CN102087504B - Optical mode recognizer based on single spatial light modulator and method thereof - Google Patents
Optical mode recognizer based on single spatial light modulator and method thereof Download PDFInfo
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- CN102087504B CN102087504B CN 201110028361 CN201110028361A CN102087504B CN 102087504 B CN102087504 B CN 102087504B CN 201110028361 CN201110028361 CN 201110028361 CN 201110028361 A CN201110028361 A CN 201110028361A CN 102087504 B CN102087504 B CN 102087504B
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Abstract
The invention discloses an optical mode recognizer based on a single spatial light modulator and a method thereof. The optical mode recognizer comprises a laser, a camera, a planar reflector, a spatial light modulator, a driver and a computer, wherein the spatial light modulator is controlled by the computer through the driver; the laser beam emitted by the laser irradiates the spatial light modulator and is reflected by the spatial light modulator; the reflected beam irradiates the planar reflector and is reflected by the planar reflector; the reflected beam then irradiates the spatial light modulator, and finally arrives at the camera after multiple reflection; and the camera is used for observing the optical signals. The optical mode recognizer can recognize the mode of an input object by writing the input object and a reference object on the same spatial light modulator, and can greatly reduce the size of the system at the same time. The optical mode recognizer has significant effects in character reading, fingerprint identification and the like.
Description
Technical field
The present invention relates to a kind of optical mode recognizer based on single spatial light modulator and method thereof.
Background technology
Optical Pattern Recognition proposes in eighties of last century the sixties, and the development through about 50 years has had significant progress.Its basic purpose is the pattern identical or close with reference model that identify in different target patterns, and most typical is the identification of image model.The range of application of Optical Pattern Recognition spreads all over the numerous areas such as military detection, fingerprint recognition, Chinese Character Recognition, photon calculating.Than electronic pattern identification, Optical Pattern Recognition has at a high speed, the large characteristics of capacity and concurrency.Simultaneously, Optical Pattern Recognition not only can be identified the intensity of image, can identify the phase place of optics simultaneously, calculates at photon, and the aspects such as photonic computer have the irrealizable characteristic of electronic pattern identification.
Traditional optical mode recognizer mainly comprises the special correlator of model Henricus Droog and joint transform correlator etc., but the problem that these mode discriminators mainly exist has: volume is too huge, adjust difficulty, and the adjustment quality of the efficient of pattern-recognition and system light path there are much relations.The present invention can be folding with system light path by add a plane mirror before spatial light modulator, reduced greatly the volume of system.Simultaneously, the present invention can realize the function of Optical Pattern Recognition, and in the situation that do not adjust hardware, by software programming, can carry out accurate adjustment to system light path.
Summary of the invention
The objective of the invention is in order to solve problems of the prior art, provide that a kind of volume is little, cost is low, adjust simply optical mode recognizer and method thereof based on single spatial light modulator.
Optical mode recognizer based on single spatial light modulator comprises laser instrument, camera, plane mirror, spatial light modulator, driver, computing machine; Spatial light modulator passes through driver control by computing machine; The Ear Mucosa Treated by He Ne Laser Irradiation that sends from laser instrument reflects in spatial light modulator, and reflected light is radiated on the plane mirror and reflects, and reflected light is radiated on the spatial light modulator again, through Multi reflection, finally by camera observation light signal.
Described plane mirror is surperficial parallel with spatial light modulator, and the width of plane mirror equals half of spatial light modulator liquid crystal surfactant width.
Distance between described plane mirror and the spatial light modulator surface is inversely proportional to the angle on incident light and spatial light modulator surface, is directly proportional with the focal length of the lens that show on the spatial light modulator.
To superpose with the phase type Fresnel Lenses respectively by the phase place that computing machine will be inputted thing and reference substance based on the Optical Pattern Recognition method of single spatial light modulator, form a secondary hologram, by the computer control driver hologram is presented on the spatial light modulator, the Ear Mucosa Treated by He Ne Laser Irradiation that sends from laser instrument reflects in spatial light modulator, reflected light has loaded the information of input thing, be radiated on the plane mirror and reflect, be focused on the spatial light modulator, through Multi reflection, finally inputted the coherent signal of thing and reference substance by camera observation.
The present invention utilizes at input thing and reference substance difference superposition phase type Fresnel Lenses, has realized the effect of the lens in the ordinary optical mode discriminator, has saved lens, has dwindled system bulk.In addition, by the folding effect of plane mirror to light path, utilize the computer control driver, the information of input thing and reference substance is write simultaneously left and right sides two parts of spatial light modulator, can realize the phase identification to the input thing.By the method, so that the system of optical identifier dwindles cost greatly.In the miniaturization of optical system, there is huge meaning integrated aspect.
Description of drawings
Fig. 1 is based on the system schematic of the optical mode recognizer of single spatial light modulator;
Fig. 2 is input phase bitmap;
Fig. 3 is the referential matter bitmap;
Fig. 4 is the phase diagram after reference substance is done Fourier transform;
Fig. 5 is the Fresnel Lenses phase diagram;
Fig. 6 is the phase diagram that Fresnel Lenses and the stack of input thing produce;
Fig. 7 is the phase diagram that Fresnel Lenses and Superimposed Filter produce;
Fig. 8 is integrated into a secondary figure with input thing and reference substance;
Fig. 9 is the optical correlation figure that obtains on the correlation surface.
Embodiment
As shown in drawings, the optical mode recognizer based on single spatial light modulator comprises laser instrument 1, camera 2, plane mirror 3, spatial light modulator 4, driver 5, computing machine 6; Spatial light modulator 4 is controlled by driver 5 by computing machine 6; The Ear Mucosa Treated by He Ne Laser Irradiation that sends from laser instrument 1 reflects in spatial light modulator 4, and reflected light is radiated on the plane mirror 3 and reflects, and reflected light is radiated on the spatial light modulator 4 again, through Multi reflection, finally by camera 2 observation light signals.
Described plane mirror 3 is surperficial parallel with spatial light modulator 4, and the width of plane mirror 3 equals half of spatial light modulator 4 liquid crystal surfactant width.
Distance between described plane mirror 3 and spatial light modulator 4 surfaces is inversely proportional to the angle on incident light and spatial light modulator 4 surfaces, is directly proportional with the focal length of the lens that show on the spatial light modulator 4.
To superpose with the phase type Fresnel Lenses respectively by the phase place that computing machine 6 will be inputted thing and reference substance based on the Optical Pattern Recognition method of single spatial light modulator, form a secondary hologram, by computing machine 6 control drivers 5 hologram is presented on the spatial light modulator 4, the Ear Mucosa Treated by He Ne Laser Irradiation that sends from laser instrument 1 reflects in spatial light modulator 4, reflected light has loaded the information of input thing, be radiated on the plane mirror 3 and reflect, be focused on the spatial light modulator 4, through Multi reflection, finally inputted the coherent signal of things and reference substance by camera 2 observations.
Embodiment
When directional light was radiated at spatial light modulator, by the modulating action of spatial light modulator, phase place and the intensity of input light can be modulated, thereby were loaded the information of input thing.By the computer control driver, spatial light modulator half the stack phase type Fresnel Lenses, by the effect of Fresnel Lenses, can to the input thing carry out Fourier transform.Afterwards, the Fourier transform picture of input thing is radiated on the plane mirror through reflection.By adjusting the distance between plane mirror and the spatial light modulator, so that input on second half that shines again spatial light modulator after the Fourier transform the position of image process of thing reflects, pass through again primary event, final correlated results is received by camera.Spatial light modulator other half put down in writing the Fourier transform picture of reference substance, and the Fresnel Lenses of the phase type that also superposes is used for realizing Fourier transform.By such method, can save the lens in the ordinary optical mode discriminator, dwindled the volume of system, in Optical Pattern Recognition, have very important significance.
Optical mode recognizer method for making based on single spatial light modulator may further comprise the steps:
1. adjust the diameter of laser instrument, so that the area of incident light equals spatial light modulator planar amasss half.Then adjust the incident direction of laser machine, make it the oblique left-half that is mapped to spatial light modulator, incident angle is about 1 °.
2. as shown in Figure 2, select the input thing that need to be identified by computing machine, and with its gray-scale value and Fresnel Lenses figure (as shown in Figure 5) stack, final formation image as shown in Figure 6.With crossing the computer control driver, image is as shown in Figure 6 imported the left-half of airborne photomodulator.
3. add a plane mirror in light path, area is half of spatial light modulator.The position of adjusting between plane mirror and the spatial light modulator also has distance, so that the two is parallel to each other.Then, adjust the distance between the two, so that can just in time be radiated at the right half part of spatial light modulator through the light behind spatial light surface left-half and the plane mirror secondary reflection.
4. select the image (as shown in Figure 3) of reference substance by computing machine, and it is done Fourier transform, and derive phase diagram (as shown in Figure 4).Then add the Fresnel Lenses (as shown in Figure 5) of a phase type thereon, finally obtain phase diagram as shown in Figure 7.And by computing machine and controller, phase diagram shown in Figure 7 is written to the right half part of spatial light modulator.
5. place a camera in the reflected light direction along the spatial light modulator right half part, be used for receiving last relevant picture.
When system will be to a certain image recognition, at first by computing machine this image is carried out Fourier transform and derives phase place, then with the Fresnel Lenses stack of a phase type.The phase place of the input thing that then needs is identified and the stack of another Fresnel Lenses.Afterwards, by the computer control driver, this two width of cloth image is imported respectively the both sides of spatial light modulator.Observe catoptrical light field by camera, when a very strong luminous point in finding light field, having occurred, just can judge, input the image that contains reference substance in the thing.By this method, can identify any optical mode, military and industrial huge application arranged.
Claims (4)
1. the optical mode recognizer based on single spatial light modulator is characterized in that comprising laser instrument (1), camera (2), plane mirror (3), spatial light modulator (4), driver (5), computing machine (6); Spatial light modulator (4) is controlled by driver (5) by computing machine (6), the input thing that namely need to be identified by computing machine (6) selection, and with its gray-scale value and Fresnel Lenses figure stack, form a secondary hologram, by computing machine (6) control driver (5), one secondary hologram is imported the left-half of spatial light modulator (4), select the image of reference substance by computing machine (6), and it is done Fourier transform, and the derivation phase diagram, then add the Fresnel Lenses of a phase type, obtain phase diagram, and by computing machine (6) and spatial light modulator (4), phase diagram is written to the right half part of spatial light modulator; The Ear Mucosa Treated by He Ne Laser Irradiation that sends from laser instrument (1) reflects in spatial light modulator (4), reflected light is radiated at plane mirror (3) and upward reflects, reflected light is radiated on the spatial light modulator (4) again, through Multi reflection, finally by camera (2) observation light signal.
2. a kind of optical mode recognizer based on single spatial light modulator as claimed in claim 1, it is characterized in that the surperficial parallel of described plane mirror (3) and spatial light modulator (4), the width of plane mirror (3) equals half of spatial light modulator (4) liquid crystal surfactant width.
3. a kind of optical mode recognizer based on single spatial light modulator as claimed in claim 1, it is characterized in that distance and incident light between described plane mirror (3) and spatial light modulator (4) surface and the angle on spatial light modulator (4) surface are inversely proportional to, and are directly proportional with the focal length of the upper lens that show of spatial light modulator (4).
4. one kind is used the as claimed in claim 1 Optical Pattern Recognition method based on single spatial light modulator of recognizer, it is characterized in that the phase place that will input thing and reference substance by computing machine (6) superposes with the phase type Fresnel Lenses respectively, form a secondary hologram, by computing machine (6) control driver (5) hologram is presented on the spatial light modulator (4), the Ear Mucosa Treated by He Ne Laser Irradiation that sends from laser instrument (1) reflects in spatial light modulator (4), reflected light has loaded the information of input thing, being radiated at plane mirror (3) upward reflects, be focused on the spatial light modulator (4), finally inputted the coherent signal of thing and reference substance by camera (2) observation.
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| US20070253043A1 (en) * | 2006-04-26 | 2007-11-01 | Bates Allen K | Apparatus and method for holographic information storage and retrieval |
| WO2007141707A2 (en) * | 2006-06-09 | 2007-12-13 | Koninklijke Philips Electronics N.V. | Holographic display using liquid crystal display device operating with unpolarized light |
| EP2033054A2 (en) * | 2006-06-09 | 2009-03-11 | Koninklijke Philips Electronics N.V. | Method of reducing effective pixel pitch in electroholographic display and electroholographic display including the same |
| CN101536094A (en) * | 2006-10-05 | 2009-09-16 | 夏普株式会社 | Hologram recording device, hologram reproducing device, information encoding method, recording method, and information reproducing method |
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