JP2022147145A - Projector, projection system, method for correcting correction value, and program - Google Patents

Abstract

To provide a projector, a projection system, a method for correcting a correction value, and a program capable of grasping a positional relation with a projection surface and correcting a correction value even in a situation where the projection direction dynamically changes.SOLUTION: A projector includes a housing arranged to be movable with respect to the placing member, a photographing unit arranged in the housing to photograph an image including a marker included in the placing member as a marker image, and a control unit 150. The control unit 150 acquires image data and performs image correction on the acquired image data with a correction value based on a change in the location of the housing identified by the marker image captured by the photographing unit.SELECTED DRAWING: Figure 3

Description

The present invention relates to a projector, a projection system, a correction value correction method, and a program.

In Patent Document 1, in order to perform trapezoidal correction of an image projected onto a projection plane according to the first image, a second image obtained by deforming the first image is generated by interpolation processing using an interpolation filter. A projector is described that includes a trapezoidal correction unit that corrects a second image, a light modulator that emits light representing a second image, and a projection optical system that projects the light from the light modulator onto a projection surface.

JP 2015-161863 A

As described in Patent Document 1, in a projector that performs trapezoidal correction for correcting image distortion on a projection plane, it is necessary to accurately grasp the positional relationship between the projection plane and the projector in order to obtain an accurate correction value. There is As one of the methods of grasping the positional relationship, there is a method of projecting a pattern onto a projection plane, measuring the projected pattern, and calculating the inclination. However, this method requires a certain amount of time for measurement, and if the position of the projector moves during image projection, it must be measured again. rice field.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems. An object of the present invention is to provide a value correction method and program.

In order to achieve the above object, one aspect of the projector according to the present invention includes:
a housing arranged movably with respect to the mounting member;
a photographing unit arranged in the housing for photographing an image including a marker of the placement member as a marker image;
a control unit;
The control unit
get the image data,
performing image correction on the obtained image data with a correction value based on a change in the position of the housing specified by the marker image captured by the imaging unit;
It is characterized by

According to the present invention, there is provided a projector, a projection system, a correction value correction method, and a program capable of grasping the positional relationship with the projection surface and correcting the correction value even in situations where the projection direction dynamically changes. can.

1 is a block diagram showing the configuration of a projector according to an embodiment; FIG. 1 is a perspective view showing the appearance of a projector according to an embodiment; FIG. FIG. 2 is a block diagram showing the functional configuration of a control unit according to the embodiment; FIG. FIG. 4 is a side view of the projector with the housing of the embodiment parallel to the pedestal; FIG. 4 is a diagram showing a marker image captured in a state in which the housing of the embodiment is parallel to the pedestal; FIG. 4 is a side view of the projector in which the housing according to the embodiment is set at a positive elevation angle with respect to the pedestal; FIG. 4 is a diagram showing a marker image captured in a state in which the housing according to the embodiment is set at a positive elevation angle with respect to the pedestal; FIG. 2 is a top view of the projector with the housing of the embodiment facing forward with respect to the pedestal; FIG. 5 is a diagram showing a marker image captured with the housing of the embodiment facing forward with respect to the pedestal; FIG. 4 is a top view of the projector in which the housing of the embodiment is oriented in a positive azimuth with respect to the pedestal; FIG. 4 is a diagram showing a marker image captured in a state in which the housing according to the embodiment is oriented at a positive azimuth angle with respect to the pedestal; 4 is a flowchart of correction value correction processing executed by the control unit according to the embodiment;

(Embodiment)
A projector 1 according to an embodiment will be described with reference to the drawings. The same reference numerals are given to the same or corresponding parts in the drawings. The projector 1 according to the embodiment is an image projection device that projects and displays an image on a screen.

FIG. 1 is a block diagram showing the configuration of a projector 1 according to an embodiment. As shown in FIG. 1 , the projector 1 includes a projection section 110 , an input section 120 , an operation section 130 , an imaging section 140 , a control section 150 and a storage section 160 .

The projection unit 110 outputs a projection image determined by the projection image data as light rays, and projects the light onto the screen. Projection unit 110 includes a DMD (Digital Micromirror Device), a DMD controller, a lens, a lens driving motor, and a light source.

The input unit 120 is connected to an external device and transmits input image data input as analog information or digital information from the external device to the control unit 150 . The input unit 120 may include, but is not limited to, an image input terminal that may include an analog RGB terminal, an S terminal, and an HDMI (High-Definition Multimedia Interface, registered trademark) terminal, and an input control unit. .

Operation unit 130 accepts an operation by a user who intends to operate projector 1 and transmits a signal corresponding to the operation to control unit 150 . The operation unit 130 receives operations including, for example, power on/off, projection start/end, and brightness adjustment, but is not limited to these. The operation unit 130 may include buttons, a touch panel, a remote controller, and a remote controller receiver, but is not limited to these.

The photographing unit 140 continuously photographs the pedestal 230 including the marker 240, which will be described later, and sequentially transmits the photographed images to the control unit 150 as marker images. The imaging unit 140 may include a CCD (Charge Coupled Device) image sensor, a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and a lens, but is not limited to this.

The control unit 150 is a processing device that controls the entire projector by executing programs stored in the storage unit 160 . Control unit 150 may include a CPU (Central Processing Unit), but is not limited to this.

The storage unit 160 is a storage medium that stores programs executed by the control unit 150 or data used by the control unit 150 . The storage unit 160 may include ROM (Read Only Memory) and RAM (Random Access Memory), but is not limited to these.

FIG. 2 is a perspective view showing the appearance of the projector 1. As shown in FIG. As shown in FIG. 2, the projector 1 includes a housing 210, a support section 220, a pedestal 230, and a marker 240. As shown in FIG.

The housing 210 is arranged with the projection unit 110, the input unit 120, the operation unit 130, and the imaging unit 140 exposed to the outside, and the control unit 150 and the storage unit 160 are arranged inside. be. The locations where the projection unit 110, the input unit 120, the operation unit 130, and the imaging unit 140 are arranged are not limited to the locations shown in FIG. The housing 210 may contain, for example, metal or resin, but is not limited to this.

The support unit 220 is connected to one surface of the housing 210 on which the imaging unit 140 is arranged and the pedestal 230, and supports the housing 210 so as to be rotatable about two axes of azimuth and elevation with respect to the pedestal 230. . The user can change the direction in which the projector 1 projects an image by gripping and moving the housing 210 . The support part 220 may contain, for example, metal or resin, but is not limited to this.

The pedestal 230 is connected to one end of the support portion 220 . A marker 240 is arranged on one surface of the pedestal 230 facing the housing 210 . The marker 240 is, for example, a circular mark printed on the pedestal 230, but is not limited to this, and may be of any shape, color and size.

The control unit 150 will be explained in detail. FIG. 3 is a block diagram showing the functional configuration of the control section 150. As shown in FIG. As shown in FIG. 3 , the control unit 150 includes an input image data acquisition unit 151 , a marker image acquisition unit 152 , an angle calculation unit (calculation unit) 153 , a correction unit 154 and an output unit 155 .

The input image data acquisition unit 151 acquires input image data input to the input unit 120 from an external device, and transmits the input image data to the correction unit 154 .

The marker image acquisition unit 152 acquires the marker image captured by the imaging unit 140 , performs processing for correcting distortion due to the lens of the imaging unit 140 on the acquired marker image, and transmits the corrected marker image to the angle calculation unit 153 . .

The angle calculation unit 153 analyzes the marker image transmitted from the marker image acquisition unit 152, calculates the center position of the marker 240 on the marker image, and determines the angle of the projector 1 from the change in the center position of the marker 240 on the marker image. Elevation and azimuth changes are calculated.

The correction unit 154 acquires changes in the elevation angle and the azimuth angle of the projector 1 from the angle calculation unit 153, and corrects the correction value when performing keystone correction on the input image data according to the change in the elevation angle and the azimuth angle of the projector 1. . The correction unit 154 acquires the input image data from the input image data acquisition unit 151 and performs keystone correction on the input image data based on the corrected correction value. Any known method can be used as a method for the correction unit 154 to perform keystone correction. The correction unit 154 transmits the input image data that has undergone keystone correction to the output unit 155 as projection image data.

The output unit 155 outputs the input image data transmitted from the correction unit 154 to the projection unit 110, controls the projection unit 110 to output the projection image as light rays, and projects it on the screen.

A method for calculating changes in the elevation angle and the azimuth angle of the projector 1 by the angle calculation unit 153 will be specifically described.

A method for calculating a change in elevation angle of the projector 1 by the angle calculation unit 153 will be described. 4 is a side view of the projector 1 with the housing 210 parallel to the pedestal 230, and FIG. 5 is a marker image shot with the housing 210 parallel to the pedestal 230 as shown in FIG. FIG. 4 is a diagram showing; In FIG. 4, the x-axis extends in the direction perpendicular to the plane of the paper, and the y-axis extends in the vertical direction. In FIG. 5, the x-axis extends horizontally and the y-axis extends vertically. The origin is the axis of rotation of the connection. Let r be the distance between the marker 240 and the origin.

In the state shown in FIG. 4, the projector 1 is arranged parallel to the screen (not shown), and the keystone correction of the projected image is not required.

6 is a side view of projector 1 with housing 210 at a positive elevation angle with respect to base 230, and FIG. 7 is a side view of projector 1 with housing 210 at a positive elevation angle with respect to base 230 as in FIG. FIG. 10 is a diagram showing a marker image captured in a state where the camera is folded;

As shown in FIGS. 4-7, when the housing 210 is at a positive elevation angle with respect to the pedestal 230, the marker 240 moves downward on the marker image. That is, the distance r between the marker 240 and the origin becomes smaller.

The angle calculation unit 153 acquires the relationship between the distance r and the elevation angle stored in the storage unit 160, and applies the distance r calculated from the image data to the relationship between the distance r and the elevation angle, thereby obtaining the elevation angle from the image data. calculate. The relationship between the distance r and the elevation angle can be obtained, for example, by measuring the elevation angle in advance and storing the value of the distance r of the image data shot at that elevation angle in association with the elevation angle. The method of acquiring relationships is not limited to this.

The angle calculation unit 153 acquires, for example, a marker image (first marker image) shown in FIG. 5 at a first time point, and acquires a marker image (second marker image) shown in FIG. marker image). The angle calculator 153 compares the position of the marker 240 in the first marker image with the position of the marker 240 in the second marker image, and obtains the corresponding change in the elevation angle from the change in the distance r, thereby calculating the first time point and a second point in time. In addition to such a method, for the position of the marker image (first marker image) shown in FIG. It may be stored.

A method for calculating a change in the azimuth angle of the projector 1 by the angle calculation unit 153 will be described. 8 is a top view of the projector 1 with the housing 210 facing the front with respect to the pedestal 230, and FIG. 9 is photographed with the housing 210 facing the front with respect to the pedestal 230 as shown in FIG. FIG. 10 is a diagram showing a marker image that is drawn; 8 and 9, the x-axis extends horizontally and the y-axis extends vertically. The origin is the axis of rotation of the connection. Let θ be the angle between the straight line connecting the marker 240 and the origin and the y-axis.

As in the case of FIG. 4, in the state shown in FIG. 8, the projector 1 is arranged parallel to the screen (not shown), and keystone correction of the projected image is not required.

10 is a top view of the projector 1 with the housing 210 oriented in a positive azimuth with respect to the base 230, and FIG. It is a figure which shows the marker image image|photographed in the state attached.

As shown in FIGS. 8-11, when housing 210 is oriented in a positive azimuth with respect to pedestal 230, marker 240 moves toward a negative azimuth on the marker image. That is, the angle θ takes a negative value.

The angle calculator 153 acquires, for example, a marker image (first marker image) shown in FIG. 9 at a first time point, and acquires, for example, a marker image (second marker image) shown in FIG. marker image). The angle calculator 153 compares the position of the marker 240 in the first marker image with the position of the marker 240 in the second marker image, and calculates the angle difference θ between the straight line connecting the marker 240 and the origin and the y-axis. and -θ with the sign reversed is calculated as the change in the azimuth angle between the first time point and the second time point. In addition to such a method, for the position of the marker image (first marker image) shown in FIG. It may be stored.

As described above, the angle calculator 153 calculates changes in the elevation angle and azimuth angle of the projector 1 by calculating the distance r and the angle θ from the image data.

FIG. 12 is a flowchart of correction value correction processing executed by the control unit 150 of the projector 1 according to the embodiment. Correction value correction processing will be described with reference to the flowchart of FIG. 12 .

When the correction value correction process is started, the marker image acquisition unit 152 of the control unit 150 acquires the marker image captured by the imaging unit 140, and corrects the distortion of the acquired marker image due to the lens of the imaging unit 140. Then, the corrected marker image is transmitted to the angle calculator 153 (step S101).

When the corrected marker image is transmitted, the angle calculator 153 determines whether the marker image has changed (step S102). If there is no change (step S102: NO), the process returns to step S101.

If there is a change in the marker image (step S102: YES), the angle calculator 153 analyzes the marker image and calculates the center position of the marker 240 on the marker image (step S103).

After calculating the center position of the marker 240 on the marker image, the angle calculator 153 calculates the distance r and the angle θ on the marker image (step S104).

After calculating the distance r and the angle θ, the angle calculation unit 153 calculates changes in the elevation angle and azimuth angle of the projector 1 based on the distance r and the angle θ, and transmits the calculated elevation angle and azimuth angle to the correction unit 154 ( step S105).

When the elevation angle and the azimuth angle are transmitted, the correction unit 154 corrects the correction value for keystone correction of the input image data according to the change in the elevation angle and the azimuth angle of the projector 1 (step S106).

After correcting the correction value, the control unit 150 determines whether or not an instruction to end the correction value correction process has been given via the operation unit 130 (step S107). If it is determined that no instruction has been given (step S107: NO), the process returns to step S101.

If it is determined that the end of the correction value correction process has been instructed (step S107: YES), the correction value correction process is ended.

By having the above configuration and executing the correction value correction process, the projector 1 according to the embodiment grasps the positional relationship with the projection plane and adjusts the correction value even in a situation where the projection direction changes dynamically. can be corrected.

As one of the methods of grasping the positional relationship between the projector and the projection surface for keystone correction, there is a method in which the user designates the positional relationship via a user interface. However, this method is complicated, and the user may fail to specify, especially when both the elevation angle and the azimuth angle need to be specified. According to the projector 1 according to the embodiment, even if the user does not directly specify the positional relationship, the positional relationship can be grasped while the projector 1 is projecting, and the correction value can be corrected.

In the field of amusement, there is a case where one projector performs projection on a plurality of projection planes or a plurality of portions of a wide projection plane by switching projection points. In this case, it is difficult to interrupt the projection and perform the measurement for correcting the correction value each time the projection position is switched. According to the projector 1 according to the embodiment, it is possible to correct the correction value while continuing the projection.

According to the projector 1 according to the embodiment, since an angle is measured by photographing an image, there is no need for a wearable part such as a gear to measure the angle, which simplifies the support structure. Lifespan can be extended.

(Modification)
Although the embodiment of the present invention has been described above, this embodiment is an example, and the scope of application of the present invention is not limited to this. That is, the embodiments of the present invention can be applied in various ways, and all embodiments are included in the scope of the present invention.

Although the correction unit 154 modifies the correction value for keystone correction of the input image data and performs keystone correction on the input image data based on the corrected correction value, it is not limited to this. Any image correction other than trapezoidal correction may be performed on the input image data.

Although the user can change the direction in which the projector 1 projects an image by gripping and moving the housing 210, the present invention is not limited to this. The support part 220 may be powered and operate according to the control of the control part 150 independently of the user's hand. For example, the control unit 150 may control the support unit 220 according to a program stored in the storage unit 160 to change the azimuth angle of the housing 210 over time, ie, swing. By operating in this way, the projector 1 can, for example, project onto different parts of a wide screen while appropriately performing keystone correction.

Although the marker 240 is arranged on one surface of the pedestal 230 facing the housing 210, it is not limited to this. It is sufficient if it is arranged at a position where it can be photographed by the photographing unit 140 , and it does not have to be arranged on the projector 1 .

Although the marker 240 is a circular mark printed on the pedestal 230, it is not limited to this. The marker 240 may be a light source including an LED (Light Emitting Diode). When the projector 1 performs projection, the room may be darkened so that the projected image can be clearly seen. Even in such a case, by using the marker 240 as a light source, it is possible to accurately grasp the position of the marker 240 on the marker image.

In addition, the marker 240 is not limited to the mark printed on the base 230 and the light source, and includes patterns or scratches on the base 230 . The control unit 150 may change the correction value of the projected image based on the change in the positional relationship of the pattern or flaw according to the change in elevation angle and azimuth angle of the projector 1 .

Although the projector 1 is provided with the pedestal 230, it is not limited to this. The pedestal 230 may not be provided, and may be mounted on a mounting member that functions as the pedestal 230, including a desk, wall, floor, and ceiling. In this case, one end of the support portion 220 is connected to the mounting member. The projector 1 may use a marker 240 printed on the placement member, or may use a pattern or a scratch on the placement member as the marker 240 .

When the projector 1 uses a pattern or a scratch on the pedestal 230 or the mounting member as the marker 240, the photographing unit 140 photographs the pedestal 230 or the mounting member, and the position of the pattern or the scratch that can be used as the marker 240 is determined from the photographed image. , for example, the binarization method may be used to specify, and the positional relationship of the specified pattern or flaw may be used to determine the correction value.

Although the supporting portion 220 supports the housing 210 so as to be rotatable about the two axes of azimuth and elevation with respect to the base 230, it is not limited to this. The support portion 220 may support the housing 210 so as to be slidable in the horizontal direction or the vertical direction with respect to the base 230 . In this case, the calculator 153 calculates the amount of movement of the projector 1 in the horizontal direction or the vertical direction from the change in the center position of the marker 240 on the marker image.

Although the projector 1 according to the embodiment is an image projection device that projects and displays an image on a screen, it is not limited to this. It may be mounted on a moving object that moves on a surface including a curved surface and a flat surface, and an image may be projected onto the surface. A moving object includes, but is not limited to, a vehicle that moves on the floor. By being mounted on a mobile body, the projector 1 can present information including, for example, the direction of travel and a map to the operator. Keystone correction can be performed without

Although the control unit 150 includes the input image data acquisition unit 151, the marker image acquisition unit 152, the angle calculation unit 153, and the correction unit 154, it is not limited to this. The control unit 150 does not include part or all of the marker image acquisition unit 152, the angle calculation unit 153, and the correction unit 154, and the external device other than the projector 1 includes the marker image acquisition unit 152 and the angle calculation unit 153. , the correction unit 154, and functions that the control unit 150 does not have. In this case, the projector 1 and the external device include a communication unit that communicates with each other to exchange input image data, marker images, or correction value data.

The projector 1 and the external device constitute a projection system. Calculation of the position change of the housing 210, correction of correction values, and correction of input image data may be performed by either the projector 1 or an external device. External devices may include, but are not limited to, personal computers, tablets, and smartphones.

In addition to being able to provide a projector having a configuration for realizing the function according to the present invention in advance, it is also possible to make an existing projector function as a projector according to the present invention by applying a program. That is, by applying a program for realizing the functions of the projectors exemplified in the embodiments and modified examples so that the CPU or the like that controls the existing projector can be executed, it is possible to make the projector function as the projector according to the present invention. can. Also, the correction value correction method according to the present invention can be implemented using a projector.

Moreover, the application method of such a program is arbitrary. The program can be applied by storing it in a computer-readable storage medium such as a flexible disk, CD (Compact Disc)-ROM, DVD (Digital Versatile Disc)-ROM, memory card, or the like. Furthermore, a program can be superimposed on a carrier wave and applied via a communication medium such as the Internet. For example, the program may be posted and distributed on a bulletin board (BBS: Bulletin Board System) on a communication network. Then, the above processing may be executed by activating this program and executing it in the same manner as other application programs under the control of an OS (Operating System).

Although preferred embodiments of the present invention have been described above, the present invention is not limited to such specific embodiments, and the present invention includes the invention described in the claims and the scope of equivalents thereof. and are included. The invention described in the original claims of the present application is appended below.

(Appendix 1)
a housing arranged movably with respect to the mounting member;
a photographing unit arranged in the housing for photographing an image including a marker of the placement member as a marker image;
a control unit;
The control unit
get the image data,
performing image correction on the obtained image data with a correction value based on a change in the position of the housing specified by the marker image captured by the imaging unit;
A projector characterized by:

(Appendix 2)
The correction value is determined based on a change in the housing position specified by a change in the marker position on the marker image.
The projector according to appendix 1, characterized by:

(Appendix 3)
The change in position of the housing is
A position of the marker included in the first marker image captured by the imaging unit at a first time point, and a second marker image captured by the imaging unit at a second time point different from the first time point. identified by a result of comparison with the position of the marker,
The control unit
performing image correction of the acquired image data with a correction value based on a change in the position of the housing;
3. The projector according to appendix 1 or 2, characterized by:

(Appendix 4)
The control unit identifies the position of the marker on the marker image by analyzing the marker image captured by the imaging unit, and determines the amount of change in the position of the housing from the change in the position of the marker. do,
The projector according to any one of Appendices 1 to 3, characterized by:

(Appendix 5)
wherein the control unit determines the correction value based on a change in the marker position on the marker image;
5. The projector according to any one of Appendices 1 to 4, characterized by:

(Appendix 6)
The mounting member is a pedestal for fixing the projector,
The projector according to any one of Appendices 1 to 5, characterized by:

(Appendix 7)
The housing is arranged to be rotatable about two axes with respect to the mounting member,
The control unit calculates at least one of a change in the elevation angle or the azimuth angle of the housing from the change in the position of the marker.
The projector according to any one of Appendices 1 to 6, characterized by:

(Appendix 8)
Equipped with a projection unit that outputs a projected image as light rays,
The control unit outputs the image data to the projection unit, and controls the projection unit to output the image data as the projection image.
The projector according to any one of Appendices 1 to 7, characterized by:

(Appendix 9)
Mounted on a moving body that moves on a surface,
the projection unit projects the projection image onto the surface;
The projector according to appendix 8, characterized by:

(Appendix 10)
The imaging unit captures an image of the placement member including the marker as a marker image.
The projector according to any one of Appendices 1 to 9, characterized by:

(Appendix 11)
The control unit acquires analog information or digital information regarding an image input from an external device as the image data.
11. The projector according to any one of appendices 1 to 10, characterized by:

(Appendix 12)
a housing arranged movably with respect to a mounting member; an imaging unit arranged in the housing and capturing an image containing a marker of the mounting member as a marker image; and a projected image defined by image data. a projector that outputs a light beam;
an information processing device including a communication unit that communicates with the projector and acquires the marker image captured by the imaging unit; and a control unit,
The control unit
calculating a correction value for image correction of the image data based on a change in the position of the housing specified by the marker image acquired by the communication unit;
A projection system characterized by:

(Appendix 13)
capturing an image including the marker of the placement member as a marker image;
get the image data,
correcting the obtained image data with a correction value based on a change in the position of the housing movably arranged with respect to the mounting member, which is specified by the photographed marker image;
A correction value correction method characterized by:

(Appendix 14)
to the computer,
capturing an image including the marker of the placement member as a marker image;
get the image data,
correcting the obtained image data with a correction value based on a change in the position of the housing movably arranged with respect to the mounting member, which is specified by the photographed marker image;
A program characterized by

Reference Signs List 1 projector, 110 projection unit, 120 input unit, 130 operation unit, 140 imaging unit, 150 control unit, 151 input image data acquisition unit, 152 marker image acquisition unit, 153 angle calculation unit ( calculation unit), 154 correction unit, 155 output unit, 160 storage unit, 210 housing, 220 support unit, 230 base, 240 marker

Claims (14)

a housing arranged movably with respect to the mounting member;
a photographing unit arranged in the housing for photographing an image including a marker of the placement member as a marker image;
a control unit;
The control unit
get the image data,
performing image correction on the obtained image data with a correction value based on a change in the position of the housing specified by the marker image captured by the imaging unit;
A projector characterized by: The correction value is determined based on a change in the housing position specified by a change in the marker position on the marker image.
2. The projector according to claim 1, characterized by: The change in position of the housing is
A position of the marker included in the first marker image captured by the imaging unit at a first time point, and a second marker image captured by the imaging unit at a second time point different from the first time point. identified by a result of comparison with the position of the marker,
The control unit
performing image correction of the acquired image data with a correction value based on a change in the position of the housing;
3. The projector according to claim 1, wherein: The control unit identifies the position of the marker on the marker image by analyzing the marker image captured by the imaging unit, and determines the amount of change in the position of the housing from the change in the position of the marker. do,
4. The projector according to any one of claims 1 to 3, characterized by: wherein the control unit determines the correction value based on a change in the marker position on the marker image;
5. The projector according to any one of claims 1 to 4, characterized by: The mounting member is a pedestal for fixing the projector,
6. The projector according to any one of claims 1 to 5, characterized by: The housing is arranged to be rotatable about two axes with respect to the mounting member,
The control unit calculates at least one of a change in the elevation angle or the azimuth angle of the housing from the change in the position of the marker.
7. The projector according to any one of claims 1 to 6, characterized by: Equipped with a projection unit that outputs a projected image as light rays,
The control unit outputs the image data to the projection unit, and controls the projection unit to output the image data as the projection image.
8. The projector according to any one of claims 1 to 7, characterized by: Mounted on a moving body that moves on a surface,
the projection unit projects the projection image onto the surface;
9. The projector according to claim 8, characterized by: The imaging unit captures an image of the placement member including the marker as a marker image.
10. The projector according to any one of claims 1 to 9, characterized by: The control unit acquires analog information or digital information regarding an image input from an external device as the image data.
11. The projector according to any one of claims 1 to 10, characterized by: a housing arranged movably with respect to a mounting member; an imaging unit arranged in the housing and capturing an image containing a marker of the mounting member as a marker image; and a projected image defined by image data. a projector that outputs a light beam;
an information processing device including a communication unit that communicates with the projector and acquires the marker image captured by the imaging unit; and a control unit,
The control unit
calculating a correction value for image correction of the image data based on a change in the position of the housing specified by the marker image acquired by the communication unit;
A projection system characterized by: capturing an image including the marker of the placement member as a marker image;
get the image data,
correcting the obtained image data with a correction value based on a change in the position of the housing movably arranged with respect to the mounting member, which is specified by the photographed marker image;
A correction value correction method characterized by: to the computer,
capturing an image including the marker of the placement member as a marker image;
get the image data,
correcting the obtained image data with a correction value based on a change in the position of the housing movably arranged with respect to the mounting member, which is specified by the photographed marker image;
A program characterized by

Images