JPH05150901A - Pointer position coordinate data generating device for picture display device - Google Patents

Abstract

PURPOSE:To provide a pointer picture data generating device where it is unnecessary to provide a screen or the like with a complicated detecting means by generating coordinate data of the pointer position of an invisible light emission point after initializing the positions of outermost points on diagonal lines of a display picture so that they coincide with minimum and maximum coordinate positions of a video camera. CONSTITUTION:A pair of light emitting elements 2a and 2b which emit invisible light like infrared rays are arranged in positions most distant from each other on diagonal lines of the rear face of a screen 1. Light emitting elements 2a and 2b are lit by a switch 11 whose turning-on/off is controlled by a CPU 10. The invisible light emission point is used as a painter 8, and pointer position coordinate data is obtained from the video signal obtained by picking up the image of this point by a video camera 7. Thus, the initializing operation to adjust the zoom ratio of the video camera is so performed that coordinate data obtained by arranging invisible light emission bright points in both corners on diagonal lines of the picture display screen coincide with minimum and maximum coordinates of the video camera 7.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an image display device, and more particularly to a position coordinate data generation device for generating position coordinate data of a position designation tool (hereinafter referred to as a pointer) on a display screen thereof.

[0002]

BACKGROUND ART For example, in an image display device in which a face plate of a CRT is used as a display screen, a matrix electrode is provided on the surface of the face plate, and a touch pen brought into contact with the surface of the face plate is used as a pointer to obtain coordinate data representing this position. There is known a position coordinate data generation device that generates and supplies this to a digital calculation means such as a microcomputer.

[0003]

[Problems to be solved] However, the method of arranging the matrix electrodes on the face plate and using the touch pen as a pointer not only has a problem of high cost but also a so-called projection type in which a wall surface is used as a screen. The beam projection type image display device cannot adopt the above-mentioned touch pen method.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a pointer position coordinate data generation device which can function regardless of the image display system by reducing the cost of the elements provided on the display surface of the image display device to the minimum necessary. It is to be.

[0005]

A video camera, which faces a rectangular display screen of an image display device, captures only an invisible light image on the display screen to generate a composite video signal representing the visible light image, and a video camera based on the composite video signal. Coordinate detecting means for generating coordinate data in which the invisible light image exists,
A pointer position coordinate data generating device comprising: a reference bright spot position detecting means for generating a pair of reference bright spot position data based on the coordinate data within a predetermined period after a calibration command is supplied; And a viewing angle adjusting means for adjusting the viewing angle of the video camera so that the reference bright spot position represented by the point position data exists at the maximum diagonal position on the diagonal line of the rectangular viewing range of the video camera. Pointer coordinate data generating device.

[0006]

When a pointer that emits invisible light is used,
As long as this pointer is within the display screen, correct pointer position coordinate data is generated regardless of the size of the display screen area.

[0007]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows a pointer position coordinate generation device according to the present invention. In this figure, the screen 1 acts as an image display surface of an image display device such as the projection television device shown in FIG. A pair of light emitting elements 2a and 2b that emit invisible light such as infrared rays are arranged at positions most distant from each other on the diagonal line of the back surface of the screen 1. In the projection television apparatus shown in FIG. 2, the screen 1 is arranged in the front opening of the rectangular parallelepiped housing 3, and the image formed on the face plate of the CRT 4 is planarized on the back surface of the screen 1 through the optical system 5. The image reflected by the mirror 6 is emitted and the front surface of the screen is visible. C
A video camera 7 is provided near the RT 4 so that the entire back surface of the screen 1 can be imaged via the mirror 6. Also, the video camera 7 is sensitive only to invisible light. Further, a light emitting element 8a that emits invisible light is provided at the tip of the pointer 8, and it is preferable that the light emitting element 8a can be controlled to be turned on and off by a manual operation.

As is apparent from FIG. 1, the light emitting elements 2a, 2a
Lighting of b is performed by a switch 11 which is on / off controlled by the CPU 10. CPU10 is ROM1
2 Execute the program recorded in advance, and RAM1
3 stores the input data and the calculation result. CP
U10 supplies control data to the viewing angle adjustment circuit 14,
The view angle adjusting circuit 14 supplies a current according to the supplied control data to the step motor 72 that positions the objective lens 71 of the video camera 7 on the optical axis. The pinion 73 is rotated by the step motor 72, and the rotation of the pinion 72 positions the lens holder 74 integrated with the rack engaged with the pinion 72 in the optical axis direction. Incidentally, the lens holder 74 can slide the objective lens 71 in the optical axis direction with respect to the main body of the video camera 7. From the photoconductive layer of the face plate 75a of the image pickup tube 75 to the output terminal according to the scanning of the electron beam according to the horizontal synchronizing signal H and the vertical synchronizing signal V from the synchronizing signal generating circuit 15 formed in the image pickup tube 75. It is well known that video signals are generated. The coordinate data generation circuit 16 generates position coordinate data according to the output video signal of the image pickup tube 75 and the synchronizing signals H and V. A circuit example of the coordinate position data generation circuit 16 is shown in FIG.

As another example of the image display device shown in FIG. 2, a device for displaying an image by projecting ultraviolet rays (hereinafter referred to as UV beam) onto a UV sensitive luminescent screen and scanning the UV beam two-dimensionally. May be When such an image display device is used, the light emitting elements 2a and 2b are provided on the front surface or surface of the screen, and the video camera is juxtaposed with the UV beam irradiation device so as to face the screen.

In the position coordinate generation circuit 16 shown in FIG. 3, the clamp circuit 20 sets the level of a predetermined section of the input video signal from the video camera 7 at a timing corresponding to the H sync signal from the sync signal generation circuit 15. Clamp to the desired level. This prevents a harmful effect due to excessive input of the video signal and stabilizes its level. The video signal that has passed through the clamp circuit 20 is sliced across the zero level by the slice circuit 21, and then differentiated by the differentiator circuit 22. The zero-cross detection circuit 23 detects the zero-cross point of the input video signal by detecting a predetermined level or higher of the output of the differentiating circuit 22, and generates a zero-cross point detection signal.

On the other hand, the PLL circuit 24 generates a clock pulse phase-synchronized with the H synchronization signal and supplies it to the horizontal direction counter 25 clock input terminal. The horizontal direction counter 25 repeats counting clock pulses for each horizontal line (hereinafter referred to as H line). On the other hand, the vertical counter 26 is reset by the vertical synchronizing signal and counts the horizontal synchronizing signal. The count values of both the horizontal direction counter 25 and the vertical direction counter 26 are relayed by the gate circuits 27 and 28 which are triggered by the zero-cross detection signal to open the gate, and the CPU 1
It is transferred to 0 as position coordinate data. CPU
In 10, the position coordinate data is utilized by determining the position of the pointer on the display screen based on the supplied position coordinate data and determining the program to be executed next.

The CPU 10 executes an initialization routine as shown in FIG. 4 by a command via the keyboard 17 so that the position coordinate data is accurately generated. In the initialization routine of FIG. 4, first, the objective lens system 71 of the video camera 7 is maximized (maximum zoom wide) via the view angle adjustment circuit 14 (step S1).
Then, the switch 11 is closed to turn on the light emitting elements 2a and 2b (step S2). Light emitting element 2 at this time
The position coordinate data corresponding to a and 2b is fetched from the coordinate data generation circuit 16 (step S3). X1 for each coordinate data (X1, Y1), (X2, Y2) at this time
And X2 match the horizontal minimum and maximum coordinates Xmin and Xmax of the field of view of the video camera 7, and whether Y1 and Y2 match the vertical minimum and maximum coordinates Ymin and Ymax of the field of view of the video camera 7. It is determined (step S4). If X1, X2 ≠ Xm
If in, Xmax or Y1, Y2 ≠ Ymin, Ymax, the viewing angle θv of the video camera 7 is decreased by a predetermined pitch θ1 (step S5), and step 4 is re-executed. In step 4, X1, X2 = Xmin, Xm
When it is determined that ax and Y1, Y2 = Ymin, Ymax are established, the switch 11 is turned off and the light emitting element 2
The a and 2b are extinguished and the initializing operation is completed (step S6).

It is also conceivable that the operator may use the pointers to point both diagonally opposite corners of the screen 1 to turn on the light-emitting elements at the tips using the switches (not shown) as on-pointers to substitute the light-emitting elements 2a and 2b. .. In this case, step S2 in the subroutine of FIG. 3 is a buzzer sounding step that prompts the operator to place the pointer 8 on any one of the screens 1, and after the zoom adjustment step S5 is executed, the buzzer sounds again. The routine may be a step.

Further, although the rear projection type has been described in the above embodiment, the same position coordinate data can be obtained even with the front project type. In this case, the image is projected from the image projection device to the screen arranged on the wall surface, but the coordinates of both ends of the diagonal line of the image are remembered in advance, and the light emitting elements of the pointer are made to emit light at the both ends thereof. A light emitting point is received by a video camera arranged adjacent to the projection device, and (X1, Y1) and (X2, Y2) are recognized as in the above embodiment, and the coordinates (Xmin, Ymin) stored in advance are also recognized.
The viewing angle of the video camera may be adjusted and fixed by comparing with (Xmax, Ymax).

When the initial coordinates of the pointer coordinate data generating device are set, the coordinates (X1, Y1), (X
2, Y2) to turn on the light-emitting element of the pointer,
The CPU can recognize the coordinates of the illuminated point, and for example, C can be recognized according to the illuminated point of the pointer.
It is also possible to draw a line on the output image from the PU. In addition, by using the output image from the CPU and the screen as the same image to cause the light emitting element of the pointer to emit light, the operation of a mouse such as a so-called microcomputer can be executed.

[0016]

As is apparent from the above, according to the pointer position coordinate data generating device of the present invention, the position of the outermost point on the diagonal line of the display screen coincides with the outermost and maximum coordinate positions of the video camera. Since the coordinate data of the pointer position of the invisible light emitting point is generated after the initialization as described above, it is not necessary to arrange the matrix electrodes on the display screen itself, and the accurate position coordinate data can be obtained by the initialization operation. Can be done.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a section of a projection television device according to the present invention.

FIG. 3 is a circuit diagram showing a specific circuit example of a part of FIG.

4 is a flowchart showing an initialization operation of the apparatus of FIG.

[Explanation of symbols for main parts]

 1 ... Screen 2a, 2b ... Invisible light emitting element 4 ... CRT 6 ... Planar mirror 7 ... Video camera 8 ... Pointer

Claims (1)

[Claims] 1. A video camera, which faces a rectangular display screen of an image display device, captures only an invisible light image on the display screen to generate a composite video signal representing the invisible light image, and the composite video signal. A pointer position coordinate data generation device comprising position coordinate detection means for generating position coordinate data where the invisible light image exists based on the position coordinate data within a predetermined period after a calibration command is supplied. A reference luminescent spot position detection means for generating a pair of reference luminescent spot position data based on the reference luminescent spot position, and a reference luminescent spot position represented by the reference luminescent spot position data exists at a maximum diagonal position on the diagonal of the rectangular visual field range of the video camera. A viewing angle adjusting means for adjusting the viewing angle of the video camera, and a pointer coordinate data generating device.