JP3255494B2 - Still video equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still video apparatus for dividing one screen into a plurality of screens and recording the divided screens on a recording medium such as a magnetic disk.

[0002]

2. Description of the Related Art A conventional still video apparatus is generally configured to record an image signal of a standard television system (for example, NTSC system) on a track of a magnetic disk in accordance with a still video format. Cannot be increased without limit due to the structure of the disk device. Therefore, even if a high quality image signal, that is, a wideband image signal is input to the still video device, the resolution of the image is limited and the image quality is reduced. Therefore, the applicant has filed Japanese Patent Application No. 3-268104, for example, referring to HDT
As a configuration for recording a high-definition image according to the V system or the like on a magnetic disk by a still video device, one screen is divided into a plurality of lines by a straight line extending in the horizontal direction, and an image signal of each divided screen is recorded on a track. Proposed.

[0003]

Since the horizontal scanning lines forming an image are slightly inclined, the horizontal scanning lines located at the center of the screen are separated by straight lines dividing the screen in the horizontal direction. For this reason, when reproducing and synthesizing the divided images, there is a problem that seams of the divided horizontal scanning lines are generated and appear as noise at the center of the screen.

[0004] This phenomenon will be described with reference to FIGS. In this example, one screen is divided into two by a straight line extending in the horizontal direction. In the upper half of the screen, the image of the first field is recorded from 22H (H is a horizontal scanning period) to 263H, and the image of the second field is recorded from 284H to 525H. The same applies to the lower half of the screen. That is, in the upper screen, the horizontal scanning line of 263H ends in the middle, and in the lower screen, the horizontal scanning line of 284H starts in the middle, and the horizontal scanning lines of 263H and 284H are connected in the center of the screen.

However, since the image signal is recorded on the magnetic disk in the form of an analog signal, the image signal is accurately formed at the end of the horizontal scanning line of 263H and at the beginning of the horizontal scanning line of 284H due to the influence of magnetic characteristics and the like. It may not be recorded on the magnetic disk, or may not be reproduced correctly. For this reason, the joint between the horizontal scanning lines of 263H and 284H may appear on the screen as noise.

The present invention has been made in view of the above problems, and
In a still video apparatus that divides one screen into a plurality of parts by a straight line extending in the horizontal direction and records an image signal of each divided screen on a track, it is possible to prevent noise from being generated at the center of the playback screen due to screen division. It was made for the purpose of.

[0007]

A still video apparatus according to the present invention comprises: means for forming an image of one screen by using a large number of horizontal scanning lines; and means for dividing the one screen into a plurality of screens by lines parallel to the horizontal scanning lines. Means for recording the divided image signals of the respective screens on a recording medium.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a block diagram of a recording system of a still video apparatus to which one embodiment of the present invention is applied.

A system control circuit 10 is a microcomputer, and controls the whole still video apparatus. The disk device has a magnetic head 11 and a spindle motor 12 for rotating and driving the magnetic disk D. The tracking of the magnetic head 11 is controlled by the system control circuit 10, and the magnetic head 11 is displaced along the radial direction of the magnetic disk D. The drive of the spindle motor 12 is controlled by the system control circuit 10, and rotates the magnetic disk D at a rotation speed of, for example, 3600 rpm. While the magnetic disk D is rotating, the magnetic head 1
Numeral 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 counted from the outermost track to the inner circumference.

An operation unit 14 connected to the system control circuit 10 is provided for operating the present still video apparatus. Note that an ID code relating to an image recorded on the magnetic disk D, that is, data such as a recording mode and a shooting date is also input via the operation unit 14. When a recording mode for converting an image signal of the HDTV system into an image signal of the standard television system is selected by an operation of the operation unit 14, information indicating that a recording track is recorded according to such a recording mode is displayed. The ID code is added to the user's area. This information is decoded when the image signal is reproduced.

A high-quality image signal obtained by a still video camera (not shown) or an external input terminal (not shown) includes two color difference signals (RY, BY) and a synchronizing signal. The luminance signal (Y + S) is input to the still video device. This synchronization signal (S) is a composite synchronization signal including a horizontal synchronization signal, a vertical synchronization signal, and an equivalent pulse. In the drawing, the symbol (H) given to the luminance signal and the color difference signal means a wide band, that is, high image quality. The synchronization signal S included in the luminance signal (Y + S) is separated from the luminance signal (Y + S) by the synchronization signal separation circuit 21 and sent to the memory control circuit 22 and the system control circuit 10. The memory control circuit 22
Based on the synchronization signal S, the AD converters 23, 24, 25,
Y memory 26, RY memory 27, and BY memory 2
8 is controlled. Further, the memory control circuit 22 is configured to control the DA converters 31, 32, 33, the Y memory 26, the R-
The Y memory 27 and the BY memory 28 are controlled.

The luminance signal (Y + S) including the synchronization signal is A
The luminance signal Y that has been A / D converted by the D converter 23 and 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 converted by the AD converter 24 into an AD signal.
It is converted and stored in the RY memory 27. The color difference signal (BY) is AD-converted by the AD converter 25,
It is stored in the BY memory 28.

Y memory 26, RY memory 27 and B
The luminance signal Y and the color difference signal (R
−Y, BY) are DA-converted by the DA converters 31, 32, 33, respectively, based on the synchronization signal (reference clock signal) output from the synchronization signal generation circuit 34.
At this time, the reference clock signals are stored in the memories 26, 27, and 28.
For example, it has a half frequency as compared with a reference clock signal used for recording an image signal. Therefore, the image signal is read out from each of the memories 26, 27, 28 at a relatively low speed, whereby the time axis is expanded. Now, the DA-converted luminance signal Y is Y
The data is input to the recording processing circuit 35 and subjected to processing such as FM modulation. The two color difference signals (RY, B-
Similarly, Y) is 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 an ID recording processing circuit 37.

The DPSK-modulated ID code, the FM-modulated luminance signal and the chrominance signal are superposed by an adder 38, amplified by a recording amplifier 13, and sent to a magnetic head 11. Then, the ID code, the luminance signal and the color difference signal are recorded on predetermined tracks of the magnetic disk D by the magnetic head 11. As described above, the signal recorded on the magnetic disk D is expanded in time as compared with the signal input to the present still video device.

In this embodiment, an image signal input to the still video device is sub-sampled (thinned out), stored in the memories 26, 27, 28, expanded in the time axis, and read out from the memories 26, 27, 28. And recorded on the magnetic disk D. This will be described with reference to FIGS. 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 determined according to the HDTV system (high-vision system).

FIG. 2 is a diagram showing the relationship between subsampling and interpolation. Band of the input image signal in this figure f _H
This image signal is stored in the memories 26, 27, and 28 by thinning out half the pixels by subsampling. In reproducing the image signal, the image signal is interpolated by a known method, whereby the thinned image signal is substantially reproduced, and an image having the same image quality as the input image is obtained.

In FIG. 2, for the pixels in the first field, the leftmost pixel of the screen is sampled, the next pixel is thinned out, and similarly, every other pixel is sampled. . On the other hand, as for 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. In this way, the pixels of the input image signal are thinned out uniformly on the screen.

FIG. 3 shows the relationship between an input image signal, an image signal recorded on a memory, and an image signal recorded on a magnetic disk D. The input image signal K corresponds to a horizontal scanning line. On the memory, an image signal K is recorded in each of the recording portions P1, P2, P3,... Extending in the horizontal direction in the figure, and the number R of the recording portions P1, P2, P3,. It corresponds to the number of horizontal scanning lines. That is, the image signal of one frame is stored in order from the head address of the memory, and the address of the memory where the image signal is stored corresponds to the position on the screen of the disk device. This image signal storage operation is performed by the memory control circuit 22.

In FIG. 3, the band of the input image signal K is f
_{Although H} , the image signal stored in the memory is sub-sampled, so that the bandwidth of the image signal is f _H / 2. The image signals of the first field and the second field are divided into first to fourth areas of the memories 26, 27, and stored. That is, the image signal corresponding to the screen above the first field is stored in the first area of the memory,
The image signal corresponding to the screen below the first field is stored in the third area of the memory. 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.

When the image signal stored in the memory is recorded on the magnetic disk D, the time axis is extended by a factor of two, whereby the bandwidth of the image signal becomes f _H / 4. Therefore, HD
Even if the input image signal conforms to the TV system, it is written on the magnetic disk D by the still video device while maintaining high image quality.

FIGS. 4 and 5 show a flowchart of a program for dividing an input image signal into two and storing it in a memory as shown in FIG.

[0023] At step 101, 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 a reference clock signal output from the synchronization signal generation circuit 34. The reason why the frequency of the memory clock is set to an integral multiple of the horizontal line frequency of the input image is to cause the clock signal to rise at the left end of the screen. Thus, the odd-numbered pixels counted from the left end of the screen are sampled. In step 102, the first field of the input image is A / D converted based on the memory clock and written into the memories 26, 27, and 28.

In step 103, the memory clock is inverted. The rising time and the falling time of the memory clock are equal, so that the step 103 generates a clock signal shifted by a half cycle from the memory clock set in the step 101. In step 104, the second field of the input image is AD-converted based on the memory clock set in step 103 and written into the memories 26, 27 and 28.

The operation of writing an image signal to the memory in steps 102 and 104 will be described with reference to FIG. The sampling of the pixels of the image signal is performed at the rise of the clock signal. Therefore, as indicated by the symbol L, in the first field, the odd-numbered pixels counted from the left end of the figure are sampled, and the second field is sampled.
In the field, even-numbered pixels counted from the left end of the figure are sampled. The pixels of the first field sampled in this manner 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.

[0026] In step 105, the memory clock is set to a frequency f _'SL. The frequency f _'SL is the clock signal for writing the input image signal in the memory the frequency f' _SH
And is an integral multiple of the still video line frequency. 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 between the synchronization signal and the image signal on the magnetic disk.

In step 106, the counter N is set to "1".
Is set to In step 107, the magnetic head 11
Is tracked to the Nth track. In step 108, the disc recording routine (FIG. 5) is executed, that is, the image signal of the N region of the memory 26, 27 and 28 are read at the timing of the frequency f _'SL, is recorded on the magnetic disk D (See FIG. 6). This disc recording routine will be described later in detail. In step 109, the counter N is incremented by one, and in step 110, it is determined whether the counter N is equal to or less than "4". When the counter N is equal to or less than “4”, the reading of the image signals of all the areas on the memory has not been completed, and the steps from step 107 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 has been completed, and this program ends.

One screen is divided into two screens by a straight line parallel to the horizontal scanning line. In step 108, image signals of each divided screen are recorded on each track of the magnetic disk D. This operation will be described next with reference to FIGS.

These figures show an example in which, as described with reference to FIG. 3, one screen recorded by the Hi-Vision system is divided into upper and lower parts and recorded on a magnetic disk according to the NTSC system.

As shown in FIG. 7, the screen is divided into two by a straight line C parallel to the horizontal scanning line. Regarding the upper half screen, the image of the first field according to the HDTV system is recorded from 22H to 262H according to the NTSC system on the magnetic disk, and the image of the second field according to the NTSC system is recorded at 284H according to the NTSC system on the magnetic disk. To 525H. The image of the first field of the Hi-Vision system is on the first track,
The image of the second field of the high-vision system is recorded on the second track. For the lower half screen, the image of the first field of the high definition system is from 22H to 263.
H is recorded halfway, and the image of the second field of the high vision system is recorded from 285H to 525H. The image of the first field of the high vision system is recorded on the third track, and the image of the second field of the high vision system is recorded on the fourth track. As described above, the lowermost horizontal scanning line of the upper half screen is recorded on the second track 525H, and is not cut off in the middle. The top horizontal scanning line of the lower half screen is recorded on the third track 22H,
There is no break on the way.

If the horizontal scanning lines of the HDTV system correspond to the horizontal scanning lines of the present embodiment, as understood from FIG. 7, 41H of the image of the first field of the HDTV system is obtained.
To 523H and the second field image 603H to 1085H are recorded on the magnetic disk. The straight line C that divides the screen vertically is located between the first field 282H and the second field 844H in the HDTV system. That is, 41H to 281H of the high-vision system correspond to 2 tracks in the first track of the magnetic disk.
Recorded from 2H to 262H, 282H to 523H
Are recorded from 22H to 263H on the third track. Hi-vision 603H to 844H
Are recorded from 284H to 525H on the second track of the magnetic disk, and 845H to 1085H are recorded on the fourth track.
It is recorded from 285H to 525H in the track.

FIG. 8 shows an image signal corresponding to the upper half screen,
That is, it shows an image signal recorded on the first and second tracks. As shown in this figure, the image of the first field is recorded from 22H to 262H, and no image signal is recorded in the first half of 263H as in the prior art (see FIG. 12). The image of the second field is recorded at 525H from the middle of 284H. Since the image of the second field starts from the top of the screen, it is not connected to the image signals recorded on the other tracks. Therefore, even if the horizontal scanning line starts in the middle of 284H, the noise is displayed in the screen. It does not cause a problem.

FIG. 9 shows an image signal corresponding to the lower half screen,
That is, it shows an image signal recorded on the third and fourth tracks. As shown in this figure, the image of the first field is recorded from 22H to 263H. The image of the second field is recorded from 285H to 525H, and no image signal is recorded in the latter half of 284H as in the related art (see FIG. 12). Since the image of the first field ends at the bottom of the screen, it is not connected to the image signals recorded on the other tracks. Therefore, even if the horizontal scanning line ends in the middle of 263H, noise appears on the screen. It does not cause it to occur.

Next, the contents of the disk recording routine executed in step 108 of the program of FIG. 4 will be described with reference to FIG.

At step 121, the counter N is set to "1".
Is determined. If it is “1”, that is, if an image signal is recorded on the first track, step 1
At 22, the image signal stored in the first area of the memory is read and recorded on the first track of the magnetic disk as the image signal of the horizontal scanning line from 22H to 262H.

If the counter N is not "1", it is determined in step 123 whether or not the counter N is "2". If it is "2", step 124 is executed. That is, an image signal stored in the second area of the memory is read out and recorded on the second track as an image signal of a horizontal scanning line from the latter half of 284H to 525H.

If the counter N is not "2", it is determined in step 125 whether or not the counter N is "3". If the counter N is "3", step 126 is executed. The image signal stored in the third area of the memory is read out and recorded on the third track as an image signal of a horizontal scanning line from 22H to the first half of 263H. If the counter N is not “3”, that is, if it is “4”, in step 127, the image signal stored in the fourth area of the memory is read out, and the image signal of the horizontal scanning line from 285H to 525H is read as the image signal. It is recorded on four tracks.

Steps 122, 124, 126 and 1
In the recording operation of the image signal of the horizontal scanning line in 27, the memory control circuit 22 specifies an address corresponding to the horizontal scanning line determined in each step,
The data stored at the address is read out and sequentially A / D converted to generate an analog image signal. This analog image signal is supplied to the signal processing circuits 35 and 36, the adder 3
8. The data is recorded on the track of the magnetic disk in a predetermined format via the recording amplifier 13 and the magnetic head 11.

In this manner, the image signal is recorded on a predetermined track of the magnetic disk in a manner as shown in FIGS.

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

The magnetic head 11 is located on a predetermined track of the magnetic disk D, and reproduces an ID code and an image signal recorded on this track. The reproduction amplifier 41 reads out the image signal and the ID code recorded on the magnetic disk D, and performs a Y reproduction processing circuit 42, a C reproduction processing circuit 43,
Output to the D reproduction processing circuit 44. The Y reproduction processing circuit 42 FM-demodulates the luminance signal (Y + S) including the synchronization signal and outputs the result. The C reproduction processing circuit 43 outputs the color difference signals (RY, B
-Y) is FM-demodulated and output. ID reproduction processing circuit 44
Outputs the ID code by DPSK demodulation.

The synchronization signal S included in the luminance signal (Y + S)
Is a luminance signal (Y + S) by the synchronization signal separation circuit 45.
And sent to the memory control circuit 46 and the system control circuit 10. The memory control circuit 46 outputs the A / D converter 4 based on the synchronization signal S.
7, 48, the Y memory 51 and the C memory 52 are controlled. The memory control circuit 46 also includes a DA converter 54, 55, 56, a Y memory 51, and a C memory 52, based on a synchronization signal from a synchronization signal generation circuit 53 described later.
Control.

The luminance signal (Y + S) including the synchronization signal is A
The luminance signal Y that has been A / D converted by the D converter 47 and 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 DA-converted by a DA converter 54 based on a synchronization signal (a high-speed reference clock signal according to the HDTV system) output from a synchronization signal generation circuit 53. Similarly, the color difference signals (RY, B-
Y) is A / D converted by the A / D converter 48 and the C memory 5
2 is stored. 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 output.
Are simultaneously output from the synchronizing circuit 57 by the operation of the memory control circuit 46,
5 and 56, and are DA converted.

The reference clock signal has, for example, twice the frequency of the reference clock signal used to record the image signals 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 is compressed.

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. The blanking sync mix circuits 61 and 6
According to 2, 63, a clean synchronization signal S (H) conforming to the HDTV system is added before these signals. Each signal (Y + S (H)), (RY (H)), (B) from the blanking sync mix circuits 61, 62, 63
-Y (H)) is output to a display device (not shown).

The interpolation processing circuit 64 calculates the luminance and color difference of the reproduced pixel by interpolation from the luminance and color difference of the pixels located around the pixel to be reproduced. This interpolation processing will be described with reference to FIG. Pixels obtained by this interpolation are pixels decimated at the time of sampling (pixels of code A surrounded by broken lines in the image signal denoted by code L).
Corresponding to Therefore, by averaging the values of pixels (pixels denoted by reference numerals 33, 35, 24, and 44) located around the pixel (A), the pixel (A) is averaged.
Is obtained. Now, the pixels (33, 35) located on the left and right of the pixel (A) are pixels on the same horizontal scanning line,
The pixels (24, 44) located above and below the pixel (A) are pixels on the horizontal scanning lines located above and below, respectively. That is, the pixel (24, 44) is included in a different field from the pixel (33, 35). As described above, since the thinned pixels are approximated by interpolation, when an image signal recorded on the magnetic disk is reproduced, an image is obtained with substantially the same resolution as the input image signal.

The ID code stored on the magnetic disk D is subjected to processing such as DPSK demodulation in the ID reproduction processing circuit 44 and is decoded by the system control circuit 10.

FIG. 11 shows a flowchart of a program for reproducing the magnetic disk D recorded by dividing the image signal with respect to the screen and expanding the time axis.

In step 201, the reproduction screen number, that is, the number of the screen to be reproduced is input from the operation unit 14. In step 202, the magnetic head 11 is positioned on the first track, that is, the outermost track of the magnetic disk D. In step 203, the counter N is set to "1".
Is set to

In step 204, the ID of the first track
The code is decrypted. In step 205, based on the content of the ID code, this track is stored in step 201.
It is determined whether or not the image corresponds to the desired image selected in. If this track does not correspond to the desired image, the magnetic head 11
Is moved to the inner peripheral side by one track. Step 204 until the track of the desired image is found.
Step 205 is repeatedly executed.

[0051] finds a track that contains the desired image, moves from step 205 to step 211, the memory clock is set to a frequency f _'SL. The frequency f _'SL is one substantially half of the band f _H of the input image signal (see FIG. 4). Next, at step 212, based on the memory clock of the frequency f _'SL, image signals are AD converted, Y
The data is written in a predetermined area of the memory 51 and the C memory 52. At this time, the image signals of the first and third areas are stored in the memory 5
The image signals of the second and fourth areas are written to the odd columns of the memories 1 and 52, and are written to the even columns of the memories 51 and 52.
As a result, the arrangement of the image signals on the memories 51 and 52 is as shown in FIG.
As shown below, the pixels in the first and third regions are stored in odd-numbered columns from the left, and the pixels in the second and fourth regions are stored in even-numbered columns from the left.

In step 213, the difference between the number of memory areas (4 in this embodiment, see FIG. 5) and the counter N is "0".
When the number of areas is larger than the counter N, all image signals are still stored in the memory 51,
Since the data has not been written to the memory 52, processing for reading the next image signal from the magnetic disk is performed. That is,
At step 214, the counter N is incremented by one, and at steps 206, 204, 205,
211 and 212 are executed again, and as described above,
The next image signal is written to the memories 51 and 52.

If it is determined in step 213 that the number of areas is equal to or smaller than the counter N, the writing of the image signal of one screen into the memories 51 and 52 has been completed.
Steps 221 and subsequent steps are executed, and the image is displayed on the display device. First, in step 221, empty pixels on the memory, that is, pixels that have been thinned out,
It is interpolated by pixels located around it (see FIG. 5). In step 222, the memory clock is set to the frequency f
Set to _SH . This frequency f _SH is twice as high as the frequency f ′ _SH obtained by sub-sampling the input image signal, ie, f
It is a _SH = 2f _'SH. Next, in step 223, the image signals stored in the memories 51 and 52 are sequentially read and output to a display device or the like.

As described above, in the present embodiment, one screen is divided by a straight line parallel to the horizontal scanning line, so that the horizontal scanning line is not divided into two at the center of the screen. Absent. Therefore, when the divided images are reproduced and combined, there is no seam of the divided horizontal scanning lines, and there is no possibility that noise is generated at the center of the screen.

Although the image signal is in the frame recording mode in the above embodiment, it goes without saying that the present invention can be applied to the field recording mode.

[0056]

As described above, according to the present invention, when one screen is divided into a plurality of parts by a straight line extending in the horizontal direction, and the image signals of each divided screen are recorded on a track,
This has the effect of preventing the generation of noise due to screen division on the playback screen.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a relationship between sub-sampling and interpolation of an image signal.

FIG. 3 is a diagram showing a relationship between an input image signal, an image signal recorded on a memory, and an image signal recorded on a magnetic disk.

FIG. 4 is a flowchart of a program for dividing an input image signal into two for each field, storing the divided signals in a memory, sub-sampling and recording the data on a magnetic disk.

FIG. 5 is a flowchart of a disc recording routine.

FIG. 6 is a diagram illustrating an operation of sub-sampling an input image signal and recording the sub-sampled image signal on a magnetic disk, and generating a thinned-out pixel by interpolation.

FIG. 7 is a diagram showing the correspondence between horizontal scanning lines recorded on a magnetic disk and high-definition horizontal scanning lines according to an embodiment of the present invention.

FIG. 8 is a diagram showing an image signal corresponding to an upper half screen.

FIG. 9 is a diagram showing an image signal corresponding to a lower half screen.

FIG. 10 is a block diagram of a reproduction system of a still video device to which an embodiment of the present invention has been applied.

FIG. 11 is a flowchart of a program for reproducing an image signal recorded on a magnetic disk.

FIG. 12 is a diagram showing an image signal recorded on a magnetic disk by a conventional device.

FIG. 13 is a diagram showing a relationship between a horizontal scanning line recorded on a magnetic disk and a screen by a conventional device.

[Explanation of symbols]

 26, 27, 28 Memory D Magnetic disk (recording medium)

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-207091 (JP, A) JP-A-63-276985 (JP, A) JP-A-2-112391 (JP, A) JP-A-5-215 30461 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H04N 5/76-5/956 H04N 101: 00

Claims (1)

(57) [Claims] A means for forming an image of one screen by a large number of horizontal scanning lines; dividing the one screen into a plurality of screens by lines parallel to the horizontal scanning lines; Means for recording on a recording medium , wherein the recording medium
The body has a plurality of tracks for recording image signals,
The image signal of the first field of each of the divided screens is
An image signal of two fields is adjacent to the recording medium.
A still video device recorded on a track .