JP2002209182A - Method and device for video signal transmission and picture output device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use only a transmission line for transmission of a conventionally band limited moving picture to transmit a signal for still picture besides a signal for moving picture and to easily discriminate between the signal for moving picture and the signal for still picture on the picture output device side to obtain a still picture of high picture quality. SOLUTION: A video signal transmission device is provided with a moving picture signal generation part 30 which generates a signal for the band limited moving picture, still picture signal generation parts 7 and 8 which generate the signal for still picture consisting of component video signals, a transmission signal generation part 29 which multiplexes the signal for moving picture and the signal for still picture in time division to generate a transmission signal, and a discrimination information addition part 30 which adds picture discrimination information for discrimination between the signal for moving picture and the signal for still picture to a prescribed position of the transmission signal, and thus only one transmission line is used to transmit the signal for still picture besides the signal for moving picture, and the signal for moving picture and the signal for still picture are easily discriminated on the picture output device side to obtain the still picture of high picture quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Table of Contents] The present invention will be described in the following order. BACKGROUND OF THE INVENTION Problems to be Solved by the Invention Means for Solving the Problems (FIGS. 1 to 3) Function (FIGS. 1 to 3) Example (FIGS. 1 to 5) Effects of the Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal transmission device and an image output device, and more particularly to a video signal transmission device and an image output device suitable for transmitting a video signal to an image output device that handles still images, such as a video printer or a computer. is there.

[0003]

2. Description of the Related Art Conventionally, for example, a video tape recorder (VTR) has been known as this type of video signal transmission apparatus. VTR
By transmitting the reproduced video signal to an external image output device via a predetermined video terminal, the recorded image can be output by the image output device. A video printer as an image output device extracts a desired one frame from a video signal transmitted from a VTR,
A still image based on the one frame still image is printed. The computer can perform desired image processing based on a still image of one frame of the video signal transmitted from the VTR. Further, if a digital recording type camera-integrated VTR is used as a video signal transmission device, it is possible to have higher resolution video information as an information source.

[0004]

However, no matter how much high-resolution video information can be provided by the digital VTR, the video information is transmitted to the image output device because the bandwidth is limited during transmission. However, the resolution of the video signal eventually decreases. For example, an analog video signal output from a video terminal of a digital VTR is a composite video signal obtained by combining a luminance signal and a chrominance signal, or a separate video signal (a so-called S-video) composed of a luminance signal and a band-limited color difference signal. Signal), and all of them are band-limited. As a result, for example, when the transmitted video signal is a composite video signal, a so-called cross-color or dot failure occurs when the video signal is separated into a luminance signal and a chroma signal. Still images have reduced color resolution.

[0005] As one method of solving such a problem,
In addition to the band-limited moving image signal, the three primary color signals for the still image are recorded in advance, and the three primary color signals for the still image are transmitted together with the moving image signal to the video printer or monitor, so that the video printer or monitor side can be used. There has been proposed a VTR device capable of obtaining a still image without image quality deterioration based on three primary color signals. However, in this VTR device, video printer and monitor, in addition to an RCA connector, a BNC connector or an S connector for a moving image signal, an RGB connector for a three primary color signal is required.
In addition to this, the configuration becomes complicated, and there is a disadvantage that high-resolution still images cannot be transmitted to models other than those having an RGB connector.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and uses only a conventional transmission path for transmitting a band-limited moving image, and uses a component video signal in addition to a band-limited moving image signal. A video signal transmission device and a video signal transmission device capable of transmitting a still image signal as a signal and easily obtaining a high quality still image by easily separating a moving image signal and a still image signal on an image output device side. It is intended to propose a device.

[0007]

According to the present invention, there is provided a moving picture signal generating means for generating a moving picture signal having a band limited from input video signals R, G and B. A still image signal generating means 7 for generating a still image signal composed of component video signals R, G and B from the input video signals R, G and B, and time-division multiplexing of the moving image signal and the still image signal Transmission signal generation means 29 and 30 for generating a transmission signal S8 by performing the operation, and identification information addition means for adding image identification information for identifying a moving image signal and a still image signal at a predetermined position of the transmission signal S8. 33.

In the present invention, the component video signal for a still image is a three-primary-color signal, and the transmission signal generating means 29 and 30 generate the transmission signal S8 by arranging the three primary-color signals in a plane-sequential manner. Then, the identification information adding means 33 adds color identification information for identifying each color of the three primary color signals in addition to the image identification information.

[0009]

The still-image signals R, G, and B, which are composed of band-limited moving image signals and component video signals, are time-division multiplexed, added with image identification information, and transmitted through one transmission path. As a result, the still image signal can be transmitted in addition to the moving image signal using only one transmission path, and the image output device can easily separate the moving image signal and the still image signal to achieve high image quality. Can be obtained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a camera-integrated video tape recorder as a whole (hereinafter referred to as a VTR).
And a still image signal composed of three primary color signals together with a band-limited moving image signal can be transmitted through a composite video output terminal and / or an S video output terminal.

The VTR device 1 uses a recording system 2 having an image pickup section to convert a luminance signal Y and a color difference signal RY from an image pickup signal.
In addition to generating a moving image signal of BY, R (red)
A still image signal composed of G (green) and B (blue) three primary color signals is generated, and the moving image signal and the still image signal are compression-encoded and recorded. The VTR device 1 reproduces the moving image signal and the three primary color signals recorded on the magnetic tape by the reproducing system 3, and adds identification information for identifying the moving image signal and the three primary color signals. Output through a composite video output terminal and / or an S video output terminal.

The recording system 2 converts the image pickup light obtained by the optical system 4 into a CCD.
(Charge Coupled Device) R, G, and B primary color signals are generated by photoelectric conversion in the imaging system 5 and sent to the camera unit signal processing unit 7 via the analog digital conversion circuit (A / D) 6. .

The camera signal processing unit 7 performs signal processing such as automatic white adjustment, black adjustment, gamma correction, and addition of a tail signal on the three primary colors of RGB, and then sends the signals to the RGB frame memory 8 for still images. A built-in matrix circuit generates a luminance signal Y and two color difference signals BY and RY from the RGB three primary color signals, and sends them to the moving picture frame memory 9. Incidentally, in the still image RGB frame memory 8, one frame of video at the moment when the shutter recording button of the user interface unit 10 is pressed is written as data of three frames of RGB three primary color signals.

The data written in the still picture RGB frame memory 8 and the moving picture frame memory 9 is, for example, 8
Blocking is performed on an area of pixels × 8 lines, read out, and sent to the selector 11. The selector 11 selectively sends out still image data D1 or moving image data D2 to the subsequent compression / encoding block 13 based on the recording mode signal S1 from the system controller 12. Here, the recording mode signal S1 sent from the system controller 12
Is output based on an operation signal S2 representing a moving image recording command or a still image recording command from the user interface 10.

The compression / encoding block 13 switches the operation on the basis of the recording mode signal S1, thereby performing a compression / encoding process adapted to each of the input still image data D1 and moving image data D2, and obtained by this. The compressed image data D3 is sent to the error correction code adding circuit 14. On the other hand, the VTR device 1 converts the audio signal S _AUD obtained by the microphone 15 into an analog digital conversion circuit (A / A
D) The signal is output to the audio recording signal processing circuit 17 via 16 and subjected to processing such as interleaving by the audio recording signal processing circuit 17 and then sent to the error correction code adding circuit 14.

The error correction code adding circuit 14 adds an error correction code for error correction during reproduction to the compressed image data D3 and the compressed audio data D4. In addition, the error correction code adding circuit 14 adds additional information (flag signal indicating whether to record still image or moving image) based on the recording mode signal S3 from the system controller 12.

The output of the error correction code adding circuit 14 is sent to a channel coding circuit 15, where channel coding, which is an encoding process for recording on a tape, is performed so that channel coding data D5 is obtained. Generated. The channel coding data D5 is amplified by the recording amplifier 16 and then supplied to the recording / reproducing unit 17. The recording / reproducing unit 17 has a traveling mechanism for traveling the rotating drum and the magnetic tape, and records the data on the magnetic tape by giving the input recording data to the recording head via a rotary transformer. Thus, on the magnetic tape, a luminance signal Y and two color difference signals RY and BY are provided.
, And a still image signal consisting of RGB three primary color signals are recorded together with the audio signal.

The recording data recorded on the magnetic tape in this manner is reproduced by the reproducing system 3. That is, when a control signal S4 for instructing reproduction is input from the system controller 12 to the recording / reproducing unit 17 based on the operation signal S2 from the user interface 10, the reproducing head of the recording / reproducing unit 17 reproduces the recorded data. This is sent to the data extraction circuit 19 via the reproduction amplifier 18. The data extraction circuit 19 extracts the data clock from the reproduction data D6, forms the reproduction data D7 based on the data clock, and sends the reproduction data D7 to the channel decoding circuit 20. The channel decoding circuit 20 performs a process reverse to that of the channel coding circuit 15, and decodes data encoded by the channel coding circuit 15 for recording on a tape.

The error correction processing circuit 21 performs an error correction process to obtain reproduced compressed image data D8, reproduced audio data D9, and reproduced additional information data D10. Of these, the reproduced compressed image data D8 is supplied to a compression / decoding block 22.
The reproduced audio data D9 is converted to an audio reproduction signal processing circuit 23.
And the reproduction additional information data D10 is transmitted to the system controller 12. The audio reproduction signal processing circuit 23 returns processing such as interleaving performed at the time of recording, and supplies the resulting audio data to the audio signal output terminal 25 via the D / A conversion circuit 24.

Based on the reproduction additional information data D10, the system controller 12 provides the compression / decoding block 22 and the selector 26 with a reproduction mode comprising a flag signal indicating whether the reproduced reproduction compressed image data D8 is still image data or moving image data. The signal S5 is transmitted. Thus, the compression / decoding block 22 can perform the compression / decoding processing suitable for each of the still image data and the moving image data on the basis of the reproduction mode signal S5, and the subsequent selector 26 establishes the connection based on the reproduction mode signal S5. By switching, the still image data D12 is supplied to the still image RGB frame memory 27 and the moving image data D13 is supplied to the moving image frame memory 28.

The still picture RGB frame memory 27 and the moving picture frame memory 28 perform deblocking processing for returning the 8 × 8 blocking applied to the input still picture data D12 and moving picture data D13 at the time of recording. And the resulting deblocking data D
14 and D15 are sent to the output signal selector 29. The output signal selector 29 selectively selects the moving image data or the still image data based on the output selection control signal S6 from the system controller 12, and outputs the data to a digital-to-analog converter (D).
/ A) 30. The D / A conversion circuit 30 converts the still image data and the moving image data into analog signals, and identifies the still image signal and the moving image signal based on the output selection control signal S6 from the system controller 12. Is added to the image signal output terminal 3
Feed to 1.

In the case of the embodiment, the still picture RGB frame memory 27, moving picture frame memory 28, output signal selector 29 and D / A conversion circuit 30 are configured as shown in FIG. That is, the RGB three primary color signals for the still image output from the selector 26 are respectively stored in the R channel frame memory 27 of the RGB frame memory 27 for the still image.
The signal components of the moving image data D13 output from the selector 26 are stored in the A and G channel frame memories 27B and B channel frames 27C, and the Y channel frame memories 28A and RY of the moving image frame memory 28, respectively. Channel frame memory 2
8B and the BY channel frame memory 28C.

The output signal selector 29 receives the RGB three primary color signals from the still picture RGB frame memory 27 and the luminance signal Y from the moving picture frame memory 28,
These signals are selectively converted into D / A signals in a predetermined order based on an output selection control signal S6 from the system controller 12.
VBID (Vertical Blanking incl.) Via converter 32
uding aspect ratio Identifications) to the adding unit 33. At this time, the output signal selector 29 outputs the RGB three-primary-color signals for a still image in a frame-sequential manner at a position between the luminance signals Y based on the output selection control signal S6.

The VBID adding section 33 outputs an output selection control signal S
6 based on the video signal (ie, the luminance signal Y from the Y channel frame memory 28A) and the still image signal (ie, the R signal from the RGB frame memory 27 for still image).
Identification data for identifying a moving image signal and a still image signal at a boundary position between the three primary color signals (GB three primary colors).
Identification data for identifying each color is added to the boundary position of each color of the GB primary color signal. Thereby, in the VTR device 1, when the reproduction signal is transmitted to an external image output device (for example, a printer device), the image output device can easily identify the moving image signal and the RGB three primary color signals based on the identification data. , RGB three primary color signals can be easily identified.

The signal S7 to which the identification data is added is Y / C
The signal is sent to the mixing circuit 34 and is also supplied to the luminance signal output terminal 31B of the S video output terminal via the buffer 35. On the other hand, the color difference signals RY and BY output from the moving image frame memory 28 are sent to the chroma signal encoder 38 via the D / A converters 36 and 37, respectively. After being subjected to band limitation, the signal is sent to the Y / C mixing circuit 34 and supplied to the chroma signal output terminal 31C of the S video output terminal via the buffer 39. The Y / C mixing circuit 34 has a VBI
The band-limited chrominance signals RY and BY output from the chroma signal encoder 38 are superimposed on the luminance signal Y included in the signal S7 output from the D adding unit 33, and the resulting composite video The signal S8 is buffered 40.
To the composite video output terminal 31A via the

Thus, in the VTR device 1, the RGB three primary color signals for a still picture can be supplied to the composite video output terminal 31A together with the composite video signal for a moving picture. Similarly, the RGB primary color signals for a still image can be supplied to the luminance signal output terminal 31B of the S video output terminal. As a result, if an image output device such as a printer receives a video output from the composite video output terminal 31A or the S video output terminals 31B and 31C, a high-resolution still image can be obtained together with a moving image.

With this configuration, as shown in FIG. 3, the VTR device 1 can transmit RGB three primary color signals for one still image in a frame sequence within three frame periods between moving image signals. In the case of the embodiment, the identification data for identifying each color of the moving image signal, the still image signal, and the still image signal is identification data inserted at a predetermined position of a vertical retrace period standardized by the Japan Electronics Industry Association. (So-called VBID (Vert
ical Blanking including aspectratio Identification
s)). This VBID data is standardized to be recorded on the 20th line and the 283th line of each frame.

As shown in FIG. 4A, the VBID data is composed of a 6-bit data area WORD0, a 4-bit data area WORD1, a 4-bit data area WORD2, and a 6-bit data area CRC. I have. An identification code representing the transmission aspect ratio and the image display format is assigned to the data area WORD0 (FIG. 4).
(B)).

The VBID adding unit 33 (FIG. 2)
The above-described identification data is allocated to the second and third bits of the data area WORD1 in FIG. 4 (C). As the identification code, as shown in FIG. 4D, when the next arriving data is moving image data, both the second and third bits are set to “0”, and the RGB three primary colors for a still image are used. If the signal is an R channel signal, the second bit is set to "1", the third bit is set to "0", and if the signal is a G channel signal, the second bit is set to "0" and the third bit is set to "1". In the case of a B channel signal, both the second and third bits are set to "1".

As a result, the VTR device 1 identifies the moving image signal and the still image signal in the free space of the VBID data and allocates identification data for identifying each color of the still image signal, thereby reducing the data amount. It is possible to effectively transmit the identification data while suppressing the increase. On the image output device side, by detecting this identification data,
Subsequently, the type of the incoming image signal can be easily identified.

That is, as shown in FIG. 5, in a printer device 50 as an image output device, for example, when a composite video output signal S8 from the VTR device 1 is input, a printer control unit is operated based on an operation signal S20 from a user interface 51. The switch 53 is switched by the switching control signal S21 obtained at 52, and the composite video output signal S8 is supplied to the monitor 54 or the printing unit 55.

The composite video signal S8 supplied to the printing unit 55 is selectively supplied to an R channel frame memory 57A, a G channel frame memory 57B or a B channel frame memory 57C via an A / D conversion circuit 56. At this time, the print unit 55 detects the VBID data added to the composite video signal S8 by the VBID detection circuit 58, and sends the detection signal S22 obtained as a result to the write control circuit 59. The write control circuit 59 receives the R channel frame memory 57A and the G channel frame memory 57B based on the detection signal S22.
And the write operation of the B channel frame memory 57C to control the RG contained in the composite video signal S8.
Each color signal of the B primary color signals is written into the corresponding frame memory 57A, 57B or 57C.

The RGB primary color signals stored in each of the frame memories 57A to 57C are stored in the printer head 6 in a predetermined order.
0, thus obtaining a clear print image based on the RGB three primary color signals. The user can monitor 54
The user can select a still image to be printed while viewing the moving image displayed above.

In the above configuration, the image pickup signal obtained by the image pickup unit of the VTR device 1 is processed by the camera processing unit 7 to output a still image signal consisting of RGB three primary color signals, a luminance signal Y and a color difference signal BY, and The video signal is divided into a moving image signal of R-Y, each of which is compression-coded and then recorded on a magnetic tape by a recording / reproducing unit 17.

The reproduced data reproduced by the recording / reproducing section 17 is decompressed and decoded, and then output signal selector 29.
Sent to The output signal selector 29 outputs a signal for moving image and R
A time-division multiplexing with a still image signal composed of the three primary colors of GB is output. At this time, if you look at only the RGB three primary color signals,
The R component, the G component, and the B component are arranged in a frame sequence within three frame periods. The following D / A converter 30 limits the band of the moving image signal, and sets the moving image signal and the moving image signal at the boundary position between the moving image signal and the still image signal and the boundary position between the colors of the still image signal. A still image signal and identification data for identifying each color of the still image signal are added.

As a result, as shown in FIG. 3, the RGB three primary color signals forming a still image for one frame are frame-sequentially output from the VTR device 1 within three frame periods between the band-limited moving image signals. And identification data for identifying each color of the moving image signal, the still image signal, and the still image signal is transmitted. Thus, the VTR device 1 can output a still image signal composed of three primary color signals in addition to the band-limited moving image signal via the composite video output terminal 31A and the S video output terminals 31B and 31C.

The printer device 50 receiving the composite video output signal and the S-video output signal transmitted in this way displays the moving image signal on the monitor 54 and displays the moving image signal based on the identification data. The RGB still image signal inserted between the image signals is selectively extracted and supplied to the printer head 60 of the printer unit 55. As a result, the user can display a moving image on the monitor 54 and obtain a clear print image based on the RGB three primary color signals.

According to the above configuration, one frame of RGB is provided in a three-frame area between band-limited moving image signals.
By transmitting still image signals composed of three primary color signals in a frame-sequential manner, a high-resolution still image together with a moving image signal can be obtained by using a conventional transmission path for transmitting a band-limited moving image signal. Signals can be transmitted.

At this time, by adding the identification data indicating the boundary position between the moving image signal and the RGB three primary colors signal and the boundary position between the RGB three primary colors, the image output device 50 can easily output the video signal and the video signal. The RGB three primary color signals can be separated and each color of the RGB three primary color signals can be easily separated. As a result, on the output device 50 side, a moving image can be displayed on the monitor 54 and a high-resolution still image can be obtained. Further, the image output device 50 does not require a color decode processing section for obtaining a still image, and the image output device 50 having a simplified configuration can be obtained.

In the above-described embodiment, identification data indicating the boundary position between the moving image signal and the RGB three primary colors and the boundary position between the RGB three primary colors is added to the VBID provided between the fields. Although the case has been described, the present invention is not limited to this, and
You may make it add to places other than D.

In the above-described embodiment, the case where the RGB three primary color signals are used as the still image signal transmitted together with the moving image signal has been described. However, the present invention is not limited to this, and the still image signal may be, for example, a luminance signal. Even when a component video signal composed of a signal and two color difference signals is applied, the same effect as in the above-described embodiment can be obtained.

Further, in the above-described embodiment, the case where the present invention is applied to the video tape recorder 1 integrated with the camera has been described. However, the present invention is not limited to this. The present invention can also be applied to a television camera or the like which transmits a component video signal or a reproducing device which does not have a camera unit and reproduces and transmits a component video signal recorded on a recording medium. .

For example, when the present invention is applied to a reproducing apparatus, a band-limited moving image signal is generated from a component video signal reproduced from a recording medium, and a still image signal which is not band-limited is generated. After that, as in the above-described embodiment, the moving image signal and the still image signal are time-division multiplexed, and identification data for identifying these boundary positions may be added and transmitted.

[0045]

As described above, according to the present invention, a moving image signal generating means for generating a band-limited moving image signal from an input video signal, and a still image signal comprising a component video signal from the input video signal Generating a transmission signal by time-division multiplexing a moving image signal and a still image signal, and a moving image signal and a still image at a predetermined position of the transmission signal. With the provision of identification information adding means for adding image identification information for identifying an image signal, only a conventional transmission path for transmitting a band-limited moving image is used. Signal transmission device capable of transmitting a still image signal in addition to an image signal and easily obtaining a high quality still image by easily distinguishing a moving image signal and a still image signal on the image output device side. It can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of a camera-integrated video tape recorder of one embodiment of a video signal transmission device according to the present invention.

FIG. 2 is a block diagram showing a detailed configuration of the signal output unit.

FIG. 3 is a schematic signal waveform diagram for explaining a video signal transmission system according to an embodiment.

FIG. 4 is a table provided for explanation of allocation of identification data.

FIG. 5 is a block diagram illustrating a configuration of a printer device according to an embodiment.

[Explanation of symbols]

1 ... Videotape recorder integrated with camera, 7 ... Signal processing unit of camera unit, 8, 27 ... RGB frame memory for still image, 9, 28 ... Frame memory for moving image, 29 ...
Output signal selector, 30... Digital-to-analog conversion circuit, 31A... Composite video output terminal, 31B,
31C: S video output terminal; 33: VBID adding section; 34: Y / C mixing circuit; 58: VBID detection circuit.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C053 FA04 FA07 FA21 GA11 GB15 GB21 JA21 JA30 KA03 LA03 5C055 AA01 AA14 BA01 BA03 BA06 BA08 CA03 EA05 FA02 FA22 FA23 5C063 AA01 AB03 AB07 AC01 DA02 DA07 DA13 DB02 DB09

Claims (10)

[Claims] 1. A moving image signal generating means for generating a band-limited moving image signal from an input video signal, and a still image signal generating means for generating a still image signal composed of a component video signal from the input video signal. Transmission signal generating means for generating a transmission signal by time-division multiplexing the moving image signal and the still image signal; and the moving image signal and the still image signal at a predetermined position of the transmission signal. A video signal transmission device comprising: identification information adding means for adding image identification information for identifying the video signal. 2. The component video signal for a still image is composed of three primary color signals. The transmission signal generating means generates the transmission signal by arranging the primary color signals of the three primary color signals in a plane-sequential manner. 2. The video signal transmission device according to claim 1, wherein the information adding unit adds color identification information for identifying each color of the three primary color signals in addition to the image identification information. 3. The video signal transmission according to claim 1, wherein said identification information adding means adds said image identification information within a vertical blanking interval provided between fields of said transmission signal. apparatus. 4. The video signal transmission apparatus according to claim 2, wherein said identification information adding means adds said color identification information within a vertical blanking period provided between each field. 5. An image signal generating step for generating a still image signal comprising a band-limited moving image signal and a component video signal from an input video signal, and converting the still image signal between the moving image signals. A time-division multiplexing step of time-division multiplexing the moving image signal and the still image signal so as to be sequentially arranged; and image identification information for identifying the moving image signal and the still image signal. A video signal transmitting method, comprising: 6. The still image signal comprises three primary color signals.
6. The video signal transmission method according to claim 5, wherein in the identification information adding step, color identification information for identifying each color of the three primary color signals is added in addition to the image identification information. 7. The video according to claim 6, wherein in the identification information adding step, the image identification information and the color identification information are added within a vertical blanking period provided between fields. Signal transmission method. 8. An image output apparatus for outputting a moving image and / or a still image based on an input video signal formed from a band-limited moving image signal and a still image signal composed of a component video signal, Image identification means for identifying the moving image signal and the still image signal based on image identification information for identifying the moving image signal and the still image signal added to the video signal. And an image output means for selectively outputting a moving image or a still image based on the moving image signal or the still image signal identified by the image identifying means. 9. An image output apparatus according to claim 8, wherein said image output means is a printer, and prints a still image based on the still image signal comprising said component video signal. 10. The image output device according to claim 8, wherein said image output means is a monitor device.