JPS59815B2 - Image conversion projection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image conversion projection method for projecting a converted image obtained by inverting the pattern of a color negative film, for example, and for projecting three recorded images separated into three primary colors. Another object of the present invention is to provide an image conversion projection method that performs color adjustment of the three primary colors and reproduces a clear negative-positive inverted image close to the original image.

For conventional color image conversion, such as color conversion and inversion, methods using silver salts using photographic technology are common. In addition, there is a method in which image conversion is performed by changing the optical constants of the recording system and the reproducing system using a laser hologram. However, these methods have the disadvantage that the process of converting original optical information (such as an image) to an intermediate recording medium, and the process of converting from there to a final image are complex, expensive, and not immediate.

The present invention eliminates the conventional drawbacks and achieves the following objectives.

That is, the first object of the present invention is to eliminate color shift by using an optical system provided with three lens systems and an electro-optic memory element.
The object of the present invention is to provide an image conversion projection method that allows instant reproduction processing and obtains a clear negative-positive inverted image with high resolution.

Another object of the present invention is to provide an image conversion projection method J for obtaining a Naga positive inverted image with high color reproducibility of a color-converted reproduced image using an optical system using an electro-optic storage element.

Still another object is to provide an image conversion projection method for obtaining a negative/positive inverted image in which the inverted image of the original image can be simultaneously observed at a position different from the original image.

These objectives are achieved by providing the method described below.

Light is applied to the original image, and the pattern of this original image is passed through an optical system that passes through three filters corresponding to the three primary colors of the additive coloring method and a lens. Forming and recording three color-separated converted images of the pattern of the original image on an image recording unit made of a recording member having an electro-optical effect that changes the color so as not to overlap each other,
A front recording section is irradiated with light, a converted image of the original image is projected onto a Thrillen or the like through the optical system, and a color adjustment means for the projected image is provided, and the color adjustment means is adjusted to synthesize the three primary colors. It is something to do.

The present invention will be explained in detail below using the drawings.

FIG. 1 shows the basic configuration of the image conversion and projection method of the present invention.

In the figure, 1 is the original image, 2 is the optical system, 2 (1) is the lens, 2 (
2 is the color filter 1, R is the red filter 1, G is the green filter 1, B is the blue filter 1, 3 is the recording section, 3(1) and 3(4)
3(2) is a transparent electrode, 3(2) is a photoconductive layer, 3(3) is a recording member, 4 is a light source, and 5 is a reproduction light source. Optical information at the incident position of the original image 1 or two-dimensional information equivalent to the original image is illuminated by a light source 4 and projected onto an imaging unit 3 through an optical system 2.

This imaging section 3 includes a photoconductive layer 3 (2) and an electric field recording material 3.
There is a recording surface made up of layers (3), and transparent electrodes 3(1) and 3(4) are placed on both sides of this recording surface, so that a voltage can be applied between the two electrodes. Here, the above projected image is recorded on a layer of electric field recording material. Next, the recording surface on which the image has been recorded is illuminated by a reproduction light source 5, and a converted image of the original image is projected at position 1 through the same optical system 2. In the above configuration, the optical system 2 includes color filters 2 corresponding to the three primary colors of light.
(2) and a lens system 2 (1) that forms an image of the original image provided on each color filter 1. In the imaging section 3, the images from the respective optical systems are arranged so that they do not overlap with each other.

FIG. 2 is a diagram schematically showing the image formation state of the optical system through each filter. Figure A shows a state in which the images formed by the optical system through the valley filter do not overlap with each other.

Figures B and C show that the images formed by the optical system through the valley filter have at least an overlapping portion. The present invention is characterized in that the image formation state in the recording section is as shown in FIG. 2A, and as shown in FIG. 2B and C, the image formation of the optical system through each color filter is At least when there is overlap, the reproduction function is impaired.

In other words, in the imaging state shown in B and C in Figure 2, when there is overlapping colors, the original image is recorded in such a way that its brightness is dominated by the light component of the strongest color, and the color reproduction is difficult during playback. This is because it cannot be achieved.

FIG. 3 shows another example of the configuration of the recording method in the image conversion and projection method of the present invention, in which the recording surface is 3(a), 3(b), 3() corresponding to each filter. As shown in c), it is something that was created independently. This configuration has the feature that optical adjustments can be easily made during recording and reproduction. Here, a structural diagram of the recording section 3 is shown in FIG.

In the figure, 3(1), 3(4 are transparent electrodes, 3(Z is a photoconductive layer (for example, dye-sensitized polyvinyl carbazole), 3(
3 is a transparent recording member (for example, PZT-based transparent ceramics), and 3 (5) is a holding substrate having good transparency.
The recording section 3 includes a photoconductive layer 3 (2) and an electro-optic storage element 3 (
It consists of a recording surface made up of layers 3) and transparent electrodes on both sides, and has a structure that allows voltage to be applied to both electrodes.

In the recording section, a predetermined voltage is applied in advance to the recording surface where the photoconductive layer 3 (2) and the electro-optic memory element 3 (3) are stacked together via the transparent electrodes 3 (1) and 3 (4). .

When the projected image of the original image is formed on the recording surface, a bright and dark pattern based on the resistance change of the photoconductive layer is recorded in the electro-optic storage element. This recorded image is reproduced as a color inverted (positive) image by removing the voltage and using illumination light. Therefore, in this case, the electro-optical element is a memory element that retains the recorded image even when the voltage is removed.

If this electro-optical element does not have a memory property, since a photoconductive layer is used, the recorded image will be erased by the illumination light used to reproduce the image and cannot be reproduced. The electro-optical memory element used here is preferably made of a material that is thermally stable even when the voltage is removed after recording and has excellent light storage properties (memory properties) with little light absorption in the visible region.

For example, PZT-based transparent ceramics having memory properties are suitable materials for carrying out the present invention. Next, the first
The principles of recording and reproduction in the image conversion and projection method of the present invention will be described based on the drawings.

First, when light is applied to the original image 1 from the recording illumination light source 4, the red component passes through the red filter and is recorded on the recording surface, but the light is absorbed by the green and blue filters and does not reach the recording surface. .

The shading of the red component of the original image is recorded on the recording surface as a pattern with the shading reversed. On the other hand, the green and blue components do not reach the recording surface, so the recording surface does not change. Next, when light is applied to this recorded pattern from the reproduction light source 5 through the same optical system, the color passes through, the lights are combined, and a color-inverted image of the original image is reproduced at the original location.

In the image conversion projection method of the present invention, the recording pattern is
In order to reproduce colors with good color reproducibility, it is necessary to invert the light intensity of the color components of the original image to the same intensity as the valley color.

In this case, if the photoconductive layer has uniform photosensitivity characteristics in the entire visible light region, the inverted shading pattern of the original image will be recorded on the recording surface and the problem of color reproduction of the reproduced image will be solved. Although it may be small, if the photosensitivity characteristics of the photoconductive layer with respect to wavelength differ, the density pattern passed through each filter will have a relative difference in level of brightness, resulting in poor color reproducibility of the reproduced image.

However, since there are usually few photoconductive layers with a uniform photosensitivity distribution in the visible region, when using photoconductive layers with different photosensitivity distributions, color reproducibility can be improved by making the following adjustments according to the present invention. can. (1) The magnitude of the voltage applied to the electro-optic memory element is adjusted according to the photosensitivity characteristics of the photoconductive layer corresponding to the three primary colors. (2) Adjust using a neutral filter according to the photosensitivity characteristics of the photoconductive layer corresponding to the three primary colors.

(3) Adjust the light intensity of the reproduction illumination light by changing it according to the photosensitivity characteristics of the photoconductive layer corresponding to the three primary colors.

Hereinafter, the present invention will be explained in detail with reference to Examples. Example
1 In FIG. 1, an original image 1 such as a color film is illuminated by an illumination light source 4, and this image is sent to an imaging system as three images by three lenses 2 (1).

At this time, a red, green, and blue filter 2 (2) having separation characteristics as shown in FIG. 5 is inserted into the optical path to separate the basic light components and project them onto the recording section 3. has a superimposed structure of thin layers, with a photoconductive layer (dye-sensitized polyvinyl carbazole) 3(2) and PZT between transparent electrodes (indium oxide vapor-deposited film) 3(1) and 3(4).
Translucent ceramic (NdLi/Zr/Ti: 8/65
/35 thickness 200μ) 3 (3) was sanded and searched.

The operation of the recording section 3 begins with recording both electrodes 3 (1) and 3 in the dark.
During (4), apply 300V DC, then light source 4
(Halogen lamp 15V 1150W) is turned on for a short time to project the image of the original image 1 onto the photoconductive layer 3 (2).
High and low voltages occur in each area, and as a result, in areas where the applied voltage is high, the translucency of PZT ceramic 3 (3) becomes poorer than in other areas, forming a pattern with the opposite brightness and darkness from the original image 1. .This pattern remains even if the voltage application is stopped.Figure 6 shows the P (polarization) of the transparent dielectric ceramic.
-E (electric field) hysteresis curve.

As can be seen from the figure, once a voltage is applied, it is stored in memory even if the voltage becomes 0V. Furthermore, FIG. 7 shows the illuminance-photocurrent characteristics obtained when a recording section using the above-mentioned PZT-based transparent ceramic having the structure shown in FIG. 4 was irradiated with light using a tungsten lamp.

It is clear that this results in halftones. Among light-transmitting dielectric ceramics used as recording members, PZT-based dielectric ceramics exhibit a hysteresis curve as shown in FIG. 6, have a memory function, and have a good light-transmitting composition.

Nd-Li. La
、． La-Ba,. La-Sr,. BaBi,. La+
Those to which Al or the like is added have good characteristics. Next, move the original light image 1 and light source 4 to another location, and then move the light source 5 for reproduction.
is turned on continuously, and the pattern previously recorded on the PZT ceramic 3 (3) is passed through the optical system 2 in reverse to form an inverted image at the position of the original image.

Erasing of the recorded image in the above-mentioned Example 1 was carried out by using the transparent electrode 3 (4) (
Indium oxide vapor deposited layer 50Ω? ), the PZT-based translucent ceramic is instantaneously heated to 110° C. to 120° C. by Joule heat.

At this time, it is not necessary to apply a voltage between electrodes 3(1) and 3(4). As another erasing method, due to the characteristics of light-transmitting PZT-based transparent ceramics, instantaneous erasing is possible by applying a reverse voltage to the ceramics and at the same time heating the ceramics with light using a lamp with increased power. FIG. 9 shows the wavelength sensitivity characteristics of a photoconductive layer obtained by sensitizing brominated polyN vinyl carbazole (Br-PVK) with a benzopyrylium derivative.

Due to the wavelength sensitivity characteristics of the photoconductive layer, there is a sensitivity difference between the three primary colors R, G, and B, which requires color correction.

The recording section shown in FIG. 3 has a structure having three primary colors: a red recording section 3 (a), a green recording section 3 (b), and a blue recording section 3 (c). Each of the three recording sections is
It has the structure shown in FIG. 4, and transparent electrodes 3 (1), 3
(4) The recording voltage applied to R, G, B of the photoconductive layer is
until the relative intensities of

For example, the plate thickness of PZT-based transparent ceramics is 200 μm.
When a voltage of 300V was applied to the red recording section 3(a), the voltage of the green recording section 3(b) was 330V, and the voltage of the blue recording section 3c was 350V.

As described above, by changing the voltages applied to the recording sections corresponding to the three primary colors, color sensitivity correction was performed and the colors of the original image could be faithfully reproduced. Example 2 In the image conversion projection apparatus shown in Example 1, as another example of synthesizing recorded images separated into three primary colors, green is By inserting a neutral filter into the optical system when projecting red and red to reduce the amount of light during synthesis, the color of the composite image was adjusted and a clear composite image was obtained.

Example 3 As a color adjustment method other than that shown in Example 1 or 2, the emission peaks of the three primary colors of the reproduction light source are adjusted.

For example, by using a light source that emits light strongly in blue and green so that the light sensitivity of the photoconductive layer in FIG. 9 is corrected, it was possible to reproduce the composite image in colors close to the original image.

FIG. 8 schematically shows a negative color film reversal image conversion projection apparatus.

The optical system 2, the recording section 3, and the light source 5 are housed in the main case 7, and a screen 6 is slidably supported on the front window of the main case 7. Reference numeral 8 denotes a sub-case which supports the main case 7Vc so as to be openable and closable, and the sub-case 8 houses the lamp 4 and forms an original image holding portion into which the original image 1 is inserted.

The present invention has the above-described configuration, and according to the present invention, the following effects can be obtained.

(1) No color shift occurs.

When images that have been recorded separately in three colors are combined again to create a color image, normally these three images do not match perfectly.
Synthesis is incomplete and blurring appears, causing color shift.

This is due to deviations in the arrangement of the optical paths of lenses, etc., and due to differences in the characteristics of the respective lenses or reflective optical systems, and perfect synthesis is difficult. In contrast, in the present invention, the recording optical system from the original image to the image recording section is used as an image reproducing optical system to form an image by passing light in the opposite direction, so even if there are differences in the characteristics of each lens, the reproduced image No color shift appears. Further, in the present invention, the manufacturing cost is reduced because the three lenses do not have to be interchangeable. (2) Recording/playback processing is fast.

In recording systems such as silver salt, it takes 1 minute to 30 minutes for development and fixation, but according to the present invention, recording can be completed in a short time of 1 second or less by applying a voltage, and the reproduced image can be seen immediately. It will be done.

(3) Low running costs.

Since the electro-optical recording material of the present invention (eg, ferroelectric transparent ceramic) can be repeatedly recorded and erased, there is no part that is consumed during image conversion processing.

On the other hand, in recording systems such as silver salt, the recording medium cannot be reused. Furthermore, in the case of a laser hologram, a gas laser device is required, which makes the device itself expensive and the running cost high. (4) High resolution.

The electro-optical memory material of the present invention (for example, PZT-based transparent ceramic) has a density of 150 to 200 fibers/Mm.
, it is possible to obtain high-resolution recorded images.

In the present invention, since the recording optical system is directly used as a k-image reproducing optical system to form an image by passing light in the opposite direction, the reproduced image can also have high resolution like the recorded image. (5) Good color reproducibility.

The original image pattern is separated into three primary colors and each is recorded in an independent location without overlapping, so color adjustment when compositing is easy.
It is easy to do, and a reversed image close to the original image can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the basic configuration of the present invention, FIG.
B and C are schematic diagrams showing the state of image formation of the optical system through the valley filter, FIG. 3 is a schematic diagram of another embodiment of the present invention, and FIG.
The figure is a sectional view of the recording section of the present invention, and FIG. 5 is a wavelength separation characteristic diagram of the red, green, and Aoya filters used in one embodiment of the present invention.
FIG. 6 is a P (polarization)-E (electric field) hysteresis curve diagram of the recording material of the present invention, FIG. 7 is an illumination-photocurrent characteristic diagram of a recording section using the translucent PZT ceramic of the present invention, Figure 8 is a schematic diagram showing an example of a negative color film reversal (positive) image conversion projection apparatus according to the present invention, and Figure 9 is a wavelength sensitivity characteristic diagram when a sensitizer is added to Br-PVK of the photoconductive layer of the present invention. It is. 1...Original picture, 1 (2...Real image, 2...
...Optical system, 2 (1) ... Lens, 2 (2
)...Color filter 3...Recording section,
3(1), 3(4)...Transparent electrode, 3(2).
...Photoconductive layer, 3 (3) ... Transparent dielectric ceramics, 3 (5) ... Transparent substrate, 4,
5...Light source, 6...Screen, 7.
...Main case, 8...Sub-case.

Claims (1)

[Scope of Claims] 1. A light source that illuminates the original image, a color filter that separates the projected image of the original image into three additive primary colors, and a lens that forms the projected images so that they do not overlap with each other. an optical system, a recording member whose translucency changes in accordance with the brightness and darkness of the projected image of the original image and has an electro-optic effect for recording a converted image of the original image, and a reproduction member that shines light on the recording member. An image converting and projecting device comprising a light source and a screen for projecting an image projected by the reproduction light source, comprising a color adjusting means for the projected image and adjusting the color adjusting means to synthesize three primary colors. Transform projection method. 2. An image conversion and projection method according to claim 1, wherein the means for applying voltage to the recording member is color adjustment means. 3. In the image conversion projection method according to claim 1, neutral filters with different light transmittances provided according to the photosensitivity characteristics of the photoconductive layer of the recording member corresponding to the three primary colors are used as color adjustment means. Image transformation projection method. 4. In the image conversion projection method according to claim 1, an image in which a reproduction light source with different irradiation intensities provided according to the photosensitivity characteristics of a photoconductive layer of a recording member corresponding to three primary colors is used as a color adjustment means. Transform projection method.