JP5810590B2 - Projector and projection method - Google Patents

Description

  The present invention relates to a projector and a projection method.

  In the case of a television, since it is used in a relatively small room and the size of the image is fixed, an optimal observation position for viewing 3D video or the like need not be considered much. On the other hand, in the case of a projector, since it is used in a room of various sizes and the size of an image is also variable, it is necessary to sufficiently consider an optimal observation position. Specifically, in order to optimally observe a 3D image, it is necessary to observe at a position three times the length of the displayed image in the vertical direction. For example, in Japanese Patent Application Laid-Open No. 2000-140442, an image display device that detects the head position of an observer and drives the seat surface up and down according to the head position in order to correspond to the sitting height and height of the observer of the image. Is described.

JP 2000-140442 A

  However, in the technique disclosed in Japanese Patent Laid-Open No. 2000-140442, it is necessary to prepare a seating surface that can be driven up and down for each observer, and since the adjustment range of the observation position is narrow, an unspecified number of observers have various sizes. It is not possible to appropriately cope with the usage status of the projector that observes the image in the room.

  Some embodiments according to the present invention provide a projector and a projection method that can suggest an appropriate observation state to an image observer by solving the above-described problems.

  A projector that is one aspect of the present invention includes a projection unit that projects an image onto a projection target, a focus adjustment value and a zoom adjustment value related to the projection unit, an aspect ratio of the image, or an imaging signal value obtained by imaging. Based on the image size determination unit that determines an image size related to the size of the image, and based on the image size determined by the image size determination unit, a suggestion image that suggests an appropriate observation position for the projection unit And a control unit that performs control for projection.

  According to another aspect of the present invention, there is provided a projection method in which a projector including a projection unit that projects an image onto a projection target includes a focus adjustment value and a zoom adjustment value related to the projection unit, an aspect ratio of the image, or An image size related to the size of the image is determined based on an imaging signal value obtained by imaging, and based on the image size, the projection unit is controlled to project a suggestion image that suggests an appropriate observation position, and the suggestion It is characterized by projecting an image.

  According to the present invention, the projector can project a suggestion image that suggests an observation position suitable for the image size, so that it is possible to suggest an appropriate observation state to the observer of the image.

  According to another aspect of the invention, there is provided a projector that projects an image onto a projection target and projects the image onto the projection target based on a focus adjustment value related to the projection unit or an imaging signal value obtained by imaging. A viewing distance determination unit that determines a viewing distance that is a distance from an image to an observation position of the image, and an appropriate image size for the projection unit based on the viewing distance determined by the viewing distance determination unit. Or a control unit that performs control to project a suggestion image that suggests a type.

  According to another aspect of the present invention, there is provided a projection method in which a projector including a projection unit that projects an image onto a projection target is configured to output the projection target based on a focus adjustment value related to the projection unit or an imaging signal value obtained by imaging. And determining a viewing distance that is a distance from the image projected to the observation position of the image, and causing the projection unit to project a suggestion image that suggests an appropriate size or type of the image based on the viewing distance. Control is performed and the suggestion image is projected.

  According to the present invention, since the projector can project a suggestion image that suggests an appropriate image size or type suitable for the viewing distance, the projector can suggest an appropriate observation state to the observer of the image. .

  The projector includes a viewing distance determination unit that determines a viewing distance that is a distance from the projection target to the observation position of the image based on a focus adjustment value related to the projection unit or an imaging signal value obtained by imaging. A determination unit that determines whether a distance is suitable for the image size, and the control unit is configured to project the projection when the determination unit determines that the viewing distance is not suitable for the image size. Control may be performed to project an image suggesting the current observation position and an appropriate observation position as the suggestion image. According to this, the projector can suggest an appropriate observation state that is easier to understand for the observer of the image by suggesting the current observation position and the appropriate observation position.

  In addition to the focus adjustment value or the imaging signal value, the viewing distance determination unit is based on a relative position of a remote controller or a relative position of 3D glasses with respect to the projector, or a lens shift adjustment value related to the projection unit. The viewing distance may be determined. According to this, the projector can determine the viewing distance more accurately and suggest an appropriate observation position more accurately.

  The determination unit may determine whether the viewing distance is suitable for the image size based on an attribute value related to an age of an observer of the image. According to this, since the projector can suggest an observation position suitable for the age of the observer, it can suggest an appropriate observation position more accurately.

  The projection unit projects a 3D image as the image, and the control unit sets the appropriate observation position to a value obtained by multiplying a vertical length of the image projected on the projection target by three. You may perform control which projects the said suggestion image which suggests the position based on. According to this, the projector can suggest an observation position suitable for observation of 3D video.

It is a figure which shows the projection condition in a 1st Example. It is a functional block diagram of the projector in a 1st Example. FIG. 2 is a hardware block diagram of the projector in the first embodiment. It is a flowchart which shows the projection procedure in a 1st Example. It is a figure which shows an example of the suggestion image in a 1st Example. It is a functional block diagram of the projector in a 2nd Example. It is a flowchart which shows the projection procedure in a 2nd Example. It is a figure which shows an example of the suggestion image in a 2nd Example. It is a figure which shows an example of the suggestion image in another Example. It is a figure which shows another example of the suggestion image in another Example. It is a figure which shows another example of the suggestion image in another Example.

  Embodiments in which the present invention is applied to a projector will be described below with reference to the drawings. In addition, the Example shown below does not limit the content of the invention described in the claim at all. In addition, all of the configurations shown in the following embodiments are not necessarily essential as means for solving the problems described in the claims.

(First embodiment)
FIG. 1 is a diagram showing a projection situation in the first embodiment. The projector 100 has a function of projecting 3D video and 2D video on the screen (projection object) 10 as the image 20. The projector 100 may project a moving image or a still image as the image 20. Here, it is assumed that the projector 100 projects a 3D video (moving image) as the image 20.

  An adult observer 50 puts on 3D glasses 40, an elementary school observer 52 puts on 3D glasses 42, and operates the projector 100 by using a remote controller (remote controller) 30 to project the image 20 for observation. The persons 50 and 52 observe the image 20 projected on the screen 10.

  According to the “3DC Safety Guidelines” established by the 3D Consortium, when a 3D image is observed, the viewing distance L1 is 3 with respect to the vertical length (height) H1 of the image 20 projected on the screen 10. A position that is approximately double is defined as the optimum and safe observation position. The projector 100 has a function of projecting a suggestion image that suggests an optimal observation position when the viewing distance does not match the image size (H1). Next, functional blocks of the projector 100 having such functions will be described.

  FIG. 2 is a functional block diagram of the projector 100 according to the first embodiment. The projector 100 includes a signal input unit 110 to which an image signal or the like is input from an image supply device such as a DVD player (not shown), a storage unit 120, an image size determination unit 130 that determines an image size, and a viewing distance that determines a viewing distance. The distance determination unit 140, the control unit 150, the determination unit 160, a reception unit 170 that receives a signal from the remote controller 30, and a projection unit 190 are configured. The storage unit 120 stores image data 122 and the like. The projection unit 190 includes an image generation unit 191, a lens unit 192, a lens driving unit 194 that drives the lens unit 192, and a position detection unit 196 that detects the position of the lens unit 192. Note that the projector 100 may include an audio generation unit, an audio output unit, and the like.

  The projector 100 may function as each of these units using the following hardware. FIG. 3 is a hardware block diagram of the projector 100 according to the first embodiment. For example, the signal input unit 110 is an HDMI terminal 910, 911, a selector 912, a reception circuit 914, etc., and the storage unit 120 is a RAM 920, a flash ROM 922, etc., an image size determination unit 130, a viewing distance determination unit 140, a control unit 150, a determination The unit 160 is a CPU 930, the receiving unit 170 is a receiving unit 950, and the projection unit 190 is an image processing circuit 940, a lamp driving circuit 990, a lamp 991, an illumination optical system 992, a liquid crystal driving circuit 993, a liquid crystal light valve 994, and a lens. 995 etc. may be sufficient. Note that the lens 995 is actually composed of a plurality of lenses such as a zoom lens, a focus lens, and a projection lens.

  The lens driving unit 194 for performing focus adjustment and angle of view (zoom) adjustment includes a motor 972, a motor driving circuit 970 that drives the motor 972, a speed reduction mechanism 974 that adjusts the rotation speed of the motor 972, and rotation of the motor 972. The position detection unit 196 for the purpose may be a conversion mechanism 976 that converts the motion into a linear motion, and the position detection unit 196 for this purpose is connected to the speed reduction mechanism 974, and a lens 995 (focus lens or zoom lens) via the speed reduction mechanism 974. The encoder 978 or the like for acquiring the position information may be used. The lens driving unit 194 for performing the lens shift may be a motor driving circuit 980, a motor 982, a speed reduction mechanism 984, a conversion mechanism 986, and the like, and the position detection unit 196 for the purpose is the conversion mechanism 986. Or a linear sensor 988 that acquires position information of the lens 995 (projection lens) via the conversion mechanism 986.

  Next, a procedure for projecting the image 20 by the projector 100 will be described. FIG. 4 is a flowchart showing a projection procedure in the first embodiment. The observers 50 and 52 use the remote controller 30 to instruct to adjust the size of the image 20. The lens driving unit 194 drives the lens unit 192 in accordance with the instruction from the receiving unit 170. The position detection unit 196 transmits the zoom position of the lens unit 192 according to the driving to the image size determination unit 130 as a zoom value.

  In addition, the observers 50 and 52 use the remote controller 30 to instruct to adjust the focus of the image 20. The lens driving unit 194 drives the lens unit 192 in accordance with the instruction from the receiving unit 170. The position detection unit 196 transmits the focus position of the lens unit 192 according to the driving to the image size determination unit 130 and the viewing distance determination unit 140 as a focus value.

  The image size determination unit 130 determines the image size (H1) based on the focus value, the zoom value, and the image signal indicating the aspect ratio of the image 20 from the signal input unit 110, and the viewing distance determination unit 140 sets the focus value. Based on this, the viewing distance (L1) is determined (step S1). At this time, it is assumed that the viewers 50 and 52 are observing the image 20 at a position close to the projector 100. Note that the image size determination unit 130 may determine the image size (H1) according to the designation when the aspect ratio of the image 20 is designated by the viewers 50 and 52.

  The determination unit 160 determines whether the image size determined by the image size determination unit 130 is compatible with the viewing distance determined by the viewing distance determination unit 140 (step S2). For example, when H1 is 1.50 m in a situation where a 3D image is observed, 4.50 m is the optimum viewing distance. If 10% is allowed as an error, the determination unit 160 determines that the viewing distance (L1) is compatible with the image size if the viewing distance (L1) is 4.05 m to 4.95 m.

  When the viewing distance does not match the image size, the control unit 150 controls the projection unit 190 to project the suggestion image indicating the current position and the optimum observation position, and the projection unit 190 responds to the control. The suggestion image is projected (step S3). For example, in the above example, when the viewing distance is 3.5 m, the projection unit 190 suggests based on the information indicating the current viewing distance from the control unit 150 and the information indicating the optimum viewing distance and the image data 122. Project an image.

  FIG. 5 is a diagram illustrating an example of the suggestion image 300 in the first embodiment. The suggestion image 300 is an image indicating that the projector 100 is projecting the image 20 on the screen 10, an image indicating the current position of the viewers 50 and 52, an image indicating the optimum observation position, and “viewing 1 m below the projector” Please include an image showing the optimal observation position as a character string.

  When the viewing distance does not match the image size, or after a certain time (for example, 1 minute) has elapsed since the suggestion image 300 was projected, the projection unit 190 is input from the signal input unit 110 and controlled. Based on the image data 122 stored in the storage unit 120 by the unit 150, the image 20 is generated and projected onto the screen 10 (step S4).

  As described above, according to the present embodiment, the projector 100 can project the suggestion image 300 that suggests an observation position that is suitable for the image size of the 3D video, and thus is suitable for the viewers 50 and 52 of the image 20. Can suggest a state of observation. Further, according to the present embodiment, the projector 100 can suggest an appropriate observation state that is easier to understand for the observers 50 and 52 of the image 20 by suggesting the current observation position and the appropriate observation position. Accordingly, the projector 100 can cause the viewers 50 and 52 to observe the image 20 intended by the producer of the 3D video signal.

(Second embodiment)
When the viewing distance does not match the image size, in the first embodiment, the projector 100 projects the suggestion image 300 that suggests an appropriate observation position, but the projector suggests an appropriate image type. An image may be projected. In the first embodiment, the image size determination unit 130 and the viewing distance determination unit 140 determine the image size and the viewing distance based on the focus value and the like. However, the image size determination unit and the viewing distance determination unit The image size and viewing distance may be determined based on the values.

  FIG. 6 is a functional block diagram of the projector 101 in the second embodiment. The projector 101 has the same configuration as the projector 100, but includes an imaging unit 180. The control unit 151 stores the imaging signal value from the imaging unit 180 in the storage unit 121 as imaging data 124, and the viewing distance is the image size. The projection unit 190 is controlled to project a suggestion image that prompts a change from 3D video to 2D video, and the image size determination unit 131 and the viewing distance determination unit 141 use the imaging data 124. Different from the projector 100.

  In this embodiment, it is assumed that an image signal for 3D video is input to the signal input unit 110. In addition, the imaging unit 180 may be mounted on the projector 101 using, for example, a CMOS sensor. Next, a procedure for projecting the image 20 using these units will be described.

  FIG. 7 is a flowchart showing a projection procedure in the second embodiment. The imaging unit 180 captures an area including the image 20 projected on the screen 10. The control unit 151 stores the imaging signal value from the imaging unit 180 in the storage unit 121 as imaging data 124. The image size determination unit 131 determines the image size based on the imaging data 124, and the viewing distance determination unit 141 determines the viewing distance based on the imaging data 124 (step S11).

  For example, the image size determination unit 131 can determine that the image size has decreased if the size of the image 20 included in the captured image decreases due to the change in the zoom state. In addition, for example, the viewing distance determination unit 141 can determine that the viewing distance has increased if the size of the image 20 included in the captured image is reduced without changing the zoom state, and the viewer 50 can view the captured image. , 52 is included, it can be determined that the actual viewing distance is shorter than the viewing distance L1 (the distance between the projectors 100 and 101 and the image 20 projected on the screen 10).

  The determination unit 160 determines whether or not the image size determined by the image size determination unit 131 is compatible with the viewing distance determined by the viewing distance determination unit 141 (step S12). If the viewing distance matches the image size, the projection unit 190 projects a 3D video based on the image data 122 (step S13).

  On the other hand, when the viewing distance does not match the image size, the control unit 151 controls the projection unit 190, and the projection unit 190 changes the 3D video to the 2D video based on the image data 122 according to the control. A suggestion image prompting the change is generated and projected (step S14).

  FIG. 8 is a diagram illustrating an example of the suggestion image 301 in the second embodiment. The suggestion image 301 is an image showing a character string that prompts a change from 3D video to 2D video, such as “Current viewing position is not suitable for viewing 3D video. Do you want to change to 2D video?” “Yes” Image showing selectable options such as.

  Based on the information from the reception unit 170, the control unit 151 determines whether or not to change to the 2D video is selected in a state where the suggestion image 301 is projected (step S15). When changing to the 2D video is selected, the control unit 151 controls the projection unit 190 to project the 2D video, and the projection unit 190 controls the 2D video based on the image data 122 according to the control. Is projected (step S16). On the other hand, when the change to the 2D video is not selected, the projection unit 190 projects the 3D video based on the image data 122 (step S13). Note that a general method can be adopted as a method of changing from 3D video to 2D video.

  As described above, according to this embodiment as well, the projector 101 has the same operational effects as those of the first embodiment. Further, according to the present embodiment, the observers 50 and 52 do not have to move, so that the image 20 can be observed safely and comfortably even in a narrow room.

(Other examples)
In addition, application of this invention is not limited to the Example mentioned above, A deformation | transformation is possible. For example, you may combine the structure of the Example mentioned above. For example, the lens driving unit 194 may execute autofocus based on the imaging data 124, and the viewing distance determination units 140 and 141 may determine the viewing distance based on a focus value by autofocus.

  In addition, the suggestion images 300 and 301 are not limited to the images of the above-described embodiments. FIG. 9 is a diagram illustrating an example of the suggestion image 302 in another embodiment. For example, if the viewing distance does not match the image size, the control unit may display an appropriate image such as “Current image size is not suitable for viewing 3D video. Do you want to change to an appropriate image size?” The suggestion image 302 suggesting the size may be projected on the projection unit 190.

  In this case, when “Yes” is selected in a state where the suggestion image 302 is projected, the control units 150 and 151 control the projection unit 190 so that the image 20 is projected with a size corresponding to the viewing distance. May be. In this case, the image size determination units 130 and 131 are not necessary. In this case, the projectors 100 and 101 may change the image size by causing the user to perform a zoom operation or the like instead of automatically changing the image size.

  The determination by the determination unit 160 is not essential, and the projection unit 190 may project the suggestion image at a predetermined timing. FIG. 10 is a diagram illustrating another example of the suggestion image 303 in another embodiment. Moreover, FIG. 11 is a figure which shows another example of the suggestion image 304 in another Example. For example, the projection unit 190 may project the suggestion images 303 and 304 indicating appropriate observation positions such as “Please view this video from around ○ m”. The suggestion image 303 is an image in which an image showing the character string is overlaid on the original image, and the suggestion image 304 is an image showing the character string displayed together with an image showing attention on viewing. It is an image that has been.

  The predetermined timing is, for example, when the input of the 3D video signal is detected and the 3D display is enabled, when zoom adjustment, focus adjustment, or the like is performed, when the viewers 50 and 52 are in the 3D glasses 40, The time when the switch 42 is turned on, the time when a certain time (for example, 1 hour, 2 hours, etc.) has elapsed since the projection of the image 20 is started, and the time when the attention for viewing the 3D image is projected. Also good. In this case, the viewing distance determining units 140 and 141 are not necessary.

  For example, when the reception unit 170 is provided in front of and behind the projectors 100 and 101, the viewing distance determination units 140 and 141 correspond to the reception position of the signal from the remote control 30 (relative position of the remote control 30). A viewing distance L2 (see FIG. 1) that is the distance from the image 20 to the remote controller 30 may be determined. Similarly, the viewing distance determination units 140 and 141 correspond to the viewing distance L3 (see FIG. 1), which is the distance from the image 20 to the 3D glasses 42, according to the relative position of the 3D glasses (front, back, left, and right with respect to the projector 100). May be determined.

  Further, the viewing distance that is the distance from the image 20 to the viewers 50 and 52 may be determined according to the lens shift value related to the projection unit 190 (for example, if the lens is shifted to the left, the viewer 50, 52 is determined to be located on the left with respect to the projector 100, and if the lens is shifted to the right, the observers 50 and 52 are determined to be located on the right with respect to the projector 100).

  Specifically, for example, if the relative positions of the observers 50 and 52 are the left and right of the projector 100, the viewing distance determination units 140 and 141 determine the value obtained by adding 0.5 m to the viewing distance L1 as the viewing distance. If the relative positions of the viewers 50 and 52 are in front of the projector 100, a value obtained by subtracting 1 m from the viewing distance L1 is determined as the viewing distance, and if the relative positions of the viewers 50 and 52 are behind the projector 100, A value obtained by adding 1 m to the viewing distance L1 may be determined as the viewing distance.

  According to these, the projectors 100 and 101 can determine the viewing distance more accurately. Even when the reception unit 170 is provided at one location of the projectors 100 and 101, for example, the remote controller 30, the 3D glasses 40 and 42 emit infrared light having different light emission patterns in the front, rear, left, and right. Thus, the viewing distance determination units 140 and 141 can determine the relative position.

  Further, the determination unit 160 may determine whether the viewing distance is suitable for the image size based on the attribute values related to the age of the viewers 50 and 52. For example, since the observer 52 is an elementary school student, the width of the eyes is narrower than that of the observer 50, and the stereoscopic effect of the image 20 is larger than that of the observer 50. Specifically, for example, when the reception unit 170 receives a signal from the 3D glasses 42 for children, or when user data indicating that the age of the observer 52 is the child's age is stored, the determination is made. The unit 160 may transmit the image 20 to the control unit 152 so that the size of the image 20 is smaller than usual. Accordingly, the projectors 100 and 101 can project the images 20 and 21 having a size suitable for the age of the viewers 50 and 52.

  Further, the image size determination units 130 and 131 may determine the image size according to the image size input by the viewers 50 and 52, and the viewing distance determination units 140 and 141 are determined by the viewers 50 and 52. The viewing distance may be determined according to the input viewing distance. In the embodiment described above, the viewing distance is the distance from the center position of the image 20, but is not limited to the center position of the image 20, and is, for example, the center position of the optical axis of the projection light. Also good.

  Further, the determination unit 160 sets the allowable value when determining whether the viewing distance is compatible with the image size as 10% vertically, but the allowable value is not limited to 10% vertically. For example, the determination unit 160 may determine the number of observers 50 and 52 based on the number of 3D glasses 40 and 42 (for example, the number of types of identification signals included in infrared signals from the 3D glasses 40 and 42) and captured images. The allowable value may be increased as the number of people increases. Further, the viewing distance serving as a reference for the determination is not limited to three times the height of the image 20. For example, the viewing distance intended by the producer of the 3D video signal may be applied.

  Further, the value from which the image size is determined is not limited to the aspect ratio indicated by the image signal and the aspect ratio specified by the user. For example, when a part of the images 20 and 21 is a 2D caption when projecting a 3D video, the image size determination units 130 and 131 may determine the image size excluding the caption part.

  Further, the projectors 100 and 101 may adjust the size of the image 20 when projecting 2D video. For example, if the range in which the viewers 50 and 52 can recognize characters and the like in the horizontal direction is 100 degrees, the image size (here, the length in the horizontal direction) exceeds 100 degrees with respect to the observation position. In such a case, the control units 150 and 151 may reduce the size of the image by controlling the projection unit 190 so that the image size is 100 degrees or less.

  The computers included in the projectors 100 and 101 may function as the control units 150 and 151 by reading a program stored in the information storage medium. As such an information storage medium, for example, a CD-ROM, DVD-ROM, ROM, RAM, HDD, or the like can be applied.

  Note that the projection target is not limited to the screen 10 and may be, for example, a wall, a whiteboard, a blackboard, or the like. Further, the projectors 100 and 101 are not limited to liquid crystal projectors (transmission type, reflection type such as LCOS), and may be projectors using a digital micromirror device, for example. The projection unit 190 may employ a self-light emitting element including a solid light source such as an organic EL element, a silicon light emitting element, a laser diode, and an LED instead of the lamp. Further, the functions of the projectors 100 and 101 may be distributed to a plurality of devices (for example, a PC and a projector).

  10 screen (projection object), 20 images, 30 remote control, 40, 42 3D glasses, 50, 52 observer, 100, 101 projector, 110 signal input unit, 120, 121 storage unit, 122 image data, 124 imaging data, 130, 131 Image size determination unit, 140, 141 Viewing distance determination unit, 150, 151 control unit, 160 determination unit, 170 reception unit, 180 imaging unit, 190 projection unit, 191 image generation unit, 192 lens unit, 194 lens drive , 196 position detection unit, 300 to 304 suggestion image, 910, 911 HDMI terminal, 912 selector, 914 reception circuit, 920 RAM, 922 flash ROM, 930 CPU, 940 image processing circuit, 950 reception unit, 970, 980 Motor drive Circuit, 97 , 982 motor, 974,984 reduction mechanism, 976,986 conversion mechanism, 978 encoder, 988 linear sensor, 990 a lamp driving circuit, 991 lamp, 992 an illumination optical system, 993 a liquid crystal driving circuit, 994 a liquid crystal light valve, 995 lenses

Claims (8)

A projection unit that projects an image onto a projection target;
Based on a focus adjustment value and a zoom adjustment value related to the projection unit, an aspect ratio of the image, or an imaging signal value obtained by imaging the image projected on the projection target, the image projected on the projection target An image size determining unit for determining an image size related to the size;
Based on the image size determined by the image size determination unit, a control unit that controls the projection unit to project a suggestion image that suggests an appropriate observation position;
Including projector. The projector according to claim 1.
A viewing distance that is a distance from the projection object to an observation position when the observer observes the image at a position close to the projector is determined based on a focus adjustment value related to the projection unit or an imaging signal value obtained by imaging. A viewing distance determining unit,
A determination unit for determining whether the viewing distance is adapted to the image size;
Including
When the determination unit determines that the viewing distance does not match the image size, the control unit determines the current observation position and an appropriate observation position as the suggestion image to the projection unit. Control to project the suggested image,
projector. The projector according to claim 2,
The viewing distance determination unit, in addition to the focus adjustment value or the imaging signal value, based on the lens shift adjustment values for the previous SL projection unit, to determine the viewing distance,
projector. The projector according to claim 2 or 3,
The determination unit determines whether the viewing distance is suitable for the image size based on an attribute value related to an age of an observer of the image.
projector. In the projector of any one of Claims 1-4,
The projection unit projects a 3D image as the image,
The control unit performs control to project the suggestion image suggesting a position based on a value obtained by multiplying a vertical length of an image projected on the projection target by three times as the appropriate observation position.
projector. A projector,
A projection unit that projects an image onto a projection target;
The focus adjustment value relates to a projection portion, or on the basis of the image signal values of the imaging of the projection has been the image on the projection target, the image projected on the projection target, the at observer close to the projector position A viewing distance determination unit that determines a viewing distance that is a distance to an observation position when observing an image;
Based on the viewing distance determined by the viewing distance determining unit, a control unit that controls the projecting unit to project a suggestion image that suggests an appropriate image size or type;
Including projector. A projector including a projection unit that projects an image onto a projection target
Based on a focus adjustment value and a zoom adjustment value related to the projection unit, an aspect ratio of the image, or an imaging signal value obtained by imaging the image projected on the projection target, the image projected on the projection target Determine the image size with respect to size,
Based on the image size, the projection unit is controlled to project a suggestion image that suggests an appropriate observation position,
Projecting the suggestion image,
Projection method. A projector including a projection unit that projects an image onto a projection target
The focus adjustment value relates to a projection portion, or on the basis of the image signal values of the imaging of the projection has been the image on the projection target, the image projected on the projection target, the at observer close to the projector position Determine the viewing distance, which is the distance to the observation position when observing the image,
Based on the viewing distance, the projection unit is controlled to project a suggestion image that suggests an appropriate image size or type,
Projecting the suggestion image,
Projection method.