JP2863178B2 - Image display device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, and more particularly, to an image display device that displays drawing information obtained by drawing input means such as a tablet on a monitor.

[Summary of the Invention]

The present invention relates to an image display device to which a drawing input unit such as a tablet is connected, a first mode in which drawing information obtained by the drawing input unit is superimposed on a video signal and projected on a monitor, and only the drawing information is displayed. The second mode for displaying on a monitor and the third mode for compressing and displaying an image based on a video signal on a part of a screen on which drawing information is displayed can be selected. Thus, when displaying the drawing information, it is possible to eliminate the unsightlyness due to the overlapping of the images and to allow the image based on the video signal to be visually recognized at the same time.

[Conventional technology]

For example, an image display device to which a drawing function is added has been considered as an image display device used for a videophone device. In this videophone device, a television camera (portrait camera) for photographing a person is arranged at an upper front portion of a monitor display or the like for displaying images, and a television camera (document camera) for photographing a document is provided near the monitor. For example, a drawing input unit such as a liquid crystal drawing tablet can be connected and used as an option. The monitor is connected to a controller for controlling display images and controlling transmission and reception, and the controller includes a codec (coder / coder).
(Decoder) to a digital telephone line or the like. Here, the drawing input means such as the tablet or the like is connected to the controller. By using the tablet or the like, for example, an underline, a check mark, or the like is provided at a necessary portion of a document image captured by the document camera. It is possible to draw and draw simple figures and memos directly by hand. The drawing information in this case is
The data signal is handled as a data signal different from a video signal captured by the person camera or the document camera.

[Problems to be solved by the invention]

By the way, in such an image display device with a drawing function, it is necessary to superimpose the drawing information on the video of the document and project it on a monitor. Is hard to see. Further, even when the drawing information is superimposed on the picture of the document, the picture of the background picture may become obstructive when newly drawing a handwritten memo or graphic.

Therefore, as one of the display modes of the drawing information, it is conceivable that only the drawing information is projected with the background being a single color such as black. Cannot be read, and the advantage of a videophone is halved.

The present invention has been made in view of such circumstances, and provides an image display device that can eliminate the unsightlyness when projecting drawing information on a monitor and can simultaneously confirm the content of a video signal. Aim.

[Means for solving the problem]

In order to solve the above-described problems, an image display device according to the present invention has at least an image display device that supplies a video signal to a monitor and projects the image signal on a monitor for projection. Means, superimposing means for superimposing drawing information generated by the drawing input means on the video signal, and switching means for switching a display mode of an image displayed on the monitor, wherein the drawing information is displayed on the video signal. A first mode that is superimposed on a signal and supplied to the monitor, a second mode that displays only the drawing information on the monitor, and a part of a screen on which the drawing information is displayed is based on the video signal. A third mode for compressing and displaying an image can be alternatively selected, and the switching means can arbitrarily switch between the first mode, the second mode, and the third mode. To It is a symptom.

(Operation)

Select the first mode when drawing markings or the like on the image of a document, superimpose the drawing information on the video signal, and select the second mode when drawing handwritten memos or figures. When only the drawing information is displayed on the monitor, and when it is desired to see the expression of the other party at the time of displaying the drawing information, the third mode is selected and the image based on the video signal is compressed and displayed. The information can be easily viewed, and the image of the video signal can be visually recognized simultaneously.

〔Example〕

FIG. 1 is a block circuit diagram showing an embodiment in which the image display device according to the present invention is applied to a videophone device.

In the videophone device shown in FIG. 1, a television camera (person camera) 12 for photographing a person is provided at the upper center of a display screen 11a of a monitor 11 such as a CRT display. A television camera (document camera) 13 for photographing a document is supported and fixed via a support arm 13a attached to the upper surface of the body or the like. A document table 13b is provided opposite to the document camera 13, and the camera 13 captures an image of a document placed on the document table 13b. The person camera 12 is for capturing an image of a person (sender) facing the monitor 11.

The monitor 11 has a video signal output terminal 20a of the controller 20.
And the imaging output signals from the human camera 12 and the document camera 13 are sent to the signal input terminals 20b and 20c of the controller 20, respectively. The drawing tablet 15 serving as drawing input means is connected to a tablet input / output control circuit 21 via a drawing information input / output terminal 20d of the controller 20, and the keyboard 16 serving as key input means is provided with a key input via a keyboard connection terminal 20e of the controller 20. It is connected to the output control circuit 22. The keyboard 16 is provided with at least mode switching keys of a sub-screen key 16W, a person key 16X, a writing key 16Y, and a blackboard key 16Z.

The drawing information obtained from the tablet input / output control circuit 21 in response to drawing using the tablet 15 is sent to the drawing information control circuit 23 and to the codec 17 via the data transmission circuit 24. The drawing information control circuit 23 is supplied with drawing information from the other party obtained from the codec 17 via the data receiving circuit 25, and the drawing information from the other party and the drawing information from the tablet input / output control circuit 21 are supplied to the drawing information control circuit 23. To mix video
Sent to RAM26. Signals for displaying drawing information (for example, R, G, B primary color signals) from the video RAM 26 are sent to one selected terminal b of a so-called superimpose high-speed changeover switch 27. The switching switch 27 is controlled by a switching control signal from the video RAM 26, for example. This switching control signal can be obtained by taking the sum of, for example, R, G, and B primary color signals that are display signals of the drawing information and shaping the waveform,
When any one of the R, G, and B signals is non-zero, the switching control signal becomes, for example, "H" (high level), and the switch 27 is switched to the selected terminal b.
The selected terminal a of the changeover switch 27 is supplied with a video signal in which another reduced screen (sub-screen) is inserted as needed into a screen of a person or a picture (main screen) as described later. ing. The video signals are, for example, R, G, and B primary color signals.
27, is sent to the monitor 11 via the video signal output terminal 20a. On the other hand, in a portion where the drawing information exists (non-zero), the display signal of the drawing information read from the video RAM 26 is changed over by the changeover switch 27. To the monitor 11 via the terminal 20a. As a result, the drawing content is superimposed (superimposed) on the image of the video signal.

Next, the video signal supplied from the person camera 12 via the input terminal 20b is the selected terminal a of the changeover switch 31,
It is supplied to the selected terminal a of the changeover switch 32 and the selected terminal c of the changeover switch 33, respectively. The above document camera
The video signal supplied from 13 via the input terminal 20c is supplied to the selected terminal b of the changeover switch 32 and the selected terminal b of the changeover switch 33, respectively. The selected terminal b of the changeover switch 31 and the selected terminal a of the changeover switch 33 include:
A video signal from a destination is supplied from a codec (coder / decoder) 17, and a video signal from a changeover switch 32 is sent to the codec 17. Selector switch 33
Are sent to a color demodulation circuit 34 where they are color-demodulated, and become, for example, R, G and B primary color signals, which are sent to a selected terminal b of a changeover switch 35. A black screen signal from a black screen signal generation circuit 36 is supplied to a selected terminal a of the changeover switch 35. This black screen signal is used to project the background (blackboard) in the blackboard mode described later. The video signal from the changeover switch 35 is a changeover switch
It is supplied to 39 selected terminals b. The video signal from the changeover switch 31 is sent to a color demodulation circuit 37 to be color-demodulated, and is sent to a selected terminal a of the changeover switch 39 as a signal for displaying a reduced screen in an image compression processing circuit 38. The changeover switch 39 outputs a video signal in a so-called picture-in-picture display mode in which the video signal from the selected terminal a is fitted into the video signal supplied to the selected terminal b. As shown in FIG. 2, a screen (main screen) M on which the video signal from the changeover switch 35 is displayed.
A video signal for displaying an image in which the reduced screen (sub-screen) S from the image compression processing circuit 38 is fitted into a part of the image is output from the changeover switch 39. The video signal from the changeover switch 39 is sent to the selected terminal a of the changeover switch 27,
If necessary, the drawing information from the selected terminal b is superimposed and then sent to the monitor 11 via the video signal output terminal 20a. Here, the changeover switches 31, 32,
The switches 33, 35, and 39 are controlled to be switched by respective switching control signals from the key input / output control circuit 22.

The codec 17 is connected to a line 19 such as a digital telephone line via a modem (modulator / demodulator) 18.

Here, regarding the image compression circuit 38, for example, as shown in FIG. 3, the luminance signal (Y) from the color demodulation circuit 37 is output.
And two color difference signals (RY, BY) are sent to compression circuits 41, 42, and 43, respectively, and are subjected to thinning processing in the horizontal and vertical directions to perform image compression. , G, and B primary color signals are often used.

In the videophone device having such a configuration, when the person key 16X of the keyboard 16 is turned on, the key input / output control circuit 22 switches and connects all the changeover switches 31 to 33 to the selected terminal a side, and the changeover switch 35 Is the selected terminal b
Switch connection. At this time, the video signal from the human camera 12 is sent to the color demodulation circuit 37 via the changeover switch 31.
The data is sent to the codec 17 via the changeover switch 32. The other party's video signal from the codec 17 is sent to the color demodulation circuit 34 via the changeover switch 33 to be demodulated, and is sent to the monitor 11 via the changeover switch 35 and further via the changeover switch 27. Accordingly, on the monitor 11, a video signal from the other party is displayed on the main screen M in FIG. 2, and a video image taken by the human camera 12 (an image of the sender, a self-portrait image) is displayed on the screen. Is displayed as a part of the sub-screen S, and the image of the self-portrait person is transmitted and displayed on (the main screen of) the other party's monitor.

Next, when the writing key 16Y of the keyboard 16 is turned on, the key input / output control circuit 22 switches and connects all the changeover switches 31 to 33 to the selected terminal b side. by this,
The video signal from the other party is sent to the color demodulation circuit 37 via the changeover switch 31, and the video signal from the document camera 13 is color demodulated via the changeover switch 32 to the codec 17 and the changeover switch 33. Each is sent to the circuit 34. Accordingly, an image (document) captured by the document camera 13 is displayed on the monitor 11 and the monitor of the other party, and a person image of the other party is displayed on the sub-screen of the monitor 11.

For reference, when the document mode is switched to the above-mentioned document mode by the partner device, for example, all of the changeover switches 31 to 33 are switched and connected to the selected terminal a side, and the monitor is switched.
Video (calligraphy) from the other party is projected on the main screen of 11,
A self-portrait image is projected on the sub-screen and the monitor of the destination (sub-screen thereof). It should be noted that an image of the document of the other party is displayed on the main screen of the other party monitor.

If the drawing information is input using the tablet 15 while the projection mode of the person or the document is selected, the drawing is input from the tablet input / output control circuit 21 to the codec 17 via the data transmission circuit 24. The information (data signal) is sent, mixed with the drawing information from the other party in the drawing information control circuit 23, and written into the video RAM 26. This is superimposed (superimposed) on the video signal by the changeover switch 27. It is sent to the monitor 11. Therefore, for example, marking such that an underline, a check mark, or the like is drawn over the projected document can be given.

Here, when the video signal is a signal obtained by capturing a person, or when it is desired to display only a handwritten memo or the like separately from a document, the blackboard key 16Z of the keyboard 16 is turned on. That is, when the blackboard mode is selected by turning on the blackboard key 16Z, the key input / output control circuit 22 switches and connects the changeover switch 35 to the selected terminal a side, and outputs the black screen signal from the black screen signal generation circuit 36 as described above. The signal is sent to the selected terminal a of the changeover switch 27 instead of the video signal. Further, the key input / output control circuit 22 controls the changeover switch 39 to be always connected to the selected terminal b side, and stops the display of the sub-screen. Therefore, the display mode is equivalent to a blackboard with a black background, and only the drawing information is projected on the monitor 11. In this case, the background color is not limited to black, and any color that can be distinguished from drawing information can be selected.

When the sub-screen key 16W is turned on and the sub-screen mode is selected during such blackboard mode selection, the key input / output control circuit 22 switches and connects the changeover switch 31 to the selected terminal a side. The switch 39 is caused to perform a switching control operation such that the sub-screen of the picture-in-picture display mode is displayed, and a video signal from the other party is displayed on a part of the main screen displayed on the blackboard of the monitor 11. Compress and display the image based on.

According to such a videophone device, while the person display mode or the document display mode is selected, the tablet 15
The information input by drawing is overwritten on the video,
For example, when not only an underline or a check mark can be drawn on the image of a document projected on the monitor 11, but also when only a handwritten memo or the like is to be projected,
By turning on the blackboard key 16Z of the keyboard 16, the background becomes a single color such as black corresponding to the blackboard, and only the drawing content can be clearly seen. Furthermore, when the blackboard mode is selected and only the drawing information is displayed, by turning on the sub-screen key 16W and selecting the sub-screen mode, the person image of the other party is compressed to a part of the screen. Can be displayed, and the explanation of the drawing can be advanced while looking at the expression of the other party.

In the above embodiment, the specific example in which the sub-screen key 16W is valid only in the blackboard mode has been described.
It goes without saying that the sub-screen may be switched between the display state and the erased state by operating the sub-screen key on / off while the person display mode or the document display mode is selected. . In an actual videophone device, for example, a still image mode selection key may be provided, and when this still image mode is selected, high-resolution still image information of a person or a document may be transmitted.

〔The invention's effect〕

According to the image display device of the present invention, drawing input means for drawing arbitrary characters, figures, and the like, superimposing means for superposing drawing information generated by the drawing input means on the video signal, and the monitor Switching means for switching the display mode of an image displayed on the document, and when drawing an underline or a check mark on a video of a document, select the first mode to superimpose the drawing information on the video signal. When drawing a handwritten memo or figure, the second mode is selected and only the drawing information is projected on the monitor. When the user wants to see the other person's image while displaying the drawing information, the third mode is selected. Select a mode to compress and display the image based on the video signal on a part of the screen,
The display form can be arbitrarily switched in such a manner as described above, so that an easy-to-view display according to the drawing content is possible, and the expression of the other party can be seen even while the drawing information is being displayed.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing an embodiment in which an image display device according to the present invention is applied to a videophone device, FIG. 2 is a schematic diagram showing a main screen and a sub-screen, and FIG. It is a block circuit diagram which shows one specific example. 11 Monitor 12 Person camera 13 Document camera 15 Tablet (drawing input means) 16 Keyboard 16W Subscreen key 16X Person key 16Y Document key 16Z Blackboard key 17 Codec 18 Modem 20 Controller 21 Tablet input / output control circuit 22 Key input / output control circuit 23 Drawing information control circuit 27, 31, 32, 33, 35, 39 Switch 36 … Black screen signal generation circuit 38 …… Image compression processing circuit

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Haruko Hattori 1-1-3 Uchisaiwai-cho, Chiyoda-ku, Tokyo Tokyo Electric Power Company (72) Inventor Hiroshige Kimura 1-1-3 Uchisaiwai-cho, Chiyoda-ku, Tokyo Tokyo Within the Electric Power Company (72) Inventor Goki Watanabe 1-3-1 Uchisaiwai-cho, Chiyoda-ku, Tokyo Inside the Tokyo Electric Power Company (72) Inventor Shoji Tomura 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Sony Inside (72) Inventor Hiroshi Sahara 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Naoto Miyajima 2-1-1-17, Osaki, Shinagawa-ku, Tokyo Inside Meidensha ( 72) Inventor Nao Fujii 5-11-5 Minami-Aoyama, Minato-ku, Tokyo Ascii Co., Ltd. (72) Inventor Jun Mishima 5-11-5 Minami-Aoyama, Minato-ku, Tokyo Co., Ltd. Ascii (58) Field surveyed (Int.Cl. ⁶ , DB name) H04N 7 / 10,7 / 14-7 / 173,7 / 20-7/22 G09G 5/00-5/40

Claims (1)

(57) [Claims] 1. An image display device for supplying at least a video signal to a monitor and projecting the image signal, comprising: a drawing input means for drawing an arbitrary character, a figure, etc., and drawing information generated by the drawing input means. A first mode comprising: superimposing means for superimposing on the video signal; and switching means for switching a display mode of an image displayed on the monitor; and a first mode for superimposing the drawing information on the video signal and supplying it to the monitor. A second mode in which only the drawing information is displayed on the monitor, and a third mode in which an image based on the video signal is compressed and displayed on a part of the screen on which the drawing information is displayed. An image display device which can be arbitrarily switched between the first mode, the second mode, and the third mode by the switching means.