JP2742424B2 - Image shooting and projection equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image photographing / projecting apparatus for photographing an image displayed on a display on a recording medium such as a film or on a projection medium such as a screen.

2. Description of the Related Art A display device using the afterimage characteristic of the human eye is widely used as a display device such as a cathode ray tube generally used for consumer use.

In other words, one image is formed by continuously scanning one-dimensional image data over one field / frame along a scanning line, while one image is formed by human eyes due to the persistence characteristics. Will be recognized as In order to improve this recognition, a long-afterglow type phosphor is used for a cathode ray tube or the like of a display device.

A photographing device is used to obtain a hard copy of the image displayed on the display device, and a projection device is used to enlarge and display the image on a screen.

By the way, in recent years, a need for higher image quality has increased, and it has been desired to obtain a clearer image. However, it is difficult to dramatically improve the quality of an image that can be displayed on a consumer display device due to the video signal standard.

For this reason, the present applicant has filed Japanese Patent Application No. 62-136980,
We have proposed a device that can obtain a high quality captured or projected image from the image displayed on the display device. This device obtains a photographed or projected image by temporally shifting a display image displayed on a display device or a synchronization signal that determines a display timing, and guiding a plurality of shifted pixels to a spatially shifted location. It forms a time / space shift photography / projection method.

[Problems to be Solved by the Invention] In the case of a display device using a long-persistence phosphor as described above, the above-mentioned device is an envelope of an image photographed on a film or an image reproduced on a screen. Is not reproduced, and a phenomenon that the resolution improving ability is reduced occurs. In addition, not only the resolution improvement ability is reduced, but each adjacent R, G, B phosphor causes unnecessary color mixing on the film or screen,
The color purity of the photographed or projected image may be reduced.

The operation of the above-described apparatus when a long-persistent phosphor is used will be described below. Fig. 5 shows a long afterglow CR
This shows how the image displayed on the screen of T is formed on a film by the "time-space shift photographing method".

In FIG. 5, (a), (b), and (c) show one time and space shift repetition pattern, and (a-1, b-1, c-1) in FIG. Signal level versus time, (a-2, b-2, c-2) shows CRT tube brightness versus time, (a-3, b-3, c-3) shows film exposure Shows level versus film horizontal distance.

Now, when an image is formed on the film surface based on the time and space shift photographing / projection method in the sequence of (a) → (b) → (c), the input signal in FIG. Point A (assuming that the level is 1.0) passes through the shadow mask 2 and hits the phosphor 3 of the CRT, and the light-emitting luminance level K is determined by a certain factor (tentatively K) in the luminance of the tube surface. Emits light.

The emitted light beam on the CRT surface passes through the parallel optical movement system 4 and is exposed as A ″ in FIG.

Next, in the sequence of (b), as shown in FIG. (B-1), the input signal passes through the shadow mask 2 so as to be temporally shifted by Δt1 and input to the display (color CRT in this case). The input signal data to be
The point B is shifted from the data by the time Δt1. Now, if the level 0.5 signal at point B reaches the surface of the phosphor 3 of the CRT, it should emit light at a light emission luminance level of 0.5K in FIG. Since the long afterglow phosphor 3 emitted in the sequence (a) has the afterglow characteristic shown by the dotted line, in the sequence (b), the emission luminance at the point A is 1 / α, and the emission is K / α. The amounts are mixed in (b-2). That is, the light emission amount is K / α + 0.5K. In this figure (b-2), a light beam having a light emission amount to which the luminance at the current point A has been added passes through the parallel movement optical system 4 and Δx ₁
Then, the light path is shifted by B, and an exposure point adjacent to A ″ in FIG. At this time,
The exposure amount of B ″ includes the exposure amount of A ″ this time without completely attenuating.

Next, in the sequence of (c), as shown in (b-1), the input signal is shifted in time by Δt2 in FIG. Is point C, which is data adjacent to point B.

Now, if the input signal level at point C is zero, the luminance level on the CRT screen shown in (c-2) should be virtually zero, but using a long afterglow phosphor. (B), the emission luminance generated in the sequence (b) remains as a certain attenuation characteristic 1 / α as shown by a dotted line.
A light emission luminance of (1 / α) (K / α + 0.5K) is generated as shown in FIG. (C-2), and this light beam is optically shifted by Δx ₂ by the parallel movement optical system 4, and FIG. Exposure is performed as C ″ as shown in FIG. 3C. In FIG. 3C, the state of image formation on the film after the sequence of (a) → (b) → (c) is seen. Reproduced envelope (A "-B"
−C ″) is significantly different from the envelope (shown by the dotted line) that should be reproduced, and an image of the input signal is not formed on the film.
This results in a phenomenon that the resolution improving ability is reduced, and the color reproducibility is also reduced.

The present invention has been made in view of the above points, and an object of the present invention is to provide an image photographing / projecting apparatus capable of photographing or obtaining a projected image without deteriorating the resolution improving ability and the color reproducibility.

[Means for Solving the Problems and Action] In the present invention, in the conceptual diagram shown in FIG. 1, an input signal passes through a memory unit 11 for supporting a moving image. Input to the time shift unit 12 directly (without passing through the unit 11), and periodically (delayed or advanced) by the short time Δt, the short afterglow type display 13
Is input to Between the short afterglow display 13 and the photographic film 14, which emit light in response to the input signal, the optical path translation having the function of translating the optical path coincident with the period of the time Δt. An optical system 15 is provided, and a display 13
Exposes the film 14 as a recording medium through the translation optical system 15.

The time shift unit 12 and the optical path translation optical system 15 are controlled by a time / optical path shift control unit 16 that outputs a control signal based on a synchronization signal.

A short afterglow display characteristic is realized by using a phosphor 17 having a short afterglow characteristic on the display surface of the short afterglow display body 13.

By using the phosphor 17 having the short afterglow characteristic, an image can be formed on a photographing or projecting surface without overlapping adjacent data of an input signal, and photographing or projecting with high resolution and good color reproducibility can be achieved. Implement the device.

EXAMPLES Hereinafter, the present invention will be described specifically with reference to the drawings.

2 and 3 relate to an embodiment of the present invention, FIG. 2 shows a specific configuration of the embodiment, and FIG. 3 is for explaining the operation of the embodiment.

An image photographing apparatus 21 of the first embodiment shown in FIG. 2 converts an R, G, B color signal input from each input terminal into an A / D converter.
After conversion into, for example, n-bit quantized data at 22, R
, G, and B frame memories (or field memories) 23R, 23G, and 23B.

The SYNC signal is input to the H / V separation unit 24 and separated into a horizontal (H) yellow signal and a vertical (V) synchronization signal.
Memory controller 25 and the minute time (shown by Delta] t _k) · micro optical path (shown by [Delta] x _K) is input to the control unit 26. The above memory unit 25
Controls writing and reading to and from the frame memories 23R, 23G and 23B. The Δt _K / Δx _K control unit 26 controls a minute time (Δt _K ) delay unit 27, and stores the frame memories 23R, 23R.
It controls that data read from G, 23B is periodically (here, in accordance with the frame period) delayed by k stages based on the H synchronization signal. The signal delayed by the Δt _K delay unit 27 is subjected to gradation correction through R color, G color, and B color correction units 28R, 28G, and 28B, and gray balance correction is performed. After that, each is converted into an analog value by the D / A converter 29, and is then input to the short persistence color CRT 30,
Light is emitted on the surface of the phosphor 31 having a short afterglow characteristic to display a color image.

The luminance on the color CRT 30 is input to the optical path horizontal movement optical system 33 via the lens 32. The optical path horizontal moving optical system 33 periodically moves the optical path in k stages in the horizontal direction.
The luminance exiting the optical path horizontal movement optical system 33 is exposed on the film 35 when the shutter 34 is opened.
The R, G, and B color correction units 28R, 28G, and 28B correct the gradation so that the respective gradation characteristics on the film 35 are optimized. R,
When the G and B inputs have the same ratio, the gray balance is corrected so that the film 35 is reproduced white.

In the vicinity of the film 35, a photometric element 36 is provided.A photometric signal of the photometric element 36 is input to an exposure control unit 37, and a shutter 34 is opened for an appropriate exposure time with respect to the film 35. Control to expose 35.

The optical path horizontal movement optical system 33 uses, for example, two right angle prisms 38, 38, and is mounted so that piezo piezoelectric elements 39, 39 are sandwiched between the slopes of the prisms 38, 38. These piezoelectric elements 39, 39, by the thickness is changed in accordance with the signal level of the [Delta] x _K control signal from Δt _K · _{Δx K} controller 26, in the horizontal direction (FIG. 2 of the two prisms 38 and 38 The horizontal direction is the vertical direction in the paper plane).
One in the piezoelectric element 39, 39 Ili, [Delta] x _K corresponding amount by horizontally moving the input light.

The Δt _K / Δx _K control unit 26 controls the optical path horizontal movement optical system 33 interposed between the lens 32 and the shutter 34 to periodically move the optical path by Δx _K horizontally in synchronization with the delay of Δt _K. .

The components of the water channel horizontal moving optical system 33, anything may not limited to those described above if the optical path horizontally those stepwise translated by [Delta] x _K.

According to the above configuration, the input signal is periodically time-delayed and input to the color CRT 30, and the luminance emitted from the phosphor 31 surface of the color CRT 30 is synchronized with the time-delayed cycle by the optical path horizontal movement optical system 33. By moving the optical path horizontally and printing it on the film 35, a small color CRT30 can be used even if the resolution is not high.
Is used to capture an image with high resolution and a black matrix pattern erased.

 The operation of the above configuration will be described below with reference to FIG.

In FIG. 3, (a), (b), and (c) each show one time-space shift repetition pattern, and (a-1), (b-1), and (c-1) (A-2), (b-2), (c-2) indicating the input signal level versus time.
Indicates the screen brightness of the CRT versus time, and (a-3), (b-
3) and (c-3) show the exposure level on the film surface versus the horizontal distance of the film.

Now, when an image is formed on the film surface in the sequence of (a) → (b) → (c) based on the time and space shift photographing method, the point A of the input signal in FIG. Passes through the shadow mask, and is emitted as the emission luminance level K on the screen of the CRT in FIG. The emitted light passes through the translation optical system and is exposed as A. Next, in the sequence of (b), as shown in FIG. (B-1), in order to input the signal while shifting the input signal by Δt1 in time, the input signal data passing through the shadow mask is A
The point B is next to the point. At point B, a level signal of 0.5 reaches the fluorescent tube of the CRT.
2) In the figure, a light emission level of 0.5K emits light. B
In point, unlike the conventional long afterglow type phosphor, a short afterglow phosphor is used. With the afterglow characteristic shown by the dotted line, the emission luminance before the operation becomes almost zero before proceeding to the next sequence. Therefore, since no emission energy in the sequence of the previous (a) mixing in view (b-2), only the light emission quantity of 0.5K passes through the horizontal movement system, after being optical path shifted by [Delta] x ₂ , (B-3)
The point B in the figure is exposed at an exposure level of 0.5K.

Similarly, in the sequence (c), (b-1)
As shown in the figure, in the figure (c-1), the input point passing through the shadow mask is point C adjacent to the point B because the input signal is input after shifting the time by Δt ₂ and (c) -2) As shown in the figure, zero level, that is, nothing is emitted on the CRT tube surface. At this time, as described in the sequence (b), the CR in the previous sequence (b) was used.
The luminance emitted on the tube surface has been attenuated sufficiently at the time of the sequence (c) due to the use of a short afterglow phosphor.
In this sequence (c), the light emission amount becomes zero without mixing the light emission amount on the tube surface. Thus, the information of (c-2), is the optical path shift by [Delta] x ₂ by horizontally moving the optical system, (c-
3) Exposure as C as shown in the figure.

Thus, after the sequence of (a) → (b) → (c) in FIG. 3, image formation on the film surface A-
BC, and the amount of light emission in the previous sequence can be almost neglected because of the use of a phosphor having a short image light characteristic, and AB as shown in FIG. 3 (c-3). -C
To form an envelope.

This means that the image of the input signal is faithfully reproduced, and the distortion of image formation that occurs when a phosphor having a long afterglow characteristic shown in FIG. 5 is used can be greatly improved.

Also, by using the phosphor having the short afterglow characteristic,
Even when light is emitted in each color, the light emitted last time is attenuated during the next shift and has no effect, so that color reproducibility can be improved.

 FIG. 4 shows a configuration of a main part of a second embodiment of the present invention.

While the first embodiment shown in FIG. 2 shifts in time and space in the horizontal direction, this embodiment shifts in the horizontal and vertical directions.

Therefore, a vertical movement optical system 41 having the same structure as the horizontal movement optical system 33 shown in FIG. 2 is provided adjacent to the horizontal movement optical system 33.

In this case, the horizontal moving optical system 33 and the vertical movable optical system 41 by Δt _K · _{Δx K} · Δy _K controller 26 '[Delta] x _K and Δ
A Δx _K · Δy _K control signal for shifting by y _K is applied.

For example, a horizontal shift Δ
When x ₁ · Δx ₂ ··· is performed, the same shift is repeated for Δy ₁ · Δy ₂ ··· in the vertical direction, and a high-resolution color photographed image can be generated in the horizontal and vertical directions.

In addition, for the video signal in the vertical direction, color CR
Signals of an integral multiple of the display resolution of T30 are stored in memory 23R, 23G, 2 in advance.
The data may be stored in the memory 3B and displayed sequentially in accordance with the number of scanning lines, or may be sequentially displayed in the memories 23R, 23G and 23B.

In the above embodiment, a color CRT is used as the display means. However, the present invention is not limited to this. For example, a liquid crystal device may be used. The amount of light may be shortened, and the other display means may be any display means capable of almost ignoring the light emission amount in the previous sequence during the time until the next sequence of the time / space shift method. .

Further, the present invention is not limited to connecting the image displayed on the display means to a recording medium, but is also applicable to an apparatus for forming a projected image such as a screen.

Further, according to the present invention, the image signal input to the display means may be shifted, or the synchronization signal side may be shifted instead.

[Effects of the Invention] As described above, according to the present invention, a time-shifted image is displayed on the display means having a short persistence characteristic, and an image on a recording or projection medium is spatially shifted. Since a photographed or projected image is formed, a high-resolution image can be reproduced by eliminating mixing with adjacent pixels.

[Brief description of the drawings]

FIG. 1 is a conceptual block diagram of the present invention, FIGS. 2 and 3 relate to a first embodiment of the present invention, FIG. 2 is a block diagram of the first embodiment, and FIG. 3 is a first embodiment. FIG. 4 is a block diagram showing a main part of a second embodiment of the present invention, and FIG. 5 is an operation explanatory diagram of a related art example. 11: memory section, 12: time shift section 13: short afterglow type display, 14 ... film 15: optical path translation optical system 16: time / optical path shift control section 17: short afterglow characteristic Phosphor

Claims (1)

(57) [Claims] 1. A time shift means for time shifting at least one of an image signal and a synchronizing signal, a display means for displaying an image signal controlled by the time shift means, and an image displayed by the display means. An image characterized by having a recording or projection medium on which an image is formed, and position shift means for shifting a relative position of an image on the medium, wherein the display means is constituted by a display device having a short afterglow characteristic. Photographing and projection equipment.