JP2000341588A - Video display device having camera apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overlap a video pattern on a sheet table on a video from an external equipment connected to a video input terminal and to display them. SOLUTION: A video level decision circuit 22 compares a level of an imaged video signal a1 with a reference level, discriminates the pattern part of a subject, outputs a binarized video signal c1 and supplies it to a video signal processing circuit 27 via a synchronous conversion circuit 23. The circuit 27 converts a binarized video signal f1 and a video signal b1 from a video input terminal 21 into a video signal g1 for display by overlapping the signal f1 on the signal b1 and supplies it to a liquid crystal panel 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device with a document camera device for photographing a subject placed on a document stage and displaying the image on image display means.

[0002]

2. Description of the Related Art Conventionally, presentations have been made using a television monitor, but in recent years, various presentations have been made using one or more CRT (cathode ray tube) projectors or the like.

Further, recently, there has been an increasing demand for liquid crystal projectors so that presentations can be made not only in large presentations but also in small booths, conference rooms, and small spaces such as schools.

In such a situation, a projection type display device with a document camera for photographing a document or the like and displaying it on a video display means has been widely used for presentation instead of the previous OHP (overhead projector). 2. Description of the Related Art A projection display device with a document camera captures an image of an object such as a document placed on a document table using a document camera, and projects the captured content on a screen.

FIG. 7 is a perspective view showing such a conventional projection display device with a document camera device.

In FIG. 7, a projection display device 8 with a document camera device comprises a document camera device 80 and a projection display device main body 90. The document camera device 80 includes a document table 81, a video camera 82, and illumination devices 83 and 84.
It is composed of

The projection display device main body 90 has a document table 81 disposed on the upper surface, a projection lens mounted on the front side, and one end of arms 85, 86, 87 mounted on the rear side. A video camera 82 and lighting devices 83 and 84 are attached to the other ends of the arms 85, 86 and 87, respectively.

The output terminal of the video camera 82 is connected to the arm 8
5 is connected to the projection display device main body 90 via a cable inside. The illuminating devices 83 and 84 illuminate an imaging target such as a document on the document table 81 with illumination light.

[0009] The projection display device 8 with a document camera device comprises:
An image pickup object placed on the platen 81 is
2, and the video signal of the object to be imaged is projected on a screen 91. The projection display device 8 with a document camera device can also project a video signal from an external video signal output device 89 connected to a video input terminal 88.

As described above, the conventional projection display device 8 with a document camera device directly projects a real object to be imaged using the video signal from the document camera device 80.
If the object to be imaged is pointed out with a stick or the like, the image is projected as it is, which is very convenient for explaining. However, when projecting an image from an external device connected to the image input terminal, it does not mean that the object on the spot is being projected. There is no other method than pointing to the upper screen, and there is a problem that the person to explain hides the image on the screen.

[0011]

In the above-described conventional projection display device with a document camera device, when projecting an image from an external device connected to an image input terminal, a description will be given while pointing to a part of the image. There is no other way to do this than pointing to the screen on the screen, and there is a problem that the person to be explained hides the video on the screen.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image display apparatus which eliminates the above-mentioned problems and which can display an image from an external device connected to an image input terminal by superimposing an image pattern on a writing desk. .

[0013]

According to a first aspect of the present invention, there is provided a document camera, comprising: a video input terminal to which a video signal from an external device is guided; a document table for arranging an object to be imaged; A video camera that captures an image of an imaging target and outputs a video signal, a display mode selection unit that selects a display mode by a predetermined input operation, and a video signal of the video camera based on the selection of the display mode selection unit. A switching circuit for switching and outputting a video signal from a video input terminal; a video level determination circuit for performing a level determination on the video signal from the video camera and outputting a binary signal of the determination result; When the mode selection means selects a mode in which only one of the video signal of the video camera and the video signal of the video input terminal is displayed, the switching mode is selected. A video signal from the video camera is converted into a video signal for display and displayed on video display means, and the display mode selection means superimposes and displays the video signal of the video camera and the video signal of the video input terminal. When selected, the video based on the binarized signal from the video level determination circuit is superimposed on the video based on the video signal from the video input terminal, and the superimposed video is converted into a video signal for display to display the video. And a video signal processing circuit for displaying on the means.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a case where the first embodiment of the video display device with a document camera device according to the present invention is applied to a projection display device with a document camera device.
The detailed configuration of the document camera device will be described with reference to FIG.

In FIG. 1, a projection display device 1 with a document camera device comprises a document camera device 10 and a projection display device main body 20. The document camera device 10 includes a document table 81 on which the object to be imaged shown in FIG. 8 is arranged, a video camera 82 attached to the document table 81 to image the object to be output, and output a video signal a1, and a lighting device. 8
3, 84.

The projection display device 1 with a document camera device comprises:
An image pickup object placed on the platen 81 is
2 and the video signal a1 of the object to be imaged is screen 3
1 is projected. Further, the projection display device 1 with the present document camera device can also project a video signal b1 from an external video signal output device connected to the video input terminal 21 of the projection display device main body 20.

Hereinafter, the projection display device main body 20 will be described in detail.

The projection display apparatus main body 20 includes a video input terminal 21, a video level determination circuit 22, a synchronization conversion circuit 23, a synthesis circuit 24, an on-screen display circuit 25, and a switching circuit 2.
6, video signal processing circuit 27, display mode selection means 28,
It comprises a liquid crystal panel 29 and a lamp 30.

Video signal a captured by the document camera 10
1 is guided to a first input terminal of the video level determination circuit 22 and the switching circuit 26.

On the other hand, the video signal b1 from the external device guided to the video input terminal 21 is guided to the second input terminal of the switching circuit 26.

The video level determination circuit 22 performs a level determination on the video signal a1 from the video camera of the document camera apparatus 10, and supplies a binary signal c1 of the determination result to the synchronous conversion circuit 23. In this case, the video level determination circuit 22 determines a signal having a luminance lower than a certain level with respect to the video signal a1, determines that the determined portion is a pattern of a subject to be displayed as a video, and determines the determination result. Is output to the synchronous conversion circuit 23.

In the synchronous conversion circuit 23, the document camera 1
The synchronizing conversion is performed so that the binarized signal c1 driven by the synchronizing signal of 0 is synchronized with the video signal b1 from the video input terminal 21, and the first signal of the synthesizing circuit 24 is converted into the binarized signal d1.
Supply terminal.

On the other hand, the on-screen display circuit 25 synchronizes with the video signal b1 from the video input terminal 21 to generate characters and graphics of information necessary for operating the display device 1, and to generate a character or graphic at the pixel at the current synchronization position. A binarized signal e1 indicating whether or not a character or graphic pattern exists is created and output to a second input terminal of the synthesis circuit 24.

When at least one of the supplied binary signals d1 and e1 indicates that a pattern exists, the synthesizing circuit 24 outputs a binary signal f indicating that a pattern exists.
1 is output, and when both of the binary signals d1 and e1 indicate that there is no pattern, a binary signal f1 indicating that there is no pattern is output.

The display mode selection means 28 selects a display mode by a predetermined input operation such as a key input operation using a remote controller, and controls the switching circuit 26 and the video signal processing circuit 27 based on the selection.

The switching circuit 26 includes a display mode selecting means 28
The video signal a1 of the video camera and the video signal b1 of the video input terminal 21 are switched and output based on the selection.

The video signal processing circuit 27 selects a mode in which the display mode selecting means 28 displays only one of the video signal a1 of the document camera device 10 and the video signal b1 of the video input terminal 21. In this case, the video signal from the switching circuit 26 is converted into a video signal g1 for display and supplied to the liquid crystal panel 29 of the video display means, and the display mode selecting means 28 outputs the binarized signal f from the synthesizing circuit 24.
1 and the video signal b1 of the video input terminal 21 are superimposed and displayed, the video by the binarized signal f1 from the synthesizing circuit 24 is superimposed on the video by the video signal from the switching circuit 26. The superimposed video is converted into a video signal g1 for display and supplied to the liquid crystal panel 29.

The liquid crystal panel 29 displays a video signal g1 for display.
The light of the lamp 30 is transmitted and the image light is emitted in a state where the transmittance is controlled on the basis of. The image light emitted from the liquid crystal panel 29 is projected on a screen 31 by a projection lens (not shown).

FIG. 2 is a block diagram showing an example of the synchronous conversion circuit 23 of FIG.

In FIG. 2, the synchronous conversion circuit 23 includes a write control circuit 11, a memory 12, and a read control circuit 13. Write control circuit 11
Causes the binary signal c1 to be written into the memory 12 by the synchronization signal of the document camera 10. The read control circuit 13 reads data from the memory 12 with a synchronization signal for driving the liquid crystal panel 29. As a result, the memory 12 outputs the synchronously converted binary signal d1.

Since the binarized signal c1 input to the synchronous conversion circuit 23 has been binarized in the video level determination circuit 22, there is no need for analog / digital conversion.

Hereinafter, the operation of the present embodiment will be described. In this case, for the sake of simplicity, the binarized signal e1 from the on-screen display circuit 25 is assumed to be in a non-signal state.

When only the video from the video input terminal 21 is displayed, the switching circuit 26 selects the video signal b1 from the video input terminal 21. Selected video signal b1
Is displayed on the liquid crystal panel 29 as a video signal g1 via the video signal processing circuit 27, and is projected on the screen 31.

When only the image from the document camera device 10 is displayed, the switching circuit 26 operates
From the video signal a1, and the selected video signal a1
Is similarly projected on the screen 31.

When the image from the document camera device 10 is superimposed on the image from the image input terminal 21 and displayed,
The switching circuit 26 selects the video signal b1 from the video input terminal 21, and the video signal processing circuit 27 performs the binarized signal f1 obtained by binarizing the video from the document camera device 10 and the video from the switching circuit 26. The video signal is displayed on the liquid crystal panel 29 as a superimposed video signal g1.
Projected onto

FIG. 3 is an explanatory diagram showing the operation when the image from the document camera device 10 is superimposed on the image from the image input terminal 21 and displayed.

In FIG. 3, reference numeral 41 denotes a video input terminal 2.
1 shows a screen based on the video signal b1 input from the reference numeral 1, reference numeral 42 denotes paper on a document table, and reference numeral 43 denotes a screen 31.
FIG. On the screen 41, “Target for the current term”, “17 patent proposals!”, “Target achieved!”
! Are displayed.

When a video signal of the screen 41 is input from the video input terminal 21 and ellipses, check marks, and horizontal lines 47, 48, and 49 are drawn on the paper 42 on the platen, the screen 43 is displayed. The images can be projected by superimposing the figures 47, 48 and 49 on the images 44, 45 and 46 as shown.

As described above, according to the present embodiment, the image from the external device connected to the image input terminal can be displayed by superimposing the image pattern on the writing desk. When projecting an image from an external device connected to the terminal,
By drawing characters and figures on paper on a writing desk, it is possible to indicate the image on the image display means without going to the screen, which is very convenient for the user.

FIG. 4 is a block diagram showing a case where the second embodiment of the video display device with a document camera device according to the present invention is applied to a projection display device with a document camera device.
The same components as those in the embodiment of FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 4, the difference between the projection type display device 5 with the document camera device and the embodiment shown in FIG. 1 is that in the projection type display device main body 50, the image level judgment for judging the output level of the document camera device 10 is made. That is, a video level / color determination circuit 52 is used instead of the circuit.

The video level / color determination circuit 52 performs a level determination and a color determination on the signal a1 input from the document camera device 10 to determine a plurality of types of patterns captured by the video camera of the document camera device 10. And outputs a signal c2 as a result of the determination. In the synchronous conversion circuit 53, the signal c2 driven by the synchronization signal of the document camera device 10 is synchronously converted into a signal d2 driven in synchronization with the video signal b1 input to the video input terminal 21. The synchronously converted signal d2 is combined with the on-screen display signal e1 by the combining circuit 54, and is supplied to the video signal processing circuit 57 as the signal f2. The video signal processing circuit 57 converts the signal f2 from the synthesizing circuit 54 when the display mode selecting means 28 selects a mode in which the signal f2 from the synthesizing circuit 54 and the video signal b1 at the video input terminal 21 are displayed in a superimposed manner. To create an image of a pattern displayed in a plurality of types of colors, superimpose the image of the pattern on the image based on the image signal b1 from the image input terminal 21, and convert the superimposed image into an image signal g2 for display. Then, the image is displayed on the liquid crystal panel 29 of the image display means. Thus, when the video signal a1 of the pattern (for example, a figure written on paper) from the document camera apparatus 10 and the video signal b1 of the video input terminal 21 are displayed on the screen 31 in a superimposed manner, The color is displayed in the same color as the color of the pattern on the table.

FIG. 5 shows the video level / color determination circuit 52 of FIG.
FIG. 4 is a block diagram showing an example of the above.

In FIG. 5, terminals 61 to 63 are respectively provided with a luminance signal a11 based on a video signal a1 and an RY signal a.
12, the BY signal a13 is input. Each signal is binarized by the video level determination circuits 64 to 66 according to the level of each signal, and black, red, and blue binary signals h11 and h1 are output.
2 and h13 are supplied to the encoding circuit 67. The encoding circuit 67 outputs the binary signals h11, h12, h1.
3 is encoded and output as a signal c2 representing each color. Therefore, the video level / color determination circuit 52 can determine the color of the pattern on the document table based on the level of the luminance / color difference signal input from the document camera device 10 and output the same.

FIG. 6 is an explanatory diagram showing the operation in the case where the image from the document camera device 10 is superimposed on the image from the image input terminal 21 and displayed in the embodiment of FIG.

In FIG. 6, reference numeral 71 denotes a video input terminal 2.
1, a screen 72 based on the video signal b1 input from the reference numeral 1, reference numeral 72 indicates paper on the platen, and reference numeral 73 indicates the screen 31.
FIG. On the screen 71, “Target for the current term”, “17 patent proposals!”, “Target achieved!”
! Are displayed as images 74, 75, and 76.

When a video signal of the screen 41 is input from the video input terminal 21 and black, red, and green figures 77, 78, and 79 are drawn on the paper 42 on the platen, the screen 73 is displayed.
As shown in the figure, images 77, 78,
79 can be superimposed to project an image.

According to such an embodiment, an image from an external device connected to the image input terminal can be displayed by superimposing the image pattern on the writing desk, which is the same as the embodiment of FIG. In the embodiment of FIG. 1, when the video from the video input terminal is superimposed with the video pattern on the writing desk, the video on the writing desk can be displayed in only one color. In the embodiment,
Since the display can be performed in a plurality of colors corresponding to the color of the image of the pattern on the writing desk, the discriminability in performing such display can be improved.

In the embodiment shown in FIGS. 1 to 6, the binary signal e1 from the on-screen display circuit 25 can be displayed.
5 may be applied to a device that does not use the same. Further, the liquid crystal panel and the lamp are used as the image display means in FIG. 1, but various types of image display means such as a cathode ray tube can be applied.

[0051]

According to the present invention, an image from an external device connected to a video input terminal can be superimposed on a video pattern on a writing desk and displayed, so that an external device connected to the video input terminal can be displayed. When projecting video from
By pointing on the writing desk or drawing characters or figures on paper on the writing desk, it is possible to indicate the image on the image display means, which is very convenient for the user.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a video display device with a document camera device according to the present invention.

FIG. 2 is a block diagram showing an example of a synchronous conversion circuit of FIG. 1;

FIG. 3 is an explanatory diagram showing the operation of the embodiment of FIG. 1;

FIG. 4 is a block diagram showing a second embodiment of the video display device with the document camera device according to the present invention.

FIG. 5 is a block diagram illustrating an example of a video level / color determination circuit in FIG. 4;

FIG. 6 is an explanatory diagram showing the operation of the embodiment in FIG. 4;

FIG. 7 is a perspective view showing a conventional projection display device with a document camera device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Projection display apparatus with a document camera apparatus 10 Document camera apparatus 20 Projection display apparatus main body 21 Video input terminal 22 Video level judgment circuit 23 Synchronous conversion circuit 24 Synthesis circuit 25 On-screen display circuit 26 Switching circuit 27 Video signal processing circuit 28 display mode selection means 29 liquid crystal panel 30 lamp 31 screen

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[Procedure amendment]

[Submission date] July 6, 2000 (200.7.6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

Patent application title: Video display device with camera device

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device with a camera device for photographing a subject placed on a writing desk and displaying the image on image display means.

[0002]

2. Description of the Related Art Conventionally, television monitors have been used for various presentations.
(Cathode Ray Tube) Various presentations have been made using one or more projectors or the like.

Further, recently, there has been an increasing demand for liquid crystal projectors so that presentations can be made in small booths, conference rooms, and small spaces such as schools.

In such a situation, a projection display device with a camera for photographing a document or the like and displaying it on a video display means has been developed.
It has been widely used for presentations instead of HP (overhead projector). 2. Description of the Related Art A projection display device with a camera uses a document camera to capture an image of an object to be captured such as a document placed on a documentary desk, and projects the captured content on a screen.

FIG. 7 shows such a conventional projection display device with a camera.

In FIG. 7, a projection display device 8 with a camera includes a document camera device 80 and a projection display device main body 90.
It is composed of The document camera 80 includes a document table 81.
, A video camera 82, and lighting devices 83 and 84.

[0007] One end of arms 85, 86, 87 is mounted on the rear side of the projection display device main body 90, and a video camera 82 and illumination devices 83, 84 are mounted on the other ends of the arms, respectively.

In this manner, the video camera 82 is integrally attached to the projection display device main body 90, and
The writing desk 81 is illuminated by 3, 84, a document or the like placed on the writing desk is photographed by a video camera 82, and the photographed image is projected on a screen 91.

The projection display device main body 90 also has a function of processing a video signal input from an external video device and projecting a video from the external video device.

As described above, the conventional projection display device can directly project an image captured by the video camera 82. Therefore, if the object such as a document is pointed with a stick, the image is also projected as it is. It is very convenient for explaining. However, there is no other way to explain while projecting an image from an external device while pointing to a part of the image, except for pointing to the screen projected on the screen. There were problems such as hiding.

[0011]

In the above-mentioned conventional projection type display device, when projecting an image from an external device, it is necessary to point to a part of the image and to explain the method other than pointing to a screen on a screen. There is a problem that there is no method and the image on the screen is hidden by the shadow of a person to be explained.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned problems and to provide a video display device capable of projecting and displaying a video from an external device and displaying a video pattern captured by a video camera in a superimposed manner. I do. Also,
It is an object to provide a video display device capable of displaying a video pattern captured by a video camera in color.

[0013]

According to the present invention, there is provided a video input terminal to which a first video signal is supplied, a video camera for capturing an image of an object to be captured and outputting a second video signal, and A video signal input, compares the level of the second video signal with a reference level, and outputs a binarized video signal; and a video level determination circuit for selectively outputting the binarized video signal to the first video signal. A camera comprising: a video signal processing circuit capable of generating a video signal for display by superimposing a digitized video signal; and display means for displaying a video based on the display video signal from the video signal processing circuit. It is a video display device with a device. According to the present invention, it is possible to display an image based on a second video signal captured by a video camera on a display image based on a first video signal, and to display the second video signal using a binarization process. -Since only the pattern portion such as a figure is displayed, the superimposed image can be displayed in an easily viewable manner.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of a video display device with a camera device according to the present invention.

In FIG. 1, a projection display device 1 with a camera device includes a document camera device 10 and a projection display device main body 2.
The document camera apparatus 10 includes a document table 81 similar to that shown in FIG. 7 and an image capturing object such as a document attached to the document table 81 and placed on the document table 81, and performs video signal a1. And a document camera device 10 for outputting the same. The document camera apparatus 10 has a video camera 82, and the projection display device body 20 may be provided with an illumination device (not shown) for illuminating the document table 81.
The writing table 81 includes a projection-type display device main body 2 as in FIG.
It is provided on 0, and consists of a white board, etc.
Characters and the like can be directly written on the document, and documents and the like can be placed on the writing desk 81.

The projection display device 1 processes a video signal a1 obtained by photographing a document placed on the writing desk 81 or a character written on the writing desk 81 with the video camera 82 to generate a screen.
Projected onto the screen 31. Also, the projection display device 1
Receives a video signal b1 from an external video device 92 connected to the video input terminal 21 of the projection display device body 20,
The video signal b1 can be processed and projected on the screen 31. The external video device 92 includes a computer device and the like.

Hereinafter, the projection display device main body 20 will be described in detail.

The projection display apparatus main body 20 includes a video input terminal 21, a video level determination circuit 22, a synchronization conversion circuit 23, a synthesis circuit 24, an on-screen display circuit 25, and a switching circuit 2.
6, video signal processing circuit 27, display mode selection means 28,
It comprises a liquid crystal panel 29 and a lamp 30.

The video signal a1 picked up by the video camera 82 of the document camera device 10 is guided to first input terminals of a video level determination circuit 22 and a switching circuit 26.

On the other hand, the video signal b 1 from the external video equipment 83 guided to the video input terminal 21
To the input terminal.

The video level determination circuit 22 determines the level of the video signal a1 captured by the video camera 82,
As a result of this determination, the binarized signal c is obtained and the synchronous conversion circuit 23
To supply. In this case, the video level determination circuit 22 compares the video signal a1 with a reference level, and determines whether the video signal a1 is a signal whose luminance is lower than the reference level,
It is determined that a portion having a luminance lower than the reference level is the pattern of the subject, and a binarized video signal c1 of the determination result is obtained.
Is output to the synchronous conversion circuit 23.

In the synchronous conversion circuit 23, the video camera 82
Of the video signal c1 driven by the synchronizing signal is synchronized with the video signal b1 from the video input terminal 21 and supplied to the first input terminal of the synthesizing circuit 24 as the converted video signal d1. I do.

On the other hand, the on-screen display circuit 25 synchronizes with the video signal b1 from the video input terminal 21 to generate a signal such as a character or a figure of information necessary for operating the display device 1, and generates a pattern of the character or the figure. Is supplied to the second input terminal of the synthesizing circuit 24.

The synthesizing circuit 24 outputs the binarized image d.
1 and the on-screen signal e1, and outputs a synthesized binary signal f1.

The display mode selection means 28 includes a remote controller 93
The display mode is selected by the user operating a predetermined key provided in the, and the switching circuit 26 and the video signal processing circuit 27 are controlled based on this selection.

The switching circuit 26 includes a display mode selecting means 28
The video signal a1 from the document camera device 10 and the video signal b1 from the video input terminal 21 are switched and output based on the selection of.

In the video signal processing circuit 27, the display mode selecting means 28 determines whether the video signal a1
And a mode in which only one of the video signals b1 from the video input terminal 21 is displayed, the selected video signal a1 or b1 is processed and converted into a display video signal g1. LCD panel 2 for image display means
9. Further, the display mode selecting means 28 controls the binarized signal f1 from the synthesizing circuit 24 and the video input terminal 21.
When the mode of superimposing and displaying the video signal b1 is selected, the video based on the binarized signal f1 from the synthesizing circuit 24 is superimposed on the video based on the video signal b1 from the switching circuit 26, and the superimposed video is The signal is converted into a display video signal g1 and supplied to the liquid crystal panel 29.

The liquid crystal panel 29 emits image light which is irradiated with light from the lamp 30 and whose transmittance is controlled based on the image signal g1. The image light emitted from the liquid crystal panel 29 is transmitted to the screen 3 by a projection lens (not shown).
1 is projected.

FIG. 2 is a block diagram showing an example of the synchronous conversion circuit 23 of FIG.

In FIG. 2, the synchronous conversion circuit 23 includes a write control circuit 11, a memory 12, and a read control circuit 13. Write control circuit 11
Causes the binary video signal c1 to be written into the memory 12 based on the synchronization signal from the document camera device 10. The read control circuit 13 reads the memory 12 based on the synchronization signal of the video signal b1 for driving the liquid crystal panel 29. As a result, the memory 12 outputs the synchronously converted binary video signal d1.

Since the binarized video signal c1 input to the synchronous conversion circuit 23 has been binarized in the video level determination circuit 22, there is no need for analog / digital conversion.

Hereinafter, the operation of the present embodiment will be described. In this case, for simplification of description, it is assumed that the on-screen signal e1 from the on-screen display circuit 25 is in a non-signal state.

The video input terminal 2 is operated by operating the remote control 93.
When the mode for displaying only the image from the video input terminal 1 is selected, the switching circuit 26 outputs the video signal b from the video input terminal 21.
Select 1. The selected video signal b1 is converted into a video signal g1 via the video signal processing circuit 27 as a liquid crystal panel 29.
And projected on the screen 31.

When the mode for displaying only the image from the document camera device 10 is selected, the switching circuit 26 selects the video signal a1 from the document camera device 10, and the selected video signal a1 is similarly changed. The image is projected on the screen 31.

When the mode for superimposing and displaying the image from the document camera device on the image from the image input terminal 21 is selected, the switching circuit 26 selects the image signal b1 from the image input terminal 21 and displays the image. The signal processing circuit 27 combines the binarized binarized video signal f1 from the document camera apparatus 10 with the video signal B1, generates a superimposed video signal g1 and displays it on the liquid crystal panel 29, and projects it on the screen 31. I do.

FIG. 3 is an explanatory diagram showing an operation in a mode in which an image from the document camera apparatus 10 is superimposed on an image from the image input terminal 21 and displayed.

In FIG. 3, reference numeral 41 denotes a video input terminal 2.
1 shows a display screen based on a video signal b1 input from 1;
Reference numeral 42 indicates paper placed on the writing desk 81, and reference numeral 43 indicates a display screen projected on the screen 31. On the screen 41, images 44, 45, and 46 of "20 goals for this term", "17 patent proposals!", And "achieve goals!"
Is displayed.

When the video signal of the screen 41 is input from the video input terminal 21 and an ellipse, a check mark, and horizontal lines 47, 48, and 49 are drawn on the paper 42 on the writing table, the screen 43 is displayed. Figures 47 and 4 are added to the images 44, 45 and 46.
8, 49 can be projected and displayed.

As described above, according to the present embodiment, the image from the external device can be displayed by superimposing the image from the external device on the image of the document table. By pointing on the writing desk or drawing characters or figures on the writing desk, the images can be superimposed and displayed, and the video can be indicated without going to the screen, which is very convenient for the user. In addition, since the video signal from the document camera device 10 is binarized by the video level determination circuit, only characters and figures are displayed in a superimposed manner.

FIG. 4 is a block diagram showing a second embodiment of the video display apparatus according to the present invention. The same components as those in the embodiment of FIG. I have.

In FIG. 4, the projection display device 5 comprises a document camera device 10 and a projection display device 50. The difference from the embodiment of FIG. 1 is that a video level / color determination circuit 52 is used instead of the video level determination circuit 22 that determines the output level of the video camera 82.

The video level / color determination circuit 52 determines the level and color of the video signal a1 input from the document camera device 10, and determines the level and color of the pattern captured by the video camera 82. , And outputs the video signal c2 of the result of this determination. In the synchronization conversion circuit 53, the video signal c2 driven by the synchronization signal of the document camera apparatus 10
Is driven by the synchronizing signal of the video signal b1 input to the video input terminal 21 to output a synchronously converted color signal d2. The synchronously converted color signal d2 is combined with the on-screen signal e1 by the combining circuit 54, and is supplied to the video signal processing circuit 57 as a color video signal f2. The video signal processing circuit 57 is configured such that the display mode selecting means 28
When the mode of superimposing and displaying the color video signal f2 from No. 4 and the video signal b1 of the video input terminal 21 is selected, the color video signal f2 is superimposed on the video signal b1 to generate a video signal g2 for display. To the liquid crystal panel 29. Thus, on the screen 31, the video signal a1 of the pattern (for example, a figure written on paper) on the writing desk from the document camera apparatus 10 and the video signal b1 from the video input terminal 21 can be displayed in a superimposed manner. It can be displayed in a color similar to the color of the pattern written on the document desk.

FIG. 5 shows the video level / color determination circuit 52 of FIG.
FIG. 4 is a block diagram showing an example of the above.

In FIG. 5, a luminance signal a11 based on a video signal a1 and an RY signal a12 and a BY signal a13 indicating a color difference signal are input to terminals 61 to 63, respectively. The level of each signal is determined by the video level determination circuits 64 to 66 and each signal is binarized, and the signals are encoded as black, red, and blue binarized signals h11, h12, and h13.
7 is supplied. The encoding circuit 67 outputs the binarized signal h
11, h12 and h13 are encoded, and a color video signal c2 is output. Therefore, the video level / color determination circuit 52
Can determine the color of the pattern on the writing desk based on the level of the luminance / color difference signal input from the video camera 82, and output it.

FIG. 6 is an explanatory diagram showing the operation in the case where the video from the video camera 82 is superimposed on the video from the video input terminal 21 and displayed in the embodiment of FIG.

In FIG. 6, reference numeral 71 denotes a video input terminal 2.
1 shows a screen according to the video signal b1 input from the numeral 1, reference numeral 72 denotes a paper on the writing table 81, and reference numeral 73 denotes a screen projected on the screen 31. On the screen 71, from the top, “20 targets for this term”, “17 patent proposals!”
The images 74, 75, 76 of "achieving the goal!" Are displayed.

When a video signal of the screen 71 is input from the video input terminal 21 and black, red, and green figures 77, 78, and 79 are drawn on the paper 72 on the document stage, the screen 73 is displayed.
As shown in the figure, images 77, 78,
79 can be superimposed to project an image.

According to such an embodiment, the image from the external device can be superimposed on the image pattern on the writing desk and displayed, and the same effects as those of the embodiment of FIG. 1 can be obtained. Since the display can be performed in the same color as the color of the pattern written on the table, the discrimination can be improved.

In the embodiment shown in FIGS. 1 to 6, the binary signal e1 from the on-screen display circuit 25 can be displayed.
5 may be applied to a device that does not use the same. Although the liquid crystal panel and the lamp are used as the image display means, a cathode ray tube or the like can be used as the image display means.

[0051]

According to the present invention, the image from the external device connected to the image input terminal can be displayed with the image pattern on the document table superimposed thereon, so that the image from the external device can be projected. In addition, since a part of the displayed image can be pointed out or emphasized by pointing to the writing desk or drawing characters or figures on the writing desk, it is very convenient for the user.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a video display device with a camera device according to the present invention.

FIG. 2 is a block diagram showing an example of a synchronous conversion circuit of FIG. 1;

FIG. 3 is an explanatory diagram showing the operation of the embodiment of FIG. 1;

FIG. 4 is a block diagram showing a second embodiment of the video display device with a camera device according to the present invention.

FIG. 5 is a block diagram illustrating an example of a video level / color determination circuit in FIG. 4;

FIG. 6 is an explanatory diagram showing the operation of the embodiment in FIG. 4;

FIG. 7 is a perspective view showing a conventional video display device with a camera device.

[Description of Signs] 1 Projection display device with camera device 10 Document camera device 20 Projection display device main body 21 Video input terminal 22 Video level judgment circuit 23 Synchronization conversion circuit 24 Synthesis circuit 26 Switching circuit 27 Video signal processing circuit 28 Display mode Selection circuit 29 LCD panel 30 Lamp 31 Screen

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

Claims (2)

[Claims] 1. A video input terminal to which a video signal from an external device is guided, a writing desk on which an object to be imaged is arranged, and a video attached to the writing desk to image the imaging object and output a video signal A camera, a display mode selecting means for selecting a display mode by a predetermined input operation, and a switch for switching and outputting a video signal of the video camera and a video signal of the video input terminal based on the selection of the display mode selecting means. Circuit, a level determination is performed on the video signal from the video camera, and a video level determination circuit that outputs a binarized signal of the determination result. When a mode in which only one of the video signals of the input terminal is displayed is selected, the video signal from the switching circuit is converted into a video signal for display. When the display mode selection means selects a mode in which the video signal of the video camera and the video signal of the video input terminal are superimposed and displayed, the video level determination circuit A video signal processing circuit, which superimposes the video based on the binarized signal on the video based on the video signal from the video input terminal, converts the superimposed video into a video signal for display, and displays the video signal on the video display means. A video display device with a document camera device. 2. A video input terminal to which a video signal from an external device is guided, a writing desk on which an imaging target is arranged, and a video attached to the writing desk, which picks up the imaging target and outputs a video signal. A camera, a display mode selecting means for selecting a display mode by a predetermined input operation, and a switch for switching and outputting a video signal of the video camera and a video signal of the video input terminal based on the selection of the display mode selecting means. A circuit that performs level determination and color determination on a video signal from the video camera, determines a pattern captured by the video camera with a plurality of colors, and outputs a signal of the determination result. A color determination circuit, and the display mode selection means displays only one of the video signal of the video camera and the video signal of the video input terminal. When the mode is selected, the video signal from the switching circuit is converted into a video signal for display and displayed on the video display means, and the display mode selection means selects the video signal of the video camera and the video input signal. When the mode of superimposing and displaying the video signal of the terminal is selected, a video of a pattern displayed in a plurality of types of colors is created using the signal from the video level / color determination circuit, and the video of the pattern is generated. A video signal processing circuit, which superimposes the video on the video based on the video signal from the video input terminal, converts the superimposed video into a video signal for display, and displays the video signal on the video display means. Video display device with camera device.