its wavelength band is 0.4～1.1um, comprises light source, the illumination optical system homogenizer etc. of unifying.The required illumination light of rear output is modulated to the spectrum of broadband lighting source emergent light in spectral modulation unit.As required, the illumination light of output can be monochromatic light, can be also that spectrum is through the broadband illumination light of ovennodulation.Image modulation unit produces the two-dimensional scene image under different wave length illumination light.Projection optics system projects away the image of image modulation unit output.For emergent pupil apart from shorter, bore little and to the projector size situation without specific (special) requirements, the light path design of projection optics system can adopt Polaroid mode.For the situation of large emergent pupil distance and long reach, the secondary imaging mode that can adopt collimator objective and projection objective to combine.
Referring to accompanying drawing 2, it is the theory diagram of image modulation provided by the invention unit.Mainly comprise homogenizer, colimated light system and spatial light modulator etc.Spectral modulation unit emergent light, after homogenizer, forms Uniform Illumination light.After colimated light system, lighting space photomodulator.In spatial light modulator, generate the image that needs projection, illumination light generates the space two-dimensional intensity map under specific wavelength after spatial light modulator, and exports projection optics system to.
Referring to accompanying drawing 3, it is the theory diagram of spectral modulation of the present invention unit.The illumination light that incident coupling optical system produces illuminator is coupled in slit after assembling.The incident light that enters slit is incident to beam splitter and carries out light splitting after colimated light system collimation.Through beam splitter light splitting, broadband illumination light is broken down into a series of monochromatic collimated beam outgoing, and its shooting angle of the directional light of different wave length is different.Convergence system is assembled these monochromatic collimated beams, and spatial light modulator is positioned at the focal plane place of convergence system.The light of the corresponding different wave length of every a line of spatial light modulator, the pixel dimension of spatial light modulator determines the minimum light spectral resolution that spectral modulation unit can reach.By controlling switch and the gray shade scale of spatial light modulator, can regulate according to demand spectrum and the intensity distributions of emergent light.
Referring to accompanying drawing 4, the structural representation of the spectral modulation unit that it provides for the present embodiment, comprises incident coupling optical system 1, slit 2, collimating optical system 3, prism 4, convergence optical system 5, spatial light modulator 6 and outgoing coupling optical system 7.Prism 4 is beam splitter, the directional light of collimation system 3 outgoing carries out light splitting, the outgoing directional light of the different wave length after light splitting is assembled to spatial light modulator 6 through convergence optical system 5, control the switch of spatial light modulator 6 and spectrum and the intensity distributions that gray shade scale regulates emergent light, finally by outgoing coupling optical system 7, export image modulation unit to.In the present embodiment, spatial light modulator adopts Digital Micromirror Device.
Referring to accompanying drawing 5, it is the schematic diagram that spectral modulation of the present invention unit carries out spectral modulation.In figure (a) for incident illumination light source is through after light splitting, the distribution of different wavelengths of light in spatial light modulator.Each row of spatial light modulator are corresponding to different outgoing wavelength.The wavelength of emergent ray and the row coordinate in spatial light modulator are linear.Regulate switch and the transmitance of each row of spatial light modulator, can control the spectral distribution of emergent ray.(b1) on representation space photomodulator, the pixel transmitance corresponding to wavelength X 1 is maximum, and other pixel transmitances are 0, are (c1) corresponding output spectrum; (b2) on representation space photomodulator corresponding to the transmitance of wavelength X 1 be peaked half, other pixel transmitances are 0, are (c2) corresponding output spectrum, its peak strength is half of (c1); (b3) on representation space photomodulator, the pixel corresponding to wavelength X 1～λ 4 has different transmitances, and other pixel transmitances are 0, (c3) curve of spectrum for exporting.By controlling switch and the gray shade scale of spatial light modulator, can regulate according to demand spectrum and the intensity distributions of emergent light.
Referring to accompanying drawing 6, the fundamental diagram that it carries out the projection of spectrum scene for the present invention generates successively multiple image within a frame period, utilizes " integration " characteristic of Image-forming instrument, and the stack by image produces the image scene with multispectral characteristic and exports.Wish generates the multispectral image of a width as shown in (a) in figure, need to be divided into t1, t2, t3 and tetra-periods of t4 one frame period, by spectral modulation unit, in each period, exported successively red, yellow, and green and blue illumination light, corresponding with it, the gray level image corresponding to red, yellow, and green and blue light is exported successively in image modulation unit in each period.By the image intensity in the frame period, superpose, obtain required multispectral image.
Embodiment 2
Referring to accompanying drawing 7, the structural representation of the spectral modulation unit that it provides for the present embodiment, comprising incident coupling optical system 1, slit 2, collimating mirror 8, grating 9, convergence reflex mirror 10, spatial light modulator 6 and outgoing coupling optical system 7.Grating 9 is beam splitter, the directional light of collimation catoptron 8 outgoing carries out light splitting, the outgoing directional light of the different wave length after light splitting is assembled to spatial light modulator 6 through convergence reflex mirror 10, control the switch of spatial light modulator 6 and spectrum and the intensity distributions that gray shade scale regulates emergent light, finally by outgoing coupling optical system 7, export image modulation unit to.In the present embodiment, spatial light modulator is LCD space light modulator.
Press the technical scheme of embodiment mono-, the required illumination light of rear output is modulated to the spectrum of broadband lighting source emergent light in spectral modulation unit.As required, the illumination light of output can be monochromatic light, can be also that spectrum is through the broadband illumination light of ovennodulation.
Image modulation unit produces the two-dimensional scene image under different wave length illumination light.Projection optics system projects away the image of image modulation unit output.
Claims (6)
1. a spectrum picture projecting method, is characterized in that comprising the steps:
(1) beam splitter of spectral modulation unit resolves into a series of monochromatic collimated beams by broadband illumination light, the illumination directional light of different wave length after assembling to spatial light modulator;
(2) frame period of spectrum picture is divided into n period, controls on off state and the gray shade scale of spatial light modulator, regulate spectrum and the intensity distributions of emergent light, in each period of correspondence, export successively the illumination directional light of different wave length;
(3) image modulation unit gray level image corresponding to illumination light wavelength that output is exported with spectral modulation unit successively in each period;
(4) gray level image obtaining is carried out to overlap-add procedure, output has the spectrographic images of multispectral characteristic.
2. a spectrum picture projection arrangement, comprises broadband lighting source, and image modulation unit and projection optics system, is characterized in that: it also comprises spectral modulation unit; Described spectral modulation unit comprises incident coupling optical system, slit, collimating optical system, beam splitter, convergence optical system, spatial light modulator and outgoing coupling optical system; The illumination light that incident coupling optical system produces broadband lighting source is coupled in slit after assembling, the incident light that enters slit is incident to beam splitter and carries out light splitting after colimated light system collimation, broadband illumination light is resolved into a series of monochromatic collimated beam outgoing, through convergence optical system, monochromatic collimated beam is assembled to spatial light modulator; Control on off state and the gray shade scale of spatial light modulator, regulate spectrum and the intensity distributions of emergent light, the light signal of spatial light modulator output exports image modulation unit to after the coupling of outgoing coupling optical system; The two-dimensional scene image that image modulation unit produces projects away image through projection optics system.
3. a kind of spectrum picture projection arrangement according to claim 2, is characterized in that: described spatial light modulator is Digital Micromirror Device.
4. a kind of spectrum picture projection arrangement according to claim 1, is characterized in that: described spatial light modulator is LCD space light modulator.
5. a kind of spectrum picture projection arrangement according to claim 1, is characterized in that: described beam splitter is prism.
6. a kind of spectrum picture projection arrangement according to claim 1, is characterized in that: described beam splitter is grating.
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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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Application publication date: 20140212 |