JP2002244813A - System and method for image display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system for image display capable of easily discriminating the display of a plurality of indicated points on a projection screen and usable with more natural feeling. SOLUTION: Laser beams are irradiated by one or plural laser pointers 5 on the screen 4 where an image is projected, and each laser beam is detected by plural optical detectors 41 evenly disposed on the screen 4. A position detector 6 discriminates and detects the position on the projected image 4a of each irradiated laser beam. An information processor 2 produces a synthesized image formed by synthesizing indication images 4b displaying the indication by laser pointers 5, whose shape and color are different by each laser beam, and the synthesized image is outputted to a projector 3. In this way, the indication images 4b are synthesized and displayed at the irradiated positions of laser beams on the projected image 4a on the screen 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display system and an image display method for displaying an image by projecting the image on a screen.

[0002]

2. Description of the Related Art In recent years, in situations where lectures, presentations, conferences, and the like are performed, an electronic projector device connected to a computer has been used as a device for projecting an image on a relatively large screen that can be viewed by many viewers. Often used. The electronic projector device magnifies and projects an image generated on a computer using, for example, presentation software on a reflective or transmission screen using, for example, a liquid crystal display device.
In addition, when using such an electronic projector device, when the indicator points to a specific position on the projection screen, for example, a laser pointer is used. The laser pointer is a small laser emitting device in which a light emitting element of a laser is incorporated, for example, which is used by a pointer in a hand, and allows a viewer to directly visually recognize a light spot on a projected image by the emitted laser light. Confirms the indicated position.

[0003]

By the way, when an electronic projector is used in a conference or the like, it is conceivable that a plurality of instructors give instructions on a projection screen. When the above-described laser pointer is used, it is possible to identify the positions indicated by a plurality of pointers by using laser pointers that emit different colors of laser light. However, the light spot on the projection screen by the laser pointer is generally small, and in the case of similar colors, it is difficult to identify who is pointing to that point.

[0004] Further, since the designated point is displayed only while the laser beam is being emitted from the laser pointer, in order to designate a specific position, the pointer must be in a posture in which the laser emission port is directed to that position. Must-have. Furthermore, when displaying an image operated by a computer using software for presentation or the like,
Operations on the program interface displayed on the projection screen need to be performed by a mouse or keyboard connected to the computer, in which case the instructor is near this computer or another operator operates the computer There is a need.

[0005] As described above, a laser pointer is not always convenient for a person who gives a lecture or explanation using the electronic projector device, and also makes full use of software functions for presentation and the like. There were many issues in providing a more natural and easy-to-understand explanation.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and an image display system capable of easily identifying a plurality of designated points on a projection screen and using it with a more natural feeling. The purpose is to provide.

It is another object of the present invention to provide an image display method in which the display of a plurality of designated points on a projection screen can be easily identified, and can be used with a more natural feeling. .

[0008]

According to the present invention, in order to solve the above-mentioned problems, in an image display system for projecting and displaying an image, an image projecting means for projecting an image corresponding to input image data; One or more light emitting means for emitting light, a screen on which an image projected by the image projecting means is projected, and a plurality of light rays uniformly provided on a projection surface of the screen to detect irradiation of the light rays Detecting means, a detection signal from the plurality of light beam detection means, a position detection means for detecting the irradiation position of the light beam on the projection image, based on a detection signal by the position detection means, based on the detection signal on the projection image Image data generating means for generating data of a synthesized image obtained by synthesizing an instruction image indicating an instruction by the light beam at a corresponding position and outputting the data to the image projecting means. Image display system characterized in that it is are provided.

[0009] In such an image display system, a light beam irradiated on the screen by the light beam emitting means is detected by a plurality of light beam detecting means uniformly provided on the screen on which the image is projected. The position detecting means detects the irradiation position of the light beam on the projection image based on the position. The image data generating means generates data of a composite image obtained by synthesizing an instruction image indicating an instruction on the projected image by irradiation of light rays with a corresponding position on the projected image based on a detection signal of the position detecting means. Output to projection means. Thereby, the instruction image is displayed at the irradiation position of the light beam on the projection image, and the irradiation position by the light beam can be easily visually recognized.

Further, the position detecting means identifies the detection signal of each light beam from the light beam emitting means, for example, by a method in which a plurality of light beam emitting means emit light beams having different modulation frequencies. By synthesizing and outputting an instruction image having a different shape or color at the irradiation position of each light ray based on this identification, when a plurality of instructors irradiate the light rays using the light emitting means on the projection screen Thus, it is possible to clearly identify the irradiation position by each of the instructors.

According to the present invention, in an image display method for displaying an image by projecting the image on a screen, one or more light beams are irradiated on the screen on which the image is projected,
The light beam is detected by a plurality of photodetectors uniformly provided on the screen, and an irradiation position on a projected image of the screen is identified and detected for each light beam,
Based on the detection signal of the irradiation position, at a corresponding position on the projected image, indicating an instruction by each of the light beams, to generate a composite image in which an instruction image having a different shape or color for each of the light beams is synthesized. An image display method is provided, wherein the image is projected on a screen.

In such an image display method, an irradiation position on a projection image of a light beam irradiated on the screen is detected by detection signals from a plurality of photodetectors uniformly provided on the screen on which the image is projected. I do. When a plurality of light beams are emitted, each light beam detected by the photodetector is identified by, for example, a method in which each light beam has a different modulation frequency. Based on the detection signal of the irradiation position identified by each light beam in this way, the instruction image indicating the instruction on the projection image by the irradiation of the light beam is synthesized at each corresponding position on the projection image, and this synthesized image is projected on the screen. By doing so, the instruction image is displayed at the irradiation position of the light beam on the projection image, and the irradiation position by the light beam can be easily visually recognized, and the instruction image to be synthesized has a different shape or color for each light beam. An instruction image having a different display state is displayed for each light ray on the upper side, and it becomes possible to clearly identify the irradiation positions of the light rays by a plurality of instructors.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 shows a schematic configuration example of an image display system of the present invention.

An image display system 1 shown in FIG. 1 is a system for enabling a plurality of viewers to visually recognize an image by displaying an image on a relatively large screen, for example, in a lecture, a presentation, or a conference. An information processing device 2 that generates and outputs the data of the projector, a projector 3 that projects an image according to the input data, and a projection image 4a is displayed on the front surface, and a plurality of photodetectors 41 are displayed on the projection surface. The screen 4 is provided with a laser pointer 5 for emitting a laser beam, and a position detecting device 6 for detecting an irradiation position of the laser beam on the screen 4.

The information processing device 2 has a CPU (Central Proc).
essing Unit) and processors for image processing, semiconductor ROM (Read Only Memory) and RAM (Random Acc)
essMemory), a hard disk drive, a computer device such as a personal computer having an interface for data transmission / reception, and an image generation program such as presentation software or CAD (Computer Aided Design) software stored on the hard disk. , Functions as image data output means for generating data of the projection image 4 a by being executed by the CPU, and controls the image projection operation of the projector 3. The projector 3 includes, for example, an illumination source, a lens, and an optical system including an LCD (Liquid Crystal Display) panel and the like. The LCD panel transmits illumination light from the back based on image data supplied from the information processing device 2. Is an image projection unit that generates a projection image 4a by controlling The projector 3 uses, for example, a color filter, a plurality of LCD panels, and the like to perform RGB (Red, Green, Blu-
By providing an optical system for controlling the transmission of light corresponding to each of e), a color image can be projected.
The screen 4 displays the projection image 4a to the viewer by reflecting the projection image 4a from the projector 3 on the flat front surface. The information processing device 2, the projector 3, and the screen 4 constitute a so-called front-reflection type electronic projector device.

The laser pointer 5 is an example of a light emitting unit that includes a laser light emitting element and a lens and emits a laser beam, and is used when pointing to a specific position in an image displayed on the screen 4. Then, a spot of a laser beam is formed on the illuminated screen 4 by, for example, holding the indicator in a hand. In order to detect the laser beam irradiated on the screen 4 in this manner, a plurality of photodetectors such as photodiodes made of a semiconductor material, for example, are arranged in a matrix or the like on the image projection surface on the screen 4. They are arranged uniformly. The position detecting device 6 is a position detecting means that is electrically connected to the plurality of photodetectors and detects an irradiation position of the laser beam on the screen 4 based on a detection signal from each of the photodetectors. The detection signal is supplied to the information processing device 2.

FIG. 2 is an enlarged view of the image projection surface of the screen 4. FIG. 2 shows an arrangement example of the photodetector 41 on the image projection surface of the screen 4. The front of the screen 4 is a projection image 4 from the projector 3.
In order to satisfactorily reproduce “a”, for example, it is made white or a color close thereto by being formed of a cloth or a resin material or by being subjected to aluminum evaporation. The photodetector 41 is, for example, a photodiode or the like, and is uniformly arranged on the entire surface of the screen 4 in a matrix, for example, as shown in FIG. 2, and is fixed by bonding, fitting into a fitting hole, or the like. You.

Incidentally, since the light detecting surface of the light detector 41 such as a photodiode generally has a dark color, when the light detecting surface is provided on the surface of the screen 4, the size, the number, and the arrangement of the light detector 41 are increased. The display quality of the projection image 4a may be deteriorated due to the interval or the like. For this reason, it is desirable that the area occupied by the photodetector 41 on the screen 4 is small. Specifically, it is desirable that the area of the photodetector 41 be 1/10 or less of the area of the screen 4. Also,
It is desirable that the smaller the resolution of the projection image 4a, the smaller the area of the photodetector 41.

Further, the distance between the photodetectors 41 is increased,
As the number of the photodetectors 41 to be arranged is smaller, the cost of the screen 4 can be suppressed. On the other hand, the light receiving area of the photodetector 41 needs to be large enough for the output current photoelectrically converted by receiving the laser beam to identify the irradiation position. For example, FIG. 2 shows a spot 4c formed by irradiation of a laser beam, but in order for these photodetectors 41 to always detect the irradiation of the laser beam on the screen 4, an adjacent photodetector must be used. It is necessary to make the interval between 41 smaller than the diameter of the spot 4c of the laser beam. The diameter of the spot 4c by the general laser pointer 5 is several millimeters, but the interval between the photodetectors 41 is desirably, for example, 1/2 or less of this diameter.
In order to increase the interval between the photodetectors 41,
A method of enlarging the spot 4c by the laser beam is conceivable. However, since the irradiation amount of the laser beam becomes smaller as the spot 4c becomes larger, the photodetector 41 having higher conversion performance is required. Further, since the size of the spot 4c changes depending on the distance between the screen 4 and the laser pointer 5 and the irradiation angle, the screen 4 and the photodetector 41 also depend on the environment in which the image display system 1 is used.
The requirements for the design of a device vary. In the image display system 1 of the present invention, in consideration of the above conditions, the size and performance of the photodetector 41 are set so as to minimize the deterioration of the display quality of the projection image 4a by the projector 3 and to suppress the cost. It is desirable to set arrangement intervals and the like.

Hereinafter, description will be made returning to FIG. As described above, the position detection device 6 detects the irradiation position of the laser beam on the screen 4 based on the detection signal from the photodetector 41. When the information processing device 2 receives the detection signal of the irradiation position from the position detection device 6, the information processing device 2 generates an instruction image 4 b for indicating that the information is pointed by the laser pointer 5 on the projection image 4 a of the screen 4 and performs projection. The combined image data obtained by combining the instruction image 4b with the corresponding position on the image 4a is output to the projector 3. As a result, the pointing image 4b is displayed at the position indicated by the pointer using the laser pointer 5 on the screen 4, and the pointing image 4b is moved and displayed on the screen together with the movement of the pointing position of the laser beam by the pointer. You. Also,
As the instruction image 4b, for example, a shape such as an arrow can be considered, but the size and shape that can be clearly recognized according to the size of the screen 4, the distance between the viewer and the screen 4, the color tone of the original projected image, and the like. Color.

FIG. 3 shows a schematic configuration example of a signal processing system in the information processing device 2 and the position detecting device 6. The position detecting device 6 includes a light detector 4 provided on the screen 4.
An amplifier 61 for amplifying detection signals from photodiodes 41a, 41b and 41c, a binarization circuit 62 for binarizing the amplified signal, and a binarization circuit An arithmetic circuit 63 for calculating position information and the like from the signal thus obtained, and an interface 64 for transmitting data to the information processing device 2. Note that a large number of the photodiodes 41a, 41b and 41c are actually arranged on the screen 4. Further, depending on the structure of the light detector 41, the position detection device 6 may include a power supply circuit that supplies a drive power to the light detector 41. On the other hand, the information processing device 2 includes a CPU 21 that controls the device, a ROM 22 storing programs and data for control, a RAM 23 used as a work area when the CPU 21 operates, various programs and data. A hard disk drive (hereinafter abbreviated as HDD) 24 as an external storage device in which
An image processing circuit 25 for performing processing such as reading and synthesizing image data stored in the DD 24 and the like, and interfaces 26 and 27 for transmitting and receiving data to and from the position detection device 6 and the projector 3 respectively.

In the position detecting device 6, the PDs 41a, 41b
The detection signal by the light irradiation from 41 and 41c etc. is amplified by the amplifier 61, converted into digital data by the binarization circuit 62, and the arithmetic circuit 63 calculates the position information of the light irradiation on the screen 4, such as coordinate information, for example. The data is output to the information processing device 2 via the interface 64. In the information processing device 2, the HDD 2
Under the control of the CPU 21 by executing an image display program such as presentation software stored in the HDD 4, predetermined image data stored in the HDD 24 is read and output to the projector 3. Further, based on the position information by the irradiation of the laser beam output from the position detecting device 6, the data of the predetermined instruction image 4b is read out from the HDD 24 and synthesized with the position corresponding to the position information on the original projection image 4a. The data of the composite image is output to the projector 3. The operation of the information processing device 2 controls the image projection operation of the projector 3.

FIG. 4 is a flowchart showing the control of the projection operation of the projection image 4a by the information processing apparatus 2 and the process of synthesizing the instruction image 4b. In step S401,
In the information processing device 2, an image display program is executed by the CPU 21, and based on an input operation command from an operation input device (not shown), data of a predetermined projection image 4 a stored in the HDD 24 is read, and the interface 27 is read. Output to the projector 3 via the By the output of the image data, the projector 4 is displayed on the screen 4.
Is displayed. In step S402, the information processing device 2 monitors an output signal from the position detection device 6 via the interface 26,
When a laser beam is irradiated on the screen 4 by the laser pointer 5 and a signal indicating position information corresponding to the irradiation position is received from the position detection device 6, the process proceeds to step S403.

In step S403, the data of the predetermined instruction image 4b stored in the HDD 24 is read and supplied to the image processing circuit 25. In step S404, the image processing circuit 25 is controlled to set the designated image 4b at a predetermined position on the projection image 4a in accordance with the received position information.
Is performed. Step S40
In 5, the generated composite image data is output to the projector 3 via the interface 27. Thereby, the instruction image 4b is displayed on the screen 4 at the irradiation position of the laser beam on the projection image 4a, and the position indicated by the instructor using the laser pointer 5 can be clearly recognized.

In the image display system 1, when a plurality of instructors point on the projection image 4a, instruction images having different display states such as shapes, sizes, colors, etc. are displayed at the irradiation positions. It is possible to clearly identify the irradiation position for each person. In order to realize such a function, for example, a plurality of laser pointers 5 emit light beams having different physical characteristics such as having different modulation frequencies, and the position detecting device 6 detects light. Each irradiation position is identified by detecting a difference in the properties of each light beam from the detection signal from the detector 41.

Here, FIG. 5 schematically shows a state in which a plurality of instructors point on the projection image 4a. FIG. 5 schematically shows a state where the user points on the projection image 4a using the two laser pointers 5a and 5b. The laser pointers 5a and 5b emit laser beams having different modulation frequencies. The position detecting device 6 receives the detection signal from the photodetector 41 by the irradiation of each laser beam, and
The difference of the modulation frequency is identified by the calculation of 3, and the position information of each irradiation position is individually calculated, and the identification information is added thereto and output to the information processing device 2. Further, for example, laser beams of different colors are emitted to the respective laser pointers 5a and 5b, and the photodetector 41 having wavelength selectivity is provided.
, The laser beam may be received to identify the irradiation position of each laser beam.

The information processing device 2 uses the laser pointers 5a and 5b based on the identification information from the position detecting device 6.
Are combined with instruction images 4d and 4e having different display states such as shapes, sizes, colors, etc.
To be projected. The number of laser pointers 5 that can be used at the same time is arbitrarily determined according to the processing performance of the position detection device 6 and the information processing device 2, and an instruction image having a different display state may be generated according to the number. In FIG. 5, two instruction images 4d displayed on the projection image 4a by such processing
As examples of 4e and 4e, arrow-shaped images having different shapes are shown. The display of the instruction images 4d and 4e enables the viewer of the screen 4 to clearly identify the irradiation position by the plurality of laser pointers 5 for each of the instructors. The discussion can smoothly proceed while watching the projection image 4a.

Further, when an instruction operation is performed on the projection image 4a by the instructor, for example, it is conceivable to emphasize that the instructor points to a specific position. In such a case, the instruction image 4b displayed at the designated position
However, by continuing to display the image as a residual image for a certain period of time as well as during the instruction, it is possible to make the indicated position stand out. In order to realize such a function in the image display device of the present invention, in the information processing device 2,
When the position information is received from the position detection device 6, a process of continuing to combine the instruction image 4b with the corresponding position on the projection image 4a for a predetermined time may be performed.

In this case, for example, if the pointer stops the irradiation of the laser beam by the laser pointer 5 while the instruction image 4b is displayed on the projection image 4a, the instruction image 4b does not disappear immediately and a predetermined time has elapsed. Until you continue to be displayed in the same place. Therefore, for example, the instructor sets the projected image 4
The pointing operation by the laser pointer 5 can be stopped while pointing to a specific position on a, and the body direction can be directed to the listener, and a natural explanation operation can be performed. Also, if the designated position is gradually changed during the display of the designated image 4b, an effect of displaying the moved locus of the designated image 4b is produced. For example, when the irradiation position of the laser beam is moved in a circular shape, the projected image is displayed. The state where the circular locus of the instruction image 4b is continuously displayed on the instruction image 4b is maintained, and effects such as emphasizing the inside of the locus of the locus can be produced.

In order to keep displaying the pointing image 4b at a certain position for a certain period of time as described above, for example,
When the value of the position information changes due to the irradiation of the laser beam, the display control is performed by the information processing device 2 so that the instruction image 4b displayed at this time is kept displayed at the original position for a certain period of time. Is also good. In this case, for example, when the irradiation position of the laser beam starts moving from a state where the irradiation position of the laser beam is stationary at a certain position on the screen 4, the instruction image 4b is kept displayed at the stationary position for a certain period of time. In this state, the pointer stops the pointing operation by the laser pointer 5 while the specific position on the projection image 4a is pointed, and the body can be directed toward the listener in the direction of the body. .

By the way, when the projection image 4a includes a graphical interface for performing a selection operation for a program operation, conventionally, for example, the instructor of the projection image 4a or another operator is required to operate the information processing apparatus. It is necessary to perform a selection operation by operating input means such as a mouse pointer connected to the device 2. On the other hand, in the image display system 1 of the present invention, the selection operation is performed by the pointer using the laser pointer 5 to perform the selection operation on the projected selection image of the program operation. The presentation can be made more natural without interrupting the flow of the process. In this case, the information processing apparatus 2 displays a selection image for performing a program operation such as a screen switching or a reproduction operation of a sound or a moving image on the projection image 4a, and irradiates the projection image 4a with a laser beam. When the position matches the display position of the selected image, it is determined that the operation of the program operation has been selected, and the selected program operation is executed. As the selected image, for example, an image called an icon indicating an operation switch image for a program operation, an underlined character information indicating a link to the next screen, or the like is used.

FIG. 6 shows an example of a projected image including a selected image for such a program operation, and FIG. 7 shows an example of a projected image after the display is switched by selecting the selected image. The transition of the screen by the selection operation of the program operation will be specifically described.

In FIG. 6, as an example including the graphical interface of the program operation, a projected image 4 displaying a graph showing the annual sales of the product A in the Kanto area.
2, selected images 42a, 42b, 42c, 42d, and 4 which are icons for shifting to the display of a graph for each prefecture.
2e, 42f and 42g are displayed. In addition, an arrow-shaped pointing image 4 is displayed at a pointing point by the laser pointer 5.
2h is displayed. At the time of displaying the projection image 42, the pointing image 42h is moved by the operation of the laser pointer 5 by the pointer, and as shown by the dotted line in the figure, for example, on the selected image 42a displayed as "Tokyo", When the designated position of the designated image 42h is superimposed, the display of the next screen representing a detailed graph of Tokyo is switched by the processing of the information processing device 2.

A screen after such display switching is performed is a projection image 43 shown in FIG. 7, and this image shows a graph indicating the annual sales of the product A in Tokyo. The instructor can continue the explanation while using the projection image 43 and moving the instruction image 43a with the laser pointer 5. Further, in the projected image 43, a selection image 43b for switching to the display of the original screen, that is, the projection image 42 in FIG. 6, is displayed. By moving the pointing image 43a, the pointing position is displayed on the selected image 43b. When overlapped, the display can be switched to the original screen. Thus, the instruction image 4 using the laser pointer 5
By performing the selection operation of the program operation in accordance with the instruction of the selection image by 3a, the speaker can perform the natural operation one after another without operating the input means such as the mouse pointer connected to the information processing apparatus 2, for example. It is possible to continue the lecture by changing the display.

FIG. 8 shows a flowchart of the processing of the information processing apparatus 2 in the selection operation of the program operation based on such an instruction on the projection image. In step S801, the information processing device 2 reads out the data of the projection image 42 stored in the HDD 24 and outputs the data to the projector 3. In step S802, in response to receiving the position information from the position detection device 6, the data of the instruction image 42h is read from the HDD 24 and supplied to the image processing circuit 25, and based on the position information, the corresponding position in the projection image 42 is determined. With the instruction image 42h, and outputs the data of the generated composite image to the projector 3. Thus, the instruction image 42h is displayed on the screen 4 together with the projection image 42 at the position indicated by the laser pointer 5.

In step S803, the position information output from the position detecting device 6 is monitored, and this position information is
If, for example, the information indicates the display position of the selected image 42a in the projection image 42, it is determined that the program operation indicated by the selected image 42a has been selected, and the process proceeds to step S804. In this step S803, the selection of the program operation may be determined when the coordinate value within the predetermined range where the selected image 42a is displayed matches the position information indicated by the laser pointer 5a. In step S804, the data of the projection image 43 to be displayed next is stored in the HDD2.
4 and supplied to the image processing circuit 25. In step S805, the instruction image 43b is combined with the position corresponding to the position information on the projection image 43 by the processing of the image processing circuit 25, and the combined image is output to the projector 3. As a result, the display on the screen 4 is switched, and the instructor selects the selected image 42 using the laser pointer 5.
The display screen switching operation can be performed only by the instruction of “a”.

In the above-described operation of selecting a program operation, the selected program operation is executed at the moment when the selected image is designated. In order to make the laser pointer 5 closer to the operation feeling when using the means, the laser pointer 5 is provided with a selection input means such as a button switch, and this selection input operation enables the same selection operation as a so-called click operation with a mouse. Good.

In this case, the laser pointer 5 has, for example, a button switch, and when the button switch is pressed, the physical frequency of the emitted light is changed such that the modulation frequency of the emitted laser beam is changed or the wavelength of the laser beam is changed. By adding the function of changing the physical characteristics, it becomes possible for the position detecting device 6 to identify the difference in the physical characteristics of the detection light due to the operation of such a button switch. That is, for example, the instructor of the projection image 42 operates the laser pointer 5 so that the instruction image 42h overlaps the selection image 42a, and at this time, presses a button switch of the laser pointer 5 to execute the program operation indicated by the selection image 42a. Perform a selection operation for. The information processing device 2
The position information on the screen 4 of the instruction image 4b supplied from the position detection device 6 matches the display position of the selected image 42a, and in this state, the physical characteristics of the laser light emitted from the position detection device 6 change. When a detection signal is supplied, the selection image 42a is selected and operated, such as recognizing that the click operation has been performed by the instructor and performing a control operation of displaying the projection image 43 shown below. Execute the intended program operation.

When the laser pointer 5 is provided with the selection input means as described above, not only the input operation similar to the click operation by the mouse but also the selected image is moved in the selected state and the predetermined program is moved. It is also possible to perform an input operation similar to a so-called drag operation and drop operation for executing an operation. Further, the laser pointer 5
Even when no selection input means is provided, the same operation as a so-called double-click operation using a mouse can be performed by, for example, an operation such as quickly switching on and off the emission of the laser beam from the laser pointer 5. By the operation, the selection operation of the program operation can be performed in the same manner as above. As described above, by making it possible to perform the same operation input as the operation of the mouse using the laser pointer 5, for those who give a lecture or explanation while instructing the screen 4, the operability to select is improved. Thereby, the degree of freedom for the configuration and operation of the image displayed on the screen 4 is increased, and the understanding of the viewer can be improved.

In the above embodiment, the present invention has been described as applied to a front-reflection type electronic projector apparatus which reflects a projected image from the projector 3 on the front surface of the screen 4 for display. Projector 3
Is reflected by a reflector provided at the rear of the screen 4 and transmitted through the screen 4 for display.
The present invention is also applicable to a rear-reflection type electronic projector generally called a rear projector. Also,
Although the function of detecting the irradiation position of the laser beam from the detection signal from the photodetector 41 is provided as an independent device as the position detecting device 6, this function may be realized in the information processing device 2.

[0041]

As described above, in the image display system according to the present invention, the light beam radiated on the screen by the light beam emitting means is converted into a plurality of light beam detecting means uniformly provided on the screen on which the image is projected. And the position detecting means detects the irradiation position of the light beam on the projection image based on the detection signal. The image data generating means generates data of a composite image obtained by synthesizing an instruction image indicating an instruction on the projected image by irradiation of light rays with a corresponding position on the projected image based on a detection signal of the position detecting means. Output to projection means. Thereby, the instruction image is displayed at the irradiation position of the light beam on the projection image, and the irradiation position by the light beam can be easily visually recognized.

Further, the position detecting means identifies the detection signal of each light beam from the light emitting means, for example, by a method in which a plurality of light emitting means emits light rays having different modulation frequencies, and the image data generating means. By synthesizing and outputting an instruction image having a different shape or color at the irradiation position of each light ray based on this identification, when a plurality of instructors irradiate light rays using a light emitting means on a projection screen, It is possible to clearly identify the irradiation position of each indicator.

Further, in the image display method of the present invention, the irradiation position on the projected image of the light beam illuminated on the screen is determined by the detection signals from the plurality of photodetectors uniformly provided on the screen on which the image is projected. Is detected. Also,
When a plurality of light beams are irradiated, each light beam detected by the photodetector is identified by, for example, a method in which each light beam has a different modulation frequency. Based on the detection signal of the irradiation position identified by each light beam in this way, the instruction image indicating the instruction on the projection image by the irradiation of the light beam is synthesized at each corresponding position on the projection image, and this synthesized image is projected on the screen. By doing so, the indication image is displayed at the irradiation position of the light beam on the projection image, and the irradiation position by the light beam can be easily visually recognized, and the indication image to be synthesized has a different shape or color for each light beam, so that the projection image is displayed. An instruction image having a different display state is displayed for each light ray on the upper side, and it becomes possible to clearly identify the irradiation positions of the light rays by a plurality of instructors.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration example of an image display system of the present invention.

FIG. 2 is an enlarged view of an image projection surface of a screen.

FIG. 3 shows a schematic configuration example of a signal processing system in the information processing device and the position detection device.

FIG. 4 is a flowchart illustrating projection operation control of a projection image and synthesis processing of an instruction image by the information processing apparatus.

FIG. 5 is a diagram schematically illustrating a state in which a plurality of instructors indicate an image on a projection image.

FIG. 6 is a diagram illustrating an example of a projection image including a selection image for a program operation.

FIG. 7 is a diagram illustrating an example of a projection image after a display is switched by selection of a selection image.

FIG. 8 is a flowchart illustrating a process of the information processing apparatus in a selection operation of a program operation according to an instruction on a projection image.

[Explanation of symbols]

1. Image display system 2. Information processing device 3.
Projector, 4 screen, 4a projected image,
4b ... Instruction image, 5 ... Laser pointer, 6 ... Position detecting device, 41 ... Photodetector

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5B068 AA05 AA11 AA22 AA36 BB18 BC03 BC07 BD02 BD09 BD25 BE06 CC11 CD05 5B087 AA09 AB09 AB14 AE00 BC03 BC32 CC09 CC26 CC33 DD06 DE07 DJ03 5E501 AC37 BA05 CA10 CB20 FA02 FB28

Claims (8)

[Claims] 1. An image display system for projecting and displaying an image, comprising: an image projecting means for projecting an image corresponding to input image data; one or more light emitting means for emitting light; A screen on which an image projected by the projection unit is projected; a plurality of light beam detection units uniformly provided on a projection surface of the screen to detect the irradiation of the light beam; and a detection signal from the plurality of light beam detection units. A position detection unit that detects an irradiation position of the light beam on the projection image; and an instruction image indicating an instruction by the light beam at a corresponding position on the projection image based on a detection signal from the position detection unit. Image data generating means for generating data of the composite image and outputting the data to the image projecting means. 2. The image display system according to claim 1, wherein said light beam is a laser beam. 3. The position detecting means identifies each of the light beams from the plurality of light emitting means based on a detection signal from the light detecting means, and the image data generating means performs the irradiation with the identified light rays. 2. The image display system according to claim 1, wherein the instruction images having different shapes or colors at respective positions are synthesized. 4. A plurality of the light beam emitting units emit the light beams having different modulation frequencies, respectively, and the position detecting unit detects the modulation frequency from each detection signal for the plurality of light beams by the light beam detecting unit. The image display system according to claim 3, wherein each of the detection signals is identified by performing the operation. 5. The apparatus according to claim 1, wherein the image data generating unit combines the designated image with the same position in the projection image for a certain period of time after receiving a detection signal from the position detecting unit at the irradiation position. The image display system according to claim 1. 6. The image data generating means includes a selection image for selecting an operation of a program in the projection image, and when the irradiation position of the light beam matches the display position of the selection image, 2. The image display system according to claim 1, wherein it is determined that an operation of the program is selected. 7. The light beam detecting means includes a selection input means for performing an input operation by a user, and emits light beams having different modulation frequencies in accordance with an input from the selection input means. Detects a change in the modulation frequency of the light beam from the light beam emitting unit from a detection signal by the light beam detecting unit, and the image data generating unit determines that the irradiation position of the light beam and the display position of the selected image are different. 2. The image display system according to claim 1, wherein when the position coincides with each other and a change in the modulation frequency of the light beam is detected by the position detection unit, it is determined that the operation of the program is selected. 8. An image display method for projecting and displaying an image on a screen, the method comprising: irradiating one or more light beams on the screen on which the image is projected; Detecting the light beam by a photodetector, identifying and detecting the irradiation position on the projection image of the screen for each light beam, based on the detection signal of the irradiation position, to a corresponding position on the projection image An image display method, comprising: generating a composite image obtained by composing an instruction image having a different shape or color for each light beam, which indicates an instruction by each light beam, and projecting the synthesized image on the screen.