JPS60203087A - Still picture transmitter - Google Patents

Abstract

PURPOSE:To make a transmitter easily handled for a television conference by providing memories for transmission and reception and by switching a picture displayed on a television monitor automatically or manually in accordance with modes such as transmission, reception and recognition of an input picture. CONSTITUTION:When an input video switching device 1 selects a drawing mode by means of a selection signal added to a terminal 20, a selected terminal side records a picture of a drawing camera in a receiving memory 3, and starts transmission in a single shot transmission mode. Simultaneously, a memory switching device 6 operates so as to select the contents of the memory 3, while a drawing picture under transmission is displayed on a television monitor connected to a terminal 23. On the other hand, the drawing picture transmitted from the transmission side is recorded in a receiving memory 5 at a terminal of the receiving side, while a side A of the switching device 6 is selected. At this time, the drawing picture under reception from the terminal 23 is outputted, and transmission and reception sides can view the same picture accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a still image transmission device that transmits television signals via a narrowband transmission path such as a telephone line.

(Prior Art) Conventionally, this type of still image transmission device has only one set of memory used in half-duplex communication, as shown in FIG. At some point, did you receive the image? The sent information was stored in memory after being deleted.

In FIG. 1, 61 is an A/L) converter, 32ii
36 is a memory for transmitting and receiving, 34 is a transmission control unit, and 65 is a D/A converter. This type of still image transmission device does not pose a particular problem for monitoring purposes, but in video conferences that connect remote locations, it is necessary to take the pains to erase the received images and use the human camera. When transmitting images, there is a drawback that it cannot deal with the psychological aspect of not wanting to display one's own face on a television monitor for a long period of time.

In the above applications, half-duplex communication is often used for economic reasons, and the line is always kept in a state where no carrier wave exists, and the side that wants to send out the image presses a button to start sending out each time. There was the inconvenience of not being able to use retrospection effectively.

(Object of the Invention) The object of the present invention is to set up a memory for sending and a memo for receiving, respectively, and to set a mode for sending (document mode or portrait mode), a receiving mode, or A still image transmission device that solves the above drawbacks by switching the image displayed on the television monitor fully automatically or manually when the input image confirmation mode is set, and is configured to be easy to use for video conferencing. Our goal is to provide the following.

(Constitution of the Invention) The still image transmission device according to the present invention includes an input video switcher,
/IJ converter, transmission memory, transmission jll j phloem, reception memory, memory switch, D/A converter,
It is fully equipped with an output video switcher.

The input video switching device is for selecting between a portrait camera and a 14-image camera.

The A/I converter is for converting the video signal selected by the input video switch V into a digital signal.

The transmission memory is for storing image data converted into digital signals by the A/D converter.

The transmission control section encodes the image data to be read from the transmission memory and sends it to the transmission path, and also encodes the data received from the transmission path.

The reception memory is for storing image data encoded by the transmission control unit.

The memory switch is for switching the image data read out at the television rate from the transmitting memory and the receiving memory.

The D/A converter is for converting the image data selected by the memory switch into an analog signal.

The output video switcher outputs the image data from the transmitting memory or the receiving memory that has been converted into a digital analog signal by the D/A converter, or the input video switcher! This is for selecting all of the selected video signals and transmitting the selected video signals to the outside.

(Implementation +1) Next, an embodiment of the still image transmission device according to the present invention will be described in detail with reference to the drawings.

Referring to FIG. 2, one embodiment of the still image transmission device according to the present invention is an input terminal of a portrait camera, or an input terminal of a document camera! An input video switcher 1 for switching and selecting an IM device or a selection signal from all terminals 20, and an A/D converter 2 for converting the video signal selected by the input video switcher 1 into a digital signal. a transmission memory 3 for storing image data that has been converted into digital signals;
The transmission side 1Lt1 section 4 encodes the image data read out from the transmission memory 6 and sends it to the transmission path, or decodes the received data from the transmission path, and the transmission control section 4 decodes the image data. Receiving memory 5 for storing image data
and a memory switch 6 for switching image data read out at television rate from the transmission memory 6 and the reception memory 5.
and A11) converter 7 for converting the image data selected by memory switcher B into analog No. 48, and 1)
Either the image signal from the transmitting memory 3 or the receiving memory 5 converted into an analog signal by the /A converter 7, or the manual camera signal selected by the input video switching device 1 is input from the terminal 24. Select by selection signal,
It consists of an output video switcher 8 for sending out to an external television monitor.

Next, the function and operation of this embodiment will be explained according to FIG.

In FIG. 2, the person camera signal applied to the terminal 21 and the document camera signal applied to the terminal 22 are switched by the input video switching device 1 according to the mode selection signal inputted to the terminal 20, and the selected camera signal is A signal is fed to the converter 2 (A/l).

The A/IJ converter 2 converts the analog signal into a digital signal and supplies it to the transmission memory 6. The transmission memory 6 has a capacity to store one field or one frame of a television signal, and the stored human image or document image can be sent to the transmission line at a speed as fast as possible. The signals are output pixel by pixel, encoded by the transmission control unit 64, converted from parallel to serial, and sent to the transmission line via a modem (not shown) connected to the terminal 25.

On the other hand, data received via the transmission line is input from the terminal 25 to the transmission Hilj tll 7'+54, where it is serial-parallel converted, decoded, and stored in the reception memory 5.
It is supplied to the In the receiving memory 5, at the same time, the data is read out at the television rate so that it can be displayed on a television monitor (not shown), and in the same way as in the transmitting memory 3. The image data is read out at the television rate and input to the memory switch 6 together with the image data. When the signal from the terminal 2° is in a mode other than the calligraphy/image sending mode, the memory switch 6 selects the A side input, that is, the reception memory 5, and only in the case of the calligraphy/image sending mode, the B side input, that is, the sending memory 5 is selected. It operates so that the image data in the trusted memory 6 is selected. Data tri, D/A of the transmitted image, reed or received image selected by the memory switch 6
The converter decodes the signal into a 9-element analog signal and inputs it to the output video switch 8. The output signal of the input video switch 1 is applied to the input on the other side of the output video switch 8.
One of the above is selected by a control signal supplied from the terminal 24, and outputted to a connected television monitor (not shown) via the terminal 26. Normally, when holding a conference, the control signal of the terminal 24 is
11- has been selected, but if you want to check the input image on the television monitor, the output of the input video switching device 1 is supplied to be selected. Before transmitting image data in the transmission control unit 4&C, mode information @ is added to the Herada code to the mode selection signal supplied from the terminal 20, and it is determined whether the mode to be transmitted is portrait mode or calligraphy mode. The information is transmitted to all receiving sides. In the case of the drawing mode, when the transmission of the image is completed for one frame, the transmission stops and the reception is also completed. In the case of the person mode, the transmitting side stops all transmission when the transmission of only one frame is completed, as in the document/drawing mode. However, on the receiving side, when the reception is completed, the image from the person camera at the terminal 210 is transferred to the transmission memory 6.
transmission will start automatically after storage. This operation is performed permanently unless the calligraphy mode is selected on any terminal.

As is clear from the above explanation of the operation, when the selection signal applied to the terminal 2o selects all the human modes at any of the terminals 21 and 22, alternate transmission is automatically performed. At that time, the television monitor connected to the terminal 26 receives and displays the image of the person camera connected to the Ml child 21, 22 in any case. Also, when the selection signal applied to the terminal 2o selects the document mode with the incoming video switch 1, the selected terminal records the document camera image in the transmission memory 6 and starts transmission in the single transmission mode. do. At the same time, the memory switch 6 operates to select B inputs, that is, the contents of the transmission memory 6, and the document image being transmitted is displayed on the television monitor connected to the terminal 26. On the other hand, on the receiving side terminal, the document image transmitted from the sending side is recorded in the receiving memory 5.
The memory switch 6 selects the A side. At this time, the calligraphic image being received from the terminal 26 is completely output, and both edges of the image can be seen on both the sending and receiving sides.

Since it is a one-shot transmission mode, the displayed image is retained on both terminals until the next transmission.

(Effects of the Invention) As explained above, the present invention has a transmitting memory, a receiving memory, and a receiving memory. By automatically or manually switching the image displayed on the television monitor, the transmission mode (document mode or portrait mode), reception mode, or input image confirmation mode can be changed.
It is easy to operate and is ideal for teleconferences and vision conferences where lines can be used effectively.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a still image transmission device according to the prior art. FIG. 2 shows an embodiment of a still image transmission device according to the present invention.
FIG. 1.6,8,32...switcher 2.51-...A/I) converter! ,5. i3...Memory 4.64...Transmission control section 7.65...D/A converter 20-25.40-42...Terminal Patent applicant NEC Corporation Representative Patent attorney Inoro Jusai 1 figure 1 22 figure

Claims (1)

[Claims] an input video switch for selecting a portrait camera or a document camera; an A/D converter for converting the video signal selected by the input video switch into a digital signal; L) A transmission memory for storing all the image data converted into the digital signal by the converter, and encoding the image data read from the transmission memory and sending it to a transmission path, as well as receiving it from the transmission path. a transmission control section for encoding all the data; a second reception memory for storing the image data encoded by the transmission H711(M) section; a memory switch for switching the image data read out by the memory switch; a D/A converter for converting the image data selected by the memory switch into an analog signal; To select all of the image data from the transmitting memory or the receiving memory converted into an analog signal, or the video signal not selected by the input video switching device, and send it to the outside. f6: Characteristic still image transmission device.