JPH11109840A - Method and device for recording picture information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reproduce a high-quality hologram picture having no distortion, blurring nor jaggy phenomenon by making a reproduced picture based on a recorded picture positioned in the vicinity of the picture recording reference surface of a recording medium and making the picture information of each element, to which viewing point conversion processing is performed, have continuity. SOLUTION: As for a hologram stereogram formed by performing viewing point conversion; the position of a viewing point is moved from a hologram surface 2a to an observer side by (dv) and the reproduced picture of the hologram recorded picture is also moved to the observer side by (dv) with the movement, so that it is positioned in the vicinity on the hologram surface 2a. Therefore, by observing the hologram stereogram at an observation distance (dv), the high-accuracy reproduced picture having no spatial distortion and little blurring is observed. In the case of picking up a parallactic picture row G1, a photographic parameter is set, so that parallax information between the respective sampling points of a picture for exposure is made continuous and the picture for exposure having no jaggy phenomenon is reconstituted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for recording image information, and more particularly to a holographic stereogram producing apparatus and a lenticular stereogram producing apparatus capable of three-dimensionally recognizing a photographed image, a computer-generated image and the like. The present invention relates to an image information recording method and an image information recording apparatus suitable for use in an apparatus or the like.

[0002]

2. Description of the Related Art Recording of image information and the like is generally performed in a two-dimensional manner for two-dimensional image information. For example, a three-dimensional effect can be obtained by adding a shadow or the like to an image. . As a technique for recording a stereoscopic image, for example, a holographic stereogram is known. The holographic stereogram is obtained by taking a large number of images (parallax image trains) obtained by sequentially capturing images of a subject from different observation points as original images, and forming these images on a single hologram recording medium in the form of strips or dots. It is created by sequentially recording as an element recording image.

A holographic stereogram identifies a two-dimensional image which is a set of image information of a part of each element recorded image when a user looks at the holographic stereogram from one position with one eye. When viewed at another position horizontally moved from the position, a two-dimensional image which is an aggregate of image information of another part of each element recording image is identified. Therefore, according to such a holographic stereogram,
When the user looks at the image with both eyes, the recorded image is recognized as a three-dimensional image due to the parallax between the left and right eyes.

In the holographic stereogram described above, for example, a laser beam emitted from a laser light source is divided into an object laser beam image-modulated based on each image of a parallax image sequence and a reference laser beam having coherence. It is created by a one-step holographic stereogram producing apparatus in which interference fringes generated by these object laser light and reference laser light are directly recorded on a recording medium as an element recording image. Such a one-step holographic stereogram producing apparatus can produce a high-accuracy holographic stereogram in a relatively short time.

[0005]

The holographic stereogram has a very high display efficiency because a three-dimensional hologram display image can be obtained as described above, and a holographic stereogram producing apparatus for easily producing the holographic stereogram. Is being developed. By the way, in the holographic stereogram for white light reproduction, a phenomenon occurs in which the reproduced hologram image is distorted or blurred as the observation viewpoint moves away from the hologram surface. This phenomenon is caused by the fact that the positional relationship between the photographing viewpoint and the subject when capturing the original parallax image sequence, that is, the photographing distance, is maintained as it is in the hologram image based on each elemental parallax image recorded on the hologram recording medium. This causes a shift from the observation viewpoint.

In the holographic stereogram producing apparatus, in order to solve such a problem, for example, each element parallax image information of the parallax image sequence information is replaced to correct the spatial distortion of the reproduced hologram image. Measures are taken to perform a viewpoint conversion process. In other words, this viewpoint conversion processing is performed so that the reproduced hologram image based on the image recorded on the hologram recording medium based on the element parallax image information is localized near the image recording reference plane (hologram plane). The process includes replacing image information as elemental parallax image information for generating a slit-shaped image in the parallax direction and reconstructing the image.

[0007] By the way, in the element parallax image based on the element parallax image information subjected to the viewpoint conversion processing, if the viewpoint position does not necessarily coincide with the viewpoint position of each element parallax image captured and supplied by the parallax image sequence imaging device. However, the one having the closest viewpoint is selected. For this reason, in the element parallax image based on the reconstructed element parallax image information, a discontinuous phenomenon (jaggy phenomenon) occurs, which causes a problem that the image quality of a recorded image is reduced.

Therefore, the present invention is applied to a holographic stereogram producing apparatus or the like which makes it possible to extremely easily produce a holographic stereogram that reproduces a high-quality hologram image without distortion, blurring or jagged phenomena. The present invention has been proposed for the purpose of providing a suitable method of recording image information and an image information recording device.

[0009]

According to the present invention, there is provided a method for recording image information, comprising: an object laser beam image-modulated based on each elemental parallax image of a parallax image sequence; On the other hand, a reference laser beam having coherence is incident on the recording medium, and interference fringes generated by the object laser beam and the reference laser beam are sequentially recorded on the recording medium as an element recording image. The parallax image sequence information based on the parallax image sequence is subjected to a viewpoint conversion process for reconstructing a parallax image for localizing a reproduced image based on the recorded image recorded on the recording medium near the image recording reference plane. Is done. Further, the parallax image sequence information is subjected to a parameter process for giving continuity to the reconstructed element image information in the parallax direction.

As the parameter, specifically, a viewpoint distance of a reproduced image based on a recorded image recorded on a recording medium is set. As a parameter, the parallax image sequence is photographed at a photographing distance equal to the viewpoint distance of the reproduced image of the recorded image recorded on the recording medium, and this photographing distance is set as a parameter.

According to the image information recording method of the present invention, the object laser beam and the reference laser beam image-modulated based on the element image information reconstructed by subjecting each element parallax image information to a viewpoint conversion process. A recording image is recorded on a recording medium by using interference fringes due to light as an element recording image. Since the reproduced image based on the recorded image is localized near the image recording reference plane of the recording medium, it constitutes a high-quality reproduced image without distortion or blurring without receiving the condition of the viewpoint distance. Further, according to the image information recording method, since the element image information subjected to the viewpoint conversion process has continuity with each other, each element recorded image is continuously recorded on the recording medium, and a jagged phenomenon occurs. A high-quality reproduced image without any image is obtained.

According to another aspect of the present invention, there is provided an image information recording apparatus comprising: a recording medium; and a parallax image sequence information based on a parallax image sequence captured by a parallax image sequence imaging device. And an object laser light image-modulated based on the displayed element parallax image and a reference laser having coherence with respect to the object laser light, the display including a display for displaying each element parallax image of the parallax image sequence A printer unit for sequentially recording interference fringes with light on a recording medium as an element recording image. The image information processing unit
A viewpoint configured to generate a parallax image for localizing a reproduced image of a recorded image recorded on a recording medium near an image recording reference plane with respect to elemental parallax image information of parallax image sequence information based on a parallax image sequence. A conversion process is performed, and a parameter process for giving continuity in the parallax direction to each element image information reconstructed based on the set parameters is performed.

As the parameter, specifically, a viewpoint distance of a reproduced image based on a recorded image recorded on a recording medium is set. As a parameter, the parallax image sequence is photographed at a photographing distance equal to the viewpoint distance of the reproduced image of the recorded image recorded on the recording medium, and this photographing distance is set as a parameter.

According to the image information recording apparatus of the present invention configured as described above, each elemental parallax image information is image-modulated based on the elementary image information reconstructed by performing a viewpoint conversion process. Since the interference fringes caused by the object laser light and the reference laser light are recorded on the recording medium as an element recording image, it is possible to create a recording medium that obtains a high-quality reproduced image without blurring without being affected by the viewpoint distance condition. It becomes possible. In addition, since the image information recording apparatus has continuity between the respective element image information subjected to the viewpoint conversion processing, each element recorded image is continuously recorded on a recording medium, and high-quality reproduction without a jagged phenomenon occurs. A recording medium for obtaining an image can be created.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. The holographic stereogram producing apparatus 10 shown as an embodiment, as will be described later, applies strip-shaped interference fringes of the object laser light L2 and the reference laser light L3 based on a large number of elemental parallax images to the hologram recording medium 1 as they are. A so-called one-step holographic stereogram 2 that is recorded to create a holographic recorded image 5 having a horizontal parallax.
It is a holographic stereogram producing device. As shown in FIG. 1, the holographic stereogram producing apparatus 10 includes an image information processing unit that processes parallax image sequence information D1 serving as source image information supplied from the parallax image sequence imaging device 3 and the image information generating computer 4. 11, a control unit 12, and a printer unit 13.

The holographic stereogram 2 is, as shown in FIG. 2, a parallax image sequence generating step S for generating a parallax image sequence G1 of the subject P by the parallax image sequence imaging device 3 or the like.
-1 and parallax image sequence information D based on the parallax image sequence G1.
1 is supplied to the holographic stereogram producing apparatus 10, and a parallax image sequence information supply step S-2 is performed. The parallax image sequence information D1 is subjected to predetermined image information processing to generate exposure image information D2. An information processing step S-3;
An image modulation step S-4 of performing light modulation of the laser beam L1 by the exposure display image G2 based on the exposure image information D2;
A hologram image recording step S-5 of exposing and recording a hologram recording image 5 on the hologram recording medium 1 by the laser beam L1 is created.

The parallax image sequence G1 is composed of m element parallax images g.
1 (g11,..., G1m). The disparity image sequence information D1 is configured by m pieces of element disparity image information d1 (d11,..., D1m) corresponding to the element disparity image g1. The exposure image G2 is composed of exposure image information D2.
N images for element exposure g2 (g1
, G1m), and the hologram recording image 5 is recorded by sequentially exposing and recording n element hologram recording images 5g (5g1,..., 5gn) on the hologram recording medium 1.

The hologram recording medium 1 has a structure shown in FIG.
As shown in FIG. 2, a photopolymer layer 7 made of a photopolymerizable photopolymer is formed on a tape-shaped film base material 6 and a cover sheet layer 8 is formed on the photopolymer layer 7 by applying a so-called so-called “photopolymer layer”. A coating type film recording medium is used. Of course, the hologram recording medium 1 includes
Other appropriate photosensitive films having different layer configurations may be used.

FIGS. 3B to 3D are views for explaining the principle of recording a hologram recording image 5 on the hologram recording medium 1. FIG. Holographic recording medium 1
In the initial state, the photopolymerizable photopolymer constituting the photopolymer layer 7 is, as shown in FIG.
The state is such that the monomers M are uniformly dispersed in the matrix polymer.

The photopolymerizable photopolymer is 10 mJ / cm
^By irradiating the laser beam LA with a power of ^{2 to} 400 mJ / cm ² , the monomer M uniformly dispersed in the matrix polymer in the exposed portion is polymerized as shown in FIG. It will be in the state of having done. In the photopolymerizable photopolymer, since the concentration of the monomer M becomes non-uniform due to movement from the periphery of the monomer M due to polymerization, the refractive index is modulated between the exposed portion and the unexposed portion.

As shown in FIG. 3D, the photopolymerizable photopolymer is thereafter irradiated with ultraviolet light or visible light LB having a power of about 1000 mJ / cm ² over the entire surface, so that a monomer M in the matrix polymer is formed. Is completed. In the hologram recording medium 1, since the photopolymerizable photopolymer constituting the photopolymer layer 7 changes its refractive index according to the incident laser light LA,
As described later, an interference fringe caused by interference between the object laser light L2 and the reference laser light L3 is recorded as a change in the refractive index.

The holographic stereogram producing apparatus 10 exposes the hologram recording image 5 by using the above-mentioned coating type film recording medium in which the photopolymer layer 7 is formed by the photopolymerizable photopolymer as the hologram recording medium 1. After recording, there is no need for a step of subjecting the hologram recording medium 1 to a special development process. Therefore, the holographic stereogram producing device 1
0 indicates that the development device and the like are not required, so that the configuration is simplified and the holographic stereogram 2 can be quickly created.

The image information processing section 11 of the holographic stereogram producing apparatus 10 includes a computer for image information processing and a storage device, although details are omitted. As described above, the image information processing unit 11 includes a captured image including a large number of pieces of parallax information captured by the parallax image sequence imaging device 3 and a large number of computer images including the pieces of parallax information generated by the image information generation computer 4. The parallax image sequence information D1 based on the parallax image sequence G1 composed of the above is supplied.
Note that the image information processing unit 11 may be supplied with two-dimensional image information created by an appropriate two-dimensional image information creating device.

As the parallax image sequence imaging device 3, for example, a multi-lens camera for simultaneously photographing the subject P or a mobile camera for continuously photographing is used, and a large number of elemental parallax images g including parallax information are used.
1 is generated. The parallax image sequence information D1 based on the parallax image sequence G1 is supplied to the image processing unit 11 as an NTSC video signal, for example, and is read as image information data. Therefore, as the parallax image sequence imaging device 3, a charge-coupled device (CCD
It is preferable to use an imaging device that directly outputs a captured image as electronic image information data, such as a CCD camera or a video camera using an element). Of course. The parallax image sequence imaging device 3 may be a camera using a photosensitive film. In this case, the captured image recorded on the photosensitive film is converted into electronic image information data via an image reading device or the like. Needless to say, it is necessary to do so.

The computer 4 for generating image information includes, for example, a CAD device (Computer Aided Des).
Ign) and CG equipment (Computer Graphi)
cs) is used to generate a plurality of pieces of image information including parallax information. As the two-dimensional image information creating device, for example, a word processor or a real creating device is used.
Character information that introduces the shooting date and time and place of the captured image or the content thereof, character information that describes the content of the computer image, and the like are generated.

The image information processing section 11 is used by a computer for image information processing to combine the above-described captured image, computer image, or parallax image sequence information D1 based on a two-dimensional image, and perform viewpoint conversion processing and parameter processing described later. The exposure image information D2 is generated by performing the image information processing of. The image information processing unit 11 temporarily stores the exposure image information D2 in a storage device such as a computer memory or a hard disk device. When exposing and recording the hologram recording image 5 on the hologram recording medium 1 as will be described later, the image information processing section 11 sends out the exposure image information D2 stored in the storage device to the printer section 13. In this case, the exposure image information D2 is sequentially read out corresponding to the element exposure image g2 for each image. Also,
As shown in FIG. 1, the image information processing section 11 responds to the reading of the exposure image information D2 by a timing signal S1.
To the control unit 12.

The control unit 12 includes a control computer, although details are omitted. The control unit 12 sends a control output S2 for controlling the operation to the printer unit 13 based on the timing signal S1 sent from the image information processing unit 11, as shown in FIG. The printer unit 13 includes an image g2 for each element exposure on the hologram recording medium 1 described later.
When the recording operation of each element hologram image 5g based on is completed, a timing signal S3 is sent to the control unit 12 as shown in FIG. The control unit 12 controls the timing signal S
Then, an output signal S4 is sent to the image information processing section 11 based on the signal No.3.

The image information processing section 11 outputs the output signal S4
, The exposure image information D2 for displaying the next element exposure image g2 from the exposure image information D2 is read out. By repeating this operation, the holographic stereogram producing apparatus 10 sequentially exposes and records n strip-shaped element hologram recording images 5g on the hologram recording medium 1 based on the respective element exposure images g2 in the parallax direction. A holographic stereogram 2 recording a hologram recording image 5 is created.

As shown in FIG. 4, the printer unit 13 splits the laser beam L1 emitted from the laser light source 16 into an object laser beam L2 and a reference laser beam L3, and outputs these object laser beams based on the element exposure image g2. Light L2 and reference laser light L
An optical system 14 for exposing and recording an interference fringe with the hologram recording medium 1 on the hologram recording medium 1 is provided. The printer unit 13 also stores an element hologram recorded image 5g based on the element exposure image g2.
Is provided with a recording medium feed mechanism 15 for intermittently moving the hologram recording medium 1 by a predetermined amount each time the hologram recording medium 1 is exposed and recorded on the hologram recording medium 1. The printer unit 1
3 is a structure in which the constituent members are mounted on a support substrate,
This support substrate is supported by a vibration-proof mechanism such as a damper. Further, since the printer unit 13 uses the hologram recording medium 1 made of a photosensitive film, the printer unit 13 includes an apparatus housing that configures at least the optical system 14 as a light shielding unit.

The optical system 14 includes an incident laser optical system 14A.
And the object laser optical system 14B and the reference laser optical system 14
C. The object laser optical system 14B and the reference laser optical system 14C have optical path lengths for increasing the coherence between the object laser light L2 and the reference laser light L3 to create a bright and high-quality holographic stereogram 2. They are configured to be almost the same.

The incident laser optical system 14A transmits the laser light L1
, A shutter mechanism 17, and optical components and mechanisms such as a total reflection mirror 18 for refracting and reflecting the laser beam L1 and a half mirror 19 for dispersing the laser beam L1. Of course, the incident laser optical system 1
4A, the laser beam L1 may be further appropriately refracted and reflected by interposing a reflection mirror or the like in order to form an appropriate optical path.

The laser light source 16 is, for example, a semiconductor-excited YAG that emits a laser beam L1 having a single wavelength and good coherence.
It is constituted by a laser device such as a laser device, an air-cooled argon gas laser device, or an air-cooled krypton laser device.
The laser light source 16 is provided with a heat sink mechanism (not shown) for appropriately cooling the laser head, which is heated to a high temperature. The shutter mechanism 17 is opened by a control output S2 output from the control unit 12 based on a timing signal S1 from the image information processing unit 11 transmitted in response to the reading of the exposure image information D2, and is opened. The laser light L1 output from the half mirror 19 is incident on the half mirror 19. The half mirror 19 converts the incident laser light L1 into
The object laser light L2 as a transmission component and the reference laser light L3 as a reflection component having coherence are separated into light and incident on the object laser optical system 14B and the reference laser optical system 14C, respectively.

The shutter mechanism 17 includes, for example, a pair of strip-shaped shutter pieces disposed just before the object laser beam L2 and the reference laser beam L3 are incident on the hologram recording medium 1. And a drive unit that integrally drives these shutter pieces. Such a shutter mechanism is in a state where the laser light is always incident on the optical system 14, so that the laser light source 16 is provided every time the element hologram image 5g is recorded.
In comparison with the above-described configuration of the shutter mechanism 17 in which the laser light L1 from the optical system 14 is incident on the optical system 14, there is a feature that thermal deformation of each constituent optical component is prevented.

Accordingly, the optical system 14 is provided with the shutter mechanism so that the constituent optical components are held in a stable state and the object laser beam L2 and the reference laser beam L3 in the stable state are recorded on the hologram recording medium 1. By making the light incident, the interference fringes in a good state can be exposed and recorded on the hologram recording medium 1. As a result, the holographic stereogram 5 to be created is one in which the recorded hologram recorded image 5 has excellent diffraction efficiency, is bright, and has improved image quality.

As for the shutter mechanism, not only the shutter piece is mechanically driven, but also, for example, an acousto-optic modulator (AOM).
and an electronic shutter using the same. The shutter mechanism is, in short, a laser beam L1 or an object laser beam L for the hologram recording medium 1.
2. Any openable and closable device that can block the reference laser beam L3 may be used.

The object laser optical system 14B is, specifically,
Arranged in order from the input side along the optical axis,
Total reflection mirror 20 and first cylindrical lens 21
And optical components such as a collimator lens 22 and a second cylindrical lens 23. The object laser optical system 14B has a collimator lens 22 and a second
The transmission type liquid crystal display 24 is disposed between the second cylindrical lens 23 and the hologram recording medium 1 at the emission end of the second cylindrical lens 23.

The total reflection mirror 20 refracts and reflects the object laser beam L 2 transmitted through the half mirror 19 and makes the object laser beam L 2 enter the first cylindrical lens 21. The first cylindrical lens 21 is a combination of a convex lens and a pinhole, and diffuses the object laser light L2 in one dimension as diffused light from a point light source corresponding to the screen surface width ls of the liquid crystal display 24. . The collimator lens 22 has a first
The object laser light L2 diffused by the cylindrical lens 21 is converted into a parallel laser light and incident on the liquid crystal display 24. The object laser light L2, when transmitting through the liquid crystal display 24, is image-modulated by a display image G2 displayed based on exposure image information D2 on which image information processing is performed, which will be described later, so that the second cylindrical lens 23
Is incident on.

The second cylindrical lens 23 converges the object laser light L2, which has been converted into a parallel laser beam and image-modulated, in the horizontal direction (parallax direction) as shown in FIG. 4B. The light is incident on the hologram recording medium 1.
The object laser beam L2 exposes a predetermined area of the hologram recording medium 1 in a strip shape based on each element exposure image g2, and sequentially exposes and records the element hologram recording image 5g.

The object laser optical system 14B is not limited to the configuration of the optical circuit described above. For example, a projection lens is disposed between the liquid crystal display 24 and the second cylindrical lens 23. Alternatively, the object laser beam L2 may be configured to be incident on the second cylindrical lens 23.

The object laser optical system 14B may be configured such that an optical filter and a mask member for removing noise components and improving the image quality of the holographic stereogram 2 are disposed in the optical path. The optical filter is formed of, for example, a light diffusion plate, and keeps the light intensity distribution of the object laser light L2 constant. The mask member is used to expose and record the element hologram image 5g on the hologram recording medium 1.
And the object laser beam L2 passing through the slit is made incident on the hologram recording medium 1. Object laser optical system 14B
By providing such a mask member, an extra portion of the object laser beam L2 diffused by the diffusion plate is shielded so that a holographic stereogram 2 on which a high-quality hologram recording image 5 is recorded is created. I do.

Further, the object laser optical system 14B may be configured by disposing a primary diffusion plate and a louver film in the optical path in order to give the holographic stereogram 2 a vertical viewing angle. Good. The primary diffusion plate acts to diffuse the object laser beam L2 in the major axis direction of the element hologram recording image 5g to be exposed and recorded on the hologram recording medium 1 to provide a vertical viewing angle. The louver film is composed of a film having a fine grid-like lattice provided between the primary diffusion plate and the hologram recording medium 1,
The reference laser beam L3 transmitted through the hologram recording medium 1 acts to prevent the reference laser beam L3 from being reflected by the primary diffusion plate and incident on the hologram recording medium 1 again.

The liquid crystal display 24 has an element exposure image g2 for exposing and recording one element hologram recording image 5g based on the exposure image information D2 sent from the image information processing section 11 as described above. Are sequentially displayed. The liquid crystal display 24 modulates the transmitted object laser light L2 based on the displayed element exposure images g2.

The reference laser optical system 14C is, specifically,
A cylindrical lens 25, a collimator lens 26, and a collimator lens 26, which are respectively arranged in order from the input side along the optical axis;
And a total reflection mirror 27. Of course, the reference laser optical system 14C is not limited to the above-described optical components. For example, optical components such as a reflection mirror are appropriately arranged in the optical path in order to match the optical path length with the object laser optical system 14B. You may comprise.

The cylindrical lens 25 is the first cylindrical lens 2 of the object laser optical system 14B.
As in the case of 1, a convex lens and a pinhole are combined, and the reference laser beam L3 refracted and split by the half mirror 19 is converted into a primary light as a diffused light from a point light source corresponding to the screen surface width ls of the liquid crystal display 24. Spread in the original direction. The collimator lens 26 is a cylindrical lens 2
The reference laser beam L3 diffused by 5 is converted into a parallel laser beam. The total reflection mirror 27 refracts and reflects the reference laser beam L3 and guides the reference laser beam L3 to the rear of the hologram recording medium 1 facing the incident position of the object laser beam L2.

In the optical system 14 configured as described above, the shutter mechanism 17 is opened by the control output S2 supplied from the control unit 12 in response to the reading of the exposure image information D2, and the laser light source 16 emits light. Laser light L1
Is incident on the incident laser optical system 14A. Laser light L1
Is refracted and reflected by the total reflection mirror 18 and is incident on the half mirror 19, whereby the light is split into the object laser light L2 and the reference laser light L3.

The object laser light L2 is emitted from the object laser optical system 1
In 4B, the image is modulated by the element exposure image g2 displayed based on the exposure image information D2, and is incident on the hologram recording medium 1. The reference laser beam L3 is incident on the hologram recording medium 1 via the reference laser optical system 14C. The object laser light L2 and the reference laser light L3 interfere with each other on the hologram recording medium 1, and
The interference fringes generated by this interference are recorded on the photopolymer layer 7 by exposure as a change in the refractive index. Therefore, on the hologram recording medium 1, a hologram recording image formed by sequentially exposing and recording an element hologram recording image 5g composed of interference fringes of the object laser beam L2 and the reference laser beam L3 based on the element exposure image g2 in the parallax direction. 5 is recorded.

When the hologram recording medium 1 is subjected to exposure recording of the element hologram recording image 5g, the recording medium feeding mechanism 15 operated by the control output S2 sent from the control section 12 causes the recording of the one element hologram recording image 5g. It is only intermittently sent. As shown in FIG. 5, the recording medium feeding mechanism 15 is rotatably provided in the film cartridge 28 and has a supply roller 29 around which the hologram recording medium 1 is wound, and a hologram recording medium unwound from the film cartridge 28. The hologram recording medium 1 includes a driving roller 30 that intermittently travels, a torsion spring (not shown) that applies a predetermined traveling tension to the hologram recording medium 1, and the like.

The recording medium feed mechanism 15 includes a supply roller 29
And the drive roller 30, the photosensitive surface (hologram surface) 2a of the hologram recording medium 1 is moved to the object laser optical system 14B.
And the reference laser optical system 14C. Also, a recording medium feeding mechanism 1
Reference numeral 5 indicates that the driving roller 30 is intermittently driven to rotate by a driving stepping motor (not shown). The stepping motor is driven to rotate by a predetermined angle every time the exposure for 5 g of the one-element hologram recorded image is completed by the control output S2 sent from the control unit 12. Therefore, the hologram recording medium 1 is intermittently driven by the stepping motor through the driving roller 30 for each exposure recording of the one-element hologram recording image 5g, so that the hologram recording medium 1 is referred to as the object laser beam L2. The element hologram recording image 5g due to the interference fringe with the laser beam L3 is sequentially exposed and recorded in the parallax direction.

As shown in FIG. 5, the holographic stereogram producing device 10 is provided with an ultraviolet ray irradiating device 31 located at the subsequent stage of the recording medium feeding mechanism 15 along the running path of the hologram recording medium 1. ing. The ultraviolet irradiation device 31 applies 1000 mJ / cm ² to the hologram recording medium 1 on which the hologram recording image 5 has been exposed and recorded by interference fringes between the object laser beam L2 and the reference laser beam L3.
The polymerization of the monomer M in the matrix polymer of the photopolymer layer 7 is completed as described above by irradiating the ultraviolet light LB with a moderate power.

The holographic stereogram producing device 10 includes a heat roller 32 provided with a heater 33 inside the hologram recording medium 1 along a traveling path of the hologram recording medium 1, which is located at a stage subsequent to the ultraviolet irradiation device 31. A pair of discharge feed rollers 34 and a cutter mechanism 35 are sequentially arranged. The heat roller 32 runs with the hologram recording medium 1 wound around the outer peripheral portion thereof at a winding angle of about half a circumference. The heat roller 32 is maintained at a temperature of about 120 ° C. by the heater 33,
The hologram recording medium 1 is heated to increase the degree of refractive index modulation of the photopolymer layer 7.

The discharge feed roller 34 is driven to rotate in synchronization with the drive roller 30 of the recording medium feed mechanism 15 by the control output S2 sent from the control unit 12. The discharge feed roller 34 is used for the hologram recording medium 1.
Is intermittently sent out for each exposure recording of the one-element hologram recording image 5g. Therefore, the hologram recording medium 1 is
Uniform heating is performed by running between the discharge feed roller 34 and the drive roller 30 in a state in which the drive roller 30 is in close contact with the outer peripheral portion of the heat roller 32 without bending.

The cutter mechanism 35 is driven by a control output S2 sent from the control unit 12, and moves the running hologram recording medium 1 to a fixed length, that is, all the element hologram recording images 5g are recorded on the hologram recording medium 1 in parallax. The holographic recording image 5 arranged in the direction is exposed and recorded, and the holographic stereogram 2 is created by cutting the recording portion in a state where it is discharged to the outside.

Note that the recording medium feeding mechanism 15
The rollers are not limited to the supply roller 29, the drive roller 30, and the discharge feed roller 34. As the recording medium feed mechanism 15, for example, a feed mechanism including a sprocket that forms perforations on a film body at a constant pitch and has a feed claw that relatively engages with the perforations, a lever that intermittently swings, A conventionally well-known film body feeding mechanism including a feeding mechanism may be appropriately employed.

The hologram recording medium 1 vibrates when it is intermittently driven by the recording medium feeding mechanism 15. The vibration of the hologram recording medium 1 causes the interference fringes of the object laser beam L2 and the reference laser beam L3 to be in an unstable state, thereby lowering the diffraction efficiency and image quality of the hologram recording image 5 exposed and recorded on the holographic stereogram 2. Let it. Therefore, in the holographic stereogram producing apparatus 10, the recording operation of the above-described element hologram recording image 5 g is performed in a state where the vibration has subsided a little after the driving of the hologram recording medium 1. Necessary control is performed in the control unit 12.

The holographic stereogram producing apparatus 10 uses the above-described primary diffusion plate and louver film to suppress the vibration of the hologram recording medium 1, and attaches these members to the hologram recording medium 1. You may comprise so that it may press. Of course, as the vibration suppressing mechanism, an appropriate mechanism such as providing a tension roller that does not affect the running operation of the hologram recording medium 1 or holding and holding the hologram recording medium 1 by a pair of rollers or the like is used. May be configured.

In the holographic stereogram producing apparatus 10, when a holographic stereogram 2 in a good state is not produced due to vibration or the like (not shown), an element hologram recorded image on the holographic recording medium 1 is generated. An interference fringe detection unit for stopping exposure recording of 5 g may be provided. The interference fringe detection unit is configured by, for example, a CCD camera, and detects the state of interference fringes formed by exposure in a detection area different from the formation area of the element hologram recording image 5g of the hologram recording medium 1. The interference fringe detection unit sends a detection output to the control unit 12 when detecting the appearance of an interference fringe having a fluctuation state of a predetermined value or more in the detection area. The control unit 12 sends a control output for stopping the recording operation of the element hologram recording image 5g to the hologram recording medium 1 to the printer unit 13 based on the detection output.

The holographic stereogram producing apparatus 10 is provided with such an interference fringe detecting section, so that the interference fringes due to the object laser beam L2 and the reference laser beam L3 can be exposed and recorded on the hologram recording medium 1 in a stable state. Holographic stereogram 2 with high diffraction efficiency and high image quality is created. The interference fringe detector is
For example, a configuration may be used in which a part of the object laser light L2 and the reference laser light L3 is guided to another position using a mirror or the like to form interference fringes, and the interference fringes are detected. Further, the interference fringe detection unit may be configured to form an interference fringe using detection laser light obtained by dispersing the object laser light L2 and the reference laser light L3 using a half mirror or the like, and to detect the interference fringe. . Further, the interference fringe detection unit may be configured to directly extract a part of the laser light L1 emitted from the laser light source 16, form an interference fringe for vibration detection, and detect the interference fringe.

As described above, in the holographic stereogram producing apparatus 10, the image information processing section 11 includes a parallax image sequence based on the parallax image sequence G1 generated by the parallax image sequence imaging device 3 and the image information generating computer 4. Information D1 is provided. The holographic stereogram producing device 10 is supplied with two-dimensional image information produced by the two-dimensional image information producing device as needed.

For example, as shown in FIG. 6, the parallax image sequence G1 is mounted while holding the subject P in a fixed state, and the CCD camera (parallax image sequence imaging device) 3
A shooting method in which images are sequentially taken at an angle of view θc while moving in parallel, so-called “straight trace”.
It is created by the k imaging method. In this case, the CCD camera 3 is moved within a range of a moving distance (parallax image photographing width) lc enough to cover the width le of the holographic stereogram 2 in the finder, and at equal intervals (Δlc) in the moving direction. Shift the position to 500 or more subjects P
Take about 000 shots. These captured images correspond to the subject P
The parallax image sequence information D1 is configured as a parallax image sequence G1 having parallax in the horizontal direction.

As a method of imaging the parallax image sequence G1, as shown in FIG. 7, the image is taken while the CCD camera 3 is moved in parallel with the subject P, and the objective lens PL is tilted for each shooting position. There is also known a so-called re-centering method in which an image of an object P focused by performing an operation is focused on the center of a finder. In the re-centering imaging method, it is not necessary to make the camera angle of view θc coincide with the exposure angle of the element hologram recorded image 5g by the cylindrical lens 23 of the optical system 14, and the subject P can be photographed at a relatively small angle of view. It can be performed efficiently. And such re-c
The entering imaging method is characterized in that there is no influence of image distortion generated when photographing using a wide-angle lens, and that the effective resolution in the parallax direction of a photographed image can be increased.

Incidentally, in the holographic stereogram 2 for reproducing white light produced by the holographic stereogram producing apparatus 10 described above, the reproduced image 40 of the hologram recorded image 5 increases as the observation viewpoint moves away from the hologram surface 2a. Is gradually distorted. The holographic stereogram 2 for white light reproduction has less blur as the reproduced image 40 is localized near the hologram surface 2a. The above-described distortion phenomenon is caused by the fact that the positional relationship between the photographing viewpoint of the parallax image sequence imaging device 3 and the subject P when photographing the parallax image sequence G1, that is, the photographic distance df created by the holographic stereogram producing device 10. Since the reproduction image 40 of the stereogram 2 is also maintained,
This is due to a shift between the observation viewpoint and the viewpoint at the time of shooting.

That is, in the holographic stereogram 2, the parallax image sequence information D1 based on the parallax image sequence G1 is supplied as it is to the printer unit 13 as exposure image information D2 without performing a viewpoint conversion process described later, and is used for exposure. When an image G2 is generated and created by exposing and recording the hologram recording image 5 on the hologram recording medium 1 based on the exposure image G2, as shown in FIG. The reproduced image 40 is in a state of being imaged at a depth position shifted by the shooting distance df. Accordingly, in order to obtain a good reproduction image 40 without distortion and blurring in the reproduction image 40, the holographic stereogram 2 is focused on the hologram surface 2a as shown in FIG. Must be used in a state where the shooting distance df of the parallax image sequence G1 is matched, which is not practical.

In the holographic stereogram producing apparatus 10, when the image information processing section 11 performs image information processing of the parallax image sequence information D1 based on the parallax image sequence G1, the reproduced image 40 is converted into a hologram of the holographic stereogram 2. The image information D2 for exposure is generated by performing a viewpoint conversion process for localizing the image in the vicinity of the surface 2a. The holographic stereogram 2 is composed of an object laser beam L2 and a reference laser beam L3 image-modulated by the exposure image G2 displayed on the liquid crystal display 24 based on the exposure image information D2 subjected to the viewpoint conversion processing. As a result, the hologram recording image 5 is exposed and recorded on the hologram recording medium 1.

In the holographic stereogram 2, as shown in FIG. 8B, the reproduced image 40 is localized near the hologram surface 2a. Therefore, the holographic stereogram 2 reproduces a clear reproduced image 40 without distortion or blur as shown in FIG. 4 without the user observing the hologram surface 2a with eyes as described above. .

FIGS. 9 and 10 show the above-described re-cen.
FIG. 9 is a diagram illustrating the principle of viewpoint conversion processing for reconstructing image information for exposure D2 from parallax image sequence information D1 based on a parallax image sequence G1 composed of m element parallax image sequences g1 created by a tering imaging method. Exposure image information D2
Is an exposure image G2 composed of n element exposure images g2.
Is generated and displayed on the liquid crystal display 24. The holographic stereogram producing apparatus 10 includes the image information processing computer as described above, and sequentially displays the element exposure images g2 on the liquid crystal display 24 based on the exposure image information D2 subjected to the viewpoint conversion processing. The element hologram recording image 5g is recorded on the hologram recording medium 1.

FIG. 9 shows the holographic surface 2a of the holographic stereogram 2 having a length of le in the parallax direction (horizontal direction) at each exposure point ep (ep1,..., Epn) at each element hologram recording image 5g. FIG. 6 is a diagram for explaining a positional relationship between each element exposure image g2 of the exposure image G2 for exposure recording and each element parallax image sequence g1 of the parallax image sequence G1. At each exposure point ep, the element exposure image g2 is exposed at an exposure angle θe from the viewpoint distance dv. For each of the exposure points ep, three of ep1, ep2 and epn are used for convenience of explanation.
Only the points are shown. Of course, the number of the exposure points ep varies depending on the specification of the horizontal size le of the holographic stereogram 2 and the expression accuracy of the hologram recorded image 5, but for example, at an equal pitch of 0.2 mm, n = 50.
It is assumed that about 0 exists.

The pitch Δle of each exposure point ep is equal to the pitch of each element exposure image g2, and the length of the holographic stereogram 2 in the horizontal direction is: le = n × Δle (1) Become.

In the figure, lc is the shooting width of the parallax image sequence G1 composed of m element parallax images g1, dv is the viewpoint distance, and df is the shooting distance of the parallax image sequence G1. The pitch Δle of each exposure point ep and each element parallax image g1
Are not necessarily equal. Viewpoint distance d
v is equal to the shooting distance df. At each exposure point ep of the holographic stereogram 2, each element exposure image g2 sequentially displayed on the liquid crystal display 24 is exposed and recorded at an exposure angle θe. Each element exposure image g2 is
For example, the resolution is configured to have an image size of 640 (pixels) vertically and 480 (pixels) horizontally (parallax direction).

In the viewpoint conversion process, image information for reconstructing new exposure image information D2 for generating n element exposure images g2 by replacing the m element parallax image information d1 of the parallax image sequence G1. Processing. In the viewpoint conversion process, the replacement of the element parallax image information d1 is performed using the minimum unit, that is, a slit-shaped element image of 640 (pixels) vertically and 1 (pixel) horizontally. The element image information is taken out and the height is 640 (pixel),
An element exposure image g2 having an image size of 480 (pixels) in the horizontal direction (parallax direction) is configured.

The viewpoint conversion process will be described in more detail with reference to FIG. FIG. 11 is a diagram showing a state in which one element exposure image g21 in FIG. 9 is taken out and the image is reconstructed. The element exposure image g21 has a viewpoint distance d
sampling points mp11, mp12, ..., m on v
The image information in each of p1k is reconstructed by performing arithmetic processing on which element parallax image information d1 based on which element parallax image g1 in the captured parallax image sequence G1 is mapped.

At the time of mapping, the exposure point ep1 and the sampling points mp11, mp1 of the image g21 for exposure are used.
Consider a straight line (mapping line ml) connecting 2, 2,..., Mp1k. The parallax image is a parallax image sequence G1.
, The point at which this mapping line ml intersects the plane DV at the viewpoint distance dv, that is, mp11, mp12,.
, Mp1k, the one having the closest viewpoint is selected. Note that, for convenience of explanation, the viewpoint of the parallax image sequence G1 and the sampling points are all shown to be coincident with each other, but the setting of the imaging parameters of the parallax image sequence G1 and the parameters related to the holographic stereogram 2 to be created are shown in FIG. Of course, they do not always match depending on the setting of. The number of samples (pixels) in the parallax direction is
As described above, the image for exposure g21 is vertically 640 (pixe
l), since it has an image size of 480 (pixels) horizontally, it is 480, and k = 480.

As the sampling point mp11, the parallax image having the closest viewpoint, that is, the element parallax image g11 having the viewpoint mp11 is selected, and the exposure point ep1 and the element parallax image g are selected.
When the mapping line ml1 (shown by a bold line in the figure) connecting the eleven viewpoints mp11 is extended in the direction of the screen of the elemental parallax image g11, the screen surface DS at the shooting distance df.
640 (pixel) existing at the point op1j where
(Pixel) disparity information is extracted and mapped to mp11. Here, op represents a sampling point of the captured parallax image sequence G1, and each of the parallax images has j sampling points. For example, in the element parallax image g11, op11, op12,.
Sampling points exist. Each element parallax image g1 is
Since the image is captured with an image size of 640 (pixels) vertically and 480 (pixels) horizontally, j = 480.

In the viewpoint conversion process, one new exposure image g21 is reconstructed from the parallax image sequence G1 by performing the above-described image information processing on the other sampling points mp12,..., Mp1k. . The viewpoint conversion process further performs the same image information processing as the other exposure points ep12, ep12,
, Ep1j, the exposure images g22, g23,... At the respective exposure points ep.
, G2n are sequentially reconstructed. The reconstructed image sequence G2 for exposure is sequentially displayed on the liquid crystal display 24, and the object laser light L2 transmitted therethrough interferes with the reference laser light L3 to record the slit-shaped element hologram on the hologram recording medium 1. Exposure recording is sequentially performed as an image 5g.

In the hologram stereogram 2 created by performing the above-described viewpoint conversion, the viewpoint position moves by dv from the hologram surface 2a toward the observer, and the reproduced image 40 of the hologram recorded image 5 also moves by dv. As a result of moving to the observer side, it is localized near the hologram surface 2a as shown in FIG. Therefore, by observing the hologram stereogram 2 at the observation distance dv, a high-precision reproduced image 40 with no spatial distortion and little blur is observed.

By the way, in this viewpoint conversion processing,
When the viewpoint of the parallax image sequence G1 captured on the mapping line ml connecting the exposure point ep of the hologram recording image 5 and the sampling point mp of the exposure image G2 does not exist, the parallax image existing on the sampling plane DV. A parallax image having a viewpoint closest to the sampling point mp of the exposure image G2 is selected from the viewpoints in the column G1, and mapping processing is performed. In such a case, the parallax information mapped to each sampling point mp of the exposure image G2 becomes discontinuous, and a jagged phenomenon occurs.

The holographic stereogram producing apparatus 10 solves the above-mentioned problem by setting a photographing parameter at the time of capturing the parallax image sequence G1 so that the parallax between the sampling points mp of the exposure image G2 is set. The exposure image G2 having no jaggy phenomenon is reconstructed as continuous information.

Next, a method for setting these parameters will be described. The parameters fixed by the optical system 14 are:
As is apparent from FIG. 9, the exposure angle θe matched with the angle of view of the cylindrical lens 23 and the exposure pitch (the pitch of the element hologram recorded image 5g) Δle. The screen width ls of the liquid crystal display 24 is calculated by: ls = 2dv × (tan θe / 2) (2) Note that dv is the viewpoint distance from the hologram surface 2a as described above, and the parallax image sequence G1
Is equal to the shooting distance df. Sampling pitch of element exposure image g2 is, Δls = ls / (n _x-1) Equation 3, however, n _x is the parallax direction (x-direction) of the exposure image g2
Is calculated by the number of pixels of

Here, the sampling pitch Δls of the exposure image g2 and the exposure pitch (element hologram recorded image 5g
Δls = wΔle (where w is a natural number) satisfies the condition of Expression 4, and at this time, the photographing pitch Δlc of the parallax image sequence G1 is Δlc = Δle... Then, the viewpoints of the parallax image sequence G1 exist on all the mapping lines ml described above, and the parallax information becomes continuous in the exposure image G2 reconstructed by the viewpoint conversion process, so that the jaggy phenomenon can be eliminated. .

As the photographing parameters of the parallax image sequence G1 satisfying the above-mentioned conditions, only the photographing distance df (= observation distance dv) of the parallax image sequence G1 is a parameter having a relatively high degree of freedom. Therefore, the observation distance d
v is calculated. Hereinafter, an example of the parameter calculation will be described.

For example, the horizontal width is 96.0 mm, the pitch of the element hologram recorded image 5 g is 0.2 mm, and the angle of view is 49.
To create a 5 ° hologram stereogram 2,
Le = 96.0 mm, Δle = 0.2 mm, θ
e = 49.5 °. At this time, in Expression 4, if n = 3, for example, Δls = 0.6. Therefore, assuming that the number of pixels nx in the parallax direction of the image g2 for element exposure is 480, the screen width is calculated by Expression 3, and ls =
287.4. The observation distance dv at this time, that is, the imaging distance df of the parallax image sequence G1 is calculated by Expression 2, and df = dv = 311.71.

The holographic stereogram producing apparatus 10 is supplied with a parallax image sequence G1 imaged based on the photographing parameters set as described above, and the image information processing unit 11 generates a parallax image sequence based on the parallax image sequence G1. By performing a viewpoint conversion process on the information D1, an exposure image G2 without jaggies is reconstructed. The holographic stereogram producing apparatus 10 image-modulates the object laser light L2 with the exposure image G2, and also converts the hologram recording image 5 with the object laser light L2 and the reference laser light L3.
To record a hologram stereogram 2. Therefore, the hologram stereogram 2 reproduces a reproduced image 40 of good image quality without spatial distortion or blur and without jaggies.

The viewpoint conversion process for reconstructing the exposure image G2 from the parallax image sequence G1 is a process of replacing the elemental parallax image g1 of the parallax image sequence G1 and reconstructing a new exposure image G2. However, if the parameters are the same, the permutation order is the same even for different parallax image sequences obtained by imaging another subject P. Therefore, the viewpoint conversion process prepares data in which the order of replacement of the elemental parallax images is recorded under the same condition as the shooting distance df which is equal to the viewpoint distance dv which is a parameter of the target parallax image sequence, and The processing may be performed with reference to the processing.

That is, in the viewpoint conversion processing, the first time, the elementary parallax image g1 of the parallax image sequence G1 is subjected to the viewpoint conversion process by the above-described method to reconstruct the exposure image G2, and the parallax information of the parallax image sequence G1 is obtained. And the parallax information of the display image for exposure G2. The correspondence is stored in an external storage device such as a hard disk drive or a memory device, and is called up at the time of the next and subsequent viewpoint conversion processes. The holographic stereogram producing apparatus 10 does not need the viewpoint conversion process of repeating the above-described search and calculation for each parallax image sequence G1, and can greatly reduce the processing speed.

The holographic stereogram 2 corrects the viewpoint position information by the above-described viewpoint conversion processing for the parallax in the horizontal direction, and retains the information at the time of shooting the parallax image sequence G1 in the vertical direction. .
The holographic stereogram 2 is observed while moving the viewpoint in the horizontal direction with respect to the hologram surface 2a in the same manner as the viewpoint movement in which the subject P is continuously photographed while the parallax image sequence imaging device 3 is moved in the horizontal direction. As a result, the reproduced image 40 of the subject P is reproduced without distortion near the hologram surface 2a.

The above-described holographic stereogram producing apparatus 10 is an apparatus for exposing and recording an elementary hologram image on the hologram recording medium 1 in monochrome, but the present invention is not limited to such a holographic stereogram producing apparatus. Absent. The holographic stereogram producing apparatus includes, for example, laser light sources of three primary colors of red, green, and blue, and each optical system and a liquid crystal display device corresponding to these laser light sources, thereby synthesizing the holographic recording medium 1. An apparatus for exposing and recording the obtained element hologram image in color may be used.

[0086] The holographic stereogram producing apparatus 10 also includes a holographic stereogram (so-called Horizonta) having only parallax information in the horizontal direction.
The present invention is directed to a holographic stereogram (so-called Fully) having parallax information in the horizontal and vertical directions.
Of course, it is also applicable to (Parallax). In such a holographic stereogram producing apparatus, the object laser beam L2 and the reference laser beam L3 are condensed into dots instead of being condensed by the cylindrical lenses 23 and 33, and the hologram recording medium 1 is collected. The entire surface is exposed by moving two-dimensionally relative to the light position.

In the holographic stereogram producing apparatus 10 described above, a viewpoint conversion process for associating the parallax information of the parallax image sequence G1 generated by the re-centering imaging method with the parallax information of the exposure image information D2; Parameter processing and image information processing that do not cause a jagged phenomenon are performed on the exposure image information D2 that has been subjected to the viewpoint conversion processing and reconstructed. Specifically, the image information processing reconstructs an image of the parallax image sequence G1 captured by the parallax image sequence imaging device 3 with the shooting distance df set as a parameter in advance.

The parameters are, for example, when the parallax image sequence G1 is photographed by another imaging method, when the hologram recording image 5 is recorded at an appropriate depth position on the hologram recording medium 1, or when the hologram recording image 5 is recorded in the horizontal and vertical directions. In the case of creating a holographic stereogram having the above-described parallax information, not only the photographing distance df but also changeable parameters excluding fixed parameters are used. When the image information is generated using the image information generating computer 4, image information to which an appropriate parameter correction value has been added in advance is created.

[0089]

As described above in detail, according to the method for recording image information according to the present invention, a viewpoint conversion process is applied to a parallax sequence image and an exposure image reconstructed with continuity with each other. Since the recorded image is recorded on the recording medium based on the image, it is possible to obtain a high-quality reproduced image free from spatial distortion, blur, or jagged phenomena without being affected by the viewpoint distance condition.

Further, according to the image information recording apparatus of the present invention, in the image information processing section, the supplied parallax image sequence is subjected to the viewpoint conversion processing and the exposure reconstructed with continuity with each other. Since the recording image is recorded on the recording medium by modulating the image of the laser beam based on the image, it is possible to create a recording medium that obtains a high-quality reproduced image without blurring or jaggy phenomena without being affected by the viewpoint distance condition. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an overall configuration of a holographic stereogram producing apparatus shown as an embodiment of the present invention.

FIG. 2 is a diagram illustrating a process of creating a holographic stereogram by the holographic stereogram creating apparatus.

FIGS. 3A and 3B are explanatory views of a holographic recording medium used in the holographic stereogram producing apparatus. FIG. 3A is a sectional view of a main part, and FIG. FIG. (C) shows an exposure state, and FIG.
Indicates a fixing state.

FIG. 4 is a diagram schematically illustrating an optical system of the holographic stereogram producing apparatus.

FIG. 5 is a diagram schematically illustrating a configuration of a recording medium feeding mechanism provided in the holographic stereogram producing apparatus.

FIG. 6 is a schematic diagram illustrating a method for creating a parallax image sequence, which is supplied to the holographic stereogram creating apparatus.

FIG. 7 is a schematic diagram illustrating another method for generating the same parallax image sequence.

FIG. 8 is an explanatory diagram of a viewpoint conversion process performed on a parallax image information sequence.

FIG. 9 is a diagram illustrating specific contents of the viewpoint conversion process.

FIG. 10 is a diagram illustrating correspondence between an element parallax image and an element display image in the viewpoint conversion processing.

[Explanation of symbols]

Reference Signs List 1 hologram recording medium (recording medium), 2 holographic stereogram, 2a hologram plane (image recording reference plane), 3 parallax image sequence imaging device, 4 image information generation computer, 5 hologram recording image (recorded image), 5g Element hologram recording image, 10 holographic stereogram producing device, 11 image information processing unit, 12 control unit, 13 printer unit, 14 optical system,
Reference Signs List 15 recording medium feeding mechanism, 16 laser light source, 23 second cylindrical lens, 24 liquid crystal display (display), 40 reproduced image, D1 parallax image information, d1 element parallax image information, D2 exposure image information, G1 parallax image Column, g1 element parallax image, G2 exposure image, g2
Element exposure image, L1 laser light, L2 object laser light, L3 reference laser light, df shooting distance of parallax image sequence, dv viewpoint distance

Claims (6)

[Claims] 1. An object laser light image-modulated based on each elemental parallax image of a parallax image sequence and a reference laser light having coherence with respect to the object laser light are incident on a recording medium. In a method for recording image information in which interference fringes generated by an object laser beam and a reference laser beam are sequentially recorded on the recording medium as an element recording image, parallax image sequence information based on the parallax image sequence is recorded on the recording medium. A viewpoint conversion process for reconstructing the element parallax image information is performed so as to generate the element parallax images for localizing the reproduced image based on the recorded image near the image recording reference plane, and the image is reconstructed. A parameter processing for giving continuity in a parallax direction to each of the element parallax image information. 2. The parallax image sequence information based on the parallax image sequence is used as a parameter for giving continuity to the reconstructed elemental parallax image information in a parallax direction to a recorded image recorded on a recording medium. 2. The image information recording method according to claim 1, wherein a viewpoint distance of a reproduced image is set based on the reproduction distance. 3. The parallax image sequence is photographed at a photographing distance equal to a viewpoint distance of a reproduced image based on a recorded image recorded on the recording medium, and the respective parallax image sequences are reconstructed using the photographing distance as a parameter. The method for recording image information according to claim 1, wherein continuity in a parallax direction is provided to the element parallax image information. 4. A recording medium, an image information processing unit to which disparity image sequence information based on a disparity image sequence captured by a disparity image sequence imaging device is supplied, and a display for displaying each element disparity image of the disparity image sequence. An interference pattern between an object laser beam image-modulated based on the displayed elemental parallax image and a reference laser beam having coherence with respect to the object laser beam as the element recording image A printer unit for sequentially recording the image information processing unit, the image information processing unit, for the element parallax image information of the parallax image sequence information based on the parallax image sequence, the reproduced image based on the recording image recorded on the recording medium A viewpoint conversion process for reconstructing each of the element parallax images to be localized near the image recording reference plane, and a parallax method for each of the element parallax image information reconstructed based on the set parameters. An image information recording apparatus for performing parameter processing for giving direction continuity. 5. The image information processing unit performs a parameter process on parallax image sequence information based on the parallax image sequence using a viewpoint distance of a reproduced image based on a recorded image recorded on the recording medium as a parameter. The image information recording apparatus according to claim 4, wherein the element parallax image information having continuity in a parallax direction is generated. 6. An image parallax image photographed by the parallax image sequence imaging device at a photographing distance equal to a viewpoint distance of a reproduced image based on a recorded image recorded on the recording medium. The disparity image information based on the sequence is supplied, and the element disparity image information having the continuity of the disparity direction is generated by performing parameter processing on the disparity image sequence information based on the disparity image sequence using the shooting distance as a parameter. The image information recording apparatus according to claim 4, wherein: