Projection device, projection method, control device, and control program

Abstract

To provide a projection apparatus, a projection method, a control apparatus, and a control program capable of facilitating an instruction operation of geometric processing.SOLUTION: A projection apparatus 10 comprises: a projection unit which projects a projection image 5a generated by a display element based on an input image 5; and a processor. In a case of performing geometric processing of the projection image 5a in a non-display area 52 excepting a display area 51 of the projection image 5a out of a displayable area 50 of the display element, the processor performs control to project an assist image 7 indicating at least a portion of the displayable area 50 from the projection part.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a projection device, a projection method, a control device, and a control program. [Background technology]

[0002] Patent document 1 describes a projector that generates image data for display by adding visual effects to input image data, and displays an image based on the input image data, with the rest of the image being a black background area.

[0003] Patent document 2 describes an image output device that allows the internal data and content of a projection system to be viewed simultaneously, in which the content image and the internal data image are superimposed so that the internal data image is displayed in a non-display area.

[0004] Patent document 3 describes that in an image projection device such as a projector that has the function of performing color correction of a projected image using reflected light from a projection surface, the projected image is projected inward, with the surrounding area being a non-display area (black projection area).

[0005] Patent document 4 describes a projection-type video display device capable of simultaneously displaying multiple images on the same screen, in which a notification video that notifies information about the input source of the video displayed in the main window and a notification video that notifies information about the input source of the video displayed in the sub-window are displayed in a blank area where no images are displayed. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-163285 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-081560 [Patent Document 3] Japanese Patent Application Laid-Open No. 2011-135445 [Patent Document 4] Japanese Patent Application Laid-Open No. 2011-090038 Summary of the Invention

[0007] One embodiment of the technique of the present disclosure provides a projection device, a projection method, a control device, and a control program that can facilitate an instruction operation for geometric processing of a projected image. [Means for solving the problem]

[0008] A projection device according to one aspect of the present invention comprises a projection unit that projects a projection image generated by a display element based on an input image, and a processor, wherein the processor controls the projection of a support image showing at least a portion of the displayable area from the projection unit when performing geometric processing of the projection image in a non-display area of the displayable area of the display element other than the display area of the projection image.

[0009] A projection method according to one aspect of the present invention is a control method for a projection device having a projection unit that projects a projection image generated by a display element based on an input image, wherein a processor that controls the projection device controls the projection unit to project an assistance image showing at least a portion of the displayable area of the display element when geometric processing of the projection image is performed in a non-display area other than the display area of the projection image.

[0010] A control device of one aspect of the present invention is a control device for a projection device having a projection unit that projects a projection image generated by a display element based on an input image, and is equipped with a processor, wherein the processor controls the projection of an support image showing at least a portion of the displayable area from the projection unit when geometric processing of the projection image is performed in a non-display area of the displayable area of the display element other than the display area of the projection image.

[0011] A control program of one aspect of the present invention is a control program for a projection device having a projection unit that projects a projection image generated by a display element based on an input image, and causes a processor controlling the projection device to execute a process in which, when geometric processing of the projection image is performed in a non-display area of the display area of the display element other than the display area of the projection image, the processor controls the projection unit to project an support image showing at least a portion of the displayable area. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a projection device, a projection method, a control device, and a control program that can facilitate instruction operations for geometric processing. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing a schematic configuration of a projection device 10 to which a control device according to an embodiment is applied. [Figure 2] 2 is a schematic diagram showing an example of the internal configuration of the projection unit 1 shown in FIG. [Figure 3] 1 is a schematic diagram showing the external configuration of a projection device 10. FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view of an optical unit 106 of the projection device 10 shown in FIG. [Figure 5] 1 is a diagram showing an example of projection by a projection device 10. FIG. [Figure 6] 1 is a diagram showing an example of projection of a support image by a projection device 10. FIG. [Figure 7] FIG. 10 is a diagram showing an example of enlarging a projection image 5a. [Figure 8] FIG. 10 is a diagram showing an example of rotation of a projected image 5a. [Figure 9] FIG. 10 is a diagram showing an example of deformation of a projected image 5a. [Figure 10] FIG. 10 is a diagram showing an example of shifting of a projection image 5a. [Figure 11] 1A and 1B are diagrams illustrating an example of projection of an image for operation by the projection device 10. FIG. [Figure 12]10 is a diagram showing an example of rotation of an operation image 8 accompanying rotation of a projection image 5a. FIG. [Figure 13] 10 is a diagram showing an example of output of warning information based on the amount of deformation of a projection image 5a due to geometric processing. FIG. [Figure 14] 10 is a diagram showing another example of output of warning information based on the amount of deformation of the projection image 5a due to geometric processing. FIG. [Figure 15] 10 is a diagram showing an example of sharing of information on geometric processing between the projection device 10 and another projection device. FIG. [Figure 16] 10 is a flowchart showing an example of projection of a support image 7 according to the area of a non-display area 52. [Figure 17] 10 is a flowchart showing another example of projection of support image 7 according to the area of non-display area 52. [Figure 18] FIG. 10 is a diagram showing a first modified example of the support image 7. [Figure 19] FIG. 10 is a diagram showing a second modified example of the support image 7. [Figure 20] FIG. 10 is a diagram showing a third modified example of the support image 7. [Figure 21] 10 is a schematic diagram showing another external configuration of the projection device 10. FIG. [Figure 22] 22 is a cross-sectional view of an optical unit 106 of the projection device 10 shown in FIG. 21. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

[0015] (Embodiment) <Schematic configuration of the projection device 10 according to the embodiment> FIG. 1 is a schematic diagram showing a schematic configuration of a projection device 10 according to an embodiment.

[0016] The projection device 10 includes a projection unit 1, a control device 4, and an operation reception unit 2. The projection unit 1 is configured by, for example, a liquid crystal projector or a projector using LCOS (Liquid Crystal On Silicon). In the following description, the projection unit 1 is assumed to be a liquid crystal projector.

[0017] The control device 4 controls the projection by the projection device 10. The control device 4 is an example of a control device of the present invention. The control device 4 is a device including a control unit configured with various processors, a communication interface (not shown) for communicating with each unit, and a storage medium 4a such as a hard disk, a solid state drive (SSD), or a read only memory (ROM), and controls the projection unit 1. The various processors in the control unit of the control device 4 include a central processing unit (CPU), which is a general-purpose processor that executes programs to perform various processes, a programmable logic device (PLD), which is a processor whose circuit configuration can be changed after manufacture such as a field programmable gate array (FPGA), or a dedicated electrical circuit, which is a processor having a circuit configuration designed specifically to perform specific processes, such as an application specific integrated circuit (ASIC).

[0018] More specifically, the structure of these various processors is an electric circuit that combines circuit elements such as semiconductor devices. The control unit of the control device 4 may be configured with one of the various processors, or may be configured with a combination of two or more processors of the same or different types (for example, a combination of multiple FPGAs or a combination of a CPU and an FPGA).

[0019] The operation reception unit 2 detects instructions from the user (user instructions) by receiving various operations from the user. In this embodiment, the operation reception unit 2 is an operation unit such as a button, a key, a joystick, or the like provided on the main body of the projection device 10.

[0020] The projection object 6 is an object such as a screen having a projection surface on which a projected image is displayed by the projection unit 1. In the example shown in Fig. 1, the projection surface of the projection object 6 is a rectangular plane. The top, bottom, left, and right of the projection object 6 in Fig. 1 are assumed to be the top, bottom, left, and right of the actual projection object 6.

[0021] A projectable range 11, shown by a dashed line, is a range of the projection object 6 onto which projection by the projection unit 1 can be performed. In other words, the projection unit 1 can project onto a part or all of the projectable range 11. In the example shown in FIG. 1, the projectable range 11 is rectangular.

[0022] The projection unit 1, the control device 4, and the operation reception unit 2 may be realized by, for example, a single device (see, for example, FIGS. 3 and 4). Alternatively, the projection unit 1, the control device 4, and the operation reception unit 2 may be separate devices that communicate with each other and cooperate with each other.

[0023] <Internal configuration of the projection unit 1 shown in Figure 1> FIG. 2 is a schematic diagram showing an example of the internal configuration of the projection unit 1 shown in FIG.

[0024] As shown in FIG. 2, the projection unit 1 includes a light source 21, a light modulation unit 22, a projection optical system 23, and a control circuit 24.

[0025] The light source 21 includes a light emitting element such as a laser or an LED (Light Emitting Diode), and emits, for example, white light.

[0026] The light modulation unit 22 is a light modulation element composed of three liquid crystal panels that modulates the color light emitted from the light source 21 and separated into three colors, red, blue, and green, by a color separation mechanism not shown, based on image information to emit each color image. These three liquid crystal panels may be equipped with red, blue, and green filters, respectively, and the white light emitted from the light source 21 may be modulated by each liquid crystal panel to emit each color image. The light modulation unit 22 is an example of a display element of the present invention.

[0027] The projection optical system 23 receives light from the light source 21 and the light modulation unit 22, and is configured by, for example, a relay optical system including at least one lens. The light that passes through the projection optical system 23 is projected onto the projection object 6.

[0028] The area of the projection object 6 that is irradiated with light that passes through the entire range of the light modulation unit 22 becomes the projectable range 11 where projection by the projection unit 1 is possible. The area of the projectable range 11 that is irradiated with light that actually passes through from the light modulation unit 22 becomes the projection range. For example, by controlling the size, position, and shape of the area of the light modulation unit 22 through which light passes, the size, position, and shape of the projection range in the projectable range 11 change.

[0029] The control circuit 24 controls the light source 21, the light modulation unit 22, and the projection optical system 23 based on the display data input from the control device 4, thereby projecting an image based on this display data onto the projection object 6. The display data input to the control circuit 24 is made up of three pieces of data: red display data, blue display data, and green display data.

[0030] Furthermore, the control circuit 24 changes the projection optical system 23 based on a command input from the control device 4, thereby enlarging or reducing the projection range (see FIG. 1) of the projection unit 1. Furthermore, the control device 4 may change the projection optical system 23 based on an operation from the user received by the operation receiving unit 2, thereby moving the projection range of the projection unit 1.

[0031] The projection device 10 also includes a shift mechanism that mechanically or optically moves the projection range while maintaining the image circle of the projection optical system 23. The image circle of the projection optical system 23 is the area through which projection light incident on the projection optical system 23 passes through the projection optical system 23 appropriately in terms of light intensity dropoff, color separation, peripheral curvature, etc.

[0032] The shift mechanism is realized by at least one of an optical system shift mechanism that performs an optical system shift and an electronic shift mechanism that performs an electronic shift.

[0033] The optical system shift mechanism is, for example, a mechanism that moves the projection optical system 23 in a direction perpendicular to the optical axis (see, for example, FIGS. 3 and 4), or a mechanism that moves the light modulation unit 22 in a direction perpendicular to the optical axis instead of moving the projection optical system 23. The optical system shift mechanism may also be a mechanism that moves the projection optical system 23 and the light modulation unit 22 in combination.

[0034] The electronic shift mechanism is a mechanism that shifts the pseudo projection range by changing the range through which light is transmitted in the light modulation section 22.

[0035] The projection device 10 may also include a projection direction change mechanism that moves the projection range together with the image circle of the projection optical system 23. The projection direction change mechanism is a mechanism that changes the projection direction of the projection unit 1 by changing the orientation of the projection unit 1 through mechanical rotation (see, for example, FIGS. 3 and 4).

[0036] <Mechanical configuration of the projection device 10> Fig. 3 is a schematic diagram showing the external configuration of the projection device 10. Fig. 4 is a schematic cross-sectional view of the optical unit 106 of the projection device 10 shown in Fig. 3. Fig. 4 shows a cross section taken along a plane along the optical path of light emitted from the main body 101 shown in Fig. 3.

[0037] 3, the projection device 10 includes a main body 101 and an optical unit 106 that protrudes from the main body 101. In the configuration shown in FIG. 3, the operation reception unit 2, the control device 4, and the light source 21, light modulation unit 22, and control circuit 24 in the projection unit 1 are provided in the main body 101. The projection optical system 23 in the projection unit 1 is provided in the optical unit 106.

[0038] The optical unit 106 includes a first member 102 supported by a main body 101 and a second member 103 supported by the first member 102.

[0039] The first member 102 and the second member 103 may be an integrated member. The optical unit 106 may be configured to be detachable from the main body 101 (in other words, configured to be replaceable).

[0040] The main body 101 has a housing 15 (see FIG. 4) in which an opening 15a (see FIG. 4) for passing light is formed at a portion connected to the optical unit .

[0041] As shown in FIG. 3, inside the housing 15 of the main body 101, there is provided a light source 21 and a light modulation unit 12 including a light modulation section 22 (see FIG. 2) that spatially modulates the light emitted from the light source 21 based on input image data to generate an image.

[0042] The light emitted from the light source 21 is incident on the light modulation section 22 of the light modulation unit 12, and is spatially modulated by the light modulation section 22 before being emitted.

[0043] As shown in Figure 4, the image formed by the light spatially modulated by the light modulation unit 12 passes through the opening 15a of the housing 15 and enters the optical unit 106, and is projected onto the projection object 6 as the projection target, making the image G1 visible to the observer.

[0044] As shown in Figure 4, the optical unit 106 includes a first member 102 having a hollow portion 2A connected to the inside of the main body 101, a second member 103 having a hollow portion 3A connected to the hollow portion 2A, a first optical system 121 and a reflecting member 122 arranged in the hollow portion 2A, a second optical system 31, a reflecting member 32, a third optical system 33, and a lens 34 arranged in the hollow portion 3A, a shift mechanism 105, and a projection direction change mechanism 104.

[0045] The first member 102 is a member having, for example, a rectangular cross-sectional outer shape, and the openings 2a and 2b are formed on planes perpendicular to each other. The first member 102 is supported by the main body 101 with the opening 2a positioned opposite the opening 15a of the main body 101. Light emitted from the optical modulation section 22 of the optical modulation unit 12 of the main body 101 passes through the openings 15a and 2a and enters the hollow section 2A of the first member 102.

[0046] The incident direction of light entering hollow portion 2A from main body portion 101 is referred to as direction X1, the opposite direction to direction X1 is referred to as direction X2, and directions X1 and X2 are collectively referred to as direction X. In addition, in Figure 4, the direction from the front of the page toward the back and the opposite direction are referred to as direction Z. Within direction Z, the direction from the front of the page toward the back is referred to as direction Z1, and the direction from the back of the page toward the front is referred to as direction Z2.

[0047] Furthermore, the direction perpendicular to direction X and direction Z is referred to as direction Y, and within direction Y, the upward direction in Fig. 4 is referred to as direction Y1, and the downward direction in Fig. 4 is referred to as direction Y2. In the example of Fig. 4, the projection device 10 is disposed so that direction Y2 is the vertical direction.

[0048] The projection optical system 23 shown in Fig. 2 is composed of a first optical system 121, a reflecting member 122, a second optical system 31, a reflecting member 32, a third optical system 33, and a lens 34. Fig. 4 shows the optical axis K of the projection optical system 23. The first optical system 121, the reflecting member 122, the second optical system 31, the reflecting member 32, the third optical system 33, and the lens 34 are arranged along the optical axis K in this order from the light modulation unit 22 side.

[0049] The first optical system 121 includes at least one lens, and guides light that has entered the first member 102 from the main body 101 and travels in the direction X1 to the reflecting member 122.

[0050] The reflecting member 122 reflects the light incident from the first optical system 121 in a direction Y1. The reflecting member 122 is formed of, for example, a mirror. The first member 102 has an opening 2b formed on the optical path of the light reflected by the reflecting member 122, and this reflected light passes through the opening 2b and travels to the hollow portion 3A of the second member 103.

[0051] The second member 103 is a member having a substantially T-shaped cross-sectional outline, and has an opening 3a formed in a position facing the opening 2b of the first member 102. Light from the main body 101 that passes through the opening 2b of the first member 102 passes through this opening 3a and enters the hollow portion 3A of the second member 103. The cross-sectional outlines of the first member 102 and the second member 103 are arbitrary and are not limited to those described above.

[0052] The second optical system 31 includes at least one lens, and guides the light incident from the first member 102 to the reflecting member 32.

[0053] The reflecting member 32 reflects the light incident from the second optical system 31 in the direction X2 and guides the light to the third optical system 33. The reflecting member 32 is formed of, for example, a mirror.

[0054] The third optical system 33 includes at least one lens, and guides the light reflected by the reflecting member 32 to a lens .

[0055] The lens 34 is disposed at the end of the second member 103 on the direction X2 side so as to cover the opening 3c formed at this end. The lens 34 projects the light incident from the third optical system 33 onto the projection object 6.

[0056] The projection direction change mechanism 104 is a rotation mechanism that rotatably connects the second member 103 to the first member 102. The projection direction change mechanism 104 allows the second member 103 to rotate freely around a rotation axis (specifically, optical axis K) that extends in direction Y. Note that the projection direction change mechanism 104 is not limited to the arrangement position shown in FIG. 4 as long as it can rotate the optical system. Furthermore, the number of rotation mechanisms is not limited to one, and multiple mechanisms may be provided.

[0057] The shift mechanism 105 is a mechanism for moving the optical axis K of the projection optical system (in other words, the optical unit 106) in a direction perpendicular to the optical axis K (direction Y in FIG. 4). Specifically, the shift mechanism 105 is configured to be able to change the position of the first member 102 in direction Y relative to the main body 101. The shift mechanism 105 may be one that moves the first member 102 manually, or one that moves the first member 102 electrically.

[0058] Fig. 4 shows a state in which the first member 102 has been moved to the maximum extent in the direction Y1 by the shift mechanism 105. When the first member 102 is moved in the direction Y2 by the shift mechanism 105 from the state shown in Fig. 4, the relative position between the center of the image formed by the light modulation unit 22 (in other words, the center of the display surface) and the optical axis K changes, and the image G1 projected onto the projection object 6 can be shifted (translated) in the direction Y2.

[0059] The shift mechanism 105 may be a mechanism that moves the light modulation unit 22 in the direction Y, instead of moving the optical unit 106 in the direction Y. Even in this case, the image G1 projected onto the projection object 6 can be moved in the direction Y2.

[0060] <Projection by Projection Device 10> Fig. 5 is a diagram showing an example of projection by the projection device 10. In the example of Fig. 5, an input image 5 is input to the projection device 10. A displayable area 50 is a displayable area of the light modulation unit 22 (display element), and an image displayed by the entire displayable area 50 is projected onto the entire projectable range 11 by the projection optical system 23.

[0061] 5, the projection device 10 displays a projection image 5a based on the input image 5 in a part of the displayable area 50, and as a result, the projection image 5a is projected onto a part of the projectable range 11. The display area 51 is the area of the displayable area 50 in which the projection image 5a is displayed. The non-display area 52 is the area of the displayable area 50 other than the display area 51, i.e., the area in which the projection image 5a is not displayed.

[0062] <Projection of Support Image by Projection Device 10> 6 is a diagram showing an example of projection of a support image by the projection device 10. The control device 4 receives, for example, an instruction from a user and performs geometric processing of the projection image 5a in the non-display area 52. The geometric processing is not a pixel-by-pixel processing such as blurring, but rather a geometric processing of the projection image 5a. The geometric processing is, for example, an electrical processing performed by processing the input image 5 input to the light modulation unit 22.

[0063] The geometric processing of the projected image 5a in the non-display area 52 is geometric processing of the projected image 5a using the non-display area 52. Specifically, the geometric processing of the projected image 5a in the non-display area 52 is geometric processing that changes the projected image 5a so that at least a portion of the projected image 5a is included in at least a portion of the non-display area 52 before the geometric processing. Specific examples of such geometric processing include at least one of enlarging, rotating, transforming, and moving (shifting) the projected image 5a. The transformation of the projected image 5a also includes distortion correction of the projected image 5a, such as keystone correction. In addition to these geometric processing, the control device 4 may also be capable of geometric processing such as shrinking.

[0064] Furthermore, when performing geometric processing of the projection image 5a in the non-display area 52, the control device 4 controls the projection unit 1 to project the support image 7 that shows at least a part of the displayable area 50. Specifically, the control device 4 controls the projection unit 1 to project the support image 7 in a state in which it is possible to receive instructions for geometric processing of the projection image 5a from the user via the operation receiving unit 2.

[0065] The support image 7 is an image that directly or indirectly shows the user the boundary between the displayable area 50 and the outside of the displayable area 50. In other words, the support image 7 is an image that shows the user the range in which geometric processing of the input image 5 is possible using the non-display area 52. In the example shown in FIG. 7, the support image 7 is an image of the outer frame of the displayable area 50. The outer frame of the displayable area 50 is a frame inscribed on the periphery of the displayable area 50.

[0066] <Enlargement of projected image 5a> Fig. 7 is a diagram showing an example of enlargement of the projection image 5a. For example, in an enlargement mode in which an instruction to enlarge (geometric processing) the projection image 5a can be received from the user by operating a key included in the operation receiving unit 2, the control device 4 performs control to project the support image 7 from the projection unit 1 as shown in Fig. 6. Then, when the control device 4 receives an instruction to enlarge the projection image 5a from the user, it enlarges (electronically enlarges) the projection image 5a as shown in Fig. 7.

[0067] In the example shown in Fig. 7, the projected image 5a is enlarged to the left, up to near the left edge of the displayable area 50. When performing such enlargement, by projecting the support image 7 as shown in Fig. 6, the user can clearly recognize the left edge of the displayable area 50 and easily perform such an enlargement instruction operation. Note that the enlargement of the projected image 5a is not limited to the leftward enlargement shown in Fig. 7, but various enlargements are possible, such as enlargement to the right, enlargement in the upward direction, enlargement in the downward direction, enlargement in a diagonal direction, and enlargement while maintaining the aspect ratio.

[0068] <Rotation of the projected image 5a> Fig. 8 is a diagram showing an example of rotation of the projection image 5a. For example, in a rotation mode in which the control device 4 can receive an instruction to rotate (geometric processing) the projection image 5a from the user by operating a key included in the operation receiving unit 2, the control device 4 performs control to project the support image 7 from the projection unit 1 as shown in Fig. 6. Then, when the control device 4 receives an instruction to rotate the projection image 5a from the user, the control device 4 rotates (electronically rotates) the projection image 5a as shown in Fig. 8.

[0069] In the example shown in Fig. 8, the projected image 5a is rotated clockwise around the center of the projected image 5a until the two corners of the projected image 5a reach the upper and lower ends of the displayable area 50. When performing such a rotation, by projecting the support image 7 as shown in Fig. 6, the user can clearly recognize the upper and lower ends of the displayable area 50 and can easily perform the operation to instruct such a rotation. Note that the rotation of the projected image 5a is not limited to the rotation shown in Fig. 8, but may be a counterclockwise rotation or a rotation around a point other than the center of the projected image 5a.

[0070] <Deformation of the projected image 5a> 9 is a diagram showing an example of deformation of the projection image 5a. For example, in a deformation mode in which the control device 4 can receive an instruction to deform (geometric processing) the projection image 5a from the user by operating a key included in the operation receiving unit 2, the control device 4 performs control to project the support image 7 from the projection unit 1 as shown in FIG. 6. Then, when the control device 4 receives an instruction to deform the projection image 5a from the user, the control device 4 performs deformation (for example, keystone correction) of the projection image 5a as shown in FIG.

[0071] In the example shown in Fig. 9, the projected image 5a is deformed until the upper right and lower right corners of the projected image 5a reach near the upper and lower ends of the displayable area 50, respectively. When performing such a deformation, by projecting the support image 7 as shown in Fig. 6, the user can clearly recognize the upper and lower ends of the displayable area 50 and can easily perform the operation to instruct such a deformation. Note that the deformation of the projected image 5a is not limited to the rotation shown in Fig. 9, and various other deformations are possible.

[0072] <Shift of projection image 5a> Fig. 10 is a diagram showing an example of shifting of the projection image 5a. For example, in a shift mode in which the control device 4 can receive an instruction to shift (geometric processing) the projection image 5a from the user by operating a key included in the operation receiving unit 2, the control device 4 performs control to project the support image 7 from the projection unit 1 as shown in Fig. 6. Then, when the control device 4 receives an instruction to shift the projection image 5a from the user, the control device 4 shifts (electronically shifts) the projection image 5a as shown in Fig. 10.

[0073] In the example shown in Fig. 10, the projected image 5a is shifted leftward to the left edge of the displayable area 50. When performing such a shift, by projecting the support image 7 as shown in Fig. 6, the user can clearly recognize the left edge of the displayable area 50 and can easily perform such a shift instruction operation. Note that the shift (movement) of the projected image 5a is not limited to the leftward shift shown in Fig. 10, but various enlargements such as a rightward shift, an upward shift, a downward shift, and a diagonal shift enlargement can also be performed.

[0074] In this way, when projection device 10 projects projection image 5a based on input image 5 onto display area 51, which is a part of displayable area 50, and performs geometric processing of input image 5 in non-display area 52, projection device 10 projects support image 7 indicating displayable area 50. This allows the user to clearly recognize the range in which geometric processing of input image 5 using non-display area 52 is possible when instructing projection device 10 to perform geometric processing of input image 5 using non-display area 52. This makes it easier to instruct geometric processing of input image 5, such as enlarging, rotating, transforming, or moving input image 5.

[0075] Furthermore, by making the support image 7 an image of the outer frame of the displayable area 50, the impact on the appearance of the projected image 5a can be suppressed, while allowing the user to clearly recognize the range in which geometric processing of the input image 5 using the non-display area 52 is possible.

[0076] 5, when it is not possible to receive an instruction for geometric processing of the projection image 5a from the user via the operation receiving unit 2, the control device 4 may perform control so as not to project the support image 7 from the projection unit 1. In this way, when it is not possible to receive an instruction for geometric processing of the projection image 5a from the user, the support image 7 is not projected, thereby suppressing the impact on the appearance of the projection image 5a.

[0077] <Projection of Operational Images by Projection Device 10> Fig. 11 is a diagram showing an example of the projection of an image for operation by the projection device 10. In Fig. 11, the image for operation 8 may be projected as an OSD (On-Screen Display) image by being superimposed on the projection image 5a.

[0078] The operation image 8 is an image for operating the projection device 10. For example, the operation image 8 is an image showing how to instruct the above-mentioned geometric processing such as enlarging, rotating, transforming, and moving the projection image 5a. In the example shown in FIG. 11, the operation image 8 guides the user to rotate the projection image 5a right by pressing the right cursor key and to rotate the projection image 5a left by pressing the left cursor key. For example, when the user presses the right cursor key included in the operation reception unit 2, the control device 4 performs geometric processing to rotate the projection image 5a right.

[0079] Alternatively, the operation image 8 may guide the user to an interactive operation that allows the user to operate the projection image 5a by performing an operation to point to the operation image 8 in the projection image. For example, when the user performs an operation to point to the right cursor key among the operation images 8 in the projection image, the control device 4 performs a geometric process to rotate the projection image 5a to the right.

[0080] As a method for the control device 4 to detect an operation of pointing to an operation image 8 in the projected image, for example, a method can be used in which the user gives an instruction using an indicator having a sensor that can detect the pointing position in the projected image, and the control device 4 acquires the information from this indicator.

[0081] Alternatively, as a method for the control device 4 to detect an operation to point to the operation image 8 in the projected image, a method may be used in which an imaging device is used to capture an image of the projection object 6, and the user's instruction is detected by image recognition based on the captured image obtained by capturing the image with the imaging device.

[0082] 11, the control device 4 controls the projection of the operation image 8 onto the non-display area 52. This makes it possible to project the operation image 8 while suppressing a decrease in the visibility of the projection image 5a. However, the present invention is not limited to this configuration, and the control device 4 may project the operation image 8 onto the display area 51.

[0083] <Rotation of operation image 8 in accordance with rotation of projection image 5a> Fig. 12 is a diagram showing an example of the rotation of the operation image 8 accompanying the rotation of the projection image 5a. As shown in Fig. 11, suppose that the user performs an instruction operation to rotate the projection image 5a to the right (for example, pressing the right cursor key) while the projection device 10 is projecting the projection image 5a and the operation image 8. In this case, the control device 4 performs a rotation process to rotate the projection image 5a to the right in accordance with the instruction operation from the user, and also performs a rotation process on the operation image 8 in the same direction and by the same amount as the rotation process on the projection image 5a.

[0084] As a result, for example, when the projection device 10 is tilted to the left, if the user performs an instruction operation to rotate the projection image 5a to the right so that the projection image 5a projected onto the projection object 6 is horizontal, the operation image 8 projected onto the projection object 6 can also be made horizontal together with the projection image 5a. Therefore, the visibility of the operation image 8 can be improved without performing a separate instruction operation to rotate the operation image 8 to the right.

[0085] <Output of warning information based on the amount of deformation of the projection image 5a due to geometric processing> 13 is a diagram showing an example of output of warning information based on the amount of deformation of the projection image 5a due to geometric processing. When performing geometric processing that involves deformation of the projection image 5a, the control device 4 may output warning information based on the amount of deformation of the projection image 5a. In the example of FIG. 13, the output of the warning information is a change in the color of the support image 7.

[0086] For example, when the amount of deformation of the projected image 5a exceeds a predetermined value, the control device 4 changes the color of the support image 7 to a color different from the color of the support image 7 shown in Fig. 6. This allows the user to recognize that the amount of deformation of the projected image 5a has exceeded the predetermined value. Furthermore, by outputting warning information by changing the support image 7 that indicates the displayable area 50, which is the range within which deformation is possible, the user can intuitively recognize that the amount of deformation of the projected image 5a has exceeded the predetermined value.

[0087] The predetermined value to be compared with the deformation amount of the projection image 5a may be a fixed value set in advance, or may be a value calculated based on the relationship between the current range of the projection image 5a and the displayable area 50.

[0088] FIG. 14 is a diagram showing another example of output of warning information based on the amount of deformation of the projection image 5a due to geometric processing. Output of warning information based on the amount of deformation of the projection image 5a may be performed by projecting a frame 5b superimposed on the projection image 5a, as shown in FIG. 14. For example, when the amount of deformation of the projection image 5a exceeds a predetermined value, the control device 4 performs control to project a frame 5b surrounding the projection image 5a superimposed on the projection image 5a. This emphasizes the projection image 5a with the frame 5b, allowing the user to recognize that the amount of deformation of the projection image 5a has exceeded the predetermined value. Furthermore, the control device 4 may output warning information by both changing the support image 7 shown in FIG. 13 and changing (emphasizing) the projection image 5a shown in FIG. 14.

[0089] In this way, the output of the warning information is not limited to a change in the support image 7, but may be any process that allows the user to recognize that the amount of deformation of the projection image 5a has exceeded a predetermined value. The output of the warning information may also be a display or voice output of a message such as "The amount of deformation of the projection image is too great."

[0090] <Sharing of Geometric Processing Information Between Projection Device 10 and Other Projection Devices> Fig. 15 is a diagram showing an example of sharing of geometric processing information between the projection device 10 and another projection device. The projection device 10B shown in Fig. 15 is a projection device having a similar configuration to the projection device 10. The projectable range 11B is the projectable range of the projection device 10B. In the example of Fig. 15, the projectable ranges 11 and 11B exist on one projection object 6, but the projectable ranges 11 and 11B may exist on different projection objects.

[0091] 15, the same input image is input to the projection devices 10 and 10B, and the same projection image 5a is projected in the projectable ranges 11 and 11B, but different input images may be input to the projection devices 10 and 10B, and different projection images may be projected in the projectable ranges 11 and 11B. The different input images input to the projection devices 10 and 10B may be images obtained by dividing a horizontally long image into left and right halves.

[0092] In addition, in the example of Figure 15, the projectable ranges 11 and 11B are arranged with a gap between them, but the projectable ranges 11 and 11B may be arranged adjacent to each other or may be arranged with overlapping portions.

[0093] The projection devices 10 and 10B each include a communication unit and can communicate with each other. The communication between the projection devices 10 and 10B may be wired or wireless. By communicating with each other, the projection devices 10 and 10B share information about their geometric processing.

[0094] For example, when projection device 10B enlarges (geometrically processes) the projection image 5a of projection device 10B, it transmits information indicating the direction and amount of the enlargement to projection device 10. Based on the information received from projection device 10B, projection device 10 enlarges the projection image 5a of projection device 10 by the same amount and in the same direction as the enlargement performed by projection device 10B. This makes it possible to apply the geometric processing to the projection image 5a of projection device 10 simply by performing an instruction operation for the geometric processing on the projection image 5a of projection device 10B.

[0095] <Projection of Support Image 7 According to the Area of Non-Display Area 52> Fig. 16 is a flowchart showing an example of projection of the support image 7 according to the area of the non-display region 52. For example, the control device 4 executes the process shown in Fig. 16 in a state where the projection image 5a is projected as shown in Fig. 5. First, the control device 4 determines whether or not it is in a state where it can accept a command operation for geometric processing from the user (step S161), and waits until it is in a state where it can accept a command operation for geometric processing from the user (step S161: No loop).

[0096] In step S161, when a state in which a geometric processing instruction operation can be received from the user is reached (step S161: Yes), control device 4 determines whether the area of non-display area 52 is equal to or greater than a predetermined value (step S162). The area of non-display area 52 can be calculated, for example, by subtracting the number of pixels of projected image 5a (display area 51) from the number of pixels of displayable area 50.

[0097] In step S162, if the area of non-display area 52 is not equal to or greater than the predetermined value (step S162: No), the control device 4 proceeds to step S164. At this time, if the support image 7 has been projected, the control device 4 performs control to not project the support image 7. If the area of non-display area 52 is equal to or greater than the predetermined value (step S162: Yes), the control device 4 projects the support image 7 as shown in FIG. 6 (step S163).

[0098] Next, the control device 4 determines whether or not a command operation for geometric processing has been received from the user (step S164). If a command operation has not been received (step S164: No), the control device 4 returns to step S161. If a command operation has been received (step S164: Yes), the control device 4 executes geometric processing of the projection image 5a in accordance with the received command operation (step S164), and returns to step S161.

[0099] In the process shown in FIG. 16, the process consisting of steps S162 and S163 and the process consisting of steps S164 and S165 may be executed in reverse order or in parallel.

[0100] In this way, projection device 10 may control the projection of support image 7 depending on the area of non-display area 52. In the example of Fig. 16, support image 7 can be projected when non-display area 52 is large, and support image 7 cannot be projected when non-display area 52 is small. As a result, when non-display area 52 is large and the edge of projected image 5a is far from the edge of displayable area 50, support image 7 is projected, making it possible to recognize displayable area 50 in which geometric processing of projected image 5a is possible.

[0101] Furthermore, once a certain amount of geometric processing has been performed and non-display area 52 has become smaller, support image 7 is no longer projected, preventing support image 7 from interfering with geometric processing instruction operations or the visibility of projected image 5a. Furthermore, at this stage, because the range of projected image 5a (display area 51) is close to displayable area 50, the user can, to some extent, recognize displayable area 50 in which geometric processing of projected image 5a is possible, even without projecting support image 7.

[0102] Fig. 17 is a flowchart showing another example of the projection of the support image 7 according to the area of the non-display area 52. For example, the control device 4 may execute the process shown in Fig. 17 in a state in which the projection image 5a is projected as shown in Fig. 5. Steps S171 to S175 shown in Fig. 17 are the same as steps S161 to S165 shown in Fig. 16. However, in step S172, the control device 4 determines whether the area of the non-display area 52 is equal to or smaller than a predetermined value (step S172).

[0103] In step S172, if the area of non-display area 52 is not equal to or less than the predetermined value (step S172: No), the control device 4 proceeds to step S174. If the area of non-display area 52 is equal to or less than the predetermined value (step S172: Yes), the control device 4 proceeds to step S173.

[0104] In the process shown in FIG. 17, the process consisting of steps S172 and S173 and the process consisting of steps S174 and S175 may be executed in reverse order or in parallel.

[0105] In this way, projection device 10 may project support image 7 when non-display area 52 is small and there is little room for geometric processing, and may not project support image 7 when non-display area 52 is large and there is plenty of room for geometric processing. Projecting support image 7 when there is little room for geometric processing makes it easier for the user to perform geometric processing to the full extent of displayable area 50. Furthermore, not projecting support image 7 when there is plenty of room for geometric processing can reduce the impact on the appearance of projected image 5a. Projecting support image 7 when non-display area 52 has been subjected to a certain amount of geometric processing and has become smaller allows the user to intuitively recognize that support image 7 is an image that indicates the limits of geometric processing.

[0106] The control device 4 may also control the projection of the support image 7 according to the attributes of the input image 5. The attributes of the input image 5 may be, for example, at least one of the aspect ratio, the number of pixels, and the image size (height x width) of the input image 5. As an example, the control device 4 may control the projection of the support image 7 when the attributes of the input image 5 (e.g., the number of pixels) are outside a predetermined range, and may not project the support image 7 when the attributes of the input image 5 are within the range.

[0107] In this way, the control device 4 may perform control such that the support image 7 is projected when the area of the non-display area 52 or the attributes of the input image are outside a predetermined range, and the support image 7 is not projected when the area of the non-display area 52 or the attributes of the input image are within a predetermined range.

[0108] <Modification of Support Image 7> Fig. 18 is a diagram showing a first modified example of the support image 7. Fig. 19 is a diagram showing a second modified example of the support image 7. In Fig. 6 and other figures, the support image 7 showing the entire boundary (outer periphery) of the displayable area 50 has been described, but as shown in Figs. 18 and 19, the support image 7 may be a frame image showing part of the boundary of the displayable area 50.

[0109] 20 is a diagram showing a third variation of the support image 7. The support image 7 is not limited to a frame image that directly indicates part of the boundary of the displayable area 50, but may also be a frame image that indirectly indicates part of the boundary of the displayable area 50, such as an image of four arrows pointing to the four corners of the displayable area 50, as shown in FIG. 20. The support image 7 may also be an image of four arrows pointing to the four sides of the displayable area 50. Instead of the above-mentioned arrow images, other marking images such as circles may also be used.

[0110] <Modifications of the Projection Device 10> In Figures 3 and 4, the configuration of the projection device 10 has been described as being such that the optical axis K is bent twice using the reflecting member 122 and the reflecting member 32, but it is also possible to omit the reflecting member 122 and the reflecting member 32 and have a configuration in which the optical axis K is not bent, or to omit either the reflecting member 122 or the reflecting member 32 and have a configuration in which the optical axis K is bent once.

[0111] Fig. 21 is a schematic diagram showing another external configuration of the projection device 10. Fig. 22 is a schematic cross-sectional view of the optical unit 106 of the projection device 10 shown in Fig. 21. In Figs. 21 and 22, parts similar to those shown in Figs. 3 and 4 are designated by the same reference numerals and descriptions thereof will be omitted.

[0112] The optical unit 106 shown in Fig. 21 includes a first member 102 supported by a main body 101, and does not include the second member 103 shown in Fig. 3 and Fig. 4. Furthermore, the optical unit 106 shown in Fig. 21 does not include the reflecting member 122, the second optical system 31, the reflecting member 32, the third optical system 33, and the projection direction changing mechanism 104 shown in Fig. 3 and Fig. 4.

[0113] In the optical unit 106 shown in Fig. 21, the projection optical system 23 shown in Fig. 2 is composed of a first optical system 121 and a lens 34. Fig. 22 shows the optical axis K of this projection optical system 23. The first optical system 121 and the lens 34 are arranged along the optical axis K in this order from the light modulation unit 22 side.

[0114] The first optical system 121 guides light traveling in the direction X1 that is incident on the first member 102 from the main body 101 to the lens 34. The lens 34 is disposed at the end of the main body 101 on the direction X1 side so as to close the opening 3c formed at this end. The lens 34 projects the light that has been incident from the first optical system 121 onto the projection object 6.

[0115] <Modification of the control device> Although the control device of the embodiment has been described as being applied to the control device 4 of the projection device 10, the present invention is not limited to this configuration. For example, the control device of the embodiment may be another device that can communicate directly or indirectly with the projection device 10. For example, the control device of the embodiment may be an information terminal such as a personal computer or a smartphone that can communicate with the projection device 10. In this case, the control device of the embodiment communicates with the projection device 10 to perform the various controls described above.

[0116] <Other variations> The control device 4 may also control the projection of a bar-shaped image or the like that can be moved by a user operation and that indicates the extent of geometric processing, onto the non-display area 52, to be superimposed on the projection image 5a or the support image 7. The control device 4 may also control the projection of an image that can be superimposed on the projection image 5a or the support image 7 to superimpose the projectable range 11 onto another projectable area (for example, the projectable range 11B), onto the non-display area 52.

[0117] This specification describes at least the following:

[0118] (1) a projection unit that projects a projection image generated by a display element based on an input image; a processor, The processor is When performing geometric processing of the projection image in a non-display area other than the display area of the projection image within the displayable area of the display element, control is performed to project a support image showing at least a part of the displayable area from the projection unit. Projection device.

[0119] (2) The projection device according to (1), The processor receives an instruction from a user and performs the geometric processing. Projection device.

[0120] (3) (2) The projection device according to the present invention, the processor, in a state of accepting the instruction, performs the control of projecting the support image from the projection unit; Projection device.

[0121] (4) The projection device according to (2) or (3), the processor performs the control to stop the projection of the support image from the projection unit when the instruction is not accepted. Projection device.

[0122] (5) The projection device according to any one of (1) to (4), the support image is an image of at least a part of the outer perimeter frame of the displayable area; Projection device.

[0123] (6) The projection device according to any one of (1) to (4), the geometric processing is processing of changing the projected image so that at least a part of the projected image is included in at least a part of the non-display area; Projection device.

[0124] (7) The projection device according to any one of (1) to (6), The geometric processing includes at least one of enlarging, rotating, transforming, and moving the projected image. Projection device.

[0125] (8) The projection device according to any one of (1) to (7), the processor superimposes an operation image for operating the projection device on the projection image and projects it from the projection unit, and when performing a rotation process on the projection image as the geometric processing, controls the processor to perform a rotation process on the operation image in the same direction and amount as the rotation process. Projection device.

[0126] (9) The projection device according to any one of (1) to (8), the processor performs control to output warning information based on the amount of deformation of the projection image due to the geometric processing. Projection device.

[0127] (10) The projection device according to any one of (1) to (9), Further, a communication unit for communicating with other projection devices is provided, the processor communicates with the other projection devices via the communication unit to share information about the geometric processing; Projection device.

[0128] (11) The projection device according to any one of (1) to (10), the processor performs the control to project the support image in accordance with an area of the non-display area. Projection device.

[0129] (12) The projection device according to any one of (1) to (10), the processor performs the control to project the support image in accordance with attributes of the input image; Projection device.

[0130] (13) The projection device according to (12), The attribute is an aspect ratio, a number of pixels, or an image size of the input image. Projection device.

[0131] (14) The projection device according to any one of (11) to (13), the processor performs the control to project the support image when the area or the attribute is outside a predetermined range. Projection device.

[0132] (15) A control method for a projection device including a projection unit that projects a projection image generated by a display element based on an input image, the method comprising: The processor controlling the projection device includes: When performing geometric processing of the projection image in a non-display area other than the display area of the projection image within the displayable area of the display element, control is performed to project a support image showing at least a part of the displayable area from the projection unit. Projection method.

[0133] (16) (15) A projection method according to (15), The processor receives an instruction from a user and performs the geometric processing. Projection method.

[0134] (17) The projection method according to (16), the processor, in a state of accepting the instruction, performs the control of projecting the support image from the projection unit; Projection method.

[0135] (18) The projection method according to (16) or (17), the processor performs the control to stop the projection of the support image from the projection unit when the instruction is not accepted. Projection method.

[0136] (19) The projection method according to any one of (15) to (18), the support image is an image of at least a part of the outer perimeter frame of the displayable area; Projection method.

[0137] (20) The projection method according to any one of (15) to (18), the geometric processing is processing of changing the projected image so that at least a part of the projected image is included in at least a part of the non-display area; Projection method.

[0138] (twenty one) The projection method according to any one of (15) to (20), The geometric processing includes at least one of enlarging, rotating, transforming, and moving the projected image. Projection method.

[0139] (twenty two) The projection method according to any one of (15) to (21), the processor superimposes an operation image for operating the projection device on the projection image and projects it from the projection unit, and when performing a rotation process on the projection image as the geometric processing, controls the processor to perform a rotation process on the operation image in the same direction and amount as the rotation process. Projection method.

[0140] (twenty three) The projection method according to any one of (15) to (22), the processor performs control to output warning information based on the amount of deformation of the projection image due to the geometric processing. Projection method.

[0141] (twenty four) The projection method according to any one of (15) to (23), Further, a communication unit for communicating with other projection methods is included, the processor communicates with the other projection methods via the communication unit to share information about the geometric processing; Projection method.

[0142] (twenty five) The projection method according to any one of (15) to (24), the processor performs the control to project the support image in accordance with an area of the non-display area. Projection method.

[0143] (26) The projection method according to any one of (15) to (24), the processor performs the control to project the support image in accordance with attributes of the input image; Projection method.

[0144] (27) (26) A projection method according to (26), The attribute is an aspect ratio, a number of pixels, or an image size of the input image. Projection method.

[0145] (28) The projection method according to any one of (25) to (27), the processor performs the control to project the support image when the area or the attribute is outside a predetermined range. Projection method.

[0146] (29) A control device for a projection device including a projection unit that projects a projection image generated by a display element based on an input image, a processor; When performing geometric processing of the projection image in a non-display area other than the display area of the projection image within the displayable area of the display element, the processor controls the projection unit to project a support image showing at least a part of the displayable area. Control device.

[0147] (30) A control program for a projection device including a projection unit that projects a projection image generated by a display element based on an input image, A processor that controls the projection device When performing geometric processing of the projection image in a non-display area other than the display area of the projection image within the displayable area of the display element, the processor controls the projection unit to project a support image showing at least a part of the displayable area. A control program for executing processing. [Explanation of symbols]

[0148] 1 Projection section 2 Operation reception section 2A,3A Hollow part 2a,2b,3a,3c,15a opening 4. Control device 4a Storage medium 5. Input image 5a Projected image 5b frame 6 Projection object 7 Supporting Images 8 Operational Images 10,10B Projection device 11,11B Projection range 12 Optical modulation unit 15 Case 21 Light source 22 Optical modulation section 23 Projection optical system 24 Control circuit 31 Second optical system 32,122 Reflective material 33 Third optical system 34 Lens 50 Displayable area 51 Display area 52 Hidden area 101 Main body 102 First member 103 Second member 104 Projection direction change mechanism 105 Shift mechanism 106 Optical Unit 121 1st optical system G1 Image

Claims

1. a projection unit that projects a projection image generated by a display element based on an input image; a processor, The processor: an operation image that can be used to operate the projection device in response to an instruction operation from a user is superimposed on the projection image and projected from the projection unit; When performing geometric processing of the projection image in a non-display area other than the display area of the projection image within the displayable area of the display element, control is performed to project a support image showing at least a part of the displayable area from the projection unit; When performing rotation processing of the projection image as the geometric processing, control is performed to perform rotation processing of the operation image in the same rotation direction and amount as the rotation processing of the projection image; and performing control to output warning information based on the amount of deformation of the projection image due to the geometric processing by changing the support image. Projection device.

2. 2. The projection device according to claim 1, the processor accepts an instruction from a user and performs the geometric processing; Projection device.

3. 3. The projection device according to claim 2, the processor performs the control to project the support image from the projection unit while accepting the instruction. Projection device.

4. 4. The projection device according to claim 2 or 3, the processor performs the control to stop projecting the support image from the projection unit when the instruction is not accepted. Projection device.

5. 5. The projection device according to claim 1, the support image is an image of at least a part of the outer perimeter frame of the displayable area; Projection device.

6. 5. The projection device according to claim 1, the geometric processing is processing for changing the projected image so that at least a portion of the projected image is included in at least a portion of the non-display area; Projection device.

7. 7. A projection device according to claim 1, The geometric processing includes at least one of enlarging, rotating, transforming, and moving the projected image. Projection device.

8. A projection device according to any one of claims 1 to 7, Further, a communication unit for communicating with other projection devices is provided, the processor communicates with the other projection device via the communication unit to share information about the geometric processing; Projection device.

9. A projection device according to claim 1, comprising: the processor performs the control to project the support image in accordance with an area of the non-display area. Projection device.

10. The projection device according to claim 9, the processor performs the control to project the support image when the area is outside a predetermined range. Projection device.

11. A projection device according to any one of claims 1 to 8, the processor performs the control to project the support image according to attributes of the input image; Projection device.

12. The projection device according to claim 11, The attribute is an aspect ratio, a number of pixels, or an image size of the input image. Projection device.

13. The projection device according to claim 11 or 12, the processor performs the control to project the support image when the attribute is outside a predetermined range. Projection device.

14. A projection method for a projection device having a projection unit that projects a projection image generated by a display element based on an input image, comprising: a processor for controlling the projection device, an operation image that can be used to operate the projection device in response to an instruction operation from a user is superimposed on the projection image and projected from the projection unit; When performing geometric processing of the projection image in a non-display area other than the display area of the projection image within the displayable area of the display element, control is performed to project a support image showing at least a part of the displayable area from the projection unit; When performing rotation processing of the projection image as the geometric processing, control is performed to perform rotation processing of the operation image in the same rotation direction and amount as the rotation processing of the projection image; and performing control to output warning information based on the amount of deformation of the projection image due to the geometric processing by changing the support image. Projection method.

15. The projection method according to claim 14, the processor accepts an instruction from a user and performs the geometric processing; Projection method.

16. The projection method according to claim 15, the processor performs the control to project the support image from the projection unit while accepting the instruction. Projection method.

17. The projection method according to claim 15 or 16, the processor performs the control to stop projecting the support image from the projection unit when the instruction is not accepted. Projection method.

18. A projection method according to any one of claims 14 to 17, comprising: the support image is an image of at least a part of the outer perimeter frame of the displayable area; Projection method.

19. A projection method according to any one of claims 14 to 17, comprising: the geometric processing is processing for changing the projected image so that at least a portion of the projected image is included in at least a portion of the non-display area; Projection method.

20. A projection method according to any one of claims 14 to 19, comprising: The geometric processing includes at least one of enlarging, rotating, transforming, and moving the projected image. Projection method.

21. A projection method according to any one of claims 14 to 20, comprising: Further, a communication unit for communicating with other projection devices is included, the processor communicates with the other projection device via the communication unit to share information about the geometric processing; Projection method.

22. A projection method according to any one of claims 14 to 21, comprising: the processor performs the control to project the support image in accordance with an area of the non-display area. Projection method.

23. The projection method of claim 22, the processor performs the control to project the support image when the area is outside a predetermined range. Projection method.

24. A projection method according to any one of claims 14 to 21, comprising: the processor performs the control to project the support image according to attributes of the input image; Projection method.

25. The projection method according to claim 24, The attribute is an aspect ratio, a number of pixels, or an image size of the input image. Projection method.

26. The projection method according to claim 24 or 25, the processor performs the control to project the support image when the attribute is outside a predetermined range. Projection method.

27. A control device for a projection device including a projection unit that projects a projection image generated by a display element based on an input image, comprising: a processor; The processor: an operation image that can be used to operate the projection device in response to an instruction operation from a user is superimposed on the projection image and projected from the projection unit; When performing geometric processing of the projection image in a non-display area other than the display area of the projection image within the displayable area of the display element, control is performed to project a support image showing at least a part of the displayable area from the projection unit; When performing rotation processing of the projection image as the geometric processing, control is performed to perform rotation processing of the operation image in the same rotation direction and amount as the rotation processing of the projection image; and performing control to output warning information based on the amount of deformation of the projection image due to the geometric processing by changing the support image. Control device.

28. A control program for a projection device having a projection unit that projects a projection image generated by a display element based on an input image, comprising: a processor for controlling the projection device, an operation image that can be used to operate the projection device in response to an instruction operation from a user is superimposed on the projection image and projected from the projection unit; When performing geometric processing of the projection image in a non-display area other than the display area of the projection image within the displayable area of the display element, control is performed to project a support image showing at least a part of the displayable area from the projection unit; When performing rotation processing of the projection image as the geometric processing, control is performed to perform rotation processing of the operation image in the same rotation direction and amount as the rotation processing of the projection image; and performing control to output warning information based on the amount of deformation of the projection image due to the geometric processing by changing the support image. A control program for executing processing.

Images