JPS62236280A - Imagh display system - Google Patents

Abstract

PURPOSE:To realize an image display system excellent in operation efficiency by composing output of a cursor signal generating circuit and input video signals and providing an image display unit that monitors the output. CONSTITUTION:Cursor signals are composed with input video signals by an image signal composing circuit 3, and after switched and selected by a change- over switch 5, supplied to a video projector from an output terminal 17 and displayed on a screen. A lecturer etc. faces audience and shifts a cursor by operating a joy stick while confirming an image which is the same with that displayed on the screen by an image display unit 7 povided in an operation section 6 near at hand. Thus, it makes the lecturer possible to make presentation while pointing a specific position accurately and safely by easy operation.

Description

DETAILED DESCRIPTION OF THE INVENTION 0) Industrial Application Field The present invention relates to an image display system that generates a cursor signal used to indicate a specific part of a diagram at a venue such as a lecture or conference.

(2) Background of the Invention In order to indicate and explain diagrams at lectures and conferences, blackboards, posters, and slide projectors have traditionally been used.
(overhead projector) etc. have been used. Recently, as video projectors have become larger,
Display using a video deck or still video projector is now possible. This method allows easy and rich color expression, makes it easy to create diagrams, and does not require darkening the venue. It has the following features.

(3) Problems to be solved by the invention However, when a pointing stick is applied to an image projected on the screen of a video projector to add an explanation, the shadow of the pointing stick spreads across the screen, making it very unsightly. .

Furthermore, since the surface of a cathode ray tube video projector is glass, there is a risk of damaging the glass when the pointing stick is applied to it, and there is also the disadvantage that the pointing position may be inaccurate due to the thickness of the glass. .

It is also possible to generate characters and symbols using a character generator such as a personal computer and synthesize them onto the screen of a video projector, but with conventional equipment, the operation of each individual device is complicated and difficult to use. Therefore, there was a problem that it was not suitable for use in lectures and conferences.

(4) Means for Solving the Problems The present invention has been made in view of the above points, and aims to provide an image display system with excellent operability. The apparatus is configured to include a cursor signal generation circuit that generates a signal, an image signal synthesis circuit that synthesizes the output of the cursor signal generation circuit and a human image signal, and an image display system that monitors the output of the image signal synthesis circuit. There is.

(5) Examples Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a block diagram showing an embodiment of an image display system according to the present invention.

In FIG. 1, the main body portion 15 will be explained first. A video signal from a video deck, still video player, video camera, etc. is applied to an input terminal 1 of the main body section 15. This video signal is supplied to a cursor signal generation circuit 2 and an image signal synthesis circuit 3.

As will be described later, the cursor signal generation circuit 2 generates a cursor signal for indicating a specific position in a drawing to be presented at a lecture or conference. The cursor can be a circle, an arrow,
Possible combinations of brackets, underlines, rectangles, and map shapes are possible.

For example, if you specify two points on the screen, a rectangle with diagonal lines between those two points may be generated, or if you specify several points on the screen, a figure that surrounds it with a straight line or a curved line may be generated. Alternatively, a cursor may be used that masks parts other than the part to be specified.

It is desirable to have several colors for the cursor, and to be able to freely select and use them.

The output of the cursor signal generation circuit 2 is output from the image signal synthesis circuit 3.
is combined with the human video signal. Synthesis is performed by analog addition or subtraction. Whether composition is performed by addition or subtraction is determined by the relationship with the font memory 12, which will be described later. For example, to display a white (or black) arrow as a cursor, a video signal that has a white level at the arrow part is created in the font memory 12, and then added to the input video signal in the image signal synthesis circuit 3 (in the case of black is done by subtracting).

The cursor signal generation circuit 2 is configured as shown in FIG. 2, for example.

The input video signal applied to the input terminal l is supplied to the synchronization separation circuit lO, where the vertical synchronization signal ■ and the horizontal synchronization signal H are separated. The vertical synchronizing signal (■) and the horizontal November signal (H) are supplied to the next counter 11. counter 1
1 detects the vertical position and horizontal position on the screen by using the vertical synchronizing signal V as a reset signal, counting the horizontal synchronizing signal H, and further counting the clock synchronized with the horizontal synchronizing signal H. The count value of the counter 11 is preset by operating a joystick 13 provided on the operation panel 8 of the operation section 6. This counter 11 detects that the scanning point has come to the position where the cursor is desired to be displayed, gives an instruction to the font memory 12, and sends an image from the font memory 12 to the image signal synthesis circuit 3 according to the shape of the cursor signal. Output a signal.

The cursor signal is synthesized with a human video signal by the image signal synthesis circuit 3, and after being selected by the changeover switch 5, it is output from the output terminal 17 to a video projector 18 (sixth
(Fig. 6) and displayed on the screen 19 (Fig. 6).

The main body 15 includes a changeover switch 4 for changing the signal.
and 5 are provided. The changeover switch 4 is for switching the image signal to be displayed on the image display device 7 provided in the operation section 6, and is used to select between the input video signal applied to the input terminal 1, the output signal of the cursor signal generation circuit 2, The output signal of the image signal synthesis circuit 3 is switched. Further, the changeover switch 5 is for switching the output signal supplied to the video projector 18, and switches between the input video signal applied to the input terminal 1 and the output signal of the image signal synthesis circuit 3. The changeover switch 4 and the changeover switch 5 are both operated by a push button 14 provided on the operation section 6.

Next, the operation section 6 shown in FIG. 1 will be explained.

The operation section 6 is used to set preset values of the cursor signal generation circuit 2 provided in the main body section 15, and to set changeover switches 4 and 5.
The image display device 7 receives a video signal from the input terminal 1 or the changeover switch 4 and displays it on the image display device 7. The operating section 6 is connected to the main body section 15 by wire or wirelessly, so that the above-described control of the cursor signal generating circuit 2 and the changeover switch 4 can be performed remotely. Figure 1 shows
The case where remote control is wired is shown.

The operating section 6 is configured as shown in FIG. 3. That is, an image display device 7 and an operation panel 8 are provided on the front, and a joystick 13 for controlling the cursor signal generation circuit 2 and a pushbutton 14 for controlling the changeover switches 4 and 5 are provided on the operation panel 8. ing. As the image display device 7, in addition to a CRT, an LED, an LCD, a plasma display, etc. can be used. Also joystick 13
Other devices that can be used include a mouse, light pen, and touch screen. In addition to being used separately from the main body part 15, the operating part 6 is used in a state where it can be detached from and integrated with the main body part 15 as shown in FIG. Furthermore, as shown in FIG. 5, the main body 15 may incorporate a still video drive 21 or other recording/reproducing device such as a VTR. In this case, it is preferable to provide an input/output terminal 22 on the main body section 15 for the still video drive 21.

The operating section 6 and main body section 15 are used as shown in FIG. That is, the lecturer or the like faces the audience, and while checking the same image displayed on the screen 19 on the image display device 7 provided in the operation unit 6 at hand, operates the joystick 13 to move the cursor. move it. As a result, the presenter and the like do not need to look at the screen 19, and can easily and safely specify a specific position and give a presentation.

FIG. 7 is a block diagram showing another embodiment of the image display system according to the present invention. In the figure, the same reference numerals are given to the same components as in FIGS. 1 to 6, and explanations thereof will be omitted.

In this embodiment, a human image memory circuit 24 and an output image memory circuit 25 are added to the circuit shown in FIG. There is. In accordance with this, the changeover switch 4 is also configured to select the signal to be supplied to the output terminal 17. Note that the changeover switch 4, changeover switch 5, switches 28 and 29, and changeover switches 30 and 31, which will be described later, are connected to the pushbutton 14 of the operation unit 6.
controlled by

Human power image memory circuit 24 and output image memory circuit 2
5 has the same configuration, and the switch 28 (switch 29) is left open when storing the image. switch 28
When the switch 29 is closed, an image signal is supplied to the image memory circuit 26 (image memory circuit 27). Image memory circuit 26 (image memory circuit 27)
consists of an A/D converter, a digital memory, and a D/A converter. A floppy disk device can also be used in place of the image memory circuit 26 (image memory circuit 27). Further, it is also possible to record and reproduce the analog signal as it is on a still video floppy device, VTR, etc. The output of the image memory circuit 26 (image memory circuit 27) is
It is output after being switched by the changeover switch 30 (changeover switch 31).

By providing the human image memory circuits 24 and 25, while displaying the image signal stored in the image memory circuit 27 on the screen 19, the contents stored in the image memory circuit 26 can be transferred to the cursor signal generation circuit 2 and the image signal synthesis circuit. The image combined with the cursor signal in Step 3 can be checked in advance on the image display device 7 in preparation for the next display.

The human image memory circuit 24 is used to capture moving images from a VTR or the like as still images, and the video output device connected to the input terminal l can continuously output the same image (still image). If so, it can be omitted.

(6) Effects of the Invention As explained above, the present invention includes a cursor signal generation circuit that generates a cursor signal, an image signal synthesis circuit that synthesizes the output of the cursor signal generation circuit and a human image signal,
Since an image display device is provided to monitor the output of the image signal synthesis circuit, it is possible to check the image at hand using this image display device, making it possible to obtain an image display system with excellent operability. Become.

'4.1liJ! (7) □, 1 FIG. 1 is a block diagram showing an embodiment of the image display system according to the present invention, FIG. 2 is a block diagram explaining the cursor signal generation circuit 2 shown in FIG. 1, and FIGS. FIG. 6 is a perspective view illustrating how the image display system according to the present invention is used, and FIG. 7 is a block diagram showing another embodiment of the image display system.

2...Cursor signal generation circuit 3... Image signal synthesis circuit 6...Operation unit 7... Image display device 8...Operation panel 13...joystick 14...Push button 15... Main body part 18...Video projector 19...Screen Patent applicant: Konishiroku Photo Industry Co., Ltd. Agent Patent attorney Yama 1) Takeki Figure 1 Figure 2 Figure 3 i4 figure Figure 5 Figure 6 q

Claims (4)

[Claims] (1) a cursor signal generation circuit that generates a cursor signal, an image signal synthesis circuit that synthesizes the output of the cursor signal generation circuit and an input image signal, and an image display device that monitors the output of the image signal synthesis circuit; An image display system comprising an image display device that displays the output of the image signal synthesis circuit on a large screen. (2) The image display system according to claim 1, wherein the cursor signal generation circuit includes a display position changing circuit that changes the display position of the cursor signal. (3) The image display system according to claim 2, wherein the display position changing circuit is controlled by a remote control device. (4) The image display system according to claim 3, wherein the image display is provided on the remote control device.