CN103645564B - The full light degeneration factor of two dimension for optical image security - Google Patents
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Abstract
The present invention discloses the full light degeneration factor of a kind of two dimension for optical image security, comprises image loading equipemtn, light signal superposition equipment, Amplitude amplification equipment, amplitude relaxation equipment and phase adjusted equipment; By Amplitude amplification equipment, the optical image signal being loaded with input picture is carried out Amplitude amplification, then through amplitude relaxation equipment, light signal fed back is fed back to closed loop, utilize phase adjusted equipment to realize the phase adjusted of light signal fed back, finally make the phase place of light signal fed back and input optical signal meet negative feedback condition; Light signal fed back and input optical signal realize superposition through light signal superposition equipment, and system exports optical image signal by analyzing, can Automatic adjusument closed loop optical device position and realize the superposition of coherent light signal and wave vector alignment thereof.Effectively can be applied to the various fields such as image enhaucament, image transmitting and faint image detection, relative classic method, it can full light is degenerative reduces systematic error simultaneously realizing.
Description
Technical field
The present invention relates to a kind of optical image security technology based on negative-feedback principle, specifically, is the full light degeneration factor of a kind of two dimension for optical image security.
Background technology
At present, feedback system based on optics is a lot, mainly concentrate on the ADAPTIVE OPTICS SYSTEMS based on Wavefront detecting and wavefront compensation principle, based on the coherent light feedback system of laser resonator principle, and based on inquiring into the full light feedback system of photorefractive material character.
In the ADAPTIVE OPTICS SYSTEMS based on Wavefront detecting and wavefront compensation principle, the realization of feedback is that controller utilizes Wavefront detecting result to regulate feedback to carry out wavefront compensation, controller input signal essence is electric signal, and whole backfeed loop converts based on light-electrical-optical; Also have and adopt optically addressed spatial light modulator to realize the modulation of optical information, but in this type systematic, the transmission of optical information is that the inherent characteristic of physically based deformation medium realizes, and essence is the transmittance process of light-physical medium-light, and the transmission path of light is also not closed; Feedback system based on laser resonator principle utilizes feedback to select the wavelength of light wave in resonator cavity and wave vector, to obtain the output optical signal with good directivity and coherence; Based on inquiring in the feedback system of photorefractive material character, mainly export the impact of analyzing crystal on coherent light amplitude or phase place according to system.
In existing optical feedback system, the feedback system essence based on light-electrical-optical or light-physical medium-light introduces isolation signals in the feedback loop, not the closed loop of All-optical signal, and the processing speed of electric signal constrains entire system operating rate; Based on inquiring into the full light feedback system of photorefractive material character and embodying system material characteristic or light path parameter based on the optical information that the coherent light feedback system of laser resonator principle exports, do not directly apply in optical image security.
Summary of the invention
For application limitation and the deficiency of existing optical feedback system, the invention provides a kind of coherent optics image processing techniques based on negative-feedback principle, for the demand that image enhaucament, image transmitting and faint image detection etc. are applied, propose the full light degeneration factor of a kind of two dimension for optical image security, while the alignment of guarantee wave vector, realize full light feedback.
In order to achieve the above object, concrete technical scheme of the present invention is as follows:
The full light degeneration factor of two dimension for optical image security, its key is: comprise the image loading equipemtn loaded mutually for realizing coherent source and input picture; For realizing the light signal superposition equipment inputting optical imagery and feedback optical image phase superposition; For realizing the Amplitude amplification equipment that optical imagery amplifies; For realizing the amplitude relaxation equipment of feedback attenuation; And for realizing the phase-adjusted phase adjusted equipment of feedback branch light signal; Wherein:
The optical imagery that described image loading equipemtn exports inputs as the original signal of light signal superposition equipment, the optical imagery that described phase adjusted equipment exports inputs as the feedback signal of light signal superposition equipment, the optical imagery that described light signal superposition equipment exports exports as output image after Amplitude amplification equipment, meanwhile, the optical imagery that Amplitude amplification equipment exports also is sent in described phase adjusted equipment through amplitude relaxation equipment.
Design based on said system, Amplitude amplification equipment can realize the amplification of optical imagery, realized acquisition and the amplitude fading of feedback optical image again by amplitude relaxation equipment simultaneously, the Wave-front phase of phase adjusted equipment to feedback optical image is utilized to correct, optical imagery and feedback optical image phase superposition will be inputted finally by light signal superposition equipment, in whole closed-loop system, optical imagery realizes feedback superposition through light path completely, phase adjusted equipment in feedback branch only changes the phase place of light signal fed back, unglazed-electrical-optical conversion links, this system is full light negative feedback structure, processing speed is fast, can realize at a high speed, parallel, jumbo optical image security.
As further describing, described coherent source is produced by helium-neon laser, and carry out collimate light through pinhole filter and collimation lens successively, the rear of described collimation lens is provided with amplitude type spatial light modulator, this amplitude type spatial light modulator loads input picture as described image loading equipemtn, the optical imagery that this amplitude type spatial light modulator exports is input in the second spectroscope as original signal, the first fourier lense is disposed with at second spectroscopical outbound course, photorefractive crystal and the second fourier lense, wherein, the back focal plane of the first fourier lense aligns with the front focal plane of the second fourier lense, and in this aligned position, described photorefractive crystal is installed, this photorefractive crystal realizes optical imagery as described Amplitude amplification equipment and amplifies, the outbound course of described second fourier lense is provided with the 3rd spectroscope, 3rd spectroscope realizes feedback attenuation as described amplitude relaxation equipment, output image is obtained in described 3rd spectroscopical transmission direction, described 3rd spectroscopical reflection direction is provided with phase type spatial light modulator, this phase type spatial light modulator is for obtaining feedback optical image and realizing the phase adjusted of feedback branch light signal as described phase adjusted equipment, the 3rd fourier lense and the 4th fourier lense is disposed with at the outbound course of phase type spatial light modulator, phase type spatial light modulator by after described 3rd fourier lense and the 4th fourier lense by feedback image information projection in described second spectroscope, the second spectroscope is utilized to realize the superposition of input optical imagery and feedback optical image as described light signal superposition equipment.
Helium-neon laser is mainly for generation of coherent source, this coherent source realizes the loading of input picture after collimation in amplitude type spatial light modulator, the optical imagery that amplitude type spatial light modulator exports enters in backfeed loop by the second spectroscope transmission, in this loop, optical imagery first realizes amplitude by photorefractive crystal to be strengthened, optical imagery after amplitude strengthens realizes image through the 3rd spectroscope transmission on the one hand and exports, by the 3rd spectroscope, optical imagery is reflexed in feedback branch on the other hand, realize feedback attenuation simultaneously.In feedback procedure, the Wave-front phase of phase type spatial light modulator to light signal fed back is used to correct, to make the phase place of feedback optical picture signal and the odd-multiple of phase differential close to pi/2 inputting optical image signal, optical imagery after phase correction finally projects in described second spectroscope and realizes feedback superposition after light path converting, owing to adopting cross polarization light, signal after superposition again enters light closed loop and returns, by regulating position and the phase correction of each optical device in closed loop, realize feedback signal parallel with the wavefront approximation of input signal, and in whole interference surface, the phase differential of two paths of signals is close to the odd-multiple of pi/2.When two paths of signals phase differential close to the odd-multiple of pi/2 and error is no more than the wavelength of π/4 time, then achieve the weakening of feedback signal to input optical signal.The interference superposition signal of photorefractive crystal to light signal fed back and input optical signal carries out Amplitude amplification repeatedly, when ensureing that the phase differential of light signal fed back and input optical signal satisfies condition, Absorbable organic halogens photorefractive crystal is to the amplification coefficient of light signal, and final full light realizes whole backfeed loop.
In order to realize coherent light polarization, be also respectively arranged with the first polaroid and the second polaroid in the front and back of described amplitude type spatial light modulator.
Because photorefractive crystal needs when realizing Amplitude amplification to add pump light source, in order to simplied system structure, the rear of described collimation lens is provided with the first spectroscope, this first spectroscopical transmitted light is injected in described amplitude type spatial light modulator, this first spectroscopical reflected light incides in the first reflective mirror through the 3rd polaroid, the reflected light path of the first reflective mirror is provided with the 5th fourier lense, described 5th fourier lense and described first fourier lense converge the light signal exported and are incident in described photorefractive crystal by identical incident angle symmetry.
By the first spectroscope, the coherent light that helium-neon laser produces is divided into the strong different light beam that still polarization direction is identical of two-beam, wherein stronger a branch of light beam is as the pump light signals in optical imagery Amplitude amplification process, project in described photorefractive crystal by the 3rd polaroid, the first reflective mirror and the 5th fourier lense, after more weak a branch of light beam is modulated to optical imagery, enter closed loop by first spectroscopical transmission direction.Photorefractive crystal produces two-beam coupling under pump light signals effect, the low light signals amplitude after coupling being loaded with input picture increases, phase invariant, first fourier lense and the 5th fourier lense focused on before flashlight and pump light enter photorefractive crystal, thus improved the gain amplifier of flashlight and pump light.
In order to the automatic calibration and feedback signal that realize feedback signal phase place align with the wave vector of input signal, the output light path of described 4th fourier lense is provided with the 4th spectroscope, by the 4th spectroscope, the feedback optical image that the 4th fourier lense exports is reflexed in described second spectroscope, described 3rd spectroscopical transmitted light path is provided with CCD photoelectrical coupler, described 4th spectroscopical transmitted light path is provided with Wavefront sensor, described phase type spatial light modulator is arranged on automatically controlled direction regulator, described CCD photoelectrical coupler, Wavefront sensor, phase type spatial light modulator and automatically controlled direction regulator are all connected on computer for controlling, described computer for controlling obtains the phase information of feedback optical image by described Wavefront sensor, thus control described phase type spatial light modulator and realize phase adjusted, this computer for controlling also obtains the strength information of output image by described CCD photoelectrical coupler, thus control described automatically controlled direction regulator realize feedback optical image with input optical imagery wave vector align.
In above-mentioned full light degeneration factor, light signal in system light path can to affect light signal fed back wave vector unjustified relative to input optical signal wave vector because of the micro-displacement of the device such as catoptron and spectroscope or angular deflection, and then the light signal superposition of influential system negative feedback loop.This programme utilizes computer for controlling obtained by CCD photoelectrical coupler and analyze output optical signal, realizes FEEDBACK CONTROL align with the wave vector of input optical signal to realize light signal fed back to the automatically controlled direction regulator in feedback light path.Its control procedure can be divided into two steps: first make each device displacement and angular deflection close to theory calls position by regulating manually; Then computer for controlling obtains output optical signal by CCD photoelectrical coupler, according to the departure degree of feedback branch light signal relative ideal angle in light signal strength information analysis light path, and then control automatically controlled direction regulator, utilize the micro-meter scale of automatically controlled direction regulator to regulate step-length to come the position of the automatically controlled direction regulator of meticulous adjustment to regulate light signal fed back wave vector.Adopt Wavefront sensor to obtain the wavefront phase information entering the light signal of feedback branch simultaneously, realized the automatic phase correction of phase type spatial light modulator by computer for controlling.As preferably, described amplitude type spatial light modulator and phase type spatial light modulator are electrical addressing spatial light modulator.
Remarkable result of the present invention is:
(1) based on the negative feedback closed loop loop that full light realizes, there is optical information processing high speed, parallel and jumbo feature, compare with electrical method, can information processing rate be improved; Negative feedback links can improve the unevenness of crystal to optical signal amplitude gain; Phase type spatial light modulator can be used for improving feedback signal wavefront distortion and the adjustment light signal phase place of feedback branch and the phase differential of input optical signal and meets close loop negative feedback condition, and stable negative feeds back.
(2) the output optical imagery realization that the computer for controlling in system can obtain according to CCD photoelectrical coupler is to the adjusted stepwise of light signal fed back and control.Utilize the rapidity regulated manually, the meticulous adjustment step-length in conjunction with automatically controlled direction regulator regulates angle and the position of optical device in backfeed loop, realizes system feedback light signal and aligns with the wave vector of input optical signal, can improve the efficiency regulating wave vector alignment.CCD photoelectrical coupler is used to catch output optical signal, be combined with automatically controlled direction regulator and realize feedback regulation, reduce wave vector alignment and regulate difficulty, alignd the binary image analysis be converted to output optical signal in the position alignment of light signal fed back and input optical signal and direction, improve and control reaction velocity.
Accompanying drawing explanation
Fig. 1 is system principle diagram of the present invention;
Fig. 2 is optical system topology diagram of the present invention.
Reference numeral in Fig. 2 is:
1 helium-neon laser, 2 pinhole filters, 3 collimation lenses, 4 first spectroscopes, 5 first polaroids, 6 amplitude type spatial light modulators, 7 second polaroids, 8 second spectroscopes, 9 first fourier lenses, 10 photorefractive crystals, 11 second fourier lenses, 12 the 3rd spectroscopes, 13CCD photoelectrical coupler, 14 phase type spatial light modulators, 15 automatically controlled direction regulators, 16 the 3rd fourier lenses, 17 the 4th fourier lenses, 18 the 4th spectroscopes, 19 Wavefront sensors, 20 computer for controlling, 21 first catoptrons, 22 the 5th fourier lenses, 23 the 3rd polaroids.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention and principle of work are described in further detail.
As shown in Figure 1, the full light degeneration factor of a kind of two dimension for optical image security, comprises the image loading equipemtn loaded mutually for realizing coherent source and input picture; For realizing the light signal superposition equipment inputting optical imagery and feedback optical image phase superposition; For realizing the Amplitude amplification equipment that optical imagery amplifies; For realizing the amplitude relaxation equipment of feedback attenuation; And for realizing the phase-adjusted phase adjusted equipment of feedback branch light signal; Wherein:
The optical imagery that described image loading equipemtn exports inputs as the original signal of light signal superposition equipment, the optical imagery that described phase adjusted equipment exports inputs as the feedback signal of light signal superposition equipment, the optical imagery that described light signal superposition equipment exports exports as output image after Amplitude amplification equipment, meanwhile, the optical imagery that Amplitude amplification equipment exports also is sent in described phase adjusted equipment through amplitude relaxation equipment.
For the light path system shown in Fig. 2, described coherent source is produced by helium-neon laser 1, and carry out collimate light through pinhole filter 2 and collimation lens 3 successively, wherein, pinhole filter 2 and helium-neon laser 1 are at a distance of 15cm, and be positioned on the front focal plane of collimation lens 3, at rear 10cm place installation first spectroscope 4 of collimation lens 3, along first spectroscope 4 transmission direction 10cm place's installation first polaroid 5, at the first 2cm place, polaroid 5 rear, amplitude type spatial light modulator 6 is set, this amplitude type spatial light modulator 6 loads input picture as described image loading equipemtn, at amplitude type spatial light modulator 6 rear 2cm place installation second polaroid 7, 15cm place installation second spectroscope 8 after the second polaroid 7, the optical imagery that amplitude type spatial light modulator 6 exports is input in the second spectroscope 8 as original signal, the first fourier lense 9 is disposed with at the outbound course of the second spectroscope 8, photorefractive crystal 10 and the second fourier lense 11, wherein, the back focal plane of the first fourier lense 9 aligns with the front focal plane of the second fourier lense 11, and in this aligned position, described photorefractive crystal 10 is installed, this photorefractive crystal 10 realizes optical imagery as described Amplitude amplification equipment and amplifies, the outbound course 5cm place of described second fourier lense 11 is provided with the 3rd spectroscope 12, 3rd spectroscope 12 realizes feedback attenuation as described amplitude relaxation equipment, CCD photoelectrical coupler 13 is installed at the transmission direction 25cm place of described 3rd spectroscope 12 and obtains output image, at the reflection direction 30cm place of described 3rd spectroscope 12, phase type spatial light modulator 14 is set, this phase type spatial light modulator 14 is for obtaining feedback optical image and realizing phase adjusted as described phase adjusted equipment, the 3rd fourier lense 16 and the 4th fourier lense 17 is disposed with at the outbound course of phase type spatial light modulator 14, wherein the back focal plane of the 3rd fourier lense 16 overlaps with the front focal plane of the 4th fourier lense 17, at the 4th fourier lense 17 optical axis direction 12cm place's installation the 4th spectroscope 18, phase type spatial light modulator 14 is by described 3rd fourier lense 16, 4th fourier lense 17 and the 4th spectroscope 18 by feedback image information projection in described second spectroscope 8, the second spectroscope 8 is utilized to realize input optical imagery and feedback optical image phase superposition as described light signal superposition equipment.
In order to provide pump light source in photorefractive crystal 10, at the 10cm place, reflections propagate direction of the first spectroscope 4, the 3rd polaroid 23 is installed, at the 3rd polaroid 23 rear 3cm place installation first reflective mirror 21, the 5cm place, reflections propagate direction of the first reflective mirror 21 is provided with the 5th fourier lense 22, and described 5th fourier lense 22 converges with described first fourier lense 9 light signal exported and is incident in described photorefractive crystal 10 by identical incident angle symmetry.
In order to the Wave-front phase realizing light signal fed back detects, at described 4th spectroscope 18 transmission direction 50cm place, Wavefront sensor 19 is installed, described phase type spatial light modulator 14 is arranged on automatically controlled direction regulator 15, described CCD photoelectrical coupler 13, Wavefront sensor 19, phase type spatial light modulator 14 and automatically controlled direction regulator 15 are all connected on computer for controlling 20, described computer for controlling 20 obtains the phase information of feedback optical image by described Wavefront sensor 19, thus control described phase type spatial light modulator 14 and realize phase adjusted, this computer for controlling 20 also obtains the strength information of output image by described CCD photoelectrical coupler 13, thus control described automatically controlled direction regulator 15 realize feedback optical image with input optical imagery wave vector align.
In specific implementation process:
The model of helium-neon laser 1 is Beijing University laser-HN250, and be the single-mode laser exported continuously, power is 2-100mw, and polarization ratio is 500:1, the angle of divergence Wei≤0.2mrad.
The model of pinhole filter 2 is SZ-52, pinhole diameter 10 μm.
The model of collimation lens 3 is GCO-0203M, and focal length is 400mm, and aperture diameter is 100mm.
Each spectroscopical light splitting angle is 90 °.
The focal length of each fourier lense is 300mm, and aperture diameter is 100mm.
Amplitude type spatial light modulator 6 is electrical addressing spatial light modulator, and its model is LCX038, and resolution is 1024 × 768, liquid crystal size is 14.4mm × 10.8mm, and pixel dimension is 14 μm × 14 μm, and refreshing frequency is 60Hz, contrast is 400:1, and most high-transmission rate is 21%.
Phase type spatial light modulator 14 is also electrical addressing spatial light modulator, and its model is PLUTO-VIS, and resolution is 1920 × 1080, and phase adjustment range is 2 π radian 420-700nm, and Pixel size is 8 μm, and picture frame frequency is 60Hz.
The model of Wavefront sensor 19 is HASO3-32, and duplicate measurements precision is less than λ/200, and inclination measurement sensitivity is 10
-3m
-1, spatial resolution is 160 μm.
Photorefractive crystal 10 adopts doped iron lithium niobate crystal, is of a size of 12mm*10mm, thick 2mm, effective aperture >90%, smooth finish 60/40, and the doping content of iron is 0.07wt%, not plated film.
Automatically controlled direction regulator 15 is made up of plain edition electric rotary table, automatically controlled angle displacement platform, card extender and motion controller, is Two Dimensional Rotating system, can realize the automatic conditioning equipment of two dimension angular adjustment.Plain edition electric rotary table model is LY110DXZ100J, and resolution is 0.01 °, and absolute fix precision is 0.01 °, and angular range is 360 °, center carrying 45kg; The model of automatically controlled angle translation stage is LY110DJW10M, and resolution is 0.005 ° (without segmentation), and absolute fix precision is ± 9 ", angular range is ± 10 °, center carrying 5kg; Card extender is the device connecting plain edition electric rotary table and automatically controlled angle displacement platform; Motion controller model is LY-MPC07, by conputer controlled, is closed-loop control system.
CCD photoelectrical coupler 13 adopts the cmos sensor being of a size of 22.3*14.9mm.
Principle of work of the present invention is:
By the second spectroscope 8, superposition is carried out to input optical imagery and feedback optical image, computer for controlling 20 regulates the wave vector direction of light signal fed back by the output image information analyzing the acquisition of CCD photoelectrical coupler 13, and after making two ways of optical signals superposition, wave vector is consistent.For ensureing that wave vector is consistent, in debug process, received image signal is set to the directive round spot of not tool, computer for controlling 20 introduces the output light image signal under feedback and isolation feedback two kinds of different situations by comparison, is alignd with the wave vector that angle realizes two ways of optical signals in the position being adjusted automatically controlled direction regulator 15 by wave vector alignment algorithm.
In addition, the optical imagery after application photorefractive crystal 10 pairs of superpositions carries out two-beam coupling amplification, and Nonlinear magnify rear portion enters feedback branch by spectroscope, and another part exports CCD photoelectrical coupler 13 to as system output signal.In close-loop feedback process, utilize the 3rd spectroscope 12 and the 4th spectroscope 18 can realize the decay of feedback signal, signal amplitude after light signal fed back amplitude relative amplitude is amplified has and obviously weakens, and closes rear system have stable negative feedback enlargement factor to realize negative feedback loop.
Phase adjusted is realized by phase type spatial light modulator 14 and Wavefront sensor 19, feedback optical picture signal Wave-front phase is made to meet negative feedback condition with input optical image signal Wave-front phase and reduce feedback light picture signal Wavefront aberration, compared with traditional optical feedback system, phase adjustment block has introduces negative feedback to improve the anti-interference function of amplifying element.
Finally it should be noted that, although be described with reference to embodiments of the invention here, but should be appreciated that, those skilled in the art can design a lot of other amendment and embodiment, such as, in the open scope of present specification, different unit types can be selected and adjust installation site, the conversion regime of each bar light path can be adjusted, can change the source of input picture to adapt to different application scenarios etc., these amendments and embodiment all drop within spirit disclosed in the present application and spirit.
Claims (6)
1. for the full light degeneration factor of two dimension of optical image security, it is characterized in that: comprise the image loading equipemtn loaded mutually for realizing coherent source and input picture; For realizing the light signal superposition equipment inputting optical imagery and feedback optical image phase superposition; For realizing the Amplitude amplification equipment that optical imagery amplifies; For realizing the amplitude relaxation equipment of feedback attenuation; And for realizing the phase-adjusted phase adjusted equipment of feedback branch light signal; Wherein:
The optical imagery that described image loading equipemtn exports inputs as the original signal of light signal superposition equipment, the optical imagery that described phase adjusted equipment exports inputs as the feedback signal of light signal superposition equipment, the optical imagery that described light signal superposition equipment exports exports as output image after Amplitude amplification equipment, meanwhile, the optical imagery that Amplitude amplification equipment exports also is sent in described phase adjusted equipment through amplitude relaxation equipment;
Described image loading equipemtn adopts amplitude type spatial light modulator (6), the optical imagery that this amplitude type spatial light modulator (6) exports is input in the second spectroscope (8) as original signal, the first fourier lense (9) is disposed with at the outbound course of the second spectroscope (8), photorefractive crystal (10) and the second fourier lense (11), wherein, the back focal plane of the first fourier lense (9) aligns with the front focal plane of the second fourier lense (11), and in this aligned position, described photorefractive crystal (10) is installed, this photorefractive crystal (10) realizes optical imagery as described Amplitude amplification equipment and amplifies, the outbound course of described second fourier lense (11) is provided with the 3rd spectroscope (12), 3rd spectroscope (12) realizes feedback attenuation as described amplitude relaxation equipment, output image is obtained in the transmission direction of described 3rd spectroscope (12), the reflection direction of described 3rd spectroscope (12) is provided with phase type spatial light modulator (14), this phase type spatial light modulator (14) is for obtaining feedback optical image and realizing the phase adjusted of feedback branch light signal as described phase adjusted equipment, the 3rd fourier lense (16) and the 4th fourier lense (17) is disposed with at the outbound course of phase type spatial light modulator (14), phase type spatial light modulator (14) is by projecting feedback image in described second spectroscope (8) after described 3rd fourier lense (16) and the 4th fourier lense (17), the second spectroscope (8) is utilized to realize the superposition of input optical imagery and feedback optical image as described light signal superposition equipment.
2. the full light degeneration factor of the two dimension for optical image security according to claim 1, it is characterized in that: described coherent source is produced by helium-neon laser (1), and carry out collimate light through pinhole filter (2) and collimation lens (3) successively, at the rear of described collimation lens (3), described amplitude type spatial light modulator (6) is set.
3. the full light degeneration factor of the two dimension for optical image security according to claim 2, is characterized in that: be respectively arranged with the first polaroid (5) and the second polaroid (7) in the front and back of described amplitude type spatial light modulator (6).
4. the full light degeneration factor of the two dimension for optical image security according to claim 3, it is characterized in that: the rear of described collimation lens (3) is provided with the first spectroscope (4), the transmitted light of this first spectroscope (4) is injected in described amplitude type spatial light modulator (6), the reflected light of this first spectroscope (4) incides in the first reflective mirror (21) through the 3rd polaroid (23), the reflected light path of the first reflective mirror (21) is provided with the 5th fourier lense (22), described 5th fourier lense (22) and described first fourier lense (9) are converged the light signal exported and are incident in described photorefractive crystal (10) by identical incident angle symmetry.
5. the full light of the two dimension for the optical image security degeneration factor according to claim 2-4 any one, it is characterized in that: on the output light path of described 4th fourier lense (17), be provided with the 4th spectroscope (18), by the 4th spectroscope (18), the feedback optical image that the 4th fourier lense (17) exports is reflexed in described second spectroscope (8), the transmitted light path of described 3rd spectroscope (12) is provided with CCD photoelectrical coupler (13), the transmitted light path of described 4th spectroscope (18) is provided with Wavefront sensor (19), described phase type spatial light modulator (14) is arranged on automatically controlled direction regulator (15), described CCD photoelectrical coupler (13), Wavefront sensor (19), phase type spatial light modulator (14) and automatically controlled direction regulator (15) are all connected on computer for controlling (20), described computer for controlling (20) obtains the phase information of feedback optical image by described Wavefront sensor (19), thus control described phase type spatial light modulator (14) and realize phase adjusted, this computer for controlling (20) also obtains the strength information of output image by described CCD photoelectrical coupler (13), thus control described automatically controlled direction regulator (15) realize feedback optical image with input optical imagery wave vector align.
6. the full light degeneration factor of the two dimension for optical image security according to claim 5, is characterized in that: described amplitude type spatial light modulator (6) and phase type spatial light modulator (14) are electrical addressing spatial light modulator.
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