JPH01102535A - Monitor image photographing device - Google Patents

Abstract

PURPOSE:To obtain a photograph which has erased a scanning line of a TV monitor of a satisfactory resolution without enlarging the diameter of a lens by simple constitution by providing a filter between a monitor and a film provided on a camera and setting the directivity of the filter to other direction than the scanning line direction of the monitor. CONSTITUTION:An image displayed on a monitor 2 is displayed by scanning lines 8... of an interval (p). This image is magnified by magnification beta by a lens system 3, made incident on a double refraction plate 4 after its light quantity is adjusted by a diaphragm 7, and by its double refraction plate 7, the optical path is divided into two pieces by a double refraction action, and its moving extent becomes (d). In such a case, d(p+beta)/2. As for a modulation transfer function MTF of the double refraction plate 4, when a space frequency (vy) in the (y) direction increases, the MTF of a crystal filter goes to '0' by some space frequency, and coincides with a frequency in the image forming surface of the scanning line 8 of the monitor, therefore, even when a screen of the monitor 2 is photographed, the scanning line 8 can be gradated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a monitor image photographing device for displaying a television (TV) monitor image on a film.

[Problems to be solved by conventional techniques and inventions] Conventionally,
When recording a monitor image obtained by a TV camera, etc., the monitor image is directly shadowed by a still camera, etc., but the monitor image is composed of 525 scanning lines regardless of the screen size. If this is taken with a still camera, scanning lines will be taken due to the high resolution of the film, making the resulting photo difficult to see. To deal with this problem
No. 5 discloses a technique for erasing scanning lines on a TV monitor by making the aperture of a camera lens rectangular or elliptical and changing the degree of blur in the horizontal and perpendicular directions of the TV monitor.

However, in the above-mentioned conventional technology, the shape of the diaphragm is rectangular or elliptical to reduce the amount of light, so a bright lens must be used, but changing the F number of the lens is difficult or complicated. . Furthermore, since the lens diameter is determined by the longitudinal dimension of the aperture formed in a rectangular or elliptical shape, the lens diameter becomes large, and there is also the problem that the image plane is not uniformly blurred.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and provides a monitor that has a solid structure and can obtain photographs with the scanning lines of a TV monitor erased without increasing the lens diameter. The purpose is to provide an image capturing device.

[Means and effects for solving the problem] A monitor image capturing device according to the present invention includes a filter disposed between a monitor and a film provided in a camera, and the directionality of the filter is set in a direction other than the scanning line direction of the monitor. This is the setting.

[Example] Hereinafter, an example of the present invention will be specifically described with reference to the drawings.

1 to 4 relate to a first embodiment of the present invention, in which FIG. 1 is an explanatory diagram of the outline configuration of a monitor image mirroring device, FIG. 2 is an explanatory diagram of scanning lines, and FIG. FIG. 4, which is an explanatory diagram of refraction, is a characteristic diagram of a modulation transfer function.

The monitor image display W11 includes a monitor 2 capable of displaying an image, a lens system 3 on the central axis of the monitor 2 that effectively removes distortion and has a magnification β, and a lens system 3 installed behind the lens system 3. a birefringent plate 4 made of a material such as quartz; a film 6 provided at the imaging position of the lens system 3; and an aperture 7 provided in the lens system 3 to narrow down the light ω. It is composed of.

By the way, the operation of the monitor image photographing device configured as described above will be explained.

The image displayed on the monitor 2 is displayed by scanning lines 8 at intervals p as shown in FIG. This image is magnified by a magnification β by a lens system 3, the amount of light is adjusted by an aperture 7, and the image enters a birefringent plate 4. In this birefringent plate 4, the optical path is divided into two by the birefringence effect, and the amount of movement thereof is d. Here, the interval p of the scan 88 and the shift! l
The relationship with 1md is as shown in the following equation.

d-(oxβ)/2 The above formula shows that by setting the movement lad to 1/2 of the scanning line spacing p, an optical image is formed on the film 6 by twice the number of scanning lines 8 as on the monitor 2. represents something to do.

By the way, the modulation transfer function (hereinafter abbreviated as MTF) of the birefringent plate 4, for example, a crystal filter, is such that as the spatial frequency vy in the y direction increases, the MTF of the crystal filter increases at a certain spatial frequency as shown in FIG. It is set to be 0. The frequency at which this MTF becomes 0 (cutoff frequency) is the reciprocal of the movement ff1d, that is, the scan 4 of the monitor 2.
The frequency coincides with the frequency at the image plane of No. 18.

As described above, according to this embodiment, even if the screen of the monitor 2 is shaded by m, the scanning line 8 can be blurred, and an easy-to-read photograph can be obtained.

Also, since the aperture 7 is not fixed, the F of the lens system 3
It is easy to change the number and change the brightness using the lens system 31m.

Furthermore, the image plane is uniformly blurred, and the lens diameter can be reduced.

5 to 8 relate to the second embodiment of the present invention, and FIG.
The figure is an explanatory diagram of the outline configuration of the monitor image capturing device, Figure 6 is a front view of the phase filter, Figure 7 is a one-way A-A arrow diagram of Figure 6, and Figure 8 (a) is the screen Explanatory diagram of scanning lines, No. 8
Figure (b) is an explanatory diagram of scanning lines on the film.

The monitor image capturing device 1 includes a monitor 2 that can display images, a lens system 3 on the central axis of the monitor 2,
A film 6 provided behind this lens system 3 and provided at an image forming position of the lens system 3, and an aperture 7 provided within the lens system 3 for adjusting the amount of light; A phase filter 11, such as a diffraction grating, is provided.

The phase filter 11 is formed by forming a thin film 13 on one side of a transparent plate 12 in a striped manner as shown in FIGS. It is vapor deposited. The direction in which this lII113 is formed is
It is arranged parallel to the scanning line 8 of the monitor 2. The pitch of the film 13 is determined so that the scanning lines 8 are closely spaced on the film 6 as shown in FIG. 8(b).

By the way, the monitor image capturing device 1 configured as described above
Explain the effect of

Scanning monitor 2! The light R 28 is displayed at regular intervals as shown in FIG.

In this phase filter 11, the light incident on the thin film 13 is given a phase difference of 1/2 or an odd number times the light incident directly on the transparent plate 12, and as a result, it is focused on the film 6 by the diffraction effect. The images of the scanning lines 8 are displayed with close intervals as shown in FIG. 8(b).

In this case as well, the scanning line 8 can be blurred by matching the spatial frequency at which the MTF becomes 0 on the imaging plane due to diffraction with the frequency of the scanning line 8 on the imaging plane of the monitor 2.

Note that the pitch of the thin film 13 may be changed depending on the hue of the image on the monitor 2 or the overall color strength.

That is, if the image is reddish, a phase difference of 1/2 or an odd number multiple may be given to the red wavelength.

Further, the phase filter 11 may be positioned at any position t such that the scanning lines 8 on the film 6 are closely spaced.

According to this embodiment, the scanning line 8 can be blurred by the diffraction effect.

Other effects are similar to those of the first embodiment.

"Effects of the Invention" As described above, according to the present invention, it is possible to obtain a photograph with a simple configuration, without increasing the lens diameter, and with good resolution without the scanning lines of a TV monitor.

[Brief explanation of the drawing]

FIGS. 1 to 4 relate to a first embodiment of the present invention.
The figure is an explanatory diagram of the general configuration of the monitor image capturing device, Fig. 2 is an explanatory diagram of scanning lines, Fig. 3 is an explanatory diagram of birefringence, Fig. 4 is a characteristic diagram of modulation transfer function, and Figs. The figures relate to a second embodiment of the present invention, FIG. 5 is a schematic configuration explanatory diagram of a monitor image capturing device, FIG. 6 is a front view of a phase filter, and FIG. 7 is a direction taken along line A-A' in FIG. The arrow view, FIG. 8(a) is an explanatory diagram of scanning lines on a screen, and FIG. 8(b) is an explanatory diagram of scanning lines on a film. 1... Monitor image photographing device 2... Monitor 3... Lens system 4... Birefringent plate 6... Film 8... Scanning line Jj. I Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 (.) (b) Procedural Nem official text (spontaneous) January 19, 1985 2. Name of the invention Monitor image 11 & 1m shadow device 3. Amendment Relationship with the case of a person who does 7. Contents of the correction As shown in the attached document 1. Lines 12 to 14 of page 5 of Mei 1111 read, "Frequency (cutoff frequency)... is designed to match." The frequency (cutoff frequency) is made to match the reciprocal of twice the amount of movement d, that is, the frequency 1/(pXβ) on the imaging plane of the scanning line 8 of the monitor 2. Expressing this, if the cutoff frequency is νC, then νc −1/ (2d) −1/ (pxβ
). ” will be corrected. Figure 4 TF

Claims (3)

[Claims] (1) a television monitor; an optical system that forms an image of the television monitor on a film; and an optical system that is arranged between the film and the television monitor and that controls the brightness of the scanning line of the television monitor. A monitor image photographing device comprising: a filter having filter characteristics that visually eliminates differences; (2) The monitor image photographing device according to claim 1, wherein the filter is a birefringent plate. (3) The monitor image photographing device according to claim 1, wherein the filter is a diffraction grating.