JPH0530461A - Still video device - Google Patents

Abstract

PURPOSE:To obtain a picture of high quality without changing the band of a picture signal recorded on a recording medium by providing a picture signal storage means and a picture signal recording means. CONSTITUTION:The picture signal storage means which divides the picture signal corresponding to one picture into plural parts and stores them in memories 26 to 28 and the picture signal recording means which expands time bases of a part or all of plural picture signals to record them on one or plural tracks of a recording medium D are provided. In this case, information required for the processing of division and time base expansion is stored in the part where an ID code is recorded of the recording medium D. Thus, the picture of high quality is obtained without changing the band of the picture signal recorded on the recording medium like a magnetic disk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still video device for recording an image signal on a recording medium such as a magnetic disk.

[0002]

2. Description of the Related Art A conventional still video device is configured to FM-modulate an input image signal and record the image signal.
The band of the signal recorded on the track of the magnetic disk is fixed. The width of this band is limited due to the structure of the disk device, and cannot be increased without limit.

[0003]

Therefore, in the conventional still video device, even if a high-quality or wide-band image signal is input to the still video device, the resolution of the image is limited, and this image is particularly printed. There is a problem that the image quality is significantly deteriorated when it is turned off. It is an object of the present invention to provide a still video device capable of obtaining a high quality image without changing the band of an image signal recorded on a recording medium such as a magnetic disk.

[0004]

A still video apparatus according to the present invention includes an image signal storage means for dividing an image signal corresponding to one screen into a plurality of pieces and storing them in a memory, and a part of the plurality of image signals. Alternatively, an image signal recording means for expanding all the image signals on the time axis to record them on one or a plurality of tracks of the recording medium is provided.

[0005]

The present invention will be described below with reference to illustrated embodiments. FIG. 1 is a block diagram of a recording system of a still video device to which an embodiment of the present invention is applied.

The system control circuit 10 is a microcomputer and controls the entire still video apparatus. The disk device has a magnetic head 11 and a spindle motor 12 for rotationally driving the magnetic disk D. The magnetic head 11 is tracking-controlled by the system control circuit 10 and is displaced along the radial direction of the magnetic disk D. The spindle motor 12 is drive-controlled by the system control circuit 10 and rotates the magnetic disk D at a rotation speed of 3600 rpm, for example. While the magnetic disk D is rotating, the magnetic head 1
1 is located on a predetermined track of the magnetic disk D, and an image signal and an ID code are recorded on this track. The recording amplifier 13 is controlled by the system control circuit 10 and outputs an image signal and the like to the magnetic head 11. In addition,
The magnetic disk D has 52 tracks, and signals such as image signals are recorded on 50 tracks counting from the outermost track to the inner track.

An operating unit 14 connected to the system control circuit 10 is provided for operating the present still video device. The ID code relating to the image recorded on the magnetic disk D, that is, the data such as the recording mode, the photographing date, and the screen division method described later is also input through the operation unit 14.

A high-quality image signal obtained by a still video camera (not shown) or an external input terminal (not shown) is sent to an image signal processing circuit (not shown) by the image signal processing circuit (not shown).
It is divided into one color difference signal (RY, BY) and a luminance signal (Y + S) including a horizontal synchronizing signal and input to the still video device. In the figure, the symbol (H) attached to the luminance signal and the color difference signal means high image quality. The horizontal synchronizing signal S included in the luminance signal (Y + S) is separated from the luminance signal (Y + S) by the synchronizing signal separation circuit 21,
It is sent to the memory control circuit 22 and the system control circuit 10. Memory control circuit 22
On the basis of the horizontal synchronizing signal S, AD converters 23, 2
4, 25, Y memory 26, RY memory 27 and B-
The Y memory 28 is controlled. In addition, the memory control circuit 22 uses the DA converters 31, 32, 33 and the Y memory 2 based on a sync signal from a sync signal generation circuit 34 described later.
6, controlling the RY memory 27 and the BY memory 28.

Luminance signal (Y + S) including horizontal synchronization signal
Is AD-converted by the AD converter 23, and the luminance signal Y recorded between the two horizontal synchronizing signals is stored in the Y memory 26 under the control of the memory control circuit 22.
Similarly, the color difference signal (RY) is AD-converted by the AD converter 24 and stored in the RY memory 27. The color difference signal (BY) is AD converted by the AD converter 25 and stored in the BY memory 28.

Y memory 26, RY memory 27 and B
-Y luminance signal Y and color difference signal (R
-Y, BY) are DA-converted by DA converters 31, 32, and 33, respectively, based on the synchronization signal (reference clock signal) output from the synchronization signal generation circuit 34.
At this time, the reference clock signal is the memory 26, 27, 28.
It has, for example, half the frequency of the reference clock signal used to record the image signal. Therefore, the image signal is read out from each of the memories 26, 27 and 28 at a relatively slow speed, and the time axis is expanded thereby. Now, the DA converted luminance signal Y is Y
It is input to the recording processing circuit 35 and subjected to processing such as FM modulation. Two DA-converted color difference signals (RY, B-
Similarly, Y) is also input to the C recording processing circuit 36 and subjected to processing such as FM modulation.

The ID code input via the operation unit 14 and the system control circuit 10 is subjected to processing such as DPSK modulation in the ID recording processing circuit 37.

The DPSK-modulated ID code, the FM-modulated luminance signal, and the color-difference signal are superimposed by the adder 38, amplified by the recording amplifier 13, and sent to the magnetic head 11. Then, the ID code, the luminance signal and the color difference signal are recorded on a predetermined track of the magnetic disk D by the magnetic head 11. As described above, the signal recorded on the magnetic disk D is expanded in the time axis as compared with the signal input to the still video device. Since the image signal is recorded on the magnetic disk D by expanding the time axis in this way, the input image is divided and stored in the memories 26, 27 and 28 as described below.

FIG. 2 shows a Y memory 26 and an RY memory 27.
And one example of the recording mode of the image signal in the BY memory 28 is schematically shown. In the figure, the number of scanning lines and the position where the scanning lines start on the screen are not accurate. Now, FIG. 2 shows a case where the image signal is recorded in the frame recording mode and the number of scanning lines and the line frequency of the input image are the same as those in the still video format. (However, the band is twice the band defined by the conventional still video.) That is, one screen is composed of the first field and the second field, and the scanning line shown by the solid line in the figure. A1 to A4 indicate the first field, and the broken scanning lines B1 to B4 indicate the second field.
The screen is divided into two by a center line C extending in the vertical direction.

The image signal corresponding to the screen on the left side of the first field is stored in the first area of the memory. The image signal corresponding to the screen on the right side of the first field is stored in the third area of the memory. On the other hand, the image signal corresponding to the left screen of the second field is stored in the second area of the memory, and the image signal corresponding to the right screen of the second field is stored in the fourth area of the memory. The image signals stored in the first to fourth areas are recorded on the first to fourth tracks of the magnetic disk D, respectively.

FIG. 3 shows the relationship between the image signal input to the still video apparatus and the image signal stored on the magnetic disk D. The relationship between the input image signal, the image signals stored in the memories 26, 27 and 28, and the image signal recorded on the magnetic disk D will be described with reference to this figure and FIG.

As described above, in this embodiment, the image signal is recorded in the frame recording mode, so that the image signals of the first and second fields are input for one screen. An image signal forming one field is composed of a large number of horizontal scanning lines H, and an image signal corresponding to one horizontal scanning line H has two horizontal synchronizing signals S as shown in FIG.
Sandwiched between.

In the first field, the leftmost horizontal scanning line H in FIG. 3 consists of image signals A1 and A2, and the second horizontal scanning line H from the left consists of image signals A3 and A4. . The image signals A1 and A3 correspond to the left half of the screen and are stored in the first area on the memory as shown in FIG. The image signals A2 and A4 correspond to the right half of the screen and are stored in the third area on the memory as shown in FIG. That is, when focusing on one horizontal scanning line H, the part corresponding to the left half of the screen is stored in the first area of the memory, and the part corresponding to the right half of the screen is stored in the third area of the memory.
It is stored in the area. Similarly for the second field,
The image signals B1 and B3 corresponding to the left half of the screen are stored in the second area on the memory, and the image signals B2 and B4 corresponding to the right half of the screen are stored in the fourth area on the memory.

The image signals stored in the first to fourth areas of the memory are recorded on the first to fourth tracks of the magnetic disk D, respectively. Therefore, in the first track, one of the horizontal scanning lines of the first field corresponding to the left half of the screen is recorded, and in the second track, the horizontal scanning line of the second field is recorded in the left half of the screen. The corresponding one is recorded. That is, when the first and second tracks are reproduced, the image on the left half of the screen is reproduced, and when the third and fourth tracks are reproduced, the image on the right half of the screen is reproduced. Further, in the magnetic disk in which the image signals are recorded in such a correspondence relationship, even in the conventional apparatus, by reproducing in the frame reproducing mode, it becomes possible to partially reproduce a high-quality image.

The band of the image signal input to the present still video device is f _H , and the image signal is stored in the memories 26, 27 and 28 in this band f _H. When the image signal is read from the memories 26, 27, 28, it is time-axis expanded by a factor of two. That is, the band of the image signal recorded on the magnetic disk D is f _H / 2. The band recorded on the magnetic disk D is determined by the structural reason of the disk device, and it is impossible to record an image signal in a wider band than that. However, in the present embodiment, the image signal is divided with respect to the screen and stored in the memories 26, 27 and 28, the image signal is expanded on the time axis and read from the memories 26, 27 and 28, and the magnetic disk D is read in a predetermined band. Can be stored. Therefore, even if the band of the input image signal is wider than the band of the image signal recorded on the magnetic disk D, the content of the input image signal can be stored in the magnetic disk D as it is, and a high-quality image signal is input. Even if
An image signal can be recorded on the magnetic disk D while maintaining the image quality.

FIG. 4 shows a flow chart of a program for dividing an input image signal of one frame into four fields, storing them in a memory, expanding them on a time axis, and recording them on a magnetic disk D. The input image signal is AD-converted and the memory 26,
In order to be stored in 27 and 28, the input image signal must be sampled at a frequency that is at least twice the band of the input image signal. Therefore, in step 101, the memory clock has a frequency f that is at least twice the band f _H of the input image signal.
_It is set to _SH . This memory clock is generated based on the reference clock signal output from the synchronization signal generation circuit 34. In step 102, the input image signal is AD converted based on the memory clock, and the memory 26,
27 and 28 are written.

Next, at step 103, the memory clock is 1 / the sampling frequency f _SH of the input image signal.
Frequency f _SL of 2. Steps 104-10
At 8, by the frequency _{f SL,} memory 26,2
The image signals of 7 and 28 are DA-converted and recorded on the magnetic disk D. That is, the image signal is time-axis expanded by twice the input image signal and stored on the magnetic disk D.

At step 104, the counter N is "1".
Is set to. In step 105, the magnetic head 11
Is tracked to the Nth track. Then, in step 106, the image signals of the Nth area of the memories 26, 27, 28 are read at the timing of the frequency f _SL ,
It is recorded on the magnetic disk D. In step 107, the counter N is incremented by 1, and in step 108, it is determined whether the counter N is "4" or less. If the counter N is "4" or less, the reading of the image signals of all the areas on the memory has not been completed, and thus step 1
Steps 05 and below are executed again. On the other hand, when the counter N exceeds "4", the reading of the image signals of all the areas on the memory is completed, and this program is completed.

FIG. 5 schematically shows another example of the recording mode of the image signals in the memories 26, 27 and 28. In this figure, the image signal is recorded in the frame recording mode,
Further, the case where the number of scanning lines and the line frequency of the input image are determined in accordance with HDTV (high definition television), for example, high definition, unlike the still video format is shown. That is, one screen is composed of a first field and a second field. In the figure, the scanning line indicated by the solid line indicates the first field, and the broken scanning line indicates the second field. The screen is divided into four parts by a center line E extending in the vertical direction and a center line F extending in the horizontal direction.

The image signal corresponding to the upper left screen of the first field is stored in the first area of the memory, and the image signal corresponding to the lower left screen is stored in the third area of the memory.
An image signal corresponding to the upper right screen of the first field is stored in the fifth area of the memory, and an image signal corresponding to the lower right screen is stored in the seventh area of the memory. on the other hand,
The image signal corresponding to the upper left screen of the second field is stored in the second area of the memory, and the image signal corresponding to the lower left screen is stored in the fourth area of the memory. The image signal corresponding to the upper right screen of the second field is stored in the sixth area of the memory, and the image signal corresponding to the lower right screen is
It is stored in the eighth area of the memory. The image signals stored in the first to eighth areas are recorded on the first to eighth tracks of the magnetic disk D, respectively. The magnetic disk on which the image signals are recorded in such a correspondence relationship can reproduce a high-quality video partially but partially by performing frame reproduction by the conventional device.

FIG. 6 shows the relationship between the input image signal to the still video device and the image signal stored on the magnetic disk D. The horizontal scanning line H of the input image signal is
G2, the image signal G1 corresponds to the left half of the screen,
The image signal G2 corresponds to the right half of the screen. These image signals G1 and G2 are recorded on different tracks on the magnetic disk D, and for example, the image signal corresponding to the upper screen of the first field is recorded on the first track and the fifth track. Further, although the band of the image signal input to the present still video device is f _H , the image signal is time-axis expanded by 4 times when read from the memories 26, 27 and 28. Therefore, the band of the image signal recorded on the magnetic disk D is f _H / 4.

As described above, the present embodiment is configured so that the image signal of one screen is divided into eight areas and stored, and is expanded four times with respect to the time axis and read from the memories 26, 27 and 28. ing. Therefore, the input image signal is H
Even if it is created according to the DTV method, the contents of the input image signal can be stored in the magnetic disk D as it is, and therefore the image signal can be recorded in the magnetic disk D while maintaining high image quality.

FIG. 7 shows a flow chart of a program for dividing an input image signal of one frame into eight fields, storing them in a memory, expanding them on the time axis, and recording them on the magnetic disk D. This flowchart is basically the same as the flowchart in FIG. 4, and the steps correspond to each other. 7, steps corresponding to those in FIG. 4 are shown by adding “10” to the numbers in the steps in FIG. Explaining only the steps with different processing contents, in step 113, the memory clock is set to a frequency f _SL that is ¼ of the sampling frequency f _SH of the input image signal. This is the memory 26, 27, 28
This is for the purpose of recording the image signal stored in the magnetic disk D by expanding the image signal four times in the time axis. Also, step 11
At 8, it is determined whether the counter N is "8" or less. This is because the image signal is stored in eight areas of the memory.

FIG. 8 schematically shows still another example of the recording mode of the image signals in the memories 26, 27 and 28. In this figure, the image signals stored in the respective areas are different from those in FIG. That is, the image signal corresponding to the upper half screen of the first field is stored in the first area of the memory, and the image signal corresponding to the lower half screen is stored in the second area of the memory. The image signal corresponding to the upper half screen of the second field is stored in the third area of the memory, and the image signal corresponding to the lower half screen is stored in the fourth area of the memory.
It is stored in the area.

FIG. 9 shows the relationship between the image signal input to the still video device and the image signal stored on the magnetic disk D in the example of FIG. Horizontal scanning line H of input image signal
Consists of image signals J1 and J2, the image signal J1 corresponds to the left half of the screen, and the image signal J2 corresponds to the right half of the screen. These image signals J1 and J2 are the magnetic disk D.
In the same track. The band of the image signal input to the present still video device is f _H ,
When read out from the memories 26, 27 and 28, the image signal is time-axis expanded by a factor of 2 and the band of the image signal recorded on the magnetic disk D becomes f _H / 2.

In the case of the examples shown in FIGS. 8 and 9, when the image signal recorded on the magnetic disk D is frame-reproduced by the conventional reproducing apparatus, for example, the track in which the first area is recorded and the track in which the second area is recorded are frame-reproduced. , The horizontal scanning lines of the upper half of the screen and the horizontal scanning lines of the lower half of the image appear alternately, and the left and right screens are different for each scanning line, and a normal image cannot be obtained. In order to obtain a normal image, it is necessary to set the method of reading the image signal from the memory so that the predetermined horizontal scanning lines are arranged.

Since a plurality of tracks are used for one screen in the above embodiments, if a plurality of magnetic heads are used for recording the image signal on the magnetic disk D, the number of track movements of the magnetic head can be reduced. It is possible to reduce the number, and it is possible to improve the efficiency of the image signal recording operation.

FIGS. 10 to 13 show an example in which an image signal input to the present still video device is sub-sampled (thinned) and recorded on the magnetic disk D. In this example, the input image signal is recorded in the frame recording mode, and the number of scanning lines and the line frequency of the input image are set according to HDTV or the like.

FIG. 10 is a diagram showing the relationship between subsampling and interpolation. In this figure, the band of the input image signal is f
_H , and this image signal is stored in the memories 26, 27 and 28 as the band f _H. The image signal on this memory is thinned out by half the pixels by sub-sampling, so that the band of the image signal becomes half of the band of the input image signal. On the other hand, when reproducing this image signal,
The image signal is interpolated by a known method, whereby
The decimated image signal is substantially reproduced, and an image having the same image quality as the input image is obtained.

In FIG. 10, for the pixel in the first field, the pixel at the leftmost end of the screen is sampled, the next pixel is decimated, and so on, every other pixel is sampled. . On the other hand, with respect to the pixels in the second field, the pixels at the leftmost end of the screen are thinned out, the next pixel is sampled, and so on, every other pixel is sampled. In this way, the pixels of the input image signal are thinned out evenly on the screen.

FIG. 11 shows the relationship among the input image signal, the image signal recorded on the memory, and the image signal recorded on the magnetic disk 1. In this figure, the band of the input image signal K is f _H , but the image signal stored in the memory is sub-sampled, whereby the band of the image signal becomes f _H / 2. The image signals of the first field and the second field are stored in the first of the memories 26, 27 and 28.
~ Stored by being divided into the fourth area. That is, the image signal corresponding to the upper screen of the first field is stored in the first area of the memory, and the image signal corresponding to the lower screen of the first field is stored in the third area of the memory. Also,
The image signal corresponding to the upper screen of the second field is stored in the second area of the memory, and the image signal corresponding to the lower screen of the second field is stored in the fourth area of the memory.
The image signals stored in the first to fourth areas are recorded on the first to fourth tracks of the magnetic disk D, respectively.

The image signal stored in the memory is doubled on the time axis when recorded on the magnetic disk D, whereby the band of the image signal becomes f _H / 4. Therefore HD
Even the input image signal according to the TV system is written on the magnetic disk D by the still video device while maintaining high image quality.

FIG. 12 shows a flow chart of a program for dividing the input image signal into two and storing them in the memory as shown in FIG. In step 201, the memory clock is set at approximately the same frequency f _'SH and band f _H of the input image signal. This memory clock is equal to an integral multiple of the horizontal line frequency of the input image, and is generated based on the reference clock signal output from the synchronization signal generation circuit 34.
The reason why the frequency of the memory clock is set to be an integral multiple of the horizontal line frequency of the input image is to allow the clock signal to rise at the left end of the screen, and as a result, as will be described later, regarding the first field. ,
Odd number pixels from the left edge of the screen will be sampled. In step 202, the first field of the input image is AD-converted based on this memory clock and written into the memories 26, 27 and 28.

In step 203, the memory clock is inverted. The rising time and the falling time of the memory clock are equal to each other. Therefore, in step 203, a clock signal which is shifted by a half cycle from the memory clock set in step 201 is generated. In step 204, the second field of the input image is AD converted based on the memory clock set in step 203 and written in the memories 26, 27 and 28.

The operation of writing the image signal to the memory in steps 202 and 204 will be described with reference to FIG.
Sampling of pixels of the image signal is performed at the rising edge of the clock signal. Therefore, as indicated by symbol L, in the first field, odd-numbered pixels counted from the left end of the drawing are sampled, and in the second field, even-numbered pixels counted from the left end of the drawing are sampled. The pixels of the first field sampled in this way are stored in the first and third areas of the memory, and the pixels of the second field are stored in the second and fourth areas of the memory.

In step 205, the frequency _f'SL is set. This frequency f ′ _SL is 2 _times the frequency f ′ _SH of the clock signal for writing the input image signal in the memory.
It is one-half and is an integral multiple of the line frequency of still video. The reason why the frequency of the memory clock is set to an integral multiple of the line frequency of the still video is to accurately determine the relative position of the sync signal and the image signal on the magnetic disk.

At step 206, the counter N is "1".
Is set to. In step 207, the magnetic head 11
Is tracked to the Nth track. Then, in step 207, the image signals of the Nth area of the memories 26, 27 and 28 are read out at the timing of the frequency f ′ _SL and recorded on the magnetic disk D (see FIG. 13). In step 208, the counter N is incremented by 1, and in step 209, it is determined whether or not the counter N is "4" or less. If the counter N is "4" or less, the reading of the image signals of all the areas on the memory has not been completed, and therefore steps 207 and subsequent steps are executed again. On the other hand, when the counter N exceeds “4”, the reading of the image signals of all the areas on the memory is completed,
This program ends.

Next, the operation of reading the image signal recorded on the magnetic disk by subsampling from the magnetic disk will be described with reference to FIG. As described above, the image signal is interpolated when reading from the magnetic disk. The pixel obtained by this interpolation corresponds to the pixel thinned out at the time of sampling (the pixel of the code A surrounded by the broken line in the image signal shown by the code L). Therefore, the pixels (symbol 33,
The value of this pixel (A) is obtained by averaging the values of the pixels 35, 24, and 44. Now, the pixels (33, 35) located on the left and right of the pixel (A) are pixels on the same horizontal scanning line, but the pixels (24, 44) located on the upper and lower sides of the pixel (A) are respectively located on the upper and lower sides. Pixels on the scan line. That is, the pixel (24, 4
4) is included in a field different from the pixel (33, 35). In this way, the thinned pixels are restored by interpolation, and therefore, when the image signal recorded on the magnetic disk is reproduced, an image can be obtained with substantially the same resolution as the input image signal.

In addition to the image signal, the magnetic disk stores an ID code relating to the image signal, that is, data such as a recording mode, a photographing date, and a screen division method described later. FIG. 14 shows a track area of the magnetic disk for recording this ID code. In FIG. 2, "H" indicates a horizontal scanning period. The structure itself of this ID code is the same as that used in a conventionally known still video device, and a user's area is provided. In this embodiment, the user's area is used to record the information necessary for automatically performing the screen division, the time axis extension, the image signal reading process, and the like.

FIG. 15 shows a schematic structure of the user's area. As shown in this figure, in the user's area, 2 bits are used to indicate the screen division method, 2 bits are used to indicate the processing method, and 3 bits are used to indicate the screen (memory) area.
Bits and 5 bits are allocated for screen identification. These will be described in detail with reference to FIGS.

FIG. 16 shows information regarding the screen division method. “No division” means a method of recording an image signal on a magnetic disk without dividing the screen, that is, the same recording method as that of a conventional still video device. This "no division"
Is indicated by setting 2 bits to "00". The “division into two” means a method (FIG. 2) of recording the image signal on the magnetic disk by dividing the screen into two by a straight line extending in the vertical direction. This "divided into two" has two bits "0".
Set to 1 ". “Four-division” means a method (FIG. 5) of recording an image signal on a magnetic disk by dividing a screen into four by a straight line extending in the vertical direction and a straight line extending in the horizontal direction. This "4 division" is indicated by setting 2 bits to "10". "H2
“Division” is a method of recording an image signal on a magnetic disk by dividing the screen into two by a straight line extending in the horizontal direction (FIG. 8).
Means This "H2 division" is indicated by setting 2 bits to "11".

FIG. 17 shows information regarding the processing method, that is, the processing method of recording the input image signal on the magnetic disk.
The “normal” means a method of recording an image signal on a magnetic disk without extending the time axis or subsampling, that is, the same recording method as that of a conventional still video device. This "normal" is indicated by setting 2 bits to "00". "Subsampling" is indicated by setting 2 bits to "01". "Time stretch" is indicated by setting 2 bits to "10". "Combining sub-sampling and time axis expansion" is indicated by setting 2 bits to "11".

FIG. 18 shows information related to the screen (memory) area. The information on the screen area indicates to which area of the divided screen the image signal stored in the track on which the ID code is recorded belongs. For example, as shown in FIG. 5, when one screen is divided into four and the image signal is recorded on the magnetic disk in the frame mode, the “first area” is displayed.
~ "Eighth area" has 3 bits of "001",
"010", "011", "100", "101",
It is indicated by setting to “110”, “111”, and “000”. When the screen is divided into four or two, only the information of "first area" to "fourth area" or "first area" to "second area" is used.

FIG. 19 shows information relating to screen identification. The screen identification information indicates to which screen the image signal stored in the track in which the ID code is recorded corresponds. For example, as shown in FIG.
When the image signal is divided and the image signal is recorded on the magnetic disk in the frame mode, there are eight screen areas. That is, in this case, 5-bit information "00001" indicating the "first screen"
There are eight tracks on which is recorded. In this embodiment, the screen identification information is set to record up to 32 types.

Information such as the screen division method, processing method, screen (memory) area and screen identification is DPSK modulated by the ID recording processing circuit 37 (FIG. 1) and recorded on the magnetic disk D. As will be described later, these pieces of information are DPSK demodulated, read from the magnetic disk, decoded, and used for reproducing an image.

FIG. 20 is a block diagram of a reproduction system of the still video device. The system control circuit 10, the magnetic head 11, the spindle motor 12, and the reproducing unit 14 are also included in the recording system shown in FIG. 1, that is, they are both a recording system and a reproducing system.

The magnetic head 11 is located on a predetermined track of the magnetic disk D and reproduces the ID code and the image signal recorded on this track. The reproduction amplifier 41 reads the image signal and the ID code recorded on the magnetic disk D, and outputs the Y reproduction processing circuit 42, the C reproduction processing circuit 43, and the I reproduction processing circuit 43.
It is output to the D reproduction processing circuit 44. The Y reproduction processing circuit 42 FM demodulates and outputs the luminance signal (Y + S) including the horizontal synchronizing signal. The C reproduction processing circuit 43 controls the color difference signal (R-
Y, BY) are FM demodulated and output. The ID reproduction processing circuit 44 DPSK demodulates the ID code and outputs it.

The horizontal synchronizing signal S included in the luminance signal (Y + S) is supplied to the luminance signal (Y + S) by the synchronizing signal separation circuit 45.
S) and is sent to the memory control circuit 46 and the system control circuit 10. The memory control circuit 46, based on the horizontal synchronizing signal S, AD
It controls the converters 47, 48, Y memory 51 and C memory 52. Further, the memory control circuit 46, based on a sync signal from the sync signal generation circuit 53 described later,
It controls the A converters 54, 55, 56, the Y memory 51 and the C memory 52.

Luminance signal (Y + S) including horizontal synchronization signal
Is AD-converted by the AD converter 47, and the luminance signal Y recorded between the two horizontal synchronizing signals is stored in the Y memory 51 under the control of the memory control circuit 46.
The luminance signal Y stored in the Y memory 51 is a synchronization signal (reference clock signal) output from the synchronization signal generation circuit 53.
Based on the above, DA conversion is performed by the DA converter 54.
Similarly, the color difference signals (RY, BY) are converted into the AD converter 48.
Is AD-converted and stored in the C memory 52. The color difference signals (RY, BY) are alternately output from the C memory 52 based on the reference clock signal, but the color difference signals (RY, BY) of the same horizontal scanning line are controlled by the memory control. By the action of the circuit 46, the signals are simultaneously output from the synchronization circuit 57 and input to the DA converters 55 and 56, respectively.
A converted.

The reference clock signal has, for example, twice the frequency of the reference clock signal used for recording the image signal in the memories 51 and 52. Therefore, the image signal is read out from each of the memories 51 and 52 at a relatively high speed, whereby the time axis compression is performed.

Blanking sync mix circuits 61 and 6
Reference numerals 2 and 63 are provided to set a predetermined portion in front of each luminance signal (Y + S) and two color difference signals (RY, BY) to a signal of 0 level and to superimpose a synchronization signal. This blanking sync mix circuit 61, 6
2, 63, a clean sync signal conforming to each system such as HDTV is added in front of these signals. Then, the signals (Y + S), (RY), and (BY) from the blanking sync mix circuits 61, 62, and 63 are input to the image signal processing circuit, and in the video signal processing circuit, for example, HDTV system or high definition. A television signal according to the television system is generated and output to a display device (not shown).

The interpolation processing circuit 64 is a circuit for performing the interpolation processing described with reference to FIG. That is, the interpolation processing circuit 64 calculates the luminance and color difference of the reproduced pixel by interpolation from the luminance and color difference of pixels located around the pixel to be reproduced.

On the other hand, I stored in the magnetic disk D
The D code is subjected to processing such as DPSK demodulation in the ID reproduction processing circuit 44 and decoded by the system control circuit 10. As a result, the system control circuit 10 recognizes information such as the screen division method and reproduces a predetermined image from the divided image signals of the screen areas.

21 and 22 show a flow chart of a program for dividing the image signal with respect to the screen and reproducing the recorded magnetic disk D by time-axis expansion or sub-sampling.

In step 301, the reproduction screen number, that is, the number of the screen to be reproduced is input from the operation unit 14. This reproduction screen number corresponds to the numbers such as the first screen, the second screen ... In the screen identification shown in FIG. In step 302, the magnetic head 11 is positioned on the first track, that is, the outermost track of the magnetic disk D, and in step 303, the counter N is set to "1".

In step 304, the ID of the first track
The code is deciphered. In step 305, based on the content of this ID code, this track is set in step 301.
It is determined whether or not it corresponds to the desired image selected in. If this track does not correspond to the desired image, in step 306 the magnetic head 11
Is moved to the inner side by one track. Then, step 304, until the track of the desired image is found,
305 is repeatedly executed.

When the track storing the desired image is found, the process proceeds from step 305 to step 311 and it is determined from the contents of the ID code whether the processing method (see FIG. 17) is normal, that is, whether the screen is divided. Is determined. If the processing method is normal and the screen is not divided, in step 312, the memory clock is set to the frequency f _SL . This frequency f _SL is a quarter of the frequency f _SH of the clock signal when writing the input image signal in the memories 26, 27, 28 (FIG. 1), and the frequency f _SH at the time of writing is as described above. Is more than twice the band f _H of the input image signal. In step 313,
The image signal is AD-converted based on the memory clock of the frequency f _SL and written in the Y memory 51 and the C memory 52. Next, at step 336, the image signals stored in the memories 51 and 52 are sequentially read out,
It is displayed by a display device or the like (not shown).

When it is determined in step 311 that the processing method is not normal, it is determined in step 314 whether the processing method (FIG. 17) is only subsampling. If the processing method is only sub-sampling, the process proceeds to step 315, and the memory clock is set to the frequency f ′ _SL . This frequency f ′ _SL is approximately one half of the band f _H of the input image signal (see FIG. 12). In step 316, the image signal is AD-converted based on the memory clock of the frequency f ′ _SL , and the Y memory 51
And written in a predetermined area of the C memory 52. At this time, the image signals of the odd-numbered areas (first and third areas, etc.) are written in the odd-numbered columns of the memories 51 and 52, and the even-numbered areas (second
The image signals of the fourth area and the like) are written in the even columns of the memories 51 and 52. As a result, as shown in the lower part of FIG. 13, the array of image signals on the memories 51 and 52 stores pixels in odd areas in odd columns from the left and pixels in even areas in even columns from the left. Stored in.

Next, at step 317, the counter N
Is determined to be equal to "4". In this embodiment,
Since the image signal is recorded on the magnetic disk in the frame recording mode and the screen is divided into two in the case of sub-sampling, four memory areas are used for one screen as shown in FIG. Therefore, when the counter N has not reached “4”, the writing of the image signal of one screen to the memories 51 and 52 has not been completed yet, so the counter N is incremented by one in step 318, and At 306, the magnetic head 11 is moved to the inner peripheral side by one track. Then steps 304 and 305 are executed again,
Steps 311, 314, 315, 3 for desired image
16 is executed and the image signal is written in a predetermined memory area.

When it is determined in step 317 that the counter N is equal to "4", since the writing of the image signal of one screen to the memories 51 and 52 has been completed, the steps from step 334 are executed to display the image. Displayed by the display device. First, in step 334, an empty pixel in the memory, that is, a thinned pixel is interpolated by the pixels located around it (see FIG. 13). In step 335, the memory clock is set to the frequency f _SH . The frequency f _SH is twice the frequency f ′ _SH obtained by sub-sampling the input image signal, that is, f _SH = 2f ′ _SH . Next, at step 336, the image signals stored in the memories 51 and 52 are sequentially read and output to a display device or the like.

If it is determined in step 314 that the processing method is not only subsampling, step 3
21 is executed, and it is determined whether or not the processing method is only time axis expansion. If the processing method is only time-axis expansion, the process proceeds to step 322, where the memory clock is the frequency f.
_It is set to _SL . This frequency f _SL is calculated in step 31.
It is the same as the frequency set in 2. Step 3
At 23, the data is written in the memories 51 and 52 based on the memory clock of the frequency f _SL . Next, at step 324, it is judged if the difference between (the number of screen divisions) and the counter N is larger than "0". When this division number is larger than the counter N, all the image signals have not been written in the memories 51 and 52, so that the process for reading the next image signal from the magnetic disk is performed. That is, the counter N is incremented by 1 in step 318, and steps 306, 304,
305, 311, 314, 321, 322, 323 are executed again, and the next image signal is written in the memories 51, 52 in the same manner as described above.

When it is determined in step 324 that the number of divisions is larger than the counter N, the writing of the image signal of one screen to the memories 51 and 52 has been completed, so steps 335 and 336 are executed and the image is displayed. Is displayed by the display device.

When it is determined in step 321 that the processing method is not only time-axis expansion, the processing method is a combination of sub-sampling and time-axis expansion (FIG. 17). In this case, the memory clock is set to a frequency f _'SL at step 331. This frequency f ′ _SL is approximately one half of the band f _H of the input image signal (see FIG. 12). Next, at step 332, the image signal is AD-converted based on the memory clock of the frequency f ′ _SL and written in a predetermined area of the Y memory 51 and the C memory 52.
At this time, as in step 316, the image signals in the odd areas are written in the odd columns of the memories 51 and 52, and the image signals in the even areas are written in the even columns of the memories 51 and 52.
In step 333, it is determined whether or not the difference between (the number of screen divisions) and the counter N is larger than "0", and the same processing as step 324 is executed. That is, when the number of divisions is larger than the counter N, steps 318, 306,
304, 305, 311, 314, 321, 331, 3
32 is executed, and the next image signal is written in the memories 51 and 52. When it is determined in step 333 that the number of divisions is larger than the counter N, the writing of the image signal of one screen to the memories 51 and 52 has been completed, so steps 334 to 336 are executed and the image is displayed on the display device. Displayed by.

In the above embodiment, the screen division recorded in the user area of the ID code, the time axis extension,
Based on the information about the process of reading the image signal,
Although the reproducing process is performed, a setting unit that can arbitrarily change these settings may be provided and the reproducing process may be performed by the setting unit.

As described above, in the above embodiment, the still video device can record and reproduce an image having a higher image quality than the conventional one. Further, when the image signal recorded on the magnetic disk by the conventional still video device is reproduced by the still video device of the above-described embodiment, a plurality of images on one screen are output, and so-called multi-image display is obtained. Further, the magnetic disk recorded by the recording method according to the present embodiment can reproduce a high-quality image partially, even when reproduced by another conventional video apparatus.

Although the image signal is in the frame recording mode in the above embodiment, it is needless to say that the present invention can be applied to the field recording mode.

[0071]

As described above, according to the present invention, it is possible to obtain an effect that a high quality image can be obtained without changing the band of an image signal recorded on a recording medium such as a magnetic disk.

[Brief description of drawings]

FIG. 1 is a block diagram of a recording system of a still video device to which an embodiment of the present invention is applied.

FIG. 2 is a diagram schematically showing an example of a recording mode of image signals stored in a memory.

FIG. 3 is a diagram showing an example of a relationship between an image signal input to a still video device and an image signal stored on a magnetic disk.

FIG. 4 is a flow chart showing a program for dividing an input image signal into four, storing them in a memory, expanding them on a time axis, and recording them on a magnetic disk.

FIG. 5 is a diagram schematically showing another example of the recording mode of the image signal stored in the memory.

FIG. 6 is a diagram showing another example of a relationship between an image signal input to a still video device and an image signal stored on a magnetic disk.

FIG. 7 is a flow chart showing a program for dividing an input image signal into eight, storing them in a memory, expanding them on a time axis, and recording them on a magnetic disk.

FIG. 8 is a diagram schematically showing still another example of the recording mode of the image signal stored in the memory.

FIG. 9 is a diagram showing still another example of the relationship between the input image signal to the still video device and the image signal stored in the magnetic disk.

FIG. 10 is a diagram showing a relationship between subsampling and interpolation of an image signal.

FIG. 11 is a diagram showing a relationship among an input image signal, an image signal recorded on a memory, and an image signal recorded on a magnetic disk.

FIG. 12 is a diagram in which an input image signal is divided into two and stored in a memory,
7 is a flowchart of a program for sub-sampling and recording on a magnetic disk.

FIG. 13 is a diagram showing an operation of subsampling an input image signal to record it on a magnetic disk and generating thinned pixels by interpolation.

FIG. 14 is a diagram showing a track area of a magnetic disk for recording an ID code.

FIG. 15 is a diagram showing a schematic configuration of a user's area of an ID code.

FIG. 16 is a diagram showing a signal of information regarding a screen division method.

FIG. 17 is a diagram illustrating a signal of information regarding a processing method.

FIG. 18 is a diagram showing signals of information regarding a screen (memory) area.

FIG. 19 is a diagram showing signals of information relating to screen identification.

FIG. 20 is a block diagram of a reproduction system of a still video device to which an embodiment of the present invention is applied.

FIG. 21 is a flowchart of the first half of a program for reproducing an image signal recorded on a magnetic disk.

FIG. 22 is a flowchart of the first half of a program for reproducing an image signal recorded on a magnetic disk.

[Explanation of symbols]

26,51 Y memory 27 RY memory 28 BY memory 52 C memory D magnetic disk (recording medium)

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 20, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

A high-quality image signal obtained by a still video camera (not shown) or an external input terminal (not shown) is a luminance signal (Y + S) and a color difference signal (R-).
Y, B-Y) is input to the still video device. In the figure, the symbol (H) attached to the luminance signal and the color difference signal means high image quality. The horizontal synchronizing signal S included in the luminance signal (Y + S) is separated from the luminance signal (Y + S) by the synchronizing signal separation circuit 21 and sent to the memory control circuit 22 and the system control circuit 10. The memory control circuit 22 uses the horizontal synchronizing signal S
Based on the AD converters 23, 24, 25, Y memory 2
6, controlling the RY memory 27 and the BY memory 28. Further, the memory control circuit 22 uses the DA converters 31, 32, 33, the Y memory 26, and the RY memory 27 based on a sync signal from a sync signal generation circuit 34 described later.
And the BY memory 28 are controlled.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

FIG. 10 is a diagram showing the relationship between subsampling and interpolation. In this figure, the band of the input image signal is f
_H , this image signal is half
Pixels are thinned out and stored in the memories 26, 27 and 28.
Be done. On the other hand , when reproducing this image signal, the image signal is interpolated by a known method, whereby the thinned-out image signal is substantially reproduced, and an image having the same image quality as the input image is obtained.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction content]

In addition to the image signal, the magnetic disk stores an ID code relating to the image signal, that is, data such as a recording mode, a photographing date, and a screen division method described later. FIG. 14 shows a track area of the magnetic disk for recording this ID code. In this figure , "H" indicates a horizontal scanning period. The structure itself of this ID code is the same as that used in a conventionally known still video device, and a user's area is provided. In the present embodiment, this user's area is used to record information necessary for automatically performing screen division, time axis expansion, image signal read processing, and the like.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Change

[Correction content]

FIG. 20 is a block diagram of a reproduction system of the still video device. The system control circuit 10, the magnetic head 11, the spindle motor 12, and the operating section 14 are also included in the recording system shown in FIG. 1, that is, they are both a recording system and a reproducing system.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0055

[Correction method] Change

[Correction content]

Blanking sync mix circuits 61 and 6
Reference numerals 2 and 63 are provided to set a predetermined portion in front of each luminance signal (Y + S) and two color difference signals (RY, BY) to a signal of 0 level and to superimpose a synchronization signal. This blanking sync mix circuit 61, 6
2, 63, a clean sync signal conforming to each system such as HDTV is added in front of these signals. The signals (Y + S), (RY), and (BY) from the blanking sync mix circuits 61, 62, and 63 are, for example,
For example, along with the HDTV system (for example, high definition TV system)
The received television signal is directly input to a display device (not shown).

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0066

[Correction method] Change

[Correction content]

When it is determined in step 324 that the number of divisions is smaller than the counter N, the writing of the image signal of one screen into the memories 51 and 52 has been completed, so steps 335 and 336 are executed and the image is displayed. Is displayed by the display device.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0067

[Correction method] Change

[Correction content]

When it is determined in step 321 that the processing method is not only time-axis expansion, the processing method is a combination of sub-sampling and time-axis expansion (FIG. 17). In this case, in step 331, the memory clock is frequency
It is set to f _'SL. This frequency f ′ _SL is approximately one half of the band f _H of the input image signal (see FIG. 12). Next, at step 332, the image signal is AD-converted based on the memory clock of the frequency f ′ _SL and written in a predetermined area of the Y memory 51 and the C memory 52. At this time, as in step 316, the image signal of the odd number area is stored in the memory 5
The image signals in the odd-numbered columns 1 and 52 are written, and the image signals in the even-numbered areas are written in the even-numbered columns in the memories 51 and 52. Step 3
In 33, it is judged whether or not the difference between (the number of screen divisions) and the counter N is larger than "0", and step 324
Processing similar to is executed. That is, when the number of divisions is larger than the counter N, steps 318, 306, 30
4, 305, 311, 314, 321, 331, 332
Is executed and the next image signal is written in the memories 51 and 52. When it is determined in step 333 that the number of divisions is smaller than the counter N, the writing of the image signal of one screen to the memories 51 and 52 has been completed, so steps 334 to 336 are executed and the image is displayed on the display device. Displayed by.

[Procedure Amendment 8]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

[Procedure Amendment 10]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 20

[Correction method] Change

[Correction content]

FIG. 20

[Procedure Amendment 11]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 21

[Correction method] Change

[Correction content]

FIG. 21

[Procedure Amendment 12]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 22

[Correction method] Change

[Correction content]

FIG. 22

Claims (6)

[Claims] 1. An image signal storage means for dividing an image signal corresponding to one screen into a plurality of pieces and storing the divided image signal in a memory, and a recording medium for time axis expansion of a part or all of the plurality of image signals. Image signal recording means for recording on one or a plurality of tracks of the still video device. 2. The still video device according to claim 1, wherein the information necessary for the division and time axis expansion processing is stored in a portion of the recording medium for recording an ID code. 3. An image signal reproducing means for reading out the image signals of one or a plurality of tracks among the image signals recorded on the tracks of the recording medium by time-axis compression. Still video equipment. 4. The still video device according to claim 3, wherein the information necessary for the reading process is stored in a portion of the recording medium for recording an ID code. 5. The still video device according to claim 1, wherein said image signal recording means thins out pixels to record on the track. 6. The image signals recorded on one or more tracks of the image signals recorded on the tracks of the recording medium are time-axis compressed, and the thinned pixels are substantially reproduced by interpolation and read. 6. The still video device according to claim 5, further comprising image signal reproducing means.