JPS61218287A - Still picture television conference equipment - Google Patents

Abstract

PURPOSE:To progress smoothly a conference by scanning and reading out alternately and simultaneously in order a frame of a picture signal that is accumulated at a picture signal accumulating circuit, one side to the direction of the first half of the frame and the other to the direction of the latter of it from the center of the frame. CONSTITUTION:The first picture signal read-out indicating circuit 6 receives a write completion information from the first picture signal write indicating circuit 5 and controls the simultaneous and in order scanning and read-out of the picture signal that is written at the first picture signal accumulating circuit 3 to the direction the first half of the frame and to the latter direction of it from a horizontal center line of the frame. A transmitting signal that is received at the receiving input terminal 10 of an opposite conference room is inputted to the second picture signal accumulating circuit 12 and also, is scanned and written alternately, simultaneously and in order to the direction of the first half and the latter half of the frame from the horizontal center line of the frame in the same way that a received picture signal is read out from the first picture signal accumulating circuit 3 of a transmission side.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a still image television conference device, and in particular to a still image television conference device that stores 7'! - A still image television conference device configured to read out one frame of image signals from arbitrary coordinates, and on a receiving side, store the image signals read out on a transmitting side as they are and sequentially read them from the beginning of the frame.

(Prior Art) Conventionally, a still image television conference device stores the one-frame image signal necessary for transmitting the output image signal of the television camera to the other party's conference room, and stores it in the storage circuit at the beginning of each frame. After 9 days, the stored image signals are stored and simultaneously read out sequentially from the beginning of the frame and sent out to the transmission path, and the receiving side receives the received one frame image signal in the same way as the transmitting side. It was stored, read out, and played back on the Weiwei device.

(Illumination point to be solved by the invention) In a television conference, multiple attendees are imaged by one television camera, and the next image signal is generally the center of 1c1 frame (2/4 frame). The human figure occupies the first half of the frame (the upper part of the screen is 1/4 frame),
The i half of the frame is the floor (the bottom part of the screen is the sol/4 frame)
It consists of:

In other words, the image information that needs to be transmitted to the other party's conference room during a conference is concentrated in the center of the frame, y2/4, and the other 27'4 frames are, to say the least, unnecessary. This is great information.

In the above-mentioned conventional still image television conference device, when reading out the image signal to be sent to the other party's conference room, the stored image signal is sequentially scanned from the beginning of the frame, read out, and then sent out. However, there was a drawback that it took a long time for the information needed in the other party's conference room (the 2/4 square in the center of the frame) to be reproduced on the receiving device.

Originally, still images were transmitted using a low-speed transmission method, and it took a long time to play back the information necessary for the meeting, so it took extra time to update the screen during the meeting, making it difficult for the meeting to proceed smoothly. The drawback was that it was impossible to do so, making it difficult to improve time efficiency.

An object of the present invention is to transmit image signals of 91 frames from the center of the frame, which are once accumulated in an image signal storage circuit when transmitting an image signal from the transmitting side, from the center of the frame to the left half of the frame, and from the other side to the left half of the frame. To provide a still image television conference device configured to eliminate the above-mentioned drawbacks and to smoothly carry out the conference by scanning and reading data alternately and simultaneously sequentially in the direction of the second half or right half of the frame. It is in.

(Means for Solving the Problems) The still image television conference apparatus according to the present invention is equipped with a transmission section and a reception section of the Eirin system in nine separate conference rooms.

The transmitter includes a first storage means and a first read instruction means. The first storage means is for sequentially storing any one frame of the image signal of the television camera to be sent to the other party's conference room from the beginning of the frame. The first readout instruction means is for instructing the first storage means to read out the image signal of one frame stored in the first storage means from a specific coordinate in the horizontal or vertical direction.

The receiving section includes a second storage means and a second read instruction means. The second storage means is for storing the next image signal received from the transmitter in the same order as the readout operation in the first readout instruction means. The second readout instruction means is for sequentially reading out the next image signal stored in the second storage means from the beginning of the frame.

(Example> Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing a video system on the transmitting side in an embodiment of a still image television conference apparatus according to the present invention, and FIG. 2 is a block diagram showing a receiving system thereof. In FIG. 1, 1-a to 1-n are television cameras, 2 is an image signal switching circuit, 3 is a first image signal storage circuit, 4 is a conference mode control circuit, and 5 is a first image signal a write instruction circuit; 6 a first image signal read instruction circuit;
7 is a synchronization signal generation circuit, and 8 is a first transmission line interface circuit.

In FIG. 2, 11 is a second transmission line interface circuit, 12 is a second image signal storage circuit, 13 is a drive circuit, 14 is a second image signal write instruction circuit, and 15 is a second image signal read instruction circuit. The circuits 6-a to 16- are image receiving devices, respectively.

In FIG. 1, a plurality of image signals captured by television cameras 1-a to 1-n are applied to an image switching circuit 2, and one image signal is output according to a control signal from a conference mode control circuit 4. It is selected and connected to the first image signal storage circuit 3.

At the same time, the first image signal write instruction circuit 5 is driven by the control signal from the conference mode control circuit 4, and the first image signal storage circuit 3 is driven by the write instruction signal from the first image signal write instruction circuit 5. ] Accumulate the image signal of the frame.

The first image signal read instruction circuit 6 receives write end information from the first image signal write instruction circuit 5, and reads the next image signal written into the first image signal storage circuit 3 from the horizontal center line of the frame. Control is performed so that the first half and the second half of the frame are simultaneously sequentially scanned and read.

The image signal of the 91st frame read out as described above is the first
It passes through the transmission line interface circuit 8 and is sent out from the transmission output terminal 9 to the transmission line.

In the synchronization signal generation circuit 7, the television camera 1-a~
A first image signal write instruction circuit 5 and a first image signal read instruction circuit 6 generate synchronization signals for external synchronization of 1-H and write/read timing signals.
It also supplies a synchronization signal.

The transmission signal received at the reception input terminal 10 of the other party's conference room is input to the second image signal storage circuit 12 via the second transmission line interface circuit 11, and is also input to the second image signal write instruction circuit. 14 and a drive circuit 13 for driving a second image signal readout instruction circuit 15 . The second image signal write instruction circuit 14 operates in response to the control signal from the drive circuit 13, and the received image signal is converted into the first image on the transmitting side by the write instruction signal from the 20th image signal write instruction circuit 14. The signals read from the signal storage circuit 3 are sequentially scanned and written from the horizontal center line of the frame toward the first half of the frame and the second half of the frame alternately and simultaneously.

The second image signal read instruction circuit 15 receives write completion information from the second image signal write instruction circuit 14, reads out the information using a normal scanning method, and reproduces it to the lightning receiving devices 16-a and 16-b.

FIG. 3 shows television cameras 1-a to 1-n on the transmitting side.
FIG. 3 is an explanatory diagram showing the scanning state of writing an image signal into the first image signal storage circuit 3 and reading out a received image on the receiving side from the second image storage circuit 12. In Figure 3, writing/writing is done sequentially from the beginning of the frame in the direction of the arrow.
This shows how reading is executed.

FIG. 4 is an explanatory diagram showing the scanning state of reading the stored image signal on the transmitting side from the first image signal accumulating circuit 3 and writing the received image signal on the receiving side to the second image signal accumulating circuit 2. It is. FIG. 4 KTh shows how reading/writing is simultaneously executed in the direction of the arrow from the horizontal center line of the frame to the first half and the second half of the frame.

As described above, the present invention employs simultaneous reading and writing from the horizontal center line of the frame to the first half and the second half of the frame, as shown in FIG. 4, but as shown in FIG. It is also easy to alternately and sequentially read out each pixel from the center of the scanning period in the left and right directions, and then write.

(Effects of the Invention) As explained above, when the present invention transmits an image signal from the transmitting side, the image signal of 1 frame once accumulated in the image signal storage circuit is transferred from the center of the frame to the first half of the frame or the left side of the frame. By sequentially scanning and reading one half of the frame, the other half of the frame is scanned alternately and the right half of the frame.
Highly important information in the center of the frame can be efficiently sent to the other party's conference room and reproduced in the same way on the receiver in the other party's conference room, allowing the conference to proceed smoothly. There is an effect that it can be done.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a video system on the transmitting side of a television conference apparatus according to the present invention. FIG. 2 is a block diagram showing a video system on the receiving side of the television conference apparatus according to the present invention. 3 to 5 are conceptual diagrams each showing a method for writing/reading an image signal of one frame into an image signal storage circuit. 1-a-1-n...Television camera 2...Image signal switching circuit 3.12-...Image signal storage circuit 4...Conference mode control circuit 5.14...Image signal read instruction Circuit 6.15...
Image signal readout instruction circuit 7...Synchronization signal generation circuit 8.11-...Transmission line interface circuit 13...
Drive circuits 16-a, 16-b...Image receiving device 9.10-...Terminal Patent applicant NEC Corporation Representative Patent attorney Hisashi Inoro Figure 23 Figure 24

Claims (1)

[Claims] A still image television conference device comprising a video transmission section and a reception section in conference rooms separated from each other, wherein the transmission section transmits an arbitrary image signal of a television camera to a conference room on the other side. a first accumulating means for sequentially accumulating one frame from the beginning of the frame; and a first accumulating means for reading out one frame of image signal accumulated in the first accumulating means from a specific coordinate in a horizontal direction or a vertical direction. a first readout instructing means for instructing, and a first readout instructing means for accumulating the image signal received by the receiving section from the transmitting section in the same order as the readout operation in the first readout instructing means. 1. A still picture television set comprising: a second storage means; and a second readout instruction means for sequentially reading out the image signals stored in the second storage means from the beginning of a frame. John conference equipment.