JPS5943037B2 - Color image recording/playback method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color image recording/reproducing method for holographically recording a color image and reproducing the same.

Various types of recording and reproducing methods have been proposed for recording and reproducing such color images, but the configurations are complicated and expensive, or the recording is difficult to perform easily. They were difficult to accomplish, and none of them were completely satisfactory.

Therefore, the present invention can achieve the following without having a complicated or expensive configuration.
The purpose of this paper is to propose a new method for recording and reproducing such color images that can be easily recorded and reproduced with high quality.
It will become clear from the detailed description of the embodiments of the present invention with reference to the drawings.

First, an example of the color image recording method according to the present invention will be described with reference to FIGS. )
A color stripe, which is known per se, has a configuration in which stripe-shaped color filter elements 3C that transmit all color light except color light and stripe-shaped color filter elements 3W that transmit all color light are arranged in alternating order. filter 4
are disposed facing each other, and between the imaging lens 2 and the color stripe filter 4, a first color light, for example green light, among the color light that is not blocked by the color filter element 3C of the filter 4 is provided. A color filter 5A that transmits color light is disposed, and a monochromatic light image recording medium 6A is disposed on the opposite side of the color stripe filter 4 from the color filter 5A side, and the subject 1 is irradiated with white light LO. Then, a light image L1 of a color image is obtained from the subject 1 side, and from the light image L1, it is transmitted through the imaging lens 2 and the first color filter 5A.
A light image L2A of the color light is obtained, and a light image L3A of the first color light is obtained by passing the light image L2A through the color stripe filter 4 (this light image L3A is generated because the first color light passes through the entire area of the color stripe filter 4). A light image similar to the light image L2A) is obtained, and this light image L3A is further projected onto the monochromatic light image recording medium 6A, so that information regarding the first color light, that is, green light of the subject 1 is transmitted to the medium 6A1. Record the latent image.

Next, between the imaging lens 2 and the color stripe filter 4, in place of the above-mentioned filter 5A, a color filter 5B is provided which makes all other color lights other than the first color light as second color light and transmits the second color light. , and a monochromatic optical image recording medium 6B similar to the monochromatic optical image recording medium 6A is placed on the opposite side of the color stripe filter 4 from the color filter 5B side. By irradiating with white light LO, a color image L1 is obtained from the subject 1 side, and the light image is transmitted through the imaging lens 2 to the color filter 5B.
to obtain the optical image L2B of the second color light, and furthermore, the optical image L2B is obtained.
The striped portion of the light image L2B that passes through the color stripe filter 4 of 2B corresponds to the color filter element 3C is blue color light, and the stripe portion corresponding to the color filter element 3W is composed of composite color light of red and blue color light. A light image L3B is obtained by modulating the light image L2B with the color stripe filter 4, and this light image L3B is further projected onto a monochromatic optical image recording medium 6B, so that the red and blue colors of the subject 1 are recorded on the medium 6B. Information regarding colored light is recorded as a latent image. Next, the monochromatic optical image recording media 6A and 6B on which the latent images described above are recorded are developed,
A monochrome image 7A in which information regarding the green light of the subject 1 is developed and a monochrome image 7B in which information regarding the red and blue light of the subject 1 is developed are obtained, and first a monochrome image as shown in FIG. 1B is obtained. 7A and a hologram recording medium 8 are arranged to face each other via a Fourier transform lens 9, and the monochrome image 7A is irradiated with a coherent laser beam L5 from the side opposite to the hologram recording medium 8 side. A laser beam image L6A is obtained from the hologram recording medium 8 side through a monochromatic image 7A of the laser beam L5, and this is projected onto the hologram recording medium 8 via an imaging lens 9.
The reference beam L7A for hologram recording is projected onto the hologram recording medium 8, and the optical image L6A and the reference beam L7A are made to interfere with each other to form a first hologram recording, and then a monochromatic image 7B is created in place of the monochromatic image 7A. Then, in the same manner as described above (the monochromatic image 7B is irradiated with the laser beam L5, an optical image L6B is obtained through the monochromatic image 7B of the laser beam L5, and this is projected onto the hologram recording medium 8, while the hologram Another hologram reference beam L7B is projected onto the recording medium 8 from a direction different from the reference beam L7A, and the hologram recording medium 8
The second light image L6B and the reference light L7B are caused to interfere with each other.
The first hologram recording is superimposed on the first hologram recording, thus recording a color image of the subject 1. The color image recording method according to the present invention has been clarified above. Next, an example of the reproduction method will be described with reference to FIG. 2. The hologram recording medium 8 is developed to obtain a hologram 10 formed by developing the first and second hologram recordings made in a superimposed manner. to record the first hologram, i.e. the above-mentioned optical image L6A or L3.
A reproduced optical image formed by multiplexing the optical image L9A corresponding to A and the optical image L9B having a wavefront polarized orthogonally to the second hologram recording, that is, the optical image L9A corresponding to the optical image L6B or L3B described above. (L9A+L9B) as hologram 1
0 from the side opposite to the side irradiated with the laser reproduction beams L8A and L8B, and input it to the polarization splitter 12 via the imaging optical system 11, and from this polarization splitter 12 a reproduction light image (L9A+L9B ) inside optical image L9
A and L9B are obtained by spatially separating them from each other, and these are projected onto the monochromatic image pickup tubes 13A and 13B, respectively, so that the monochromatic image pickup tube 13A displays information regarding the green colored light of the subject 1. The image signal ElA is transferred to the monochromatic image pickup tube 13B.
From this, an electrical image signal ElB representing information regarding the red and blue color lights of the subject 1 is obtained, and furthermore, an electrical image signal E1B is obtained.
1A and ElB are supplied to the processing circuit 14 to obtain a composite color video signal E2 representing the object 1 according to the NTSC system, for example, and this is supplied to the color television receiver 15 to represent the object 1. A color image 16 is reproduced and obtained.

The above has clarified an example of the color image recording/reproducing method according to the present invention. According to such a method, the light image of the color image (light image L1 in the upper case) is The first light image (light image L6A in the upper case) obtained through the color filter (color filter 4A in the upper case) for the first color light (edge color light in the upper case) and the light image of the color image are A second light image (upper side) obtained through a color stripe filter (color stripe filter 4 in the upper case) for a second color light different from the first color light (color light excluding green light from all color lights in the upper case). In the case of light image L6B)
and the first light image and the first reference light (reference light L7A in the upper case), and the second light group and the second reference light (
In the upper case, a color image is recorded by interfering the reference beams L7B) with each other to record a hologram. 2 (in the upper case, the reproduction lights L8A and L8B) and the polarization splitter (in the case of the upper example, the polarization splitter 12 is used to generate the first and second optical images corresponding to the first and second optical images described above). The first and second reconstructed light images (light images L9A and L9B in the above example) corresponding to the above are obtained by spatially separating them from each other, and monochromatic imaging is obtained from the first and second reconstructed light images. First and second electrical image signals (image signals ElA and ElB in the above example) corresponding to the first and second optical images described above using tubes (monochromatic image pickup tubes 13A and 13B in the above example). The above-mentioned color image based on the first and second electrical image signals ≤ the corresponding electrical color image signal (color image signal E2 in the case of p in the above example). Since reproduction is performed, color images can be recorded and reproduced easily and with high quality without requiring a complicated or expensive configuration.

Next, another embodiment of the color image recording method according to the present invention will be described with reference to FIG. 3. Parts corresponding to those in FIG. Although omitted,
A color optical control plate 3 is attached to the subject 1 through the imaging lens 2.
A color filter 5A is arranged between the imaging lens 2 and the color light image control plate 31, and a color filter 5A is arranged between the imaging lens 2 and the color light image control plate 31, and The hologram recording medium 8 is placed facing each other via the optical splitter 32 and the imaging lens 9 in this order.

In this case, the color light image control plate 31 is
Since the color light image control plate shown in the specification and drawings of No. 92 can be used, details thereof can be found in Japanese Patent Application No. 52-17392.
For example, Figure 4A
As shown in FIGS. 1A and 1B, the color stripe filter 4 described above in FIGS.
A transparent electrode 45, a transparent photoconductive layer 46, an electrically insulating light blocking layer 51, a dielectric mirror 52, a transparent optical layer 47 that provides an optical control effect according to the amount of electricity, and An optical image system 31 formed by stacking translucent electrodes 48 is stacked, as shown in FIG. 4B of Japanese Patent Application No. 17392/1982. The configuration described above in FIG. 4A is similar to that shown in FIG. 4A, except that a phase plate 53 is disposed between the light image control plate 31 and the substrate 42. It is possible to apply a device having a configuration. Then, the subject 1 is irradiated with white light LO, and the subject 1 is exposed in the same manner as described above in FIG.
A light image L1 is obtained from the side, and a color filter 5A is obtained from the light image L1.
The light image L2A is obtained through the light image control plate 31, and the light image L2A is made incident on the light image control plate 31.
A light image L3A (not shown) is obtained through a 2A color stripe filter 4, and this light image L3A is photoelectrically applied with a required bias applied from a bias power supply 54 between electrodes 45 and 48 of the light image control plate 31. The optical layer 4 is made to take an image on the conductive layer 46.
The optical control effect of 7 is controlled according to the optical image L3A,
Next, in such a state, the coherent laser beam L5 is passed through a polarizer 33 as required, as shown by the dotted line, and further transmitted to an optical splitter 3.
2, enters the color light image control plate 31 through the optical layer 47, is reflected by the dielectric mirror 52, and passes through the optical layer 47 again to obtain a light image L6A. Accordingly, the hologram recording reference beam L7A is projected onto the hologram recording medium 8 through the polarizer 34 and further through the Fourier transform lens 9, and the hologram recording reference beam L7A is projected onto the hologram recording medium 8. A first hologram recording is performed by interfering the image L6A and the reference light L7A.

Next, between the imaging lens 2 and the color light image control plate 31, a round color filter 5B is arranged in addition to the color filter 5A described above, and the subject 1 is irradiated with white light LO in the same manner as described above. , a light image L1 is obtained, a light image L2B is obtained from the light image L1 through a color filter 5B, and a light image L2B is further passed through a light image control plate 31.
A light image L3B (not shown) is made incident on the light image control plate 31 and passes through the color stripe filter 4 of the light fishing L2B.
This optical image L3B is projected onto the photoconductive layer 46 with a bias applied between the electrodes 43 and 48 of the optical image control plate 31 in the same way as described above, so that the optical capillary effect of the optical layer 47 is reflected. The laser beam L5 is controlled in accordance with the image L3B, and the laser beam L5 is made incident on the color light image control plate 31 in the same manner as described above, and the corresponding optical image L6B is obtained in the same manner as the optical image L6A described above. , the light image L6B is projected onto the hologram recording medium 8 in the same manner as described above, and the hologram reference light L7B is projected onto the recording medium 8, so that the light image L6B and the reference light L7B interfere with each other on the hologram recording medium 8. A second hologram record is made superimposed on the first hologram record, thus producing a color image record similar to that described above in FIGS. 1A and 1B.

As described above, other embodiments of the color image recording method according to the present invention have been clarified. According to such a method, color images can be recorded in the same way as in the case of FIGS. 1A and B. In addition to having the following characteristics, it also has the feature that it is possible to directly obtain a color image record without using a monochromatic optical recording medium and carrying out any development processing as in the case of FIGS. 1A and B. be.

Next, another embodiment of the color image recording method according to the present invention will be described with reference to FIG. 5. Parts corresponding to those in FIG. 3 will be given the same reference numerals, and detailed explanation thereof will be omitted. Also, the subject 1 is irradiated with white light LO to obtain a light image L1 from the subject 1 in the same manner as in the case of FIG. A light image similar to that obtained through a color filter that allows only the green light to pass through, thus the light described above in FIG. 1A? L3A
A light image L3A' similar to the above and a light image L3B' obtained through a color filter that blocks only the green light of the light image L1.
Then, the light image L3A'' is transferred to the color stripe filter 4 in the color light image control plate 31 mentioned above in FIG.
The light image L3A' is made incident on a color light image control plate 62 which is similar to the color light image control plate 31 described above in FIG. In the same way as in the case of 3A', the optical leg effect of the optical layer 47 is controlled according to the optical image L3A' by projecting it onto the photoconductive layer 46 with the required bias applied, and in this state, the laser beam L3A' is
5 is incident on the color light image control plate 62 through the light splitter 64, further through the polarizer 66 as necessary, and further through the reflection mirror 63, to form the light image L6A in the same manner as described above with reference to FIG. This is projected onto the hologram recording medium 8 via the reflecting mirror 63, polarizer 66, and optical splitter 64, and further via the Fourier transform lens 9, while the reference beam L7A is projected onto the recording medium 8. A first hologram recording is made by interfering the light image L6A and the reference light L7A, and at the same time, the light image L3D is made to enter the color light image control plate 31, in which the light image L6A and the reference light L7A are caused to interfere with each other. The optical image L3B is obtained in the same manner as in the case of FIG. 3, and the optical control effect of the optical layer 47 is controlled accordingly as in the case of FIG.
In addition, in such a state, the laser beam L5 is passed through the optical splitter 64,
Furthermore, if necessary, a reflective mirror 6 is provided via a polarizer 67.
5 to the color light image control plate 31.
A light image L6B is obtained in the same manner as described above in the figure, and this is imaged on the hologram recording medium 8 via a reflecting mirror 65, a polarizer 67, a light splitter 64, and a Fourier transform lens 9, while a reference beam is transmitted to the recording medium 8. A second hologram is recorded by projecting the light beam L7B onto the recording medium 8 by interfering with the light image L6B and the reference light L7B, thus recording a color image similar to that described above in FIG. 3.

In this case, if the color light image control plates 62 and 31 do not change the plane of polarization of light for which light scattering development is used, the directions of the planes of polarization of the polarizers 66 and 67 should be orthogonal to each other. If the color light image control plates 62 and 31 change the polarization plane of light using birefringence, the color light image control plates 62 and 31 may be Obtained optical images L6A and L
It is necessary to make the wavefront polarization planes of 6B orthogonal to each other. Other embodiments of the color image recording method according to the present invention have been clarified above, and in addition to being able to record color images in the same manner as in the case of FIG. 3, this method also has the following features: The first and second hologram recordings are not sequential as in the case of Fig. 3, but are simultaneous, so that a color image can be recorded more quickly than in the case of Fig. 3. It is. The above description has only shown a few examples of the present invention, and for example, in the configuration described above in FIG. 3 as shown in FIG. 6, the color light image control plate 31 is shown in FIG. The color light image control plate 62 described above is replaced, however, the light image L2A obtained through the color filter 5A first
Then, using the monochromatic image pickup tube 71, an electrical image signal E3A representing the optical image L2A is obtained, and this is sent to the color signal processing circuit 7.
2 to obtain an image signal E4A substantially similar to the image signal E3A, and a reproduced image representing information regarding the green light of the subject 1 based on this is transmitted to the television receiver 7.
3, a light image L3K similar to the light image L3A in FIG.
From this, a light image L6A is obtained in the same manner as in the case of FIG. 3, and then an electrical image representing the light image L2B is obtained using the monochromatic image pickup tube 71 from the light image L2B obtained through the color filter 5B. A signal E3B is obtained, which is supplied to the color signal processing circuit 72, and an image signal similar to the image signal obtained from this is obtained when the optical image L2B is projected onto the monochromatic image pickup tube 72 via the color stripe filter 4 mentioned above. An image signal E4B is obtained, a reproduced image representing information regarding the red and green lights of the subject 1 based on this is obtained by the receiver 73, and a light image L3W similar to the light image L3B in FIG. 74 to the color light image control plate 62 to obtain a light image L6B in the same manner as in FIG. Of course, it is also possible to record a color image by performing hologram recording of 2, and from the hologram recording medium 8 on which a color image is recorded as described above in FIGS. 3, 5, and 6. Color images can also be reproduced in a manner similar to that described above with reference to FIG. 2, and various other modifications may be made without departing from the spirit of the invention.

[Brief explanation of the drawing]

1A and 1B are system diagrams for explaining an example of the color image recording method according to the present invention, FIG. 2 is a system diagram for explaining an example of the reproduction method, and FIG. 3 is a system diagram for explaining an example of the color image recording method according to the present invention. FIGS. 4A and 4B are schematic diagrams showing an example of a color light image control plate used therein, and FIGS. 5 and 6 are system diagrams showing another example of the recording method according to the present invention. FIG. 7 is a system diagram showing still another embodiment of a color image recording method.

Claims (1)

[Scope of Claims] 1. A first light image in an embodiment in which the light image of the color image is obtained through a color filter for the first color light, and a light image of the color image is the first light image of the color image. and a second light image obtained through a color stripe filter for a second color light different from the color light of the first light image and the first reference light, and the second light image and the above A color image recording method characterized in that the color image is recorded by causing second reference beams having optical axes different from those of the first reference beam to interfere with each other to record a hologram. 2 From the light image of the color image, the light image of the color image is the first
The first aspect obtained through a color filter for colored light of
and a second light image in an embodiment in which the light image of the color image is obtained through a color stripe filter for a second color light different from the first color light, and The color image is recorded by interfering with each other the reference light of the first reference light, the second light image, and a second reference light having an optical axis different from that of the first reference light, respectively, to record a hologram. Then, from the hologram recording, first and second reproduction beams having mutually orthogonal polarization planes and a polarization splitter are used to generate a first beam corresponding to the first and second optical images.
and a second reconstructed optical image are obtained by spatially separating them from each other;
and a second reproduced optical image, using first and second monochromatic image pickup tubes, respectively, to obtain first and second electrical image signals corresponding to the first and second optical images; A color image recording method characterized in that an electrical color image signal corresponding to the color image is obtained based on a second electrical image signal.
Playback method.