JPH0622338A - Still picture magnetic recording and reproducing device - Google Patents

Abstract

(57) [Abstract] [Purpose] The interpolation unit can be connected to the camera body as an external device without increasing the device scale.
To be able to perform interpolation processing. [Structure] Image signal output from the imaging unit 1 or A /
The data read from the image memory 5 is stored in the image memory 5 via the D converter 4 and converted into analog data by the D / A converter 8 at the time of recording, and then written by the magnetic head 11 via the switch 10 by the SV recording process unit 9. To do. During reproduction, the interpolation circuit 18 is connected to the interpolation circuit connection terminal 17 connected to the image memory 5 via the cable 19.
Is connected, the reproduction signal from the head 11 is processed by the SV reproduction process unit 13, the analog signal is converted by the A / D converter 4 via the switch 3, and the analog signal is stored in the image memory 5 and stored in the image memory 5. Interpolation processing is performed on the obtained data by the interpolation unit 18, and the processed data is output to an external monitor via the switch 7, the output signal processing unit 14, the D / A converter 15 and the video output terminal 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still image magnetic recording / reproducing apparatus for recording a still image on a floppy disk by a sample value analog transmission system.

[0002]

2. Description of the Related Art Still video (Still Video: hereinafter referred to as SV) is one of means for recording an image, in which an image is electrically recorded on a recording medium such as a magnetic floppy disk.
There is a system. This is the current TV system (NT
SC / PAL) images are recorded / reproduced in 50 fields. This type of device can instantly reproduce an image on a television screen simply by connecting a television monitor, without the need for chemical treatment such as development and printing, which is required for silver halide photography.

A CH that is compatible with the current format while improving the resolution of this SV system.
The SV method (Format Compatible High Definition SV) has already been proposed by the applicant.

Here, the outline of the CHSV system will be described. The CHSV system uses a technique called sampled value analog transmission. This is a technique also used in the MUSE (Multiple Sub Nyquist Sampling Encoding) system proposed by the Japan Broadcasting Corporation (NHK) as a transmission system of HDTV (High Definition Television), and it is a predetermined technique. It is intended to correctly transmit a sample value sequence (with a time interval of T) using an analog transmission line with band limitation.

First, the recording method will be described with respect to the luminance signal (Y signal). FIG. 2 shows sample points of the Y signal recorded by the CHSV method. The sampling points of the Y signal are offset as shown in FIG. 2, and subsampling transmission is performed. There are 650 (1300/2) sample points in one row and 500 (1000/2) sample points in one column. Then, the sample values included in the lines A ₁ , A ₂ ... In one track, the sample values included in the lines B ₁ , B ₂ ... In another track, and so on. Recording according to the current SV format is performed using a total of 4 tracks. In addition, a HIT pulse for matching the sample phase at the time of reproduction is added during this recording.

Next, the reproducing method will be described.

The signal reproduced from the magnetic medium by the magnetic head is input to the SV reproducing process circuit. Here, Y / C separation, FM demodulation, de-emphasis, etc. are performed, and a reproduced Y signal and a reproduced C signal are output. And
These two signals are γ-inverted and further band-limited to A /
It is input to the image memory through the D (analog / digital) converter. The sampling clock used in this A / D converter extracts a pilot signal frequency-multiplexed at the time of recording from an FM signal reproduced from a magnetic recording medium, and time-axis correction is performed by using a synchronization signal separated in synchronization with the pilot signal. It is a clock.

This process is performed for four tracks, and the sample value is input to the image memory. Then, interpolation processing or the like is performed in the image memory, the high frequency component of the Y signal is added through the Y ₁ color difference → matrix circuit, and converted into an analog signal by a D / A (digital / analog) converter.
It is output as a signal.

As described above, in the CHSV system, signals are distributed and recorded on four tracks. As one method, two-channel simultaneous recording is performed twice using a two-channel frame head. At this time, it is necessary to move the head when performing the second recording (third and fourth tracks) after the first recording (first and second tracks). At this time, there is a method of storing the signal in the image sensor itself and mounting an image memory, and retaining the data in the memory. To avoid it, it is necessary to move the head at high speed.

Further, when the image memory is mounted, since a memory for one frame is required, there is a problem that the scale including the A / D and D / A converters becomes large. However, in this case, the load on the mechanical part of the camera is reduced due to the time margin. In addition, it is possible to apply cyclic noise reduction on the memory and easily correct the Y-C time difference due to the filter. This memory can also be used during playback, and CHSV playback is possible on the camera.

[0011]

However, in order to perform CHSV reproduction by the above-mentioned CHSV camera mounted in the image memory, an interpolating circuit is inevitably necessary, which is large in circuit scale, and this must be incorporated in the camera. If incorporated, there is a problem that it becomes a fairly large-scaled camera.

The object of the present invention was made in view of the above-mentioned circumstances of the prior art, and provides a still image magnetic recording / reproducing apparatus capable of performing an interpolation process without increasing the size of the apparatus. Especially.

[0013]

In order to achieve the above object, the present invention provides a CHSV still image on a magnetic recording medium.
In a still image magnetic recording / reproducing apparatus that performs recording / reproduction according to a method, an image memory provided on the camera body side for storing image signals, and connected to the image memory and provided on the camera body, and connected at least at the time of CHSV reconstruction And an interpolation circuit connection terminal to which an interpolation unit for performing interpolation processing can be connected.

[0014]

According to the above means, an interpolation unit configured as an external device is connected at the time of reproduction to exchange data with the image memory. Therefore, it is not necessary to incorporate an unnecessary interpolation unit in the camera body during recording,
It is possible to reduce the scale of the camera alone at the time of recording.

[0015]

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

FIG. 1 is a block diagram showing a still image magnetic recording / reproducing apparatus according to the present invention.

First, the structure on the recording side will be described. The image pickup unit 1 includes an optical lens, a shutter, an image pickup element, and the like, and converts an optical image of a subject into an electric signal. The imaging unit 1 is
The video signal processing unit 2 is connected, one of the contacts of the switch 3 is connected to the imaging / video signal processing unit 2, and the common contact is sequentially connected to the A / D converter 4 and the image memory 5. An address generation circuit 6 is connected to the image memory 5. A switch 7 is connected to the image memory 5, and a D / A converter 8 and
The SV recording process unit 9 is connected, and the recording side contact of the switch 10 is connected to the output of the SV recording process unit 9. The magnetic head 11 is provided at the common contact of the switch 10.
, And a magnetic recording medium (SV floppy disk) 12 is arranged facing the magnetic head 11. The magnetic recording medium 12 rotates at a constant speed using a motor (not shown) as a drive source.

Next, the structure on the reproducing side will be described. The contact on the reproduction side of the switch 10 has an SV reproduction process unit 1
3 is connected, and its output is connected to the reproducing side contact of the switch 3. The output signal processing unit 14 is connected to the reproduction side contact of the switch 7, and the output signal processing unit 14
A D / A converter 15 is connected to. further,
A video output terminal 16 for connecting to an external monitor or the like is connected to the output signal processing unit 14. Further, an interpolation circuit connection terminal 17 is connected to the image memory 5 so that an interpolation unit 18 can be connected when reproducing.

With the above construction, at the time of recording,
The photoelectrically converted signal from the image pickup unit 1 is converted into a video signal by the image pickup / video signal processing unit 2, and a white balance circuit,
The data is converted into digital data by the A / D converter 4 through a γ conversion circuit, a Y color difference matrix, etc., and is written in the image memory 5. The image memory 5 is 1300 × 1000 × 3 × 8
Bit size is used. Half the data of this memory, that is, the data of one field of the A _n line and the two fields of one field of the B _n line in FIG. 2 is read from the memory and converted into an analog signal by the D / A converter 8. . Further, after the SV recording process unit 9 performs FM modulation and frequency multiplexing processing, the magnetic head 1
Recording is performed on the magnetic recording medium 12 from 1. Then, after that, the magnetic head 11 is moved, the same processing is performed on the data of the remaining two fields of the image memory 5, and recording is performed on four tracks in total.

On the other hand, at the time of reproduction, the switch 3, the switch 7 and the switch 10 are interlocked to be switched to the reproduction side, and the signal from the magnetic head 11 is subjected to YC separation and FM demodulation by the SV reproduction process unit 13. It is turned into a video signal. This video signal is sent to A / D via switch 3.
It is applied to the converter 4, converted into a digital signal by the A / D converter 4, and written in the image memory 5. This operation is performed for four tracks. Since the data in the image memory 5 is a sample value, the interpolation unit 18 connected to the interpolation circuit connection terminal 17 is used to interpolate other pixels. At this time, the data in the image memory 5 is
Cable 1 from the interpolation circuit connection terminal 17 provided on the camera side
9 to the interpolation unit 18 and the interpolation unit 1
In 8, all pixels are filled with data, and the data is sent to the output signal processing unit 14. Here, the Y color difference is converted to an RGB signal through the RGB matrix, the high frequency components of Y are added, and this is converted into an analog signal by the D / A converter 15, and then the signal is sent to an output device such as a monitor. It

When it is desired to confirm the image captured from the image pickup section 1 by the so-called EE system without passing through the electromagnetic conversion system, each switch is set to the EE side to write data in the image memory and output signal processing. Section 14, D / A converter 15
Through the output device.

As described above, the interpolating circuit connection terminal 17 is provided on the camera side, and the interpolating unit 18 is connected to this terminal at the time of reproduction, so that it is not necessary to make connection at the time of recording, so that the size of the camera alone at the time of recording can be reduced. be able to.

[0023]

As described above, according to the present invention, in a still image magnetic recording / reproducing apparatus for recording / reproducing a still image on a magnetic recording medium by the CHSV system, an image provided on the camera body side and storing an image signal. Not necessary at the time of recording, since a memory and an interpolating circuit connecting terminal which is connected to the image memory and provided in the camera body and which can be connected to at least an interpolating unit for interpolating processing when connected to the CHSV reproduction are provided. Since it is not necessary to incorporate a special interpolation unit in the camera body, the scale of the camera itself at the time of recording can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a still image recording apparatus according to the present invention.

FIG. 2 is an explanatory diagram illustrating an array of recording pixels according to the present invention.

[Explanation of symbols]

 1 Imaging Unit 2 Imaging / Video Signal Processing Unit 3, 7, 10 Switch 4 A / D Converter 5 Image Memory 6 Address Generation Circuit 8 D / A Converter 9 SV Recording Process Unit 11 Magnetic Head 12 Magnetic Recording Medium 13 SV Reproduction Process Unit 14 Output signal processing unit 15 D / A converter 16 Video output terminal 17 Interpolation circuit connection terminal 18 Interpolation unit 19 Cable

Claims (1)

[Claims] 1. A still image magnetic recording / reproducing apparatus for recording / reproducing a still image on / from a magnetic recording medium by the CHSV system, an image memory provided on the camera body side for storing an image signal, and connected to the image memory. A still image magnetic recording / reproducing apparatus, comprising: an interpolation circuit connection terminal which is provided in the camera body and which is connected at least during CHSV reproduction and to which an interpolation unit for performing interpolation processing can be connected.