JP3323553B2 - Optical image output device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image output device used in the field of optical information processing, and more particularly to an optical image output device for accessing and outputting an image at high speed.

[0002]

2. Description of the Related Art Conventionally, as means for optically storing an image, a Fourier transform hologram is stored in a volume type hologram element, and multiple exposures are performed while gradually changing the direction of reference light for each image to be stored. By doing so, an image to be recorded and read is irradiated with a reference wave from the same direction as at the time of recording, and the image is reproduced by optically Fourier-transforming. However, in this method, a Fourier transform pattern, that is, a spatial frequency component of an image is recorded. In particular, a hologram element having extremely strong light at a low frequency and having a very large dynamic range is required. However, there was no such hologram element, and substantially many patterns could not be recorded. In addition, since the Fourier transform pattern is multiplexed and recorded, even if many images can be recorded, an image having the same frequency component at the time of reproduction is diffracted by interference fringes recorded as a volume hologram. Are emitted, and energy loss of reading light to an image other than the desired image occurs. Therefore, the signal itself drops,
And energy loss brings noise to the reproduced image,
It was practically difficult to store many images in memory, and the quality of reproduced images was poor.

Further, there is a method of electrically storing an image in a frame memory or an optical disk, and taking in an image as necessary. However, an optical disk requires a longer access time, and a frame memory has a larger capacity. Therefore, it is difficult to record many images. Further, when performing pattern recognition such as image recognition by performing matching between images, generally, a correlated method is used.
If you want to quickly extract various types of objects from a very large number of individual objects such as natural images, it is necessary to perform high-speed matching and record images of many types It is. However, the above-mentioned volume hologram method, in principle, corresponds to the use of extracting an object from an image having many objects but having the ability to match many images with one object. Can not do.

[0004] If the operation is performed electrically, the problem of the number of memories and the problem of the access time of each image are very large. However, the target object exists everywhere in the input plane like a natural image. If there is a possibility, the recorded image must be scanned for each recorded image to determine where the same one as the recorded image exists. It took an enormous amount of time and was difficult to achieve.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems. Therefore, a very large number of memory images can be obtained, and the quality of a reproduced signal is hardly degraded. It is another object of the present invention to provide an optical image output device capable of performing pattern matching with a desired image at high speed. It is a further object of the present invention to provide an optical image output apparatus which has high quality reproduced images without any crosstalk between images and low energy loss. Another object of the present invention is to provide an optical image output apparatus that can detect a correlation output position between a target image and a reference image at a very high speed and can switch a reference image at a high speed. I do.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned technical problems, and has at least a light source that emits at least a coherent substantially parallel light beam; Dividing the light beam into two, inclining the optical axes of each other by a desired angle; disposing a first lens on one of the optical axes; again, the light of the two light beams at the focal point of the first lens Light beam separating and condensing means for intersecting axes; first line scanning type beam deflecting means having a first rotation center at the condensing point; and a second having the first rotation center position as a front focal position. A third lens having a rear focal position at the rear focal position of the second lens; a first line scan having a second rotational center at the rear focal position of the third lens; Second line scanning type beam deflecting means for deflecting light in a direction orthogonal to the direction of deflection of the mold beam deflecting means; A first Fourier transform lens having a position of a second rotation center as a front focal position; a first image display device disposed in a focal plane of the first Fourier transform lens; and the first image display A second Fourier transform lens having the apparatus as a front focal position, a spatial light modulator disposed in a focal plane of the second Fourier transform lens, and means for reading a pattern on the spatial light modulator; A third Fourier transform lens for performing a Fourier transform on the light beam read by the read means; and an image capturing means arranged in a focal plane of the third Fourier transform lens; the first and second lines The scanning beam deflecting unit irradiates a desired image drawn on the first image display device with a substantially parallel light beam of the two light beams after passing through the first Fourier transform lens. By means Providing said optical image output apparatus characterized by.

The first image display device preferably uses a silver halide photosensitive material on which a desired image has been recorded, or a spatial light modulator. The image capturing means preferably uses a CCD camera. Further, it is preferable that the pattern readout means reads out with a coherent substantially parallel light beam. The pattern reading means has a pattern obtained by reading out the pattern displayed on the second image display device with a coherent light flux of a substantially parallel light flux and Fourier-transforming the transmitted or reflected light flux by a fourth Fourier transform lens. It is preferable to use a light beam for reading.

The image capturing means includes a third linear scanning beam deflecting means disposed between a third Fourier transform lens and a focal plane of the Fourier transform lens, and a focal plane of the Fourier transform lens. And a linear light-receiving element array arranged in a direction substantially perpendicular to the deflection direction of the third line scanning beam deflecting means. Preferably, the line scanning beam deflecting means uses a galvanomirror or an acousto-optic deflector.

[0009]

In the configuration of the optical image output apparatus of the present invention as described above, the substantially parallel light beam and the converged light intersect at a desired angle on the same optical axis by the light beam separating and condensing means.
When the first linear scanning beam deflector having a rotation center at the focal point of the converged light is used, the angle between the optical axis of the converged light and the substantially parallel light can be adjusted with respect to the first linear scanning beam deflector. Thus, the beam can be scanned in one direction in a two-dimensional plane while always being kept constant.

The pupil is transmitted to the position of the second line-scanning beam deflecting means by a pupil transmission optical system whose pupil is the rotation center position of the first line-scanning beam deflecting means. When the scanning direction of the second line-scanning beam deflecting means is perpendicular to the direction of deflection by the first line-scanning beam deflecting means, the angle formed by the optical axis of the focused light and the substantially parallel light becomes ,
After being emitted from the second line scanning beam deflecting means,
Whatever the direction of the first and second line scanning, the beam is always kept constant, and the beam can be scanned in a two-dimensional plane.

One of the two light beams that have passed through the second line-scanning beam deflecting means remains substantially parallel light, and the other becomes divergent light. After these two light beams pass through the first Fourier transform lens, the substantially parallel light beams are converged toward the focal point of the first Fourier transform lens, and the divergent light beams become substantially parallel light beams. Many images are recorded on the image display device arranged in the focal plane of the first Fourier transform lens, and a substantially parallel light beam reads a desired image. At this time, the desired image has been accessed by the beam deflecting means. The substantially parallel light beam from which the image information has been read and the converged light beam become a divergent light beam and are incident on the second Fourier transform lens.

The second Fourier transform lens has a function of performing a Fourier transform on a desired image read out using the substantially parallel light beam, and converting the divergent light beam into a substantially parallel light beam. This Fourier transform pattern is recorded on the spatial light modulator in the form of interference fringes using substantially parallel light beams as reference waves. As mentioned above, 2
Since the angle between the two beams remains constant, even if the beam is deflected to access the desired image,
The interval between the interference fringes drawn on the spatial modulator can always be constant. Therefore, the interference fringes are read out with a substantially parallel light beam and subjected to Fourier transform again by the third Fourier transform lens, so that a desired image can be output at the position of the ± 1st-order diffracted light. The output position of the image does not change because the interval between the read interference fringes is always constant. Therefore, the output image can always be output to a fixed location regardless of the pattern position on the accessed image display.

Further, an image containing a large number of objects, such as a natural image, is displayed on a second image display device, and this image is Fourier-transformed by a fourth Fourier transform lens, and is superimposed on the interference fringes. When the reflected light flux is again Fourier-transformed by the third lens, it means that the matched filter is substantially irradiated with the Fourier transform pattern of the target image, so that a correlation output with the target image (accessed image) is obtained. be able to. When this is received by a CCD camera or the like, stored in a frame memory, and analyzed by a computer, the location of the target image (accessed image) in the target image can be determined by the point of strong correlation output intensity. Can be identified by detecting as

Further, when this correlation output is given in a one-dimensional direction by a line scanning type beam deflecting means and the linear light receiving element array is arranged in a direction substantially orthogonal to this scanning direction, for example,
The correlation output position in the two-dimensional plane can be identified from the scanning point by the line scanning when the magnitude of each output of each light receiving element is larger than a certain value. The use of a galvanomirror for the line scanning beam deflecting means has the advantage that a good image with a small image distortion and a correlated output can be obtained. It has the advantage that images can be accessed. Also,
When the image display device uses a silver halide photosensitive material such as a photograph, the image display device cannot be rewritten, but has an advantage of recording many very high-resolution images. When used, there is an advantage that rewriting is easy.

The image capturing means may include a CCD.
Using a camera has the advantage that it is easier to electronically process the captured image or correlation output.

Next, the optical image output apparatus of the present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.

[0017]

Embodiment 1 FIG. 1 shows an optical image output apparatus 1 according to the present invention.
FIG. 2 is a configuration diagram illustrating a configuration of an example. The characteristic feature of the present invention is that a desired image is scanned in a direction perpendicular to the scanning direction of the first line scanning beam deflecting unit, the pupil transmission system, and the first line scanning beam deflecting unit. Having a second
Reading by a linear scanning beam deflecting means, and writing to a rewritable spatial light modulator as a Fourier transform hologram while always maintaining a reference wave and a Fourier transform pattern of a desired image at a constant angle, and reproducing the plane wave. Thus, a desired image is always reproduced at the same position. Hereinafter, this will be described in detail with reference to FIG.

In FIG. 1, an optical image output apparatus according to the present invention includes a light source unit 1, a light beam separating and condensing unit 2, a first line scanning type beam deflecting unit 3, and a pupil indicated by blocks (with frames). Transmission optical system 4, second line scanning beam deflecting means 5, first
, An image display device 7, a second Fourier transform lens 8, a spatial light modulator 9, a pattern readout unit 10, a third Fourier transform lens 11, and an image capturing unit 12.

In the light source section 1, light emitted from a light source 11 for generating coherent light such as a semiconductor laser is converted into a substantially parallel light beam by a collimator lens 12. In the light beam separating means 2, a substantially parallel light beam is split into two by a beam splitter 21, and one light beam A is reflected by a mirror 22 so as to be at an appropriate angle with the optical axis of the other light beam B. . The other light beam B is condensed by the lens 23, and both light beams A and B are condensed at the converging point of the lens 23.
Cross the optical axis of First line scanning beam deflecting means 3
In, the galvanomirror 31 is arranged so that the above-mentioned converging point and the rotation center of the galvanomirror 31 coincide. The galvanomirror 31 has the function of deflecting both light beams A and B into the plane of the drawing. Now, since the light flux B is converged by the lens 23, the galvanomirror 31
After being reflected by the luminous flux, the luminous flux A, which is a substantially parallel luminous flux, is emitted while maintaining a constant angle with the optical axis of the luminous flux B even when the galvanomirror 31 is scanned.

Next, the pupil transfer optical system 4 is an optical system that is located at a position conjugate with the rotation center of the galvanomirror 31 and the rotation center of the galvanomirror 51 of the second line scanning beam deflecting means 5. is there. In this optical system, a lens 41 having the rotation center of the galvanometer mirror 31 as a front focal position
Are arranged, the light beam B is a parallel light beam, and the light beam A is a focused light. Next, the rear focal plane of the lens 41 has a front focal point,
A lens 42 is provided in which the light beam B is again focused light and the light beam A is again a parallel light beam. With these lenses, the galvanomirror 31 and the galvanomirror 51 have a conjugate positional relationship. For this reason, in the second line scanning beam deflecting means 5, the galvanomirror 51 is arranged so that the rear focal position of the lens 42 and the center of rotation coincide with each other. In this galvanomirror 51, both light beams A and B are deflected in a plane orthogonal to the galvanomirror 31, that is, in a direction perpendicular to the paper surface. Therefore, even if the galvanomirror 31 and the galvanomirror 51 are deflected, the optical axes of the light flux A and the light flux B are reflected by the galvanomirror 51 while always maintaining a constant angle.

Next, in the first Fourier transform lens 6, since the galvanomirror 51 is disposed at the front focal position of the Fourier transform lens 61, the light beam A is transmitted at the rear focal position of the Fourier transform lens 61. Focusing is performed, and the light beam B becomes a substantially parallel light beam. In the image display device 7,
Many images having a size of about the beam diameter of the light beam B are displayed on the spatial light modulator 71, and the galvanomirror 31 and the galvanomirror 51 are swung by a desired angle, so that one of these images is Read with B. However, the spatial light modulator 71 may be a film on which many images are printed, or if it is desired to rewrite, a light-addressable ferroelectric liquid crystal light valve or an electric address-type spatial modulator such as a liquid crystal television. May be used.

In the second Fourier transform lens 8, the light beam B carrying the desired image information read out in this way is incident on the Fourier transform lens 81, and the desired image is subjected to Fourier transform. And at the same time, the luminous flux A
Are substantially parallel light beams, and the light beam A and the light beam B cross at the focal point of the Fourier transform lens 81 while maintaining a certain angle. That is, the light beam B becomes a Fourier transform pattern of a desired image, and the light beam A acts as a reference wave. Therefore, in the spatial light modulator 9, a Fourier transform hologram is formed by the two light beams A and B on the spatial light modulator 91 disposed at the rear focal position of the Fourier transform lens 81. In this Fourier transform hologram, the angle between the optical axes of the light beams A and B is constant regardless of how the galvanometer mirror 31 and the galvanometer mirror 51 are rotated in order to access a desired image on the image display device 71. Therefore, the interval between the interference fringes is always kept constant. Since the Fourier transform hologram is formed by a relatively angular reference wave, the spatial light modulator 91
High resolution ferroelectric liquid crystal light valve, BSO, L
iNbO ₃ or the like is desirable. The Fourier transform hologram written in this way is read by the pattern reading means 10.

Accordingly, in the pattern reading means 10, the light beam emitted from the laser 101 is converted into a substantially parallel light beam by the collimator lens 102 and transmitted through the beam splitter 103, and then the Fourier transform hologram is called. In the third Fourier transform lens 11, this light beam is reflected by the beam splitter 103 and enters the Fourier transform lens 111, so that it is again Fourier transformed and a desired image is output at the position of ± 1 dimensional diffracted light. . The image capturing means 12 reflects this image on a screen 121 and captures it on a CCD camera.

As described above, the image information recorded in the two-dimensional plane can always be output to the same output position, and can be compared with the one in which the volume hologram is recorded in the form of a Fourier transform hologram. Then 1
Since one image is always read, there is no crosstalk between the images, the reproduced image is of good quality, and energy loss is small. This is because, in the volume hologram, the Fourier transform hologram is multiplexed in the form of interference fringes, so even if it is desired to output a desired image, part of the energy of the reproduction light is consumed by an image having a similar spatial frequency. Then, a part of the image is reproduced. However,
This is because such an occurrence does not occur in the optical image output device of the present invention.

If a high-resolution image display device 7 such as a photographic film is used, an extremely large number of images can be recorded. For example, the scanning range of the galvanometer mirror is 5 cm × 5 cm, and one image is approximately 50
If it is represented by 0 × 500 dots, 0.5 mm × 0.5
One image can be represented by about mm. 1 μm
Assuming a resolution of one dot per ^two , about 10,000 images can be stored at this time.
When a galvanomirror is used as the linear scanning beam deflecting means, a high-quality image can be output because the reading speed is slightly reduced but the optical aberration is small. When an acousto-optic deflecting element is used, image quality is slightly deteriorated, but high-speed reading is possible. It is suitable for use in pattern recognition in which the quality of the image itself is not so important as described in the following embodiments. It goes without saying that the laser 101 and the collimator lens 102 may be shared with the light source unit of the light source unit 1.

[0026]

Embodiment 2 FIG. 2 is a configuration diagram showing the configuration of another embodiment of the optical image output device of the present invention. The feature of this embodiment is that a desired image is scanned in a direction orthogonal to the scanning direction of the first line scanning beam deflecting means, the pupil transmission system, and the first line scanning beam deflecting means. Read out by the second line scanning beam deflecting means having the above, the reference wave and the Fourier transform pattern of the desired reference image are always kept at a constant angle, and written to a rewritable spatial light modulator as a Fourier transform hologram, The Fourier transform pattern of an image in which many objects such as natural images exist is superimposed on the Fourier transform hologram, and the reflected or transmitted light beam is subjected to Fourier transform again, and is received by a CCD camera or the like. Is to identify where the image (accessed image) is in the target image by detecting it as a point having a strong correlation output intensity. Hereinafter, FIG. 2 will be described in detail.

In the optical image output apparatus shown in FIG. 2, the light source unit 1, the light beam separating and condensing means 2, the first line scanning beam deflecting means 3, and the pupil transmission optical system 4 are shown by blocks (with frames). A second linear scanning beam deflecting unit 5, a second Fourier transform lens 6, an image display device 7, a second Fourier transform lens 8, a spatial light modulator 9, a pattern reading unit 10,
Third Fourier transform lens 11 and image capturing means 1
2 is comprised.

The only difference from the first embodiment is the pattern reading means 10, so that the description of the other systems will be omitted. In the pattern reading unit 10 according to the second embodiment, after the light beam emitted from the laser 101 is converted into substantially parallel light by the collimator lens 102, an image in which many objects such as natural images captured by a CCD camera or the like are displayed. Is drawn on the image display device 104. This image display device 1
When writing is performed by an electric means such as a CCD camera, an electric address type spatial light modulator such as a liquid crystal television is generally used for the element 04, but an optical address type spatial light modulator can also be used. The image displayed in this manner is read out using a substantially parallel light beam, and subjected to Fourier transform by the Fourier transform lens 105. This Fourier-transformed pattern is created by Fourier-transforming a reference image and synthesizing it with a reference wave,
Irradiate a so-called matched filter drawn on the spatial light modulator 9.

Next, the light beam reflected by the spatial light modulator 9 is Fourier-transformed by the Fourier transform lens 111, so that the correlation output between the image drawn on the image display device 104 and the reference image is Fourier-transformed. It can be obtained on a screen 121 located at the rear focal plane of the lens. The reference output object is drawn on the image display device 104 by taking in the correlation output image on the screen 121 with a CCD camera or the like, storing it in a memory such as a collem memory, and analyzing a point having a strong correlation output intensity with a computer or the like. Where it exists in the displayed image. This correlation output is output in the direction of one-dimensional diffracted light corresponding to the correlation output, regardless of the reference image, and a combined output is obtained in the direction of the other one-dimensional diffracted light. The position specifies a specific point in the image drawn on the image display device 104, that is, a position where the object exists. This is because the interference fringe interval of the Fourier transform hologram drawn on the spatial light modulator 9 does not change even when the galvanomirror 31 and the galvanomirror 51 are scanned to call up the corresponding reference image.

As described above, in the present embodiment, the target object in the image can be recognized while switching the object at high speed by the line scanning type beam deflecting means. Can be adapted.
In addition, when compared with a volume hologram that is read in the form of a Fourier transform hologram, since one reference image is always read, there is no crosstalk between the reference images, and the reproduced image is of good quality. Low energy loss. This is because, in a volume hologram, if a Fourier transform hologram is multiplexed in the form of interference fringes, even if one wants to output a desired reference image, a part of the energy of the reproduction light is consumed by a reference image having a similar spatial frequency, This is because a part of the reference image is reproduced, but this does not occur in the optical image output device of the present invention. Therefore, it is possible to satisfactorily extract and recognize the target object in the image.

If a high-resolution image display device such as a photographic film is used as the image display device 7, an extremely large number of reference images can be recorded. When a galvanomirror is used as the line scanning beam deflecting means, the reading speed is slightly reduced, but the optical aberration is small, so that a good correlation output between the reference image and the target image can be obtained. In addition, when an acousto-optic deflector is used, the quality of the reference image slightly deteriorates and the quality of the correlation output slightly deteriorates.However, high-speed reading becomes possible, and the quality of the image itself is greatly reduced as in pattern recognition. It is sufficient for applications that do not matter. Note that the laser 101 and the collimator lens 102 can be shared by the light source unit 1 and the light source unit.

[0032]

[Embodiment 3] FIG. 3 is a configuration diagram showing the configuration of still another embodiment of the optical image output apparatus of the present invention. The feature of the present invention is that a desired image is scanned in a direction orthogonal to the scanning direction of the first line scanning beam deflecting means, the pupil transmission system, and the first line scanning beam deflecting means. Having a second
Read by the linear scanning beam deflecting means, and write in a rewritable spatial light modulator as a Fourier transform hologram while always keeping the Fourier transform pattern of the reference wave and the desired reference image at a constant angle, and many natural images. The Fourier transform pattern of the image in which the object is present is superimposed on the Fourier transform hologram, and the reflected or transmitted light flux is again Fourier transformed, and one-dimensionally converted by a linear scanning type deflecting means disposed in front of the Fourier transform surface. Swing in the direction,
By arranging the linear light-receiving element array in a direction substantially orthogonal to the scanning direction, the scanning point by the line scanning when the magnitude of each output of each linear light-receiving element is larger than a certain value is a two-dimensional plane. It is to identify the correlation output position at high speed. Hereinafter, this will be described in detail with reference to FIG.

In FIG. 3, an optical image output apparatus according to the present invention includes a light source unit 1, a light beam separating and condensing unit 2, a first line scanning type beam deflecting unit 3, and a pupil indicated by blocks (with frames). Transmission optical system 4, second line scanning beam deflecting means 5, second
, An image display device 7, a second Fourier transform lens 8, a spatial light modulator 9, a pattern readout unit 10, a third Fourier transform lens 11, and an image capturing unit 12.

The only difference from the second embodiment is the image capturing means 12, so that the description of the other systems overlapping with the second embodiment will be omitted. In the image capturing unit 12 of the third embodiment, the correlation output surface (the rear focal plane of the Fourier transform lens 111) between the image drawn on the image display device 104 and the reference image drawn on the image display device 71 and the Fourier A galvanometer mirror 122 that scans a light beam only in a one-dimensional direction is arranged between the conversion lens 111 and a linear sensor 123 in which light receiving elements are arranged in a direction substantially orthogonal to the scanning direction of the galvanometer mirror 122. Place on correlation output. The galvanomirror 122 may be arranged at any position as long as it covers the entire correlation output surface.

A method of obtaining a correlation output with the above-described configuration will be described below. First, when the galvanometer mirror 122 scans in a one-dimensional direction, an image of the correlation output surface cut at a width corresponding to the aperture of the light receiving element is applied to each light receiving element of the linear sensor 123 disposed on the correlation output surface. Is entered. Therefore, if the output from each light receiving element is monitored, a region having a high degree of correlation with the reference image can be detected. Then, the correlation output position corresponding to the image drawn on the image display device 104 can be determined from the position of the light receiving element and the angle at which the galvanometer mirror 122 is scanned. In this case, the image of the correlation output surface is captured by a CCD camera, recorded in a frame memory, and then the correlation output position can be determined at a much higher speed than when a strong correlation output position is determined by a computer or the like. it can.
Because the scanning speed of the galvanometer mirror 122 is 1K
Hz, and can be scanned in one-dimensional direction about 10 ³ times per second.

Therefore, the peak position can be detected at such a speed by thresholding the output from each light receiving element. Therefore, the detection speed of the correlation output can be remarkably increased as compared with the case where the data is stored in the light receiving frame memory by the CCD camera and is analyzed. Also, an acousto-optic deflector can be used in place of the galvanomirror 122. In this case, the processing speed can be further increased. The laser 101 and the collimator lens 102 are
It goes without saying that the light source unit of the light source unit 1 may be shared.

[0037]

As described above, the above-described effects are obtained by the optical image output apparatus of the present invention. Summarizing them has the following remarkable technical effects.
That is, first, an optical image output device in which the output position of the read image is always constant and the image can be accessed at high speed can be provided. Secondly, since one image is always read, there is no crosstalk between the images, and a high quality reproduced image and an optical image with little energy loss can be output. Third, the correlation output position between the target image and the reference image can be detected very quickly, and the reference image can be switched at a high speed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a configuration of an optical image output device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a configuration of another embodiment of the optical image output device of the present invention.

FIG. 3 is a configuration diagram showing a configuration of still another embodiment of the optical image output device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Light source part 2 Light beam separation condensing means 3 First line scanning beam deflecting means 4 Pupil transfer optical system 5 Second line scanning type beam deflecting means 6 First Fourier transform lens 7 Image display device 8 Second Fourier Conversion lens 9 Spatial light modulator 10 Pattern reading means 11 Third Fourier transformation lens 12 Image capturing means 11, 101 Laser 12, 102 Collimator lens 21, 103 Beam splitter 22 Mirror 23, 41, 42 Lens 31, 51, 122 Galvano Mirrors 61, 81, 105, 111 Fourier transform lenses 71, 104 Spatial light modulator 121 Screen 123 Linear sensor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-290173 (JP, A) JP-A-4-248527 (JP, A) JP-A-3-233433 (JP, A) JP-A-2- 244033 (JP, A) JP-A-2-143391 (JP, A) JP-A-61-288281 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02B 27/42 G02F 1 / 01 G06T 7/00 JICST file (JOIS)

Claims (7)

(57) [Claims] 1. A light source that emits at least a coherent substantially parallel light beam, a light beam emitted from the light source is split into two light beams, and the optical axes of the light beams are inclined by a desired angle. A first lens, a light beam separating and condensing means for intersecting the optical axes of the two light beams again at a light condensing point of the first lens, and a first light beam having a first rotation center at the light condensing point. A line scanning type beam deflecting means, a second lens having the first rotation center position as a front focal position, a third lens having a rear focal position at the rear focal position of the second lens, A second line-scanning beam deflecting unit having a second center of rotation at a rear focal position of the third lens and deflecting in a direction orthogonal to the deflection direction of the first line-scanning beam deflecting unit; A first Fourier transform lens having a position of the second rotation center as a front focal position; A first image display device disposed in a focal plane of the first Fourier transform lens, a second Fourier transform lens having the first image display device as a front focal position, and a second Fourier transform A spatial light modulator arranged in the focal plane of the lens, a unit for reading a pattern on the spatial light modulator, a third Fourier transform lens for performing a Fourier transform on the light beam read by the reading unit, The first and second line-scanning beam deflecting units are constituted by image capturing means arranged in the focal plane of a third Fourier transform lens, and the first Fourier transform lens of the two light beams A substantially parallel light beam having passed through the first image display device is irradiated on a desired image drawn on the first image display device, and the other light beam
Means for acting as illumination, wherein the means for reading out the pattern comprises:
The optical image output device, wherein the Fourier transform hologram formed on the spatial light modulator is read with substantially parallel light beams and subjected to Fourier transform again to output an image. 2. The apparatus according to claim 1, wherein the first image display device uses a silver halide photosensitive material on which a desired image is recorded, or
The optical image output device according to claim 1, wherein the optical image output device is a spatial light modulator. 3. The image capturing means according to claim 1, wherein said image capturing means is a CCD.
3. A camera using a camera.
3. The optical image output device according to 2. 4. The optical image output device according to claim 1, wherein said pattern reading means reads out by using a coherent substantially parallel light beam. 5. The pattern reading means according to claim 5,
The pattern displayed on the second image display device is read with a coherent light beam of a substantially parallel light beam, and the transmitted or reflected light beam is read with a light beam having a pattern subjected to Fourier transform by a fourth Fourier transform lens. Item 4. The optical image output device according to any one of Items 1 to 3. 6. The image capturing means includes: a third linear scanning beam deflecting means disposed between the third Fourier transform lens and a focal plane of the Fourier transform lens; and the Fourier transform lens. 6. A linear light-receiving element array which is arranged on a focal plane and is arranged in a direction substantially perpendicular to the direction of deflection of said third line-scanning beam deflecting means. The optical image output device as described in the above. 7. The linear scanning beam deflecting means,
The optical image output device according to any one of claims 1 to 6, wherein a galvano mirror or an acousto-optic deflector is used.