JPH03256471A - Picture signal recording and reproducing system - Google Patents

Abstract

PURPOSE:To eliminate an erroneous operation by displaying in which recording mode, out of the plural kinds of mutually different recording modes, a picture signal recorded to a recording medium is recorded. CONSTITUTION:A photographed image is guided through a photographing optical systems 101 and a shutter 102 to the image pickup surface of an image pickup element 103. The signal to be outputted from the image pickup element 103 is processed by a signal processing circuit 104 and recorded to the back of a video floppy 109. In such a case, it is discriminated and displayed in which recording mode the picture signal is recorded to the recording medium to record the picture signal in the plural kinds of mutually different recording modes. Thus, the erroneous operation can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image signal recording and reproducing system that records an image signal on a recording medium and reproduces the image signal recorded on the recording medium.

[Prior Art] Conventionally, there is a still video (abbreviated as Sv) system as a device that records an image signal on a recording medium and reproduces the image signal recorded on the recording medium. This Sv system forms an image signal corresponding to a subject image using a solid-state image sensor such as a CCD or MOS type, supplies the formed image signal to a signal processing circuit, and processes the image signal in the signal processing circuit. is recorded on a magnetic disk.

FIG. 3 shows a block diagram of a signal processing circuit of an S■ system having a solid-state image sensor having, for example, R, G, and B stripe filters attached to its image sensing surface.

In FIG. 3, the R, G, and B signals output from the R, G, and H stripe filter or the solid-state image sensor 10 attached to the imaging surface are equal when a white object is imaged by the solid-state image sensor 10, respectively. After the level is adjusted in the amplifiers 201 to 203 so that the level is the same, the γ correction circuit 204 performs the well-known γ correction.

Then, the R, G, and B signals subjected to γ correction are supplied to the luminance signal forming circuit 208, and the R, G, and B signals are supplied to the luminance signal forming circuit 208.
, B signals are each sampled and held, and further switched at a predetermined timing to produce a wideband luminance signal Y.
, is formed. The wideband luminance signal Y output from the luminance signal forming circuit 20B is then passed through a low-pass filter (L
PF) 210 to limit the band and output it as a final luminance signal (Y). On the other hand, the R, G, and B signals are band-limited by low-pass filters (LPF) 205 to 207 and input to a matrix circuit 209. The matrix circuit 209 generates a narrowband luminance signal YL from the input R, G, and B signals.
Further, two types of color difference signals R-YL and B-YL are formed and output.

The luminance signal Y formed in the above manner is FM modulated, and the two types of color difference signals R-YL and B-Yt are line-sequentialized and then FM modulated, and both are frequency multiplexed and used as a video floppy signal. The video signal is recorded on a magnetic disk called a video floppy disk, and at the time of playback, it is played back from the video floppy by a playback device, and the restored image signal is displayed as an image on a TV monitor or the like.

Therefore, the image resolution by this SV system is NTS
It was compatible with current TV systems such as C system.

However, in order to improve the low image resolution of the current TV system as mentioned above, HDTV (High D
New TV systems such as efinition TV are being put into practical use. These new TV systems are about 100
It has 0 scanning lines and a corresponding horizontal signal band. Therefore, in the SV system, H
It is necessary to develop a system for recording and reproducing high-resolution still images of approximately 1000 pixels x 00 pixels (when square pixels are extracted) such as those obtained with DTV.

Therefore, CHS V (CHS V), which records and plays back high-resolution still image signals while maintaining compatibility with conventional SV systems, has been developed.
Compatible High-definition
n5tillVideo) system has been proposed by the applicant.

The above CHSV system will be briefly explained below.

FIG. 4 is a diagram showing an example of the configuration of a color filter attached to the imaging surface of an image sensor used in the CHSV system. This color filter is mounted on an image sensor having a pixel count of about 1,300 xiooo pixels.
Checkered Y signal filter and R arranged in line sequence
and a filter for the B signal. In the CHSV system, a luminance signal and a color difference line sequential signal are formed by outputting the signals accumulated in the pixels of an image sensor equipped with a color filter as shown in Fig. 4 in the following manner. There is. That is, the luminance signal for one field is 4 as A r , A 2 .
It is formed by outputting signals accumulated in pixels arranged every other line, and is
, (i is a positive integer) lines, and luminance signals for four fields, A field, B field, C field, and D field, are formed.

Also, since the color difference signals (C, 1=R-Y, CB=B-Y) must be line-sequential, if a CFI is formed using the signals accumulated in the pixels of line A1 in the figure, Due to the signal accumulated in the pixels of the B1 line, the C
B must be formed. Therefore, in the CHSV system, even lines A2n and B of each field are
The signals accumulated in the 2n+ Can and D2n (n: integer) pixels are respectively output in reverse to form a color difference line sequential signal.

The luminance signals and color difference line sequential signals formed in this way are each subjected to FM modulation, and then multiplexed for each field, and each field is distributed to four adjacent tracks on the video floppy. recorded one by one.

Figure 5(a) shows two channels, A field and B field.
This figure shows a track recording pattern when fields are simultaneously recorded, and then the head is moved by two tracks to simultaneously record C and D fields.
Figure 5(b) shows 4 channels, A field and B field.
Record the fields at the same time with a gap of one track, and
FIG. 6 is a diagram showing a track recording pattern when a C field and a D field are simultaneously recorded across the track where the field is recorded.

In addition, when recording with 2 channel heads, by playing back the B track and the D track, a still image signal for one frame based on the conventional TV format can be played back using a playback device that is compliant with the conventional SV format. In the case of recording using a 4-channel head, by reproducing tracks A and C or tracks B and D.

It is possible to reproduce still image signals for one frame according to the conventional TV system.

In addition, when reproducing a high-resolution still image signal, the image signals for four fields recorded on the A-D track are taken into memory, and the luminance signal and color difference signal are interpolated on the memory. A high resolution still image signal is output from the memory.

[Invention or Problem to be Solved] However, the user cannot display the image signal reproduced by the image signal recording and reproducing system, or the conventional method that can only be displayed on a monitor device compliant with the current TV system such as the NTSC system or the PAL system. Is the image signal reproduced by the SV system of the CH that can be displayed on both a monitor device compliant with the current TV system and a monitor device compliant with the CHSV system?
Since it was not possible to distinguish whether the image signal was reproduced by the SV system or not, the current T
There is a risk that it will be displayed only on a monitor device that complies with the V format, so when determining whether the reproduced image signal is a reproduced image signal, an image signal reproduced by the CH5V system, or an image signal reproduced by the SV system, it is necessary to comply with the CH5V format. The user had to supply a signal to the monitor device and confirm whether the display was possible or not, which required a very troublesome operation.

The present invention has been made to solve this problem, and when an image signal is recorded on a recording medium, it is possible to record an image signal recorded on a recording medium that can be recorded in a plurality of different recording modes. An object of the present invention is to provide an image signal recording and reproducing system that can determine whether the image signal is being recorded in the mode and display the image signal.

[Means for Solving the Problems] In order to achieve the above object, the image signal recording and reproducing system of the present invention is a system that records an image signal on a recording medium and reproduces the image signal recorded on the recording medium. a first recording mode in which an image signal for one screen having a first horizontal resolution is recorded on n (n is a positive integer) recording tracks on the recording medium; a second recording mode in which an image signal for one screen having a second horizontal resolution higher than the horizontal resolution is recorded on m (m is an integer larger than n) recording tracks on the recording medium; a recording means for recording an image signal on a recording medium based on a first recording mode; and an image signal reproduced from the recording medium on which the image signal was recorded by the recording means, or an image recorded in the first recording mode. and display means for displaying whether the signal is an image signal recorded in the second recording mode or not.

[Effect] The above-mentioned 4iI! According to the precept, it is possible to display in which recording mode an image signal recorded on a recording medium is recorded among different recording modes.

[Example] The present invention will be explained below using examples of the present invention.

FIG. 6 is a diagram showing an example of the configuration of a color filter attached to an image sensor used in an image signal recording and reproducing system as an embodiment of the present invention.

In FIG. 6, the size of one pixel is dxd. The image sensor used in this embodiment has a total number of pixels of about 1300 pixels x 00 pixels, and the odd lines are R-B-G color filters. The G-R-B color filters are repeatedly arranged, and the even-numbered lines have a configuration in which G-R-B color filters are repeatedly arranged from positions shifted by half a pixel with respect to the odd-numbered lines.

FIG. 7 shows the output from an image sensor 701 having a color filter attached to its imaging surface as shown in FIG. 6 as a Y signal according to the Sv format and a color difference signal CR (RYL).
, CB(B Yt, ). FIG. In the configuration shown in FIG. 7, the same components as those shown in FIG. 3 are given the same reference numerals, and detailed explanations will be omitted.

In the configuration shown in FIG. 7, first, the image sensor 701 outputs the A and B line signals of the image sensor 701, and the A and line outputs are sent to the signal processing circuit 702, and the B line signals are output from the image sensor 701.
, line signals are supplied to a signal processing circuit 703, and in each signal processing circuit, the Y signal is input in the same manner as the configuration shown in FIG.

CR and Ca signals are formed. After the processing of lines A and B is completed, the signals of C1 and A are output, the output of line C is supplied to the signal processing circuit 702, and the signal of line is supplied to the signal processing circuit 703. and in the same manner as the configuration shown in FIG. 3 in each processing circuit,
Y, CIl, CB multiplied signals are formed.

In this way, in this embodiment, the image sensor 701 has A, B, .
The C□, D, and line signals are processed and converted to SV.
Image signals for four fields are formed according to the format. FIG. 1 is a block diagram of a recording section that records an image signal corresponding to a subject in an image signal recording and reproducing system as an embodiment of the present invention.

In FIG. 1, a photographic subject image is guided to an imaging surface of an image sensor 103 via a photographic optical system 101 and a shutter 102. As described above, the signals output from the image sensor 103 are separately supplied to the signal processing circuit 104 for the A, line and the B, line, or the C, line and the D1 line. Y as shown.

After being converted into CR and Ca signals, the Y signal is also FM modulated in the recording process circuit 105, and
After Cn and Co are line sequentialized, they are FM modulated and further mixed. At that time, pilot signal generation circuit 1
A pilot signal for time base fluctuation correction generated by 06 is also superimposed.

This pilot signal is a sine wave signal having a frequency of, for example, 2.5 MHz on the frequency allocation shown in FIG. The signals corresponding to lines A and C are recorded by the magnetic head 107 on the front side of the video floppy 109 which is being rotated by the motor 110.
Signals corresponding to B, and lines are sent to the magnetic head 108.
is recorded on the back side of the video floppy 109.

FIG. 9 is a diagram showing signal recording positions on a video floppy. FIG. 9(a) shows the recording pattern on the front side of a video floppy. The track marked A in the figure records a signal corresponding to line A, and the track marked C in the figure records a signal corresponding to line A. 9(b) shows the recording pattern on the back side of the video floppy, and the track indicated by B in the figure records the signal corresponding to line B. A signal corresponding to the line is recorded in the track indicated by D in the figure. The distance from the center of rotation 90 of the video floppy is the same for the A and B) racks, and the same for the C9D track. The recording order is such that tracks A and B are recorded simultaneously, and then tracks C and D are recorded simultaneously.

FIG. 2 is a block diagram showing a schematic configuration of a reproducing device in an image signal recording and reproducing system as an embodiment of the present invention. In FIG. 2 as well, a signal reproduced by a magnetic head 302 from the front side of a video floppy 301 that is being rotated by a motor 300 passes through a preamplifier 303 and a reproduction process circuit 304 and a band pass filter (hereinafter abbreviated as BPF). The reproduction process circuit 304 separates the FM modulated luminance signal and the FM modulated color difference line sequential signal from the signal reproduced by the magnetic head 302, and performs FM demodulation, de-emphasis, etc. on the FM modulated luminance signal. After performing processing such as FM demodulation and de-emphasis on the FM modulated color difference line sequential signal,
By performing the synchronization process, a reproduced Y signal, a reproduced CII signal, and a reproduced CB multiplied signal are formed.The formed reproduced Y signal is passed through the LPF 305, and the reproduced Ca signal and the reproduced Cwa signal are respectively passed through the LPF 306. By passing the signal through the LPF 307, unnecessary frequency component signals are removed and output. On the other hand, the signal output from the preamplifier 303 is also supplied to the BPF 30B, and the BPF 308 is
．． A signal with a frequency component of 5 MHz is passed through the detection circuit 3.
09 and the PLL circuit 312. The signal detected by the detection circuit 309 is supplied to a comparator 310, and the comparator 310 detects whether the level of the signal output from the detection circuit 309 has reached a predetermined level. The presence or absence of a pilot signal in the signal reproduced from M301 is determined, and the result is displayed on display M311.

FIG. 11 is a perspective view of an image signal recording and reproducing apparatus which is an embodiment of the present invention. This image signal recording and reproducing device! 1llO
1 is provided with an HD mode display 1102 that displays CH8vH8 top and an N mode display 1103 that displays field or frame playback mode, and the comparator 310 detects the presence of a pilot signal. Sometimes the HD display 1102 lights up, and when it is detected that there is no pilot signal, the N indicator 1103 lights up. Further, a changeover switch 1104 is set to an automatic display mode in which a reproduced still image signal is automatically output to a high-definition monitor or a standard monitor connected to the image signal recording and reproducing device 1101 according to the determination result of CHSV reproduction mode and field or frame reproduction mode. and a forced display mode in which a reproduced still image signal is forcibly output to a standard monitor regardless of the determination result of the reproduction mode. This changeover switch 1104 can be operated arbitrarily by the operator, and the automatic display mode or forced display mode can be arbitrarily set according to the operator's intention.

Hereinafter, the above-mentioned display mode will be explained using FIG. 2. The changeover switch 1104 in FIG. 11 corresponds to the switch 317 in FIG. 2, and by setting the changeover switch 1104 shown in FIG. 11 to the A side in the figure, the switch 317 in FIG. 2 is turned on. Automatic display mode is activated. Then, the connection state of the switch 313 is controlled according to the comparison result of the comparator 310.

That is, when the comparator 210 detects the presence of a pilot signal, the switch 313 switches the A/D converter 31
Connected to the 4 side, Y,,CR.

The CB double signal is input to the A/D converter 314, and the comparator 31
When it is detected that there is no pilot signal at 0, the switch 313 is connected to the encoder 316 side, and the Y
The H, CR, and Ca signals are input to an encoder 316.

In addition, the changeover switch 1104 shown in FIG.
By setting the switch 317 in FIG.
It becomes FF state and becomes forced display mode. When the signal from the comparator 310 is not supplied to the switch 313, the switch 313 is connected to the encoder 316 side,
The above-mentioned signals Y)l, CR, and CB are input to an encoder 316.

The encoder 316 is supplied with Y,,C,.

A video signal conforming to, for example, an NTSC television signal is formed from the C6 signal, and a standard still image is displayed on a standard monitor (not shown). In addition, if the presence of a pilot signal is detected in the comparator 310 in the automatic display mode, Yo, CR, CB double signal A/D
It is converted into a digital signal by converter 314 and stored in image memory 315.

On the other hand, from the signal reproduced by the magnetic head 320 from the back side of the video floppy 301,
Similarly to the signal reproduced by the magnetic head 302 from the front side of 01, the preamplifier 321 and the reproduction process circuit 322
, Y by LPF323, LPF324, 325,
CR and Ca signals are formed and supplied to the A/D converter 328.

Further, a clock signal generated by the PLL circuit 327 based on the pilot signal separated from the reproduced signal by the BPF 326 is input to the A/D converter 328, and is supplied to the Y as described above.

The Cm and C8 signals are digitized by A/D converter 328 and stored in image memory 315.

The reproduced image data inputted from the A/D converters 314 and 328 from the A and C tracks and the B and Ill racks and digitized is placed at the pixel position on the image sensor 103 of the recording device shown in FIG. They are stored in the addresses set in the corresponding order.

Subsequently, the image processing circuit 329 performs interpolation processing.

Below, an example of the interpolation process by the image processing circuit 329 will be described in the first example.
This will be explained using Figure 0.

FIG. 10 is a diagram showing storage address positions of reproduced image data corresponding to the Y signal in memory space A of the image memory 315. ○ indicates A and C of video floppy 301
Playback image data played from the track, △ is video
This is reproduced image data reproduced from the B and Dl racks of the floppy 301. ◯ and △ are indicated in the horizontal direction according to the pixel position on the image sensor 103 of the recording device shown in FIG.
For example, at the intermediate position between ○ and ○ indicated by ■ in the figure, the image processing circuit 329 converts the left and right image data a I p a 2 and the upper and lower image data b+ and b2 into images. Read from memory 315, 4
Calculate the average value of the two image data, and use the average value data as
Interpolate as position data. By performing the interpolation process as described above, the number of image data in the horizontal direction can be doubled.

In addition, for Y@7, the image processing circuit 329 uses a two-dimensional digital filter to extract the low frequency component of the Y signal.
By performing PF processing, a YL signal (y,, is a low frequency component of the Y signal) is formed, and by further calculating (yyt,), a Y8 signal (Y, 4 is a high frequency component of the Y signal) is generated. , and the formed YL, Y)I data is stored in the image memory 31.
5 and the data of y, yL, c, , cB are stored in the image memory 315. After that, the image memory 31
Each data stored in 5 is read out at a predetermined clock rate.

Among these, YL, CR, Ca data are matrix circuit 3
30, RL, Gt, , Bt are converted into data, and further, in an adder 331, Y and data read from the image memory 315 are added,
Each of the signals is converted into an analog signal by a D/A converter 332, and output as R, G, and B signals.

Further, in the apparatus shown in FIG. 2, the image memory 315
Data for approximately 500 pixels in the vertical direction and approximately 650 pixels in the horizontal direction as shown by B in the figure is read out from any location in the memory space A by a readout control circuit (not shown).

That is, Y stored in memory space B of the image memory 315.

CR, Ca data are y x , Cl1t, respectively
C811, these y', c, ca'' data are read out by a readout control circuit (not shown) corresponding to one horizontal line at a rate of IH (approximately 63g5), and then converted into an analog signal by a D/A converter 333. The converted analog signal is input to the encoder 4334.The encoder 334 then inputs the converted analog signal to the D/A converter 33.
Y II, CRII, CBI supplied from 3
+II, for example, a video signal compliant with the NTSC system (*
) and output, a frame reproduced image signal is formed. Also, as described above, the image memory 315
A field reproduction image signal is formed by reading out data for about 250 pixels every other horizontal line in the vertical direction from the memory space B by a readout control circuit (not shown).

As explained above, in this embodiment, depending on the presence or absence of the pilot signal in the signal reproduced from the video floppy, whether the image signal reproduced from the video floppy is
By determining whether the image signal is recorded in SV recording mode or in field or frame recording mode and displaying the result
The user can arbitrarily select the monitor device for displaying the image signal reproduced by the 3V system, whether it is a monitor device compliant with the CH5V system or a monitor device compliant with the current TV system, and Therefore, it is possible to avoid an erroneous operation in which an image signal reproduced by a conventional Sv system is supplied to a monitor device compliant with the CHSV system.

[Effects of the Invention] As explained above, according to the present invention, when an image signal is recorded on a recording medium, the image signal recorded on the recording medium that can be recorded in a plurality of different recording modes C. is recorded in which recording mode,
It becomes possible to provide an image signal recording and reproducing system that can display images.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a recording unit that records an image signal corresponding to a subject in an image signal recording and reproducing system as an embodiment of the present invention, and FIG. 2 is a block diagram of a recording unit in an image signal recording and reproducing system as an embodiment of the present invention. A block diagram showing a schematic configuration of a playback device, FIG. 3 is a block diagram of a signal processing circuit of a conventional SV system, and FIG. 4 shows a color filter attached to the imaging surface of an image sensor used in a CH5V system. Figure 5(a) is a diagram showing a track recording pattern formed on a video floppy by two channel heads in a conventional CHSV system, and Figure 5(b) is a diagram showing an example of the configuration of a conventional CHSV system. A diagram showing the track recording pattern formed on a video floppy by a four-channel head in the system;
FIG. 6 is a diagram showing an example of the configuration of a color filter attached to an image sensor used in an image signal recording and reproducing system as an embodiment of the present invention, and FIG. 7 is a diagram showing a color filter as shown in FIG. FIG. 8 is a block diagram of a signal processing circuit that converts the output from the image sensor attached to the image plane into a Y signal conforming to the Sv format and color difference signals R-Y, B-Y. Figure 9 shows the frequency allocation of signals recorded in
The figure shows the recording position of the signal recorded on the video floppy in this embodiment, FIG. 1 is a perspective view of an image signal recording and reproducing apparatus that is an embodiment of the invention. In the figure. 107.108, 302, 320: 2-channel magnetic head 30B: B P F Co 10: Comparator 31
1: Display device 3I3: Switch 315: Image memory 316.334: Encoder 317: Changeover switch 1102: HD momo display 1103: N mode display

Claims (1)

[Claims] A system that records an image signal on a recording medium and reproduces the image signal recorded on the recording medium, the system includes:
A first recording mode in which an image signal for one screen having a first horizontal resolution is recorded on n (n is a positive integer) recording tracks on a recording medium, and a second recording mode having a higher horizontal resolution than the first horizontal resolution.
a second recording mode in which an image signal for one screen having a horizontal resolution of recording means for recording an image signal on a recording medium based on the recording means; and a recording means for recording an image signal on a recording medium on which the image signal is recorded by the recording means, and whether the image signal reproduced from the recording medium on which the image signal is recorded by the recording means is an image signal recorded in the first recording mode or the second recording mode. 1. An image signal recording and reproducing system comprising: display means for displaying an image signal recorded in a mode.