JPH02192380A - Picture display device - Google Patents

Abstract

PURPOSE:To make plotting information easy to see and to simultaneously make the picture of a video signal also into a visually recognizable state by compressing the picture based on the video signal and displaying the compressed picture when the expression of the other party is desired to see in the case of projecting the plotting information. CONSTITUTION:When a person key 16X of a keyboard 16 is operated and turned on, a key input/output control circuit 22 switches and connects changeover switches 31-33 to the side of a terminal (a) to be selected and switches and connects a changeover switch 35 to the side of a terminal (b) to be selected. At this time, the video signal from a person camera 12 is respectively sent to a color demodulation circuit 37 and a CODEC 17. Further, the video signal of the other party from the CODEC 17 is sent to a color demodulation circuit 34, demodulated, and sent to a monitor 11. Consequently, the video signal from the other party is projected on a main screen M of the monitor 11, a self-picture image-picked up by the camera 12 is projected as a sub screen S, namely, a part of the screen, and this self-picture is sent and projected on the main screen of the monitor of the other party.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image display device, and more particularly, to an image display device that displays drawing information obtained by a drawing input means such as a tablet on a monitor.

[Summary of the invention]

The present invention provides an image display device connected to a drawing input means such as a tablet, which has two modes: a first mode in which drawing information obtained by the drawing input means is superimposed on a video signal and displayed on a monitor; The configuration is configured such that a second mode in which the image is displayed on the monitor and a third mode in which the image based on the video signal is compressed and displayed on a part of the screen where drawing information is displayed can be alternatively selected. This eliminates the unsightly appearance caused by overlapping images when displaying drawing information, and also allows images based on video signals to be viewed at the same time.

(Prior Art) For example, an image display device for use in a videophone device is considered to be equipped with a drawing function. A television camera (person camera) for taking images is arranged, and a television camera (document camera) for capturing documents and images is provided near the monitor, and furthermore, as an option, a drawing input means such as a liquid crystal drawing tablet is provided. The monitor can be connected to a controller for display image control and transmission/reception control, and the controller is equipped with a codec (Korg).
decoder) to a digital telephone line, etc. Here, the drawing input means such as the tablet is connected to the controller, and the tablet or the like is used to draw underlines, checkmarks, etc. at necessary locations on the document image taken by the document camera. It is possible to draw, and draw simple shapes and memos directly with the child. In this case, the drawing information is
This data signal is taken as a data signal different from the video signal captured by the portrait camera or document camera.

[Problem 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 above-mentioned drawing information on the image of the calligraphy and painting and display it on the monitor, but when the drawing information is superimposed on the image of the person, the screen becomes unsightly. Furthermore, even when drawing information is superimposed on the calligraphy image, the background calligraphy image may become an eyesore when newly drawing a handwritten memo, figure, or the like.

Therefore, one possible display mode for drawing information is to display only the drawing information by setting the background to a single color such as black, but in this case, it becomes impossible to see the entire content of the video signal, and the other party's facial expression etc., and the advantages of videophone calls are halved.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an image display device that eliminates the unsightly appearance when displaying drawing information on a monitor and also allows the content of a video signal to be confirmed at the same time. purpose.

(Means for Solving the Problems) In order to solve the above-mentioned problems, an image display device according to the present invention is an image display device that supplies at least a video signal to a monitor and displays the image. A first mode in which the generated drawing information is superimposed on the video signal and supplied to the monitor, a second mode in which only the drawing information is displayed on the monitor, and a screen in which the drawing information is displayed. The present invention is characterized in that it is configured such that a third mode in which an image based on the video signal is compressed and displayed can be selectively selected.

[For production]

When drawing markings, etc. on images of calligraphy, etc., select the first mode and superimpose drawing information on the video signal, and when drawing handwritten notes, figures, etc., select the second mode. If you want to display only the drawing information on the monitor and also see the other person's facial expressions when displaying the drawing information, select the third mode and display the compressed image based on the video signal. To make information easy to view and to simultaneously make an image of a video signal visible.

〔Example〕

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 video telephone device.

In the video telephone device shown in FIG. 1, a television camera (person camera) 12 for photographing a person is disposed in the upper center of a display screen 11a of a monitor 11 such as a CRT display. A television camera (document camera) 13 for capturing document images is supported and fixed via a support arm 13a attached to the upper surface of the body. A document placement stand 13b is provided facing the document camera 13, and the camera 13 images the document placed on the document ia placement table 13b. Note that the person camera 12 is for capturing an image of a person (talker) facing the monitor 11.

The monitor 11 has the video signal output terminal 2 of the controller 20.
A video signal from 0a is supplied, and each image output signal from the person camera 12 and document camera 13 is sent to the controller 20.
are sent to signal input terminals 20b and 20c, respectively. The drawing tablet 15, which is a drawing input means, is connected to the tablet input/output control circuit 21 via the drawing information input/output terminal 2nd of the controller 20, and the keyboard 16, which is a key input means, is connected to the tablet input/output control circuit 21 through the keyboard connection terminal 20e of the controller 20. It is connected to the output control circuit 22. The keyboard 16 includes at least a sub-screen key 16W.
1 person key 16X, drawing key 16Y and blackboard key 162
A mode switching key is provided.

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 also sent to the data transmission circuit 2.
4 to the codec 17. 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 this drawing information and the tablet input/output control circuit 21
The image data is mixed with the drawing information from the computer and sent to the video RAM 26, which is a video storage means.

Signals for displaying drawing information (for example, R, G, and B primary color signals) from the video RAM 26 are sent to one selected terminal of a high-speed changeover switch 27 for so-called superimpose. The changeover switch 27 is controlled by a changeover control signal from the video RAM 26, for example.

This switching control signal can be obtained by summing and waveform-shaping the respective primary color signals of R, G, and B, which are the display signals of the above-mentioned drawing information. When it is non-zero, the switching control signal becomes, for example, H'' (high level), and the changeover switch 27 is connected to the selected terminal a. Alternatively, a video signal is supplied in which another reduced screen (sub-screen) is inserted into the calligraphy screen (main screen) as necessary.This video signal includes, for example, each primary color signal of R and GSB. So, so...
Normally, this video signal passes through the changeover switch 27 and is sent to the monitor 11 via the video signal output terminal 20a, whereas in the portion where the drawing information is present (non-zero), the drawing information read out from the video RAM 26 is The information display signal passes through the changeover switch 27 and is sent to the monitor 11 via the terminal 20a.
sent to. As a result, the drawing content is displayed (superimposed) on the image of the video signal.

Next, the video signal supplied from the portrait camera 12 via the input terminal 20b is supplied to the selected terminal a of the changeover switch 31, the selected terminal a of the changeover switch 32, and the selected terminal C of the changeover switch 33, respectively. has been done. The video signal supplied from the document camera 13 via the input terminal 2Qc is supplied to the selected terminal of the changeover switch 32 and the selected terminal of the changeover switch 33, respectively.

Selected terminal of selector switch 31 and selector switch 33
The codec (Korg decoder) is connected to the selected terminal a of
Video signals from the other end from 17 are supplied respectively,
The video signal from the changeover switch 32 is sent to the codec 17. The video signal from the changeover switch 33 is sent to the color demodulation circuit 34 and is color demodulated.
The C and B primary color signals are sent to the selected terminal of the selector switch 35. A black screen signal from a black screen signal generation circuit 36 is supplied to the selected terminal a of the changeover switch 35. This black screen signal is used to display a background (blackboard) in a blackboard mode, which will be described later. The video signal from the changeover switch 35 is supplied to a selected terminal of the changeover switch 39. The video signal from the changeover switch 31 is sent to a color demodulation circuit 37 where it is color demodulated, turned into a signal for displaying a reduced screen by an image compression processing circuit 38, and sent to the selected ta terminal a of the changeover switch 39.

This changeover switch 39 outputs a video signal in a so-called picture-in-picture display format, in which the video signal from the selected terminal a is inserted into the video signal supplied to the selected terminal A. As shown in FIG. 2, a reduced screen (sub-screen) S from the image compression processing circuit 38 is fitted into a part of the screen (main screen) M on which the video signal from the changeover switch 35 is displayed. A video signal for displaying an 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, and after the drawing information from the selected terminal is superimposed as necessary, the video signal output terminal 20a is sent to the selected terminal a. It is sent to the monitor 11 via the Here, the changeover switches 31, 32, 33, 35 and 39 are controlled by respective changeover control signals from the key person output control circuit 22, respectively.

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

Here, as for the image compression processing circuit 38, as shown in FIG. 3, for example, a luminance signal (Y) from the color demodulation circuit 37 and two color difference signals (R-Y) are generated.

B-Y) are sent to compression circuits 4142 and 43, respectively,
A configuration is often used in which the image is compressed by performing thinning processing in the horizontal and vertical directions, and is sent to the matrix circuit 44 and converted into RSG and B primary color signals.

In the videophone device having such a configuration, when the person key 16X of the keyboard 16 is turned on, the key person output control circuit 22 switches and connects the changeover switches 31 to 33 to the selected terminal a side, and the changeover switch 35 Switch and connect the terminal to the selected terminal. At this time, the person camera 1
The video signal from 2 is sent to the color demodulation circuit 37 via the changeover switch 31 and to the codec 17 via the changeover switch 32, respectively. Further, the video signal of the other party from the codec 17 is sent to the color demodulation circuit 34 via the changeover switch 33, demodulated, and sent to the monitor 11 via the changeover switch 35 and further through the changeover switch 27. Therefore, on the monitor 11, a video signal from the other party is displayed on the main screen M in FIG.
is displayed as a sub-screen S that is part of the screen, and an image of the self-portrait person is sent out and displayed on (the main screen of) the other party's monitor.

Next, when the drawing key 16Y of the keyboard 16 is turned on, the key output control circuit 22 switches between the changeover switches 31 and 3.
3 are switched and connected to the selected terminal. As a result, 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 sent to the codec 17 via the changeover switch 32 and the changeover switch 33. and sent to the color demodulation circuit 34, respectively. Therefore, an image (document) captured by the document camera 13 is displayed on the monitor 11 and the monitor of the other party, and an image of the other party is displayed on the sub-screen of the monitor II.

For reference, when the destination device switches to the drawing mode, for example, the changeover switches 31 to 33 are all switched to the selected terminal a side, and the main screen of the monitor 11 is displayed from the destination device. An image (calligraphy or drawing) of the person is displayed, and a self-portrait image of the person is displayed on the sub-screen and the other party's monitor (sub-screen). Note that an image of the caller's drawings is displayed on the main screen of the receiver's monitor.

When these human or calligraphy projection modes are selected, if drawing information is entered manually using the tablet 15, the drawing information is transmitted 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 to the video RAM 26, and this is superimposed on the video signal by the changeover switch 27. It is sent to the monitor 11.

Therefore, markings such as underlines, checkmarks, etc. can be applied over the displayed calligraphy or drawings, for example.

Here, if the video signal is a signal obtained by capturing an image of a person, or if only a handwritten memo or the like is desired to be displayed separately from the calligraphy or drawings, the blackboard key 162 of the keyboard 16 is turned on. That is, when the blackboard key 16Z is turned on to select the blackboard mode, the key person output control circuit 22 turns on the changeover switch 35.
is connected to the selected terminal a side, and the black screen signal generation circuit 3
The black screen signal from 6 is sent to the selected terminal a of the changeover switch 27 instead of the video signal. Further, the key person output control circuit 22 controls the changeover switch 39 to be connected to the selected terminal at all times, and stops displaying the sub-screen.

Therefore, the display format corresponds to a blackboard with a solid black background, and only the drawing information is displayed on the monitor 11.

The background color in this case is not limited to black, and any color that can be distinguished from the 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 output control circuit 22 switches and connects the selector switch 31 to the selected terminal a side, and also switches The switch 39 is caused to perform a switching control operation so that the sub-screen is displayed in the picture-in-picture display format, and the video signal from the other party is displayed on a part of the main screen on which the blackboard of the monitor 11 is displayed. Compress and display images 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 top of the image,
For example, you can not only draw underlines, checkmarks, etc. on the image of a calligraphy or painting displayed on the monitor 11, but also use the blackboard key 162 of the keyboard 16 when you want to display only handwritten memos, etc. By turning it on, the background becomes a single color such as black, which corresponds to a blackboard, and only the drawn content can be clearly seen. Furthermore, when the blackboard mode is selected and only drawing information is displayed, by turning on the sub-screen key 16W and selecting the sub-screen mode, the image of the other party, etc. can be compressed into a part of the screen. This allows you to explain the drawing while looking at the other person's facial expressions.

In addition, in the above embodiment, a specific example was explained in which the sub-screen key 16W is effective only in the blackboard mode.
Of course, it is also possible to configure the sub-screen so that it can be switched between the display state and the erased state by operating the sub-screen key on and off while the person display mode or the document display mode is selected. . Further, in an actual videophone device, a still image mode selection key may be provided in addition to this, and when the still image mode is selected, high resolution still image information of a person or a document may be sent.

〔Effect of the invention〕

According to the image display device of the present invention, when drawing an underline, a checkmark, etc. on an image of a calligraphy or painting, the first mode is selected and the drawing information is superimposed on the image signal, and the drawing information is superimposed on the image signal, such as a handwritten memo or figure. When drawing, select the second mode to display only the drawing information on the monitor, and if you want to see the other person's image while displaying the drawing information, select the third mode to display the drawing information on the screen. By compressing and displaying an image that is partially based on a video signal, it is possible to display an image that is easy to see according to the drawing content, and it is also possible to see the other party's facial expressions even while the drawing information is being displayed.

[Brief explanation of the drawing]

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 video telephone device, Fig. 2 is a schematic diagram showing a main screen and a sub-screen, and Fig. 3 is an image compression processing circuit. FIG. 2 is a block circuit diagram showing an example of a single console. 11...Monitor 12...Portrait camera 13...Document camera 15...Tablet (drawing input means) 16...
... Keyboard 16W ... Subscreen key 16X ... Person key 16Y ... Calligraphy key 162 ... Blackboard key 17 ... Codec 18...Modem 20...-Controller 21...Tablet input/output control a1 circuit 22...
... Key person output control circuit 23 ... Drawing information control circuit 27.31.32.33.35.39 ... Changeover switch 36 ... Black screen signal generation Circuit 38... Image compression processing circuit

Claims (1)

[Scope of Claims] In an image display device that supplies at least a video signal to a monitor for display, a first mode in which drawing information generated by a drawing input means is superimposed on the video signal and is supplied to the monitor; , a second mode in which only the drawing information is displayed on the monitor, and a third mode in which a compressed image based on the video signal is displayed on a part of the screen where the drawing information is displayed. An image display device characterized in that the image display device is configured to be selectively selectable.