JPH0640184B2 - Image recording / playback method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording / reproducing system, and more specifically, it extracts a video signal from a photographic image obtained by developing an exposed photographic film to obtain another signal such as a magnetic sheet. The present invention relates to an image recording / reproducing system intended for recording on a recording medium, reproducing a video signal from the recording medium, and displaying an observation image of the photographic image on a CRT screen.

[0002]

2. Description of the Related Art In a recently proposed electronic still camera, a standardized magnetic sheet such as a still video floppy is used in place of a conventional silver halide photographic film (hereinafter referred to as a photographic film) to capture a photographed image. Magnetic recording is performed on the magnetic sheet as a video signal. A magnetic recording band of 50 tracks is set on this magnetic sheet,
By performing field recording for each track, video signals for up to 50 frames can be recorded. Then, the recorded magnetic sheet is applied to a reproducing device to reproduce the video signal, and the video signal is input to a television receiver, so that a maximum of 50 captured images captured by an electronic still camera can be observed. According to such an image recording / reproducing system, unlike a conventional photographic system, there is no need to develop or print the photographic film in a dark room after taking a picture, and even with a general television receiver. This is advantageous in that images can be easily reproduced, and by continuously reproducing a series of still images, it becomes possible to reproduce images with motion.

By the way, in the above-mentioned electronic still camera, it seems that the present technology is used for a broadcasting TV camera or the like as an image pickup device such as an image pickup tube or a solid-state image pickup device, which is used because of cost and weight constraints. It is difficult to use a high quality product. Therefore, in order to put the above-mentioned electronic still camera system to practical use, the actual situation is that problems remain in terms of resolution and image quality. One method proposed by the applicant of the present invention to solve this problem is to form a photographic image on a photographic film by a conventional photographic system which is sufficiently satisfactory in terms of resolution and image quality, and a professional photographic processor A method of re-recording the video signal on a magnetic sheet by using a high quality image pickup device (for example, a conventional DPE processor may be substituted). When a video signal is reproduced from the magnetic sheet thus obtained, a considerably high quality image can be observed on the television receiver. According to such a method, even if a conventional photographic camera is used to easily take a picture, not only a high-quality image can be reproduced by the television receiver, but also the taken photographic image is converted into an electronic still image. By recording on a magnetic sheet of the same format as the camera system, it is convenient because the image can be reproduced by a common reproducing system.

[0004]

By the way, recently, in a so-called 35 mm camera using, for example, a JIS: 135 type photographic film, the photographic film loaded in the camera is continuously wound in advance before photographing. A pre-roll-up type photographic camera is being put into practical use in which an exposed photographic film is rewound one frame at a time in a patrone after being wound up on a take-up spool. In such a camera, unlike a normal photo camera, shooting is sequentially performed from the rear end side of the photo film. Therefore, in the exposed photographic film photographed by such a pre-roll-up type photographic camera, when the video signal is recorded on the magnetic sheet according to the above-mentioned method, the photographic film photographed by the ordinary photographic camera is Differently, each frame is recorded on the magnetic sheet in the reverse order of shooting, and the image is displayed in that order even when the image is reproduced. For this reason, there arises a problem that the lapse of time cannot be reproduced from the photo film taken by the pre-roll-up type photo camera. This problem is an inevitable drawback, especially when the photographer performs a large amount of processing by the above-described processing system that does not participate in recording on the magnetic sheet.

The present invention has been made in view of the above-mentioned technical background, and when a process of recording a video signal from a photographed film and recording it on a magnetic sheet is performed, the photographing order is reproduced. It is an object to provide an image recording / reproducing system having a function that is easy to perform.

[0006]

In order to achieve the above-mentioned object, the present invention is to continuously wind up a photographic film loaded in a camera in advance on a take-up spool before taking a picture.
A display signal indicating that the exposed photo film has been used by a pre-roll-up type photo camera that rewinds the exposed photo film frame by frame in a patrone is recorded on the photo film surface by this camera. After the film is developed, it is determined whether or not there is a display signal representing a pre-rolling type attached to the photographic film when the photographic image of the film is converted into a video signal and recorded on a recording medium. If the above is obtained, the recording order of the photographic image is reversed and recorded.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1 showing a state in which a back cover 11 of a pre-roll-up type 35 mm camera is opened, a Patrone 3 in which a JIS: 135 type photographic film 4 is wound is loaded in a Patrone loading chamber 2. . As shown in FIG. 2, a conductive cord arrangement portion 10 known as a DX cord system is provided at a required portion of the outer wall of the cartridge 3. Photo film 4 drawn from Patrone 3
The tip side of the
It is automatically sent to the winding chamber 5 side, and the winding spool 15
(See FIG. 2).

Two light irradiating parts 8 and 9 made of LEDs are provided facing the traveling path of the perforation 7 of the photographic film 4.
Is provided. The one light irradiating section 8 irradiates the back cover 1 with light having a wavelength which the photographic film 4 does not sensitize, such as infrared light.
It irradiates toward the light receiving part 14 provided in 1. And
The light receiving unit 14 detects the number of passing photographic films 4 passing through the perforations 7. The other light irradiation unit 9
Emits light to which the photo film 4 is exposed, and exposes it outside the range of the effective photographing screen 4a of the photo film 4.

In the film winding control system 2 of the camera shown in FIG. 1, when the cartridge 3 is loaded in a predetermined state and the back cover 11 is closed, the film loading detection section 20 is activated and DX The code detector 21 is operated for a predetermined time. After the DX code detecting section 20 is operated, information such as the type of the film loaded in the camera, the film sensitivity, the number of photographable images, and the allowable exposure range is read from the code array section 10 and decoded. Each is stored in a memory provided separately. Information regarding the number of shootable images is set up in the counter 22. The information on the number of sheets set up in the counter 22 is displayed on a display device 23 made of, for example, a liquid crystal or the like.
It constitutes a subtraction type counter that subtracts the count value of the counter 22 every time photographing is performed.

A signal from the film loading detector 20 activates the motor drive circuit 25. As a result, the motor 26 is driven, the drive transmission system 27, and the switching device 28.
The take-up spool 15 is rotated via the. At this time,
The switching device 28 is in the state shown by the solid line, only the take-up spool 15 is driven, and the cartridge shaft 3a of the cartridge 3 is in a free state. As a result, the unexposed film 4 is continuously taken up by the take-up spool 15 and preliminarily wound up. However, since the trailing end of the photographic film 4 is fixed to the cartridge shaft 3a, the prewinding is completed. A great load is generated on the drive system of the take-up spool 15. This load is detected by the spool winding load detection circuit 30, and a drive stop signal is sent to the motor drive circuit 25 by the detection signal, and the motor 26 is stopped. At the same time, the switching device 28 is switched to the position shown by the dotted line in the figure, and the drive of the motor 26 is now transmitted to the spool shaft 3a.

Thereafter, photographing is performed and the shutter operating circuit 3
When 2 is activated and an exposure completion signal is generated, the motor drive circuit 25 is activated to drive the motor 26 and the spool shaft 3a is rotated. As a result, the exposed photographic film 4 is wound around the spool shaft 3a. During this time, the light irradiation unit 8 is irradiating the traveling path of the perforation 7 with light, so that the light receiving unit 14 is irradiated with pulsed light every time the perforation 7 passes. The number of pulse outputs thus obtained from the light receiving unit 14 is counted by the perforation counting circuit 34. When eight pulses are counted by the perforation counting circuit 34, the one-frame indexing circuit 35 operates and sends a motor stop signal to the motor drive circuit 25. Therefore, the motor 26 is stopped and the traveling of the film is stopped. It In the 35 mm full-size camera, since the photographing screen of one frame is set for every eight perforations 7, only the exposed film is wound into the cartridge 3 by the above-mentioned operation.

The 1-frame indexing circuit 35 sends a subtraction pulse to the counter 22. That is, the number of shootable images counted by the counter 22 is decremented by 1 for each shooting. In this way, shooting continues, and when the count value of the counter 22 becomes “0”,
The timer 36 is activated. Then, the motor drive circuit 25 is operated and the motor 26 is driven only for the time preset in the timer 36, so that the leading end of the film 4 is wound into the cartridge 3 and after the photographing is completed, the conventional film winding is performed. The patrone can be taken out as it is without performing the returning operation. The switching device 28 is returned to the position indicated by the solid line in the figure by the timing end signal of the timer 36. Therefore, when the cartridge 3 is taken out, the initial state is restored.

In addition to the control system of the pre-roll-up type camera described above, in the photographic camera of the present invention, the light irradiation section 9, the lighting control circuit 40 for operating the light irradiation section 9, and the signal from the film loading detection section 20 are activated. And a timer 42. As a result, the film loading detection unit 20 detects the completion of the film loading, and at the same time the pre-winding is started, the light irradiation unit 9 is operated by the lighting control circuit 40 for a predetermined time set in the timer 42. . Therefore,
The front end side of the photographic film 4 is exposed in a band shape, and when this photographic film is developed, as shown in FIG. 3, a length corresponding to the time set in the timer 42 is set. The strip exposure unit 50 appears. The exposed portion 51 is a fog exposed portion exposed to the outside of the cartridge in the unused state of the film.

In FIG. 4, which shows an outline of an apparatus for extracting a video signal from a photographic image taken on the photographic film 4 and recording it on a magnetic sheet, the photographic image formed on the photographic film 4 after development processing. Is illuminated by a light source 45 and is imaged by a video camera 47 through a projection lens 46 having a predetermined magnification. Then, the video signal obtained from the video camera 47 is processed by the signal processing circuit 48 so as to comply with the magnetic recording method standardized as a still video floppy, and then input to the recording circuit 49. It The recording circuit 49 operates the magnetic head 55 based on the input video signal. Then, the magnetic head 55 magnetically records the signal-processed video signal on the magnetic sheet 58 rotated by the motor 56. When an image is reproduced from the magnetic sheet 58 thus obtained, the reproducing circuit 60 is operated and the magnetic head 61 is operated by the magnetic head 58 while rotating the magnetic sheet 58 under the same conditions as those for recording, as indicated by the broken line in the figure. An image can be observed by reading out a video signal, converting it into a television signal of, for example, an NTSC system by the signal processing circuit 62, and then inputting it to the television receiver 63. .

By the way, when the video signal is taken out from the photographic image as described above, the photographic film 4 is processed one frame at a time from the front end side thereof, and the front end portion thereof is as shown in FIG. When the strip-shaped exposure unit 50 is present, the output of the light receiver 66 that receives the light from the light projector 65 that irradiates this portion with light fluctuates. When this output fluctuation is detected, the head feed switching drive unit 70 is operated to reverse the feeding direction of the magnetic head 55 at the time of recording and feed the magnetic sheet 58 from the inside to the outside. Therefore,
In the photographic film 4 photographed by the pre-roll-up type photographic camera to which the present invention is applied, the order of recording on the magnetic sheet 58 is reversed, and the image is reproduced according to the photographing order without making any change to the reproducing device. You will be able to Alternatively, the belt exposure unit 50 may be visually detected and the head feed switching drive unit 70 may be manually switched.

As described above according to the illustrated embodiment, when the signal portion indicating that the image is photographed by the pre-roll-up type photographic camera, that is, the belt-shaped exposure portion 50 is visually detected, the belt-shaped exposure portion 50 is used. It may be recorded on the rear end side of the photographic film 4 or on the intermediate portion. Of course, instead of the strip exposure unit 50, spot exposure may be applied.

[0017]

As described above, according to the method of the present invention,
In a photo film taken with a pre-roll-up type photo camera, a signal portion indicating that the photo film is taken from the rear end side is formed, and a video signal is taken out from the photo image taken on such a photo film, and When recording the data on the magnetic sheet, the magnetic recording can be performed according to the photographing order by automatic identification or visual identification. Therefore, it is possible to observe an image with a proper time course without complicating the reproducing circuit, which is very practical.
Further, since the signal portion is formed outside the effective photographing screen,
Even if a photographic image is obtained by normal print processing without observing the image through the magnetic sheet without causing fog on the photographing screen, it is practically possible to record the signal part as it is. there is no problem.

[Brief description of drawings]

FIG. 1 is a perspective view showing the outer appearance of a photographic camera used in the present invention from the case back side.

FIG. 2 is a block diagram showing a winding control system of the photographic camera shown in FIG.

FIG. 3 is a schematic view showing a front end side of a developed photographic film when the present invention is used.

FIG. 4 is a schematic diagram of a system configuration for implementing the present invention.

[Explanation of symbols]

 3 Patrone 4 Photo film 8 Light irradiation part (for perforation counting) 9 Light irradiation part (for recording signal part) 40 Lighting control circuit 50 Strip exposure part 65 Projector 66 Light receiver 70 Head feed switching drive part

Claims (2)

[Claims] 1. Observation of a photographic image by extracting a video signal from a photographic image obtained by developing an exposed photographic film, recording the signal on a recording medium such as a magnetic sheet, and reproducing the video signal from the recording medium. In the image recording / playback method that displays images, the photo film loaded in the camera is continuously wound up in advance on the take-up spool before shooting, and then the exposed photo film is linked to the shooting operation in one frame. A display signal indicating that the photo film has been used by a pre-roll-up type photo camera for rewinding the photo film on the photo film is recorded on the photo film surface by this camera, the photo film is developed, and the photo image of the film is video-recorded. When converting to a signal and recording on a recording medium, the presence or absence of a display signal indicating the pre-winding type attached to the photographic film is determined. Separately, when a display signal is obtained, the recording order of the photographic images is reversed and recorded. 2. When a video signal is recorded on a magnetic sheet recording medium when the display signal is obtained,
2. The magnetic recording is performed from the inside to the outside of the magnetic sheet recording medium by reversing the magnetic head.
Image recording / playback method described.