Projection apparatus, projection control method, and program

Abstract

To provide a projection apparatus, a projection control method, and a program for easily and reliably switching a plurality of displays so as to be selectable.SOLUTION: A projection apparatus includes a control unit, and an emission driving unit which selects as to whether to emit light in projection directions of pixels, according to image data related to the content of projection. The control unit is configured to cause the emission driving unit to project a first partial region including one of small images as contents of projection, out of multiple partial regions, so as to be selected from image data related to one image including the multiple partial regions with different small images allocated thereto.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] There are projection devices that project light onto a projection surface to display images, etc. Projection devices can display images not only on a screen, but also on walls, floors, roads, and various other objects. Image data produced using video content and presentation software is widely used as a projection target. Projection devices can also be used to automatically output advertising images and notification images to passersby and users of facilities for the purpose of advertising, publicity, and other purposes.

[0003] In addition, there are applications where a display screen showing various data held by a PC and involving a user is displayed as is for discussions and meetings. In the case of such informal display, unnecessary information may appear on the screen in the process of reading data from a folder or opening working data. In order to avoid such unnecessary images from being projected, there is a technology that cuts out only a part of the display screen and sets it as the projection target (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-266816 A Summary of the Invention [Problem to be solved by the invention]

[0005] When a projection device automatically displays a warning or alert message in response to information detected by the device, such as passersby, it takes time and effort for the projection device itself to switch the image data to be projected. Also, connecting to an external control device for control increases the cost and effort required to deal with the risk of network line disconnection. Therefore, there is a problem in that it is difficult to selectively switch between multiple displays easily and reliably.

[0006] An object of the present invention is to provide a projection device, a projection control method, and a program that can selectively switch between a plurality of displays easily and reliably. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides A control unit; an emission driver that switches whether or not light is emitted in the projection direction of each pixel in accordance with image data relating to the projection content; Equipped with The control unit is Operate the emission driving unit so as to selectively project a first partial area including one of the plurality of partial areas as the projection content, from image data relating to one image including a plurality of partial areas to which different small images are respectively assigned, among the plurality of partial areas. It is a projection device. Effect of the Invention

[0008] According to the present invention, there is an advantage that a projection device can easily and reliably selectively switch between a plurality of displays. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram illustrating an example of installation of a projection device. [Diagram 2] 1 is a block diagram showing a functional configuration of a projection device according to an embodiment of the present invention. [Diagram 3] FIG. 4 is a diagram showing an example of an image included in the built-in image data. [Figure 4] FIG. 1 is a diagram illustrating image projection. [Diagram 5] 10 is a flowchart showing a control procedure of a projection control process. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating an example of installation of a projection device 1. As shown in FIG.

[0011] The projection device 1 of the present embodiment projects a caution display I at an intersection P between a specific work vehicle, such as a forklift, traveling along a specific route in a work site and the route of a worker H. Alternatively, the projection device 1 can be used for various other purposes of displaying information and warnings.

[0012] The projection device 1 is connected to and communicates with a photographing device 9 installed nearby, and is capable of acquiring images photographed by the photographing device 9. The photographing device 9 may capture visible light images or infrared images. Moreover, the photographed images may be still images obtained at certain photographing intervals. The photographing device 9 photographs the periphery of the projection surface of the warning display I by the projection device 1. The projection surface itself does not have to be included in the photographing range.

[0013] The captured image only needs to be capable of detecting the work vehicle and worker H, and does not necessarily have the sensitivity or resolution required for a person to visually recognize the contents. Furthermore, the captured image referred to here does not have to be captured as a continuous array of two-dimensional pixels. For example, the captured image may be detection point cloud data of a sensor for detecting the work vehicle and worker at one point or multiple discrete points.

[0014] The projection device 1 can receive the captured image from the photographing device 9 and obtain the surrounding situation of the projection surface. The photographing interval may be set such that the warning display I can be detected before the worker H arrives at the intersection P so that the warning display I can be effectively displayed for the worker H.

[0015] FIG. 2 is a block diagram showing the functional configuration of the projection device 1 of the present embodiment. The projection device 1 includes a CPU 11 (Central Processing Unit) (control unit), a RAM 12 (Random Access Memory), a memory unit 13, a communication unit 14, an operation reception unit 151, an operation reception unit 152, a projection unit 16, an emission driving unit 17, a cooling unit 18, and the like.

[0016] The CPU 11 is a processor that performs calculation processing to centrally control the overall operation of the projection device 1. The CPU 11 may have a single processor, or may have multiple processors that perform calculation processing in parallel or independently depending on the application.

[0017] The RAM 12 provides a working memory space for the CPU 11 and stores temporary data. The RAM 12 is not particularly limited, but may be, for example, a DRAM.

[0018] The storage unit 13 has a non-volatile memory such as a flash memory and / or a ROM (Read Only Memory), etc. The storage unit 13 stores a program 131 related to projection control, condition settings 132, built-in image data 133, and other setting data, etc. The stored contents will be described later.

[0019] The communication unit 14 controls data communication with the outside in accordance with a communication protocol. The communication unit 14 may include a wired video input terminal 141 and a communication interface 142. The video input terminal 141 is a USB (Universal Serial Bus) terminal, an HDMI (High Definition Multimedia Interface; registered trademark) terminal, or the like. These video input terminals 141 are terminals for inputting image data of a projection target. The video input terminal 141 may be capable of receiving data including audio data, such as HDMI. The communication interface 142 communicates with an external device via a network. The communication may be performed by a LAN (Local Area Network) or a wireless LAN. In this embodiment, the imaging device 9 is connected to the communication interface 142. Also, for example, as described later, when the main purpose is independent image projection, the projection device 1 may not have the video input terminal 141. Alternatively, the projection device 1 may have only a USB terminal or only a connection terminal for another portable recording medium, for example, for updating the built-in image data 133.

[0020] The operation reception unit 151 receives an operation from an external device such as a user, and outputs the content of the operation as an operation signal to the CPU 11. The operation reception unit 151 includes, for example, a push button switch, a slide switch, a rocker switch, a toggle switch, a rotary switch, or a combination of these. The operation receiving unit 152 receives radio waves from a remote controller operated by a user, and outputs the contents of the operation corresponding to the received radio waves as an operation signal to the CPU 11. The operation receiving unit 152 may be capable of receiving, for example, radio waves for infrared communication, and demodulates the operation signal from the received radio waves. The configuration related to the reception of these operations may be used, for example, for adjusting the projection, etc. Examples of the adjustment contents include zooming, light amount adjustment, and keystone distortion correction.

[0021] The projection unit 16 has a light emitting unit 161, an optical system 162, a rotation drive unit 163, and a rotation motor 164. The light emitting unit 161 includes, for example, a light source 1611 and a fluorescent wheel 1612. The rotation drive unit 163 outputs a signal to rotate the rotation motor 164. In response to the rotation of the rotation motor 164, the fluorescent wheel 1612 rotates.

[0022] The light source 1611 includes, for example, a red light emitting LED (Light Emitting Diode) and a blue LD (Laser Diode). The fluorescent wheel 1612 is a circular metal plate having an area with a phosphor layer and a diffuse transmission surface. When light in the blue wavelength band is irradiated on the phosphor layer, light in the green wavelength band is excited and emitted. The diffuse transmission surface transmits the light in the blue wavelength band while diffusing it. The rotating operation of the fluorescent wheel 1612 generates light in the green wavelength band, which has a wavelength different from the wavelength of the incident light, based on a part of the light in the blue wavelength band incident from the blue LD. The light in the blue wavelength band other than the part that was not diffused by the fluorescent wheel 1612 transmits the diffuse transmission surface as it is. As a result, red, green, and blue lights are obtained.

[0023] The optical system 162 converts the red, green, and blue light emitted from the light-emitting unit 161 into parallel light using a lens optical system, switches between output and non-output for each time and pixel by time division, and outputs the parallel light as a projected image from the projection device 1. The optical system 162 includes a display element 1621.

[0024] The display element 1621 is a spatial optical modulator (SOM), and may be, for example, a digital micromirror device (DMD). The DMD has, for example, a plurality of micromirrors arranged in an array of x pixels in the horizontal direction (horizontal) of the image by y pixels in the vertical direction (vertical) of the image. Whether or not the light incident on the display element 1621 is reflected in the outgoing direction is determined by individually switching the inclination angle of each micromirror at high speed according to each pixel of the projected image. As a result, the display element 1621 determines whether or not the light is reflected to the projection lens group that emits light corresponding to the projected image from the projection device 1 for each color unit and each image frame unit that are output in a time-division manner. The reflected light of the display element 1621 forms an optical image of the image to be projected. The light that passes through the projection lens group is magnified to a magnification adjusted by the zoom lens, output to the outside from the light output port, and reaches the projection surface. As a result, an image corresponding to the optical image is projected on the projection surface.

[0025] The emission driver 17 operates each element of the DMD of the display device 1621 in accordance with image data of the projection contents, and switches between emission and non-emission of light of each wavelength for each pixel position, that is, for each projection direction.

[0026] The cooling unit 18 has a blower motor 182 that rotates a blower fan for releasing (dissipating) heat inside the housing of the projection device 1, and a blower drive unit 181 that outputs a drive signal according to the rotation speed, etc., to the blower motor 182. The number of blower fans and the corresponding blower motors 182 may be determined arbitrarily, and these may each be driven and controlled independently. Among the above, at least the CPU 11 and the RAM 12 are included in the computer of the projection device 1 of this embodiment. This computer may also include a storage unit 13 and a communication interface 142.

[0027] Next, image projection by the projection device 1 of this embodiment will be described. The projection device 1 can display an image input from the video input terminal 141, and can also project an image of the built-in image data 133. The built-in image data 133 can include, for example, an initial image that is generally displayed when projection is started by power being supplied in response to an ON operation of a start-up switch or the like. The built-in image data 133 can be rewritten and set by a user's input operation to the operation acceptance unit 151 or the operation reception unit 152 and by receiving image data via the communication interface 142. The built-in image data 133 may include data of one image of the same size as a full-size normal image input from the outside. That is, the built-in image data 133 corresponds to the image data relating to one image in this embodiment. Since a general projection device requires a start-up time to project an image with a stable amount of light, during that time, a start-up image such as a logo is projected before the projection of a normal image to indicate that the device is starting up or that there is no malfunction. For this reason, the projection device stores and saves data of the start-up image inside. The projection device 1 in this embodiment may store image data relating to the one image in the storage unit 13 instead of the start-up image data. Alternatively, both the data of the startup image and the image data relating to the one image may be stored in the storage unit 13.

[0028] FIG. 3 is a diagram showing an example of an image included in the built-in image data 133. As shown in FIG. The built-in image data 133 is such that the single image is divided into a plurality of areas, for example, four areas A1 to A4 (partial areas), and each area includes an independent small image. Each area A1 to A4 may be rectangular, for example, and may have the same size, here, (x / 2)×(y / 2) pixels, which is 1 / 2 the horizontal and vertical projection range (number of pixels) of x×y. Here, x is the number of images arranged in the horizontal direction, and y is the number of images arranged in the vertical direction. The projection device 1 selects one of these areas as the first partial area. The unselected areas belong to the second partial area. The image enlargement rate is adjusted so that the selected area is projected so as to substantially coincide with the entire projection range of the image by the emission driving unit 17, and the other small images of the second partial area are outside the projection range. That is, the projection device 1 selectively displays one of the small images by performing digital zoom control on a single fixed image. The unselected small images are not projected.

[0029] FIG. 4 is a diagram illustrating image projection. As shown in FIG. 4(a), when a small image in area A1 is selected as the image to be projected, the center position C of area A1 is set as the projection center position in order to project only area A1. Also, a magnification ratio E is set to four times that when the entire image related to the built-in image data 133 is displayed. As described above, the magnification ratio E is the sum of squares of the ratio of the number of pixels (x / 2, y / 2) of the small image to the number of pixels (x, y) of the projectable range fixed according to the display element 1621. That is, the magnification ratio E is determined according to the number of pixels of the area corresponding to the small image. Here, the vertical magnification ratio Ey and the horizontal magnification ratio Ex of the image are both 2 times, which is the square root of the magnification ratio E. For example, when the center position C of the selected area is the coordinates (xc, yc), the position on the image data assigned to the pixel at the upper left corner of the projection image using the magnification ratio E is set to (xc-x / √E, yc-y / √E). The projected image, i.e., the pixels assigned to each micromirror of the display element 1621 of the projection device 1, is determined by an interpolation process that enlarges the original pixel arrangement by √E times, for example, with the pixel at the top left corner as a reference. As a result, the area on the image data corresponding to the driving range of the emission driving unit 17 becomes the range of area A1 shown in FIG. 4(b). That is, the small image in area A1 is selectively projected, and the small images in areas A2 to A4 are not projected. The coordinates of the center position C and the magnification rate E or the size of the small image (number of vertical and horizontal pixels) are stored in the condition setting 132 for each small image. The condition setting 132 may also store the conditions for selecting each small image.

[0030] In this way, the projection device 1 collects data of a plurality of images that can be projected as small images in advance into a single piece of built-in image data 133 and stores the collected data as small images. The projection device 1 receives an image captured by the image capture device 9 via the communication interface 142.

[0031] The CPU 11 acquires information on the surroundings of the projection surface, i.e., on passing workers and passing vehicles, from the captured image. The CPU 11 selects one of the small images from the built-in image data 133 as the projection content according to the acquired surroundings of the projection surface. The CPU 11 sets the center position C and the magnification ratio of the image so that an area including the selected small image is selectively projected. Therefore, the projection device 1 can selectively project one of the multiple small images without reacquiring or processing the image data itself. Such processing is continuously and repeatedly executed. While this processing is continuously repeated, the built-in image data 133 may be expanded as pixel-by-pixel data and continuously stored in the RAM 12. The communication interface 142 and the CPU 11 correspond to a status acquisition unit of this embodiment. The process of identifying surrounding workers H and the like from the captured image may use image recognition technology. The image recognition technology may be a conventionally known technology. Alternatively, when a detection sensor such as an infrared sensor is simply used, the presence or absence of a work vehicle or worker H may be determined based only on the presence or absence of detection.

[0032] 5 is a flowchart showing the control procedure of the projection control process executed by the CPU 11 of the projection device 1. This projection control process, including the projection control method of this embodiment, is started by periodically reading out the program 131 at a predetermined interval. The interval may be determined according to the reception interval of the captured images from the image capturing device 9. When the image capturing interval of the image capturing device 9 is short, the interval may be set to about several times the reception interval.

[0033] The CPU 11 acquires peripheral information from the received captured image (S1). The peripheral information includes information on the presence and location of approaching work vehicles and workers. The CPU 11 refers to the condition setting 132 and selects a display image according to the situation (S2).

[0034] For example, if only a worker is approaching the intersection and there are no work vehicles nearby, a caution image occupying the above-mentioned area A1 is selected. If only a manned work vehicle is approaching the intersection and there is no worker nearby, a caution image showing area A2 is selected. If a worker is approaching the intersection and an unmanned work robot is also approaching nearby, a stop request image showing area A3 is selected. If both a worker and a manned work vehicle are approaching the intersection, a warning image showing area A4 is selected.

[0035] The CPU 11 determines whether the selected image is different from the currently selected and displayed image (S3). If it is determined that the selected image is different from the currently displayed image (S3; Y), the CPU 11 changes the settings to the center position and magnification ratio according to the selected image (S4). The operation of the emission driver 17 is changed according to the changed settings. Then, the CPU 11 ends the projection control process. Among the above, steps S2 and S4 constitute the setting means of this embodiment.

[0036] If it is determined that the selected image is the same (not different) from the currently displayed image (S3; N), the CPU 11 ends the projection control process.

[0037] As described above, the projection device 1 of this embodiment includes the CPU 11 and the emission drive unit 17 that switches whether or not to emit light from the light emitting unit 161 in the projection direction of each pixel according to image data related to the projection content. The CPU 11 operates the emission drive unit 17 to selectively project an area including any of the small images among the areas A1 to A4 as the projection content, from image data related to one image including the areas A1 to A4 to which different small images are respectively assigned. As a result, the projection device 1 does not need to obtain image data from the outside every time for multiple projection target images, and does not need to alternately read out and process multiple image data. Therefore, the projection device 1 can selectively project a desired image easily and reliably. In particular, even when the reliability of communication connection with the outside is low or the communication speed is slow, the projection device 1 can stably and quickly project a desired small image.

[0038] Moreover, one image included in the built-in image data 133 has small images of areas A2 to A4 in positions different from the small image of area A1. The CPU 11 may enlarge the small image so that the selected area is displayed in the entire range that can be projected by the emission driving unit 17, and may operate the emission driving unit 17 so that the unselected areas are not projected. Therefore, the projection device 1 can easily and reliably switch between small images and project any of the small images at an image size that the projection device 1 can project, without replacing or processing the built-in image data 133 itself.

[0039] Moreover, the areas A1 to A4 may be rectangular. The CPU 11 may make the range of the selected area correspond to the driving range of the micromirror by the emission driving unit 17 based on the center position C and size of the selected area, i.e., the number of pixels in the vertical and horizontal directions. That is, by enlarging the small image to the maximum size that can be projected, other small images included in the original image data are not displayed because they simply extend outside the projection range. Therefore, the projection device 1 does not need to take the trouble of separately generating output target image data from which data of small images not to be projected is deleted. Therefore, the projection device 1 can easily operate the emission driving unit 17 according to the image to be projected.

[0040] The projection device 1 may also include a storage unit 13 that stores built-in image data 133. In this way, the projection device 1 can switch between and project multiple images by simply storing one image data. On the other hand, the projection device 1 does not need to sequentially obtain image data from an external device, and can avoid delays due to communication and display problems due to communication interruptions.

[0041] The projection device 1 also includes a communication interface 142 that receives image data of the surroundings of the projection screen of the projection content. The CPU 11 may acquire the surroundings of the projection screen based on the received image data. The CPU 11 may determine one of the small images as the projection content according to the acquired surroundings of the projection screen. In this way, the projection device 1 can easily obtain the surrounding conditions necessary for selecting a small image by acquiring the photographing data of the photographing device 9. This allows the projection device 1 to appropriately select a projection target from a plurality of small images and project the small image of the selected projection target.

[0042] The projection control method of the present embodiment is a projection control method for a projection device 1 including an emission drive unit 17 that switches whether or not to emit light in the projection direction of each pixel according to image data related to the projection contents. In this projection control method, the emission drive unit 17 is operated so as to selectively project an area including any one of the small images as the projection contents from built-in image data 133 related to one image including a plurality of areas A1 to A4 to which different small images are respectively assigned, among the plurality of areas A1 to A4. According to this projection control method, the processing of the image data itself in the projection device 1 is omitted, and multiple display images can be switched and displayed simply by selecting a display area in one image. Therefore, this projection control method can easily and reliably display the required small images.

[0043] Furthermore, by installing and executing the program 131 of this embodiment on a computer, it is not necessary to re-read the image data, particularly the time and effort required for obtaining the data via communication from an external device, and the necessary small images can be easily and reliably displayed based on on-the-spot judgment.

[0044] The present invention is not limited to the above-described embodiment, but may be modified in various ways. For example, in the above description, the selected small image is displayed on the entire surface that can be displayed on the display element 1621, but this is not limited to the above. When outputting an unimportant notification image when there is no danger, a smaller image may be projected compared to when there is danger. Also, for an image that is not displayed on the entire screen, the projection position of the image may be changed within the displayable range. Also, in the case of a projection device 1 in which the projection direction of an image itself can be changed, the projection direction may be changed according to the small image to be projected regardless of the above.

[0045] In the above description, one of the four small images is selected and projected continuously, but this is not limiting. When the worker H is not around, the projection of the image may be interrupted. In addition, the projected image may be displayed in a blinking manner or the brightness may be changed periodically depending on the degree to which the worker H needs to be careful.

[0046] In the above description, the built-in image data 133 is divided into four areas A1 to A4 of the same size, but this is not limited to this. The sizes of the areas may be different from each other. For example, an area of ​​a small image with a large number of characters and small character size may be relatively larger than the other areas, so that it can be displayed at a relatively small magnification. The number of areas does not have to be four. The number of areas may be more or less than this. The built-in image data 133 may be two or more pieces of image data. For example, there may be two pieces of image data each having four areas, and any one of a total of eight small images may be selectively projected.

[0047] Also, the image may be of an indefinite size, such as horizontally or vertically long, depending on the image. In this case, when the small image is selectively projected, the center position C may be located outside the original image area. Each area of ​​the small image does not necessarily need to be in contact with each side of the original image of the built-in image data 133. However, an image that is not in contact with each side may have the same aspect ratio as the original image, or a margin may be defined around the small image so that the aspect ratio is the same as the original image.

[0048] In the above, the area of ​​one of the small images is enlarged so that the areas of the other small images are not included in the projection range, but this is not limited to the above. If the original image of the built-in image data 133 has margins around each small image and other small images are excluded from the projection range simply by moving the center position of the projection range, the small images do not need to be enlarged and projected. In this case, the projection device 1 does not need to be able to enlarge and project a part of the image.

[0049] In the above description, the display image is a projection of a part of the built-in image data 133, but this is not limited to the above. In a situation where a communication connection with the outside is possible, there may be a case where image data including a similar plurality of small images is obtained from the outside. In this case, it is not necessary to obtain image data from the outside every time, and the built-in image data 133 may be updated at appropriate intervals.

[0050] In the above description, the projection device 1 is installed in a workshop, but the present invention is not limited to this. For example, the projection device 1 can be used in private areas such as indoor parking lots where moving objects such as vehicles intersect with the paths of pedestrians. The moving objects may include wagons, carts, and wagons that are pushed or pulled by humans.

[0051] In the above description, the surrounding situation is detected from the image captured by the image capture device 9, and the small image to be projected is switched according to the detection result, but this is not limited to the above. The image capture device 9 itself may obtain the detection result, and the information on the detection result may be input to the projection device 1. Alternatively, without the image capture device 9, the projection device 1 may periodically switch between small images at a certain time interval in order or randomly.

[0052] In addition, in the above, the projection device 1 using the SOM has been described as an example, but the present invention is not limited to this, and any projection device that can project an image based on digital image data may be used.

[0053] In the above description, the storage unit 13 is exemplified as a computer-readable medium for storing the program 131 related to the projection control of the present invention, which is made up of a non-volatile memory such as a flash memory, but is not limited thereto. As other computer-readable media, other non-volatile memories such as a hard disk drive (HDD) and an MRAM, and portable recording media such as a CD-ROM and a DVD disk can be applied. In addition, a carrier wave is also applied to the present invention as a medium for providing the data of the program related to the present invention via a communication line. In this disclosure, the term "or" is used to refer to non-exclusives unless otherwise specified, for example, the term "A or B" means "any of (A but not B), (B but not A), and (A and B)." In this disclosure, terms such as "first" and "second" are applied merely for convenience in description, unless otherwise specified, and the numerical values ​​do not imply any other kind of ordering (e.g., spatial, temporal, logical, etc.). In addition, the specific configurations, contents and procedures of the processing operations, etc. shown in the above embodiments can be modified as appropriate without departing from the spirit of the present invention. The scope of the present invention includes the scope of the invention described in the claims and its equivalents. [Explanation of symbols]

[0054] 1 Projection device 9. Imaging Equipment 11 CPU 12 RAM 13 Storage section 131 Programs 132 Condition Settings 133 Built-in image data 14 Communications Department 141 Video input terminal 142 Communication Interface 151 Operation reception section 152 Operation receiving unit 16 Projection section 161 Light emitting part 1611 light source 1612 Fluorescent Wheel 162 Optical system 1621 Display element 163 Rotation drive unit 164 Rotational Motor 17 Emission drive unit 18 Cooling section 181 Blower drive unit 182 Blower motor C center position E, Ex, Ey magnification

Claims

1. A control unit; an emission driver that switches whether or not light is emitted in the projection direction of each pixel in accordance with image data relating to the projection content; Equipped with The control unit is Operate the emission driving unit so as to selectively project a first partial area including one of the plurality of partial areas as the projection content, from image data relating to one image including a plurality of partial areas to which different small images are respectively assigned, among the plurality of partial areas; Projection device.

2. the plurality of partial regions includes a second partial region at a position different from the first partial region, The projection device according to claim 1 , wherein the control unit operates the emission drive unit to enlarge the first partial region so that it is displayed in an entire range that can be projected by the emission drive unit, and to operate the emission drive unit so that the second partial region is not projected.

3. The subregion is rectangular; the control unit causes a range of the first partial region to correspond to a drive range of the emission drive unit based on a center position and a size of the first partial region; 3. The projection device according to claim 2.

4. The projection device according to claim 1 , further comprising a storage unit that stores image data relating to the one image.

5. A situation acquisition unit that acquires a situation around a projection screen of the projection content, The control unit determines one of the small images as the projection content according to the acquired surrounding situation of the projection screen.

2. The projection device of claim 1.

6. A projection control method for a projection device having an emission driver that switches whether or not to emit light in a projection direction of each pixel according to image data related to a projection content, comprising: Operate the emission driving unit so as to selectively project a first partial area including one of the plurality of partial areas as the projection content, from image data relating to one image including a plurality of partial areas to which different small images are respectively assigned, among the plurality of partial areas; Projection control method.

7. A computer of a projection device including an emission driver that switches whether or not light is emitted in the projection direction of each pixel according to image data related to the projection content, A setting means for operating the emission driving unit so as to selectively project a first partial area including one of the plurality of partial areas as the projection content, from image data relating to one image including a plurality of partial areas to which different small images are respectively assigned; Programs including.

Images