JP3802241B2 - Method and apparatus for identifying character strings, multiple shapes, etc. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for identifying a character string, a plurality of shapes, and the like that can optically detect the shape of an object, characters and figures written on the surface of the object, and the presence position thereof, and more specifically As a technology for accurately and quickly identifying the shape and dimensions of objects that occupy a large part in the inspection of manufactured parts and products, and as a technology for instantaneous identification of multiple car plate numbers or postal codes on highway roads, The present invention also relates to a method and an apparatus for identifying character strings and plural shapes, which are suitable as techniques for automatically reading bar codes and simultaneously identifying character strings, numeric strings, plural shapes, etc. as the eyes of an intelligent robot. Furthermore, in academic basic fields, for example, as a method for identifying blood cells and living cells in medicine and biology, as an automatic measurement method for particle shape and size in environmental engineering, aerosol research, powder engineering, and further in energy engineering, The present invention relates to a method and an apparatus for identifying character strings and plural shapes that can be used in a wide range of techniques such as quantitative visualization of flow velocity in the field of fluid engineering.
[0002]
[Prior art]
Conventionally, as a method of identifying a character string, a plurality of shapes, and the like, a method of identifying images captured from a CCD camera one image at a time using a digital computer, or on a photographic dry plate using one multiple matched filter There was a method to identify the shape and size of character strings and particle groups.
[0003]
[Problems to be solved by the invention]
However, the method and apparatus for identifying a character string / plural shapes as described above have the following problems to be solved.
[0004]
[Problem 1]
In the shape identification method based on the digital calculation method, the shape to be identified must be brought into the middle of the computer screen, and one character or one shape must be sequentially identified for each pixel. It is necessary to prepare a dedicated image analysis circuit such as a transputer for the number of simultaneous identifications, which requires a lot of time and cost for the identification analysis. That is, there are drawbacks such as simultaneous parallel identification of a plurality of shapes is difficult, and simultaneous in situ processing of a plurality of pieces of image information is difficult.
[0005]
[Problem 2]
Although the conventional multiple matched filter method has the advantage that the simultaneous identification and the identification time are processed at high speed as a simultaneous identification method for multiple shapes, etc., it takes time and preparation to capture the identified shapes. Therefore, real-time discrimination measurement was difficult except for special applications. In addition, the hologram (multiple matched filter) is difficult to create in order to reduce the influence of disturbance vibrations in the optical darkroom to less than ¼ wavelength of incident light in the optical darkroom. As a preparatory work to install the group identification algorithm, the arrangement of the reference shape group must be created on the photographic plate, the complexity and difficulty of the identification algorithm installation work, and the real-time capture of the identified shape group is object light There are problems such as inconvenience of being limited to the front focal plane of the inner Fourier transform lens.
[0006]
[Problem 3]
Conventionally, as a method for installing (installing) the shape identification algorithm, the arrangement of the reference shape group is drawn on the paper surface, transferred to the photographic plate, installed in the optical system, and information on the identification shape arrangement appropriate for the hologram plate Therefore, it took a lot of time and skill to do so. That is, there is a disadvantage that real-time identification is impossible while taking inconveniences with an identification algorithm and capturing a character string, a plurality of shapes, etc. from an electronic camera. In addition, there was no idea of performing rapid optical neuroprocessing for multi-shape identification.
[0007]
Therefore, the present invention employs the following method in order to solve the above-described conventional problems.
[0008]
That is, for the above problem 1,
(1) An optical analog calculation method using a multiple matched filter method that is good at simultaneous parallel real-time identification of a plurality of shapes is used.
The multiple matched filter method used for simultaneous identification of a plurality of shapes and the like is as follows. When objects (reference shapes) of the shape to be identified are placed apart from each other on the front focal plane of the convex lens in the parallel light of the laser, those objects Light diffraction Patterns appear overlapping on the back focal plane of the lens, centered on the optical axis. Therefore, if a hologram dry plate is placed on the rear focal plane and a hologram is formed by interfering the reference light and the light diffraction pattern group, the respective object shape identification information is simultaneously recorded on one hologram. After removing the reference shape and blocking the reference light, if an object to be identified is put in the front focal plane, the diffracted light from the object group hits the hologram and is identified, and if there is the same shape as the reference shape, the reference light is regenerated by it. The When the reference light is collected by the lens, shape identification correlated light (object identification autocorrelation light) appears on the focal plane in real time at the position of the object to be identified and the position of the point target for each measurement region of each shape. The shapes and positions of a plurality of objects to be identified can be determined simultaneously by the area where the autocorrelation light appears and the position in the area.
[0009]
Also, for the above problems 2 and 3,
(1) Solvent vapor development type photoconductive plastic hologram simple and rapid automatic development device is integrated with a laser light source and hologram creation optical system on one rail-shaped optical bench to eliminate the influence of disturbance vibration and optical A hologram is automatically created in a bright place without the need for a dark room.
(2) The identified shape group taken from the electronic camera into the integrated hologram creating apparatus is subjected to incoherent coherent conversion by the image projection device and the spatial light modulator, and the hologram dry plate is subjected to real-time information of the identified shape group. Can project To do .
(3) The algorithm is created and loaded by locating the reference shape from the image taken from the electronic camera with a microcomputer, and irradiating it to the photoconductive plastic plate on the hologram automatic production device through the image projection device and spatial light modulator. To create multiple matched filters.
[0010]
[Means for Solving the Problems]
Therefore, the problem solving means adopted by the present invention is:
Spatial light on which a laser light source, a hologram creating optical system having a half mirror, and transmitted light from the half mirror are irradiated onto a single optical base, and a character string and a plurality of shapes are projected from a small CRT video projector. Incorporating a modulator, the small CRT image projection device that projects a character string, a plurality of shapes, and the like captured from an electronic camera onto the spatial light modulator, and a hologram automatic creation device such as a photoconductive plastic, are incorporated in the order described above, A multiple matched filter is created by the light from the laser light source, the character string projected from the CRT image projection device and a plurality of reference shapes, and the actual character string projected from the CRT image projection device, etc. Character string or multiple shape identification characterized by performing shape identification by projecting a group of shapes to be identified onto the multiple matched filter In location is there.
The spatial light modulator is a character string projected from the small CRT video projection device. And multiple shapes It has a function to convert incoherent and coherent images into a coherent image by laser With a string or multi-shape identification device is there.
Further, the small CRT image projection device that projects a character string, a plurality of shapes and the like captured from an electronic camera onto the spatial light modulator and the spatial light modulator are replaced with a liquid crystal display device. With a string or multi-shape identification device is there.
Further, the shape identification is performed by a two-dimensional optical information processing device, and is a character string or multiple shape identification device.
[0011]
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[0012]
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[0013]
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[0014]
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[0015]
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[0016]
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[0017]
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[0018]
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[0019]
Embodiment
Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a system according to the present embodiment.
In the figure, 1 is an optical rail as an optical base, 2 is a laser light source, 3 is an optical shutter, 4 is a half-wave plate, 5 is an objective lens, 6 is a spatial light filter (SF), and 7 is for creating parallel light. Convex lens (CL), 8 is a half mirror (translucent mirror HM) or polarizing beam splitter, 9 is a spatial light modulator (SLM), 10 is a compact CRT video projector, 11 is a polarizing plate (P), 12 is a mirror ( M1) and 13 are convex lenses (L1), 14 is an automatic hologram generator (PPH), 15 is a mirror (reflecting mirror M2), 16 is Dimming Filter and filter holder (FH), 17 is solvent steam 18 is a high voltage supply device, 19 is a convex lens (L2), 20 is a two-dimensional light receiving array (two-dimensional optical information processing device), 21 is a high-speed digital camera or high-speed analog camera (hereinafter referred to as an electronic camera), and 22 is a frame. Memory, 23, computer, 24, optical neuro-processing device, 25, identification result display, 31, half-wave plate + polarization mirror (polarization plane rotator), 32, 33, polarization mirror, 34, polarizing plate, 35 It is a two-dimensional light receiving array.
[0020]
The hologram automatic creator (PPH) 14 applies a planar electrode as a transparent electrode film on a transparent glass plate with a high voltage supply electrode installed to cause corona discharge in the hologram developing device, and applies light to the electrode. An antireflection transparent flat electrode formed by applying an antireflection film is provided, and a high voltage is supplied from the high voltage supply device 18. In addition, the two-dimensional optical information processing apparatus 20 has a function of simultaneously reading in parallel the intensity and position of weak light including a two-dimensional optical array.
[0021]
The system captures characters captured from a laser light source 2, hologram creation optical systems 4, 5, 6, 7, 8, 11, 12, 13, 15, 16 and an electronic camera 21 on one optical rail 1. Spatial light modulator 9 having a function of converting a character string or the like projected from a small CRT image projection device 10 that projects a plurality of shapes into a coherent image by incoherent / coherent conversion with a laser, photoconductive plastic, etc. The hologram automatic creation apparatus 14 of the above, and an optical system and a two-dimensional receiving array that simultaneously capture the shape identification correlated light constitute a multi-shape real-time parallel optical analog calculation identification apparatus.
[0022]
Hereinafter, functions of the components will be described.
The functions of the optical system and the like are as follows.
Laser light emitted from a He—Ne laser light source 2 of about 5 mW passes through the optical shutter 3, passes through the half-wave plate 4, and is expanded with little intensity unevenness by the spatial filter 6 including the objective lens 5 and the pinhole. The light is converted into a light beam, and is converted into parallel light having a uniform intensity by the parallel light generating convex lens 7. Further, the parallel laser light is divided into two by a half mirror (HM) 8, one transmitted light is irradiated on the surface P1 surface of the spatial light modulator (SLM) 9 as object light, and the other reflected parallel light is reflected as reference light. Enter mirror (M2) 15 Dimming The light passes through the filter and the neutral density filter on the filter holder 16 and is irradiated to a photoconductive plastic dry plate or the like installed on the surface P2 of the hologram automatic creator 14.
[0023]
Now, a group of shapes taken from the electronic camera 21 into the small CRT image projection device 10 is projected onto the spatial light modulator (SLM) 9 to form a polarized image group on the surface of the SLM. When the light hits, the object shape group undergoes a polarization change, and the reflected light including the shape information subjected to incoherent coherent conversion on the surface P1 surface of the spatial light modulator (SLM) 9 is reflected by the half mirror (HM) 8 and polarized. By passing through the plate (P) 11, only the shape information light is extracted. The coherent shape information light reflected by the mirror (M1) 12 is Fourier-transformed by a convex lens (L1) 13 having P1 as a front focal plane, and a shape group that overlaps the center of the optical axis on the rear focal plane P2 of the convex lens 13 Are formed. If the interference between the light diffraction pattern group and the reference light is taken as a hologram, it becomes a multiple matched filter. Instead of the convex lens 13 placed in the object beam and having a hologram dry plate such as a photoconductive plastic dry plate as a back focal point, a binary lens or a size / rotation that can identify the same shape regardless of the size / rotation angle is used. Those including an optical filter capable of angularly unbiased identification can be used. Further, the distance between the P1 surface and the convex lens (L1) 13 may be shorter than the focal length of the convex lens (L1) 13.
[0024]
The mounting method of the shape identification algorithm is as follows.
The identified shape group captured from the electronic camera 21 or the like is taken into the personal computer 23. A reference shape group desired to be identified is selected and arranged on the personal computer 23 so as to be separated from each other so that the identification areas do not overlap with each other, thereby creating an identification algorithm. The small CRT image projection apparatus 10 applies the identification algorithm to the spatial light modulator 9. Project. The spatial light modulator 9 is irradiated with hologram forming object light, and the image information of the arranged reference shape group is incoherently coherently converted, and Fourier transformed by the lens (L1) 13 to be the back focal point of the lens 13. A hologram is produced by being projected on a hologram dry plate placed on the surface P2. For the hologram production, for example, a solvent vapor development type photoconductive plastic hologram automatic production device is used. The photoconductive plastic hologram is rapidly automatically developed to form a multiple matched filter. This completes the mounting of the multiple shape identification algorithm. In the photoconductive plastic hologram, the plastic layer of the dry plate is preferably composed of a rosin ester containing a disproportionated rosin glycerin ester (Super Esta A-75).
Note that the installation (installation) of the algorithm does not pass the path of the electronic camera 21, the small CRT video projection device 10, the spatial light modulator 9, etc., but directly places the object on the front focal plane of the lens 13 in the optical path including the lens 13. It can also be arranged.
[0025]
Identification of multiple shapes is performed as follows.
First, the reference light is blocked. A group of identified objects captured from the electronic camera 21 is converted into a coherent image through the small CRT image projection device 10 and the spatial light modulator 9, and is Fourier-transformed by the lens (L1) 13 and irradiated onto the hologram dry plate. Are simultaneously identified in real time by multiple matched filters. If the identified shape group has the same shape as the reference shape, the reference light that interferes with the shape pattern is regenerated by the shape object light from the function of the multiple matched filter, and is collected by the convex lens (L2) 19.
[0026]
That is, the identification result of the shape group is reproduced reference light in each shape identification region formed around the same position as the reference shape installation position on the rear focal plane P3 of the convex lens 19 installed on the rear focal plane of P2. As a group of bright spots of autocorrelation light that is a group, it appears at the position and point object of the identified object. Therefore, the position of the autocorrelation light in each shape identification area on the P3 plane can be instantaneously measured by the two-dimensional information processing apparatus 20, and the position, distribution and arrangement of each shape group can be instantly known simultaneously. When the object to be identified is placed directly in the optical path without using the electronic camera 21, the convex lens (L1) is installed in the same manner as when the reference shape is placed in the optical path and the algorithm is directly installed. By passing the object to be identified through the 13 front focal planes, that is, the object shape can be directly identified by the following method.
[0027]
Measurement of an actual object without using the electronic camera 21 is performed, for example, by changing the half mirror 8 described above to a normal deflection mirror (8 ′) and all the parallel light beams that have passed through the parallel light generating convex lens 7 are directed toward the polarizing plate 11. This is done by setting the direction of the deflecting mirror 8 'so that it is reflected. Behind the convex lens 7 for creating parallel light, a position having the same distance to the surface position of the deflecting mirror 8 ′ and the spatial light modulator 9 is set symmetrically with respect to the deflecting mirror 8 ′, and the position is taken as a measurement field of view of the real object. To do. The magnification of the measurement optical system for the real object is adjusted. When the object shape is identified from the light diffraction pattern by the multiple matched filter, the distance between the surface of the multiple matched filter and the convex lens 13 needs to be the same as the rear focal length of the convex lens 13, but the object to be identified is the convex lens 13. Need not be in front focal length.
[0028]
If the shape to be identified is unclear or has a shape similar to the reference shape, the difference in intensity between the autocorrelation light and the cross-correlation light is not clear in the correlated light group appearing on the P3 plane, and neuro discrimination is used for shape group identification. It will be necessary. The multiple shape identification neuro process is performed as follows.
In the digital neuro processing, the light intensity of the correlated light group appearing on the P3 plane is captured by a two-dimensional optical array or the like and converted into an electrical signal, digital neuro calculation processing is performed, correct shape discrimination determination is performed, and the discrimination result is displayed on the monitor. Take the way.
[0029]
In order to perform optical analog parallel instantaneous neuro processing, a polarization nonlinear intensity reflector composed of a half-wave plate + polarizer + nonlinear intensity reflector on the P3 surface 31 When the correlated light group is polarized and the intensity is reflected by a non-linear intensity distribution, the coherent light converted into the parallel reference light group by the convex lens (L2) 19 irradiates the P2 plane multiple matched filter from the back side. Thereby, the object light group is reproduced on the object light optical path. The object light group is reflected by the polarization mirror 32 installed on the object light optical path, and again irradiates the multiple matched filter. Then, the reference light group is reproduced by the object light group, and the correlated light group is formed again on the same P3 surface by the convex lens 19. These correlation light groups show the result of the neuro discrimination where the autocorrelation light group is emphasized and the cross correlation light group is weakened.
[0030]
【Example】
In FIG. 1, the entire optical analog calculation identification optical system is arranged and supported on an optical rail 1 for arranging one optical system. The length of the rail 1 is, for example, about 1500 mm to 800 mm. All the optical elements constituting the optical analog calculation / identification optical system (described in detail later) are firmly fixed and supported on the optical rail 1. Therefore, even if the optical rail 1 vibrates, the optical relationship between the optical elements on the optical rail is unchanged. Therefore, it is possible to prevent disturbance to light wave interference due to external vibration. Accordingly, it is also possible to move the optical analog calculation identification optical system to another place with the optical rail 1. A carrier and a rod stand (not shown) are used to fix the optical elements of the optical analog calculation identification optical system on the optical rail 1. They are used for adjusting the optical path of the optical system, adjusting the position of the optical element, etc., but are firmly affirmed by screws. The adjustment function of these carriers and rod stands may be omitted when the optical system is designed for fixing.
[0031]
The optical analog calculation and identification optical system assembled on the optical rail 1 and various optical elements constituting it are as follows. The light source is, for example, 10 mW He-N e-ray 2 The laser 2 is fixed to a rod 43 by, for example, a round holder 42 and obtains a coherent parallel light beam having a diameter of about 1 mm. This light beam is irradiated on the aluminum bench 1 in parallel to the bench. The laser light source can be replaced with an optical system that irradiates coherent semiconductor laser light as parallel light. The irradiated parallel laser light is condensed by, for example, a x40 (40 ×) microscope objective lens 5 through the optical shutter 3 and the half-wave plate 4, and almost through the spatial light filter 6 made of a pinhole having a hole diameter of about 200 μm. Expanded light with uniform intensity and uniform intensity is produced, and expanded parallel light having a diameter of 40 to 60 mm is obtained through the parallel light generating convex lens 7. The coherent parallel laser light beam that has passed through the spatial light filter 6 is divided into two by the half mirror 8, and one is irradiated to the spatial light modulator SLM9 as object light. The other is reflected by the mirror (M2) 15 as reference light, passes through the neutral density filter 16, and is applied to the hologram dry plate.
[0032]
In the spatial light modulator (SLM) 9, the reference shape taken from the electronic camera 21 is created by the frame memory 22 and the personal computer 23 according to the shape group identification algorithm. It is irradiated to a spatial light modulator (SLM) 9. A reference shape arrangement algorithm image is created on the SLM 9. The reference shape image group information on the SLM 9 is converted into a coherent image group by the object light irradiated on the SLM 9, is reflected by the half mirror 8, and only the object light on which only the polarization image information is put on the polarizing plate 11 is selected. Then, it is Fourier-transformed by the convex lens 13 through the mirror 12 and irradiated onto the hologram dry plate installed in the hologram automatic generator 14 as a light diffraction pattern of an image group. If the interference fringes between the object light and the reference light are developed and fixed by a hologram dry plate, one multiple matched filter is produced.
[0033]
After the reference light is shielded, the reference shape is removed, the identified shape group is captured by the electronic camera 21, and the identified shape group is projected onto the SLM 9, that is, the front focal plane P 1 of the convex lens 13 by the small CRT video projector 10. For example, a coherent image group having an object shape subjected to incoherent / coherent transformation is Fourier-transformed on the convex lens 13, and the diffracted light group corresponds to a multiple matched filter on the P2 plane. If there is the same shape as the reference shape in the identified object shape group, the reference light that the same shape has been identified by the hologram that is a multiple matched filter is reproduced. When the reference light is collected by the convex lens 19, the autocorrelation light appears on the rear focal plane P3 in real time at the position where the object to be identified is point-symmetric with respect to the measurement area of each shape. The shapes and positions of a plurality of objects to be identified can be determined simultaneously by the area where the autocorrelation light appears and the position in the area.
[0034]
Accordingly, the correlated light on the P3 plane is read out simultaneously in parallel by the two-dimensional light receiving array (two-dimensional optical information detection device) 20 that reads the intensity and position of the weak light simultaneously provided in parallel with the two-dimensional optical array or the like. If these signals are input to the identification result display 25 through the neuro processing device 24 and processed, the arrangement of character strings and the like can be instantly selected, the spatial distribution of a plurality of shapes by shape, the behavior by shape, etc. Are displayed instantaneously in parallel. The identification result display 25 has a microcomputer function and a data storage function, or the microcomputer 23 and the frame memory 22 are connected, and an algorithm for displaying the measurement result is mounted and processed.
[0035]
In addition, the members denoted by reference numerals 31 to 35 in FIG. 1 are a method and apparatus for optically performing all the neuro discrimination instead of receiving the correlated light group by the two-dimensional optical information processing apparatus 20 and performing the digital neuro discrimination. To express. In order to accurately identify a plurality of shapes, the correlated light group appearing on the rear focal plane P3 of the convex lens 19 is automatically determined by the optical neuro-identification feedback optical system. First, the optical components of the two-dimensional light receiving array 35 are installed in the measurement system from the polarization plane rotator 31. A reflection type polarization plane rotator 31 composed of a half-wave plate and a polarization mirror rotates and reflects the polarization plane of the correlated light group. The reflection type polarization plane rotator 31 includes a nonlinear optical system, and the intensity of the correlated light is reflected nonlinearly. An image in the same shape as the reference shape reproduced by the reflected correlated light group and at the same position as the identified object is reproduced, reflected by the polarizing mirror 32, and again irradiated with the hologram as object light. As a result, the autocorrelation light on the reflection type polarization rotator 31 is enhanced and corrected so that it can be easily distinguished from the intensity of the crosscorrelation light, reflected again, further reflected by the polarizing mirror 33, and condensed by the convex lens 34, and two-dimensionally received. On the array 35, each shape identification region appears at a position according to the position where the shape to be identified exists. Therefore, if these signals are displayed directly on the display or according to a special display program, the character string and the plurality of shapes are all discriminated in analog-neuro form in real time in parallel.
[0036]
The configuration and materials of other equipment used here are as follows. The plastic layer of the solvent vapor development type photoconductive plastic plate is a fully hydrogenated rosin, that is, an ester of rosin including a glycerin ester of disproportionated rosin.
[0037]
Next, the second embodiment according to the present invention will be described. The second embodiment constitutes a light transmission type spatial light modulator in place of the spatial modulator 9 and the small CRT image projection apparatus 10 in the first embodiment. It is characterized in that a liquid crystal display device is used.
FIG. 2 is a block diagram showing the features of the second embodiment, and, except for this feature, the same reference numerals as those of the first embodiment are made of the same members.
In the figure, 51 is a liquid crystal display device, and this liquid crystal display device 51 is arranged at the position shown in the figure in place of the spatial modulator 9 and the small CRT video projector 10 in the first embodiment. As shown in the drawing, the light that has passed through the semitransparent mirror 8 is reflected by the mirror 50, and the parallel light directly enters the mirror (M 1) 12. In the optical path between the mirror 50 and the mirror 12, the liquid crystal display device 51 and the polarized light are reflected. A plate (P) 11 enters. In this case, the position of the liquid crystal display device 51 is on the front focal plane of the convex lens (L1) 13 or in front of the polarizing plate (P) 11 within the front focal length, that is, on the light source side.
By configuring as described above, the spatial modulator 9 and the small CRT video projection device 10 in the first embodiment can be replaced with a liquid crystal display device.
By using the liquid crystal display device in this manner, a small CRT video projection device is not required, so that the manufacturing cost can be reduced and the structure can be simplified.
[0038]
In addition, the present invention can be implemented in any other form without departing from the spirit or main features thereof. Therefore, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner.
[0039]
【The invention's effect】
As explained in detail above, according to the present invention,
By using an optical analog calculation method using a multiple matched filter method that excels in parallel real-time identification, the shape and position of multiple objects to be identified can be simultaneously determined depending on the area where autocorrelation light appears and the position in that area. Can be identified.
In addition, a simple and quick automatic developing device is integrated with a laser light source and hologram creating optical system on a single rail-shaped optical bench to eliminate the influence of disturbance vibrations, and a hologram can be created in a bright place without the need for an optical darkroom. A group of identified shapes automatically created and taken from an electronic camera into the integrated hologram creation device is subjected to incoherent and coherent conversion with an image projection device and a spatial light modulator, and the hologram dry plate is subjected to real time of the identified shape groups. By making it possible to project information, it is possible to eliminate difficulties in hologram production technology.
In addition, the algorithm is created and loaded by placing a reference shape from an image captured from an electronic camera with a microcomputer, and irradiating the image onto the photoconductive plastic plate on the automatic hologram production device through a spatial light modulator. Creating a matched filter can simplify the preparatory work for mounting the algorithm.
By using a photoconductive plastic dry plate, it is possible to obtain a character string / plural shape identification device that does not require an optical darkroom. By installing the entire optical system on the optical rail, it is possible to obtain an excellent effect such as obtaining an integrated character string / multiple shape identification device having a high vibration isolation effect.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an identification device for character strings and plural shapes according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of an identification device for character strings and plural shapes according to another embodiment of the present invention.
[Explanation of symbols]
1 Optical rail
2 Laser light source
3 Light shutter
4 1/2 wave plate
5 Objective lens
6 Spatial light filter (SF)
7 Convex lens for creating parallel light (CL)
8 Half mirror
9 Spatial light modulator (SLM)
10 Small CRT video projector
11 Polarizing plate (P)
12 Mirror (M1)
13 Convex lens (L1)
14 Automatic hologram generator
15 Mirror (M2)
16 Neutral density filter and filter holder (FH)
17 Solvent evaporation supply device
18 High voltage supply device
19 Convex lens (L2)
20 Two-dimensional optical information processing equipment
21 Electronic camera (high-speed digital camera or high-speed analog camera)
22 frame memory
23 Computer
24 Optical neuro-processing equipment
25 Identification result display
31 Polarization plane rotator
32, 33 Polarizing mirror
34 Polarizer
35 Two-dimensional light receiving array
50 mirror
51 Liquid crystal display device

Claims (4)

Spatial light onto which a character string and a plurality of shapes are projected from a small CRT image projection device while irradiating a laser light source on one optical base, a hologram creating optical system having a half mirror, and transmitted light from the half mirror Incorporating a modulator, the small CRT video projection device that projects a character string, a plurality of shapes, etc. captured from an electronic camera to the spatial light modulator, and a hologram automatic creation device such as a photoconductive plastic, in the order described above, A multiple matched filter is created by the light from the laser light source and the character string projected from the CRT image projection device or a plurality of reference shapes, and the actual character string projected from the CRT image projection device, etc. Character string or multiple shape identification characterized by performing shape identification by projecting a group of shapes to be identified onto the multiple matched filter Location. 2. The spatial light modulator has a function of converting a character string or a plurality of shapes projected from the small CRT image projection apparatus into a coherent image by performing incoherent coherent conversion with a laser. A character string or a plurality of shapes of the identification device. 2. The liquid crystal display device replaces the small CRT video projection device that projects a character string, a plurality of shapes, and the like captured from an electronic camera onto the spatial light modulator. Or the character string of Claim 2, and the identification apparatus of multiple shapes. The identification device for character strings and plural shapes according to claim 1, wherein the shape identification is performed by a two-dimensional optical information processing device.

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