JP2023168020A - Projection device, control method, and program - Google Patents

Abstract

To allow a projection device to diffuse light at an appropriate diffusion angle.SOLUTION: A projection device of the present invention has: a light source; modulation means that modulates light emitted from the light source according to an image; diffusion means that diffuses the light modulated by the modulation means; and control means that controls the degree of diffusion of the light in the diffusion means according to the complexity of the image.SELECTED DRAWING: Figure 1

Description

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

Projection devices (such as projectors) have been proposed that have an image projection mode and an illumination mode (spotlight mode). The image projection mode is a mode for projecting an image, and the illumination mode is a mode for using projection light from a projection device as illumination light. Projection light (illumination light) in lighting mode is used for performances at stores and event venues.

In the image projection mode, a focused image (an image with no (less) blur) is projected so that the user or the like can see the image clearly. In the illumination mode, projection light is diffused to project a blurred image. In general lighting devices, by diffusing the illumination light, it is possible to achieve effects such as uniformly illuminating objects (such as products) and creating a bright or gentle atmosphere in the place. In illumination mode, by projecting a blurred image, it is possible to obtain the same effect as a general illumination device. Patent Document 1 discloses projecting a blurred image by shifting the focus of a lens.

International Publication No. 2016/147236

However, the illumination image is not necessarily an image used only for illumination, and is not necessarily a simple image such as a circle or a square. For example, in order to create an atmosphere, the lighting image may have a tablecloth pattern, a window frame pattern, or the like. For advertising purposes, lighting images may include information (character strings) such as product names and promotional phrases. For guidance, the illumination image may include information such as arrows and marks.

In the conventional illumination mode, the projection light is diffused and a blurred image is projected, so there is a possibility that the desired effect may not be obtained. For example, there is a risk that information included in the illumination image may become blurred and difficult to see. When projection is performed in the conventional image projection mode, the information included in the illumination image becomes easier to see, but since the entire illumination image is projected clearly, the illumination effect may not be obtained.

Therefore, an object of the present invention is to enable a projection device to diffuse light with a suitable degree of diffusion.

The projection apparatus of the present invention includes a light source, a modulating means for modulating the light emitted from the light source according to an image, a diffusing means for diffusing the light modulated by the modulating means, and a diffusing means for diffusing the light modulated by the modulating means. The image forming apparatus is characterized by comprising a control means for controlling the degree of diffusion according to the degree of complexity of the image.

According to the present invention, the projection device can diffuse light with a suitable degree of diffusion.

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 lighting mode processing according to the first embodiment. 3 is a diagram showing an example of an illumination image according to Example 1. FIG. 3 is a diagram showing an example of projection of an illumination image according to Example 1. FIG. 7 is a flowchart illustrating an example of lighting mode processing according to the second embodiment. 7 is a diagram showing an example of a menu image according to Example 2. FIG. 12 is a flowchart illustrating an example of lighting mode processing according to Example 3.

<Example 1>
Example 1 of the present invention will be described. FIG. 1 is a block diagram showing a configuration example of a projection apparatus 100 according to a first embodiment. In FIG. 1, thin arrows represent transmission and reception of control data (control signals), and thick arrows represent transmission and reception of image data (image signals). White arrows represent light input and output. The control unit 101, the image processing unit 106, the panel control unit 107, the image drawing unit 108, the light source control unit 109, and the complexity determination unit 112 are configured by hardware or software inside an arithmetic device such as a microcomputer.

The control unit 101 is connected to each component in the projection device 100 via a control bus, and controls each component and performs various calculation processes necessary for the operation of the projection device 100.

The storage unit 102 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 102 stores various information necessary for the operation of the projection device 100.

The operation unit 103 is composed of buttons, a control circuit, and the like. The operation unit 103 receives user operations (operations performed by the user on the projection apparatus 100), and transmits the user operations to the control unit 101. The control unit 101 controls and sets each component within the projection apparatus 100 in accordance with user operations. For example, when the user uses the operation unit 103 to select one of a plurality of modes including an image projection mode and an illumination mode (spotlight mode), the control unit 101 controls the operation of the projection apparatus 100 to match the selected mode. Set as mode. Note that the projection device 100 may include a receiving device that receives signals from an operating device such as a mouse or a remote controller, as a receiving section that receives user operations.

The image projection mode is a mode for projecting an image, and the illumination mode is a mode for using projection light of the projection device 100 (light emitted from the projection unit 114) as illumination light. For example, in the image projection mode, a focused image (an image without (less) blur) is projected so that the user or the like can clearly view the image. In the illumination mode, projection light is diffused to project a blurred image.

The communication unit 104 includes terminals of communication standards such as USB (Universal Serial Bus) and LAN (Local Area Network), processing circuits, and the like. The communication unit 104 transmits and receives data to and from an external device. In the first embodiment, it is assumed that an illumination image used in the illumination mode is acquired via the communication unit 104 and stored in the storage unit 102. The communication unit 104 may be configured by a communication device that transmits and receives data to and from an external device using a wireless LAN or the like.

The image input unit 105 is constituted by an image input circuit compatible with image communication standards such as HDMI (High-Definition Multimedia Interface) (registered trademark) and DisplayPort (registered trademark). In the first embodiment, it is assumed that the image input unit 105 acquires a projection image used in the image projection mode from outside the projection apparatus 100. Note that the image input unit 105 may acquire an illumination image (an illumination image after drawing processing).

The image processing unit 106 performs various image processing. For example, the image processing unit 106 performs keystone correction processing, scaling processing, color gamut conversion processing, brightness correction processing, and the like.

The panel control unit 107 converts the image (image data) output from the image processing unit 106 according to the input/output characteristics of the panel element unit 111. Then, the panel control section 107 controls the panel element section 111 according to the converted image.

The image drawing unit 108 performs drawing processing on various images, and outputs the image after the drawing processing to the image processing unit 106. For example, when the illumination mode is set, the image drawing unit 108 reads out the illumination image from the storage unit 102 and performs the process of drawing the illumination image. In the lighting image drawing process, the image drawing unit 108 draws the lighting image on a predetermined background image (black image). The image drawing unit 108 can also perform a drawing process of drawing a menu image (operation menu) on a projection image, an illumination image, a predetermined background image, or the like.

The light source control section 109 controls the light source section 110. For example, the light source control unit 109 switches ON/OFF (lighting/extinguishing) of the light source unit 110, and controls (changes, sets) the light emission intensity (output intensity) of the light source unit 110.

The light source section 110 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. The light source unit 110 emits light for projecting an image. Light emitted from the light source section 110 is input to the panel element section 111. The light source unit 110 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 110 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 110.

The panel element section 111 includes panels such as liquid crystal, LCOS (Liquid Crystal On Silicon), and DLP (Digital Light Processing) (registered trademark), and optical elements such as lenses and mirrors. The panel element section 111 modulates the light emitted from the light source section 110 according to the image output from the image processing section 106 (the image after conversion by the panel control section 107). For example, the panel control unit 107 converts the image output from the image processing unit 106, and controls light modulation by the panel element unit 111 according to the converted image. The panel element section 111 may have one panel or a plurality of panels. For example, the panel element section 111 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.

When the illumination mode is set, the complexity determination unit 112 reads the illumination image from the storage unit 102 and determines (calculates) the complexity of the illumination image based on the illumination image. The illumination image read by the complexity determining unit 112 is the same as the illumination image read by the image drawing unit 108. The control unit 101 controls (changes or sets) the degree of light diffusion in the diffusion unit 113 according to the complexity determined by the complexity determination unit 112. For example, when the image projection mode is set, the control unit 101 controls the degree of diffusion to the lowest value, and when the illumination mode is set, the control unit 101 controls the degree of diffusion to the lowest value according to the complexity of the illumination image. is controlled to a value higher than the minimum value.

The diffusing unit 113 diffuses the light modulated by the panel element unit 111 with a degree of diffusion controlled by the control unit 101. For example, the diffusion unit 113 uses PDLC (polymer dispersed liquid crystal) to diffuse light. PDLC is a device whose transmittance changes depending on voltage. When the voltage applied to the PDLC is gradually increased (or decreased), the state of the PDLC changes from a transparent state that transmits light to a non-transparent state that diffuses light, and the degree of light diffusion in the PDLC gradually increases. do. In this way, by controlling the voltage applied to the PDLC, the degree of light diffusion in the PDLC can be controlled. Note that the diffusing unit 113 may diffuse the light by shifting the focal position of the projection lens from the in-focus position.

The projection unit 114 is constituted by a projection lens, and outputs the light output from the diffusion unit 113 to the outside of the projection device 100.

FIG. 2 is a flowchart illustrating an example of the process (illumination mode process) of the projection apparatus 100 when the illumination mode is set. For example, when the user selects an illumination mode using the operation unit 103, the control unit 101 sets the illumination mode as the operation mode of the projection apparatus 100, and starts the illumination mode processing of FIG. 2.

In step S201, the control unit 101 controls the complexity determination unit 112 to read the illumination image from the storage unit 102.

In step S202, the control unit 101 controls the complexity determining unit 112 to determine (calculate) the complexity of the illumination image read out in step S201. The degree of complexity can be regarded as an index corresponding to the amount of information included in the illumination image. For example, the complexity determining unit 112 performs Fourier transform on the illumination image and determines the complexity according to the spatial frequency of the illumination image. In this case, the higher the spatial frequency, the higher the value determined as the complexity. The spatial frequency of the illumination image is, for example, the average spatial frequency of the illumination image or the maximum spatial frequency of the illumination image. The spatial frequency of the illumination image may be a spatial frequency corresponding to the spatial frequency component that is most included in the illumination image. The average spatial frequency of the illumination image may be obtained by performing a weighted average using a weight according to the amount of spatial frequency components included in the illumination image, or by using an arithmetic average ( It may also be obtained by performing an arithmetic mean).

Note that the complexity determining unit 112 may perform edge detection on the illumination image and determine the complexity according to the number of edges included in the illumination image. In this case, the higher the number of edges, the higher the value determined as the complexity. The complexity determining unit 112 may perform statistical detection on the illumination image and determine the complexity according to the number of types of brightness and colors included in the illumination image. In this case, a higher value is determined as the number of types of luminance increases, and a value increases as the number of types of color increases, as the degree of complexity. The complexity determining unit 112 may perform character detection on the illumination image and determine the complexity according to the number of characters included in the illumination image. In this case, the higher the number of characters, the higher the value determined as the complexity level. Various proposed methods can be used for Fourier transform, edge detection, statistics detection, and character detection.

In step S203, the control unit 101 controls the degree of light diffusion in the diffusion unit 113 according to the degree of complexity determined in step S202. The control unit 101 controls the degree of diffusion to a lower value as the degree of complexity increases. The control unit 101 may determine the degree of diffusion using a function (conversion formula) indicating the correspondence between complexity and degree of diffusion, or may determine the degree of diffusion using a table (conversion table) indicating the correspondence. You may. A plurality of tables (or functions) may be stored in advance in the storage unit 102, and the user may be able to select one of the plurality of tables (or functions) using the operation unit 103. In this case, the selected table (or function) is used to determine the degree of dispersion.

In step S204, the control unit 101 controls to project the illumination image. For example, the control unit 101 controls the image rendering unit 108 to read out the same illumination image as the illumination image read out by the complexity determination unit 112 in step S201 and perform the rendering process (illumination image rendering process). . The control unit 101 controls the light source control unit 109 to turn on the light source unit 110. The control unit 101 controls the image processing unit 106 to perform image processing on the illumination image (the illumination image after drawing processing). Furthermore, the control unit 101 converts the illumination image (the illumination image after image processing by the image processing unit 106), and controls the modulation of light by the panel element unit 111 according to the converted illumination image. Controls the panel control unit 107. In this way, the illumination image is projected from the projection unit 114. At this time, the light modulated by the panel element section 111 is diffused in the diffusion section 113 with a degree of diffusion depending on the complexity of the illumination image. Therefore, an appropriately blurred illumination image is projected depending on the complexity of the illumination image.

In step S205, the control unit 101 determines whether there has been a change in the illumination image read out by the complexity determining unit 112 or the image drawing unit 108. If the control unit 101 determines that there is a change in the illumination image, the process returns to step S202, and if the control unit 101 determines that there is no change in the illumination image, the process of step S206 is executed. . Note that if the illumination image is a moving image, it may be assumed that the illumination image does not change while the same moving image is being read out (even if there is a change in the frame). In this case, when the illumination image is switched to another moving image or still image, it is determined that there has been a change in the illumination image.

In step S206, the control unit 101 determines whether the user uses the operation unit 103 to instruct a change in the operation mode of the projection apparatus 100. If the control unit 101 determines that the user has not instructed to change the operating mode, the process returns to step S205. If the control unit 101 determines that the user has instructed to change the operation mode, the control unit 101 ends the lighting mode process of FIG. 2.

FIG. 3 shows an example of an illumination image according to the first embodiment. The illumination image in FIG. 3 is an image designed with the assumption that light (illumination light) will be applied to a mannequin wearing clothes in a show window of an apparel shop. An elliptical white area is projected as illumination. This white area includes the words "Winter Collection 2021". The outside of the ellipse is a black area. The black area is an area where no light is output from the projection unit 114 (or little light is output from the projection unit 114) and is not visible to the user. Although FIG. 3 shows a monochrome image as the illumination image, the illumination image may be a color image.

In step S201 in FIG. 2, the illumination image in FIG. 3 is read from the storage unit 102. Then, in step S202, the complexity of the illumination image shown in FIG. 3 is determined. Here, it is assumed that the degree of complexity is determined to be medium. Therefore, in step S203, the degree of light diffusion in the diffusing section 113 is controlled to be medium depending on the medium complexity. Then, in step S204, the projection unit 114 projects an illumination image as shown in FIG. 4(B).

4(A) to 4(C) show examples of projection of the illumination image (the illumination image in FIG. 3) according to the first embodiment. In FIGS. 4(A) to 4(C), illumination images are projected onto two mannequins. The gray area of the ellipse is the area illuminated by the illumination light. A rectangular area indicated by a broken line is an area onto which an illumination image is projected. Areas other than the gray area in the rectangular area correspond to black areas that are not visible to the user. Since the diffusion unit 113 diffuses the light, the illumination image is projected in a diffused manner. When the illumination image is diffused, the characters included in the illumination image are also diffused.

FIG. 4A shows a case where the degree of light diffusion in the diffusion section 113 is small. Although the characters are clear, the outline of the ellipse used for lighting is too clear, so natural lighting cannot be achieved (unnatural lighting). Note that when it is determined that the complexity of the illumination image is high, the degree of light diffusion in the diffusion unit 113 is controlled to be low.

FIG. 4B shows a case where the degree of light diffusion in the diffusion section 113 is medium. Although the characters are slightly blurred compared to FIG. 4(A), they are easily visible. The elliptical area used for lighting is also blurred, resulting in natural lighting. Note that when the complexity of the illumination image is determined to be medium, the degree of light diffusion in the diffusion unit 113 is controlled to medium.

FIG. 4C shows a case where the degree of light diffusion in the diffusion section 113 is large. The elliptical area used for lighting is blurred, providing natural lighting, but the text is too blurred and difficult to read.

In this way, in the case of the illumination image shown in FIG. 3, the state shown in FIG. 4B (a state in which natural lighting is achieved and characters can be easily recognized) is preferable. In the first embodiment, in the case of the illumination image shown in FIG. 3, it is determined that the complexity of the illumination image is medium, and the degree of light diffusion in the diffusion unit 113 is controlled to be medium. As a result, projection as shown in FIG. 4(B) can be performed.

As described above, according to the first embodiment, the projection device can diffuse light with a suitable degree of diffusion. For example, by controlling the degree of diffusion of the projection light according to the complexity of the illumination image, it is possible to achieve suitable illumination (e.g., natural illumination) and to make the information in the illumination image easily visible. It can be realized.

<Example 2>
Example 2 of the present invention will be described. In the first embodiment, an example has been described in which the projection device determines the complexity of the illumination image and controls the degree of diffusion of the projection light according to the complexity. In the second embodiment, an example will be described in which the degree of diffusion of projection light is controlled in accordance with a user's operation. The configuration of the projection device according to the second embodiment is the same as that of the first embodiment.

FIG. 5 is a flowchart illustrating an example of lighting mode processing according to the second embodiment. For example, when the user selects the illumination mode using the operation unit 103, the control unit 101 sets the illumination mode as the operation mode of the projection apparatus 100, and starts the illumination mode processing of FIG. 5.

In step S501, the control unit 101 controls to project an illumination image. At this time, the degree of light diffusion in the diffusion section 113 is controlled to an initial value. A predetermined fixed value may be used as the initial value (initial value of the degree of diffusion), or a previously used value may be stored and the previously used value may be used as the initial value. The value determined by the method of Example 1 (the degree of diffusion depending on the complexity of the illumination image) may be used as the initial value.

In step S502, the control unit 101 prompts the user to specify the degree of light diffusion in the diffusion unit 113. For example, the control unit 101 controls to display the menu image shown in FIG. 6. The user can instruct changes in the degree of diffusion using the direction keys included in the operation unit 103. When the user instructs to change the degree of diffusion, the control unit 101 controls (changes) the degree of diffusion of light in the diffusion unit 113 in accordance with the instruction.

In step S503, the control unit 101 controls to project the illumination image. This process is similar to the process in step S204 in FIG.

In step S504, the control unit 101 determines whether the user operation (specifying the degree of light diffusion in the diffusion unit 113) is completed. For example, the control unit 101 controls the control unit 101 when a user operation to instruct completion of specifying the degree of diffusion (such as a user operation to hide the menu image in FIG. 6) or when a predetermined period of time has elapsed without any operation. , determines that the user operation is complete. If the control unit 101 determines that the user operation has been completed, the process of step S505 is executed. If the control unit 101 determines that the user operation has not been completed, the process returns to step S502.

The processing in steps S505 and S506 is similar to the processing in steps S205 and S206 in FIG.

As described above, according to the second embodiment, the user can determine the degree of diffusion of the illumination image (the degree of diffusion of projection light) while viewing the projected illumination image. In turn, it is possible to realize a state that more closely matches the user's preferences (improvement of convenience).

Although an example in which the user specifies the degree of diffusion has been described, the user may specify a value different from the degree of diffusion, and the control unit 101 may determine the degree of diffusion according to the specified value. For example, the user may specify the complexity of the illumination image.

<Example 3>
Example 3 of the present invention will be described. In the third embodiment, an example will be described in which a value related to the degree of diffusion of an illumination image is associated with the illumination image in advance. The configuration of the projection device according to the third embodiment is the same as that of the first embodiment.

FIG. 7 is a flowchart illustrating an example of lighting mode processing according to the third embodiment. For example, when the user selects the illumination mode using the operation unit 103, the control unit 101 sets the illumination mode as the operation mode of the projection apparatus 100, and starts the illumination mode processing of FIG. 7.

In step S701, the control unit 101 controls the complexity determination unit 112 to read the illumination image from the storage unit 102. This process is similar to the process in step S201 in FIG.

In step S702, the control unit 101 reads from the storage unit 102 the degree of diffusion associated in advance with the illumination image read out in step S701. Then, the control unit 101 controls the degree of diffusion of light in the diffusion unit 113 based on the read degree of diffusion (setting the degree of diffusion).

The process in step S703 is similar to the process in step S204 in FIG. The process in step S704 is similar to the process in step S205. The process in step S705 is similar to the process in step S206.

The degree of diffusion associated with the illumination image in advance is, for example, the degree of diffusion according to the complexity of the illumination image, and is determined when the illumination image is created. Assuming that a value of 0 or more and 100 or less can be set as the degree of diffusion, in the case of a simple round illumination image, the degree of diffusion = 100 is determined so that natural illumination can be achieved. In the case of the illumination image in Figure 3, since the illumination image includes characters, the degree of diffusion = 50 is determined so that natural illumination can be achieved and the characters can be easily recognized. Ru. In the case of an illumination image with a larger number of characters or a smaller size of characters than the illumination image of FIG. 3, the degree of diffusion=30 is determined with priority given to the visibility of the characters.

As described above, according to the third embodiment, the value related to the degree of diffusion of the illumination image is associated in advance with the illumination image. Then, the degree of light diffusion in the diffusion section 113 is controlled according to the value associated in advance. This eliminates the need to judge the complexity of the illumination image when projecting the illumination image, and it is possible to obtain the same effects as in the first embodiment with less processing load than in the first embodiment.

Although an example has been described in which the degree of diffusion is associated with the illumination image in advance, a value different from the degree of diffusion is associated with the image for illumination in advance, and the control unit 101 controls the diffusion rate according to the value associated in advance. The degree may be determined. For example, the complexity of the illumination image may be associated with the illumination image in advance.

It should be noted that Examples 1 to 3 (including modified examples) are merely examples, and configurations obtained by appropriately modifying or changing the configurations of Examples 1 to 3 within the scope of the gist of the present invention may also be used. Included in the present invention. The present invention also includes configurations obtained by appropriately combining the configurations of Examples 1 to 3.

<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)
a light source and
Modulating means for modulating the light emitted from the light source according to an image;
Diffusion means for diffusing the light modulated by the modulation means;
A projection apparatus comprising: control means for controlling the degree of diffusion of the light in the diffusion means according to the complexity of the image.
(Configuration 2)
The projection apparatus according to configuration 1, wherein the control means controls the degree of diffusion to a lower value as the degree of complexity is higher.
(Configuration 3)
The projection device according to configuration 1 or 2, wherein the degree of complexity increases as the spatial frequency of the image increases.
(Configuration 4)
The projection device according to any one of configurations 1 to 3, wherein the degree of complexity increases as the number of edges included in the image increases.
(Configuration 5)
5. The projection device according to any one of configurations 1 to 4, wherein the degree of complexity increases as the number of types of luminance included in the image increases.
(Configuration 6)
6. The projection device according to any one of configurations 1 to 5, wherein the degree of complexity increases as the number of types of colors included in the image increases.
(Configuration 7)
7. The projection device according to any one of configurations 1 to 6, wherein the degree of complexity increases as the number of characters included in the image increases.
(Configuration 8)
8. The projection apparatus according to any one of configurations 1 to 7, wherein the control means controls the degree of diffusion in accordance with the degree of complexity and then in response to a user's operation.
(Configuration 9)
9. The projection apparatus according to configuration 8, wherein the user operation is an operation for specifying a degree of diffusion of the light in the diffusion means or a degree of complexity of the image.
(Configuration 10)
10. The projection apparatus according to any one of configurations 1 to 9, further comprising determining means for determining the degree of complexity based on the image.
(Configuration 11)
10. The projection apparatus according to any one of configurations 1 to 9, wherein the control means controls the degree of diffusion according to a value associated with the image in advance.
(Configuration 12)
12. The projection device according to configuration 11, wherein the value associated with the image in advance is the degree of complexity or a degree of diffusion depending on the degree of complexity.
(Configuration 13)
The control means includes:
setting one of a plurality of modes including a projection mode and an illumination mode as an operation mode of the projection device;
13. The projection device according to any one of configurations 1 to 12, wherein when the illumination mode is set, the degree of diffusion is controlled according to the degree of complexity.
(Method)
A method for controlling a projection apparatus comprising a light source, a modulating means for modulating light emitted from the light source according to an image, and a diffusing means for diffusing the light modulated by the modulating means, the method comprising:
A control method comprising the step of controlling the degree of diffusion of light in the diffusion means according to the complexity of the image.
(program)
A program for causing a computer to function as each means of the projection apparatus according to any one of Configurations 1 to 13.

100: Projection device 101: Control section 110: Light source section 111: Panel element section 113: Diffusion section

Claims (15)

a light source and
Modulating means for modulating the light emitted from the light source according to an image;
Diffusion means for diffusing the light modulated by the modulation means;
A projection apparatus comprising: control means for controlling the degree of diffusion of the light in the diffusion means according to the complexity of the image. The projection apparatus according to claim 1, wherein the control means controls the degree of diffusion to a lower value as the degree of complexity is higher. The projection device according to claim 1, wherein the degree of complexity increases as the spatial frequency of the image increases. The projection apparatus according to claim 1, wherein the degree of complexity increases as the number of edges included in the image increases. The projection device according to claim 1, wherein the degree of complexity increases as the number of types of luminance included in the image increases. The projection apparatus according to claim 1, wherein the degree of complexity increases as the number of types of colors included in the image increases. The projection device according to claim 1, wherein the degree of complexity increases as the number of characters included in the image increases. 2. The projection apparatus according to claim 1, wherein the control means controls the degree of diffusion according to the degree of complexity and then according to a user's operation. 9. The projection apparatus according to claim 8, wherein the user operation is an operation for specifying a degree of diffusion of the light in the diffusion means or a degree of complexity of the image. The projection apparatus according to claim 1, further comprising determining means for determining the degree of complexity based on the image. The projection apparatus according to claim 1, wherein the control means controls the degree of diffusion according to a value associated with the image in advance. 12. The projection apparatus according to claim 11, wherein the value associated with the image in advance is the degree of complexity or a degree of diffusion depending on the degree of complexity. The control means includes:
setting one of a plurality of modes including a projection mode and an illumination mode as an operation mode of the projection device;
2. The projection apparatus according to claim 1, wherein when the illumination mode is set, the degree of diffusion is controlled according to the degree of complexity.
A method for controlling a projection apparatus comprising a light source, a modulating means for modulating light emitted from the light source according to an image, and a diffusing means for diffusing the light modulated by the modulating means, the method comprising:
A control method comprising the step of controlling the degree of diffusion of light in the diffusion means according to the complexity of the image. A program for causing a computer to function as each means of the projection apparatus according to any one of claims 1 to 13.

Images