Projector and method for controlling the projector

Abstract

To grasp change in the attitude of a projector.SOLUTION: A control method of a projector comprises the steps of: acquiring first imaging information indicating an imaging result of a first image projected from a projector at first timing; acquiring second imaging information indicating an imaging result of a second image projected from the projector at second timing; determining whether or not change in the attitude of the projector satisfies a fixed standard on the basis of the first imaging information and second imaging information; and outputting information based on the result of determination according to the result of determination.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a projector and a method for controlling the projector.

[0002] A projector is generally used while being installed on a ceiling, a wall, a desk, or the like. For example, Patent Document 1 discloses a technique for suspending and installing a projector using an existing ceiling suspension device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when a projector is installed on a ceiling, a wall, a desk, or the like, the posture of the projector may change.

Means for Solving the Problems

[0005] One aspect of the method for controlling a projector according to the present invention includes: acquiring first imaging information indicating an imaging result of a first image projected from the projector at a first timing; acquiring second imaging information indicating an imaging result of a second image projected from the projector at a second timing; determining whether a change in the posture of the projector satisfies a certain criterion based on the first imaging information and the second imaging information; and outputting information based on the determination result according to the determination result.

[0006] One aspect of the projector according to the present invention is a projector, which includes an acquisition unit that acquires first imaging information indicating an imaging result of a first image projected from the projector at a first timing and second imaging information indicating an imaging result of a second image projected from the projector at a second timing from an imaging device fixed to the projector, a determination unit that determines whether a change in the posture of the projector satisfies a certain standard based on the first imaging information and the second imaging information, and an output unit that outputs information based on the determination result according to the determination result generated by the determination unit.

[0007] One aspect of the projector according to the present invention is a projector, which includes an acquisition unit that acquires first imaging information indicating an imaging result of a first image projected from the projector at a first timing and second imaging information indicating an imaging result of a second image projected from the projector at a second timing from an imaging device fixed at a location other than the projector, a determination unit that determines whether a change in the posture of the projector satisfies a certain standard based on the first imaging information and the second imaging information, and an output unit that outputs information based on the determination result according to the determination result generated by the determination unit.

Brief Description of the Drawings

[0008]

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Embodiments for Carrying Out the Invention

[0009] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Note that the dimensions and scales of each part in the drawings may be different from the actual ones, and there are also parts shown schematically for easy understanding. Also, the scope of the present invention is not limited to these embodiments unless otherwise specifically stated in the following description.

[0010] 1. First Embodiment 1.1. Outline of the Projector FIG. 1 is a diagram for explaining the outline of a projector 1 according to the first embodiment. The projector 1 is fixed to the ceiling WL via an installation tool 9. The installation tool 9 includes a dedicated fixing tool, male and female screws for fixing the dedicated fixing tool to the ceiling WL, and male and female screws for fixing the projector 1 to the dedicated fixing tool. Note that the installation tool 9 may be a component that directly fixes the projector 1 to the ceiling without using a dedicated fixing tool or the like. Also, regarding the installation location of the projector 1, it may be installed on a wall, pillar or beam, or on a desk, shelf, floor or cart, etc.

[0011] The projector 1 can project a projection image G onto the screen SC. Also, the projector 1 can acquire a captured image C obtained by capturing the projection image G. The projection image G may change in terms of the coordinates of the vertices, area, shape or brightness, etc., according to the change in the posture of the projector 1.

[0012] FIG. 2 is a view showing a surface of the projector 1 according to the first embodiment that faces the screen SC. Hereinafter, the surface of the projector 1 that faces the screen SC may be referred to as the front of the projector 1. The front of the projector 1 includes a projection lens 400 of a projection unit 40 that projects a projection image G onto the screen SC, and an imaging lens 500 of an imaging device 50 that acquires an imaging image C. As shown in FIG. 2, it is preferable that the projection lens 400 and the imaging lens 500 are provided at different positions on the front of the projector 1. Although FIG. 2 shows a case where the imaging lens 500 is provided on the front of the projector 1, the imaging lens 500 may be provided other than on the front of the projector 1.

[0013] 1.2. Configuration of the Projector FIG. 3 is a block diagram showing a configuration example of the projector 1 according to the first embodiment. The projector 1 includes a control unit 10 that controls the projector 1, a storage unit 20 that stores various types of information, a communication unit 30 that executes communication with an external terminal or the like, a projection unit 40 that projects a projection image G, and an imaging device 50 that acquires an imaging image C.

[0014] The storage unit 20 is configured to include, for example, a RAM and a ROM. Here, RAM is an abbreviation for Random Access Memory, and ROM is an abbreviation for Read Only Memory. The storage unit 20 stores a control program PG, determination reference information JH, and output information JO. The storage unit 20 also stores imaging information JS, which is information indicating the imaging image C acquired by the imaging device 50. Note that part or all of the storage unit 20 may be provided in an external storage device or an external server or the like.

[0015] The control unit 10 is configured to include one or more CPUs. However, the control unit 10 may be provided with a programmable logic device such as an FPGA instead of or in addition to the CPU. Here, CPU is an abbreviation for Central Processing Unit, and FPGA is an abbreviation for Field-Programmable Gate Array. The control unit 10 functions as the acquisition unit 11, the processing unit 12, the determination unit 14, and the output unit 15 by the CPU or the like included in the control unit 10 executing the control program PG and operating according to the control program PG.

[0016] The acquisition unit 11 acquires information received by the communication unit 30, for example, imaging information JS indicating an imaging image C acquired by the imaging device 50 and an image signal that is the source of the projection image G, and stores it in the storage unit 20.

[0017] The processing unit 12 generates projection image information indicating the projection image G by performing signal processing on the image signal acquired by the acquisition unit 11.

[0018] The determination unit 14 determines whether a change in the posture of the projector 1 satisfies a certain criterion based on the imaging information JS acquired by the acquisition unit 11 and the determination criterion information JH stored in the storage unit 20. Also, the determination unit 14 generates determination result information based on the result of the determination. The determination criterion information JH includes information regarding the selection method of the imaging information JS used for the determination, information regarding the determination method, and information regarding a threshold value for determining whether a change in the posture of the projector 1 satisfies a certain criterion.

[0019] The output unit 15 outputs output information JO, which is information based on the determination result information, according to the result of the determination in the determination unit 14. The output information JO may be image information, character information, or audio information. Also, the output information JO may be projected from the projection unit 40 to the screen SC, transmitted from the communication unit 30 to an external terminal such as a smartphone or a personal computer, and displayed on a display provided in the external terminal, or may be reported from an acoustic device such as a speaker.

[0020] The communication unit 30 includes, for example, an interface board having a connector and an interface circuit, and has a function of receiving various information from an external terminal, the imaging device 50, an external storage device, an external server, etc., and a function of transmitting various information to an external terminal, an audio device, an external storage device, an external server, etc. The communication unit 30 may transmit and receive information via input / output terminals such as USB terminals, HDMI terminals, or LAN terminals, or may transmit and receive information by wireless communication using Bluetooth or the like. Here, USB is an abbreviation for Universal Serial Bus, HDMI is an abbreviation for High-Definition Multimedia Interface, and LAN is an abbreviation for Local Area Network. USB, HDMI, and Bluetooth are registered trademarks, respectively.

[0021] The projection unit 40 includes a light source device including a halogen lamp, a xenon lamp, an ultra-high pressure mercury lamp, an LED, or a laser light source, etc., a light modulator that generates image light, and a projection optical system that projects the image light onto the screen SC. The light modulator that generates image light includes a DMD or a liquid crystal panel, etc., and the projection optical system includes a projection lens 400. Here, LED is an abbreviation for Light Emitting Diode, and DMD is an abbreviation for Digital Mirror Device. The projection unit 40 projects a projection image G onto the screen SC based on the projection image information generated by the processing unit 12.

[0022] The imaging device 50 captures the projected image G projected onto the screen SC. Thereby, the imaging device 50 acquires the captured image C. The imaging device 50 includes an imaging lens 500 and an image sensor (not shown). The image sensor is, for example, an image sensor such as a CCD or a CMOS. Here, CCD is an abbreviation for Charge Coupled Device, and CMOS is an abbreviation for Complementary Metal Oxide Semiconductor. Note that the imaging device 50 may be provided outside the projector 1, and specifically, may be fixed to the outside of the housing of the projector 1. The imaging device 50 is, for example, a camera.

[0023] 1.3. Changes in the posture of the projector and changes in the projected image recorded in the captured image FIGS. 4 and 5 are diagrams showing the projected image G projected from the projector 1 onto the screen SC and the state of capturing of the projected image G by the imaging device 50. FIGS. 6 and 7 are diagrams showing the projected image G recorded in the captured image C.

[0024] FIG. 4 is a diagram in which the front of the projector 1 and the screen SC are arranged to face each other, and the optical axis AX of the projection lens 400 and the optical axis AY of the imaging lens 500 are perpendicular to the screen SC. That is, the optical axis AX and the optical axis AY are in a parallel relationship. Further, FIG. 4 shows that when the front of the projector 1 is viewed from a direction perpendicular to the front of the projector 1, the imaging lens 500 is provided at a position different in the vertical direction from the projection lens 400. In FIG. 4, the projected image G projected from the projection unit 40 to the screen SC is referred to as a projected image G1. As shown in FIG. 4, let the distance from the intersection of the projection lens 400 and the optical axis AX to the upper side of the projected image G1 be L1. Also, let the distance from the intersection of the projection lens 400 and the optical axis AX to the lower side of the projected image G1 be L2. Further, let the distance from the intersection of the imaging lens 500 and the optical axis AY to the upper side of the projected image G1 be L3. Also, let the distance from the intersection of the imaging lens 500 and the optical axis AY to the lower side of the projected image G1 be L4.

[0025] FIG. 5 is a diagram showing that the posture of the projector 1 changes from the state of FIG. 4, and the intersection of the optical axis AX and the screen SC moves in the direction opposite to the vertical direction with respect to the intersection of the optical axis AX and the projection lens 400. In FIG. 5, the relative positional relationship between the imaging lens 500 and the projection lens 400 does not change from FIG. 4, the optical axis AY and the optical axis AX maintain a parallel relationship, and the distance between the optical axis AY and the optical axis AX is constant. Also, in FIG. 5, the projection image G projected from the projection unit 40 onto the screen SC is referred to as a projection image G2. As shown in FIG. 5, let the distance from the intersection of the projection lens 400 and the optical axis AX to the upper side of the projection image G2 be L5. Also, let the distance from the intersection of the projection lens 400 and the optical axis AX to the lower side of the projection image G2 be L6. Also, let the distance from the intersection of the imaging lens 500 and the optical axis AY to the upper side of the projection image G2 be L7. Also, let the distance from the intersection of the imaging lens 500 and the optical axis AY to the lower side of the projection image G2 be L8.

[0026] FIG. 6 is a diagram showing a captured image C1 obtained by capturing the projection image G1 projected onto the screen SC in FIG. 4 using the imaging device 50 having the imaging lens 500, and an image CG1 recorded in the captured image C1. The image CG1 corresponds to the projection image G1 recorded in the captured image C1.

[0027] FIG. 7 is a diagram showing a captured image C2 obtained by capturing the projection image G2 projected onto the screen SC in FIG. 5 using the imaging device 50 having the imaging lens 500, and an image CG2 recorded in the captured image C2. The image CG2 corresponds to the projection image G2 recorded in the captured image C2. Hereinafter, the image CG1 and the image CG2 are collectively referred to as the image CG. In order to compare the shapes of the image CG1 and the image CG2, a similar shape CG1S of the image CG1 is shown by a dashed line in FIG. 7 so as to coincide with the lower side of the image CG2. Also, in FIGS. 6 and 7, the downward direction of the paper surface is the vertical direction.

[0028] Here, when the posture of the projector 1 changes from the state in FIG. 4 to the state in FIG. 5, the shape of the image CG1 changes like the image CG2. However, the ratio of the length of the upper side to the lower side in the image CG2 is smaller than the ratio of the length of the upper side to the lower side in the image CG1. Thus, since the shape of the projected image G captured changes with the change in the posture of the projector 1, it is possible to grasp the change in the posture of the projector 1 based on the change in the shape of the image CG recorded in the captured image C.

[0029] Note that when the ratio of the distance L6 to the distance L5 is larger than the ratio of the distance L2 to the distance L1, the ratio of the length of the upper side to the lower side in the projected image G2 is larger than the ratio of the length of the upper side to the lower side in the projected image G1. Also, when the ratio of the length of the upper side to the lower side in the projected image G2 is equal to the ratio of the length of the upper side to the lower side in the projected image G1, due to the effect of perspective projection, when the ratio of the distance L8 to the distance L7 is larger than the ratio of the distance L4 to the distance L3, the ratio of the length of the upper side to the lower side in the image CG2 is smaller than the ratio of the length of the upper side to the lower side in the image CG1. Based on the combination of the correspondence relationships as described above, the shape of the image CG1 recorded in the captured image C1 changes to the shape of the image CG2 recorded in the captured image C2.

[0030] 1.4. Operation of the Projector FIG. 8 is a flowchart for explaining the outline of the operation of the projector 1 according to the first embodiment. A series of operations shown in this flowchart are started, for example, when the power of the projector 1 is turned on and the communication unit 30 receives an image signal.

[0031] First, in step S101, the acquisition unit 11 acquires the image signal received by the communication unit 30. Next, in step S102, the processing unit 12 performs signal processing on the image signal acquired by the acquisition unit 11 to generate projection image information indicating the projection image G.

[0032] In step S103, the output unit 15 outputs the projection image information generated by the processing unit 12 to the projection unit 40. The projection unit 40 projects the projection image G onto the screen SC based on the projection image information. Note that the projection image G based on the projection image information output by the output unit 15 in step S103 may be referred to as the first image. In step S104, the acquisition unit 11 acquires reference imaging information. Here, the reference imaging information is imaging information JS indicating the captured image C obtained by capturing, with the imaging device 50, the first image projected onto the screen SC in step S103. Note that the timing at which the acquisition unit 11 acquires the imaging information JS in step S104 may be referred to as the first timing. Also, the imaging information JS acquired by the acquisition unit 11 in step S104 may be referred to as the first imaging information.

[0033] Thereafter, in step S105, the output unit 15 outputs the projection image information generated by the processing unit 12 to the projection unit 40. The projection unit 40 projects the projection image G onto the screen SC based on the projection image information. Note that the projection image G based on the projection image information output by the output unit 15 in step S105 may be referred to as the second image. In step S106, the acquisition unit 11 acquires comparison imaging information. Here, the comparison imaging information is imaging information JS indicating the captured image C obtained by capturing, with the imaging device 50, the second image projected onto the screen SC in step S105. Note that the timing at which the acquisition unit 11 acquires the imaging information JS in step S106 may be referred to as the second timing. Also, the imaging information JS acquired by the acquisition unit 11 in step S106 may be referred to as the second imaging information.

[0034] In step S107, the determination unit 14 determines whether the change in the posture of the projector 1 satisfies a certain standard based on the reference imaging information acquired by the acquisition unit 11 in step S104, the comparison imaging information acquired by the acquisition unit 11 in step S106, and the determination reference information JH stored in the storage unit 20. Then, in step S107, the determination unit 14 generates determination result information based on the result of the determination. If the result of the determination in step S107 is negative, that is, if it is NO in step S107, the control unit 10 advances the process to step S105. If the result of the determination in step S107 is positive, that is, if it is YES in step S107, the control unit 10 advances the process to step S108.

[0035] In step S108, the output unit 15 outputs output information JO based on the determination result information generated by the determination unit 14 in step S107. Then, the control unit 10 ends the series of operations shown in the flowchart.

[0036] FIG. 9 is a diagram showing output information JO1 which is an example of the output information JO output by the output unit 15 in step S108 of FIG. 8. The output information JO1 illustrated in FIG. 9 is image information for notifying that the posture of the projector 1 has changed. Note that the output information JO may be information for prompting the user to check the installation state of the projector 1 or information for prompting the user to keep a distance from the projector 1.

[0037] According to the first embodiment, when the change in the posture of the projector 1 satisfies a certain standard, by the output unit 15 outputting the output information JO, the user of the projector 1 can easily grasp that the posture of the projector 1 has changed. Therefore, it becomes easy to prevent the progress of the posture change of the projector 1. Further, according to the first embodiment, it becomes easy to suppress the deterioration of the image quality of the projected image G accompanying the change in the posture of the projector 1.

[0038] As described above, the control method of the projector 1 according to the first embodiment includes obtaining reference imaging information indicating the imaging result of the first image projected from the projector 1 at the first timing, obtaining comparison imaging information indicating the imaging result of the second image projected from the projector 1 at the second timing, determining whether the change in the posture of the projector 1 satisfies a certain standard based on the reference imaging information and the comparison imaging information, and outputting output information JO based on the determination result according to the result of the determination. In addition, the projector 1 according to the first embodiment includes an acquisition unit that acquires reference imaging information indicating the imaging result of the first image projected from the projector 1 at the first timing and comparison imaging information indicating the imaging result of the second image projected from the projector 1 at the second timing from the imaging device 50 fixed to the projector 1. 11 It further includes a determination unit 14 that determines whether the change in the posture of the projector 1 satisfies a certain standard based on the reference imaging information and the comparison imaging information, and an output unit 15 that outputs output information JO based on the determination result according to the determination result generated by the determination unit 14. Thereby, the user of the projector 1 can grasp that the posture of the projector 1 has changed.

[0039] 2. Second Embodiment Hereinafter, the second embodiment of the present invention will be described. In each of the embodiments exemplified below, for elements whose operations and functions are the same as those in the first embodiment, the reference numerals used in the description of the first embodiment are reused, and the detailed descriptions of each are appropriately omitted.

[0040] FIG. 10 is a block diagram showing a configuration example of the projector 1A according to the second embodiment. As shown in FIG. 10, the projector 1A is configured in the same manner as the projector 1 according to the first embodiment, except that it includes a control unit 10A instead of the control unit 10 and a storage unit 20A instead of the storage unit 20. Among these, the control unit 10A is configured in the same manner as the control unit 10 according to the first embodiment, except that it includes an analysis unit 16 and a posture determination unit 17 instead of the determination unit 14. Further, the storage unit 20A is configured in the same manner as the storage unit 20 according to the first embodiment, except that it stores a control program PGA instead of the control program PG. In the second embodiment, the control unit 10A functions as an acquisition unit 11, a processing unit 12, an analysis unit 16, a posture determination unit 17, and an output unit 15 by the CPU or the like included in the control unit 10A executing the control program PGA and operating according to the control program PGA.

[0041] Based on the imaging information JS acquired by the acquisition unit 11, the analysis unit 16 generates characteristic information indicating the characteristics of the projection image G recorded in the captured image C. The characteristic information includes information indicating the coordinates of the vertices, the area, and the lengths of the sides constituting the contour of the projection image G recorded in the captured image C. The analysis unit 16 can extract the four sides constituting the contour of the projection image G recorded in the captured image C, for example, by using edge detection processing, which is a known image processing method. Then, by extracting the intersection points of adjacent sides among the extracted sides as the vertices of the projection image G, the coordinates of the vertices of the projection image G recorded in the captured image C, which is one of the characteristic information, are generated.

[0042] Based on the plurality of characteristic information generated by the analysis unit 16 based on the plurality of imaging information JS, the posture determination unit 17 generates characteristic change information indicating the degree of difference between the plurality of characteristic information. Further, based on the generated characteristic change information and the determination reference information JH stored in the storage unit 20A, the posture determination unit 17 determines whether the change in the posture of the projector 1A satisfies a certain criterion. Furthermore, based on the result of the determination, the posture determination unit 17 generates determination result information. In the present embodiment, the determination result information includes, for example, information indicating that the posture of the projector 1A has changed, information indicating the direction of the change in the posture of the projector 1A, and information indicating the degree of the change in the posture of the projector 1A.

[0043] As described above, in the second embodiment, the control unit 10A provided in the projector 1A includes an analysis unit 16 and a posture determination unit 17 in addition to the acquisition unit 11, the processing unit 12, and the output unit 15. In the second embodiment, the analysis unit 16 and the posture determination unit 17 correspond to the determination unit.

[0044] FIG. 11 is a flowchart for explaining the outline of the operation of the projector 1A according to the second embodiment. The flowchart shown in FIG. 11 is the same as the flowchart shown in FIG. 8, except that the control unit 10A executes the processes of step S109, step S110, step S111, and step S112 instead of step S107.

[0045] In step S109, based on the first imaging information acquired by the acquisition unit 11 as the reference imaging information in step S104, the analysis unit 16 generates characteristic information indicating the characteristics of the first image as the reference characteristic information. In step S109, the characteristic information generated by the analysis unit 16 may be referred to as the first characteristic information. In step S110, based on the second imaging information acquired by the acquisition unit 11 as the comparison imaging information in step S106, the analysis unit 16 generates characteristic information indicating the characteristics of the second image as the comparison characteristic information. In step S110, the characteristic information generated by the analysis unit 16 may be referred to as the second characteristic information.

[0046] In step S111, based on the reference characteristic information generated by the analysis unit 16 in step S109 and the comparison characteristic information generated by the analysis unit 16 in step S110, the posture determination unit 17 generates characteristic change information indicating the degree of difference between the reference characteristic information and the comparison characteristic information.

[0047] In step S112, based on the characteristic change information generated by the posture determination unit 17 in step S111 and the determination reference information JH stored in the storage unit 20A, the posture determination unit 17 determines whether the change in the posture of the projector 1A satisfies a certain standard. Then, in step S112, based on the result of the determination, the posture determination unit 17 generates determination result information. If the result of the determination in step S112 is negative, that is, if it is NO in step S112, the control unit 10A advances the process to step S105. If the result of the determination in step S112 is positive, that is, if it is YES in step S112, the control unit 10A advances the process to step S108.

[0048] In step S108, the output unit 15 outputs output information JO based on the determination result information generated by the posture determination unit 17 in step S112. Then, the control unit 10A ends the series of operations shown in the flowchart.

[0049] According to the second embodiment, similar to the first embodiment, when the change in the posture of the projector 1A satisfies a certain standard, the output unit 15 outputs the output information JO. Therefore, it becomes possible to easily grasp the change in the posture of the projector 1A. As a result, it becomes possible to suppress a decrease in the image quality of the projected image G and prevent the failure and damage of the projector 1A.

[0050] As described above, the control method of the projector 1A according to the second embodiment generates reference characteristic information indicating the characteristics of the first image based on the reference imaging information, generates comparison characteristic information indicating the characteristics of the second image based on the comparison imaging information, and determines whether or not a change in the posture of the projector 1A satisfies a certain reference based on the reference characteristic information and the comparison characteristic information. Thereby, the user of the projector 1A can easily grasp the change in the posture of the projector 1A.

[0051] 3. Third Embodiment Hereinafter, a third embodiment of the present invention will be described. In each of the embodiments exemplified below, for elements whose operations and functions are the same as those of the second embodiment, the reference numerals used in the description of the second embodiment are reused, and the detailed description of each is appropriately omitted.

[0052] FIG. 12 is a diagram for explaining the outline of the projector 1A according to the third embodiment. The projector 1A is fixed to the ceiling WL via the mounting tools 9-1 and 9-2 shown in FIG. 12 and the mounting tools 9-3 and 9-4 not shown in FIG. 12. As shown in FIG. 12, the mounting tool 9-2 is installed on the front side of the projector 1A as compared with the mounting tool 9-1. The mounting tool 9-3 is installed in the depth direction of the paper surface of the mounting tool 9-1, and the mounting tool 9-4 is installed in the depth direction of the paper surface of the mounting tool 9-2. In the third embodiment, the mounting tools 9-1, 9-2, 9-3, and 9-4 are collectively referred to as the mounting tool 9. Each of the mounting tools 9-1, 9-2, 9-3, and 9-4 includes a dedicated fixing tool, male and female screws for fixing the dedicated fixing tool to the ceiling WL, and male and female screws for fixing the projector 1A to the dedicated fixing tool.

[0053] FIG. 13 is a flowchart for explaining the outline of the operation of the projector 1A according to the third embodiment. The series of operations shown in this flowchart are executed in the projector 1A having the configuration shown in FIG. 10. The flowchart shown in FIG. 13 is the same as the flowchart shown in FIG. 11, except that the control unit 10A executes the process of step S113 instead of step S108.

[0054] In step S113, the output unit 15 outputs output information JO based on the determination result information generated by the attitude determination unit 17 in step S112. Then, the control unit 10A ends the series of operations shown in the flowchart.

[0055] Note that the determination result information generated by the attitude determination unit 17 in step S112 includes information indicating that the attitude of the projector 1A has changed and information indicating the direction of the change in the attitude of the projector 1A. The output unit 15 can output output information JO including information on the installation tool that affects the change in the attitude of the projector 1A based on the correspondence relationship information and the determination result information. Here, the correspondence relationship information is information indicating the correspondence relationship between the direction of the change in the attitude of the projector 1A and the installation tool presumed to cause the change in the attitude of the projector 1A. The correspondence relationship information may be stored in the storage unit 20A.

[0056] Hereinafter, it will be explained that the determination result information includes information indicating the direction of the change in the attitude of the projector 1A.

[0057] FIG. 14 is a diagram illustrating a state in which the attitude of the projector 1A has changed. For convenience of illustration, in FIG. 14, the description of the imaging lens 500, the optical axis AY, the distance L7, and the distance L8 is omitted. For example, when the front of the projector 1A is tilted vertically, the case where the front of the projector 1A is tilted vertically is defined as tilting in the negative direction. On the other hand, the case where the front of the projector 1A is tilted in the opposite direction to the vertical direction is defined as tilting in the positive direction. FIG. 14 shows that the projector 1A is tilted in the positive direction. In FIG. 14, the optical axis AX is shifted in the positive direction by an amount Θ from the position AXO of the optical axis before the posture of the projector 1A changes. A Here, when the projector 1A is tilted in the positive direction, the change in the posture of the projector 1A is denoted as Θ. A Also, when the projector 1A is tilted in the negative direction, the change in the posture of the projector 1A is denoted as -Θ. A Here, in step S112, when determining whether the change in the posture of the projector 1A satisfies a certain criterion, the condition for the determination result to be affirmative is -Θ A ≦ -Θ T1 or Θ T2 ≦ Θ A which can be set. Here, -Θ T1 and Θ T2 are threshold values for determining whether the change in the posture of the projector 1A satisfies a certain criterion. Also, Θ A , Θ T1 and Θ T2 all take positive values. The determination result information includes a first variable, a second variable, and a third variable. The first variable becomes 1 when -Θ A ≦ -Θ T1 is satisfied, and becomes 0 when not satisfied. The second variable becomes 1 when Θ T2 ≦ Θ A is satisfied, and becomes 0 when not satisfied. The third variable becomes 1 when -Θ T1 < -Θ A and Θ A < Θ T2 are satisfied, and becomes 0 when not satisfied. The first variable and the second variable included in the determination result information are information indicating the direction of the change in the posture of the projector 1A.

[0058] FIG. 15 is a diagram showing output information JO2 which is an example of output information JO output by the output unit 15 in step S113 of FIG. 13. The output information JO2 illustrated in FIG. 15 is image information showing information on the installation tool that is presumed to affect the change in the posture of the projector 1A.

[0059] According to the third embodiment, when the change in the posture of the projector 1A satisfies a certain standard, the output unit 15 outputs output information JO including information on the installation tool that affects the change in the posture of the projector 1A. For this reason, in addition to being able to grasp that the posture of the projector 1A has changed, the user of the projector 1A can easily identify the installation tool 9 that is presumed to affect the change in the posture of the projector 1A. As a result, in addition to the same effects as those of the first embodiment and the second embodiment, it contributes to the improvement of the maintainability of the projector 1A.

[0060] As described above, the projector 1A according to the third embodiment is fixed to the installation position by the installation tool 9 including the installation tool 9-1, the installation tool 9-2, the installation tool 9-3, and the installation tool 9-4. The control method of the projector 1A determines whether or not the change in the posture of the projector 1A satisfies a certain standard based on the reference characteristic information and the comparison characteristic information, and according to the result of the determination, outputs information on the installation tool 9 that affects the change in the posture of the projector 1A from among the installation tools 9. Thereby, the user of the projector 1A can grasp that the posture of the projector 1A has changed. In addition, the user of the projector 1A can easily identify the installation tool 9 that is presumed to affect the change in the posture of the projector 1A.

[0061] 4. Fourth Embodiment Hereinafter, a fourth embodiment of the present invention will be described. In each of the embodiments exemplified below, for elements whose operations and functions are the same as those of the third embodiment, the reference numerals used in the description of the third embodiment are reused and the detailed description of each is omitted as appropriate.

[0062] FIG. 16 is a flowchart for explaining the outline of the operation of the projector 1A according to the fourth embodiment. A series of operations shown in this flowchart are executed in the projector 1A having the configuration shown in FIG. 10. In the fourth embodiment, the determination reference information JH includes first threshold information indicating a first threshold and second threshold information indicating a second threshold larger than the first threshold, as information regarding a threshold for determining whether or not a change in the posture of the projector 1A satisfies a certain standard. The flowchart shown in FIG. 16 is the same as the flowchart shown in FIG. 11, except that the control unit 10A executes the processes of step S114, step S115, step S116, step S117, and step S118 instead of step S112 and step S108.

[0063] In step S114, the posture determination unit 17 specifies the amount of change in the posture of the projector 1A from the characteristic change information generated by the posture determination unit 17 in step S111.

[0064] In step S115, the posture determination unit 17 determines whether or not the amount of change in the posture of the projector 1A is equal to or greater than the first threshold based on the amount of change in the posture of the projector 1A specified by the posture determination unit 17 in step S114 and the determination reference information JH stored in the storage unit 20A. If the result of the determination in step S115 is negative, that is, if it is NO in step S115, the control unit 10A advances the process to step S105. If the result of the determination in step S115 is positive, that is, if it is YES in step S115, the control unit 10A advances the process to step S116.

[0065] In step S116, the posture determination unit 17 determines whether the amount of change in the posture of the projector 1A identified by the posture determination unit 17 in step S114 is equal to or greater than a second threshold value, based on the amount of change in the posture of the projector 1A and the determination reference information JH stored in the storage unit 20A. Then, in step S116, the posture determination unit 17 generates determination result information based on the result of the determination. If the result of the determination in step S116 is negative, that is, if it is NO in step S116, the control unit 10A advances the process to step S118. If the result of the determination in step S116 is positive, that is, if it is YES in step S116, the control unit 10A advances the process to step S117. Note that the state in which the result of the determination in step S116 is negative may be referred to as a first state. Also, the state in which the result of the determination in step S116 is positive may be referred to as a second state.

[0066] In step S117, the output unit 15 outputs output information JO based on the determination result information generated by the posture determination unit 17 in step S116. Then, the control unit 10A ends the series of operations shown in the flowchart. Note that the output information JO output in step S117 may be referred to as second output information. In step S118, the output unit 15 outputs output information JO based on the determination result information generated by the posture determination unit 17 in step S116. Then, the control unit 10A ends the series of operations shown in the flowchart. Note that the output information JO output in step S118 may be referred to as first output information.

[0067] FIG. 17 is a diagram showing output information JO3 which is an example of the first output information. The output information JO3 illustrated in FIG. 17 is image information for notifying that the posture of the projector 1A may have changed. Note that, as an example of the second output information, output information JO1 illustrated in FIG. 9 can be cited. Here, it is preferable that the second output information output in step S117 includes information that more strongly prompts confirmation of the installation state of the projector 1A as compared with the first output information output in step S118. Further, the second output information output in step S117 may include information that more strongly prompts keeping a distance from the projector 1A as compared with the first output information output in step S118.

[0068] According to the fourth embodiment, by the output unit 15 outputting output information JO including different contents according to the amount of change in the posture of the projector 1A, the user of the projector 1A can grasp not only that the posture of the projector 1A has changed, but also the degree of change in the posture of the projector 1A becomes easy to grasp. As a result, there is an advantage that it becomes possible to more appropriately select a response according to the content of the output information JO.

[0069] As described above, the control method of the projector 1A according to the fourth embodiment specifies the amount of change in the posture of the projector 1A based on the reference characteristic information and the comparison characteristic information, and when the amount of change in the posture of the projector 1A is equal to or greater than the first threshold value and less than the second threshold value, it is determined as the first state, and when the amount of change in the posture of the projector 1A is equal to or greater than the second threshold value, it is determined as the second state, and when it is determined as the first state, the first output information is output, and when it is determined as the second state, the second output information is output. Thereby, the user of the projector 1A can grasp that the posture of the projector 1A has changed. Further, the user of the projector 1A can easily grasp the degree of change in the posture of the projector 1A.

[0070] 5. Modification Each of the above forms can be variously modified. Specific modification modes are exemplified below. Also, two or more modes arbitrarily selected from the following examples can be appropriately combined within a range where they do not conflict with each other. In the modification examples exemplified below, for elements whose actions and functions are equivalent to those of the above-described embodiments, the reference numerals used in the above description are reused, and the detailed description of each is appropriately omitted.

[0071] 5.1. Modification Example 1 In the above-described embodiment, the imaging device 50 is fixed to the projector 1 or the projector 1A, and when a change in the posture of the projector 1 or the projector 1A occurs, the imaging device 50 obtains the imaging image C without changing the relative positional relationship between the imaging lens 500 and the projection lens 400. This has been exemplified and described, but the present invention is not limited to such a mode. The imaging device 50 may be fixed at a location other than the projector 1 or the projector 1A, and when a change in the posture of the projector 1 or the projector 1A occurs, the relative positional relationship between the imaging lens 500 and the projection lens 400 of the imaging device 50 may change.

[0072] FIG. 18 is a diagram for explaining the outline of the projector 1B according to Modification Example 1. As shown in FIG. 18, the projection image G is imaged by the imaging device 50B fixed at a location other than the projector 1B. The imaging device 50B obtains the imaging image CB.

[0073] FIG. 19 is a block diagram showing a configuration example of the projector 1B according to Modification Example 1. As shown in FIG. 19, the projector 1B is configured in the same manner as the projector 1 according to the first embodiment, except that it includes a storage unit 20B instead of the storage unit 20 and does not include the imaging device 50 in the projector 1B. An imaging device 50B is fixed outside the projector 1B. Among these, the storage unit 20B is configured in the same manner as the storage unit 20 according to the first embodiment, except that it stores the determination reference information JHB instead of the determination reference information JH and stores the imaging information JSB instead of the imaging information JS.

[0074] The imaging device 50B is fixed at a location other than the projector 1B and images the projection image G projected onto the screen SC. Thereby, the imaging device 50B acquires the captured image CB. Since the imaging device 50B is fixed at a position different from that of the projector 1B, it is not necessary to move the imaging location along with the change in the posture of the projector 1B, and the captured image CB may be acquired in a state where the relative positional relationship between the imaging lens 500B and the projection lens 400 of the imaging device 50B has changed. Also, the imaging device 50B may transmit the imaging information JSB, which is information indicating the captured image CB, to the projector 1B by wire or wirelessly.

[0075] FIGS. 20 and 21 are diagrams showing the state of image projection and imaging of the projection image of the projector 1B according to Modification 1.

[0076] FIG. 20 is a diagram showing the positional relationship among the screen SC, the projection lens 400, and the imaging lens 500B. Here, the optical axis AX of the projection lens 400 intersects the screen SC vertically. On the other hand, as shown in FIG. 20, the optical axis AX of the projection lens 400 and the optical axis AZ of the imaging lens 500B do not have to be parallel. Also, FIG. 20 shows that the imaging lens 500B is provided at a position different from the projection lens 400 in the vertical direction. In FIG. 20, the projection image G projected from the projection unit 40 to the screen SC is referred to as the projection image G1. As shown in FIG. 20, let the distance from the intersection of the projection lens 400 and the optical axis AX to the upper side of the projection image G1 be L1. Also, let the distance from the intersection of the projection lens 400 and the optical axis AX to the lower side of the projection image G1 be L2. Also, let the distance from the intersection of the imaging lens 500B and the optical axis AZ to the upper side of the projection image G1 be L9. Also, let the distance from the intersection of the imaging lens 500B and the optical axis AZ to the lower side of the projection image G1 be L10.

[0077] FIG. 21 shows a state in which the posture of the projector 1B has changed from the state of FIG. 20, and the intersection of the optical axis AX and the screen SC has moved in the direction opposite to the vertical direction with respect to the intersection of the optical axis AX and the projection lens 400. Here, the imaging device 50B having the imaging lens 500B is fixed at a location other than the projector 1B, and the point where the optical axis AZ of the screen SC and the imaging lens 500B intersect does not change from the position in FIG. 20. In FIG. 21, the projection image G projected from the projection unit 40 to the screen SC is referred to as a projection image G2. As shown in FIG. 21, let the distance from the intersection of the projection lens 400 and the optical axis AX to the upper side of the projection image G2 be L5. Also, let the distance from the intersection of the projection lens 400 and the optical axis AX to the lower side of the projection image G2 be L6. Also, let the distance from the intersection of the imaging lens 500B and the optical axis AZ to the upper side of the projection image G2 be L11. Also, let the distance from the intersection of the imaging lens 500B and the optical axis AZ to the lower side of the projection image G2 be L12.

[0078] When the posture of the projector 1B changes from the state of FIG. 20 to the state of FIG. 21, as described in section 1.3, the shape of the projection image G recorded in the captured image CB changes based on the ratio of the distance L1 to the distance L2, the ratio of the distance L5 to the distance L6, the ratio of the distance L9 to the distance L10, and the ratio of the distance L11 to the distance L12. Similar to the first embodiment, since the shape of the captured projection image changes with the change in the posture of the projector 1B, based on the change in the shape of the image recorded in the captured image, the projector 1B can grasp the change in posture.

[0079] As described above, the projector 1B according to the first modification example includes an acquisition unit that acquires first imaging information indicating an imaging result of a first image projected from the projector 1B at a first timing and second imaging information indicating an imaging result of a second image projected from the projector 1B at a second timing from an imaging device fixed at a location other than the projector 1B, a determination unit that determines whether or not a change in the posture of the projector 1B satisfies a certain standard based on the reference imaging information and the comparison imaging information, and an output unit that outputs output information JO based on the determination result in accordance with the determination result generated by the determination unit. Accordingly, the user of the projector 1B can grasp that the posture of the projector 1B has changed.

[0080] 5.2. Second Modification Example In the foregoing embodiment and the first modification example, the characteristic information has been described by way of example as including the coordinates of the vertices, the area, and the lengths of the sides constituting the contour of the projection image G recorded in the captured image C. However, the present invention is not limited to such an aspect. The characteristic information may be information indicating an angle formed by two or more sides constituting the contour of the projection image G recorded in the captured image C.

[0081] FIG. 22 is a diagram showing a captured image C3 obtained before the posture of the projector 1A changes and an image CG3 recorded in the captured image C3. The image CG3 is obtained by recording, in the captured image C3, a projection image G3 projected onto the screen SC before the posture of the projector 1A changes. As shown in FIG. 22, the image CG3 has sides S31, S32, S33, and S34. Among the angles formed by adjacent sides S31 and S32, the interior angle of the image CG3 is called angle A312. Among the angles formed by adjacent sides S32 and S33, the interior angle of the image CG3 is called angle A323. Among the angles formed by adjacent sides S33 and S34, the interior angle of the image CG3 is called angle A334. Among the angles formed by adjacent sides S31 and S34, the interior angle of the image CG3 is called angle A314. In the second modification, the side S31 is an example of the first side, and the side S32 is an example of the second side. The angle of angle A312 is an example of the first angle.

[0082] FIG. 23 is a diagram showing a captured image C4 obtained after the posture of the projector 1A changes and an image CG4 recorded in the captured image C4. The image CG4 is obtained by recording, in the captured image C4, a projection image G4 projected onto the screen SC after the posture of the projector 1A changes. As shown in FIG. 23, the image CG4 has sides S41, S42, S43, and S44. The side S41 corresponds to the side S31. The side S42 corresponds to the side S32. Among the angles formed by adjacent sides S41 and S42, the interior angle of the image CG4 is called angle A412. Among the angles formed by adjacent sides S42 and S43, the interior angle of the image CG4 is called angle A423. Among the angles formed by adjacent sides S43 and S44, the interior angle of the image CG4 is called angle A434. Among the angles formed by adjacent sides S41 and S44, the interior angle of the image CG4 is called angle A414. In the second modification, the side S41 is an example of the third side, and the side S42 is an example of the fourth side. The angle of angle A412 is an example of the second angle.

[0083] In Modification 2, in step S109 of the flowchart shown in FIG. 11, the analysis unit 16 generates the angle of angle A312 as reference characteristic information. Also, in step S110, the analysis unit 16 generates the angle of angle A412 as comparison characteristic information.

[0084] Then, in step S111, the attitude determination unit 17 generates characteristic change information indicating the degree of difference between the angle of angle A312 indicated by the reference characteristic information and the angle of angle A412 indicated by the comparison characteristic information.

[0085] Thereafter, in step S112, the attitude determination unit 17 determines whether the change in the attitude of the projector 1A satisfies a certain standard based on the degree of difference between the angle of angle A312 and the angle of angle A412 indicated by the characteristic change information.

[0086] As described above, in the control method of the projector 1A according to Modification 2, the reference characteristic information includes information indicating a first angle formed by a first side and a second side that are adjacent to each other among two or more sides constituting the contour of the first image, and the comparison characteristic information includes information indicating a second angle formed by a third side corresponding to the first side and a fourth side corresponding to the second side among two or more sides constituting the contour of the second image, and it is characterized in that it is determined whether the change in the attitude of the projector 1A satisfies a certain standard based on the degree of difference between the first angle and the second angle. Thereby, the user of the projector 1A can easily grasp the change in the attitude of the projector 1A.

[0087] 5.3. Modification 3 In the foregoing embodiments and Modification 1, the case where the characteristic information includes the coordinates of the vertices, the area, and the lengths of the sides constituting the contour of the projection image G recorded in the captured image C has been exemplified and described, but the present invention is not limited to such an aspect. The characteristic information may be information based on the brightness of two or more sides constituting the contour of the projection image G recorded in the captured image C.

[0088] As described above, the shape of the projected image G recorded in the captured image C changes as the posture of the projector 1 changes. However, not only the shape of the projected image G recorded in the captured image C, but also the brightness of two or more sides that form the contour of the projected image G recorded in the captured image C changes as the posture of the projector 1 changes. This is because, as shown in FIG. 4, as the distances L1, L2, L5, and L6 and the distances L3, L4, L7, and L8 change, the brightness of the projected image G on the screen SC and the amount of light reflected from the screen SC and reaching the imaging lens 500 change. Since the brightness information recorded in the captured image C changes as the posture of the projector 1 changes, based on the change in the brightness of two or more sides that form the contour of the projected image G recorded in the captured image C, the change in the posture of the projector 1 can be grasped.

[0089] In Modification 3, the acquisition unit 11 acquires, in step S104 of the flowchart shown in FIG. 11, the imaging information JS, which is information indicating the captured image C3 shown in FIG. 22 described above, as the reference imaging information. As shown in FIG. 22, the image CG3 has sides S31, S32, S33, and S34. In Modification 3, side S31 is an example of the first side, and side S33 is an example of the second side.

[0090] In Modification 3, the acquisition unit 11 acquires, in step S106 of the flowchart shown in FIG. 11, the imaging information JS, which is information indicating the captured image C4 shown in FIG. 23 described above, as the comparison imaging information. As shown in FIG. 23, the image CG4 has sides S41, S42, S43, and S44. Side S41 corresponds to side S31. Also, side S43 corresponds to side S33. In Modification 3, side S41 is an example of the third side, and side S43 is an example of the fourth side.

[0091] In Modification 3, in step S109 of the flowchart shown in FIG. 11, the analysis unit 16 generates the first difference information as reference characteristic information. Further, in step S110 of the flowchart shown in FIG. 11, the analysis unit 16 generates the second difference information as comparison characteristic information. Here, the first difference information is information indicating the degree of difference between the brightness of side S31 and the brightness of side S33. The second difference information is information indicating the degree of difference between the brightness of side S41 and the brightness of side S43. Note that the first difference information and the second difference information may be the difference in brightness between the two target sides or the ratio of the brightness of the two sides.

[0092] Note that, for the brightness of each side constituting the contour of image CG3 and image CG4, the average value of the luminance of the pixels constituting image CG3 or image CG4 included in the range of the rectangle having each side as one side of the long side may be approximately used. Here, the rectangle having each side as one side of the long side is assumed to have a short side length that is sufficiently small compared to the long side, and the range is set so that the pixels constituting image CG3 or image CG4 included in the range of the rectangle having each side as one side of the long side are the most numerous.

[0093] Then, in step S111, the posture determination unit 17 generates characteristic change information indicating the degree of difference between the first difference information indicated by the reference characteristic information and the second difference information indicated by the comparison characteristic information.

[0094] Thereafter, in step S112, the posture determination unit 17 determines whether or not the change in the posture of the projector 1A satisfies a certain criterion based on the degree of difference between the first difference information and the second difference information indicated by the characteristic change information.

[0095] As described above, in the control method of the projector 1A according to the third modification, the reference characteristic information includes first difference information indicating the degree of difference between the brightness of the first side and the brightness of the second side among two or more sides constituting the contour of the first image. The contrast characteristic information includes second difference information indicating the degree of difference between the brightness of the third side corresponding to the first side and the brightness of the fourth side corresponding to the second side among two or more sides constituting the contour of the second image. Based on the first difference information and the second difference information, it is determined whether the change in the posture of the projector 1A satisfies a certain criterion. This is the feature. Thereby, the user of the projector 1A can easily grasp the change in the posture of the projector 1A.

[0096] 5.4. Third Modification In the above-described embodiments and modifications, the output information JO has been described by way of example as being output as image information. However, the output information JO is not limited to being projected onto the screen SC as the projection image G or being displayed on the entire surface of a display or the like provided in an external terminal. The output information JO may be displayed on a part of the projection image G or a display or the like.

[0097] FIG. 24 is a diagram showing output information JO4, which is an example of output information JO output using an on-screen display on a part of the projection image G projected onto the screen SC. The output information JO4 illustrated in FIG. 24 is displayed superimposed on the upper right of the projection image G. Note that the output information JO displayed on a part of the projection image G or a display or the like may be character information.

[0098] 5.5. Fourth Modification In the above-described embodiments and modifications, projectors such as the projector 1, the projector 1A, and the projector 1B may be provided with a touch panel that displays an operation screen GS for the user of the projector to input an operation on the projector. Further, the projector may be configured to display the operation screen GS by projecting it from the projection unit 40 onto the screen SC, and the user of the projector may input an operation on the operation screen GS using a remote controller (not shown).

[0099] Figure 25 is an explanatory diagram showing an example of the operation screen GS. As shown in Figure 25, the operation screen GS has a button B11 for specifying the execution of an operation in which the projector determines whether a change in the posture of the projector satisfies a certain standard, and a button B12 for specifying the stop of the operation. Further, the operation screen GS has a button B2 for specifying that the current posture of the projector is to be used as the reference posture. It is assumed that when the projector is in the reference posture, imaging information JS indicating an imaging image C obtained by the projector projecting a projection image G on the screen SC and the imaging device 50 imaging the projection image G can be regarded as reference imaging information.

[0100] The operation screen GS has an input area M3 for inputting the text indicated by the output information JO. Further, the operation screen GS has check boxes B41 to B43 for setting the notification method of the output information JO. When the user of the projector checks the check box B41, the output information JO is output as the projection image G. When the user of the projector checks the check box B42, the output information JO is output by voice. When the user of the projector checks the check box B43, the output information JO is notified to the mobile terminal possessed by the user of the projector.

[0101] The operation screen GS has radio buttons B51 to B52 for setting a method for determining whether a change in the posture of the projector satisfies a certain standard. When the user of the projector selects the radio button B51, the control unit provided in the projector determines whether a change in the posture of the projector satisfies a certain standard based on the shape of the image CG recorded in the imaging image C. On the other hand, when the user of the projector selects the radio button B52, the control unit provided in the projector determines whether a change in the posture of the projector satisfies a certain standard based on the brightness of the image CG recorded in the imaging image C.

[0102] The operation screen GS has a button B6 for ending the input of operations for the projector.

Description of Signs

[0103] 1…Projector, 1A…Projector, 1B…Projector, 9…Mounting tool, 10…Control unit, 20…Storage unit, 30…Communication unit, 40…Projection unit, 400…Projection lens, 50…Imaging device, 500…Imaging lens, G…Projection image, C…Captured image, CG…Image, SC…Screen, AX…Optical axis, AY…Optical axis, AZ…Optical axis

Claims

1. Obtaining first imaging information indicating an imaging result of a first image projected from a projector at a first timing; Obtaining second imaging information indicating an imaging result of a second image projected from the projector at a second timing; Generating first characteristic information indicating characteristics of the first image based on the first imaging information; Generating second characteristic information indicating characteristics of the second image based on the second imaging information; Determining whether a change in the posture of the projector satisfies a certain criterion based on the first characteristic information and the second characteristic information; Outputting information based on the result of the determination according to the result of the determination, including, The first characteristic information includes information indicating a first angle formed by a first side and a second side that are adjacent to each other among two or more sides constituting the contour of the first image; The second characteristic information includes information indicating a second angle formed by a third side corresponding to the first side and a fourth side corresponding to the second side among two or more sides constituting the contour of the second image; Determining whether a change in the posture of the projector satisfies a certain criterion based on the degree of difference between the first angle and the second angle, characterized in that it is a control method for a projector.

2. Obtaining first imaging information indicating an imaging result of a first image projected from a projector at a first timing; Obtaining second imaging information indicating an imaging result of a second image projected from the projector at a second timing; Generating first characteristic information indicating characteristics of the first image based on the first imaging information; Generating second characteristic information indicating characteristics of the second image based on the second imaging information; Determining whether a change in the posture of the projector satisfies a certain criterion based on the first characteristic information and the second characteristic information; Outputting information based on the result of the determination according to the result of the determination, including, The first characteristic information includes first difference information indicating the degree of difference between the brightness of a first side and the brightness of a second side among two or more sides constituting the contour of the first image; The second characteristic information includes second difference information indicating the degree of difference between the brightness of a third side corresponding to the first side and the brightness of a fourth side corresponding to the second side among two or more sides constituting the contour of the second image; A method for controlling a projector, characterized by determining whether a change in the posture of the projector satisfies a certain criterion based on the first difference information and the second difference information.

3. Obtaining first imaging information indicating an imaging result of a first image projected from a projector at a first timing; Obtaining second imaging information indicating an imaging result of a second image projected from the projector at a second timing; Generating first characteristic information indicating characteristics of the first image based on the first imaging information; Generating second characteristic information indicating characteristics of the second image based on the second imaging information; Determining whether a change in the posture of the projector satisfies a certain criterion based on the first characteristic information and the second characteristic information; Outputting information based on the result of the determination according to the result of the determination; including The projector is fixed at an installation position by two or more installation tools, Based on the first characteristic information and the second characteristic information, it is determined whether a change in the posture of the projector satisfies a certain criterion, A method for controlling a projector, characterized in that according to the result of the determination, information on the installation tool that affects the change in the posture of the projector is output from among the two or more installation tools.

4. Based on the first characteristic information and the second characteristic information, specifying the amount of change in the posture of the projector, When the amount of change in the posture of the projector is equal to or greater than a first threshold value and less than a second threshold value greater than the first threshold value, it is determined as a first state, When the amount of change in the posture of the projector is equal to or greater than the second threshold value, it is determined as a second state, Outputting first output information when it is determined as the first state, and outputting second output information when it is determined as the second state. The method for controlling a projector according to any one of claims 1 to 3, characterized in that.

5. A projector, From an imaging device fixed to the projector, An acquisition unit that acquires first imaging information indicating an imaging result of a first image projected from the projector at a first timing, and second imaging information indicating an imaging result of a second image projected from the projector at a second timing; An analysis unit that generates first characteristic information indicating characteristics of the first image based on the first imaging information and generates second characteristic information indicating characteristics of the second image based on the second imaging information; ​ ​ A determination unit that determines whether a change in the posture of the projector satisfies a certain criterion based on the first characteristic information and the second characteristic information; An output unit that outputs information based on the determination result according to the determination result generated by the determination unit; having; The first characteristic information includes information indicating a first angle formed by a first side and a second side that are adjacent to each other among two or more sides constituting the contour of the first image; The second characteristic information includes information indicating a second angle formed by a third side corresponding to the first side and a fourth side corresponding to the second side among two or more sides constituting the contour of the second image; The determination unit determines whether a change in the posture of the projector satisfies a certain criterion based on the degree of difference between the first angle and the second angle. A projector characterized by this.

6. A projector, From the imaging device fixed to the projector, First imaging information indicating the imaging result of the first image projected from the projector at the first timing; An acquisition unit that acquires second imaging information indicating the imaging result of the second image projected from the projector at the second timing; Based on the first imaging information, generate first characteristic information indicating the characteristics of the first image, An analysis unit that generates second characteristic information indicating the characteristics of the second image based on the second imaging information; A determination unit that determines whether a change in the posture of the projector satisfies a certain criterion based on the first characteristic information and the second characteristic information; An output unit that outputs information based on the determination result according to the determination result generated by the determination unit; having; The first characteristic information includes first difference information indicating the degree of difference between the brightness of the first side and the brightness of the second side among two or more sides constituting the contour of the first image; The second characteristic information includes second difference information indicating the degree of difference between the brightness of the third side corresponding to the first side and the brightness of the fourth side corresponding to the second side among two or more sides constituting the contour of the second image; The determination unit determines whether a change in the posture of the projector satisfies a certain criterion based on the first difference information and the second difference information. A projector characterized by this.

7. A projector, From the imaging device fixed to the projector, First imaging information indicating the imaging result of the first image projected from the projector at the first timing; An acquisition unit that acquires second imaging information indicating an imaging result of a second image projected from the projector at a second timing; Based on the first imaging information, generate first characteristic information indicating the characteristics of the first image; An analysis unit that generates second characteristic information indicating the characteristics of the second image based on the second imaging information; A determination unit that determines whether a change in the posture of the projector satisfies a certain criterion based on the first characteristic information and the second characteristic information; An output unit that outputs information based on the determination result according to the determination result generated by the determination unit; having; The projector is fixed at an installation position by two or more installation tools; Based on the first characteristic information and the second characteristic information, determine whether a change in the posture of the projector satisfies a certain criterion; The determination unit outputs information on the installation tool that affects the change in the posture of the projector from among the two or more installation tools according to the determination result. A projector characterized by this.

8. A projector, From an imaging device fixed at a location other than the projector, First imaging information indicating an imaging result of a first image projected from the projector at a first timing; An acquisition unit that acquires second imaging information indicating an imaging result of a second image projected from the projector at a second timing; Based on the first imaging information, generate first characteristic information indicating the characteristics of the first image; An analysis unit that generates second characteristic information indicating the characteristics of the second image based on the second imaging information; A determination unit that determines whether a change in the posture of the projector satisfies a certain criterion based on the first characteristic information and the second characteristic information; An output unit that outputs information based on the determination result according to the determination result generated by the determination unit; having; The first characteristic information includes information indicating a first angle formed by a first side and a second side that are adjacent to each other among two or more sides that form the contour of the first image; The second characteristic information includes information indicating a second angle formed by a third side corresponding to the first side and a fourth side corresponding to the second side among two or more sides that form the contour of the second image; The determination unit determines whether a change in the posture of the projector satisfies a certain criterion based on the degree of difference between the first angle and the second angle. A projector characterized by this.

9. A projector, From an imaging device fixed at a location other than the projector, First imaging information indicating the imaging result of the first image projected from the projector at the first timing, An acquisition unit that acquires second imaging information indicating the imaging result of the second image projected from the projector at the second timing; Based on the first imaging information, generate first characteristic information indicating the characteristics of the first image, An analysis unit that generates second characteristic information indicating the characteristics of the second image based on the second imaging information; A determination unit that determines whether a change in the posture of the projector satisfies a certain standard based on the first characteristic information and the second characteristic information; An output unit that outputs information based on the determination result according to the determination result generated by the determination unit, having, The first characteristic information includes first difference information indicating the degree of difference between the brightness of the first side and the brightness of the second side among two or more sides constituting the contour of the first image, The second characteristic information includes second difference information indicating the degree of difference between the brightness of the third side corresponding to the first side and the brightness of the fourth side corresponding to the second side among two or more sides constituting the contour of the second image, The determination unit determines whether a change in the posture of the projector satisfies a certain standard based on the first difference information and the second difference information. A projector characterized by this.

10. A projector, From an imaging device fixed at a location other than the projector, First imaging information indicating the imaging result of the first image projected from the projector at the first timing, An acquisition unit that acquires second imaging information indicating the imaging result of the second image projected from the projector at the second timing; Based on the first imaging information, generate first characteristic information indicating the characteristics of the first image, An analysis unit that generates second characteristic information indicating the characteristics of the second image based on the second imaging information; A determination unit that determines whether a change in the posture of the projector satisfies a certain standard based on the first characteristic information and the second characteristic information; An output unit that outputs information based on the determination result according to the determination result generated by the determination unit, having, The projector is fixed at the installation position by two or more installation tools, Based on the first characteristic information and the second characteristic information, determine whether a change in the posture of the projector satisfies a certain standard, The projector is characterized in that the determination unit outputs information on the fixture that affects the change in the posture of the projector from among the two or more fixtures according to the result of the determination.

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