JPS636859B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to provide a photo confirmation device that is convenient for use in photo studios and the like when taking photos.

For example, when photographing a person in a photo studio, it is impossible to know whether the person was photographed with his or her eyes closed. Therefore, in order to know this, it was thought to use a camera that can quickly develop images such as a Polaroid camera at the same time to find out whether the subject was photographed in good condition, but the Polaroid camera consumes the film. This is extremely uneconomical.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a photographic confirmation device that can economically confirm the photographic state of a subject.One embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a magnetic sheet memory 1 is provided so that a video signal from a television camera 2 for photographing an object can be recorded on this magnetic sheet memory 1. The output of this magnetic sheet memory 1 can be reproduced on a monitor television 3. A photo sensor 6 is provided to detect the light from the flash 5 of the camera 4 in order to provide a recording start signal for recording video signals from the television camera 2 in the magnetic sheet memory 1.
Add to. The magnetic sheet memory 1 is provided with a reset switch 7.

In the magnetic sheet memory 1, the center of a circular magnetic sheet is fixed to the shaft of a motor, and the magnetic sheet is rotated at a constant rotational speed, so that concentric recording tracks are formed by a plurality of heads in contact with the magnetic sheet. If the motor rotates once per TV field (approximately 1/60th of a second), the still image of the field will be displayed on the monitor TV 3.
can be obtained. In recording and reproducing fields, continuous horizontal synchronization is required, so the number of revolutions of the motor is set to an integral multiple of the horizontal period. Specifically, the motor was configured to rotate once every 260 horizontal scanning lines. The recording means for video signals in the magnetic sheet memory 1 is that the luminance signal is FM modulated, the color signal is converted to a low frequency, and each is recorded on separate tracks, except that both are recorded on separate tracks. Signal processing for recording and reproducing luminance signals and color signals can be performed using the same means as in video tape recorders. The procedure for recording and reproducing video signals on a magnetic sheet is to first erase one rotation period, then record,
After that, it will be regenerated. Also magnetic sheet memory 1
The magnetic sheet memory 1 has a function to select whether the output signal from the television camera 2 is a recording signal or a direct output signal from the television camera 2. The direct output signal of is applied to the monitor television 3.

In normal photography, the flash 5 flashes when the shutter of the camera 4 is pressed. The pulse period in FIG. 2a is the time during which the shutter of the camera 4 is open, which is approximately 1/60 second. The pulse period in FIG. 2b is the time during which the flash 5 flashes, and is, for example, about 1/200 second. The light from the flash 5 is detected by the photo sensor 6, and a signal that maintains the "H" level shown in FIG. 3d is obtained at the output terminal of the photo sensor 6. The television camera 2 is scanned with its own synchronizing signals, of which the vertical synchronizing signal is shown in FIG. 2c. Magnetic sheet memory 1 is photo sensor 6
The pulse period shown in Fig. 2 e, that is, 260
Recording is performed for a horizontal period and thereafter the recording is played back. By pressing the reset switch 17, the pulse shown in FIG.
become.

Although there is a difference in memory timing between the camera 4 and the television camera 2 only in the a pulse and e pulse shown in FIG. 2, there is no practical problem. Furthermore, in the television camera 2, an image is formed on the imaging surface during the pulse period shown in FIG. 2b by flashing light, and a readout signal during the pulse period shown in FIG. Therefore, it is necessary to open the aperture for focusing and framing of the television camera 2, and to close the aperture appropriately when shooting.

Furthermore, in order to shorten the interval between the pulses a and e in FIG. 2, the recording track on the magnetic sheet is erased for one field when the reset switch 7 is pressed.

Although the above description has been made using a one-field sheet memory, a semiconductor memory may also be used. Furthermore, since the accumulated charge of the television camera decreases over time, flickering may occur, but it can be configured with a single frame memory.

Instead of determining the timing of recording by detecting the flash of the flash, it may be possible to achieve this by inputting a mechanical signal that turns off the shutter to the magnetic sheet memory. In this case, if the shutter is turned off but the flash does not light up, the camera cannot take a picture, but the magnetic sheet memory 1 is defective and the image cannot be captured. will be recorded,
The problem is that it becomes a loss, which is not desirable.

In addition, the second
Figures a and e can eliminate the timing deviation of the pulses. This will be explained with reference to FIG. Figure 3a
is an instruction pulse for photographing issued from the magnetic sheet memory 1. Based on this pulse, after a certain period of time from the vertical synchronizing signal shown in FIG. 3b, the shutter of the camera 4 opens for the pulse period shown in FIG. 3c, and the flash 5 flashes for the pulse period shown in FIG. 3d. The image formed by the television camera 2 is then recorded in the magnetic sheet memory 1 in one field as shown in FIG. 3e. By doing this, the time interval from the flash of the flash 5 to the recording on the magnetic sheet memory 1 is constant, and the uneven brightness of the reproduced image is constant.

Furthermore, when photographing a large number of people, it becomes difficult to determine whether the eyes are closed or not in field recording. Therefore, it becomes necessary to divide the whole into two or three parts. In this case, by using a plurality of recording tracks in the magnetic sheet memory and a plurality of television cameras, it is possible to simultaneously record a plurality of images and sequentially play them back to check the state of the subject. When playing back, it is not necessary to display multiple images at the same time, but to play back one image at a time. Although a plurality of signal processing systems are required for recording, the reproduction system can be configured with one set.

There are semiconductor memories, magnetic sheet memories, etc. as image memories, but in terms of increasing the number of recording sheets, magnetic sheet memories are more advantageous in terms of cost because they only require an additional head and a recording signal processing system.

As described above, according to the present invention, since the video signal of the television camera that photographs the subject to be photographed by the camera is recorded in the recording means when the camera is photographing, by reproducing this recorded signal, It is possible to check whether the subject is being photographed by the camera in good condition, and this check can be repeated any number of times, making it extremely economical.

In addition, as a means of synchronizing the timing of taking pictures with a camera and the timing of recording images with a television camera, the light from the flash of the camera is detected and the detection signal is used to operate the magnetic sheet memory device. Compared to the case where the magnetic sheet memory is driven by a mechanical signal from the shutter being turned off, there is no need for a signal line between the camera and the magnetic sheet memory, and in this case the flash does not light up. However, according to the present invention, such problems do not occur, although images may be recorded in a defective form on a magnetic sheet memory.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a photographic confirmation device according to an embodiment of the present invention, FIG. 2 is a waveform diagram for explaining the same device, and FIG. 3 is a waveform diagram for explaining another embodiment of the invention. . 1... Magnetic sheet memory, 2... Television camera, 3... Monitor TV, 4... Photographer, 5...
Flash, 6...Photo sensor.

Claims (1)

[Claims] 1. A television camera for photographing the subject to be photographed by the camera, a magnetic sheet memory device for recording the video signal of the television camera, a timing for photographing by the camera, and a timing for recording the video of the television camera. a means of matching the
and a reproducing means for reproducing the recorded image of the magnetic sheet memory device, and as the means for adjusting the timing, means for detecting flash light from a camera and operating the magnetic sheet memory device with the detection signal is used. A photographic confirmation device characterized by: