JPH10271472A - Multispot communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out video conference vis-a-vis with the talking partner party by displaying the image data of the terminal of the party under simultaneous communication at the central part of the terminal screen even when the data are divided images by displaying the divided display contents on the central parts of respective terminal screens. SOLUTION: When respective display images (a)-(c) are displayed on screen (d) by dividing the screen (d) into four parts in a multispot communication system for performing simultaneous communication among four terminals, images on these screens are displayed somewhat deviated in comparison to the original. Accordingly, four divided display images are displayed (e) by shifting the display images divided into four to the approximate central part of the screen (d) so that the image data can be displayed at the almost central parts of respective display screens. Since the respective display images are shifted respectively in the directions (f) to the central part, the image data at respective four divided display parts are displayed respectively at the centers of the screens. By dividing the terminal screen into four parts and respectively displaying them toward the central part of the terminal screen, smooth conversation with the speaker on the partner terminal can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system in which communication is performed between a plurality of communication terminals using image data, and more particularly, to one terminal when a multipoint video conference is held between three or more communication terminals. The present invention relates to a multipoint communication system capable of simultaneously displaying image data from a plurality of communication terminals on a screen.

[0002]

2. Description of the Related Art In a conventional multipoint communication system,
There is an application filed by the present applicant in Japanese Patent Application No. 8-135736. According to this application, among a plurality of communication terminals performing simultaneous communication, at least one terminal has a function like a channel control circuit, that is, an MCU, so that the display screen of the communication terminal is divided into four parts to perform simultaneous communication. Images of four or less of the plurality of communication terminals can be simultaneously displayed on one terminal screen.

[0003]

In such a conventional multipoint communication system, image data from a plurality of communication terminals simultaneously communicating with one terminal screen is simultaneously used without using an expensive MCU. It is described that it can be displayed. However, Japanese Patent Application No. 8-135736
Unfortunately, the description states that image data from a plurality of communication terminals simultaneously communicating with each other is displayed on a single terminal screen in four divisions. However, according to such a 4-split screen, an area originally viewed on the screen may not be visible due to the display characteristics of the television monitor. Therefore, the present invention enables the image data of the partner terminal simultaneously communicating with the television monitor to be displayed at the center even if the divided screen is displayed, so that a video conference can be held with the partner facing each other.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and image data communication is performed between a plurality of communication terminals via a communication line, and a display screen of the communication terminal is displayed. In a multipoint communication system capable of simultaneously displaying, on one terminal screen, images related to four or less communication terminals among a plurality of communication terminals that are simultaneously communicating by dividing into four, the four divided display contents are respectively Provided is a multipoint communication system for displaying a message at a center of a terminal screen.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a multipoint communication system of the present invention, FIG. 2 is a diagram illustrating a communication format used in the multipoint communication system of the present invention, and FIG. FIG. 7 is a diagram illustrating a display position of a monitor screen to be displayed. FIG. 1 is a diagram in which a terminal T ₀ is simultaneously communicating with three terminals T _{1 to} T ₃ via a network 1. Since the terminals T ₀ to T ₃ have the same configuration, the configuration of the terminal T ₀ will be described. 2 ₁ 2 _n is the line I / F, 3 ₁ to 3 _n is a demultiplexing, 4 and PSC detector, and 5 ₁ to 5 ₃ buffer, 6 a control unit, 7 a decoder , 8 are encoders,
9 comprises a DRAM. The display unit is omitted.

In FIG. 2, these terminals T _{0 to} T ₃
The transfer format when the data is transferred between and will be described. This transfer format is ITU-T H261
It is based on recommendations. In this transfer format, 10 is PSC, 11 is TR, 12 is PTYPE,
13 is PEI, 14 is PSPARE, 15 is GOBla
yer. The PSC 10 has a 20-bit configuration and is a delimiter code for one screen. TR1
1 stores the number of dropped frames in the corresponding frame. The PTYPE 12 stores information on whether the corresponding frame is QCIF or CIF. The PEI 13 stores information for identifying the presence / absence of GOBlayer. PSPARE 14 stores extension information.

In FIG. 3, (a) to (c) explain the range of the display screen displayed on a normal monitor screen, and show the relationship between the actual full screen and the area displayed on the television monitor. This indicates that there is a difference between them. When displaying a video signal on a television monitor, if it is desired to match the image signal included in the video signal without shifting the entire display area of the television monitor, it is necessary to perform strict individual adjustment for each monitor, or Even if the adjustment is performed, the displayed area may be shifted depending on the surrounding environment. Therefore, a generally used television monitor displays an area smaller than the area of the image that the video signal actually has, so that even if the display position is slightly shifted, an area such as a synchronization signal outside the image area cannot be seen. Has been adjusted as follows. Since the television monitor has such characteristics, when each of the display screens (a) to (c) is divided into four screens and displayed, the display is slightly shifted from the original screen.

Therefore, the present invention is intended to display the image data substantially at the center of each display screen by shifting the display screen divided into four at the substantially center. Here, (e) is a view for explaining an embodiment in which each display screen of (d) is shifted to the center and displayed, and is divided into four by shifting in the direction shown in (f). Since the displayed image data of each display unit is displayed in the center of the screen, a smooth conversation with the caller of the partner terminal can be realized.

[0009]

As described above, according to the present invention, in a multipoint communication system in which simultaneous communication is performed among four terminals, one terminal screen is divided into four parts, and the four divided display contents are respectively displayed at the center of the terminal screen. To realize a smooth conversation with the other party's caller

[Brief description of the drawings]

FIG. 1 is a block diagram of a multipoint communication system according to the present invention.

FIG. 2 is a diagram illustrating a communication format used in the multipoint communication system of the present invention.

FIG. 3 is a diagram illustrating a display position of a monitor screen used in the multipoint communication system of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ISDN network 2 Line I / F 3 Demultiplexing 4 PSC detection part 5 Buffer 6 Control part 7 Decoder 8 Encoder 9 DRAM

Claims (1)

[Claims] An image data communication is performed between a plurality of communication terminals via a communication line, and a display screen of the communication terminal is divided into four parts, and a communication screen of up to four of the plurality of communication terminals simultaneously communicating is formed. In a multi-point communication system capable of simultaneously displaying images related to a terminal on one terminal screen, the multi-point communication system displays the four divided display contents toward a center of the terminal screen. .