JP2008242087A - Installation position adjustment system for front projection type projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an installation position adjustment system for a front projection type projector for installing a projector at a position right in front of a screen without deteriorating a display image. <P>SOLUTION: The frame of a screen in an image in front of the projector acquired by an imaging part is recognized, and the positional relationship between the projector and the screen is detected from the shape of the frame at a control part. From the information on the positional relationship, the way to move the projector for putting it right in front of the screen is acquired, and imaging of the information on the way to move the projector is performed, and the information is displayed in the projection image of the projector. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to installation of a front projection projector (projection image display device).

  As front-projection projectors (hereinafter, also simply referred to as “projectors”) become more sophisticated and less expensive, opportunities and places where the projectors are used are expanding. In addition, since it has become possible to increase the brightness of projectors and to reduce the size and weight thereof, the number of scenes in which projectors are carried and presentations are increasing. However, if the projector is installed without facing the screen, the projected image will be distorted, but it is difficult to quickly install the projector at the optimal position, so the image is often distorted. The current situation is that it is projected as it is.

In order to solve these problems, when the projector is installed at a location outside the position facing the screen, the image projected on the screen is corrected by correcting the distorted image. There is also technology. However, since the setting takes time, the technique is rarely used. The technique disclosed in Patent Document 1 is a system that easily corrects an image that has been difficult in the past in a short time by automating the correction of the image.
Patent Publication 2005-318652

  However, in the case of the technique described in Patent Document 1, it is possible to correct an image in a short time, but in order to correct a distorted image, the projector is projected from a position facing the screen. Compared to the above, an image has to be displayed with a small number of pixels, and the image quality deteriorates.

Here, degradation of image quality due to distortion correction will be described with reference to FIG.
An image projected from a projector installed at a position facing the screen is displayed without distortion as shown in FIG. However, when projected from an oblique direction with respect to the screen, the image is stretched at a portion far from the projector, and the entire image is distorted as shown in FIG. In such a case, the distortion correction function eliminates the distortion of the image by reducing the display as shown in FIG. However, since the number of used pixels decreases, the image quality deteriorates.

  On the other hand, if the projector can be installed at a position facing the screen, an image without distortion is projected on the screen, and thus the above problem does not occur. However, since the screen and the projector are usually installed at a distance of several meters, it is difficult to install the projector with the screen facing the screen in a short time.

  The present invention has been made to solve such problems of the prior art, and the installation position adjustment of the front projection projector for easily installing the projector at a position directly facing the screen without degrading the displayed image. To provide a system.

  In order to achieve the above object, an installation position adjusting system for a front projection projector according to the present invention is provided with a front projection projector including a front projection projector and a screen for projecting an image projected from the front projection projector. In the position adjustment system, the front projection type projector has a light source and projects an image, a projection lens unit for projecting an image projected from the image projection unit onto the screen, and An imaging unit that images a screen, a screen recognition unit that recognizes the shape of the screen by analyzing an image captured by the imaging unit, and the front surface based on the shape of the screen detected by the screen recognition unit When the projection projector is moved or rotated, the front projection projector And the front projection type based on the information transmitted from the control unit and the control unit that outputs information related to the determination. An installation support image creating unit that creates a screen for supporting whether the projector is moved or rotated is provided.

  In the system according to the present invention, an image in front of the projector is acquired by an imaging unit typified by a CCD camera built in the projector. Then, the frame of the screen in the acquired image is recognized, and the positional relationship between the projector and the screen is detected based on its shape. By obtaining a moving method for causing the projector to face the screen from the positional relationship and displaying it on the projected image of the projector, means for supporting the installation adjustment of the projector is provided.

  According to the installation position adjustment system for a front projection projector according to the present invention, the projector is directly opposed to the screen from a state where the projector is tilted with respect to the screen (see FIG. 7A) without causing deterioration of image quality. It becomes possible to install quickly to the state (refer FIG.7 (b)).

Hereinafter, an embodiment of an installation position adjustment system for a front projection projector to which the present invention is applied will be described.
As shown in FIG. 1, the installation position adjustment system in this embodiment includes a projector 11 and a screen 12 that projects an image projected from the projector 11.

The projector 11 includes an image projection unit 13, a projection lens unit 14, an imaging unit 15, a screen recognition unit 16, a control unit 17, an installation support image creation unit 18, an image input unit 19, and an operation input unit 20.
The image projection unit 13 has a function of projecting an image on the screen 12 by a display element typified by a liquid crystal panel or a DLP panel and a light source typified by a lamp. The projection lens unit 14 has a function of projecting the image projected from the image projection unit 13 onto the screen 12. The imaging unit 15 has a function of imaging the screen 12.

  The screen recognition unit 16 has a function of analyzing the image captured by the imaging unit 15 and recognizing the shape of the screen 12 from the black mask (black frame) of the screen 12. The control unit 17 analyzes the direction in which the projector 11 is moved from the shape of the screen detected by the screen recognition unit 16 so that the projector 11 can be installed at a position facing the screen 12, and information on the analysis result is obtained. It has a function of transmitting to the installation support image creation unit 18. The control unit 17 also has a function of controlling the imaging unit 15 and the like.

  The installation support image creation unit 18 has a function of creating a screen for supporting how to move the projector 11 based on information from the control unit 17. An image output from a computer, a video deck, or the like (not shown) is input to the external image input unit 19. The operation input unit 20 has a function of allowing the user to perform operations such as starting installation adjustment on the projector 11. Specifically, the operation input unit 20 includes a button switch disposed in the main body of the projector 11.

Next, a method for installing the projector 11 in a state of facing the screen using the installation position adjustment system for the front projection type projector will be described.
First, the installation adjuster installs the imaging unit 15 of the projector 11 at a position where the screen 12 can be imaged, and the projector 11 is turned on. Next, the operation input unit 20 of the projector 11 is operated by the installation coordinator, and an installation adjustment support start command is transmitted to the control unit 17 so that the operation of the installation position adjustment system is started.

  As shown in FIG. 2, when installation adjustment is started, the control unit 17 issues an imaging command to the imaging unit 15. Then, the imaging unit 15 that receives the imaging command performs imaging of the screen (step S1). The image picked up by the image pickup unit 15 is sent to the screen recognition unit 16, and the screen recognition unit 16 recognizes the frame of the screen and detects the shape of the screen 12 in the image (step S2).

  The screen shape detected by the screen recognition unit 16 is sent to the control unit 17, and the control unit 17 faces the screen 12 in which direction the projector 11 is moved based on the shape of the screen 12. The calculation about whether it can be installed is performed (step S3). Then, the information on the movement direction obtained by the calculation is sent to the installation support image creation unit 18, and the installation support image creation unit 18 converts the image according to the information on the movement direction into an image captured by the imaging unit 15. A moving direction instruction image is created by superimposing (step S4).

  The moving direction instruction image is displayed on the screen 12 through the image projection unit 13 and the projection lens unit 14 (step S5). Then, the position of the projector 11 is adjusted based on the movement direction instruction image projected on the screen 12 (step S6). When the position adjuster finishes adjusting the position of the projector 11, a position adjustment end instruction is issued from the operation input unit 20 (step S7). When the position adjustment end instruction is input, the position adjustment system ends the operation, and when there is no input, the process returns to the imaging process (step S1) of the screen 12. Thereafter, the processes of steps S1 to S6 are repeated by the screen position adjustment system.

Next, a method for detecting the screen position in the screen recognition unit 16 will be described.
As shown in FIG. 3, the image display surface of the screen 12 is usually white or a color similar to it so as to reflect the light of the projector 11, and a black frame 21 that does not reflect the light is provided on the outside thereof. ing. This extreme color difference is used to recognize the screen 12. A boundary line 23 is formed by recognizing a color boundary point in the captured image 22 captured by the imaging unit 15 and connecting the color boundary points. Next, the screen recognition unit 16 can obtain the positions of the four corners of the screen 12 by calculating the intersection 24 of the boundary line 23.

Next, a method for detecting the tilt of the projector 11 will be described.
Note that the inclination of the projector 11 is detected by the control unit 17 based on the position information of the four corners of the screen 12 detected by the screen recognition unit 16.
As shown in FIG. 4 (a), when the screen 12 has a trapezoidal shape with the left and right sides being the upper surface or the bottom surface, the control unit 17 causes the projector 11 to move either right or left from the method facing the screen 12. It is judged to be leaning. Specifically, when the length of the left side 31 is longer than the length of the right side 32, the projector 11 tilts to the right from the method of facing the screen 12 as shown in FIG. It is judged that Then, information that the projector 11 should be rotated to the left is transmitted to the installation support image creation unit 18.

  On the other hand, when the length of the right side 32 is larger than the length of the left side 31, the control unit 17 determines that the projector 11 is tilted to the left from the method of facing the screen 12. Then, information that the projector 11 should be rotated to the left is transmitted to the installation support image creation unit 18. When the length of the left side 31 and the length of the right side 32 are equal, the control unit 17 determines that the projector 11 is facing the screen 12. In this case, information that the projector 11 should be rotated is not transmitted to the installation support image creation unit 18.

  In addition, as shown in FIG. 4C, when the length of the upper side 33 is larger than the length of the lower side 34, the projector 11 is positioned more than the position facing the screen 12 as shown in FIG. The controller 17 determines that the front side is inclined upward. Then, information that the projector 11 should be rotated downward is transmitted to the installation support image creation unit 18. When the length of the upper side 33 is smaller than the length of the lower side 34, the control unit 17 determines that the projector 11 is tilted forward from the position facing the screen 12. Then, information that the projector 11 should be rotated upward is transmitted to the installation support image creation unit 18.

When the length of the upper side 33 is equal to the length of the lower side 34, the control unit 17 determines that the projector 11 is facing the screen 12. In this case, information that the projector 11 should be rotated is not transmitted to the installation support image creation unit 18.
Further, as shown in FIG. 4E, when the length of the left side 31 is equal to the length of the right side 32, the length of the upper side 33 is equal to the length of the lower side 34, and the left side 31 is not vertical, FIG. As shown in (f), the control unit 17 determines that the projector 11 is rotating from the position facing the screen 12. Then, information indicating that the projector 11 should be rotated is transmitted to the installation support image creation unit 18.

  In the installation support image creation unit 18, screens for supporting how the position adjuster should rotate the projector 11 based on the information transmitted from the control unit 17 (FIGS. 6A to 6A). f) see) is created. When the control unit 17 determines that the projector 11 is facing the screen 12, the information is not transmitted to the installation support image creation unit 18. Therefore, the installation support image creation unit 18 does not create a screen for supporting how the position adjuster should rotate the projector 11.

Next, a method for detecting the position of the projector 11 will be described.
The position of the projector 11 is detected by the control unit 17 based on the position information of the four corners of the screen 12 detected by the screen recognition unit 16 and the information of the barycentric point 35 of the screen 12 obtained from the position information. Is done.
When the information regarding the tilt of the projector 11 is not transmitted from the control unit 17 to the installation support image creating unit 18, it is determined whether the position of the projector 11 needs to be supported.

  As shown in FIG. 5A, when the length of the left side of the screen 12 is equal to the length of the right side and the center of gravity 35 of the screen 12 is shifted to the left from the center point 36 of the captured image 22, As shown in FIG. 5B, the control unit 17 determines that the projector 11 is shifted to the right side from the center of the screen. Then, information indicating that the projector 11 should be translated in the left direction is transmitted to the installation support image creation unit 18.

In addition, as shown in FIG. 5C, when the length of the upper side and the length of the lower side of the screen 12 are equal and the center of gravity 35 of the screen 12 is shifted above the center point 36 of the captured image 22. As shown in FIG. 5D, the control unit 17 determines that the projector 11 is shifted downward from the center of the screen 12. Then, information that the projector 11 should be translated downward is transmitted to the installation support image creation unit 18.
In the installation support image creation unit 18, based on the information transmitted from the control unit 17, a screen for supporting how the position adjuster should move the projector 11 in parallel (FIG. 6G to FIG. 6A). (See (j)) is created.

INDUSTRIAL APPLICABILITY The projector position adjustment system according to the present invention includes a means for assisting the position adjustment of the projector so as to eliminate the distortion of the image caused by the projector not facing the screen. This has the effect of adjusting the installation position of the projector. Further, since it can be realized by adding only an image capturing function represented by a CCD camera and software for position adjustment support to the projector, it is useful as an installation position adjustment system for a front projection type projector.

Next, the technical idea that can be grasped from the above embodiment will be described below.
A front surface comprising means for acquiring the position of the screen by imaging the forward direction of the projector with an imaging unit mounted on the projector and detecting a frame of the screen reflected in the captured image Projection projector installation position adjustment system.

  A means for acquiring the shape of the screen by imaging the forward direction of the projector with an imaging unit mounted on the projector and detecting a frame of the screen reflected in the captured image; and Means for projecting an image indicating a moving direction for installing the projector at an optimal position from the front projection type projector to the screen when it is determined that the position is not optimal with respect to the screen; An installation position adjustment system for a front projection type projector characterized by

The block diagram of the installation position adjustment system of the projector of this invention. The process flowchart which shows the outline | summary of the process in embodiment. Explanatory drawing for recognizing the position of the screen. Explanatory drawing about the method of detecting the inclination of a projector. Explanatory drawing about the method of detecting the position of a projector. (A) is an image prompting the projector 11 to rotate leftward, (b) is an image prompting the projector 11 to rotate rightward, and (c) is rotating the front of the projector 11 downward. (D) is an image urging to rotate the front of the projector 11 upward, (e) is an image urging to rotate the left side of the projector 11 upward, and the right side is rotated downward. An image prompting to rotate the right side of the projector 11 upward, and a left side downward, (g) an image prompting the projector 11 to translate in the left direction, and (h) translating the projector 11 in the right direction. (I) is an image that prompts the projector 11 to translate upward, and (j) is an image that prompts the projector 11 to translate downward. Explanatory drawing of the effect of the installation position system of the projector in this invention. The operation explanatory view of the projector installation position adjustment system in the past.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Front projection type projector, 12 ... Screen, 13 ... Image projection part, 14 ... Projection lens part, 15 ... Imaging part, 16 ... Screen recognition part, 17 ... Control part, 18 Installation assistance image creation part

Claims (1)

In a front projection projector installation position adjustment system comprising a front projection projector and a screen for projecting an image projected from the front projection projector,
The front projection projector is
An image projection unit having a light source and projecting an image;
A projection lens unit for projecting an image projected from the image projection unit onto the screen;
An imaging unit for imaging the screen;
A screen recognition unit that recognizes the shape of the screen by analyzing an image captured by the imaging unit;
Based on the shape of the screen detected by the screen recognition unit, it is determined how to move or rotate the front projection type projector so that the front projection type projector and the screen are installed in a position facing each other. And a controller that outputs information related to the determination;
An installation support image creating unit that creates a screen for supporting how to move or rotate the front projection projector based on information transmitted from the control unit; Projection projector installation position adjustment system.

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