JPH02192381A - Picture display device - Google Patents

Abstract

PURPOSE:To solve difficulty in seeing caused by the superimposition of video by composing the subject picture display device so that a mode to superimpose plotting information on a video signal and project the plotting information and the video signal on a monitor can be switched to a mode to project only the plotting information on the monitor. CONSTITUTION:When the plotting information is inputted by using a tablet 15 while a mode for projecting pictures and writings, etc., is selected, the plotting information is sent from a tablet input/output control circuit 21 to a CODEC 17. Further, the plotting information is mixed with the plotting information from the other party in a plotting information control circuit 32, written in a video RAM 26, superimposed on the video signal, and sent to a monitor 11. When a only a handwritten memorandum, etc., are to be projected separately from the pictures and writings as stated here, a blackboard key 16Z of a key board 16 is operated and turned on. Thereupon, a black screen signal from a black screen signal generating circuit 36 is sent to the monitor 11 instead of the video signal. Consequently, a display state having a background equivalent to a blackboard all in a black color is obtained, only the plotting information is plotted on the monitor 11, and display easy to see corresponding to the plotting contents can be obtained.

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 a first mode in which drawing information obtained by a drawing input means is superimposed on a video signal and displayed on a monitor in an image display device connected to an ri@ input means such as a tablet. By configuring the display to be able to switch between the first mode and the second mode in which only the drawing information is displayed on the monitor, it is possible to eliminate the unsightliness caused by overlapping images when reading the drawing information.

[Conventional technology]

For example, as an image display device used in a video telephone device, an image display device with a drawing function added is being considered. In this videophone device, a television camera for photographing people (person camera) is arranged at the upper front of a monitor display for displaying images, etc., and a television camera for photographing document images (document camera) is placed near the monitor. It is also possible to connect and use a drawing device such as a liquid crystal drawing tablet as an option. A controller for controlling display images and controlling transmission and reception is connected to the monitor, and the controller is connected to a digital telephone line or the like via a codec (Coorg decoder). 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. The drawing information in this case is handled 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.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an image display device that can easily eliminate the unsightly appearance when displaying drawing information on a monitor.

[Means to solve the problem]

In order to solve the above-mentioned problems, an image display device according to the present invention supplies at least a video signal to a monitor for display, in which drawing information generated by a drawing input means is input to the video signal. The present invention is characterized in that it is configured to be able to switch between a first mode in which the drawing information is superimposed and supplied to the monitor, and a second mode in which only the drawing information is displayed on the monitor.

[Operation] When drawing markings, etc. on images of calligraphy, etc., the first mode is selected and drawing information is superimposed on the video signal, and when drawing handwritten notes, figures, etc., the second mode is selected. By selecting and displaying only the drawing information on the monitor, it becomes possible to display an easy-to-read display according to the drawing content.

〔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 at the upper center of a display screen 11a of a monitor 11 such as a CRT display. A television camera (document camera) 13 is supported and fixed via a support arm 13a attached to the upper surface of the body. A document storage stand 13b is provided facing the document camera 13, and the camera 13 images the document placed on the document storage stand 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 pickup 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 20d 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 person key 16X,
Mode switching keys such as a calligraphy key 16Y and a blackboard key 162 are 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 superimposition. 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, for example, R and CSB, which are the display signals of the drawing information, and when any one of the R1GSB signals is non-zero. When the switching control signal becomes, for example, "H" (high level), the changeover switch 27 is switched to the selected terminal. The selection terminal a of the changeover switch 27 is supplied with a video signal of a person or a calligraphy or painting (for example, color-demodulated primary color signals of R, G, and B), which will be described later.
7 and is sent to the monitor 11 via the video signal output terminal 20a, whereas the display signal of the drawing information read out from the video RAM 26 is sent to the selector switch 27 in the portion where the drawing information exists (non-zero). and is sent to the monitor 11 via the terminal 20a. As a result, the drawn content is projected (superimposed) on the image of a person or calligraphy or painting.

Next, the video signal supplied from the person camera 12 through the input terminal 20b is supplied to the selected terminal a of the changeover switch 32. The video signal supplied from the document camera 13 through the input terminal 20c is transmitted to the changeover switch 3
2 and the selected terminal of the selector switch 33, respectively. A video signal from the other end of the codec (Korg decoder) 17 is supplied to the selected terminal a of the changeover switch 33, and the changeover switch 32
The video signal from is sent to the codec 17. The video signal from the changeover switch 33 is sent to a color demodulation circuit 34 where it is color demodulated, and is sent to the selected terminal of the changeover switch 35 as primary color signals of, for example, R, G, and B.

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 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 20 is sent to the selected terminal a of the changeover switch 27.
It is sent to the monitor 11 via a. Here, the changeover switches 32, 33 and 35 are controlled by respective changeover control signals from the key person output control circuit 22.

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

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 32 and 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 codec 17 via the changeover switch 32. Further, the video signal of the other party from the codec 17 is transmitted to the color demodulation circuit 3 via the changeover switch 33.
4, demodulated, and sent to the monitor 11 via the changeover switch 35 and further through the changeover switch 27. Therefore, a video signal from the other party is displayed on the display screen 11a of the monitor 11, and an image (person) captured by the person camera 12 is displayed on the other party's monitor.

When the document key 16Y of the keyboard 16 is turned on, the key output control circuit 22 connects the selector switches 32 and 33 to the selected terminal, and the video signal from the document camera 13 is transmitted through the selector switch 32. The signal is then sent to the codec 17 and to the color demodulation circuit 34 via the changeover switch 33. Therefore, the image (document image) captured by the document camera 13 is displayed on the monitor 11 and the monitor of the other party.

If drawing information is input using the tablet 15 when these human or calligraphy projection modes are selected, the drawing information 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 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 it is desired to display only a handwritten memo or the like in addition to the calligraphy or drawings, the blackboard key 16Z of the keyboard 16 is turned on. That is, when the blackboard key 162 is turned on, the key output control circuit 22 switches the changeover switch 35 to the selected terminal a side, and switches the black screen signal from the black screen signal generation circuit 36 instead of the video signal. The signal is sent to the selected terminal a of the switch 27. 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.

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.

〔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, by selecting the second mode and displaying only the drawing information on the monitor, an easy-to-see display according to the drawing content becomes possible.

[Brief explanation of the drawing]

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. 1...Monitor 2...Portrait camera 3...Document camera 5...Tablet (drawing input means) 6...
... Keyboard 6X ... Person key 6Y ... Calligraphy key 162 ... Blackboard key 17 ... Codec 18 ... Modem 20 ... ... Controller 21 ... Tablet input/output control circuit 22 ...
...Key person output control circuit 23--9-...Drawing information control circuit 27.32.33.35...Switch switch 36
・・・・・・Black screen signal generation 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; and a second mode in which only the drawing information is displayed on the monitor.