JP2010166360A - Projector, control method thereof, and control program thereof - Google Patents

Abstract

A projector capable of improving convenience is provided.
A projector includes an image projecting unit that forms an image according to image information, projects the projected image onto a projection surface, and displays a projection image Fg, and a control unit that controls the image projecting unit. . Four instruction means M1 to M4 for instructing the four corner positions of the display area of the projection image Fg by the projector 1 are detachably attached to the projection surface Sc. The control means 5 includes an indication position recognition means 511 that recognizes each indication position by the four indication means M1 to M4, and a display correction that causes the image projection means 2 to form an image in which the four corner positions of the projection image Fg coincide with each indication position. Means 515.
[Selection] Figure 1

Description

  The present invention relates to a projector, a control method thereof, and a control program thereof.

2. Description of the Related Art Conventionally, a technique is known in which a projector adjusts the size of a projected image, adjusts the position of a projected image, and corrects keystone distortion by digital processing (see, for example, Patent Document 1).
In the technique described in Patent Document 1, based on dimension information regarding the size of a projection image input to an operation unit such as a remote controller or an operation panel, position information indicating that the position of the projection image is moved by a predetermined amount in a predetermined direction, and the like. Thus, the various digital processes described above are performed.
That is, the user inputs the above-described dimension information and position information using the operation unit when displaying a projection image in a display area of a desired size and a desired position on the projection surface. Through the above operation, the projection image is displayed in the display area designated by the user.

JP 2005-192188 A

However, in the technique described in Patent Document 1, since it is necessary to specify a display area using the operation unit, there is a problem that the operation becomes complicated for a user who is not used to operating the operation unit. is there.
For this reason, there is a demand for a technique that can easily display a projected image in a desired display area and can improve convenience.

  An object of the present invention is to provide a projector capable of improving convenience, a control method thereof, and a control program thereof.

The projector of the present invention is a projector including an image projecting unit that forms an image according to image information and projects the projected image onto a projection surface to display a projected image, and a control unit that controls the image projecting unit. Four instruction means for indicating the four corner positions of the display area of the projected image by the projector are detachably attached to the projection surface, and the control means recognizes each position indicated by the four instruction means. It is characterized by comprising indication position recognition means, and display correction means for causing the image projection means to form an image in which the four corner positions of the projected image coincide with each indicated position.
Here, as a method for recognizing the designated position, a method for recognizing the designated position based on each distance from the arrangement position of the image projecting means measured by the distance measuring means such as an ultrasonic distance measuring device to each indicating means. Further, a method of recognizing the designated position based on a captured image captured by an imaging unit such as a CCD (Charge Coupled Device) camera can be exemplified.

In the present invention, since the control means includes the indication position recognition means and the display correction means, as shown below, it is possible to display a projection image in which the four corner positions match each indication position.
That is, the pointing position recognition means recognizes the pointing positions by the four pointing means by using the pointing position recognition method described above, for example (pointing position recognition step).
Then, the display correction unit corrects the image information, thereby causing the image projection unit to form an image in which the four corner positions of the projection image coincide with each indicated position (display correction step).

For this reason, the user simply attaches four instruction means on the projection surface, designates a display area of a desired size and a desired position, and executes the above-described processing by the projector to project the designated display area. An image is displayed. Therefore, even a user who is not familiar with the operation of the operation unit can easily specify the display area without operating the operation unit, and the convenience can be improved.
In addition, the display correction means automatically performs trapezoidal distortion correction in addition to the size adjustment and position adjustment of the projection image in order to cause the image projection means to form an image in which the four corner positions of the projection image match each indicated position. Become. Therefore, the user can cause the projector to automatically perform trapezoidal distortion correction by simply attaching the four instruction means to the projection surface without operating the operation unit, thereby further improving convenience. .

  In the projector according to the aspect of the invention, the projector includes a distance measuring unit that measures each distance from an arrangement position of the image projecting unit to each indicated position, and the indicated position recognizing unit is configured to determine each indicated position based on each distance. The control means recognizes a projection distance calculation means for calculating a projection distance from the arrangement position to the projection surface based on each indicated position, and an entire effective area where the image can be formed. Virtual position specifying means for specifying the virtual positions of the four corners of the virtual projection image displayed on the projection surface that is separated from the projector by the projection distance and directly faces when the image is formed; A first intersecting position calculating means for calculating each first intersecting position where each straight line connecting the installation position and each indicated position intersects with a virtual plane formed by each of the virtual positions; and the display correcting means, Each Based on the virtual position and the respective first intersection, said be formed the image on the entire formation region surrounded by each position corresponding to each first intersection preferred in the effective area.

In the present invention, the control means includes a projection distance calculating means, a virtual position specifying means, and a first intersection position calculating means in addition to the indicated position recognizing means and the display correcting means. Projection images in which the four corner positions are matched can be displayed.
In other words, the projection distance calculation means calculates the projection distance based on each indicated position recognized by the indicated position recognition means.
Here, if the projection distance is determined by the specifications of the image projection means (optical characteristics of the projection lens), when an image is formed on the entire effective area of the image projection means, the projector is separated by the projection distance, and The size of the projected image displayed on the projection surface that faces directly is also determined.
For this reason, the virtual position specifying unit uses the relationship between the projection distance determined by the above-described specification of the image projection unit and the size of the projection image (virtual projection image), thereby calculating the projection distance calculated by the projection distance calculation unit. The virtual positions of the four corners of the virtual projection image displayed on the projection surface facing away from each other are specified.

The first intersecting position calculation means is configured so that each straight line connecting the arrangement position of the image projecting means (lens center position of the projection lens) and each indicated position intersects the virtual plane formed by each virtual position. One intersection position is calculated.
Here, since each 1st crossing position is a position where each above-mentioned straight line and a virtual plane cross, if it constitutes so that a projection picture may be displayed in a field surrounded by each 1st crossing position in a virtual plane, On the projection surface, it is possible to display a projection image in which the four corner positions match each indicated position.
The virtual positions are the four corner positions of the virtual projection image displayed on the projection surface when an image is formed over the entire effective area. For this reason, the area surrounded by each virtual position is an area corresponding to the effective area of the image projection means.
Therefore, the display correction means expands the positional relationship between each virtual position and each first intersection position to the coordinates on the effective area, so that the area surrounded by each first intersection position in the virtual plane is within the effective area. The formation area for displaying the projection image that is unfolded and the four corner positions coincide with each indicated position can be specified. The display correction unit forms an image over the entire formation region.
With the above configuration, it is possible to accurately identify a formation area necessary for displaying a projection image in which the four corner positions match each indication position. Therefore, it is possible to display a projection image in which the four corner positions are accurately matched to each indicated position.

In the projector according to the aspect of the invention, the control unit may include a second intersection position calculation unit that calculates a second intersection position where a straight line connecting the center position of each indicated position and the arrangement position intersects the virtual plane, The display correction unit forms the image in which the image center coincides with a position corresponding to the second intersection position in the effective area in the entire formation area based on each virtual position and the second intersection position. It is preferable.
By the way, when the projection surface is not directly facing the projector and is inclined, it is possible to display a projection image in which the four corner positions match each indicated position by performing the above-described processing. The following distortion occurs in the projected image.
That is, in the projected image, the region displayed on the projection surface on the side close to the projector is a compressed image because the distance from the projector is short. On the other hand, the area displayed on the side away from the projector is a stretched image because the distance from the projector is long.

In the present invention, since the control means includes the second intersection position calculation means, the display correction means can correct the distortion generated in the above-described projection image as described below.
That is, the second intersection position calculation means calculates a second intersection position where a straight line connecting the center position of each indicated position and the arrangement position of the image projection means intersects the virtual plane.
Here, since the second intersection position is a position where the above-described straight line and the virtual plane intersect, if the projection image in which the image center coincides with the second intersection position on the virtual plane is displayed, it is projected. The image center of the projection image can be positioned at the center position of each indicated position on the surface.
Accordingly, the display correction unit compresses or expands the image, and forms an image whose image center matches the position corresponding to the second intersection position in the effective area over the entire formation area, thereby causing the projector to project the projected surface. It is possible to cancel the above-described distortion of the projected image that occurs when the angle is inclined, and to display a good projected image with the four corner positions matching each indicated position and without distortion.

A control method of the present invention is a projector control method comprising: an image projection unit that forms an image according to image information, projects the projected image onto a projection surface, and displays a projection image; and a control unit that controls the image projection unit. The four projection means for instructing the positions of the four corners of the display area of the projection image by the projector are detachably attached to the projection surface, and the control means is provided with each instruction by the four designation means. An instruction position recognition step for recognizing a position, and a display correction step for causing the image projection means to form an image in which the four corner positions of the projection image coincide with each instruction position are performed.
Since the control method of the present invention is implemented by the projector described above, it can enjoy the same operations and effects as the projector described above.

The control program of the present invention is a projector control program comprising an image projecting unit that forms an image according to image information, projects the projected image onto a projection surface, and displays a projected image, and a control unit that controls the image projecting unit. Then, the control means described above is executed by the control means.
Since the control program of the present invention is used to implement the control method described above, it can enjoy the same operations and effects as the control method described above.

[First embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
[Configuration of projector]
FIG. 1 is a block diagram showing the configuration of the projector 1 in the first embodiment.
The projector 1 forms an image according to the image information and projects it on the projection surface Sc (FIG. 1), and displays the projection image Fg (FIG. 1) on the projection surface Sc.
Here, a screen, a white board, or the like can be adopted as the projection surface Sc. Further, as shown in FIG. 1, four instruction marks M1 to M4 are attached to the projection surface Sc as instruction means for instructing the four corner positions of the display area of the projection image Fg by the projector 1.
Although not specifically shown, these instruction marks M1 to M4 are made of a material that reflects ultrasonic waves, and are detachably attached to the projection surface Sc by the user.
As shown in FIG. 1, the projector 1 described above is roughly composed of an image projecting unit 2, an input unit 3, a distance measuring unit 4, and a control unit 5.

The image projecting unit 2 forms an image and projects it on the projection surface Sc under the control of the control unit 5. As shown in FIG. 1, the image projection unit 2 includes a light source device 21, a light modulation device 22, and a projection lens 23 as a projection optical device.
The light source device 21 emits a light beam toward the light modulation device 22 under the control of the control means 5.
The light modulation device 22 is composed of a liquid crystal panel, modulates the light beam emitted from the light source device 21 based on the drive signal from the control means 5, forms an image, and emits it to the projection lens 23.
The projection lens 23 projects the image emitted from the light modulation device 22 onto the projection surface Sc.

The input unit 3 includes a remote controller (not shown) and an operation panel that is exposed to the exterior casing of the projector 1. The input unit 3 recognizes an operation by the user and outputs a predetermined operation signal to the control unit 5.
The distance measuring means 4 is provided in the vicinity of the projection lens 23, and measures the distance from the arrangement position (lens center position) of the projection lens 23 to the target object. In the present embodiment, the ultrasonic distance measuring device. It consists of
That is, the distance measuring unit 4 is not specifically illustrated, but includes a transmitting unit that transmits ultrasonic waves to the target object (the instruction marks M1 to M4 attached to the projection surface Sc), and the instruction marks M1 to M1. Receiving means for receiving the ultrasonic waves reflected by M4, and calculating means for calculating each distance from the indication marks M1 to M4 based on the time from transmission to reception of the ultrasonic waves.
Then, the distance measuring means 4 outputs a signal corresponding to the calculated distance to the control means 5.

The control unit 5 includes a main control unit 51 including a CPU (Central Processing Unit) and the like, and controls the entire projector 1 according to a control program stored in the memory 52. The control means 5 will mainly describe the function of performing image processing so that the projected image Fg matches the display area indicated by the instruction marks M1 to M4, and description of other functions will be omitted.
As shown in FIG. 1, the control means 5 includes a signal processing unit 53, a panel drive control unit 54, a distance measurement control unit 55, etc., in addition to the main control unit 51 and the memory 52. These components 51 to 55 are connected by a bus (not shown) so that necessary information can be transmitted.

The signal processing unit 53 converts an image signal (image information) input from an external device into a digital signal (digital image data) that can be processed by the panel drive control unit 54 and outputs the digital signal to the panel drive control unit 54.
The panel drive control unit 54 is a part that controls the operation of the light modulation device 22 in accordance with a control signal from the main control unit 51. As shown in FIG. 1, the panel drive control unit 54 includes an image processing unit 541, a panel drive unit 542, and the like.
The image processing unit 541 performs resolution conversion processing for matching the resolution to the resolution (number of pixels) of the light modulation device 22, image size adjustment processing such as enlargement / reduction, and the like for the digital image data output from the signal processing unit 53. A forming position changing process for changing the position of a forming area for forming an image in an effective area in which an image can be formed in the modulation device 22, a brightness adjusting process, a contrast adjusting process, a sharpness adjusting process, a trapezoidal distortion correcting process, a gamma correction Various image processing such as processing is performed. The image processing unit 541 has an image memory 541A for performing the above-described image processing, as shown in FIG.
The image memory 541A has a data storage area in which a predetermined address is set, and includes a frame buffer that stores image data for one screen.

  The panel drive unit 542 generates a drive signal for driving the light modulation device 22 from the image data subjected to the image processing in the image processing unit 541, and outputs the drive signal to the light modulation device 22 so that the light is emitted. The modulation device 22 forms an image based on the image data.

  The distance measurement control unit 55 causes the distance measurement unit 4 to calculate each distance from the instruction marks M1 to M4 in accordance with a control signal from the main control unit 51. Further, the distance measurement control unit 55 drives a drive unit (not shown) such as a motor in accordance with a control signal from the main control unit 51 to change the transmission direction (angle) of the ultrasonic wave from the distance measurement unit 4. To do.

The main control unit 51 outputs a predetermined control signal to each of the components 53 to 55 according to a control program stored in the memory 52, and executes a predetermined process. As shown in FIG. 1, the main control unit 51 includes designated position recognition means 511, projection distance calculation means 512, virtual position specification means 513, first intersection position calculation means 514, display correction means 515, and the like. Prepare.
The indication position recognition unit 511 outputs a control signal to the distance measurement control unit 55, causes the distance measurement unit 4 to measure each distance from the lens center position to the indication marks M1 to M4, and measures each measured distance. The indication positions of the indication marks M1 to M4 are recognized based on the angle of the distance measuring means 4 (the angle at which the ultrasonic waves are transmitted).

The projection distance calculation means 512 calculates the projection distance from the lens center position to the projection surface Sc based on each indicated position.
When the virtual position specifying unit 513 forms an image in the entire effective area of the light modulation device 22, the projected surface is opposed to the projector 1 by the projection distance calculated by the projection distance calculation unit 512 and is directly opposed. Each virtual position of the four corners of the virtual projection image virtually displayed on Sc is specified.

The first intersection position calculation means 514 calculates each first intersection position where each straight line connecting the lens center position and each indicated position intersects with a virtual plane formed by each virtual position.
The display correction unit 515 specifies a formation region surrounded by each position corresponding to each first intersection position in the effective region of the light modulation device 22 based on each virtual position and each first intersection position. Then, the display correction unit 515 outputs a control signal to the panel drive control unit 54, performs image processing, and forms an image in the entire formation region in the effective region of the light modulation device 22.

In addition to the control program, the memory 52 stores a plurality of related information used when calculating each virtual position.
By the way, if the projection distance is determined by the specifications (optical characteristics) of the projection lens 23, when the image is formed on the entire effective area of the light modulator 22, it is separated from the projector 1 (lens center position) by the projection distance. And the size (virtual display area) of the projected image displayed on the projection surface Sc facing each other is also determined.
The memory 52 stores a plurality of pieces of related information in which the projection distance and the four corner positions (virtual positions) of the virtual display area are associated as information determined by the specifications of the projection lens 23.
That is, the virtual position specifying unit 513 reads related information corresponding to the projection distance calculated by the projection distance calculating unit 512 from the memory 52, and specifies each virtual position based on the read related information.

[Projector control method]
Next, a method for controlling the projector 1 described above will be described with reference to the drawings.
FIG. 2 is a flowchart for explaining a control method of the projector 1.
FIG. 3 is a diagram for explaining a control method of the projector 1.
In FIG. 3, Po indicates a lens center position. In FIG. 3, for convenience of explanation, the lens optical axis of the projection lens 23 (passing through the lens center position Po) is defined as the Y axis, and two axes orthogonal to the Y axis are defined as the Z axis (vertical axis) and the X axis (horizontal). Adjacent coordinate system is adopted. The lens center position Po is set as the origin in the orthogonal coordinate system.
In the following description, it is assumed that four instruction marks M1 to M4 are attached in advance to the four corner positions of a desired display area on the projection surface Sc by the user.

The main control unit 51 reads out the control program from the memory 52 when the fact that the projection image is displayed in the display area indicated by the instruction marks M1 to M4 is input by the user's operation on the input means 3, The following processing is executed according to the control program.
That is, the indication position recognition unit 511 outputs a control signal to the distance measurement control unit 55 and changes the angle of the distance measurement unit 4 as appropriate, while the distance a to the indication marks M1 to M4 from the lens center position Po. d (FIG. 3) is sequentially measured, and the indication positions AD of the indication marks M1 to M4 (FIG. 3) are determined based on the measured distances a to d and the angle of the distance measuring means 4 at the time of measurement. 3, the coordinate value of the orthogonal coordinate system) is recognized (step S1: designated position recognition step).

After step S1, the projection distance calculation means 512 calculates the projection distance S (FIG. 3) based on each indicated position A to D (step S2).
Specifically, as shown in FIG. 3, the projection distance calculation unit 512 recognizes the plane E including the designated positions A to D based on the designated positions A to D, and X = A position Os (orthogonal coordinate system coordinate value) at which Z = 0 is calculated. Then, the projection distance calculation unit 512 calculates a distance (projection distance S) from the lens center position Po to the position Os.

FIG. 4 is a diagram schematically illustrating a method for calculating the virtual position and the first intersection position.
4, for convenience of explanation, in the orthogonal coordinate system shown in FIG. 3, the upper side of the projection surface Sc is inclined with respect to the XZ plane so that the upper side is close to the lens center position Po and the lower side is separated from the lens center position Po. The projected surface Sc is viewed from the + X-axis direction side.
In FIG. 4, since the position is viewed from the + X-axis direction side, the designated positions C and D located on the −X-axis direction side are shown in parentheses with respect to the designated positions A and B. The same applies to virtual positions I to L, straight lines N to Q, and first intersection positions T to W, which will be described later.

After step S2, the virtual position specifying unit 513 reads related information corresponding to the projection distance S from the memory 52, and each virtual position I to L based on the read related information (in the orthogonal coordinate system shown in FIGS. 4 and 3). (Coordinate value) is specified (step S3).
After step S3, as shown in FIG. 4, the first intersection position calculation means 514 is formed by the straight lines N to Q connecting the lens center position Po and the indicated positions A to D and the virtual positions I to L. First intersection positions T to W (coordinate values of the orthogonal coordinate system shown in FIG. 3) where the virtual plane M intersects are calculated (step S4).
Here, each of the first intersection positions T to W is a position where each of the straight lines N to Q intersects with the virtual plane M. Therefore, the projected image is projected on the area surrounded by the first intersection positions T to W on the virtual plane M. If it is configured to display Fg, it is possible to display the projection image Fg in which the four corner positions coincide with the designated positions A to D on the projection surface Sc.

FIG. 5 is a diagram schematically showing the effective area ArV of the light modulation device 22. 5 shows the formation region ArF when the projection surface Sc is positioned as shown in FIG.
After step S4, the display correction means 515, based on the virtual positions I to L and the first intersection positions T to W, each position T ′ corresponding to each first intersection position T to W in the effective area ArV. A formation region ArF surrounded by ~ W 'is specified (step S5).
Specifically, as described above, the virtual positions I to L are the four corner positions of a virtual projection image (virtual display area) displayed when an image is formed on the entire effective area ArV. For this reason, the virtual positions I to L correspond to the four corner positions I ′ to L ′ (FIG. 5) of the effective area ArV. Therefore, the display correction unit 515 develops the positional relationship between the virtual positions I to L and the first intersection positions T to W to the coordinates on the effective area ArV, so that each of the first positions in the effective area ArV. The positions T ′ to W ′ corresponding to the intersection positions T to W are calculated, and the formation region ArF for displaying the projection image Fg in which the four corner positions match the indicated positions A to D can be specified.

After step S5, the display correction unit 515 outputs a control signal to the panel drive control unit 54, performs image processing, and forms an image over the entire formation region ArF in the effective region ArV of the light modulation device 22 (step S5). S6).
Steps S5 and S6 described above correspond to the display correction step according to the present invention.
As a result of the above processing, the projection image Fg in which the four corner positions match the indicated positions A to D is displayed on the projection surface Sc.

The first embodiment described above has the following effects.
In the present embodiment, the control unit 5 includes an indication position recognition unit 511 and a display correction unit 515, and executes the above-described processing. Thus, the user simply attaches four instruction marks M1 to M4 on the projection surface Sc, and designates a display area (area surrounded by the instruction positions A to D) of a desired size and a desired position. Thus, the projection image Fg is displayed in the designated display area by executing the above-described processing in the projector 1. Therefore, even a user who is not familiar with the operation of the input unit 3 can easily specify the display area without operating the input unit 3, and the convenience can be improved.
In addition, the display correction unit 515 causes the light modulation device 22 to form an image in which the four corner positions of the projection image Fg match the indicated positions A to D, so that the keystone distortion correction is performed in addition to the size adjustment and position adjustment of the projection image Fg. Will be carried out automatically. For this reason, the user can cause the projector 1 to automatically perform the trapezoidal distortion correction without operating the input means 3 only by attaching the four instruction marks M1 to M4 to the projection surface Sc. Further improvement in performance can be achieved.

  The control unit 5 includes a projection distance calculation unit 512, a virtual position specification unit 513, and a first intersection position calculation unit 514 in addition to the designated position recognition unit 511 and the display correction unit 515, and executes the above-described processing. As a result, the formation region ArF necessary for displaying the projection image Fg in which the four corner positions match the indicated positions A to D can be accurately identified. Therefore, it is possible to display the projection image Fg in which the four corner positions are accurately matched to the designated positions A to D.

[Second Embodiment]
Next, 2nd Embodiment of this invention is described based on drawing.
FIG. 6 is a block diagram illustrating a configuration of the projector 1 according to the second embodiment.
In the following description, the same structure and the same member as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
This embodiment is different from the first embodiment in that a function for performing image processing so as to shift the image center is added to the main control unit 51 when an image is formed in the entire formation region ArF. It is.
Specifically, in the present embodiment, the display correction unit 515 has the above-described function, and the main control unit 51 includes a second intersection position calculation unit 516 as shown in FIG.

The second intersection position calculation means 516 calculates a second intersection position at which the straight line connecting the center position of each indicated position A to D and the lens center position Po intersects the virtual plane M.
In addition to the function described in the first embodiment, the display correction unit 515 outputs a control signal to the panel drive control unit 54, and an image whose image center matches a position corresponding to the second intersection position in the effective area ArV. Is formed over the entire formation region ArF.

Next, the control method of the projector 1 in this embodiment is demonstrated based on drawing.
FIG. 7 is a flowchart illustrating a method for controlling projector 1.
FIG. 8 is a diagram schematically illustrating a method of calculating the second intersection position. Specifically, FIG. 8 corresponds to FIG.
In addition, since the control method in this embodiment differs in the process after step S5 demonstrated in the said 1st Embodiment, only the process after step S5 is demonstrated.
For example, as shown in FIG. 4, when the projection surface Sc is not opposed to the projector 1 and is inclined, the steps S <b> 1 to S <b> 6 described in the first embodiment are performed, Although the projection image Fg in which the four corner positions match the instruction positions A to D can be displayed, the following distortion occurs in the projection image Fg.
That is, in the projection image Fg, the upper region displayed on the side close to the projector 1 on the projection surface Sc is a compressed image because the distance from the projector 1 is short. On the other hand, the lower area displayed on the side away from the projector 1 is a stretched image because the distance from the projector 1 is long.
Therefore, after step S5, the second intersection position calculation unit 516 and the display correction unit 515 perform steps S7, S8, and S6 ′ described below to correct the distortion generated in the projection image Fg described above.

First, after step S5, the second intersection position calculation means 516 intersects the virtual plane M with the straight line G connecting the center position F and the lens center position Po of each indicated position A to D as shown in FIG. The second intersection position H to be calculated is calculated (step S7).
Here, since the second intersection position H is a position where the straight line G and the virtual plane M described above intersect, the projection image Fg whose image center matches the second intersection position H in the virtual plane M is displayed. If comprised, the image center of the projection image Fg can be located in the center position F of each instruction | indication position AD in the to-be-projected surface Sc.

FIG. 9 is a diagram schematically showing the effective area ArV of the light modulation device 22. Specifically, FIG. 9 corresponds to FIG.
In FIG. 9, for convenience of explanation, the letter “A” is formed in the formation region ArF.
After step S7, the display correction unit 515 calculates a position H ′ corresponding to the second intersection position H in the effective area AfV (step S8).
The method for calculating the position H ′ is the same as the method for calculating each of the positions T ′ to W ′ described in the first embodiment.
After step S8, the display correction unit 515 outputs a control signal to the panel drive control unit 54, performs image processing, and forms an image in which the image center R matches the position H ′ in the entire formation region ArF (step S8). S6 ').
That is, in the example shown in FIG. 9, the panel drive control unit 54 performs image processing for expanding the upper area ArU of the original image (the letter “A”) and compressing the lower area ArL. An image in which the image center R matches the position H ′ is formed in the entire formation region ArF.
Steps S5, S8, and S6 ′ described above correspond to the display correction step according to the present invention.

According to the second embodiment described above, there are the following effects in addition to the same effects as in the first embodiment.
In the present embodiment, the control unit 5 includes the second intersection position calculation unit 516, and the second intersection position calculation unit 516 and the display correction unit 515 execute the above-described steps S7, S8, and S6 ′. As a result, the distortion of the projected image Fg that occurs when the projection surface Sc is inclined with respect to the projector 1 is offset, and the four corner positions match the indicated positions A to D, and there is no distortion. The projected image Fg can be displayed.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In each of the above-described embodiments, the distance measuring unit 4 is employed to recognize the designated positions A to D. However, the present invention is not limited to this, and other configurations may be employed. For example, an imaging unit such as a CCD camera using a CCD as an imaging element may be employed.
For example, in the imaging unit, the distance that the focus lens is moved until the instruction marks M1 to M4 included in the captured image are in focus and the distance between the imaging unit and the instruction marks M1 to M4 are correlated. It is. Therefore, it is also possible to recognize each of the designated positions A to D by adopting the imaging means and using the above correlation, as in the case where the distance measuring means 4 is adopted.
Further, for example, in the captured image, the sizes of the instruction marks M1 to M4 are correlated with the distance between the imaging unit and the instruction marks M1 to M4. Therefore, it is also possible to recognize each of the designated positions A to D by adopting the imaging means and using the above correlation, as in the case where the distance measuring means 4 is adopted.

In each of the above-described embodiments, the distance measuring unit 4 is employed, and the projection images Fg in which the four corner positions match the indicated positions A to D using the distances a to d measured by the distance measuring unit 4 are displayed. However, the present invention is not limited to this, and the above-described imaging unit may be employed to display the projection image Fg in which the four corner positions coincide with each of the instruction marks M1 to M4 as described below.
That is, the projected surface Sc is sequentially imaged by the imaging unit. In addition, in the captured image captured by the imaging unit, the instruction positions by the instruction marks M1 to M4 are recognized and the four corner positions of the projection image Fg are recognized. In the captured image, the panel drive control unit 54 performs image processing until each indicated position matches the four corner positions of the projection image Fg, and sequentially changes the formation region ArF.

  In each of the above-described embodiments, a liquid crystal panel is used as the light modulation device 22. However, as the light modulation device 22, in addition to a transmissive liquid crystal panel and a reflective liquid crystal panel, DMD (Digital Micromirror Device) (Texas Instruments, USA) May also be employed.

  Since the projector of the present invention can improve convenience, it can be used as a projector used for presentations, home theaters, and the like.

FIG. 2 is a block diagram illustrating a configuration of a projector according to the first embodiment. 6 is a flowchart for explaining a projector control method according to the embodiment. The figure for demonstrating the control method of the projector in the said embodiment. The figure which shows typically the calculation method of the virtual position and 1st crossing position in the said embodiment. The figure which shows typically the effective area | region of the light modulation apparatus in the said embodiment. The block diagram which shows the structure of the projector in 2nd Embodiment. 6 is a flowchart for explaining a projector control method according to the embodiment. The figure which shows typically the calculation method of the 2nd crossing position in the said embodiment. The figure which shows typically the effective area | region of the light modulation apparatus in the said embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Image projection means, 4 ... Distance measuring means, 5 ... Control means, 511 ... Indication position recognition means, 512 ... Projection distance calculation means, 513 ... Virtual position specifying means, 514... First intersection position calculation means, 515... Display correction means, 516... Second intersection position calculation means, A to D. -Distance, ArV ... Effective area, ArF ... Formation area, Fg ... Projection image, H ... Second crossing position, I-L ... Virtual position, M ... Virtual plane, M1 ˜M4... Indication mark (instruction means), N to Q... Straight line, Po... Lens center position (arrangement position), S... Projection distance, Sc. W ... first intersection position, S1 ... designated position recognition step, S5, S6, S6 ', S8 ... display correction step .

Claims (5)

An image projection unit that forms an image according to image information and projects the projection image onto a projection surface to display a projection image, and a control unit that controls the image projection unit,
Four instruction means for indicating the four corner positions of the display area of the projection image by the projector are detachably attached to the projection surface,
The control means includes
Pointing position recognition means for recognizing each pointing position by the four pointing means;
A projector comprising: a display correction unit that causes the image projection unit to form an image in which the four corner positions of the projection image coincide with each indicated position. The projector according to claim 1, wherein
Ranging means for measuring each distance from the arrangement position of the image projection means to each indicated position,
The indicated position recognition means includes
Recognizing each indicated position based on each distance,
The control means includes
A projection distance calculating means for calculating a projection distance from the arrangement position to the projection surface based on each indicated position;
When the image is formed over the entire effective area where the image can be formed, the virtual images at the four corners of the virtual projection image displayed on the projection surface that are separated from the projector by the projection distance and face each other. A virtual position specifying means for specifying a position;
First intersection position calculating means for calculating each first intersection position where each straight line connecting the arrangement position and each indicated position intersects a virtual plane formed by each virtual position;
The display correction means includes
The projector is characterized in that, based on each virtual position and each first intersection position, the image is formed in the entire formation area surrounded by each position corresponding to each first intersection position in the effective area. The projector according to claim 2,
The control means includes
A second intersection position calculating means for calculating a second intersection position where a straight line connecting the center position of each indicated position and the arrangement position intersects the virtual plane;
The display correction means includes
Based on each of the virtual positions and the second intersection position, the image in which the image center coincides with a position corresponding to the second intersection position in the effective area is formed in the entire formation area. . A projector control method comprising: an image projection unit that forms an image according to image information, projects the projected image onto a projection surface, and displays a projection image; and a control unit that controls the image projection unit,
Four instruction means for indicating the four corner positions of the display area of the projected image by the projector are detachably attached to the projection surface,
The control means is
An instruction position recognition step for recognizing each instruction position by the four instruction means;
And a display correction step of causing the image projection means to form an image in which the four corner positions of the projection image coincide with each indicated position. A projector control program comprising: an image projecting unit that forms an image according to image information, projects the projected image onto a projection surface, and displays a projected image; and a control unit that controls the image projecting unit,
A control program causing the control means to execute the control method according to claim 4.

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