NZ526137A

NZ526137A - Video terminal, video terminal communication system, and video conferencing system

Info

Publication number: NZ526137A
Application number: NZ526137A
Authority: NZ
Inventors: Satoru Sudo
Original assignee: Ginganet Corp
Priority date: 2000-12-01
Filing date: 2000-12-01
Publication date: 2004-07-30

Abstract

A video terminal capable of displaying a subscreen within a main screen, comprises means for optimizing a screen layout of the main screen and the subscreen, depending on the types of images to be displayed on the main screen and the subscreen, wherein the main screen is in a split composite screen mode, the optimizing means allows the subscreen to occupy one section of the split composite screen; and when the main screen is in a full screen mode, the optimizing means allows the subscreen to be diminished.

Description

<div class="application article clearfix" id="description"> 526137 VIDEO TERMINAL, VIDEO TERMINAL COMMUNICATION SYSTEM, AND VIDEO CONFERENCING SYSTEM FIELD OF THE INVENTION 5 The present invention relates to a video terminal such as a videophone terminal and a video conferencing terminal. In more detail, the invention relates to a video terminal which is capable of displaying a sub-screen within a main screen, and a video terminal 10 communication, system and a video conferencing system using such video terminals. BACKGROUND ART Conventionally, there has been a video terminal 15 which is capable of displaying a subscreen (e.g. a 1/9-size subscreen) within a main screen, with the subscreen being arranged to display animations. In this conventional video terminal, users can select what to display on the main screen and the subscreen and where 2 0 to place the subscreen on the display (specifically, wherever of four areas: top left, bottom left, top right, and bottom right) at their ..will. However, no existing system permits automatic selection and switchover of screen layouts of the main 25 screen and the subscreen. 2 With respect to the video conferencing system, one type of system has been recently gaining popularity, namely, a system which utilizes a multipoint control unit for connecting multiple video terminals via 5 communication lines. The multipoint control unit (MCU) used in this video conferencing system has a continuous presence function. Where video terminals at four locations are connected together, the screen of each terminal is divided into four sections and 10 displays images from all terminals. While this video terminal displays a four-split composite screen, each section may further contain a subscreen, for example, in 1/9 scale. In this situation, however, the screen layout is so complicated 15 as to spoil the total balance. Besides, when each section of the four-split composite screen includes a 1/9-size subscreen, the view of each section itself is seriously impaired. Further, as far as this four-split composite screen is concerned, one of the four sections 20 contains a subscreen of the identical image (provided that the image is an animation) . This is an inefficient screen layout. The present invention is made either to solve these problems, or at least provide the public with a useful choice. An object of the invention is to provide a video terminal, a video terminal 25 ,'r-Z^j.SL. 112.75 ... 'j W... .. « .T* ;INTELLECTUAL PROf-eFiTY | ;OFPiCP OF HZ I ;3 0 APR 203*1 3 10 communication system, and a video conferencing system, wherein the screen layout of the main screen and the subscreen is automatically changed and optimized through selection of the types of images to be displayed on the main screen and the subscreen, or wherein the public is provided with a useful choice. SUMMARY OF THE INVENTION In one aspect, the invention concerns a video terminal capable of displaying a subscreen within a main screen, wherein the video terminal comprises means for optimizing a screen layout of the main screen and the subscreen, depending on the types of images to be displayed on the main screen and the subscreen. 15 With respect to the above arrangement, the video terminal of the invention is characterized in that when the subscreen displays a still image, the optimizing means allows the subscreen to be enlarged. Also with respect to the above arrangement, the video terminal 20 of the invention is characterized in that when the main screen is in a split composite screen mode, the optimizing means allows the subscreen to occupy one section of the split composite screen. Besides, when the main screen is in a full screen mode, the optimizing 25 means allows the subscreen to be diminished. r. -fft i/iPROPERfY - n{£:r> of M.Z 3 o APR a® received 4 The invention also concerns a video conferencing system which is characterized in comprising multiple video terminals of the above arrangements, and a multipoint control unit which connects these video 5 terminals together via communication lines. This video conferencing system is also characterized in that each of the video terminals selects the type of image to be displayed on the main screen, and that the multipoint control unit determines a display position 10 of the ' subscreen, depending on the selected type of image to be displayed on the main screen. The invention further concerns a video terminal communication system which is characterized in comprising video terminals of each of the above 15 arrangements, with a point-to-point connection being established between the video terminals via a communication line. This video terminal communication system is also characterized in that each of the video terminals comprises: transmission means for 20 transmitting a display mode specification command to the other video terminal via the communication line, with a screen layout of the main screen and the subscreen being optimized by the optimizing means and specified by the display mode specification command; receiving 25 means for receiving a display mode specification 5 command which is transmitted from the other video terminal via the communication line; and switching means for switching screen layouts in accordance with the display mode specification command which is re-5 ceived by the receiving means. The invention again concerns a video conferencing system which is characterized in comprising multiple video terminals of the above arrangements, and a multipoint control unit which connects these video 10 terminals together via communication lines. This video conferencing system is also characterized in that each of the video' terminals comprises: transmission means for transmitting display mode specification commands to the multipoint control unit via one of the 15 communication lines, with a screen layout of the main screen and the subscreen being optimized by the optimizing means and specified by the display mode specification commands; receiving means for receiving a display mode specification command which is 20 transmitted from the multipoint control unit via the one communication line; and switching means for switching screen layouts in accordance with the display mode specification command which is received by the receiving means. This video conferencing system is 25 further characterized in that the multipoint control 6 unit comprises relay means for receiving the display mode specification commands from each video terminal and transmitting them to the other video terminals. The video terminal of the invention, capable of 5 displaying a subscreen within a main screen, is arranged to comprise means for optimizing a screen layout of the main screen and the subscreen, depending on the types of images to be displayed on the main screen and the subscreen. As a result, it is possible to display 10 the main screen and. the subscreen in an optimum screen layout, simply by selecting the types of main screen and subscreen. When the subscreen displays a still image, the video terminal of the invention is arranged to enlarge 15 the subscreen. Accordingly, a still image such as text information can be always _ displayed on the screen in a clear view. . The video terminal of the invention is arranged to allow the subscreen to occupy one section of the split 20 composite screen. Besides, when the main screen is in a full screen mode, the video terminal is arranged to diminish the subscreen. Therefore, the subscreen can be always displayed in an optimum screen layout, depending on the type of main screen. 25 The video conferencing system of the invention 7 comprises multiple video terminals and a multipoint control unit which connects these video terminals together via communication lines. Each of the video terminals is arranged to select the type of image to 5 be displayed on the main screen, and the multipoint control unit is arranged to determine a display position of the subscreen, depending on the type of main screen image. As a result, the subscreen can be always displayed at an optimum position relative to the main 10 screen. The video terminal communication system of the invention comprises video terminals which establish a point-to-point connection via a communication line. Each of the video terminals is arranged to comprise: 15 transmission means for transmitting a display mode specification command to the other video terminal via the communication line, with a screen layout of the main screen and the subscreen being optimized by the optimizing means and specified by the display mode 20 specification command; receiving means for receiving a display mode specification command which is transmitted from the other video terminal via the communication line; and switching means for switching screen layouts in accordance with the display mode 25 specification command which is received by the 8 receiving means. Therefore, if the user of a terminal wishes to send data or the like to the user of the other terminal, the data can be displayed at the other terminal in an optimum screen layout, without any 5 manipulation by the user of the other terminal. Again, the video conferencing system of the invention comprises multiple video terminals, and a multipoint control unit which connects these video terminals together via communication lines. Each of 10 the video terminals is arranged to comprise: transmission means for transmitting display mode specification commands to the multipoint control unit via one of the communication lines, with a screen layout of the main screen and the subscreen being optimized 15 by the optimizing means and specified by the display mode specification commands; receiving means for receiving a display mode specification command which is transmitted from the multipoint control unit via the one communication line; and switching means for 20 switching screen layouts in accordance with the display mode specification command which is received by the receiving means. The multipoint control unit is arranged to comprise relay means for receiving the display mode specification commands from each video 25 terminal and transmitting them to the other video 9 terminals. Therefore, if the user of a terminal wishes to send data or the like for a meeting to the users of the other terminals, the data for a meeting can be displayed at the other terminals in an optimum screen 5 layout, without any manipulation by the users of the other terminals. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory view showing the overall 10 configuration of a video conferencing system which employs video terminals of the invention. Fig. 2 is a more specific block diagram showing the configuration of a video conferencing terminal. Fig. 3 is a flowchart which illustrates display mode switchover operations 15 at each video conferencing terminal employed in a video conferencing system. Fig. 4 is a flowchart which illustrates display mode switchover operations at each video conferencing terminal employed in a video conferencing system. 20 DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the invention are hereinafter described with reference to the drawings. Fig. 1 is an explanatory view showing the overall 25 configuration of a video conferencing system which 10 employs video terminals of the invention. This video conferencing system comprises multiple video terminals (hereinafter called "video conferencing terminals") la, lb. . .In, and a multipoint 5 control unit (MCU) 3 which connects the multiple video conferencing terminals la, lb...In via communication lines 2a, 2b...2n. As shown in Fig. 2, each of the video conferencing terminals la, lb. . .In is constituted with a television 10 11 which is used as a picture information display unit and an audio information output unit, a television camera 12 as a picture information acquisition unit, a microphone 13 as an audio information acquisition unit, a keyboard 14 as a text information input unit, 15 and a signal control unit 15 such as a multiplexer . The signal control unit 15 is interposed between and connected to these components and their corresponding communication 1ines 2a, 2b. . .2n, and controls input and output of signals across those components and their 20 communication lines 2a, 2b. . . 2n. To give another example, the video conferencing terminals la, lb...In may be personal computers each of which is composed of a display unit, a speaker, a camera, a microphone, a keyboard and an internal modem. 25 The communication line may be an ISDN (Integrated 11 Services Digital Network) line or a high-speed digital leased line, to name a few. In the video conferencing system of this arrangement, each of the video conferencing terminals la, lb. . . In can simultaneously display images from four locations including the own terminal, with a screen of the television 11 (hereinafter called "television screen") being split into four sections. In addition, the present embodiments enable a 1/9-size subscreen to appear within a main screen (a full screen or the whole of the four-split composite screen). The keyboard 14 is equipped with a selection key (not shown) for selecting the types of images to be displayed on the main screen and the subscreen. Also provided is switching means which automatically switches the screen layouts (display size and display position) of the main screen and the subscreen, based on the manipulation of the selection key. As the switching means, the present embodiments adopt the signal control unit 15. In the case of a personal computer, the switching means is realized by a system controller which controls the entire computer operations. Further, the switching means executes an operation according to a display mode switchover process program which is stored in an internal ROM (not_ nNT&^-CTUAL'"PROPERTY I OWCf OF N.Z I 3 0 APR im 12 shown) . Incidentally, the display modes for the main screen include a full screen view (where a single section occupies the entire screen) and a four-split view. The types of main screen include an incoming 5 animation and a still image, whereas the types of subscreen include an incoming animation, an outgoing animation and a still image. With regard to the video conferencing system of the above arrangement, each of the video conferencing 10 terminals la, lb... In performs display mode switchover operations, as detailed below with reference to the flowcharts in Fig. 3 and Fig. 4. The flowchart in Fig. 3 concerns the case where the main screen is in a four-split composite screen mode, whereas the flow-15 , chart in Fig. 4 concerns the case where the main screen is in a full screen mode. As mentioned already, the display modes for the main screen include a full screen view (where a single section occupies the entire screen) and a four-split 20 view. The types of main screen include an incoming animation and a still image, whereas the types of subscreen include an incoming animation, an outgoing animation and a still image. Under such circumstances in the present 25 embodiments, the combination of the main screen and the 13 subscreen (main screen/subscreen) is selectable from three types: (1) Incoming animation/Outgoing animation, (2) Still image/Incoming animation, and (3) Incoming animation/Still image. In addition, the full screen 5 mode and the four-split composite screen mode are available for an incoming animation or animations. To be specific, the MCU 3 adopts the full screen mode and the four-split composite screen mode, while the point-to-point connection between the video 10 conferencing terminals la, lb...In adopts the full screen mode. [1] When the main screen is in the four-split composite screen mode In this case, the selection key is manipulated 15 (SI) to show incoming animations on the main screen in the four-split composite screen mode and to show an outgoing animation on the subscreen (S2). Based on this selected combination, the display mode switching means allows an outgoing animation to be displayed on 20 a 1/4-size subscreen, at a section allotted to the own terminal (S3 to S4). At this stage, if the display is off in the section for the own terminal (Yes in S3) and also if the four-split composite screen has a blank section (Yes in S5), the outgoing animation is shown 25 on a 1/4-size subscreen at the blank section (S6) . If 14 there is no blank section (No in S5), the outgoing animation is forced to appear on a 1/4-size subscreen, at the bottom right part of the screen (S7) . In addition, if the locational information is unavailable, 5 the outgoing animation is forced to appear on a 1/4-size subscreen, at the bottom right part of the screen. In another case, suppose that the selection key is manipulated (SI) to show still images on the main screen and to select an incoming animation on the 10 subscreen (S2). Based on this selected combination, the display mode switching means forces an incoming animation to appear on a 1/4-size subscreen, at the bottom right part of the screen (S8). In yet another case, suppose that the selection 15 key is manipulated (SI) to show incoming animations on the main screen in the four-split composite screen mode and to show a still image on the subscreen (S2) . Based on this selected combination, the display mode switching means allows a still image to be displayed 20 on a 1/4-size subscreen, at a section allotted to the own terminal (S9 to S10) . At this stage, if the display is off in the section for the own terminal (Yes in S9) and also if the four-split composite screen has a blank section (Yes in Sll), the still image is shown on a 25 1/4-size subscreen at the blank section (S12) . If 15 there is no blank section (No in Sll), the still image is forced to appear on a 1/4-size subscreen, at the bottom right part of the screen (S13) . In addition, if the locational information is unavailable, the still 5 image is forced to appear on a 1/4-size subscreen, at the bottom right part of the screen. [2] When the main screen is in the full screen mode In this case, the selection key is manipulated 10 (S21) to show an incoming animation on the main screen in the full screen mode and to show an outgoing animation on the subscreen (S22) . Based on this selected combination, the display mode switching means allows an outgoing animation to appear on a 1/9-size subscreen, 15 at the bottom right part of the screen (S23) . In another case, suppose that the selection key is manipulated (S21) to show a still image on the main screen in the full screen mode and to show an incoming animation on the subscreen (S22) . Based on this se-20 lected combination, the display mode switching means allows an incoming animation to appear on a 1/9-size subscreen, at the bottom right part of the screen (S24) . In yet another case, suppose that the selection key is manipulated (S21) to show an incoming animation 25 on the main screen in the full screen mode and to show 16 a still image on the subscreen (S22). Based on this selected combination, the display mode switching means allows a still image to appear on a 1/4-size subscreen, at the bottom right part of the screen (S25). Concerning the above embodiments, the size of the subscreen is selected from 1/4 or 1/9. However, these sizes are merely given for the purpose of description and should not be construed to limit the subscreen size. Besides, the initial display position of the subscreen should not be limited to the bottom right part of the display. Further, the main screen may be split into any number of sections, instead of four. To put it simply, the greatest feature of the invention is to automatically optimize the screen layouts in the following manner. First, when the subscreen shows a still image, the subscreen is enlarged in size (1/4-size in the above-described operations) as compared with conventional subscreens, in order to ensure a clear view of the subscreen. Second, when the main screen is in the full screen mode, the subscreen is diminished in size (1/9-size in the above-described operations) so as not to obstruct the main screen. Regarding the display mode switching process by the switching means, the display size and display position as mentioned above should be understood to 17 20 refer to the initial size and position in response to the manipulation of the selection key. Later, a user can change the display size and display position at his/her will by manipulating the keyboard 14 or the like, as in the conventional cases. As far as the above-described operations are concerned, the selections are effected at the own terminal alone. However, considering the use of the video conferencing terminals la, lb . . . In in the video conferencing system, it is convenient if the main screen/subscreen combination can be selected at the own terminal and then can be automatically set to the other terminals connected by the MCU 3. From this point of view, the present invention is arranged to transmit display mode specification commands which specify a main screen/subscreen combination selected at the own terminal, from the own terminal to the other terminals via their communication lines 2a, 2b...2n and the MCU 13. On receiving the display mode specification commands, the other terminals execute the above operations (the operations shown in Fig. 3 and Fig. 4), according to the main screen/subscreen combination specified by the display mode specification commands. Eventually, each of the other terminals selectively displays the main screen and the subscreen, just as the PROFERTY OFRO: OF N.z 3 0 APR 2004 18 selection is made by the keyboards 14 of its own terminal . In order to enable transmission and receipt of the display mode specification commands across the terminals, the MCU 13 additionally needs to have relay means for relaying the display mode specification commands. This arrangement corresponds to claim 6. Moreover, where any two video conferencing terminals establish a point-to-point connection via a communication line without interposition of the MCU 13, a display mode specification command can be sent and received as well. This arrangement corresponds to claim 5. INDUSTRIAL APPLICABILITY As described above, the video terminal, the video terminal communication system and the video conferencing system concerning the present invention are suitable for use in a video conference. </div>

Claims

<div class="application article clearfix printTableText" id="claims"> 19 WHAT WE CLAIM IS:

1. A video terminal capable of displaying a subscreen within a main screen, wherein the video terminal comprises means for optimizing a screen layout of the main screen and the subscreen, depending on the types of images to be displayed on the main screen and the subscreen.

2. A video terminal according to claim 1, wherein when the subscreen displays a still image, the optimizing means allows the subscreen to be enlarged.

3. A video terminal according to claim 1, wherein: when the main screen is in a split composite screen mode, the optimizing means allows the subscreen to occupy one section of the split composite screen; and when the main screen is in a full screen mode, the optimizing means allows the subscreen to be diminished.

4. A video conferencing system comprising multiple video terminals according to any of claims 1 to 3, and a multipoint control unit which connects these video terminals together via communication lines, wherein: each of the video terminals selects the type of image to be displayed on the main screen; and the multipoint control unit determines a display position of the subscreen, depending on the selected type of image to be displayed on the main screen.

5. A video terminal communication system comprising video terminals according to any of claims 1 to 3, with a point-to-point connection being established between the video terminals via a communication line, wherein each of the video terminals comprises: transmission means for transmitting a display mode specification command to the other video terminal via the communication line, with a screen layout of the main screen and the subscreen being optimized by the optimizing means and specified by the display mode specification command; 157331_1.DOC p— INTcLLECTUAL property" OFRCr OF N Z 3 0 APR 2004 20 receiving means for receiving a display mode specification command which is transmitted from the other video terminal via the communication line; and switching means for switching screen layouts in accordance with the display mode specification command received by the receiving means.

6. A video conferencing system comprising multiple video terminals according to any of claims 1 to 3, and a multipoint control unit which connects these video terminals together via communication lines, wherein each of the video terminals comprises: transmission means for transmitting display mode specification commands to the multipoint control unit via one of the communication lines, with a screen layout of the main screen and the subscreen being optimized by the optimizing means and specified by the display mode specification commands; receiving means for receiving a display mode specification command which is transmitted from the multipoint control unit via the one communication line; and switching means for switching screen layouts in accordance with the display mode specification command which is received by the receiving means; and that the multipoint control unit comprises relay means for receiving the display mode specification commands from each video terminal and transmitting them to the other video terminals.

7. A video terminal substantially as herein described with reference to the accompanying drawings. r..i.r By^nefeuthorised agents Afj.prn pW \V\ 157331_1.DOC 3 0 APR 2004 </div>