JP2003044222A - Presentation system and presentation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a presentation system capable of establishing safety, generating various complicated point shapes, and coping with a multi-screen. SOLUTION: This system is provided with a screen 10, a liquid crystal projector 1 for projecting an image on the screen 10, an area CCD 5 for photographing a pointer 3 gripped by a presenter, and a control arithmetic part 2. The control arithmetic part 2 calculates the vector of the pointer 3 photographed by the area CCD 5, and generates the point coordinates on the extended line of the pointer 3 of the image from the calculated vector of the pointer 3, and the liquid crystal projector 1 projects the point image on the point coordinates on the image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a presentation system which uses a projector such as a liquid crystal projector or the like to point to a screen, and more particularly to the development of a new pointer.

[0002]

2. Description of the Related Art When a presentation such as a lecture is given using a liquid crystal projector, a laser pointer that projects a laser beam to clearly indicate a point on a screen is often used. Such a laser pointer has drawbacks in that hand shake is largely reflected and it is difficult to stabilize the point, or erroneous projection of laser light causes the laser pointer to enter the eyes of the audience and pose a danger. Further, the shape of the point is limited to a simple shape such as a circle or a line, and it has not been possible to meet the demand for changing the shape of the point according to the preference of the user.

Therefore, various proposals have been made in the past for solving these problems. For example, JP-A-8-2861
According to Japanese Patent Publication No. 47 (1), a rotating disk having a plurality of refraction grids for refracting laser light is rotated by a drive motor, and the refraction grid is used to scan the laser light to make the shape of the point arbitrary. You can Further, as a safety measure, Japanese Patent Laid-Open No. 10-4228 (2)
, The laser light projection is automatically turned on according to the brightness of the laser light projection target (screen, etc.).
It has been proposed to turn on / off the laser light and project the laser light only when it is brighter than a certain threshold. In addition, Japanese Patent Laid-Open No.
Japanese Patent Publication No. 000-321530 (3) discloses a technique of detecting a vertical or horizontal angle and projecting a laser beam only when the angle is within a predetermined range.

[0004]

According to the laser pointer described in the above publication (1), since the number of parts is relatively large, the weight is heavy and it is difficult to reduce the size, and the laser pointer resists the moment generated by the rotating disk. It is not easy to use because it requires you to operate it. Also,
Although the shape of the point can be changed, it is difficult to increase the variation of the shape, and it is also difficult to convert the laser light into a complicated shape. On the other hand, the safety measures according to the above-mentioned gazettes (2) and (3) cannot be a fundamental measure because a laser beam is projected if a case where the device does not operate properly occurs. In addition, in any of the conventional technologies, if there is a demand for a large-scale presentation in which the same image is projected on multiple screens and simultaneously pointed to those screens, that is, a so-called multi-screen presentation, it is not possible to respond. There wasn't.

Therefore, an object of the present invention is to provide a presentation system capable of generating a variety of complex point shapes and establishing safety, as well as being compatible with multiple screens.

[0006]

A presentation system according to the present invention comprises a screen means, a projection means for projecting an image on the screen means, a photographing means for photographing an indicator stick held by a presenter, and a photographing means for photographing. The projection means projects the point image on the point coordinates on the image by computing the vector of the pointing rod, and calculating the point coordinates on the extension line of the pointing rod in the image from the computed vector of the pointing rod. It is characterized by doing.

In the above-mentioned presentation system, the point coordinates on the image are calculated from the vector of the pointing stick photographed by the photographing means, and the point image is projected at the point coordinates, so that the pointing stick can be pointed to the point on the image. By pointing, the point image can be projected at that point. Therefore, the presenter can naturally show an arbitrary place on the image. Further, in the above-mentioned presentation system, since the laser beam is not used, it is of course safe, and since the projection means projects the image and the point image,
The point image can be formed into an arbitrary shape, and the image data can be projected by a plurality of screen means by distributing the image data to a plurality of projection means, which makes it possible to support a multi-screen.

The presentation system of the present invention is
It can be used as follows. That is, in the presentation method of the present invention, a plurality of fiducial marks are projected from the projection means onto the screen means, and the photographing means photographs the state in which the axis of the pointing rod is directed toward the fiducial marks. Is stored as a reference vector, and based on the coordinates of the reference vector and the reference mark on the image, the point coordinates on the extension line of the pointing rod in the image are generated from the calculated vector of the pointing rod. I am trying.

The fiducial mark is an X whose origin is at the center of the image.
It is desirable to provide them on both sides of the origin on the X-axis and the Y-axis of the Y-coordinate in order to perform accurate calculations. The vector of the pointing rod is an angle with respect to a plane orthogonal to the optical axis when viewed from the photographing means, that is, an angle component φ in the depth direction,
It is composed of a vertical angle component θ. The vertical angle component θ appears as it is in the captured image captured by the capturing means. Further, the angle component φ in the depth direction can be calculated by the length of the pointing rod in the captured image. In this case, it is necessary to perform an initial setting in which a state in which the pointer is perpendicular to the image capturing means is captured and the length of the indicator is stored in the computing means.

Alternatively, the indicator rod is provided with a reference light emitting portion arranged on the hand side of the presenter and an indicator light emitting portion arranged on the tip side, and the indicator light emitting portion intersects (preferably orthogonal) the axis of the indicator rod. It may be divided into a first light emitting portion and a second light emitting portion in a plane. In this case, the calculation unit is
The pointer calculates the angle in the depth direction based on the difference in the amount of light received from the light emitting unit and the second light emitting unit. By using the calculation result of this method and the method of calculating the angle component φ in the depth direction from the length of the pointing rod described above, the accuracy of the calculation result can be improved.

It is convenient to provide an automatic tracking means for tracking the reference light emitting portion to change the direction of the photographing means. Further, the photographing means can be provided with an autofocus means for focusing on the reference light emitting portion, and further, by providing a zoom function, the length of the pointing rod photographed or the distance between the reference light emitting portion and the pointing light emitting portion is corrected. It may be done.

If the photographing means is provided with a lighting means for illuminating the presenter and the presenter is projected on the screen means, the presentation can be further enhanced. It should be noted that it is desirable that the light sources of the reference light emitting unit and the instruction light emitting unit emit infrared light because there is much noise when the visible light is photographed. Also,
In that case, a filter for cutting visible light may be provided in the photographing means, and the filter may be removed when photographing the presenter.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 and 2 are schematic diagrams showing the entire presentation system of the embodiment. In FIG. 1, reference numeral 1 is a liquid crystal projector (projection unit), and 2 is a control calculation unit (calculation unit) that outputs image data to the liquid crystal projector 1. LCD projector 1
Projects an image on a screen (screen means) 10 provided in front based on the image data input from the control calculation unit 2.

In the figure, reference numeral 3 is an indicator rod held by the presenter. At the tip of the indicator rod 3, the first light emitting unit 3
An instruction light emitting unit 30 including the first light emitting unit 32 and the second light emitting unit 32 is provided. The first light emitting unit 31 and the second light emitting unit 32 have a shape in which a sphere is halved on a plane orthogonal to the axis of the indicator rod, and an opaque member is provided between the two. The first light emitting unit 31 and the second light emitting unit 32 alternately blink to emit infrared light.

A reference light emitting portion 33 is provided at the base end portion of the pointing rod 3. The reference light emitting unit 33 has a spherical shape and emits infrared light when turned on. A portion closer to the base end than the reference light emitting portion 33 is a portion that the presenter grips, and a button 34 for operating blinking of the instruction light emitting portion 30 and lighting of the reference light emitting portion 33 is provided there. The reference light emitting unit 33 is also used for infrared communication. For example, page turning of the image projected on the screen 10 can be instructed by operating the button 34. It is also possible to use wireless communication instead of infrared communication.

When the reference light emitting portion 33 and the instruction light emitting portion 30 emit infrared light, they are emitted by the area CCD (photographing means) 5.
The captured image is input to the control calculation unit 2. In the figure, reference numeral 5 is an area CCD, and the area CCD
5 is equipped with a spotlight 50 in the vicinity thereof. Further, the area CCD 5 has an auto-focus means and a zoom function for automatically measuring a distance and focusing on the reference light emitting unit 33, and a reference light emitting unit when the reference light emitting unit 33 moves on a captured image. 33 is provided with a rotation mechanism for arranging 33 at a predetermined position on the captured image.

The control calculation unit 2 calculates the relative position between the reference light emitting unit 33 and the pointing light emitting unit 30, and calculates the vector of the pointing rod 3 from the calculated relative position. Then, the point coordinates on the extension line of the pointer 3 in the image are generated from the calculated vector V of the pointer 3, and the point image is combined with the point coordinates of the CRT image of the personal computer 4.

Next, the operation of the presentation system having the above configuration will be described. FIG. 3 is a diagram for explaining the initial setting, and FIG. 5 is a flowchart showing the operation of the embodiment. At the time of initial setting (step S1), the liquid crystal projector 1 projects the reference mark M on the screen 10 (step S11). Fiducial mark M
Are arranged at the center of the image projected on the screen 10 by the liquid crystal projector 1 and at the top, bottom, left and right side edges of the image, respectively, and are located on the XY coordinates with the center of the image as the origin.

Then, with the reference light emitting portion 33 and the pointing light emitting portion 30 emitting light, the reference mark M is moved by the pointing rod 3.
The area CCD 5 and the indicator rod 3 each time.
The reference light emitting unit 33 and the instruction light emitting unit 30 are photographed (step S12). FIG. 4B is a diagram showing a photographed image of the indicator rod 3 photographed by the area CCD 5. The control calculation unit 2 analyzes the image data input from the area CCD 5 and stores the reference vector when the pointing rod 3 points the reference mark M and the coordinates of the reference mark M in association with each other (step S13). .

Here, as shown in FIG. 4B, the vertical angle component θ forming the vector V of the indicator rod 3 appears in the photographed image photographed by the area CCD 5 as it is. Further, the angle formed by the plane orthogonal to the optical axis of the area CCD 5, that is, the angle component φ in the depth direction, is the ratio A _{2 of the} light amount received from the second light emitting unit 32 to the light amount received from the first light emitting unit 31 of the instruction light emitting unit 30. / A ₁ is required. As can be seen from FIG. 2, the first light emitting section 31 is shaded by the second light emitting section 32 due to the inclination angle of the indicator rod 3, and the amount of light received by the area CCD 5 from the first light emitting section 31 is reduced.

In this embodiment, the indicator rod 3 is placed in the area CC.
Inclining horizontally from the state orthogonal to the optical axis of D5,
At that time, the ratio A ₂ / A _{1 of the} amount of light received by the area CCD 5 from the first light emitting unit 31 and the second light emitting unit 32 and the inclination angle φ.
Is seeking the relationship with. FIG. 4A is a graph showing the relationship, and the control calculation unit 2 stores the graph as a calculation table. Therefore, when the control calculation unit 2 calculates the ratio A ₂ / A ₁ of the light amount, the result is shown in FIG.
The angle component φ of the pointing rod 3 in the depth direction is obtained by applying the calculation table shown in FIG.

Instead of or in addition to the above method, a method of calculating the angle component φ from the distance L between the reference light emitting section 33 and the pointing light emitting section 30 can be performed. In that case, while pointing the end portion of the screen 10 with the pointing rod 3, for example, the reference mark M at the left end shown in FIG. The actual length of the rod 3 needs to be stored in the control calculation unit 2.

The above is the operation of the initial setting in step S1. When the initial setting is completed, the control calculation unit 2 performs the following processing (step S2). First, the control calculation unit 2 obtains the vector V of the indicator rod 3 in the same procedure as described above (step S
21) Based on the stored reference vector and the coordinates of the reference mark M, the point coordinates on the image indicated by the vector V are generated (step S22).

On the other hand, the personal computer 4 outputs the data of the image displayed on the CRT to the control arithmetic unit 2. This data is image data that does not include the point image projected on the screen 10. Then, the control calculation unit 2 synthesizes a predetermined point image at the position of the point coordinates in the image (step S25). In this way, image data is generated. This image data is the liquid crystal projector 1
Output to the CR of the personal computer 4.
An image in which the point image is combined with the image displayed at T is projected on the screen 10 (step S3). As a result, the point image is projected on the image on the screen 10 at the position indicated by the pointing rod 3.

As described above, in the above presentation system, the point coordinates on the image are calculated from the vector V of the reference light emitting portion 33 and the instruction light emitting portion 30 photographed by the area CCD 5, and the point image is calculated at the point coordinates. Since the image is projected, by pointing the pointing rod 3 to the desired point on the image, the point image can be projected on that point. Therefore, the presenter can naturally show an arbitrary place on the image. Further, in the above-mentioned presentation system, not only is it safe because a laser beam is not used, but since image data in which point images are combined is generated,
The point image can be formed into an arbitrary shape, and the image data can be projected by a plurality of screen means by distributing the image data to a plurality of projection means, which makes it possible to support a multi-screen.

In particular, in the above embodiment, the indicator rod 3 is provided with the reference light emitting portion 33 and the instruction light emitting portion 30, and the instruction light emitting portion 30 is provided.
Is divided into the first light emitting portion 31 and the second light emitting portion 32, the angle component φ of the vector of the indicator rod 3 in the depth direction is based on the ratio of the amount of light received from the first light emitting portion and the second light emitting portion. Can be asked. Further, in the above-described embodiment, since the area CCD 5 is provided with the spotlight 50, the presenter can be projected on the screen 10 and the presentation can be further enhanced.

[0027]

As described above, according to the present invention,
Since the vector of the pointing rod photographed by the photographing means is calculated and the point coordinates on the extension line of the pointing rod in the image are generated from the calculated vector of the pointing rod, generation of complicated various point shapes and establishment of safety are, of course, established. Therefore, it is possible to obtain an effect such as being compatible with a multi-screen.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a presentation system according to an embodiment of the present invention.

FIG. 2 is a diagram showing an entire presentation system according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a vector of an indicator rod.

4A is a diagram showing the relationship between the ratio of the amount of light received by the area CCD and the angular component in the depth direction, and FIG. 4B is a diagram showing a photographed image photographed by the area CCD.

FIG. 5 is a flowchart showing the operation of the embodiment.

[Explanation of symbols]

1 Liquid crystal projector (projection means) 2 Control calculation unit (calculation means) 3 pointer 5 area CCD (imaging means) 10 screens (screen means) 30 Indicator light unit 31 First Light Emitting Unit 32 Second light emitting unit 33 Reference light emitting unit M standard mark

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09G 5/08 G09G 5/08 DL (72) Inventor Takashi Nagashima 1-324 Uetakecho, Saitama City Saitama Prefecture Fuji Photo Optical Co., Ltd. (72) Inventor Akinori Hamana 1-324 Uetakecho, Saitama City, Saitama Prefecture Fuji Photo Optical Co., Ltd. F-term (reference) 5B087 AA09 AB02 AD02 AE03 CC09 CC26 CC33 DD03 DE03 DE07 5C082 AA03 AA24 BA02 BA12 BB42 CA02 CA59 CB05 DA42 DA87 MM09 MM10

Claims (4)

[Claims] 1. A screen means, a projection means for projecting an image on the screen means, a photographing means for photographing a pointing rod held by a presenter, and a vector of the pointing rod photographed by the photographing means, and the calculation is performed. And a calculation means for generating point coordinates on the extension line of the pointing rod in the image from the vector of the pointing rod,
A presentation system characterized by projecting a point image on the point coordinates on the image. 2. The indicator rod includes a reference light emitting portion arranged on the hand side of the presenter and an instruction light emitting portion arranged on the tip side, and the indicator light emitting portion is a plane intersecting the axis of the indicator rod. Is divided into a first light emitting unit and a second light emitting unit, and the computing unit causes the indicator rod to set the optical axis of the photographing means based on the difference in the amount of light received from the first light emitting unit and the second light emitting unit. The presentation system according to claim 1, wherein an angle formed with respect to a plane orthogonal to is calculated. 3. The illuminating means for illuminating the presenter in the photographing means, and the presenter is projected on the screen means according to an operation.
Presentation system described in. 4. A presentation method using the presentation system according to claim 1, wherein a plurality of fiducial marks are projected from the projection means onto the screen means, and the axis line of the pointing rod is set to the above-mentioned. The state toward the fiducial mark is photographed by the photographing means, and the arithmetic means stores the vector of the pointing rod at that time as a reference vector, and the reference vector and the coordinates of the reference mark on the image are also stored. And a point coordinate on the extension line of the pointing rod in the image from the calculated vector of the pointing rod.