JPH10282870A - Hologram and its preparation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reproduce plural images according to a watching direction, the position of a film or the position of a light source at the time of watching the reproduced image of hologram by arraying plural images, which are obtained by respectively Fourier-transforming plural original images and then binarizing them, so as to output on a film. SOLUTION: Plural original images 11, 13 and 15 are prepared (S201). Next, the Fourier-transformed images of the original images 11, 13 and 15 are prepared by using a personal computer (S202) and each Fourier-transformed image is binarized (S203). Next respectively binarized Fourier-transformed images A, B and C are arrayed (S204) to obtain an image 23. Then, relating to the image 23, the images A are arrayed in areas 25-1 and 25-2, the images B are arrayed in areas 27-1 and 27-2 and the images C are arrayed in areas 29-1 and 29-2. The images arrayed like this are outputted on the film by using a laser scanner (S205).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hologram and a method for producing a hologram.

[0002]

2. Description of the Related Art As a conventional hologram, for example, there is a hologram in which a certain pattern is output on a film, a point light source is placed behind the film, and when the film is viewed, an image is output behind the film.

[0003]

However, such a hologram only reproduces a single image.
The present invention has been made in view of such a problem,
It is an object of the present invention to provide a hologram from which a plurality of images are reproduced and a method for producing the hologram.

[0004]

According to the present invention, in order to achieve the above-described object, a plurality of original images are each subjected to Fourier transform, and then a plurality of binarized images are arranged and output on a film. A hologram, wherein when a reproduced image of the hologram is viewed, a plurality of images are reproduced according to a viewing direction, a position of the film, or a position of a light source; Creating an original image, (b) creating a Fourier transformed image of the plurality of original images, (c) binarizing the plurality of Fourier transformed images, and (d). Arranging the binarized Fourier-transformed images; and (e) outputting the arranged images to a film. In the step (d), a reproduced image is reproduced by both eyes. Arrange the Fourier transform images so that they can be seen. Which is a method of creating a hologram, characterized.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram of an apparatus for performing a hologram creation method according to one embodiment of the present invention. The personal computer 1 creates a plurality of original images 11, 13, and 15, performs a process such as Fourier transform, creates a repetitive pattern image, and stores it on a floppy disk (FD) 3. The laser scanner 5 reads the repetitive pattern image stored on the floppy disk 3 and outputs it to the film 31. Note that an optical disk or the like may be used instead of the floppy disk 3, the personal computer 1 and the laser scanner 5 may be directly connected, or may be connected via a network.

FIG. 2 is a flowchart showing a method for producing a hologram. First, a plurality of original images 11, 13, and 15 are created on the personal computer 1. Original image 1
1 is “a”, original image 13 is “b”, original image 15 is “c”
It is a pattern of.

Next, Fourier transform images of the original images 11, 13, and 15 are created using the personal computer 1 (Step 202), and each Fourier transform image is binarized (Step 203). That is, the phase is examined for each pixel of the Fourier transform image, and if the phase is from minus 90 degrees to plus 90 degrees, a certain value Tp (for example, transparent) is assigned; otherwise, another certain value Tm (for example, black) is assigned. )
Is binarized by assigning. The range in which Tp is allocated can be set to a value other than minus 90 degrees to plus 90 degrees. Also, the range to which Tp is assigned can be determined from the amplitude instead of the phase.

In FIG. 2, A is a Fourier transform image corresponding to the original image 11, and B and C are the original images 13 and
15 is a Fourier transform image corresponding to No. 15.

Next, the binarized Fourier transform images A, B, and C are arranged (step 204) to obtain an image 23. In the image 23, the Fourier transform images A are arranged in the regions 25-1 and 25-2, the Fourier transform images B are arranged in the regions 27-1 and 27-2, and the regions 29-1 and 29-
2, a Fourier transform image C is arranged. And area 2
The distance between the left end of 5-1 and the left end of the area 25-2 is set as the distance between both eyes. Similarly, the left end of the area 27-1 and the area 27-
2 and the left end of the area 29-1 and the area 29
The distance from the left end of -2 is also the distance between both eyes.

The images arranged in this manner are output onto the film 31 using the laser scanner 5 (step 205).

FIG. 3 is an explanatory diagram in the case where an image is reproduced using the film 31 obtained in step 205. In FIG. 3, reference numeral 51 denotes a person, and 55 denotes a point light source. A point light source 55 is arranged behind the film 31 and the person 51
1, an image 57 to be pointed can be seen around the point light source 55 corresponding to the image in the film 31. In FIG. 3, the image “a” is reproduced.

Then, when the direction in which a person views is changed, the film 31 is moved, or the position of the point light source 55 is changed, an image of "b" or an image of "c" is reproduced. FIG. 4 shows the position of a point light source at which each reproduced image can be seen with both eyes. In FIG. 4, 33 indicates the left eye, 35 indicates the right eye, 41 indicates the position of the light source from which the reproduced image “a” can be seen by both eyes, and 43 indicates the position of the light source from which the reproduced image “b” can be seen by both eyes. The position 45 indicates the position of the light source at which the reproduced image “c” can be seen with both eyes.

FIG. 5 shows the conditions of the arrangement of the Fourier transform image on the film 31 so that the reproduced image can be viewed with both eyes when the film 31 is parallel to the straight line connecting both eyes. FIG.

In FIG. 5, X is the distance between the right and left eyes, and Y is
Are the left end of the area 25-2 for the right eye and the area 25-1 for the left eye
Is the distance between the left end of the left-eye area 25-1 and the right end of the right-eye area 25-2. Reference numeral 41 denotes a position of a light source at which the reproduced image “a” can be seen with both eyes.

The condition for the existence of a light source position at which the same reproduced image can be seen by both eyes is X> Y.

The condition that there is a light source position where the same reproduced image can be seen by both eyes and that the area is semi-infinite is as follows: Z ≧ X> Y.

FIG. 6 is an explanatory diagram showing conditions for arranging the Fourier transform images on the film 42 so that the reproduced image can be seen with both eyes when the film 42 has a curved surface.

In FIG. 6, based on a straight line connecting the center of the left eye and the center of the right eye, θRR is the angle formed by the straight line connecting the right end of the right eye region 25-2 and the center of the right eye 35, and θRL is the right eye angle. The angle formed by a straight line connecting the left end of the area 25-2 and the center of the right eye 35, θLR is the angle formed by a straight line connecting the right end of the left eye area 25-1 and the center of the left eye 33, and θLL is the left eye area 25. The angle formed by a straight line connecting the left end of -1 and the center of the left eye 33.

Reference numeral 44 denotes the position of the light source at which the reproduced image "a" can be seen with both eyes. The condition for the presence of the light source position where the same reproduced image can be seen by both eyes is θRL> θLR.

The condition that the position of the light source where the same reproduced image can be seen by both eyes is present and the area is semi-infinite is θRL> θLR and θLL ≧ θRR.

The Fourier transform images may be output on the films 31 and 42 so as to satisfy such conditions.

Although three types of images are used as original images in the present embodiment, other numbers of images may be used. In this embodiment, different images “a”, “b”, and “c” are used, but a pattern in which “A” gradually changes to “R” may be created. In this case, at the time of reproduction, for example, when the film is moved, an image in which “A” gradually changes to “R” is obtained.

FIG. 7 is an explanatory diagram of a hologram when a Fourier transform image is arranged in a heart-shaped region. In FIG. 7, reference numeral 61 denotes a film.
At -2, a Fourier transform image of "a" is recorded. Area 6
The Fourier transform image of “b” is recorded in the area 5-1 and the area 65-2. In FIG. 7, X is the distance between the left eye and the right eye. No image is recorded in areas other than the areas 63-1, 63-2, 65-1, and 65-2. In this hologram, when viewing the area 63-1 with the left eye and viewing the area 63-2 with the right eye, a reproduced image of “a” appears, and viewing the area 65-1 with the left eye.
Looking at the area 65-2 with the right eye, a reproduced image of “b” appears.

FIG. 8 is an explanatory diagram of a hologram when a halftone image 77 is embedded. In FIG. 8, reference numeral 71 denotes a film, a Fourier transform image of “a” is recorded in an area 73, and a Fourier transform image of “b” is recorded in an area 75. Then, the halftone image 77 is recorded in the heart-shaped area.

FIG. 9 is an explanatory diagram of a hologram in which a Fourier transform image is recorded in a fan-shaped area inside a circle. In FIG. 9, reference numeral 101 denotes a film, which divides a circle in the film into six, and assigns “a”, “b”, “c”, “d”,
The Fourier transform images of “e” and “f” are recorded.

Then, as shown in FIGS. 10 and 11, by rotating the film 101, different reproduced images can be obtained. 10 and FIG.
Reference numeral 5 denotes a point light source. In the case of FIG. 10, "a" is used as the reproduced image.
In the case of FIG. 11, “e” is obtained as a reproduced image.

FIG. 12 is an explanatory diagram of a hologram in which a Fourier transform image is recorded in a fan-shaped area inside a circle and can be viewed with both eyes. In FIG. 12, reference numeral 111 denotes a film, a circle in the film is divided into six, and each sector has "a",
The Fourier transform images of “b” and “c” are respectively recorded in point-symmetric regions.

Then, as shown in FIG.
By rotating 11, different reconstructed images can be obtained. In FIG. 13, 123 is the left eye, 125 is the right eye, 1
Reference numeral 27 denotes a point light source.

FIG. 14 shows a hologram shown in FIG. 12 in which a halftone dot image is embedded. In FIG.
Indicates a film, and 77 indicates a halftone image.

Although the film is rectangular in FIGS. 3, 7 and 8, the film can be processed into eyeglasses and used as eyeglasses. The holograms shown in FIGS. 9, 12, and 14 can be used for windmills and the like.
The holograms shown in FIGS. 8 and 14 can be used at a wedding reception or the like by using, for example, a photograph of a wedding couple as a halftone dot image.

[0031]

As described in detail above, according to the present invention, it is possible to provide a hologram for reproducing a plurality of images and a method for producing the hologram.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an apparatus for implementing a hologram creating method.

FIG. 2 is a flowchart showing a method of creating a hologram.

FIG. 3 is an explanatory diagram when an image is reproduced using a film 31;

FIG. 4 is a diagram showing the position of a light source where a reproduced image can be viewed using both eyes.

FIG. 5 is a diagram showing conditions of arrangement of a Fourier transform image so that a reproduced image can be viewed using both eyes.

FIG. 6 is a diagram showing conditions of arrangement of a Fourier transform image so that a reproduced image can be viewed using both eyes.

FIG. 7 shows another hologram.

FIG. 8 shows another hologram.

FIG. 9 shows another hologram.

FIG. 10 is an explanatory view when the hologram shown in FIG. 9 is used.

FIG. 11 is an explanatory view when the hologram shown in FIG. 9 is used.

FIG. 12 shows another hologram.

FIG. 13 is an explanatory view when the hologram shown in FIG. 12 is used.

FIG. 14 shows another hologram.

[Explanation of symbols]

 A, B, C ... Binary Fourier transform image 1 ... Personal computer 3 ... Floppy disk 5 ... Laser scanner 11, 13, 15 ... Original image 31 ... Film 55 ……… Point light source

Claims (8)

[Claims] 1. A hologram which is obtained by Fourier transforming a plurality of original images and arranging a plurality of binarized images and outputting the resulting images on a film. A hologram, wherein a plurality of images are reproduced according to a direction, a position of the film, or a position of a light source. 2. The hologram according to claim 1, wherein the plurality of original images are continuously changing images. 3. The method according to claim 1, wherein the plurality of binarized images are arranged in an area having a predetermined shape.
The hologram described. 4. The hologram according to claim 3, wherein the plurality of binarized images are arranged in fan-shaped regions obtained by dividing a circle. 5. The hologram according to claim 1, wherein a halftone image is embedded in a part of the hologram. 6. A method of: (a) creating a plurality of original images;
(B) a step of creating a Fourier transformed image of the plurality of original images; (c) a step of binarizing the plurality of Fourier transformed images; and (d) each of the binarized images. And (e) outputting the arranged images to a film. In the step (d), each of the images is read so that the reproduced image can be viewed with both eyes. -A method for producing a hologram, comprising arranging a Rier transform image. 7. In the step (d), the images are arranged in a left-eye area and a right-eye area, a distance between the left and right eyes is X, a right end of the left-eye area and a left end of the right-eye area. 7. The hologram according to claim 6, wherein the distance is set so that Z ≧ X> Y, where Z is the distance between the left end of the left-eye area and the right end of the right-eye area. How to create 8. The step (d) comprises arranging the images in a left-eye area and a right-eye area, and using a straight line connecting the center of the left eye and the center of the right eye as a reference, θRR: the right-eye area Angle formed by a straight line connecting the right end and the center of the right eye θRL: Angle formed by a straight line connecting the left end of the right eye area and the center of the right eye θLR: Angle formed by a straight line connecting the right end of the left eye area and the center of the left eye 7. The hologram forming method according to claim 6, wherein the array is arranged such that θRL> θLR and θLL ≧ θRR, where θLL is an angle formed by a straight line connecting the left end of the left eye region and the center of the left eye.