JP2023177518A - Control device, projection device, control method, and program - Google Patents

Abstract

To project an illuminating image without making a projectable area of the illuminating image narrower than the original projectable area on a projection device even after correcting for distortions.SOLUTION: A control device has setting means for setting one of a plurality of modes including a first mode and a second mode, correcting means for correcting distortions in an image, and controlling means for controlling a projection device to project a first image when in the first mode and controlling the projection device to project a third image with a second image superimposed on a portion of the third image when in the second mode. The correcting means corrects the distortion of the first image when in the first mode and corrects the distortion of the second image portion in the third image when in the second mode.SELECTED DRAWING: Figure 2

Description

The present invention relates to a projection device having an illumination function.

A projection device (hereinafter referred to as an illumination type projector) that can be used as an illumination device has been proposed. An illumination type projector has a projection mode in which an image is projected like a normal projector, and an illumination mode in which the image is projected as illumination light. In the projection mode, the illumination type projector projects images such as a projected image (including a projected OSD (on-screen display) image) without trapezoidal distortion. In the illumination mode, the illumination type projector projects an image so that the illumination device (for example, a spotlight) illuminates a place that the user wants to illuminate. For example, an illumination type projector projects an illumination image toward an exhibit such as a museum or a showroom.

Patent Document 1 discloses that after distortion correction for projection position alignment of an illumination image (illumination image) and trapezoidal correction of an OSD image are performed in separate distortion correction units, the illumination image is combined with the OSD image. A technique for projecting images is disclosed.

Japanese Patent Application Publication No. 2018-155899

However, in the technique disclosed in Patent Document 1, by performing distortion correction on the illumination image, the projectable area of the illumination image becomes narrower than the original projectable area of the projector.

Therefore, an object of the present invention is to project an illumination image without making the projectable area of the illumination image narrower than the original projectable area of the projection device even if distortion correction is performed.

The control device of the present invention includes: a setting means for setting one of a plurality of modes including a first mode and a second mode; a correction means for correcting image distortion; control means for controlling the projection device to project a first image and, in the case of the second mode, to project a third image on which the second image is partially superimposed. The correction means corrects the distortion of the first image in the case of the first mode, and corrects the distortion of the second image in the third image in the case of the second mode. It is characterized by correcting the distortion of.

According to the present invention, an illumination image can be projected without making the projectable area of the illumination image narrower than the original projectable area of the projection device even if distortion correction is performed.

FIG. 3 is a diagram for explaining an example of an operation mode of the projection device according to the first embodiment. 1 is a block diagram showing a configuration example of a projection device according to a first embodiment. FIG. 5 is a flowchart illustrating an example of image generation processing according to the first embodiment. FIG. 3 is a diagram showing an example of distortion correction according to the first embodiment. 3 shows an example of a projected image according to the first embodiment. FIG. 2 is a block diagram showing a configuration example of a projection device according to a second embodiment. 7 is a flowchart illustrating an example of image generation processing according to the second embodiment.

<Example 1>
Example 1 of the present invention will be described below. 1(a) and 1(b) are diagrams for explaining an example of the operation mode of the projection apparatus 100 according to the first embodiment.

The projection apparatus 100 when the operation mode is the normal projection mode (first mode, projection mode) will be described with reference to FIG. 1(a). The normal projection mode is a mode for projecting images. In the normal projection mode, the projection device 100 projects an input image onto the screen 101, for example. The input image is projected with trapezoidal distortion corrected.

Next, with reference to FIG. 1(b), the projection apparatus 100 when the operation mode is the illumination mode (second mode) will be described. The illumination mode is a mode for using projection light of the projection device 100 (light emitted from the projection unit 214 described later) as illumination light. In the lighting mode, the projection device 100 functions as a lighting device by projecting a composite lighting image (an image obtained by combining a background image and a lighting image) 102 onto, for example, a floor surface, a wall surface, a work of art, an exhibit, or the like. The composite illumination image 102 includes, for example, a circular illumination image, and the user can use the projection device 100 like a spotlight by causing the projection device 100 to project the composite illumination image 102. Furthermore, in order to make the grid pattern of the liquid crystal panel (panel element section 213 described later) not visible (inconspicuous) in the composite illumination image 102, the projection device 100 diffuses the projection light with a diffuser plate and projects the image.

The user switches the operation mode of the projection device 100 between the normal projection mode and the illumination mode depending on the situation. Projection device 100 projects an image according to the operation mode. Note that the number of operation modes of the projection device 100 is not limited to two, and the projection device 100 may have three or more operation modes.

FIG. 2 is a block diagram showing a configuration example of the projection device 100 according to the first embodiment. The projection device 100 is a projector that projects an image based on input image data (image signal) or internally stored image data. The projection device 100 includes an operation reception section 200, a control section 201, a storage section 202, an image input section 203, an illumination image reading section 204, an image selection section 205, a distortion correction section 206, a background image reading section 207, a composition section 208, and an image It includes a processing unit 209. The projection apparatus 100 also includes a panel control section 210, a light source control section 211, a light source section 212, a panel element section 213, a projection section 214, and a bus 215.

The operation reception unit 200 is configured with various operation buttons, a touch panel, and the like. The operation reception unit 200 accepts user operations (operations performed by the user on the projection apparatus 100), and transmits information corresponding to the user operations to the control unit 201. For example, the control unit 201 sets one of a plurality of operation modes in response to a user operation received by the operation reception unit 200. The operation receiving unit 200 may be a receiving unit that receives information from an operating device such as a remote controller.

The control unit 201 is connected to each component of the projection device 100 via a bus 215, and controls each component and performs various calculation processes necessary for the operation of the projection device 100.

The storage unit 202 includes a storage device such as a RAM (Random Access Memory), an SSD (Solid State Drive), or an HDD (Hard Disk Drive). The storage unit 202 stores various information necessary for the operation of the projection device 100. Furthermore, the storage unit 202 stores drawing planes for illumination images and background images. Furthermore, the storage unit 202 stores image data of an illumination image and image data of a background image.

The image input unit 203 acquires an input image (first image) from outside the projection device 100. The image input unit 203 is configured with an image input circuit compatible with image communication standards such as HDMI (High-Definition Multimedia Interface) (registered trademark) and USB (Universal Serial Bus). The input image is, for example, an image generated in accordance with the resolution of the projection device 100 (panel resolution of the panel element section 213). If the resolution of the input image and the resolution of the projection device 100 are different, the image input unit 203 converts the resolution of the input image to match the resolution of the projection device 100. Note that the projection device 100 may include a resolution conversion unit that converts the resolution of the input image to match the resolution of the projection device 100. Further, the input image may be stored in the storage unit 202 in advance.

The illumination image reading unit 204 reads the illumination image (second image) from the storage unit 202. The illumination image is an image of a portion of the composite illumination image (third image) onto which the illumination device is projected so as to illuminate an object or space. The illumination image has any shape, such as a spotlight shape (eg, circular). In the illumination mode, the projection device 100 projects a composite illumination image in which the illumination images are partially superimposed. The illumination image reading unit 204 reads out an image stored in the storage unit 202 (for example, an image that is a base for a spotlight) and outputs it to the image selection unit 205. Images of a plurality of shapes such as circles, squares, and polygons are stored in advance in the storage unit 202, and the user can specify an illumination image using the operation reception unit 200. The illumination image may be acquired by the image input unit 203 or may be generated within the projection device 100. The composite illumination image may be acquired by the image input unit 203 or may be stored in the storage unit 202.

The image selection unit 205 selects an image to be subjected to distortion correction processing by the distortion correction unit 206. In response to the user operation received by the operation reception unit 200, the image selection unit 205 selects the input image output from the image input unit 203 or the illumination image output from the illumination image reading unit 204, and sends the selected image to the distortion correction unit 206. Output.

The distortion correction unit 206 performs image distortion correction processing by changing the amount of distortion correction according to the operation mode. The distortion correction process is performed using, for example, projective transformation. In the case of the normal projection mode, the distortion correction unit 206 performs distortion correction processing on the input image output from the image input unit 203 using a first distortion correction amount, which will be described later. image). In addition, in the case of illumination mode, the distortion correction unit 206 performs distortion correction processing on the illumination image output from the illumination image reading unit 204 using a second distortion correction amount to be described later, and generates a distortion-corrected image. do. The distortion correction unit 206 outputs the generated distortion-corrected image to the synthesis unit 208. Here, the first distortion correction amount is a parameter for projective transformation that performs trapezoidal correction of the input image. Further, the second distortion correction amount is a parameter for projective transformation that performs trapezoidal correction of the illumination image. The second distortion correction amount varies depending on the position or size of the illumination image in the composite illumination image. The distortion correction unit 206 uses the second distortion correction amount to perform distortion correction processing specific to the illumination image portion in the composite illumination image. Since the first distortion correction amount corrects the distortion of the entire input image on average, in the area of the illumination image, the accuracy of the distortion correction processing when using the second distortion correction amount is higher than when using . Note that the first distortion correction amount and the second distortion correction amount are adjusted in advance and stored in the storage unit 202.

The background image reading unit 207 reads the background image (fourth image) from the storage unit 202. The background image is an image for generating a composite illumination image (third image) in the illumination mode. The background image is, for example, a black image. In the illumination mode, even if there is no input image, it is necessary to drive the panel element section 213, which will be described later, to project an image. generated. Note that the background image may be acquired by the image input unit 203 or may be generated within the projection device 100.

The combining unit 208 combines the illumination image with the background image in the illumination mode. Specifically, the combining unit 208 generates a composite illumination image by superimposing (combining) the illumination image corrected by the distortion correction unit 206 on a part of the background image. The combining unit 208 outputs the combined illumination image to the image processing unit 209. In the case of the normal projection mode, the synthesis unit 208 outputs the input image corrected by the distortion correction unit 206 to the image processing unit 209.

The image processing unit 209 performs various image processing on the image output from the composition unit 208. For example, the image processing unit 209 performs scaling processing, color gamut conversion processing, brightness correction processing, and the like. If the resolution of the input image after the distortion correction process is different from the resolution of the projection apparatus 100, the image processing unit 209 adds a black area so that the resolution of the input image after the distortion correction process matches the resolution of the projection apparatus 100. .

The panel control section 210 controls the panel element section 213. Furthermore, the panel control unit 210 converts the image (image data) output from the image processing unit 209 according to the input/output characteristics of the panel element unit 213.

The light source control section 211 controls the light source section 212. For example, the light source control unit 211 switches ON/OFF (lighting/extinguishing) of the light source unit 212, and controls (changes, sets) the light emission intensity (output intensity) of the light source unit 212.

The light source unit 212 emits light for projecting an image. The light source section 212 includes a light source such as a lamp, an LED (Light Emitting Diode), or a laser, and an optical element such as a lens or mirror. Light emitted from the light source section 212 is input to the panel element section 213. The light source section 212 may include a light source that emits red light, a light source that emits green light, and a light source that emits blue light. The light source section 212 may have one light source that emits white light, or may have a plurality of light sources. The light source section 212 may include a light source that emits white light and a color wheel for switching the color of light emitted from the light source section 212.

The panel element section 213 includes panels such as liquid crystal, LCOS (Liquid Crystal On Silicon), DLP (Digital Light Processing) (registered trademark), and optical elements such as lenses and mirrors. The panel element section 213 may include a panel that modulates the red component of light, a panel that modulates the green component of light, and a panel that modulates the blue component of light. The panel element section 213 may have one panel or a plurality of panels. The panel element section 213 modulates the light emitted from the light source section 212 according to image data.

The projection unit 214 is configured with a projection lens, and projects the light output from the panel element unit 213 to the outside of the projection device 100.

Next, the processing (image generation processing) of the projection apparatus 100 according to the first embodiment will be explained using the flowchart of FIG. 3. The image generation process is repeatedly executed by the control unit 201 while the projection apparatus 100 is powered on.

In step S301, the control unit 201 determines whether the currently set operation mode is the lighting mode. If the control unit 201 determines that the mode is illumination mode, the process of step S302 is executed, and if the control unit 201 determines that it is not the illumination mode (normal projection mode), the process of step S307 is executed. .

Steps S302 to S306 are processing in the lighting mode. FIGS. 4A and 4B are diagrams for explaining a process (distortion correction process) for correcting trapezoidal distortion of an illumination image in the illumination mode.

In step S302, the control unit 201 controls the illumination image reading unit 204 to read the illumination image 400 from the storage unit 202 and output it to the image selection unit 205. The illumination image 400 in FIG. 4(a) is an example of an illumination image, and is a circular image.

In step S303, the control unit 201 controls the background image reading unit 207 to read the background image 402 from the storage unit 202 and output it to the compositing unit 208. A background image 402 in FIG. 4B is an example of a background image, and is an image generated in accordance with the resolution of the projection device 100.

In step S304, the control unit 201 controls the image selection unit 205 to select the illumination image 400 and output it to the distortion correction unit 206.

In step S305, the control unit 201 controls the distortion correction unit 206 to perform distortion correction processing on the illumination image 400 using the second distortion correction amount. The distortion correction unit 206 outputs the illumination image 401 after distortion correction processing to the synthesis unit 208.

In step S306, the control unit 201 controls the synthesis unit 208 to generate a composite illumination image in which the illumination image 401 after the distortion correction process is combined with a part of the background image 402 that has not undergone the distortion correction process. .

FIG. 5A is a diagram illustrating an example of a composite illumination image projected in illumination mode. The projection region 500 (region outside the projection region 501) is a projection region of a portion corresponding to the background image 402 out of the projection region of a composite illumination image generated by combining the illumination image 401 with the background image 402. Note that when the background image 402 is a black image, the projection area 500 is not visible to the user. The projection area 500 includes a projection area 501 of the illumination image 401 after distortion correction processing. The illumination image 401 after the distortion correction process is projected with trapezoidal distortion corrected, as shown in the projection area 501. Since the illumination image 401 is combined with a part of the background image 402, it can be projected only within the region onto which the background image 402 is projected (within the projection region 500). Since the background image 402 is not subjected to distortion correction processing, trapezoidal distortion is not corrected as shown in the projection area 500, but it is projected onto the entire projectable area 503 of the projection device 100. Therefore, the projection device 100 can project the illumination image 401 using the entire projectable area 503. In this way, the projection apparatus 100 can project the illumination image 401 without making the projectable area of the illumination image 401 narrower than the original projectable area 503 of the projection apparatus 100 even after performing distortion correction.

Returning to the explanation of FIG. 3. Steps S307 and S308 are processes in the normal projection mode.

In step S307, the control unit 201 controls the image selection unit 205 to select the input image and output it to the distortion correction unit 206.

In step S308, the control unit 201 controls the distortion correction unit 206 to perform distortion correction processing on the input image using the first distortion correction amount.

FIG. 5B is a diagram showing an example of an input image projected in the normal projection mode. The projection area 502 of the input image after the distortion correction process has trapezoidal distortion corrected. Due to the distortion correction process, the projection area 502 is smaller in size than the projectable area 503, and the image projection area is limited. On the other hand, in the illumination mode, distortion correction processing is not performed on the background image 402, and the projection area of the image is not limited. Therefore, the area onto which the composite illumination image is projected is wider than the projection area 502 of the input image.

This completes the image generation process according to the first embodiment. The projection apparatus 100 maintains projection in the currently set operation mode until the operation reception unit 200 receives a user operation to change the operation mode.

Note that the illumination image may be a graphic, for example. The illumination image may include figures, characters, and the like. The illumination image may include a logo, a pattern image, and the like.

Further, the image generation process according to the first embodiment may be executed by a control device separate from the projection device. In this case, the control device controls the projection device to project the input image or the composite illumination image.

As described above, by combining the distortion-corrected illumination image with the undistorted background image, the projection apparatus 100 can convert the projectable area of the illumination image 401 into the original projectable area 503 of the projection apparatus 100. It becomes possible to project the illumination image 401 without making the area narrower.

<Example 2>
In the first embodiment, the projection device 100 having one distortion correction section has been described, but in the second embodiment, a projection device 600 having two distortion correction sections will be described. Note that, among the configurations of the projection device 600, descriptions of configurations that overlap with those in the first embodiment will be omitted.

FIG. 6 is a block diagram showing a configuration example of a projection device 600 according to the second embodiment. The image selection unit 601 selects the input image (first image) output from the image input unit 203 or the background image (fourth image) output from the background image reading unit 207 according to the user operation received by the operation reception unit 200. image) and outputs it to the first distortion correction unit 602.

The first distortion correction unit 602 performs distortion correction processing on the input image output from the image selection unit 601 in the normal projection mode, and outputs the input image after the distortion correction processing to the synthesis unit 604. In the case of illumination mode, the first distortion correction section 602 outputs the background image output from the image selection section 601 to the composition section 604.

The second distortion correction unit 603 performs distortion correction processing on the illumination image (second image) output from the illumination image reading unit 204 and outputs the illumination image after the distortion correction processing to the composition unit 604.

In the lighting mode, the combining unit 604 generates a composite lighting image by superimposing the lighting image output from the second distortion correction unit 603 on a part of the background image output from the first distortion correction unit 602. do. The combining unit 604 outputs the combined illumination image to the image processing unit 209. In the case of the normal projection mode, the synthesis unit 604 outputs the input image output from the first distortion correction unit 602 to the image processing unit 209.

Next, the processing (image generation processing) of the projection device 600 according to the second embodiment will be explained using the flowchart of FIG. The image generation process is performed while the projection device 600 is powered on.
This is repeatedly executed by the control unit 201.

The processing in steps S701 to S703 is the same as the processing in steps S301 to S303 in FIG. Steps S702 to S707 are processes in the lighting mode.

In step S704, the control unit 201 controls the image selection unit 601 to select the background image 402 and output it to the first distortion correction unit 602.

In step S705, the control unit 201 controls the first distortion correction unit 602 so as not to perform distortion correction processing on the background image 402.

In step S706, the control unit 201 controls the second distortion correction unit 603 to perform distortion correction processing on the illumination image 400 using the second distortion correction amount. The second distortion correction unit 603 outputs the illumination image 401 after distortion correction processing to the synthesis unit 604.

In step S707, the control unit 201 generates a composite illumination image (third image) in which the illumination image 401 after the distortion correction process is combined with a part of the background image 402 that has not undergone the distortion correction process. Controls the combining unit 604.

Steps S708 and S709 are processes in the normal projection mode.

In step S708, the control unit 201 controls the image selection unit 601 to select the input image and output it to the first distortion correction unit 602.

In step S709, the control unit 201 controls the first distortion correction unit 602 to perform distortion correction processing on the input image using the first distortion correction amount.

This completes the image generation process according to the second embodiment. The projection device 600 maintains projection in the currently set operation mode until the operation reception unit 200 receives a user operation to change the operation mode.

Note that in the illumination mode, the image selection unit 601 may select the input image instead of the background image 402 in step S704. When the input image is selected by the image selection unit 601, in step S705, the control unit 201 controls the first distortion correction unit 602 so as not to perform distortion correction processing on the input image. Then, in step S707, the control unit 201 controls the combining unit 604 to combine the illumination image 401 after the distortion correction process with the part of the input image that has not undergone the distortion correction process. In this way, even when the input image is used instead of the background image as the fourth image, the projection device 600 (projection device 100) similarly projects the illumination image 401 using the entire projectable area 503. be able to.

The distortion correction unit 206 of the first embodiment performs distortion correction processing on the entire input image in the normal projection mode, performs distortion correction processing on the illumination image portion in the composite illumination image in the illumination mode, and corrects distortion on the portion other than the illumination image portion. No correction. The first distortion correction unit 602 and the second distortion correction unit 603 of the second embodiment only need to be able to switch whether or not to perform distortion correction processing, respectively. Therefore, the distortion correction section (the first distortion correction section 602 and the second distortion correction section 603, respectively) of the second embodiment may have a simpler configuration than the distortion correction section 206 of the first embodiment. By using a distortion correction section with a simple configuration instead of using a distortion correction section with a complicated configuration (high performance), it is expected that the cost of the projection apparatus can be reduced.

As described above, by combining the distortion-corrected illumination image with the undistorted background image, the projection device 600 can convert the projectable area of the illumination image 401 into the original projectable area 503 of the projection device 600. It becomes possible to project the illumination image 401 without making the area narrower.

It should be noted that Examples 1 and 2 (including modified examples) are merely examples, and configurations obtained by appropriately modifying or changing the configurations of Examples 1 and 2 within the scope of the gist of the present invention. Included in the present invention. A configuration obtained by appropriately combining the configurations of Examples 1 and 2 is also included in the present invention.

For example, in Examples 1 and 2, the control unit 201 combines the illumination image after distortion correction processing with the background image, but after combining the illumination image with the background image, ) distortion correction processing may be performed. Furthermore, in the first and second embodiments, the control unit 201 combines one illumination image with the background image, but may combine a plurality of illumination images with the background image. When combining multiple illumination images with a background image, the second distortion correction amount may be a different value for each illumination image depending on the position or size of the illumination image in the composite illumination image, or may be the same value. There may be.

<Other Examples>
The present invention provides a system or device with a program that implements one or more of the functions of the above-described embodiments via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. This can also be achieved by processing. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

The disclosure of this embodiment includes the following configuration, method, and program.
(Configuration 1)
Setting means for setting one of a plurality of modes including a first mode and a second mode;
a correction means for correcting image distortion;
In the case of the first mode, the projection device projects a first image, and in the case of the second mode, the projection device projects a third image partially overlaid with the second image. and a control means for controlling the
The correction means corrects the distortion of the first image in the first mode, and corrects the distortion of the second image in the third image in the second mode. A control device characterized by correcting.
(Configuration 2)
The control device according to configuration 1, wherein the setting means sets one of the plurality of modes according to a user operation.
(Configuration 3)
3. The control device according to configuration 1 or 2, wherein the first image is an image input from the outside.
(Configuration 4)
In the case of the second mode, the second image corrected by the correction means is superimposed on a part of the fourth image generated in accordance with the resolution of the projection device, and the third image is 4. The control device according to any one of configurations 1 to 3, further comprising a generating means for generating.
(Configuration 5)
The control device according to configuration 4, wherein the fourth image is a black image or the first image.
(Configuration 6)
6. The control device according to any one of configurations 1 to 5, wherein the resolution of the third image is the same as the resolution of the projection device.
(Configuration 7)
7. The control device according to any one of configurations 1 to 6, wherein the first mode is a projection mode, and the second mode is an illumination mode.
(Configuration 8)
The correction means is characterized in that the image distortion is corrected using a first distortion correction amount in the first mode and a second distortion correction amount in the second mode. The control device according to any one of Configurations 1 to 7.
(Configuration 9)
The correction means is
a first correction means for correcting distortion of the first image in the case of the first mode;
Any one of configurations 1 to 8, further comprising a second correction means for correcting distortion of a portion of the second image in the third image in the case of the second mode. The control device described in .
(Configuration 10)
10. The control device according to any one of configurations 1 to 9, wherein the correction means corrects image distortion by performing trapezoidal correction.
(Configuration 11)
According to any one of configurations 1 to 10, the correction means does not correct distortion in a portion of the third image other than the second image in the second mode. control device.
(Configuration 12)
12. The control device according to any one of configurations 1 to 11, wherein an area onto which the third image is projected is wider than an area onto which the first image is projected.
(Configuration 13)
13. The control device according to any one of configurations 1 to 12, wherein the second image includes a figure or a character.
(Configuration 14)
The control device according to any one of Configurations 1 to 13;
1. A projection device comprising: projection means for projecting an image.
(Method)
a setting step of setting one of a plurality of modes including a first mode and a second mode;
a correction step for correcting image distortion;
In the case of the first mode, the projection device projects a first image, and in the case of the second mode, the projection device projects a third image partially overlaid with the second image. a control step to control the
has
In the correction step, in the case of the first mode, the distortion of the first image is corrected, and in the case of the second mode, the distortion of the part of the second image in the third image is corrected. A control method characterized by correcting.
(program)
A program for causing a computer to function as each means of the control device according to any one of Configurations 1 to 13.

201: Control unit 206: Distortion correction unit

Claims (16)

Setting means for setting one of a plurality of modes including a first mode and a second mode;
a correction means for correcting image distortion;
In the case of the first mode, the projection device projects a first image, and in the case of the second mode, the projection device projects a third image partially overlaid with the second image. and a control means for controlling the
The correction means corrects the distortion of the first image in the first mode, and corrects the distortion of the second image in the third image in the second mode. A control device characterized by correcting. The control device according to claim 1, wherein the setting means sets one of the plurality of modes according to a user operation. The control device according to claim 1, wherein the first image is an image input from the outside. In the case of the second mode, the second image corrected by the correction means is superimposed on a part of the fourth image generated in accordance with the resolution of the projection device, and the third image is The control device according to claim 1, further comprising generating means for generating. The control device according to claim 4, wherein the fourth image is a black image or the first image. The control device according to claim 1, wherein the resolution of the third image is the same as the resolution of the projection device. The control device according to claim 1, wherein the first mode is a projection mode and the second mode is an illumination mode. The correction means is characterized in that the image distortion is corrected using a first distortion correction amount in the first mode and a second distortion correction amount in the second mode. The control device according to claim 1. The correction means is
a first correction means for correcting distortion of the first image in the case of the first mode;
2. The control device according to claim 1, further comprising a second correction means for correcting distortion of a portion of the second image in the third image in the case of the second mode. The control device according to claim 1, wherein the correction means corrects image distortion by performing trapezoidal correction. 2. The control device according to claim 1, wherein the correcting means does not correct distortion in a portion of the third image other than the second image in the second mode. The control device according to claim 1, wherein an area onto which the third image is projected is wider than an area onto which the first image is projected. The control device according to claim 1, wherein the second image includes graphics or characters. A control device according to any one of claims 1 to 13,
1. A projection device comprising: projection means for projecting an image. a setting step of setting one of a plurality of modes including a first mode and a second mode;
a correction step for correcting image distortion;
In the case of the first mode, the projection device projects a first image, and in the case of the second mode, the projection device projects a third image partially overlaid with the second image. and a control step for controlling the
In the correction step, in the case of the first mode, the distortion of the first image is corrected, and in the case of the second mode, the distortion of the part of the second image in the third image is corrected. A control method characterized by correcting. A program for causing a computer to function as each means of the control device according to any one of claims 1 to 13.

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