JPH06121263A - Recording method for video signal - Google Patents

Abstract

PURPOSE:To synthesize additional information onto a video signal and to separate the additional information from the video signal and to display the video signal onto a screen without deterioration in the resolution by utilizing an excess area of a video recording area of a recording medium as an additional information recording area. CONSTITUTION:When an excess area of an audio area set on a track of a magnetic tape of a digital VTR is N-bits/frame, additional information 32 of mXn=N (a rectangle of m-dots longitudinally and n-dots laterally at maximum) is displayed on a screen. Furthermore, additional control information 33 is recorded to an excess area of a sub code area and the quantity of the additional control information 33 is properly adjusted. The brightness and color indicated by the additional control information 33 are displayed for dots set by the additional information 32 corresponding to the display position and a rectangular size designated by, e.g. the rectangular size and display position when the additional control information 33 is reproduced. Furthermore, the brightness and color for background are displayed for dots cleared by the additional information 32 and the free additional information 32 is synthesized on a picture displayed by an original video signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording method for recording and reproducing additional information which is added to and recorded on a video signal recorded on a recording medium such as a magnetic tape in synchronization with the video signal.

[0002]

2. Description of the Related Art In the conventional method of recording a video signal, the video signal is recorded without changing the video recording area of the recording medium. If the recorded video signal is enlarged and displayed on the screen, the resolution is lowered. The display on the screen becomes unclear.

Therefore, in order to display a clear image without lowering the resolution, the video recording area of the recording medium is widened for recording and reproduction.

In addition, VTR (Video Tape Re)
In a recording method such as a coder), since an area for recording additional information such as subtitles to be combined with the original image is not prepared, the additional information once combined cannot be separated from the video signal together. It was displayed.

[0005]

However, in order to prevent the resolution of the screen display from being lowered, it is necessary to increase the area of the video recording area, which increases the recording area of the recording medium and shortens the recordable time zone. There is a problem that it will end up.

Further, in the prior art, since the additional information such as subtitles is embedded in the video signal in advance and recorded on the recording medium, it is difficult and almost impossible to separate the additional information after the combination. There is a problem to say.

[0007] Therefore, there is a problem to be solved that the resolution of the screen display is not lowered and the additional information such as subtitles can be arbitrarily incorporated into the original video signal and can be easily separated from the original video signal. .

[0008]

In order to solve the above problems, the present invention provides a recording medium having a video recording area for recording a video signal, and a recording / reproducing section for recording and reproducing the video signal on the recording medium. A video signal recording method comprising: a part of the video recording area is secured as an additional information recording area when recording on the recording medium, and any additional information is recorded in the additional information recording area. .

Further, the arbitrary additional information is additional information that does not change with time and little additional information that changes with time with respect to the video signal recorded on the recording medium; the arbitrary additional information is external. From the additional information input area, the input additional information is recorded and reproduced in synchronization with the video signal; the additional information recording area is divided into arbitrary additional information and recorded and reproduced; Displaying any additional information recorded separately in a divided manner on the screen;
A recording medium provided with a memory, which is a method of recording a video signal, wherein a part of the memory is secured as an additional information recording area.

[0010]

When the recording is performed on the recording medium, the additional information is recorded by utilizing the surplus portion of the current video recording area of the recording medium such as the magnetic tape, so that the additional information can be recorded without lowering the resolution. It becomes possible to synthesize and separate the video signal and display it on the screen.

Further, by separately recording and reproducing the original video signal and the additional information, the screen display can combine the additional information with the video signal for display as needed, and the original video signal and the additional information can be displayed. It is possible to change the combination with the information as appropriate.

Further, in the case of a recording medium equipped with a memory, it is possible to increase the amount of recorded information by using the surplus portion of this memory to secure an additional information area.

[0013]

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

In this embodiment, a case will be described in which additional information to be combined by the bitmap method is recorded and reproduced in the format surplus portion of the digital VTR.

FIG. 1 shows the contents recorded / reproduced on the tracks 2 formed on the magnetic tape 1 by the helical scan method. On each track 2, an audio area 3 and a video area 4, Subcode area 5 exists.

Of these, the voice area 3 and the subcode area 5 have a surplus portion. That is, additional information by the bit map method is stored in the surplus portion of the audio area 3, and additional control information for controlling the additional information by the bit map method is recorded in the extra portion of the sub-code area 5.

Next, it is necessary to record and reproduce additional information and additional control information from the surplus portion of the audio area 3 and the subcode area 5 in the track 2 on the magnetic tape 1 by the helical scan method. The configuration will be described with reference to FIGS. 2 and 3.

FIG. 2 is a block diagram showing a configuration required for recording the additional information and the additional control information. The configuration is composed of a composite image information source 6 and a video recording section 7. The video recording unit 7 includes an A / D converter 8, an image compression encoder 9, an error correction encoder 10, an electromagnetic conversion recorder 11, a time axis processor 12, a combiner 13, and timing / Controller 14, sub-code generator 15,
It is composed of a composite 16 and. Of the configuration of the video recording unit 7, the time axis processor 12, the synthesizing unit 13, the timing control unit 14, the sub-code generator 15, and the synthesizing unit 16 are required for additional information to be synthesized with the video signal. It is a thing. Hereinafter, the function and connection state of each component will be described.

The composite image information source 6 is for accumulating additional information to be recorded in advance from a computer, a measuring instrument or the like, and its output side is connected to the input side of the timing controller 14 of the video recording section 7. ing.

The A / D converter 8 converts an analog video signal recorded on the magnetic tape 1 into a digital signal. The input side of the A / D converter 8 is not shown in the drawing, but is a digital VT.
Connected to the video signal terminal for recording on the R magnetic tape 1,
Its output side is connected to the input side of the image compression encoder 9.

The image compression encoder 9 converts the digitized video signal into a predetermined code and compresses it. The input side is connected to the output side of the A / D converter 8 and the output side is erroneous. It is connected to one end on the input side of the correction encoder 10.

The error correction encoder 10 adds redundant bits to the encoded digital signal so as to correct it so as not to cause a problem in appearance, and a plurality of input sides thereof are provided with the image compression encoder 9. And the output side of the composition 16,
It is connected to the output side of the composite 13, and its output side is connected to the input side of the electromagnetic conversion record 11.

The electromagnetic conversion recorder 11 electrically converts error-corrected digital data, and its input side is connected to the output side of the error correction encoder 10 and its output side is magnetically recorded. Connected to the head.

The time axis processor 12 appropriately processes additional information over time in order to record additional information in the surplus portion of the audio area on the magnetic tape 1, and its input side is an audio signal to be recorded on the magnetic tape 1. Connected to the terminal, the output side is composite 1
3 is connected to the input side.

The synthesizing unit 13 synthesizes the additional information from the synthetic image information source 6 with the surplus portion of the audio area which has been processed over time, the input side of which is the output side of the timing controller 14 and the time axis. It is connected to the output side of the processor 12, and its output side is connected to the input side of the error correction encoder 10.

The timing controller 14 controls the additional information and the additional control information from the combined image information source 6 to record the combination of the original video signal and the additional information and the additional control information in the surplus portion of the subcode area. The input side is connected to the output side of the composite image information source 6, and the output side is connected to the composite 16 and the composite 13, respectively.

The subcode generator 15 is for generating a subcode for recording additional control information in the subcode area on the track 2 of the magnetic tape 1.
Its output is connected to the input of synthesis 16.

The synthesizing unit 16 synthesizes the additional information from the synthetic image information source 6 on the basis of the subcode, and its input side is connected to the output side of the subcode generating unit 15 and the output side of the timing control unit 14. , Its output side is connected to the input side of the error correction encoder 10.

The composite image information source 6 and the video recording unit 7 thus configured combine the additional information from the computer, the measuring instrument or the like stored in the composite image information source 6 with the original video signal at the time of recording. Recording on the magnetic tape 1. The details will be described after explaining the configuration and function of the following video reproducing unit 17.

Next, the structure for reproducing the video signal, the additional information, and the additional control information recorded on the magnetic recording medium will be described with reference to FIG.

As shown in FIG. 3, the video reproducing unit 17 includes an electromagnetic conversion reproducing device 18, an error correction decoding device 19, an image compression decoding device 20, a synthesizing device 21, and a D / A conversion device 22. ,
Sub-code device 23 and composite image additional information control device 2
4, a separation 25, a memory 26, a timing controller 27, and a time axis processor 28. Of these, the sub-code device 23, the composite image additional information controller 24, the separation 25, the memory 26, the timing controller 27, and the time axis processor 28 are required for the composite image information. . Hereinafter, the function and connection state of each component will be described.

The electromagnetic converter / reproducer 18 is for electrically converting the recorded information recorded on the magnetic tape 1. The input side is connected to the reproducing magnetic head and the output side is an error correction decoder. It is connected to the input side of 19.

The error correction decoder 19 corrects the reproduced signal from the encoded digital data and removes redundant bits and the like to obtain a digital signal, and its input side is an electromagnetic conversion reproducing device. 18 is connected to the output side, and the output side is connected to the input side of the image compression / decoding device 20, the input side of the sub-code unit 23, the input side of the composite image additional information control unit 24, and the input side of the separation unit 25. There is.

The image compression / decoding device 20 decodes the encoded and compressed signal into a digital signal.
Its input side is connected to the output side of the error correction decoder 19, and its output side is connected to the input side of the combiner 21.

The synthesizing unit 21 synthesizes the video signal and the additional information read from the magnetic tape 1, the input side of which is connected to the output side of the image compression decoder 20 and the output side thereof is D / A converted. The control terminal is connected to the output side of the timing controller 27.

The D / A converter 22 is for converting a digital signal into an analog signal, and the input side thereof is composed 21.
, And the output side is connected to the video signal terminal of the external mechanism.

The sub-code unit 23 stores the additional control information recorded in the surplus part of the sub-code area of the track 2 of the magnetic tape 1, and its connection terminal is the output of the error correction decoder 19. Side and the input side of the composite image additional information controller 24.

The composite image additional information controller 24 controls to combine the additional information and the additional control information of the decoded digital signal with the reproduced original video signal, and its input side is erroneous. The output side of the correction decoder 19 is connected to the terminal of the sub-code unit 23, and the output side thereof is connected to the memory 26 and the timing controller 27.

Separation 25 is for extracting additional information from the surplus part of the voice area in the decoded digital signal, the input side of which is the output side of the error correction decoder 19,
The output side is connected to the input side of the memory 26 and the input side of the time axis processor 28.

The memory 26 is for temporarily saving the extracted additional information and additional control information of the decoded digital signal, the input side of which is connected to the output side of the separation 25 and its output. The side is connected to the input side of the timing controller 27, and the control terminal is connected to the composite image additional information controller 24.

The timing controller 27 generates a timing for combining the additional information temporarily saved in the memory 26 with the reproduced original video signal, and its input side is connected to the output side of the memory 26. , Its output side is connected to the control terminal side of the composite 21, and the control terminal is connected to the control terminal of the composite image additional information controller 24.

The time-axis processor 28 performs a process of restoring the voice signal excluding the additional information extracted by the separation 25 in response to a change with time, and the input side thereof is separated 2.
5 is connected to the output side, and the output side is connected to the audio output terminal side.

The video reproducing section 17 having the above structure is
According to the additional control information extracted by the sub-code unit 23,
It is possible to combine the additional information recorded in the surplus portion of the audio area 3 of the track 2 with the reproduced video signal, and display the video with the subtitles and the like combined on the screen.

Next, the composite image information source 6 and the video recording section 7
With reference to FIGS. 1 to 5, a method of specifically synthesizing the additional information with the video signal will be described for the embodiment of the present invention including the video reproduction section 17.

If the surplus portion of the audio area 3 set on the track 2 of the magnetic tape 1 of the digital VTR is N bits / frame, the maximum height m and width n on the screen will be.
It is possible to have additional information 32 to be displayed on the screen where m × n = N for a rectangular dot.

On the other hand, additional control information 33 is recorded in the surplus portion of the subcode area, and the additional control information 3 is recorded.
3 is, for example, a rectangular size (m × n), a display position,
Magnification, brightness / color, background brightness / color, retention period,
It is composed of a display period, etc., and can be increased or decreased as appropriate.

This additional control information 33 is stored in the video reproduction section 17
When reproduced by, the dot turned on in the additional information 32 corresponds to the brightness / luminance / corresponding to the display position and the rectangle size specified by the rectangle size and the display position.
By displaying the brightness and color of the color and displaying the brightness and color of the background brightness and color on the turned-off dot, the free additional information 32 can be combined with the image displayed by the original video signal. .

Further, the brightness and color of the brightness / color and the background brightness / color are not limited to absolute colors, but may be relative colors to the original image. For example, it is also possible to shift the colors and combine them in comparison with the background color. If this color shift is reduced, a transparent composite image will be obtained.

In order to properly use the absolute color and the relative color,
It is necessary to add information on the color specification method.

Next, with respect to the maximum size N = m × n that can be displayed on the screen, a composite image can be displayed in an area of 2m × 2n = 4N on the screen.

In this case, by controlling the memory holding period of the additional information 32 and the non-display period on the screen for every four frames by the holding period and the display period of the additional control information 33, one frame of additional information is displayed. Even if it is 32, it can be displayed as if there were 4 frames. This method will be described with reference to FIG.

First, in order to display the additional information 32 in every four frames, the synthesizing means required is the screen 2 which can be displayed.
It is premised that the display area 30 for four frames is provided on the display frame 9.

Then, the data A1, B1, C1, D1, A2, B of the additional information 32 which changes sequentially for each frame.
2, C2, D2, A3, ...
Is displayed according to the contents of the display position. Hereinafter, this method will be described in detail.

Further, the additional information 3 that changes for each frame 31
2, the display position 34 of the additional control information 33 is shown in FIG.
As shown in FIG. 4, the values of four display positions on the screen are shown, the holding period 35 secures an area for storing a maximum of 7 frames, and the non-display period 36 stores the stored frames 31. Of these, an area for storing four undisplayed frames is secured.

The operation of the additional control information 33 is as follows.
For each changing frame 31, as shown in FIG. 5, the frames are sequentially stored and processed in a predetermined area.

A method of processing the additional information 32 corresponding to the sequential change of the frame 31 for every four frames will be described with reference to FIGS. 4 and 5.

In # 1 of the frame 31, the data'A1 'of the additional information 32 has the non-display period 36 of the additional control information 33.
It is stored in the rightmost position in FIG. 5 among the four areas secured by a.

At this time, the display position 34 of the additional control information 33
, The display data'a 'is stored in the rightmost position shown in FIG. 5 among the four secured areas.

In this case, although the data'A1 'of the additional information 32 exists in the non-display period 36a and the data'a' is designated at the display position 34, the data shown in FIG. The additional information 32'A at point a on the screen
1'is not displayed and only data is stored.

In this way, from # 1 to # 4 of the frame 31, the data'A1, B1,
C1 and D1 ′ are non-display periods 36a, 36b, 36c,
36d, and the display position 34 stores display position data'a, b, c, d'in order.

Then, at # 5 of the frame 31, the undisplayed data'D1, C1, B1, A1 'stored in the undisplayed periods 36a, 36b, 36c, 36d, 36e moves to the area of the display period 37e. The display position is preset, and only the display position data'a 'is designated.

At the same time, the display data'A2 'of the additional information 32 is stored in the area of the non-display period 36e.

In this way, # 5 and # of frame 31
6, # 7, # 8, the display position data of the display position 34 of the additional control information 33 is'a '→' a, b '→' a,
The display position 34 is designated in the order of b, c '→' a, b, c, d '.

On the other hand, the display periods 37e, 37f, 37g,
37h includes display data “A1” and “B” of the additional information 32.
Since 1 ',' C1 ', and'D1' are stored, when the display position data of the display position 34 is'a ', the display data'A1' is displayed on the screen, and similarly, the display position of the display position 34 is displayed. When the data is'a, b ', the display data'A1, B
When 1'is displayed and the display position data of the display position 34 is'a ', b, c', the display data'A1, B1, C
When 1'is displayed and the display position data of the display position 34 is'a, b, c, d ', the display data'A1, B1, C
1, D1 'is displayed.

At the same time, the non-display periods 36e, 36f, 36
In g and 36h, the display data of the additional information 32 is'A2 '.
→ 'B2' → 'C2' → 'D2' are stored in the order of # 5 → # 6 → # 7 → # 8 of the frame 31.

At the beginning of the so-called 4-frame period of # 9 of the frame 31, the display position 34 becomes the preset display position data'a ', and the non-display period 36e.about.
Display data'A2 of additional information 32 accumulated in 36h,
B2, C2, and D2 'move to the display period 37i, and the display data'A3' of the additional information 32 obtained in # 9 of the frame 31 is stored in the non-display period 36i.

In this way, when four frames are set as one unit, the additional information 3 to be combined on the screen with a delay of one unit.
2 can be displayed in synchronization with each frame. This display method is also preset for each unit of display position data'a '→' a, b '→' a, b, c '→' a,
By displaying in the order of b, c, d ', the area required for the display position data can be minimized.

The so-called screen-displaying speed, which is displayed corresponding to the display position data, is 1/4 of the speed of the original image displayed on the screen. Since the composite image including the information 32 is a still image or an image extremely close to the still image, no inconvenience of the display state occurs even if the display speed becomes 1/4 minutes.

On the contrary, even if the display speed of the additional information 32 displayed on the screen is 1/4 minute, the display of the combined original video signal on the screen can be four times as large. .

Further, the additional information 32 to be combined does not need to be a single color for each additional information 32 for each frame, and a plurality of additional information can be divided into a plurality of colors in one frame by adjusting the rectangular size. You can also

However, the size of the rectangle displayed on the screen becomes smaller accordingly. Then, the additional control information 33 becomes a plurality of sets. Therefore, division is possible as long as the subcode area is free.

The application of the method of recording and reproducing the additional information to be synthesized by utilizing the surplus portion such as the audio area in the video recording area as described above is, for example, in the recording of various experiments in the medical field. It is possible to synthesize the original image while changing the waveforms and numerical values from the container appropriately.

It is also useful to combine foreign language translations and explanations with the original image using educational software or the like, and it is possible to process the synthetic image or characters or the original image with entertainment software or the like. Become.

Furthermore, it is not necessary that the image information is based on the bit map system, and character information based on a character code may be used.

The recording area recorded on the magnetic tape 1 does not need to be a combination of the surplus portion of the audio area and the surplus portion of the sub-code area. Only the surplus part of the area may be used.

In the case of a recording medium equipped with a memory, by securing the surplus portion in the mounted memory, it is equivalent to or more than the use of the surplus portion of the video recording area 2 on the magnetic tape 1. Can exert the function of.

That is, in addition to the effective use of the surplus portion of the memory mounted on the recording medium, both the surplus portion of the memory and the surplus portion of the video recording area 2 of the magnetic tape 1 can be used together. , It becomes possible to display many types of additional information.

The embodiment of the present invention is a digital VT.
Although R is used, it may be an analog VTR, a video disc, a video memory, or a non-standard TV signal such as a video game, and does not need to depend on the storage format or the like.

[0079]

By using the surplus portion of the video recording area recorded on the recording medium as the additional information recording area, it is possible to record additional information such as subtitles without changing the current recording method. In the case of reproduction, it has an extremely excellent effect that it can be displayed on the screen without lowering the resolution.

Further, since the original video signal and the additional information are divided and recorded and reproduced, even the additional information combined with the video signal displayed on the screen, the composite image displayed on the screen can be displayed. It also has an extremely excellent effect that the composition can be appropriately changed and combined or deleted.

Furthermore, the use of the magnetic medium equipped with the memory has an extremely excellent effect that the number of types of additional information can be facilitated.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a state of a recording area recorded on a magnetic tape.

FIG. 2 is a block diagram showing a video recording unit according to the present invention.

FIG. 3 is a block diagram showing the video reproducing unit.

FIG. 4 is an explanatory diagram showing a method of displaying the original video signal and additional information on a screen.

5 is an explanatory diagram showing changes in information for each frame in the display method shown in FIG.

[Explanation of symbols]

 1 magnetic tape 2 track 3 audio area 4 video area 5 subcode area 6 composite image information source 7 video recording unit 8 A / D converter 9 image compression encoder 10 error correction encoder 11 electromagnetic conversion recorder 12 time axis Processor 13 Synthesis 14 Timing control device 15 Sub-code generator 16 Synthesis 17 Video reproduction unit 18 Electromagnetic conversion / reproduction device 19 Error correction decoder 20 Image compression / decoding device 21 Synthesis 22 D / A converter 23 Subcode device 24 Composite image additional information controller 25 Separation 26 Memory 27 Timing controller 28 Time axis processor 29 Screen 30 Display area 31 Frame 32 Additional information 33 Additional control information 34 Display position 35 Holding period 36 Non-display period 37 Display period

Claims (6)

[Claims] 1. A video recording area comprising: a recording medium having a video recording area for recording a video signal; and a recording / reproducing section for recording and reproducing the video signal on the recording medium. Is recorded as an additional information recording area, and arbitrary additional information is recorded in the additional information recording area. 2. The optional additional information is additional information that does not change temporally or additional information that changes little with time with respect to a video signal recorded on the recording medium. Recording method of the described video signal. 3. The video signal according to claim 1, wherein the optional additional information is appropriately input from the outside, and the input additional information is recorded and reproduced in synchronization with the video signal. Recording method. 4. The video signal recording method according to claim 1, 2 or 3, wherein arbitrary additional information is divided and recorded and reproduced in the additional information recording area. 5. The video signal recording according to claim 1, 2, 3 or 4, wherein arbitrary additional information divided and recorded in the additional information recording area is divided and displayed on the screen. Method. 6. A video recording medium according to claim 1, wherein the video recording medium is provided with a memory, and a part of the memory is secured as an additional information recording area. Signal recording method.