JPS6182590A - Picture transmitter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention transmits still images or moving images using ordinary television signals, and transmits still images or moving images to multiple receiving terminals using a single video signal on the receiving side. The present invention relates to an image transmission device that can receive still images or a series of moving images to a predetermined receiving terminal.

[Technical background of the invention]

Traditionally, typical still image transmission methods include:
For example, there is teletext broadcasting, in which a still image signal that has been converted or coded is superimposed and transmitted during the retrace period of a television signal.

This method has advantages such as high transmission efficiency and the ability to transmit without affecting the video that is the main screen.

[Problems with background technology]

However, in this case, if the transmission system does not guarantee that the signal is superimposed on the retrace period, or if the data is encoded and transmitted, the data may change due to noise interference, etc. This may cause some inconvenience in cases where high accuracy is required.

[Purpose of the invention]

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional technology.It is capable of transmitting moving images as well as still images, is resistant to noise interference, can freely transmit figures and natural still images, and can be It is an object of the present invention to provide an image transmission device that has almost no visual influence from inserted still images.

[Summary of the invention]

The image transmission device of the present invention provides, in a standard television signal,
A control signal and a single screen signal of a still image to be transmitted or a control signal and a series of video signals to be transmitted are inserted and replaced with a normal video signal within the video display period, and the receiving side receives the normal TV broadcast signal. In addition to receiving the video using the receiver,
Deciphers the control signal that has been replaced and inserted, selects and separates the corresponding single screen signal in the case of a still screen, and after storing it, repeatedly retrieves it to display the still image, and in the case of a series of video signals, displays the corresponding video signal. It is designed to be selected and displayed as is.

[Embodiments of the invention]

Embodiments of the image transmission device of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of this embodiment. In FIG. 1, 1 is an image transmission control section, and 100h to 100n are receiving terminals, respectively. Since these receiving terminals 100h to 100n have the same configuration, the internal configuration of the receiving terminal 100a is shown in detail as a representative.

The image transmission control section 1 is installed on the sending side, and a still image signal BE and a video signal (moving image) A are introduced into the image transmission control section 1. These still image signals B-E are normal television signals,
Continuation of the same screen.

It is a continuation.

The video signal A is, for example, a normal image output from a television camera or a VTR (video tape recorder).

These still image signals B-4 and video signal A are introduced into the image transmission control section 1. Within this image transmission control section 1, these still image signals BE and video signal A are switched by a switching signal 2a from a switching control circuit 2 and sent to a dirt mix circuit 3. Further, the video signal A is sent to the synchronous reproduction circuit 4.

When the video signal A is introduced, the synchronization reproducing circuit 4 reproduces a synchronization signal and sends it to the clock generation circuit 6 and the switching control circuit 2. The clock generation circuit 6 is designed to generate a clock signal based on this synchronization signal.

The output of the data processing circuit 5 is also introduced into the switching control circuit 2 in addition to the synchronizing signal. A transmission control signal 7 is introduced into the data processing circuit 5. By introducing this sending control signal 7 into the data processing circuit 5, outputs are sent to the switching control circuit 2 and the control no-turn generation circuit 8.

The switching control circuit 2 generates a switching signal 2a according to the switching control data 5a introduced from the data processing circuit 5 and the synchronization signal 4IL introduced from the synchronous playback circuit 4, which is the still image insertion timing, and outputs the video signal A and the still image signal B. -E is switched to insert a still image signal into the video signal and guide it to the r-tomix circuit.

When the control/J-turn generation circuit 8 receives the output of the data processing circuit 5, it sends out the transmission control pattern 8& to the dirt mix circuit 3. An example of this 4-turn 8tL transmission control is shown in FIG.

In this invention, all the data for transmitting the still image signal is within the video signal period, and the retrace period is not used, and a "frame replacement multiplexing method" is adopted in which data is replaced and inserted in one frame between video signals. are doing.

This frame permutation multiplexing method, as shown in Figure 3,
1 for consecutive frames of video signal A (A screen)
Still image signals B, C, D, E (B, C,
D, E screen). The still image frame memories 101B, 10IC, .
111 people monitored reception using regular television receivers (
Video screen A and still screen B), reception monitors 111B to 111
D (still images B to D, respectively) are displayed continuously.

Among these reception monitors 1118 to 111D, which reception monitor receives and displays the replacement screen transmitted from the image transmission control unit 1 is determined by the transmission control pattern shown in FIG. 2, which is sent prior to transmission of the replacement screen. It is determined by the address turn in .

The transmission control device shown in Fig. 2 uses a part of the upper part of the screen to transmit data, and the types are as follows:
There are two types: a queue/book turn that starts reception processing, and an address/book turn that includes address information. Details will be described later.

The method of transmitting the A screen shown in Fig. 3 is 8 screens, C screen,
This is basically the same as the transmission control for the 0 screen, and when the content of the A screen signal is switched at a video switching console (not shown) at the center, transmission control/4' turn is transmitted prior to the switching, and this It is displayed on the reception monitor 111A by selecting according to the address pattern of the transmission control gloss turn.

As is clear from FIG. 2, the transmission control pattern is as follows: There are two types of address patterns that specify the reception monitors 111A to 111D on which the screen display should be performed.

Each address pattern is inserted into the field immediately before the image frame to be replaced. Each address in this field! Turns are inserted at consecutive positions with the same waveform for each scanning line starting from the first scanning line (22H or 284H) of the video signal period. The number of inserted scanning lines is 3 or more and 21 or less.

The configuration of the transmission control/guitar shown in FIG. 2 is as follows. That is, the first key pattern to the third key pattern and address no! Both turns are in the header section (
It consists of an information bit (24 bits), an information bit (25 bits), and a relay bit (1 bit).

In addition, the header section includes a clock line CR (16 bits),
It is composed of framing codes FC (8 bits each).

Furthermore, Addressno! The information bit portion of the turn is provided with a 1-bit information type. This is a code indicating the type of information transmitted in that number of turns.

This information bit section also includes a receiving end unspecified flag, screen type moving picture transmission mode, and spare bits. Among these, the receiving end unspecified flag is the first
It is used to specify the receiving terminals 1θoa to 100n in the figure, and has a 15-bit code structure, with each bit corresponding to each receiving terminal on a one-to-one basis.

The next screen type is a code that specifies the type of screen to be controlled by the pattern, and has a 3-bit configuration.

The video screen transmission mode has a 1-bit configuration, and a reserved bit is provided in case the control contents are expanded in the future, and has a 5-bit configuration.

Here, the explanation returns to FIG. 1 again. In FIG. 1, the transmission control pattern generation circuit 8 sends the transmission control pattern 8a and control signals shown in FIG. It is designed to be introduced into the dirt mix circuit 3 as already described.

This r-) mix circuit 3 inserts a transmission control pattern into the video signal A' into which the still image was inserted in the previous stage, and sends the signal through the transmission system 9 to the receiving terminals 100a to 100n.

Each receiving terminal 100a to 100n is provided with a frame controller 1, and the frame controller 11 includes a control pattern detector 11a, a freeze control section 11b, a clock regeneration circuit 11c, and a synchronous regeneration circuit lid.

Of these, the control pattern detector 11ta detects the transmission control/arm turn from the video signal output from the buffer amplifier 10, and freezes by detecting and decoding the control turn. The control unit 11b is configured to perform freeze control on the moving picture frame memory 101AK and take in data from the still picture frame memories 101B to 10ID.

The video frame memory 101A includes a buffer amplifier 1.
The video signal A output from 0 is stored, and the still image signal B is also stored if necessary. Still image frame memos UlotB to 1010 are arranged to store still images (i-numbers C, D, and E), respectively.

Video signal A stored in the video frame memory 10IA
and still image signal B are sent to the receiving monitor 111A and displayed there. Similarly, the video signals B-E stored in the still image frame memories 10IB-101D are sent to the receiving monitors 111B-111D, respectively, and are busy being displayed there.

Next, the operation of the image transmission apparatus of the present invention configured as above will be explained. A video signal A and still image signals B-E are introduced into an image transmission control section 1 installed on the transmission side. When these video signals A1 and still image signals B-4 are input, a transmission control signal 2 is added. Generation control of the transmission control signal 7, video signal A1, and still image signals BE is performed manually or by a computer.

By inputting the transmission control signal 7 to the data processing circuit 5, the switching control data 5a is sent to the switching control circuit 2,
Control pattern generation data 5b.

is sent to the control/4' tangent generation circuit.

At this time, the video signal A is introduced into the synchronization reproduction circuit 4, where the horizontal synchronization signal is sent to the clock generation circuit 6, and the synchronization signal serving as still image insertion timing is sent to the switching control circuit.

The switching control circuit 2 generates a switching signal 21& according to the switching control data 5& introduced from the data processing circuit and the still image insertion timing synchronization signal 4a introduced from the synchronous playback circuit, and outputs the video signal A and the still image signal B-. E is switched to insert a still image signal into the video signal and lead it to the dirt mix circuit.

In addition, the control/'P turn generation circuit 8 is the data processing circuit 5.
Upon receiving the output, a transmission control pattern 8a shown in FIG. 2 is sent to the ketomix circuit 3.

A control signal is also input to this dirt mix circuit 3.

The c-tomix circuit 3 controls these transmissions)
m, the video signal A' after inserting the still image is mixed according to the control signal and sent to each receiving terminal 100- to 10 through the transmission system 9.
0nI:) Transmit to buffer an f10. At this time,
The transmission control pattern 8a is sent using a screen.

In each of the receiving terminals 100a to Iθθn, the control pattern detector 11m of the 7-frame controller 11 uses the buffer amplifier f1.
According to the address pattern of the transmission control pattern 8a appearing at the output end of o, the address of the receiving terminal is decoded and the receiving terminal address is specified.

If the specified receiving terminal address is 106th,
The control pattern detector 11m of the frame controller 11 of the receiving terminal 100& detects and decodes the control signal, and outputs it to the freeze control section 11b. Thereby, the freeze control unit 11b stores the video signal A appearing at the output terminal of the buffer amplifier 10 in the moving image frame memory 101k. The video signal A stored in the moving picture frame memory 101 is displayed on the receiving monitor 111A.

Each of the receiving terminals 100& to 100n specifies an address using the control nosetan detector 11& of the frame controller 11 in the same manner as described above, and when the receiving terminal 100a is specified, the freeze control unit 11b controls the still image frame 101B.
The still image signals C-E appearing at the output terminals a of the buffer amplifier 10 are taken into the output terminals 101D and 101D, respectively. The still image signal B is input to the moving image frame memory 101A, and when the still image signal B is input, the freeze control unit 11b performs freeze control to control the still image signal B. is stored in 101 video frame memories.

As a result, the still image signals C-E stored in the still image frame memories 101B to 101D are displayed on the receiving monitors 111B to 111D, respectively, and the receiving monitors 111 are shown the video signals as well. Still image signal B
is displayed.

Also, when the corresponding video signal A is input, it is displayed as a moving image on the 111 receiving monitors, but at this time,
If there is no corresponding operation, the still image from the previous still image signal B will continue to be displayed as it is on the receiving monitor 111. Furthermore, if a still image from another screen is inserted between moving images, the still image from the previous still image signal B will be displayed immediately before that. By substituting the frame again, the visual impact of the replaced still image is reduced.

Note that each still image frame memory 10IB to 101D is dedicated to still images, and when a corresponding still image is input, the capture control is performed with K as described above, and the still image is stored. , and output to the reception monitors IIIB to 111D for display.

〔Effect of the invention〕

As described above, according to the image transmission device of the present invention, all the data to be transmitted is within the video signal period and the retrace period is not used, so it is necessary to ensure that the signal is superimposed on the retrace period in the transmission system. Since it transmits still images as they are, it is resistant to noise interference and can freely transmit natural still images such as figures and still photographs.

Furthermore, the still image signal is inserted as a replacement in one frame between video signals, and when the receiving terminal receives a video signal, it is replaced with the previous video frame, so the inserted still image has a visual impact. It has the advantage of being able to transmit videos at the same cost as still images. ”

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the image transmission device of the present invention, Fig. 2 is a diagram showing a configuration example of a transmission control pattern applied to the above image transmission device, and Fig. 3 is applied to the above image transmission device. FIG. 2 is a diagram illustrating a video signal based on a frame replacement multiplexing method. DESCRIPTION OF SYMBOLS 1... Image transmission control part, 2... Switching control circuit, 3.
...Gate mix circuit, 4.116... Synchronous regeneration circuit, 5... Data processing circuit, 6... Clock generation circuit, 8... Control pattern generation circuit, 8a... Transmission control circuit, 9 ...Transmission system, 11...Frame controller, IIa...Pattern control detector, 11b...
Freeze control unit, 100a to 100n...receiving terminal,
101 people...frame memory for video, 1ozB ~ 10
1D...Still image frame, 1118-111D...
・Reception monitor.

Claims (2)

[Claims] (1) An image transmission control unit that replaces and transmits a control signal and a single-screen signal of a still image to be transmitted, or a series of video signals to be transmitted and a control signal within a video display period of a normal video signal; When the still image is received by decoding the replaced and inserted control signal, the corresponding single-screen signal is selectively separated and stored, and after this storage, it is repeatedly retrieved and transmitted to a normal television receiver. An image transmission device comprising a plurality of receiving terminals that display still images on the television receiver and, in the case of receiving the series of moving image signals, select the corresponding moving image and display it as it is on the television receiver. (2) A patent claim characterized in that the receiving terminal once again replaces the replaced still image with the immediately preceding video by decoding the inserted control signal when receiving and displaying a normal video. The image transmission device according to item 1.