JPS59191081A - Manufacture of holographic stereogram - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION With regard to the method of creating images, in particular, by using a computer to correct distortions caused by changes in observation distance or distortions caused by movement of a subject during the shooting of original manuscript images, a certain viewing distance can be obtained. The present invention relates to a method for producing a distortion-corrected holographic stereogram in a patent application.

A holographic stereogram is a type of hologram created using photographs with different parallaxes. This has the feature that it can display three-dimensional images of any subject that can be photographed normally. Since it can be enlarged and reduced and even moving objects can be made into holograms, it is possible to display three-dimensional images of objects that cannot normally be photographed as holograms.

However, due to the manufacturing method of the holographic stereogram, distortion of the image may occur.

The method for manufacturing a holographic stereogram according to the present invention involves dividing a sequence of original original images obtained by ordinary photography into vertical rectangular plane elements using a computer, and rearranging each divided plane element. A plurality of reconstructed original images are synthesized by , and a holographic stereogram is synthesized from this reconstructed original image sequence, and when reconstructing the reconstructed original image sequence, the holographic stereogram is viewed from an arbitrary point. In such cases, by configuring the system so that a single original image is observed, distortions caused by changes in the observation distance and distortions caused by the subject moving while shooting a series of original original images can be corrected, and a distortion-free image can be created. The present invention relates to a method for producing a holographic stereogram in which a holographic stereogram is reproduced.

For analysis of distortion in reconstructed images of holographic stereograms, please refer to 0ptics Communica.
-tions 1981 Vol. 36 No. 1 p. 11 i,',
Honda, K. 0kada and J.Tsu ji.
3-DDistort published by uchi et al.
ion Of 0bserved Images Re
constructionFrom A Cylind
rical Holographic Stereog
ram ((1) La5er Light Recon
struction Type)XOPticsCom
K. in 1981, Vol. 36, No. 1, p. 17.

0kada, T-Honda and J, Tsujiu
Published by Chi et al.

3-D Distortion of 0bserv
ed Images Recon-struction
From A Cylindrical Holog
rapicStereogram ((2) White Light Reconstr
Although it is explained in detail in ``Cuction Type'', etc., we will briefly explain the mechanism by which distortion occurs.
In particular, the present invention for correcting distortion will be described in detail. For example, the first
The reason why distortion occurs in a cylindrical holographic stereogram when a holographic stereogram is created using only horizontal parallax will be explained using figures.

In the same figure, one of the rows of original original images photographed from point Ho.
All the points on the subject, such as point A9 and point A', which are on the straight line connecting the point Δ on the subject and the center point HO of the lens, are reflected in the dots of the images. On the other hand, point A″′ photographed from point BO, which is farther away than point HO, shows point A as it is, but other points such as ′′ on the straight plate are recorded at a different position from point A. This difference causes the reproduced image of the holographic stereogram to be distorted, but the purpose of the present invention is to correct this distortion.Here, the distance from the center of the subject is determined by the point Considering an image taken at a point AO, which is the same as BO but taken in a different direction, the position A' recorded to the point includes the projected images of all points on the straight line Al (o, so Regarding the point, it is the same as the image recorded at point A1 of the image taken at point HO.Similarly, the image recorded at point B1 of the image at point HO is the same as the image recorded at point B1 of the image taken at point HO.
The image recorded at point B' and point C1 of the image photographed at is equal to the image at point C, respectively.

The present invention extracts plane elements corresponding to each viewing direction from a sequence of original original images photographed from a certain distance, and separates them so that the synthesized holographic stereogram appears without distortion when observed from a different distance. The distortion is corrected by rearranging the original image sequence to create a new reconstructed original image sequence.

FIG. 2 explains in more detail the method for manufacturing a distortion-free holographic stereogram according to the present invention.

Manuscript original image sequence 10:1, 10:2. ~, 10:N is a reconstructed image of a cube made of wire, which is the object 5 on the tar/table 4 in this example, taken by the usual method to obtain a holographic stereogram. Camera 6 placed at a distance equivalent to the observation position of
This is a sequence of images obtained by rotating the image by a constant angle of 1 degree in front of the image. [Original image] At 0:1, an image of the subject observed from the left side is obtained, at original image 10:S, an image observed from the front in the illustrated example, and at original original image 10:N, an image observed from the right side is obtained. . Here, it is assumed that the number is less than or equal to S f'iN. Note that in this figure, the subject is drawn with emphasis on perspective for better understanding. Further, a thick wire is used for the rectangle in front of the cube of the subject 5.

Here, according to the prior art, these N manuscript original image rows 10
When a holographic stereogram is synthesized from the holographic stereogram according to the prior art, a distorted reconstructed image such as the reconstructed image 50:S' of the holographic stereogram 50 from the front is observed. That is, for the above-mentioned reason, the square on the front side of the subject is observed to be shrunk in the horizontal direction, and the square on the back side is observed to be horizontally elongated. In order to correct this distortion, the original original image row 10
:1. lO:2. ~10: S, ~, 10:N is divided into strip-shaped surface elements, and multiple reconstructed original images are synthesized by rearranging each divided surface element. A new reconstructed original image sequence 20:1.20: is created so that when the holographic stereogram 30 completed from the layout configuration original image is viewed from any one direction, one image of the original manuscript original image is observed. 2. ~,20:S,~,20
:M, and using the obtained reconstructed original image sequence, a holographic stereogram 30 is synthesized by a conventional method. In order to synthesize the reconstructed original images in this way, the individual images of the original original image sequence and the reconstructed original image sequence are each divided into X rectangular pieces, and the area elements are divided from the right into a, l a2+ ”i a l, respectively. ... If ax, then the area element ai of reconstruction-original image 20:S is the original original image + o: (
s−r:1)] is achieved by composing the plane element a1. If 10:2.5.10:3.5
If pixels such as 10:2, 10:3, etc. are required, they may be synthesized by interpolation, or 10:2, 10:3, etc. in the vicinity thereof may be used. For example, as shown in FIG. 3, a row of nine manuscript original images 10:
], 10:2. ...Prepare 10:9, of which 10:3.10:4. When a holographic stereogram 50 is synthesized using the conventional method from a sequence of ~10 near original original images, the reconstructed image 50:s' from the front is, from the right, original 10 near surface element al + original original image 10:60 surface element a2+
A composite image consisting of the area element a3 of the original original image 10:5 + the area element at of the original original image 10:4 + the area element a5 of the original original image *10:3 is observed, resulting in a distorted image.

However, as in the present invention, the original manuscript image io:j, ..., 1o:
9, the reconstructed image 20:3. ~,2
In the holographic stereogram 3o synthesized based on the reconstructed original image obtained by fabricating the holographic stereogram 3o, a reconstructed image 30:S' without distortion is obtained when viewed from the front from the direction in which the original original image 10:5 is photographed.

Next, a description will be given of distortion that occurs due to movement of the subject during photographing of the original original image. If the subject moves while shooting the original original image, during playback, different parts of the original image that are shifted in time will be stitched together and observed, so depending on the direction and speed of movement, the observation may be difficult. The reproduced image becomes considerably distorted as the image is stretched or deformed.

In the present invention, when an observer observes a reconstructed image of a holographic stereogram, the original original image is captured by reconstructing the reconstructed original image sequence and synthesizing the holographic stereogram from the reconstructed original image, as described above. It is possible to correct the distortion of the reproduced image that sometimes occurs due to movement of the subject.

An embodiment of the present invention for synthesizing a reconstructed original image sequence from an original original image sequence according to the present invention will be described below with reference to the block diagram in the fourth section. That is, a movie film 60 photographically recorded as a sequence of original original images of a holographic stereogram is prepared, and each frame thereof is scanned, for example, by an image input device 70 such as a flying spot scanner connected to a computer 80.
Since the yield data of 256 x 256 picture elements inputted as pixel data of 56 x 256 picture elements is a considerable amount of data, it is necessary to use a magnetic tape 85 that can store a large amount of data.
etc. will be recorded externally. As mentioned above, in the case of this actual example, two to three corresponding lines in the vertical direction are extracted from the 510 to 100 frames of the original original image row, and 256 x 2
A fly/gespot scanner 90 for synthesizing one reconstructed original image of 56 picture elements and outputting an image connected to a computer
The reconstructed original image for one frame is outputted to the photographic film 100 using a photo printer such as the above.

By sequentially compositing images while changing the line for extracting this operation and outputting them as frames one after another, a movie film 100 on which a sequence of composite reconstructed original images is recorded is completed.

Using this as the original image, a holographic stereogram was created using a conventional method, and a distortion-free holographic stereogram was completed. FIG. 5 is a flow chart diagram of the embodiment shown in FIG.

No. jl/L 2, ■-2 t'l'F:'; In setting the frame number of the completed original picture, set the initial value of the frame number of the reconstructed original picture to be created, and then set the initial value of the frame number of the reconstructed original picture of P3. In setting the recorded surface elements, set the initial value of the surface elements to be recorded in the reconstructed original image set in P2, and in the calculation to obtain the identified surface elements from the original original image in P4, set the initial value of the surface elements to be recorded in the reconstructed original image set in P3. Calculations are performed to obtain the plane elements to be recorded as plane elements of the reconstructed original image from the original manuscript image, and in RE it is determined whether or not the area elements obtained in P4 are wired magnetically in the original manuscript image.
), the process returns to P3, where the next recording surface element of the reconstructed original image is set, and the same loop is repeated thereafter. If it is determined that one reconstructed original picture has been completed in P, reconstructed original picture 1i! In the output of i11 screen,
The reconstructed original images for one screen, sequentially recorded in the memory of the computer at P, are outputted to the film 100 at 7 Rai/Gbotsskyana 9o, and the next P8 reconstructed original image sequence is completed. If so, return to P2, the next frame number of the reconstructed original image to be created is set in P2, and the same loop is repeated, and the necessary number of reconstructed original images are created on film 1.
After outputting 00, it ends.

Since the present invention has the above structure, it has excellent effects as shown below.

That is, it is possible to correct distortions caused by changes in the conventional observation distance and distortions caused by movement of the object during photographing of a sequence of original original images.

Therefore, it is possible not only to obtain a reconstructed image of the subject as it is without distortion, but also to be able to apply it to the field of physical measurement, medical technology, etc., which was not available at present, even when there is distortion. It would be great to further expand the application fields of graphic stereograms.

[Brief explanation of the drawing]

The drawings show one practical example of the present invention, and FIG. 1 is an explanatory diagram for explaining the reason why distortion occurs, and FIG.
The figure is an explanatory diagram showing the steps of the manufacturing method of the present invention.
The figure is a block diagram showing the process of creating a reconstructed original image sequence from a manuscript original image sequence, and FIG. 5 shows a flowchart of the computer processing in FIG. 4, respectively. 5...Subject 10...Manuscript original image row 20...
Reconstructed original image sequence 30...Holographic stereogram a, az "' a j+ '-aX ・'
Menso Patent Applicant Toppan Insei Co., Ltd. Representative Precious Japanese Dog (2 others) Brush 5Fla Procedure Neyama Sesho (Method) % Formula % 1. Indication of the incident 1988 Patent Application No. 66177 2. Invention Name: Method of manufacturing small log granoic stereograms 3. Relationship with the case of the person making the amendment (Address of patent applicant: 1-5-1 Taito, Taito-ku, Tokyo) Pagi, Pa 111' 4. Amendment order Date Sent on July 26, 1980 5, Subject of amendment A) Detailed description of the invention in the specification box Column 6) Brief description of the drawings in the specification Column 6, Contents of the amendment A> Specification, page 4, No. 4 Row I'X' OP tic
Correct sj to [ or Qptics J. (Example) The ``4th space'' on page 9, line 15 of the specification has been corrected to ``Figure 4''. c) Amend "Yes, FIG. 4" on page 12, line 20 of the specification to "Yes, FIG. 3 is an explanatory drawing showing one specific example of the present manufacturing method, and FIG. 4."

Claims (1)

[Claims] j) Prepare a plurality of original original images in advance, divide the original original into strips in the vertical direction and rearrange them to synthesize a plurality of reconstructed original images; A holographic stereogram is synthesized from the original composition image, and when composing the reconstructed original image, it is made such that when the reconstructed image of the holographic stereogram is viewed from any one point, one original original image is observed. A method for manufacturing a holographic stereogram, comprising: 2) In composing the reconstructed original image, the sequence of original original images]
0:I, 10:2. ~10:N reconstructed original image sequence 20:
1,20: 2. ~20:M, and if the area elements divided into vertical strips are aI+a2+~ax from the right, then the area element ai of the reconstructed original image 20:S is the original original image 10
:fS-(J1-1)), and l:9, so that when the holographic stereogram is viewed from any one point, one original manuscript image is observed. The method for manufacturing a holographic stereogram according to claim 1