JP3914728B2 - Presentation system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a presentation system that makes a presentation using video projected from a projector.
[0002]
[Problems to be solved by the invention]
Today, presentations in meetings and the like often use images projected from a projector for the purpose of visual effects.
[0003]
In such a presentation, a presenter may be located between the projector and the screen.
[0004]
Of course, recently, since a laser pointer or the like is used, the frequency of the presenter being positioned between the projector and the screen is decreasing. However, even in such a case, if the presenter himself has poor vision, he will be close to the screen in order to see a detailed image projected on the screen. For this reason, the presenter is positioned between the projector and the screen.
[0005]
In such a case, the presenter gets dazzled because it receives light from the projector.
[0006]
In order to solve such a problem, in a projection type television receiver configured to project an image from a light source onto a screen via a projection optical system, a projection area from the projection optical system to the screen Detecting means for detecting the intrusion of the moving body into the vehicle, and control means for controlling the light output of the light source based on the detection output from the detection means, and the light output from the light source is reduced by the control means. Alternatively, a projection type television receiver characterized in that it is shielded has been proposed (Japanese Patent Laid-Open No. 4-111585).
[0007]
However, in this proposal, the detecting means for detecting the intrusion of the moving body (presenter) from the projection optical system to the projection area on the screen corresponds to the reflecting member provided on the left and right side surfaces of the screen and the reflecting member. The light emitting element is arranged on the projector side, so when the presenter crosses the screen, the light from the light emitting element is blocked by the presenter, so the light receiving element receives the light from the light emitting element. In such a case, the light output of the light source is merely reduced. In other words, the proposed one has the advantage that the glare is reduced for the presenter because the light output of the light source is reduced when the presenter is positioned between the projector and the screen. The video projected on the screen is difficult to see.
[0008]
Therefore, the problem to be solved by the present invention is to provide a presentation system in which when the presenter is positioned between the projector and the screen, the glare is reduced for the presenter and the video is not difficult for the audience. Is to provide.
[0009]
[Means for Solving the Problems]
The above-mentioned problem is a presentation system in which a presenter makes a presentation using an image projected on a screen from a projector,
A projector,
Photographing means for photographing the image projected on the screen;
Subtracting means for subtracting input data input to the projector from output data from the photographing means to obtain difference data corresponding to the shadow data of the presenter existing between the projector and the screen ;
Adding means for outputting addition data in which the brightness of light irradiated only to the presenter positioned between the projector and the screen is reduced by adding the difference data calculated by the subtracting means and the input data;
Control means for controlling the illumination of the projector so as to reduce the brightness of the light emitted only to the presenter using the addition data output from the addition means;
It is solved by the presentation system characterized by having .
[0011]
That is, in the present invention, when the presenter is positioned between the projector and the screen, the brightness of only the portion corresponding to the presenter is reduced. That is, the photographing means is provided and this photographing is performed. If the image on the screen projected by the projector is photographed by the means and the difference between the photographing data of the photographing means and the original data input to the projector is obtained by a subtractor or the like, the difference data is calculated between the projector and the screen. Input data that is input to the projector so that the brightness of only the portion corresponding to the presenter existing between the projector and the screen is reduced by using this difference data. Can be controlled by the control means, so that the above-mentioned problem can be solved.
[0012]
As a means for controlling so that the luminance of only the portion corresponding to the presenter existing between the projector and the screen is reduced, for example, the output data from the subtracting means and the input data are added, and this added data is displayed on the projector display. A method of inputting to the control means by the input means can be adopted. That is, when such a method is adopted, since there is predetermined data in a portion corresponding to the presenter existing between the projector and the screen, the luminance of this portion is consequently reduced.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 are diagrams for explaining an embodiment of a presentation system according to the present invention. FIG. 1 is a schematic diagram for explaining the outline of the present invention. FIG. 2 is a schematic diagram for explaining the present invention. FIG. 3 is a block diagram of the presentation system of the present invention.
[0014]
First, it demonstrates using FIG.
[0015]
As shown in FIG. 1, the presenter 3 makes a presentation using an image projected on the screen 2 from the projection type projector 1. Since this content is a well-known matter, details are omitted.
[0016]
By the way, as shown in FIG. 1, when the presenter 3 moves toward the center of the screen 2, the light from the projector 1 is irradiated to the presenter 3, and in some cases, the presenter 3 is dazzled. I feel very much.
[0017]
At this stage, if the light from the projector 1 is weakened, the glare is reduced. However, in accordance with this, the contrast of the entire image displayed on the screen 2 is weakened, and the audience (audience) behind the projector 1 becomes difficult to see the entire image of the screen 2.
[0018]
By the way, as can be seen from FIG. 1, when the presenter 3 in front of the screen 2 is irradiated with light, the presenter 3 feels dazzling, but not only that, but the shadow of the presenter 3 appears on the screen 2 behind it. Can be done.
[0019]
Therefore, if a camera (photographing means) 4 is provided in the projector 1 and the screen 2 is photographed by the camera 4, the photographing data output from the camera 4 (corresponding to the video data of (a) in FIG. 2). )) Is (data input to the projector 1 (corresponding to the video data of (b) in FIG. 2)) + (shadow data by the presenter 3)-(photographed data output from the camera 4)-( Data input to the projector 1) = (shadow data by the presenter 3 (corresponding to the video data of (c) in FIG. 2)).
[0020]
That is, the difference data is shadow data caused by the presenter 3 exposed to the light from the projector 1 (this results in the cause of glare).
[0021]
Therefore, by using this difference data, it is possible to reduce the luminance of light irradiated only to the presenter 3 while maintaining the luminance of the light that does not hit the presenter 3 as it is.
[0022]
That is, if a control means for reducing the luminance of only the portion corresponding to the presenter 3 by the above difference data is provided, when the presenter 3 is positioned between the projector 1 and the screen 2, only the portion corresponding to the presenter 3 is provided. The luminance is reduced.
[0023]
More specifically, as shown in FIG. 3, a subtraction circuit 5, a comparison circuit 6 and an addition circuit 7 are provided, and the subtraction circuit 5 (shooting data output from the camera 4 ((a in FIG. )) And (data input to the projector 1 (corresponding to the image data of FIG. 2B)) are input. Is zero (0) when the presenter 3 is not located between the projector 1 and the screen 2, but the presenter 3 is present when the presenter 3 is located between the projector 1 and the screen 2. The output data of the subtracting circuit 5 is expected to contain some noise, so that data less than a predetermined threshold value (noise amount) through the comparison circuit 6. Keep to be removed.
[0024]
Therefore, it is understood that the output data from the comparison circuit 6 is shadow data from the presenter 3.
[0025]
The output data of the comparison circuit 6 is input to the addition circuit 7. On the other hand, since the data input to the projector 1 is also input to the adder circuit 7, if the output from the comparison circuit 6 is not zero, the output data from the adder circuit 7 is (shadow data from the presenter 3). If the added data is input to the display control circuit 8 of the projection type projector 1 by the input means, the presenter 3 will not hit. The brightness of the light can be maintained as it is, and the brightness of the light applied only to the presenter 3 is reduced. In other words, the presenter 3 does not feel dazzling, and the audience (audience) can nevertheless see the video well.
[0026]
Further, if an alarm means is further provided so that a signal from the comparison circuit 6 is input, if the output value of the comparison circuit 6 is not zero, the presenter 3 or another person will be in the area of the screen 2. In case of intrusion, an alarm can be notified and attention can be urged.
[0027]
In the above embodiment, the case where the subtractor circuit or the adder circuit is used has been described. However, the output data of the subtractor circuit 5 is input to the gate circuit, and the original data input to the projector 1 corresponds to the presenter 3. Only the brightness may be lowered.
[0028]
【The invention's effect】
When the presenter is positioned between the projector and the screen, the glare is reduced for the presenter, and the image can be viewed well for the audience (audience), and is not difficult to see.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory diagram in a presentation. FIG. 2 is an explanatory diagram for explaining a main part of the present invention. FIG. 3 is a block diagram of a presentation system.
DESCRIPTION OF SYMBOLS 1 Projection type projector 2 Screen 3 Presenter 4 Camera 5 Subtraction circuit 6 Comparison circuit 7 Addition circuit

Claims (1)

A presentation system in which a presenter makes a presentation using an image projected on a screen from a projector,
A projector,
Photographing means for photographing the image projected on the screen;
Subtracting means for subtracting input data input to the projector from output data from the photographing means to obtain difference data corresponding to the shadow data of the presenter existing between the projector and the screen ;
Adding means for outputting addition data in which the brightness of light irradiated only to the presenter positioned between the projector and the screen is reduced by adding the difference data calculated by the subtracting means and the input data;
Control means for controlling the illumination of the projector so as to reduce the brightness of the light emitted only to the presenter using the addition data output from the addition means;
A presentation system comprising:

Images