JPH02306294A - Position detecting device and image display device utilizing the same - Google Patents

Abstract

PURPOSE:To detect a designated position on a large-sized screen by photographing a plane and detecting the designated position on the plane which is designated by a designation means on the basis of a signal outputted from a camera. CONSTITUTION:When laser light is projected from a laser light generator 6 to the plane 1a of projection of the screen 1, an infrared spot is formed on the plane 1a. The infrared image on the plane 1a of projection is photographed by a camera 3 and converted into voltage to be outputted. The voltage outputted from the camera 3 is inputted in a spot position detecting device 4, which detects a spot position where infrared intensity is maximum from the infrared image on the plane 1a of the screen 1 and outputs the X coordinate and the Y coordinate of the spot position. A control part 5 performs specified processing on the basis of the detected result of position to control a color video projector 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a position detection device for detecting a designated position on an image projection surface such as a screen, and an image display device using the position detection device.

(Prior Art) Conventionally, a position detection device is known that detects a designated position on a small tablet, for example, an A4 size tablet. Further, there is also a known device that uses this position detection device to specify a position on a tablet and performs a predetermined process corresponding to the specified position.

(Problems to be Solved by the Invention) However, there is no known position detection device that detects the indicated position on a large screen used in meetings and the like.

For example, in conferences and the like, images such as texts and figures are often projected onto a large screen using a color video projector, and speakers make statements based on this image. In this case, an image that corresponds directly to the content of the speech is projected on the screen, and the speaker who explains the projected image uses an indicator using a He-Ne laser or the like to point out the position on the screen while speaking. It is carried out. Furthermore, when switching the projected images on the screen, commands are input from a switch or a keyboard provided in a control section that controls the driving of the color video projector.

Therefore, when the speaker operates the switch or the keyboard, the progress of the speech is temporarily interrupted.

Further, if an operation such as switching the projected image is performed by someone other than the speaker, the timing of the operation may not match the content of the statement, making it impossible to speak smoothly.

An object of the present invention is to provide a position detection device capable of detecting an instruction position on a large screen as described above, and also to enable a series of instruction operations by a speaker's instruction means by using the position detection device. An object of the present invention is to provide an image display device capable of switching projection images, etc.

(Means for Solving the Problems) In order to achieve the above object, the present invention is defined in claim (1').
Here, an instruction means capable of indicating an arbitrary position on a plane within a predetermined range, a camera that photographs the plane and outputs a signal corresponding to the photographed image, and a A position detecting device is proposed, which includes a position detecting means for detecting a position indicated on the plane by the indicating means.

Further, in claim (2), the position detection device according to claim (1), a projection means for projecting an image onto the plane, and a processing instruction area for instructing a predetermined process on the plane,
The present invention proposes an image display device that performs the predetermined processing based on a position detection result within the processing instruction area by the position detection device and includes a control device that controls image projection by the projection device.

(Function) According to claim (1) of the present invention, an arbitrary position on a plane within a predetermined range is indicated by the indicating means.

Further, the plane is photographed by a camera, and a signal corresponding to this photographed image is output. Furthermore, the position indicated by the indicating means on the plane is detected by the position detecting means based on the signal output from the camera.

Moreover, according to claim (2), the image is projected onto a plane by the projection means. Furthermore, when a position on the plane is designated by the pointing means, this designated position is detected by the position detection device. Further, when the indicated position is within the processing instruction area, the control means performs a predetermined process corresponding to the processing instruction area C' based on the position detection result by the position detection device. , image projection by the projection means is controlled.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of the embodiment. In the figure, 1 is a screen constituting the image projection surface, 2 is a color video projector, 3 is a camera, 4 is a spot position detection device, 5 is a projector control unit that controls the operation of the color video projector 2, and 6 is a laser beam. It is a generator.

The screen 1 is composed of a plain white projection surface 1a and supports 1b that support the projection surface 1a.

The color video projector 2 receives image signals such as video signals and RGB signals, and generates projection light in accordance with the input image signals.
The projection light is projected onto the screen 1 to form an image, and is placed at a position where it can be projected onto the projection surface 1a of the screen 1.

Camera 3 is a CCD (Charge Coupled
This CCD has, for example, 640 pixels in the X direction and 12 pixels in the Y direction.
It has a resolution of 8 pixels. Further, although not shown, the camera 3 is provided with an optical filter that transmits only infrared rays in addition to a lens. Thereby, the camera 3 detects infrared rays generated or reflected from the subject, and sequentially outputs the infrared image obtained from the subject as an electrical analog signal, for example, a voltage, corresponding to each pixel.

This voltage has a voltage value proportional to the intensity of incident light incident on each pixel of the CCD. This camera 3' scans the object at a scanning speed of a predetermined frequency, for example, a frequency of 3 MHz. Further, the camera 3 is arranged at a position where it can photograph only the entire area of the projection surface 1a of the screen 1.

The spot position detection device 4 detects the projection surface la of the screen 1.
The spot position where the infrared intensity is maximum is detected from the above infrared image, and the X and Y coordinates of this spot position are output. That is, the spot position detection device 4
Amplifier 4a, analog/digital (hereinafter referred to as A/D)
Converter 4b.

It is composed of an image memory 4c and a control circuit 4d consisting of an SCPU and the like. The amplifier 4a amplifies the analog signal output from the camera 3 at a predetermined amplification degree, and the A/D converter 4
Output to b. The A/D converter 4b converts the input analog signal into digital data and outputs it to the image memory 4C. As shown in FIG. 3, the image memory 4c has an address corresponding to the resolution of the camera 3, that is, 64
Addresses Axl to A in the X direction corresponding to 0x128 pixels
x 640 and Y direction address Ayl~AY128
Digital data is input from the A/D converter 4b, and one screen worth of data photographed by the camera 3 is stored. The control circuit 4d accesses all addresses of the image memory 4C and detects the address where the stored data has the maximum value.

Thereby, the position where the infrared intensity is maximum on the screen photographed by the camera 3, that is, the position where the infrared intensity is maximum on the projection plane 1a is detected. Further, the control circuit 4d sets the address corresponding to the position on the projection plane la where the infrared intensity is maximum as the X and Y coordinates, and transmits these coordinate data at predetermined time intervals, that is, at a period corresponding to the scanning speed of the camera 3. It is sent to the projector control section 5.

The projector control unit 5 includes a CPU 1 and a data memory 1.
2, a frame memory 13, an overlay memory 14, a camera interface 15, and a display ff1lJ control circuit 16.

The data memory 12 is used to store sentences, figures, etc. to be projected onto the screen 1 in advance, and the data for each projection screen can be read out by the CPU 1.

The frame memory 13 and the overlay memory 14 each correspond to the three primary colors of light "red,""green," and "blue," and each has a memory capacity equivalent to the projection surface of the text, figures, etc. Furthermore, once the contents of the frame memory 13 are written into the frame memory 13, they are retained unless other data is written. On the other hand, the contents of the overlay memory 14 are stored for a predetermined period of time (usually several milliseconds).
If the data is not rewritten within a certain period of time, it will disappear.

The camera interface 15 manually inputs the coordinate data from the spot position detection device 4 and transfers this coordinate data to the CPU II.
It is sent to

The display control circuit 16 is connected to the synchronization separation circuit 2 as shown in FIG.
1. Signal conversion circuit 22, clock generation circuit 23, RGB
It consists of a processor 24 and a mixer circuit 25.

The synchronization separation circuit 21, signal conversion circuit 22, and clock generation circuit 23 are for connecting other video devices such as a TV tuner and VTR. Synchronization separation circuit 21
The synchronizing signal is separated at the synchronous signal generating circuit 23, and the clock generating circuit 23 generates a clock signal using the synchronizing signal as a reference. Furthermore, this clock signal is supplied to the RGB processor 24,
The video signal is converted into an RGB signal by a signal conversion circuit 22.

The RGB processor 24 controls the frame memory 13 according to the clock signal output from the clock signal generation circuit 23.
Then, the contents of the overlay memory 14 are read and RGB signals are created. This RGB signal is inserted into the RGB signal from the signal conversion circuit 22 described above by the mixer circuit 25 and sent to the color video projector 2.

FIG. 5 is a schematic diagram of the laser beam generator 6. As shown in FIG.

In the figure, 30 is a housing, 32 is a semiconductor laser that generates infrared light, 33 is a lens, 34 is a drive circuit, 35 is a battery, and 36 is a power switch.

The housing 30 has a shape that can be held with one hand, for example, a shape similar to a business card package containing 100 cards, and is provided with a laser beam exit port 31 on its lower side.

The semiconductor laser 32 generates laser light in the infrared region, and is disposed such that its light emitting surface faces the exit port 31 .
It is designed to be ejected from 1.

The lens 33 is for converging the laser light emitted from the semiconductor laser 32 and is disposed between the exit port 31 and the semiconductor laser 32.

The drive circuit 34 is a well-known circuit that drives the semiconductor laser 32 , receives power from a battery 35 , and supplies a predetermined drive current to the semiconductor laser 32 .

The laser beam generator 6 described above constitutes the instruction means, and the spot position detection device 4 constitutes the position detection means.

Next, the operation of the spot position detection device 4 having the above-mentioned configuration will be explained based on the control flowchart shown in FIG. .

When a laser beam is emitted from the laser beam generator 6 toward the projection surface 1a of the screen 1, an infrared spot is formed on the projection surface 1a. This infrared image on the projection plane la is photographed by the camera 3, converted into voltage, and output.

The voltage output from the camera 3 is amplified by an amplifier 4a, further converted into digital data by an A/D converter 4b, and then this digital data is stored in an image memory 4C. The digital data input to the image memory 4C at this time is stored in the memory at an address corresponding to each pixel of the camera 3.

The data stored in the image memory 4C is sequentially read out by the control circuit 4d, and the address in the X direction and the address in the Y direction where the data having the maximum value is stored are detected and sent out as coordinate data. That is, the control circuit 4d
As initial settings, variables m and n are set to 1, and the value of maximum value data Dp is set to 0 (Sl). Next, address Axm in the X direction corresponding to the variable m, and Y corresponding to the variable n.
The data D stored in the image memory 4C at the direction address Ayn is read out (S2). Furthermore, it is determined whether the value of the data D is larger than the value of the maximum value data Dp (S3), and when the value of the data D is less than or equal to the value of the maximum value data Dp, the process moves to S6, When the value is larger than the value of the maximum value data Dp, the value of the maximum value data Dp is updated and set to the value of the data D (S4). Further, the value of the variable m at this time is stored as the X coordinate value of the infrared spot position by the laser beam generator 6, and the value of the variable n is stored as the X coordinate value of the infrared spot position (S5).

Next, it is determined whether the value of the variable m has reached 640, which is the number of pixels in the X direction (S6). As a result of this determination, the variable m
If the value of m has not reached 640, 1 is added to the value of variable m, and then the process moves to S2 (S7).

As a result of the determination in S6, when the value of the variable m has reached 640, it is determined whether the value of the variable n has reached 128, which is the number of pixels in the Y direction (S8). As a result of this determination, the variable n
If the value of has not reached 128, 1 is added to the value of variable n and the value of variable m is set to 1, and then the process moves to S2 (S9).

As a result of the determination in S8, when the value of the variable n reaches 128, the stored X coordinate value and the X coordinate value are sent out as coordinate data (5IO), and the process moves to Sl. Thereby, the coordinate values of the designated position on the projection plane la of the screen 1 designated by the laser beam generator 6 are determined.

This coordinate data is sent to the projector control section 5 at predetermined time intervals as described above.

Next, the operation of the above-mentioned projector control section 5 will be explained based on the control flowchart shown in FIG.

For example, when an image is projected onto the projection surface 1a of the screen 1 at a conference, etc., and a speaker makes a statement based on this image, the speaker stores the sentences, figures, etc. necessary for the statement in advance in the data memory 12 for each projection screen. Let me remember it. CPUI of control unit 5
As shown in FIG. 1, I indicates an area line indicating a menu area 40 and a previous screen display instruction area 41 at an address in the frame memory 13 corresponding to the upper right portion of the projection surface 1a of the screen 1.
Image data representing an upward arrow "↑" and a downward arrow "↓" are written in the next screen display instruction area 42 and projected (S P 1).

Next, it is constantly monitored whether or not the coordinate data of the designated position has been input from the spot position detection device 4 (S P 2).
. At this time, since only the aforementioned menu area 40 is written in the frame memory 13, the previous screen and next screen display instruction areas 41 of the menu area 40 are displayed on the projection surface 1a.
．． Only 42 are projected.

The speaker turns on the power switch 36 of the laser light generator 6 to cause the semiconductor laser 32 to generate an infrared laser. By irradiating the projection surface 1a with this infrared laser, a cursor, for example a cross mark "+", is displayed at the position of the infrared spot projected onto the projection surface la. That is,
When the CPU 1 inputs the coordinate data of the infrared spot on the projection surface 1a, it generates the aforementioned cursor pattern "+" from a character generator (not shown), and when the color of the cursor pattern "+" is separated into the three primary colors of light. It is written to the address corresponding to the coordinate value of the infrared spot in the overlay memory 14 corresponding to the color. As a result, a cursor "+" is displayed at the position of the infrared spot on the projection plane la (S P 3).

The position of the infrared spot on the projection surface la can be moved to an arbitrary position depending on the direction of the housing 30 of the laser beam generator 6, that is, the direction of the hand holding the housing 30, and the position of the projected image on the projection surface la can be moved to an arbitrary position. Any position can be easily specified.

When the speaker wants to display the first image necessary for speaking on the projection surface 1a, the speaker moves the cursor described above into the next screen display instruction area 42 of the menu area 40, and selects a predetermined position within the next screen display instruction area 42. Display the cursor for more than a time, for example, for more than 3 seconds.

Next, the CPU 11 determines whether or not the cursor exists within the menu area 40 (5P4), and if the cursor exists outside the menu area 40, the process proceeds to SF3;
When the cursor exists within the menu area 40, it is determined whether the cursor exists within the previous screen display instruction area 41 (S
P5). As a result of this determination, if the cursor exists within the previous screen display instruction area 41, the CPU 11 sets a timer (5P6), and then determines whether the time T counted by the timer has exceeded 3 seconds (S P6). 7). As a result of this determination, if the clocked time T does not reach 3 seconds, the process moves to SF3, and if it exceeds 3 seconds, the data memory 1
2, and based on this data, write the data of the previous screen in an area other than the area corresponding to the menu area 40 of the frame memory 13, and
Then, the previous screen is projected (5P8), and the process moves to the process of SP2. At the start of image projection, the first image is about to be projected, so even if the front screen display is instructed, it will not work.

If the result of the determination in SP5 is that the cursor exists outside the previous screen display instruction area 41, it is determined whether the cursor exists within the next screen display instruction area 42 (SF3). As a result of this determination, if the cursor does not exist within the next screen display instruction area 42, the process shifts to the process of SP2. Also,
When the cursor is within the next screen display instruction area 42, the CPU 11 sets a timer (5 PIO), and then determines whether the time T counted by the timer has exceeded 3 seconds (SPII). As a result of this judgment, if the measured time T does not reach 3 seconds, the process moves to SF3, and if 3 seconds have passed, the data for the next screen is read from the data memory 12, and the corresponding frame is created based on this data. Write the image data to the address of memory 13 and project the next screen.
P12), proceed to the process of SP2. As a result, a first image (elephant) is projected from the color video projector 2 onto the projection surface 1a of the screen 1.

As described above, the designated position on the projection surface 1a designated by the speaker using the laser light generator 6, that is, the position of the infrared spot, is detected by the camera 3 and the spot position detection device 4. Furthermore, the projector control section 5
Processing corresponding to the instruction and placement on the projection plane la is performed. As a result, the speaker can see the image projected on the projection surface 1a,
That is, the projection screen can be easily switched while explaining text or figures using the laser beam generator 6.

Therefore, there is no need to interrupt the speech.

Further, as described above, it is also possible to superimpose characters, figures, etc. written in the cursor display and frame memory 13 into a video image from another video device.

Furthermore, by configuring the data memory 12 using an IC card, data can be created individually when projecting various projection images of a plurality of speakers.

In this embodiment, the camera 3 is provided with an optical filter that transmits only infrared rays to take an infrared image, but an infrared camera may also be used.

(Effects of the Invention) As described above, according to claim (1) of the present invention, an arbitrary position on a plane within a predetermined range is indicated by the indicating means. Further, the plane is photographed by a camera, and a signal corresponding to the photographed image is output. Furthermore, since the position indicated by the indicating means on the plane is detected by the position detecting means based on the signal output from the camera, even if the plane is a large screen, the shooting range by the camera can be detected. If you set it to the screen range,
It is possible to easily detect the position indicated by the indicating means.

According to claim (2), the position on the plane indicated by the indicating means is detected by the position detecting device, and based on the detected position within the processing instruction area by the position detecting device,
Since the control means performs a predetermined process corresponding to the processing instruction area and also controls the projection of images onto the plane by the projection means, the instruction means can instruct processes such as switching of projected images. Therefore, a speaker at a meeting or the like can switch the projected images by a series of instruction operations using the instruction means.

This has the advantage that it is possible to speak smoothly without interrupting the progress of the meeting.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a block diagram in one embodiment, FIG. 3 is a diagram showing addresses of an image memory in one embodiment, and FIG. 4 is a diagram showing an address of an image memory in one embodiment. A block diagram of a display control circuit, FIG. 5 is a schematic configuration diagram of a laser beam generator in one embodiment, FIG. 6 is a control flowchart of a spot position detection device in one embodiment, and FIG. 7 is a projector control in one embodiment. 3 is a control flow chart of the section. DESCRIPTION OF SYMBOLS 1...Screen, 2...Color video projector, 3...Camera, 4...Spot position detection device,
4a...Amplifier, 4b...A/D converter, 4C...
- Image memory, 4d... Control circuit, 5... Projector control section, 6... Laser light generator, 11... C,
PU, 12...Data memory, 13...Frame memory, 14...Overlay memory, 15...Camera interface, 16...Display control circuit, 21...
synchronous separation circuit, 22... signal conversion circuit, 23... clock generation circuit, 24... RGB processor, 25...
... mixer circuit, 30 ... housing, 31 ... injection port, 32 ... semiconductor laser, 33 ... lens, 34 ...
... Drive circuit, 35... Battery, 36... Power switch. Patent Applicant Wacom Co., Ltd. Agent Patent Attorney Yoshi 1) Sei Takashi
Figure 4 is a block diagram of the display control circuit in one embodiment of the display control circuit.

Claims (2)

[Claims] (1) An instruction means capable of indicating an arbitrary position on a plane within a predetermined range; a camera that photographs the plane and outputs a signal corresponding to the photographed image; and based on the signal output from the camera, A position detecting device comprising: a position detecting means for detecting a position indicated on the plane by the indicating means. (2) The position detecting device according to claim (1), a projection means for projecting an image onto the plane, and a processing instruction area for instructing a predetermined process to be assigned on the plane, and the processing by the position detecting device. An image display device comprising: a control unit that performs the predetermined process and controls image projection by the projection unit based on a position detection result within the designated area.