JPH02199977A - Still picture recording and reproducing system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a still image recording and reproducing method.

[Conventional technology]

In recent years, with the development of television cameras and magnetic recording devices, electronic still image recording and reproducing devices have become commercially available in place of conventional film cameras. As a representative example of this, there is known an apparatus as shown in FIG. 2, which records still images on a micromagnetic disk and reproduces the recorded still images.

As is well known in this technical field, one screen of a video signal captured by a video camera is usually composed of (1/30) seconds. When recording a video signal, the switch circuit 3 is moved to the recording amplifier 1 side, and the video signal for half the time of one screen (1/60) seconds, that is, for one field, is recorded.
1 on the magnetic disk 5 being rotated by the motor 6 by the magnetic head 4 via the recording amplifier 1 and the switch circuit 3.
Record on track. That is, the video signal for one field is recorded on the magnetic disk 5 as a thinned-out video signal. When reproducing the video signal recorded on the magnetic disk 5, the switch circuit 3 is moved to the reproduction amplifier 2 side.
The recorded video signal for one field is transferred to the magnetic disk 5.
The picked up signal is picked up by the magnetic head 4 from above, and the picked up signal is reproduced by the switch circuit 3 and the reproduction amplifier 2, and this reproduced video signal and this are transferred to the delay element 1.
The switching circuit 11 alternately outputs the video signal delayed by 0.5H (H is one horizontal scanning time) by 0 for each rotation of the magnetic disk 5, thereby reproducing one screen of still images.

With this configuration, one screen of video is recorded on one track on the magnetic disk, so for example, if there are 25 tracks, it is possible to record video signals for 50 screens on one magnetic disk. can.

[Problem to be solved by the invention]

However, in the conventional still image recording and reproducing method, since the video signal for one field is recorded and reproduced as one screen, there is a drawback that the resolution in the vertical direction is halved.

Therefore, an object of the present invention is to provide a still image recording and reproducing method that can obtain reproduced still images without degrading the resolution in the vertical direction.

[Means to solve the problem]

The still image recording and reproducing method according to the present invention records an input video signal including a vertical synchronizing signal and having one screen consisting of an odd field and an even field on a magnetic disk having a plurality of tracks and rotating in synchronization with the vertical synchronizing signal. , recording as a recorded video signal by a magnetic head, and reproducing one screen of the recorded video signal from the magnetic disk as a reproduced video signal by the magnetic head;
In a still image recording and reproducing method for obtaining still images, dividing the plurality of tracks into odd numbered tracks and even numbered tracks,
When recording the input video signal, one of the odd field and the even field is recorded on the odd track, the other of the odd field and the even field is recorded on the even track, and the recording When reproducing the video signal, the odd and even fields of the same screen recorded in two adjacent tracks are temporarily stored in a memory as a video signal, and the stored video signal is used as the still image. The feature is that it outputs.

[For production]

In the present invention, when recording an input video signal, one of the odd and even fields of the input video signal is recorded on the odd track on the magnetic disk, and the other of the odd and even fields is recorded on the even track. Record. Then, when playing back the recorded video signal,
Odd-numbered fields and even-numbered fields of the same screen recorded on two adjacent tracks are temporarily stored as video signals in a memory, and the stored video signals are output as still images. In this way, by combining the odd and even fields of the same screen, which are video signals recorded on two tracks, in the memory, it is possible to obtain a reproduced still screen with high resolution in the vertical direction as well.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Referring to FIG. 1, a still image recording and reproducing apparatus to which a still image recording and reproducing method according to an embodiment of the present invention is applied includes a recording amplifier 1 to which an input video signal V from a video camera or the like is supplied. As is well known, the input video signal VT includes a vertical synchronization signal, and one screen consists of an odd field and an even field. The output of the recording amplifier 1 is supplied to a switch circuit 3. The switch circuit 3 is the recording amplifier 1
This is for switching between the reproducing amplifier 2 and the reproducing amplifier 2. When recording the input video signal VI, the switch circuit 3 is turned to the recording amplifier 1 side, and when reproducing the recorded video signal VR, which will be described later,
The switch circuit 3 is moved to the reproduction amplifier 2 side. motor 6
rotates in synchronization with the vertical synchronization signal of the input video signal vI, causing the magnetic disk 5 to rotate. As is well known, the magnetic disk 5 has a plurality of concentric tracks. In the present invention, a plurality of tracks are divided into odd-numbered tracks and even-numbered tracks, as will be described later.

When recording the input video signal V, the input video signal v1 is transmitted by the magnetic head 4 via the recording amplifier 1 and the switch circuit 3 during the first (first) revolution of the magnetic disk 5.
It is recorded as a video signal VR recorded on odd-numbered tracks on the magnetic disk 5.

The video signal V9 recorded at this time is only an odd field of two field video signals obtained by thinning out one screen by half. After moving the magnetic head 5 one track in the radial direction, during the next (second) rotation,
The even field video signals, which are the remaining field video signals on the same screen, are sent to the magnetic disk 5 by the magnetic head 4.
It is recorded as a video signal vR recorded on an even numbered track adjacent to the odd numbered track above.

When reproducing the recorded video signal VR, the video signal recorded on odd-numbered tracks on the magnetic disk 5 rotated by the motor 6 is read by the magnetic head 5. This read video signal is reproduced by a reproduction amplifier 2. The reproduced odd field video signal is digitized by an analog/digital (A/D) converter 7 and then stored in an odd field section in an integrated circuit (IC) memory 8. Next, the magnetic head 5 reads the video signal recorded on the even-numbered track adjacent to the odd-numbered track in which the even-field video signal of the same screen is recorded, and is reproduced by the reproduction amplifier 2. The reproduced even field video signal is digitized by the A/D converter 7 and then stored in the even field portion of the IC memory 8.

As a result, the IC memory 8 has video signals of odd fields and even fields. The IC memory 8 alternately converts these signals into digital/
Since the reproduced video signal Vo is output via the analog (D/A) converter 9, still images with no degradation in vertical resolution are continuously reproduced. During this time, the rotation of the magnetic disk 5 is stopped.

In this embodiment, since the reproduced video signal is first digitized and stored in the IC memory 8, image processing such as enlarging a part of one screen or reducing the entire one screen is performed by software. Various applications can be made, such as making it possible.

In the above embodiment, the odd-numbered track is recorded with the video signal of the odd-numbered field, and the even-numbered track is recorded with the video signal of the even-numbered field. It is also possible to record video signals of odd fields.

〔Effect of the invention〕

As described above, according to the present invention, when recording an input video signal, odd fields (even fields) are recorded on odd tracks, even fields (odd fields) are recorded on even tracks, and the recorded video When reproducing a signal, the odd and even fields of the same screen recorded in two adjacent tracks are partially stored in the memory as a video signal, and this stored video signal is output as a still image. This has the effect that still images can be continuously reproduced without deterioration in vertical resolution.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a still image recording and reproducing apparatus to which a still image recording and reproducing method according to an embodiment of the present invention is applied, and FIG. 2 is a still image recording device to which a conventional still image recording and reproducing method is applied. FIG. 2 is a block diagram showing the configuration of a playback device. DESCRIPTION OF SYMBOLS 1... Recording amplifier, 2... Playback amplifier, 3... Switch circuit, 4... Magnetic head, 5... Magnetic disk, 6... Motor, 7... A/D converter , 8... ■ C memory, 9... D/A converter. Figure 2

Claims (1)

[Claims] 1. An input video signal including a vertical synchronization signal and one screen consisting of an odd field and an even field is transferred onto a magnetic disk having a plurality of tracks and rotating in synchronization with the vertical synchronization signal. A still image in which a still image is obtained by recording as a recorded video signal by a head, and reproducing one screen of the recorded video signal from the magnetic disk as a reproduced video signal by the magnetic head. In the recording/reproducing method, the plurality of tracks are divided into odd-numbered tracks and even-numbered tracks, and when recording the input video signal, one of the odd-numbered field and the even-numbered field is recorded on the odd-numbered track, and the The other field of the odd field and the even field is recorded in the even track, and when the recorded video signal is reproduced, the odd field and the even field of the same screen recorded in two adjacent tracks are once recorded. A still image recording and reproducing method characterized in that the video signal is stored in a memory as a video signal, and the stored video signal is output as the still image.