JP2012220515A - Projection device and control method of projecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method for a projection device and a projection device capable of reducing the possibility of causing viewers to feel glare or difficulty in viewing when projecting an image on a desk surface. The purpose is to provide.
In a state of projecting onto a desk surface or the like, by darkening the projected image, the possibility of causing the viewer to feel, for example, glare or difficulty in viewing is reduced.
[Selection] Figure 3

Description

  The present invention relates to a projection apparatus and a control method for the projection apparatus.

  Conventionally, liquid crystal projectors, DLP projectors, laser projectors, and the like are known as projection devices. In recent years, projectors capable of projecting not only on wall surfaces but also on desk surfaces and ceilings have appeared in such projection apparatuses (for example, Patent Document 1).

JP 2003-280091 A

  However, the projection apparatus as shown in Patent Document 1 does not change the projection processing of the projector according to the projection direction. Therefore, for example, when an image projected on a wall surface about 3 m away from the viewer is projected on the desk surface (1 m or less from the viewer) as it is, the distance from the viewer to the projection plane becomes short, so viewing For example, there is a problem that the person feels glare or feels difficult to see.

  Therefore, the present invention provides a projection device that can reduce the possibility of causing viewers to feel, for example, glare or difficulty in viewing when projecting an image on a desk surface in this way, It is an object of the present invention to provide a method for controlling a projection device.

In order to achieve such an object, the projection device of the present invention is a projection device that projects an image, an acquisition unit that acquires an image, and a projection unit that projects the image acquired by the acquisition unit,
When it is determined by the determination unit that determines the projection posture of the projection device and the determination unit is projected downward in the direction of gravity, than when it is determined that the projection is projected in the other direction, It has a control means for controlling the projection means so that the projection image becomes dark.

  The present invention can reduce the possibility of causing the viewer to feel, for example, glare or difficulty in viewing by darkening the projected image in a state of projecting onto a desk surface or the like. .

1 is a diagram illustrating an overall configuration of a liquid crystal projector 100. FIG. It is a flowchart for demonstrating control of the basic operation | movement of the liquid crystal projector 100 of a present Example. It is a flowchart for demonstrating the projection process of a present Example.

  Hereinafter, examples of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments.

  In this embodiment, a liquid crystal projector will be described as an example of a projection apparatus. However, the present invention is not limited to a liquid crystal projector, and can be applied to any projection device such as a DLP projector or a laser projector. In addition, a single-plate type and a three-plate type are generally known as the liquid crystal projector, but either type may be used.

  The liquid crystal projector of this embodiment presents an image to the user by controlling the light transmittance of the liquid crystal element according to the image to be displayed and projecting the light from the light source that has passed through the liquid crystal element onto the screen. To do.

  Hereinafter, such a liquid crystal projector will be described.

  In this embodiment, “light flux (lumen)” is used for the light intensity, but it is read as “luminance (candela), light quantity (lumens / second), illuminance (lux), luminance (candela / square meter)”. Also good.

<Overall configuration>
First, the overall configuration of the liquid crystal projector of this embodiment will be described with reference to FIG.

  FIG. 1 is a diagram illustrating an overall configuration of a liquid crystal projector 100 according to the present embodiment.

  The liquid crystal projector 100 according to the present embodiment includes a control unit 110, an operation unit 111, a bus 112, an image input unit 130, and an image processing unit 140. The liquid crystal projector 100 further includes a liquid crystal control unit 150, liquid crystal elements 151R, 151G, and 151B, a light source control unit 160, a light source 161, a color separation unit 162, a color composition unit 163, an optical system control unit 170, and a projection optical system 171. Have The liquid crystal projector 100 may further include a recording / playback unit 191, a recording medium 192, a communication unit 193, an imaging unit 194, a display control unit 195, and a display unit 196.

  The control unit 110 controls each operation block of the liquid crystal projector 100 and includes, for example, a CPU, a memory, or a microprocessor. In addition, still image data and moving image data reproduced from the recording medium 192 by the recording / reproducing unit 191 and still image data and moving image data received from the communication unit 193 can be reproduced. In addition, an image or video obtained by the imaging unit 194 can be converted into still image data or moving image data and recorded on the recording medium 192. The operation unit 111 receives a user instruction and transmits an instruction signal to the control unit 110. The operation unit 111 includes, for example, a switch, a dial, a touch panel provided on the display unit 196, and the like. The operation unit 111 may be, for example, a signal reception unit (such as an infrared reception unit) that receives a signal from a remote controller, and transmits a predetermined instruction signal to the control unit 110 based on the received signal. . The control unit 110 receives control signals input from the operation unit 111 and the communication unit 193 and controls each operation block of the liquid crystal projector 100.

  The image input unit 130 receives a video signal from an external device, and includes, for example, a composite terminal, an S video terminal, a D terminal, a component terminal, an analog RGB terminal, a DVI-I terminal, a DVI-D terminal, and HDMI (registered). Trademark) terminal. When an analog video signal is received, the received analog video signal is converted into a digital video signal. Then, the received video signal is transmitted to the image processing unit 140. Here, the external device may be any device such as a personal computer, a camera, a mobile phone, a smartphone, a hard disk recorder, or a game machine as long as it can output a video signal.

  The image processing unit 140 performs processing for changing the number of frames, the number of pixels, the image shape, and the like on the video signal received from the video input unit 130, and transmits the video signal to the liquid crystal control unit 150. For example, a microprocessor for image processing Consists of. Further, the image processing unit 140 does not have to be a dedicated microprocessor, and may be, for example, a part of the processing function of the CPU and memory or the microprocessor that operates the control unit 110. The image processing unit 140 can execute functions such as frame thinning processing, frame interpolation processing, resolution conversion processing, and distortion correction processing (keystone correction processing). In addition to the video signal received from the video input unit 130, the image processing unit 140 can perform the above-described change processing on the image or video reproduced by the control unit 110.

  The liquid crystal control unit 150 controls the voltage applied to the liquid crystal of the pixels of the liquid crystal elements 151R, 151G, and 151B based on the video signal processed by the image processing unit 140, and the liquid crystal elements 151R, 151G, and 151B. It adjusts the transmittance and consists of a control microprocessor. Further, the liquid crystal control unit 150 does not need to be a dedicated microprocessor, and may be, for example, a part of the processing function of the CPU and memory or the microprocessor that performs the operation of the control unit 110. For example, when a video signal is input to the image processing unit 140, the liquid crystal control unit 150 causes the liquid crystal element to have a transmittance corresponding to the image every time an image of one frame is received from the image processing unit 140. 151R, 151G, and 151B are controlled. The liquid crystal element 151 </ b> R is a liquid crystal element corresponding to red, and out of the light output from the light source 161, the light separated into red (R), green (G), and blue (B) by the color separation unit 162. Among them, the red light transmittance is adjusted. The liquid crystal element 151 </ b> G is a liquid crystal element corresponding to green, and out of the light output from the light source 161, the light separated into red (R), green (G), and blue (B) by the color separation unit 162. Among them, it is for adjusting the transmittance of green light. The liquid crystal element 151 </ b> B is a liquid crystal element corresponding to blue, and of the light output from the light source 161, the light separated into red (R), green (G), and blue (B) by the color separation unit 162. Among them, it is for adjusting the transmittance of blue light.

  The light source control unit 160 controls on / off of the light source 161 and controls the amount of light, and includes a control microprocessor. Further, the light source control unit 160 does not need to be a dedicated microprocessor, and may be, for example, a part of the processing function of the CPU and memory or the microprocessor that performs the operation of the control unit 110. The light source 161 outputs light for projecting an image on a screen (not shown), and may be, for example, a halogen lamp, a xenon lamp, a high-pressure mercury lamp, or the like. The color separation unit 162 separates light output from the light source 161 into red (R), green (G), and blue (B), and includes, for example, a dichroic mirror or a prism. In addition, when using LED etc. corresponding to each color as the light source 161, the color separation part 162 is unnecessary. The color synthesis unit 163 synthesizes red (R), green (G), and blue (B) light transmitted through the liquid crystal elements 151R, 151G, and 151B, and includes, for example, a dichroic mirror or a prism. . Then, light obtained by combining the red (R), green (G), and blue (B) components by the color combining unit 163 is sent to the projection optical system 171. At this time, the liquid crystal elements 151 </ b> R, 151 </ b> G, and 151 </ b> B are controlled by the liquid crystal control unit 150 so as to have a light transmittance corresponding to the image input from the image processing unit 140. Therefore, when the light combined by the color combining unit 163 is projected onto the screen by the projection optical system 171, an image corresponding to the image input by the image processing unit 140 is displayed on the screen.

  The optical system control unit 170 controls the projection optical system 171 and includes a control microprocessor. Further, the optical system control unit 170 does not have to be a dedicated microprocessor, and may be, for example, a part of the processing function of the CPU and memory or the microprocessor that operates the control unit 110. The projection optical system 171 is for projecting the combined light output from the color combining unit 163 onto the screen, and includes a plurality of lenses and lens driving actuators. By driving the lenses by the actuators, The projected image can be enlarged, reduced, or focused.

  The recording / reproducing unit 191 reproduces still image data and moving image data from the recording medium 192, and receives image and video still image data and moving image data obtained by the imaging unit 194 from the control unit 110 to record the recording medium. Or 192. Still image data and moving image data received from the communication unit 193 may be recorded on the recording medium 192. The recording / reproducing unit 191 includes, for example, an interface electrically connected to the recording medium 192 and a microprocessor for communicating with the recording medium 192. The recording / playback unit 191 does not need to include a dedicated microprocessor. For example, a communication function with the recording medium 192 is realized by a CPU that operates the control unit 110 and a part of processing functions of the memory or the microprocessor. You may do it. The recording medium 192 can record still image data, moving image data, and other control data necessary for the liquid crystal projector of this embodiment, and can be used for any kind of magnetic disk, optical disk, semiconductor memory, etc. It may be a recording medium of a system, and may be a removable recording medium or a built-in recording medium.

  The communication unit 193 is for receiving control signals, still image data, moving image data, and the like from an external device. For example, the communication unit 193 may be a wireless LAN, a wired LAN, USB, Bluetooth (registered trademark), or the like. The method is not particularly limited. Further, if the terminal of the image input unit 130 is, for example, an HDMI (registered trademark) terminal, CEC communication may be performed via the terminal. Here, the external device may be any device such as a personal computer, a camera, a mobile phone, a smartphone, a hard disk recorder, a game machine, or a remote controller as long as it can communicate with the liquid crystal projector 100. .

  The imaging unit 194 captures an image of the periphery of the liquid crystal projector 100 of the present embodiment and acquires an image signal, and can capture an image projected through the projection optical system 171 (capture the screen direction). . The imaging unit 194 transmits the obtained image or video to the control unit 110, and the control unit 110 converts the image or video into still image data or moving image data. The imaging unit 194 is obtained by a lens that acquires an optical image of a subject, an actuator that drives the lens, a microprocessor that controls the actuator, an imaging element that converts the optical image acquired via the lens into an image signal, and the imaging element. It comprises an AD conversion unit that converts an image signal into a digital signal. In addition, the imaging unit 194 is not limited to the one that captures the screen direction, and may capture the viewer side in the opposite direction to the screen, for example.

  The display control unit 195 controls the display unit 196 provided in the liquid crystal projector 100 to display an image such as an operation screen or a switch icon for operating the liquid crystal projector 100, and is a micro that performs display control. It consists of a processor. Further, it is not necessary to be a microprocessor dedicated to the display control unit 195. For example, it may be a part of the processing function of the CPU and memory or the microprocessor that performs the operation of the control unit 110. The display unit 196 displays an operation screen and switch icons for operating the liquid crystal projector 100. The display unit 196 may be anything as long as it can display an image. For example, it may be a liquid crystal display, a CRT display, an organic EL display, or an LED display. Further, in order to post a specific button so that the user can recognize it, an LED or the like corresponding to each button may be made to emit light.

  Note that the image processing unit 140, the liquid crystal control unit 150, the light source control unit 160, the optical system control unit 170, the recording / playback unit 191 and the display control unit 195 of the present embodiment perform the same processing as those of these blocks. There may be one or more possible microprocessors. Alternatively, similar processing may be performed by the CPU of the control unit 110 and a memory or a microprocessor.

<Basic operation>
Next, the basic operation of the liquid crystal projector 100 of this embodiment will be described with reference to FIGS.

  FIG. 2 is a flowchart for explaining the control of the basic operation of the liquid crystal projector 100 of the present embodiment. The operation in FIG. 2 is basically executed by the control unit 110 controlling each functional block. The flowchart in FIG. 2 starts when the user instructs the liquid crystal projector 100 to be turned on by the operation unit 111 or a remote controller (not shown).

  When the user instructs the liquid crystal projector 100 to be turned on using the operation unit 111 or a remote controller (not shown), the control unit 110 supplies power from a power supply circuit (not shown) to each part of the projector 100 from the power supply unit (not shown). .

  Next, the control unit 110 determines the display mode selected by the operation of the operation unit 111 or the remote controller by the user (S210). One of the display modes of the projector 100 according to the present embodiment is an “input image display mode” in which a video input from the image input unit 130 is displayed. In addition, one of the display modes of the projector 100 according to the present embodiment is a “file playback display mode” for displaying still image data or moving image data or video read from the recording medium 192 by the recording / playback unit 191. . In addition, one of the display modes of the projector 100 according to the present embodiment is a “file reception display mode” in which an image or video of still image data or moving image data received from the communication unit 193 is displayed. In the present embodiment, the case where the display mode is selected by the user will be described. However, the display mode at the time of turning on the power may be the display mode at the end of the previous time. These display modes may be set as the default display mode. In that case, the process of S210 can be omitted.

  Here, it is assumed that “input image display mode” is selected in S210.

  When “input image display mode” is selected, the control unit 110 determines whether or not a video is input from the image input unit 130 (S220). If it is not input (No in S220), the control unit waits until an input is detected. If it is input (Yes in S220), the control unit executes a projection process (S230).

  As the projection processing, the control unit 110 transmits the video input from the image input unit 130 to the image processing unit 140, and causes the image processing unit 140 to perform the transformation of the number of pixels, the frame rate, and the shape of the video, The applied image for one screen is transmitted to the liquid crystal control unit 150. Then, the control unit 110 causes the liquid crystal control unit 150 to have a transmittance corresponding to the gradation level of each color component of red (R), green (G), and blue (B) of the received image for one screen. The transmittance of the liquid crystal panels 151R, 151G, and 151B is controlled. Then, the control unit 110 causes the light source control unit 160 to control the output of light from the light source 161. The color separation unit 162 separates the light output from the light source 161 into red (R), green (G), and blue (B), and supplies each light to the liquid crystal panels 151R, 151G, and 151B. The amount of light of each color supplied to the liquid crystal panels 151R, 151G, and 151B is limited for each pixel of each liquid crystal panel. Then, the red (R), green (G), and blue (B) lights transmitted through the liquid crystal panels 151R, 151G, and 151B are supplied to the color synthesis unit 163 and synthesized again. The light combined by the color combining unit 163 is projected onto a screen (not shown) via the projection optical system 171.

  This projection processing is sequentially executed for each image of one frame while the image is projected.

  At this time, when an instruction to operate the projection optical system 171 is input from the instruction unit 111 by the user, the control unit 110 changes the focus of the projection image to the optical system control unit 170 or sets the optical system. The actuator of the projection optical system 171 is controlled so as to change the enlargement ratio.

  During the execution of the display process, the control unit 110 determines whether an instruction to switch the display mode is input from the instruction unit 111 (S240). Here, when an instruction to switch the display mode is input from the instruction unit 111 by the user (Yes in S240), the control unit 110 returns to S210 again and determines the display mode. At this time, the control unit 110 transmits a menu screen for selecting a display mode to the image processing unit 140 as an OSD image, and the image processing unit 140 so as to superimpose the OSD screen on the image being projected. To control. The user selects a display mode while viewing the projected OSD screen.

  On the other hand, when an instruction to switch the display mode is not input from the instruction unit 111 by the user during display processing (No in S240), the control unit 110 determines whether an instruction to end projection is input from the instruction unit 111 by the user. Is determined (S250). Here, when an instruction to end projection is input from the instruction unit 111 by the user (Yes in S250), the control unit 110 stops power supply to each block of the projector 100 and ends image projection. On the other hand, when an instruction to end projection is input from the instruction unit 111 by the user (No in S250), the control unit 110 returns to S220, and thereafter, an instruction to end projection is input from the instruction unit 111 by the user. The processes from S220 to S250 are repeated until

  As described above, the liquid crystal projector 100 of this embodiment projects an image on the screen.

  In the “file playback display mode”, the control unit 110 causes the recording / playback unit 191 to read out a file list of still image data and moving image data and thumbnail data of each file from the recording medium 192. Then, the control unit 110 generates a character image based on the read file list and an image based on the thumbnail data of each file, and transmits the image to the image processing unit 140. Then, the control unit 110 controls the image processing unit 140, the liquid crystal control unit 150, and the projection control unit 160 in the same manner as the normal projection processing (S230).

  Next, on the projection screen, an instruction to select characters and images respectively corresponding to still image data and moving image data recorded on the recording medium 192 is input through the instruction unit 111. Then, the control unit 110 controls the recording / reproducing unit 191 so as to read out the selected still image data or moving image data from the recording medium 192, and the control unit 110 reads the image of the read still image data or moving image data, Play the video.

  Then, for example, the control unit 110 sequentially transmits the video of the reproduced moving image data to the image processing unit 140, and the image processing unit 140, the liquid crystal control unit 150, and the projection control unit 160 in the same manner as the normal projection processing (S 230). To control. When the still image data is reproduced, the reproduced image is transmitted to the image processing unit 140, and the image processing unit 140, the liquid crystal control unit 150, and the projection control unit 160 are transmitted in the same manner as the normal projection processing (S230). Control.

  Further, in the “file reception display mode”, the control unit 110 reproduces still image data and moving image data and video received from the communication unit 193. Then, for example, the control unit 110 sequentially transmits the video of the reproduced moving image data to the image processing unit 140, and the image processing unit 140, the liquid crystal control unit 150, and the projection control unit 160 in the same manner as the normal projection processing (S 230). To control. When the still image data is reproduced, the reproduced image is transmitted to the image processing unit 140, and the image processing unit 140, the liquid crystal control unit 150, and the projection control unit 160 are transmitted in the same manner as the normal projection processing (S230). Control.

<Projection processing operation>
Next, the projection process (S230) of the liquid crystal projector 100 of the present embodiment will be described with reference to FIG. FIG. 3 is basically executed by the control unit 110 by controlling each functional block.

  First, when the projection process (S230) is entered, the control unit 110 acquires the output of an orientation sensor (not shown) (gravity sensor, acceleration sensor, etc.) and detects the orientation of the liquid crystal projector 100. Then, it is determined from the detected posture whether the projection posture is a “wall surface projection” posture or a “desk surface projection” posture (S310). In this determination, for example, it is determined as “desk projection” from a downward direction in the direction of gravity to a predetermined angle (for example, 0 to 40 degrees), and the other is determined as “wall projection”.

  In this embodiment, the projection posture is determined based on the posture detected by the posture sensor. For example, a “wall surface projection” button and a “desk surface projection” button are provided on the operation unit 111 of the liquid crystal projector 100. Depending on the result selected by the user, the projection posture may be determined, or a graphical user interface may be displayed on the projection screen to select either “wall surface projection” or “desk surface projection”. good. In this case, the selection screen displays a graphical user interface on the projection screen after detecting the input image (S220).

  Here, the case of “wall surface projection” (wall surface projection in S310) will be described.

  In the case of “wall projection”, the control unit 110 instructs the light source control unit 160 to control the output light flux of the light source 161 to 3000 lumens. The light source controller 160 controls the output light flux of the light source 161 to be 3000 lumens by adjusting the supply voltage to the light source (S321).

  Next, the control unit 110 controls the image processing unit 140 so as not to change the luminance of each color component of the image processed by the image processing unit 140 (S322). For example, when the luminance of the image is 70%, the image processing unit 140 processes the image so that the luminance of each color component is 0.7 times. However, in the case of “wall projection”, the luminance is not particularly lowered.

  Next, the control unit 110 controls the liquid crystal control unit 150 so as to normally control the liquid crystal transmittance (S323). As described above, the liquid crystal control unit 150 controls the transmittance of the liquid crystal element 151 based on the image transmitted from the image processing unit 140. For example, when an instruction to reduce the transmittance by 10% is output from the control unit 110, the transmittance of the liquid crystal element 151 is set to a transmittance that is 10% lower than the transmittance based on the image transmitted from the image processing unit 140. To do. However, in the case of “wall projection”, the transmittance is not particularly lowered.

  Next, the control unit 110 controls the optical system control unit 170 so that the focal length is 4 m (S324). The optical system control unit 170 controls the focal length to be 4 m by moving the lens of the projection optical system 171 with a motor or the like.

  On the other hand, the case of “desk projection” (desk projection in S310) will be described.

  In the case of “desk surface projection”, the control unit 110 instructs the light source control unit 160 to control the output light beam of the light source 161 to 1000 lumens. The light source control unit 160 controls the output light flux of the light source 161 to be 1000 lumens by adjusting the supply voltage to the light source (S331).

  Next, the control unit 110 controls the image processing unit 140 so that the luminance of each color component of the image processed by the image processing unit 140 is 40% (S322). The image processing unit 140 processes the image so as to reduce the luminance of each color component of the image by 0.4 times.

  Next, the control unit 110 controls the liquid crystal control unit 150 so as to control the transmittance of the liquid crystal element 151 to be reduced by 60% (S323). The liquid crystal control unit 150 sets the transmittance of the liquid crystal element 151 to 60% lower than the transmittance based on the image transmitted from the image processing unit 140.

  Next, the control unit 110 controls the optical system control unit 170 so that the focal length is 2 m (S324). The optical system control unit 170 controls the focal length to be 2 m by moving the lens of the projection optical system 171 with a motor or the like.

  Thus, in the present embodiment, in the case of “desk projection”, the projection image projected on the desk can be darkened by the processing from S331 to S334. In particular, the projected image can be made darker than in the case of “wall projection”.

  In the present embodiment, in the case of “desk surface projection”, all the processes from S331 to S334 have been described. However, any one of S331 to S334 may be performed. In addition, other processing may be executed.

  Each numerical value in S331 to S333 may be changed according to the distance from the projector to the desk surface. There are the following methods for measuring the distance. For example, the control unit 110 controls the optical system control unit 170 so as to adjust the position of the lens so that the contrast of the boundary between the projection plane and the projection image becomes high while evaluating the image obtained by the imaging unit 194. To do. Then, the distance to the projection surface is obtained based on the position of the lens with high contrast.

  For example, when the distance to the wall surface and the distance to the desk surface are the same, for example, 2500 lumens are set in S331 so that the projected image by the desk surface projection becomes darker, and the luminance level in S332 90% may be set, and a decrease in liquid crystal transmittance of 10% may be selected in S333.

  In addition, “wall projection” in this embodiment may be read as “lateral projection”, and “desk projection” may be read as “down projection”.

  As described above, when projecting downward in the direction of gravity, the projection apparatus according to the present embodiment makes the projected image projected on the projection surface dark, for example, to make it feel dazzling or difficult to see. The possibility of making it feel can be reduced.

In this embodiment, an example of controlling the light amount of the projection surface in the liquid crystal projector has been described. However, for example, in the case of a DLP projector, the light amount can be controlled by the following method.
A) Light source control: As in S331 of this embodiment, in the case of projection downward in the gravitational direction, the light source is darkened by lowering the supply voltage to the light source as compared with the case of projecting laterally with respect to the gravitational direction. To darken.
B) DMD panel control: For each color of the DMD panel, the projection image projected on the projection plane is darkened by shortening the time for reflection on the projection plane.

Claims (9)

A projection device for projecting an image,
An acquisition means for acquiring an image;
Projection means for projecting an image acquired by the acquisition means;
Determination means for determining a projection posture of the projection device;
When it is determined by the determination means that the projection is projected downward in the gravity direction, the projection means is controlled so that the projected image becomes darker than when it is determined that the projection is performed in the other direction. A projection apparatus comprising control means. A projection device for projecting an image,
An acquisition means for acquiring an image;
Projection means for projecting an image acquired by the acquisition means;
Control means for controlling the projection means,
The projection unit controls the projection unit so that the projected image becomes darker when projected downward in the direction of gravity than when projected in the other direction. . A projection device for projecting an image,
An acquisition means for acquiring an image;
Projecting means for projecting the image obtained by the obtaining means;
Control means for controlling the projection means,
The projection device controls the projection unit so that the projection image becomes darker in the case of desk projection than in the case of wall projection. A projection device for projecting an image,
An acquisition means for acquiring an image;
Projection means for projecting an image acquired by the acquisition means;
Determination means for determining a projection posture of the projection device;
A projection apparatus comprising: a control unit that controls the projection unit so that the projection image becomes darker when the determination unit determines that the projection is a desk surface projection than when it is determined that the projection is a wall surface projection.   The projection apparatus according to claim 1, wherein the control unit darkens the projection image by reducing an output light beam of a light source of the projection unit.   The projection apparatus according to claim 1, wherein the control unit darkens the projection image by processing the acquired image. The projection means projects an image by controlling the transmittance of the liquid crystal element,
The projection apparatus according to claim 1, wherein the control unit darkens the projection image by lowering a transmittance of the liquid crystal element. An acquisition means for acquiring an image;
A projecting unit for projecting an image acquired by the acquiring unit,
A method for controlling a projection apparatus, comprising: controlling the projection unit so that a projected image becomes darker when projected downward in the direction of gravity than when projected in other directions. An acquisition means for acquiring an image;
A projecting unit for projecting an image acquired by the acquiring unit,
In the case of desk projection, the projection unit is controlled such that the projection image becomes darker than in the case of wall projection.

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