JP2019078901A - Projection device and control method thereof, and program - Google Patents

Abstract

To provide a projection device and a control method thereof, and a program with which it is possible to prevent a page for the number of projectors constituting stack projection from being changed when changing a slide page being displayed by, for example, holding up a hand toward a screen.SOLUTION: A projector 100 projects for display on a screen 103 a projection image 104 generated on the basis of the image data of a prescribed page of a slide composed of a plurality of pages inputted from a PC 101 and, after obtaining a captured image by imaging the screen 103 in that state, detects on the basis of this captured image whether or not there is a hand held up toward a marker 105 included in the projection image 104 projected for display to the screen 103. The projector 100 further sets whether or not to enable the issuance of a slide page change command to the PC 101 when the hand holding-up is detected while in a stack projection state by the projectors 100, 100a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a projection apparatus and its control method and program, and more particularly to a projection apparatus which performs stack projection, its control method and program.

  Conventionally, when using a projector for a presentation, a method is known in which material data stored in a PC (Personal Computer) or the like is received and the material data is projected on a projection surface such as a screen.

  In addition, when data consisting of slides of a plurality of pages is used as material data used for a presentation, the presenter needs to perform an operation such as sending or returning a page of the slide (hereinafter referred to as “slide page change operation”).

  Here, if the slide page change operation is performed on a PC connected to the projector, the presenter has to move many times between the screen and the PC during the presentation. As a method for solving such a problem, there is a technique in which a projector detects a slide page change operation when a presenter in the vicinity of the screen holds a hand or pointer over an icon image projected on the screen (for example, Patent Document 1) reference).

  Further, in recent years, a demand for increasing the brightness of an image projected from a projector onto a screen has been increasing. As one of the means for increasing the brightness, there is known a means (stack projection) for increasing the brightness by overlapping projection planes from a plurality of projectors (see, for example, Patent Document 2). The stack projection can increase the brightness as the number of projection images to be superimposed on the projection plane increases. For this reason, a presentation may be performed by a stack projection composed of a plurality of projectors according to the required luminance. Also in the case of such stack projection, there is a demand that the slide page change operation is not performed by the PC, but realized by holding the hand or pointer over the icon image projected onto the screen.

JP, 2011-164878, A JP 2001-272723 A

  However, Patent Document 1 does not consider a case where slide page change operation realized by holding a hand or pointer over an icon image projected on a screen is performed in a stack projected state. As a result, slide pages for the number of projectors constituting the stack projection are sent and returned, and there is a problem that the presentation as intended by the presenter can not be realized. Further, Patent Document 2 only discloses setting the brightness and the like of each projector by projecting the individual menu of each projector constituting the stack projection onto the screen, and the above problem can not be solved. . On the other hand, if the program dedicated to stack projection is installed in advance in the PC, such a problem can be solved, but when connected with a PC in which the dedicated program is not installed, the problem remains.

  Therefore, the present invention can prevent the change of pages by the number of projectors constituting the stack projection when changing the page of the slide being displayed by hand holding the screen or the like, and its control method , As well as to provide programs.

  A projection device according to a first aspect of the present invention is a projection device, which is an input device for inputting image data of a predetermined page of a slide composed of a plurality of pages from an external device, and a first one based on the input image data. An image generation unit that generates an image, a projection unit that projects and displays the first image on a projection surface, and an image of the projection surface on which the first image is projection displayed to obtain a second image Based on the imaging means and the second image, it is detected whether or not a pointer exists between the projection device and a specific area included in the first image projected and displayed on the projection surface. And projecting a third image generated based on the image data input from the external device by the first detecting unit and the other projection device on the projection surface to project and display the third image. Whether it is possible stack projection state Determining that the stack projection state is determined by the determination means, and the slide page change command is issued to the external device when the presence of the pointer is detected by the first detection means And setting means for setting whether or not to be set.

  According to the present invention, it is possible to prevent the pages of the number of projectors constituting the stack projection from being changed when changing the page of the slide being displayed by hand holding the screen or the like.

FIG. 6 is a diagram for explaining a presentation using stack projection by two projectors as the projection apparatus according to the first embodiment. It is a block diagram which shows the internal structure of two projectors of FIG. 1 in a stack | stuck projection state. It is a block diagram which shows the internal structure of PC in FIG. 5 is a flowchart illustrating a procedure of presentation mode execution processing according to the first embodiment. It is a flowchart which shows the procedure of the hand-hold continuation detection process of step S106 of FIG. It is a figure for demonstrating the positional relationship of the projection image and marker which are projected and displayed in FIG.4 S102. It is a figure for demonstrating the method of hand over detection of step S104 of FIG. It is a flowchart which shows the procedure of the modification of the presentation mode execution process of FIG. It is a flowchart which shows the procedure of the other modification of the presentation mode execution process of FIG. FIG. 5 is a diagram for describing a case where an instruction as to whether or not a stack projection state is received from the user via an OSD in step S100 in FIG. 4. 15 is a flowchart illustrating a procedure of presentation mode execution processing according to the second embodiment. It is a flowchart which shows the procedure of the modification of the presentation mode execution process of FIG. FIG. 12 is a diagram for describing a case of receiving an instruction of a screen collaboration (stack) projector from a user via an OSD in step S112 of FIG. 11;

  Hereinafter, although the example of the present invention is described in detail with reference to the drawings, the present invention is not limited to the following embodiments.

Example 1
Hereinafter, a projector as a projection apparatus according to the present embodiment will be described. In the present embodiment, the case of stack projection using two projectors will be described, but the number of projectors constituting the stack projection is not limited to two.

<Overall configuration>
A presentation using stack projection by two projectors according to this embodiment will be described with reference to FIGS. 1 (a) and 1 (b).

  First, a presentation using only one projector and not a stack projection will be described with reference to FIG. 100 is a projector. The projector 100 receives image data of a predetermined page of a slide composed of a plurality of pages for presentation from a signal source personal computer 101 (hereinafter referred to as “PC 101”) via a video cable 102. The projector 100 generates a projection image 104 based on the input image data, and projects and displays the projection image 104 on the screen 103. The projector 100 can superimpose and display the marker 105 in the projection image 104. The projector 100 incorporates a camera 214 described later, and captures an image of the screen 103 by the camera 214.

  Here, it is assumed that the presenter 106 stands at a position A near the screen 103 when giving a presentation using a projection image 104 projected and displayed on the screen 103 to an audience (not shown). Since the position A is far from the PC 101, the presenter 106 standing at the position A can not perform an operation for sending or returning a slide page (hereinafter referred to as “slide page change operation”) on the PC 101. In such a case, the presenter 106 can perform a slide page change operation by holding the hand 107 over the marker 105 on the projected image 104. When the projector 100 detects its hand holding up by the camera 214, it instructs the PC 101 via the control cable 108 to update the image data (slide page feed, return, etc.) in accordance with the slide page change operation. The PC 101 that has received the instruction transmits the updated image data (image of slide of next page, image of slide of previous page, etc.) to the projector 100. The projector 100 projects and displays an image generated based on the updated image data as a projection image 104 on the screen 103. As a result, the presenter 106 can advance the presentation with the projected image 104 of the slide of the desired page projected and displayed on the screen 103.

  Next, a presentation using stack projection by two projectors will be described using FIG. 1 (b). Hereinafter, in FIG. 1 (b), the same reference numerals are given to parts common to FIG. 1 (a), and the description will be omitted.

  In FIG. 1B, stack projection is realized by superimposing the projection image 104a projected and displayed by the projector 100a on the projection image 104 projected and displayed by the projector 100 on the screen 103. The projector 100 a generates a projection image 104 a based on the image data input from the PC 101 via the video cable 102 a, and projects and displays the projection image 104 a so as to overlap the projection image 104 on the screen 103. The projector 100a can superimpose and display the marker 105a in the projection image 104a. Markers 105 and 105 a are also superimposed on the screen 103. Stacked projection is realized by superimposing the projected images 104 and 104 a and the markers 105 and 105 a on the screen 103, and the brightness of the image projected and displayed on the screen 103 can be enhanced. The presenter 106 can perform a slide page change operation by holding the hand 107 over the markers 105 and 105a superimposed on the superimposed projected images 104 and 104a, respectively. One projector (the projector 100a in the first embodiment) which forms the stack projection updates the image data (slide page) according to the slide page change operation in the PC 101 via the control cable 108a when the hand holding is detected. Instructs sending, returning, etc.). The other projectors (the projector 100 in the first embodiment) that constitute the stack projection do not issue such an instruction to the PC 101. The PC 101 that has received the instruction transmits the updated image data (image of slide of next page, image of slide of previous page, etc.) to the projectors 100 and 100a. The projectors 100 and 100a project and display an image generated based on the updated image on the screen 103 as projected images 104 and 104a, respectively. That is, only one of the projectors constituting the stack projection instructs the PC 101 to update the image data. As a result, even in the stack projection state, the presenter 106 can advance the presentation in a state where the projection images 104 and 104a of the slide of the desired page are projected and displayed on the screen 103.

  Thus, in the stack projection configured by the projectors 100 and 100a, the presenter 106 can advance the presentation without directly performing the slide page change operation on the remote PC 101.

  Here, in the present embodiment, the presenter 106 holds the hand over the markers 105 and 105a. However, the present invention is not limited to this, and may be a pointer or pointer such as a pointer (not shown) or a pointer. Further, in the present embodiment, the markers 105 and 105a are superimposed on the lower right area toward the screen 103 in FIG. 1, but the present invention is not limited to this area. That is, any area may be used as long as the presenter 106 can hold the pointer such as the hand 107 or the pointer (not shown) or a pointer included in the projected image 104.

<Detailed Configuration of Projector>
Next, the internal configuration of the two projectors 100 of FIG. 1 in the stack projection state will be described using the block diagram of FIG. Since the projectors 100 and 100a have the same internal configuration, only the internal configuration of the projector 100 will be described below, and the description of the internal configuration of the projector 100a will be omitted.

  200 is a control unit. The control unit 200 is configured of a microcomputer and controls the entire projector 100. The operation of the control unit 200 will be described later.

  201 is a bus. The control unit 200 can communicate with each unit in the projector 100 via the bus 201.

  202 is a ROM. The ROM 202 is a non-volatile memory, and stores program codes and data for the control unit 200 to operate. The ROM 202 also stores data necessary for the projector 100 to operate.

  Reference numeral 203 denotes a RAM. The RAM 203 is a volatile memory and is used as a work memory for the control unit 200 to operate.

  Reference numeral 204 denotes an image input unit. The image input unit 204 inputs image data from an external device such as the PC 101, converts the image data into a format that can be processed by a circuit in the subsequent stage, and outputs the image data to the image processing unit 205.

  Reference numeral 205 denotes an image processing unit. The image processing unit 205 performs image quality correction such as brightness correction, black level correction, color correction, color conversion, and gamma correction on the input image data according to an instruction of the control unit 200. Furthermore, distortion correction such as enlargement / reduction, frame rate conversion, or trapezoidal correction or free-form surface correction is also performed. Further, the image processing unit 205 can superimpose and display the image designated by the control unit 200 on the input image data in accordance with the instruction of the control unit 200. As a result, the marker 105 described above or a menu image (OSD) for prompting the presenter 106 to perform an operation can be displayed in a superimposed manner. The image processing unit 205 outputs the processed image data as a projection image 104 to a panel drive unit 206 described later.

  Reference numeral 206 denotes a panel drive unit. The panel drive unit 206 converts the input image data into gradation so that the degree of light modulation in the liquid crystal panel 212 described later becomes linear. The image data after conversion is converted into a drive signal for forming an image on a liquid crystal panel 212 described later, and is output to the liquid crystal panel 212.

  Reference numeral 207 denotes a light source control unit. In response to an instruction from the control unit 200, the light source control unit 207 controls the light source 209, which will be described later, to turn on or off, and to change the luminance.

  Reference numeral 208 denotes an optical system. The optical system 208 includes a light source 209, which will be described later, an illumination optical system 210, a color separation / combination optical system 211, a liquid crystal panel 212, and a projection optical system 213. The light from the light source 209 is modulated by the liquid crystal panel 212 by the optical system 208 and projected to the outside of the projector 100, and the projection image 104 is displayed on the screen 103.

  209 is a light source. As the light source 209, a high pressure mercury lamp, a halogen lamp, an LED (light emitting diode), or a laser light source can be used. The light source 209 may use a white light source, or may be configured to include a plurality of light sources for each of R (Red), G (Green), and B (Blue) color components. Alternatively, it may be composed of a B light source and a phosphor for converting B light into Y light.

  Reference numeral 210 denotes an illumination optical system. The illumination optical system 210 is composed of a plurality of lenses, and makes the light from the light source 209 uniform and collimated to illuminate the liquid crystal panel 212 described later.

  Reference numeral 211 denotes a color separation / combination optical system. The color separation / combination optical system 211 includes a liquid crystal panel 212 described later. The color separation / combination optical system 211 has a color separation optical system that separates the light from the illumination optical system 210 into red, blue and green lights, and causes the liquid crystal panel 212 to emit the separated lights. In addition, it has a color combining optical system that combines each light output from the liquid crystal panel 212, and outputs the light after combining each light to the projection optical system 213.

  Reference numeral 212 denotes a liquid crystal panel. An image is formed on the liquid crystal panel 212 by the drive signal generated by the panel drive unit 206. As the liquid crystal panel 212, a transmissive liquid crystal panel or a reflective liquid crystal panel can be used.

  213 is a projection optical system. The projection optical system 213 is configured of a lens or the like that emits light emitted from the light source 209 and modulated by the liquid crystal panel 212 as the projection image 104 to the outside.

  The optical system 208 may be modified in various forms. For example, if the light source 209 exists for each color, the color separation / combination optical system 211 may not have a color separation optical system. In addition, if the liquid crystal panel 212 is a single plate and is configured to output each color in a time division manner, the color separation / combination optical system 211 may not have the color combination optical system. The optical system 208 may have a configuration in which the projection image 104 is displayed by scanning the screen 103 with spot light modulated according to the image data without the liquid crystal panel 212. As described above, the optical system 208 is not limited to the form of the present embodiment as long as it is an optical system that can modulate light based on image data received from an external device and can project an image.

  214 is a camera. The camera 214 captures the projection image 104 on the screen 103 in accordance with an instruction from the control unit 200. Details will be described later.

  Reference numeral 215 denotes an operation unit. The operation unit 215 is a button or a touch screen for receiving an instruction from the user such as the presenter 106 or the like. The operation unit 215 can receive, for example, an instruction to turn on or off the power, an instruction to perform image processing, and an instruction to start or end a presentation mode, which will be described later, from the user.

  216 is a communication unit. The communication unit 216 includes a module (not shown) that performs wired communication via the control cable 108 or the like and a module (not shown) that performs wireless communication. The communication unit 216 connects the projector 100 to a network (not shown), and can transmit and receive command data and image data to and from an external device via the network. For example, a command equivalent to the instruction from the user received by the operation unit 215 can be received via the communication unit 216. As the communication unit 216, a controller for communication such as USB (Universal Serial Bus), Ethernet (registered trademark), wireless LAN, Bluetooth (registered trademark), or the like can be used.

<Detailed configuration of PC>
Next, the internal configuration of the PC 101 will be described using the block diagram of FIG.

  300 is a CPU. The CPU 300 controls the entire PC 101.

  Reference numeral 301 denotes a RAM. The RAM 301 is a volatile memory and is used as a work memory for the CPU 300 to operate. The RAM 301 is also used as a frame buffer for outputting image data by the video controller 302 described later.

  Reference numeral 302 denotes a video controller. The video controller 302 stores the image data on the RAM 301 according to the instruction of the CPU 300, and outputs the image data through the video cable 102.

  Reference numeral 303 denotes a network controller. The CPU 300 can mutually communicate with an external device via the network controller 303.

  Reference numeral 304 denotes a hard disk unit. The hard disk unit 304 is used to store various data. As stored data, there are an OS (Operating System) for the CPU 300 to operate, a program code of an application, data used when executing them, and multimedia content.

  Reference numerals 305a and 305b denote USB controllers, respectively. The USB controllers 305a and 305b are used to connect with various peripheral devices. For example, a mouse or keyboard (not shown) can be connected for operation from the user. In the present embodiment, the USB controller 305a is connected to the communication unit 216 of the projector 100 via the control cable 108, and a mouse (not shown) is connected to the USB controller 305b.

  306 is a video controller. The video controller 306 has the same configuration as the video controller 302, but is connected to a display unit (not shown) and used as a monitor output necessary for the user to operate the PC 101.

  307 is a bus. The CPU 300 can communicate with the video controller 302, the network controller 303, the RAM 301, the hard disk unit 304, the USB controllers 305 a and 305 b, and the video controller 306 via the bus 307.

  In the present embodiment, it is assumed that a presentation application is operating on the PC 101. This application selects a file for presentation based on the user's instruction. The presentation file is composed of data of slide images of multiple pages. The application causes the projectors 100 and 100 a to output data of the slide image of the predetermined page via the video controller 302 based on the user's instruction. Thus, the projectors 100 and 100 a project and display the projected images 104 and 104 a including the image of the slide of the predetermined page on the screen 103. Also, when PageUp button pressing information is received from a keyboard (not shown) connected to the USB controller 305b of the PC 101, data of the slide image of the page one page before the currently projected displayed page is output to the projectors 100 and 100a Let Thus, the projectors 100 and 100a update the projection images 104 and 104a to those including the image of the slide of the previous page, and perform projection display (slide back) on the screen 103. On the other hand, when the Page Down button press information is received, the data of the slide image of the page next to the page currently being displayed by projection is output to the projectors 100 and 100a. Accordingly, the projectors 100 and 100a update the projection images 104 and 104a to those including the slide image of the next page, and perform projection display (slide feed) on the screen 103.

<Basic operation of the projector>
Next, the basic operation of the projector 100 will be described. The projector 100 a is the same as the basic operation of the projector 100, and thus the description thereof is omitted.

  When AC power is supplied to the projector 100 by a power cable (not shown), the power is supplied to the control unit 200, the bus 201, the ROM 202, the RAM 203, the communication unit 216, and the operation unit 215, and the control unit 200 is activated and is in a standby state. It becomes. In the standby state, when the control unit 200 detects the reception of a power-on instruction from the user via the operation unit 215 or the communication unit 216, the control unit 200 activates each unit of the projector 100. That is, the control unit 200 performs control to supply power to each unit. As a result, the image input unit 204, the image processing unit 205, the panel drive unit 206, the light source control unit 207, and the camera 214 become operable. Further, the control unit 200 instructs the light source control unit 207 to cause the light source 209 to emit light, and operates a cooling fan (not shown). Thus, the projector 100 starts to project and display the image data received from the image input unit 204. Note that the control unit 200 may instruct the image processing unit 205 to perform menu display or image quality correction based on a command or the like received via the communication unit 216 or the operation unit 215.

  On the other hand, when the control unit 200 detects reception of a power-off instruction from the user via the operation unit 215 or the communication unit 216, the control unit 200 performs termination processing of each unit of the projector 100 to stop power supply to each unit. Take control. As a result, the control unit 200 enters the standby state again.

<Characteristic operation of the projector>
Next, the procedure of the presentation mode execution process, which is a characteristic operation of the projector 100 according to the present embodiment, will be described with reference to the flowchart of FIG. This process is performed by the control unit 200 of the projector 100 executing the program code read from the ROM 202.

  While the projector 100 is activated and performing projection display of the projection image 104 on the screen 103, when the control unit 200 receives a presentation mode start instruction via the operation unit 215 or the communication unit 216, the process shown in FIG. Is started. The presentation mode is a mode in which the slide page changing operation can be realized as intended by the presenter 106 by holding the hand or pointer over the marker 105 in the projected image 104 on the screen 103, and the details will be described below. explain. The projector 100 a is activated in the same manner as the projector 100, and performs projection display of the projection image 104 a in a state of being superimposed on the projection image 104 on the screen 103. That is, this presentation mode execution process is started in a state where stack projection configured by the projectors 100 and 100a is being performed.

  In addition, the user can individually set in advance whether the issuance of a predetermined command to be described later to the PC 101 in the stack projection state is enabled or disabled for each of the projectors 100 and 100a. In the present embodiment, it is assumed that the projector 100 is set to be invalid and the projector 100 a is set to be valid in advance.

  Although the setting method is not particularly limited, the valid / invalid may be set individually on the operation units 215 and 215a of the projectors 100 and 100a. Further, in the application for presentation operating on the PC 101, valid / invalid may be set individually for the projectors 100 and 100a.

  First, at step S100, control unit 200 detects whether or not it is in the stack projection state. Here, in the stack projection state, the projection image 104 a generated based on the image data input from another PC (in the present embodiment, the projector 100 a) from the PC 101 is superimposed and displayed on the projection image 104 by the screen 103. Refers to the possible state of In the present embodiment, when the control unit 200 receives an instruction to start a presentation mode in a stack projection state from the user via the operation unit 215 or the communication unit 216, the control unit 200 detects that the stack projection state is present. The user gives this instruction using the OSD shown in FIG. Specifically, the user first selects "setting" from the OSD in FIG. 10A, and then selects "presentation mode (stack)" from the OSD in FIG. 10B, and finally, as shown in FIG. This instruction is made by selecting "start" from the OSD of 10 (c).

  The OSD is not limited to the OSD shown in FIG. 10, and any OSD may be used as long as the user can indicate the stack projection state. Further, in the present embodiment, the user instructs the stack projection state using the OSD, but the method of the instruction is not limited to the OSD as long as the control unit 200 can receive the instruction of the stack projection state from the user. For example, a screen similar to the OSD in FIG. 10 may be displayed on the display unit connected to the video controller 306 of the PC 101, and the user may select an icon on the screen with a mouse connected to the USB controller 305b. Further, in this embodiment, the detection of the stack projection state is performed based on the instruction content from the user, but the method is not limited to the method based on the instruction content from the user as long as the method is capable of such detection. .

  Next, in step S101, the control unit 200 executes calibration for calculating a conversion equation between the coordinate system of the display image formed on the liquid crystal panel 212 and the coordinate system of the captured image captured by the camera 214. . In this embodiment, this calibration is performed as follows. First, the control unit 200 instructs the image processing unit 205 to display test patterns of a predetermined shape at a plurality of places on the screen 103. Next, the control unit 200 instructs the camera 214 to capture an image of the screen 103 on which a plurality of test patterns are displayed, and acquires the captured image. Next, the control unit 200 analyzes the captured image and calculates the positions in the captured image of the plurality of test patterns. In this way, the coordinates of a plurality of test patterns in the coordinate system of the display image (known when the control unit 200 designates the image processing unit 205), and the corresponding coordinates in the coordinate system of the captured image Is obtained, and a conversion equation between these coordinate systems can be calculated. After this calculation, the control unit 200 instructs the image processing unit 205 to end the superposition of the test pattern. The method of calibration is not limited to the above example, and other methods may be used.

  Next, in step S102, the control unit 200 causes the projection image 104 and the marker 105 thereon to be projected and displayed on the screen 103 as described with reference to FIG. Note that the projection display of the marker 105 is performed by displaying on the screen 103 an OSD that allows the user to select the projection display / non-projection display of the marker 105, and this OSD is performed at the timing when the display of the marker 105 is selected. It is also good.

  The positional relationship between the projected image 104 and the marker 105 at this time will be described with reference to FIG. The projected image 104 is output from the image processing unit 205 to the display area 600 of the screen 103. That is, the drive signal of the liquid crystal panel 212 is generated by the panel drive unit 206 based on the projected image 104, and the projected image 104 is formed on the liquid crystal panel 212 and projected on the display area 600 of the screen 103 outside the projector 100. The An image area 601 is an area in which the image data input from the image input unit 204 is arranged. The enlargement / reduction processing of the image data at this time and the arrangement processing to the image area 601 are performed by the image processing unit 205 in accordance with an instruction from the control unit 200. An area other than the image area 601 is a blank area 602, and the image processing unit 205 arranges pixels of black gradation according to an instruction from the control unit 200. Also, in the blank area 602, there is a marker area 603 (a specific area). The control unit 200 instructs the image processing unit 205 to display the image of the marker 105 in the marker area 603.

  In the present embodiment, although the positional relationship between the projected image 104 and the marker 105 is the relationship shown in FIG. 6, the relationship is not limited to this as long as the region corresponding to the marker region 603 is in the display region 600. For example, the image data received by the image input unit 204 may be arranged on the entire surface of the display area 600, and the marker area 603 may be arranged in the area.

  Next, in step S103, the control unit 200 determines whether or not there is a presentation end instruction from the user. For example, the control unit 200 may pass this instruction via the operation unit 215 or the communication unit 216. If there is an end instruction, this processing ends. If there is no end instruction, the process proceeds to step S104.

  Next, in step S104, the control unit 200 detects whether or not the hand 107 is held over the marker 105 of the projected image 104 by the presenter 106, that is, the presence or absence of the hand. Here, although the hand 107 is described as an example, the present invention is not limited to the hand 107 in applying the present invention. For example, any indicator such as a pointer or other indicator as long as it is an indicator blocking the light from the projector 100 to the marker 105 of the projected image 104 can be used.

  A method of detecting the presence or absence of the hand holding in step S104 will be described with reference to FIG. FIG. 7A is a diagram showing the positional relationship between the projector 100 and the screen 103, and shows a two-dimensional positional relationship when viewed from above for simplifying the description. Hereinafter, the position on the screen 103 will be described using horizontal coordinates on the screen 103. Although the description of the vertical coordinate on the screen 103 is omitted, it is the same as the horizontal direction.

  As described above, the projector 100 includes the camera 214 for imaging and the projection optical system 213 for projection. These are located at different positions, and have different optical axes (projected optical axis and imaging optical axis) indicated by the alternate long and short dash lines and the alternate long and two short dashes lines, respectively. A marker 105 is present on the projected image 104 projected and displayed on the screen 103. The display position of the marker 105 is between the point p 1 and the point p 2 on the screen 103. The camera 214 captures an image of the screen 103. The image which the camera 214 imaged at this time is demonstrated using FIG.7 (b). Reference numeral 700 denotes a part of the image captured by the camera 214, and the image of the marker 105 (marker image 701) is captured. The marker image 701 is located between the points q1 and q2 in the imaging coordinate system, and these points correspond to the points p1 and p2 on the screen 103, respectively. Further, regarding the obtained captured image, the horizontal axis in the image capture coordinate system is taken along the horizontal axis, and the luminance taken in the vertical direction is obtained, whereby a plot as shown in FIG. 7D is obtained. As shown in FIG. 7D, since the image of the marker 105 is visible between q1 and q2, the luminance is high. Also, on the outside between q1 and q2, the image of the blank area 602 described in FIG. 6 can be seen. In the present embodiment, since pixels of black gradation are arranged in the blank area 602, the luminance is low on the outside between q1 and q2.

  Next, consider that the presenter 106 holds the hand 107 over the marker 105 on the projection image 104 projected and displayed on the screen 103. In this case, as shown in FIG. 7A, the hand 107 is present between the projector 100 and the marker 105 included in the projected image 104 projected and displayed on the screen 103. Therefore, the image of the marker 105 emitted from the projection optical system 213 at this time is blocked by the hand 107 before reaching the screen 103 and displayed between the point r1 and the point r2 on the hand 107. On the other hand, when viewed from the camera 214, the image of the marker 105 displayed between the points r1 and r2 is observed in the same manner as displayed between the points p3 and p4 on the screen 103. An image captured by the camera 214 at this time will be described using FIG. 7C. Reference numeral 702 denotes a part of the image captured by the camera 214, and the image of the marker 105 (marker image 703) is captured. The marker image 703 is located between the point q3 and the point q4 in the imaging coordinate system, and these points correspond to the point p3 and the point p4 on the screen 103, respectively. Further, regarding the obtained captured image, the horizontal axis in the imaging coordinate system is taken on the horizontal axis, and the luminance taken in the vertical direction is obtained, whereby a plot as shown in FIG. 7E is obtained. As shown in FIG. 7E, the image of the marker 105 originally existing between q1 and q2 appears to move between q3 and q4, and the brightness between q3 and q4 is observed to be high. Therefore, unlike in FIG. 7D, it appears that the marker 105 is not displayed between q1 and q3. That is, on the outer side between q3 and q4, the image of the blank area 602 described in FIG. 6 and the shadow of the hand 107 can be seen. As described above, in the present embodiment, since the pixels of the black gradation are arranged in the blank area 602, the luminance is low on the outside between q3 and q4.

  Here, the position in the coordinate system of the display image to be formed on the liquid crystal panel 212 corresponding to the positions of the points q1 and q2 in the imaging coordinate system becomes known to the control unit 200 by the calibration performed in step S101. ing. Accordingly, the control unit 200 sets the position in the coordinate system of the display image of the display area (marker area 603) of the marker 105 projected and displayed on the screen 103 in step S102 to the position in the imaging coordinate system based on the calibration result. Convert to find the positions of points q1 and q2. In this step, the control unit 200 integrates the brightness between q1 and q2. When the hand 107 is not held over the marker 105, the intensities of q1 to q2 in FIG. 7D are integrated. On the other hand, when the hand 107 is held over the marker 105, the brightness of q1 to q2 in FIG. 7E is integrated. Therefore, the integral value obtained when the hand 107 is held is smaller than the integral value obtained when the hand 107 is not held. In the present embodiment, the presence or absence of a hand is determined based on the comparison of such integral values. The integral value obtained when the hand 107 is not held is recorded in advance as a predetermined threshold value in the ROM 202 or the like, and if the integral value is equal to or greater than the threshold value, no hand holding is detected. You may Also, for example, in step S101, the marker 105 is temporarily displayed, and from the imaging result at that time, the integral value of the brightness of q1 to q2 obtained when the hand 107 is not held is calculated and calculated. A predetermined threshold may be determined using the integrated value as a reference value. Furthermore, the predetermined threshold may be 50% of the reference value. In addition, when the integral value of the brightness of q1 to q2 obtained when the hand 107 obtained in step S104 is not held is held, and a predetermined threshold value is determined when the next step S104 is performed. It may be used as a reference value of In this case, a value of 80% of the reference value may be set as the predetermined threshold. Further, the present invention is not limited to the method of detecting that there is a hand holding when the luminance decreases as in this embodiment. For example, it is also conceivable that an indicator or the like with high reflectance is held over the marker 105. In this case, conversely, an increase in luminance is also conceivable. Therefore, a method may be used in which it is detected that a hand has been raised when a change in luminance occurs.

  In addition, you may use another method as a detection method of the presence or absence of hand holding. For example, the position of the marker 105 on the screen 103 may be detected by the camera 214, and the presence or absence of the hand may be determined by the change in the position. For example, when there is no hand holding, as shown in FIG. 7B, the marker image 701 of the captured image is positioned at q1 to q2 of the captured coordinates. On the other hand, when there is a hand holding, as shown in FIG. 7C, the marker image 703 of the captured image is positioned at q3 to q4 of the captured coordinates. That is, a difference in the detection position of the marker 105 is generated depending on the presence or absence of the hand. Further, this difference "d" can be obtained as d = ((q3 + q4)-(q1 + q2)) / 2. Thus, for example, the presence or absence of a hand can be detected by the following method. First, the position of the marker image 701 of the captured image when there is no hand holding at the time of calibration in step S101 is detected. Thereafter, the position of the marker image of the captured image obtained at the time of detection of the hand holding up in step S104 is detected, and the difference from the detection position at the time of calibration is compared with the value of d. As a result of comparison, if the difference is d or more, it is determined that there is hand holding, and if it is less than it, it is determined that it is.

  Next, in step S105, the control unit 200 determines whether the hand has been detected in step S104. If the hand has been detected, the process proceeds to step S106. If not detected, the process returns to step S103.

  At step S106, control unit 200 performs a hand hold detection process. The details of this process will be described below with reference to the flowchart of FIG.

First, in step S200, the control unit 200 resets the timing counter C ₁ to 0, and starts the process of incrementing the C ₁ every predetermined time in the counter circuit (not shown).

  Next, in step S201, the control unit 200 detects a hand holding. Since this detection process is equivalent to the process of step S104, the description is omitted.

  Next, in step S202, the control unit 200 determines whether or not the hand has been detected in step S201. If the hand has been detected, the process proceeds to step S203. If not detected, the processing ends as “no continuation detection”.

In step S203, the control unit 200, the value of the counter C ₁ which starts clocking in step S200 is either exceeds the thresholds T ₁ to a predetermined, i.e., determines whether the detected time has become a predetermined time or more. If not exceeded, the process returns to step S201. If it exceeds, the present process is ended as "with continuous detection".

  As described above, it is possible to determine whether or not the hand is stably detected by the process shown in FIG. Thereby, for example, when the hand 107 or other indicator crosses the marker 105 unintentionally, it is possible to prevent unintended slide feeding or the like from being performed.

  Returning to FIG. 4, next, in step S107, the control unit 200 determines whether or not the hand is continuously detected in step S106. If it is detected that the continuation is detected, the process proceeds to step S108. Otherwise, the process returns to step S103.

  Next, in step S108, the control unit 200 proceeds to step S109 if it is not in the stack projection state based on the result detected in step S100. Otherwise, the process returns to step S103. As described above, the issuance of the predetermined command to the PC 101 in the stack projection state is previously invalidated for the projector 100. Therefore, in this flowchart, when the stack projection state is in step S108, the process returns to step S103 without issuing a command in step S109 described later. On the other hand, the same process as the presentation mode execution process of FIG. 4 is performed on the projector 100a. However, for the projector 100 a, issuance of a predetermined command to the PC 101 in the stack projection state is set to be effective. Therefore, as a result of the determination in step S107, if it is determined that the hand holding is continuous, the process directly proceeds to step S109 described later without determining whether or not the stack projection state is in step S108, and issues a command.

  At step S109, control unit 200 transmits a predetermined command to PC 101 via communication unit 216. Here, the predetermined command is a slide page change command for realizing slide feed and slide return in a presentation. Although the format of the predetermined command is not particularly limited, for example, as in the keyboard (not shown) of the PC 101, button press information such as Page Up and Page Down may be sent as the predetermined command. After this, the process returns to step S103.

  Thus, even when the presenter 106 places the hand 107 or other indicator over the marker 105 during stack projection, the projector 100 does not issue the predetermined command to the PC 101. As a result, it is possible to prevent sending of command issuance for the number of stacks constituting the stack projection, and the presentation can be realized with the slide of the page displayed on the screen 103 as intended by the presenter 106. In this case, the projectors 100 and 100a constituting the stack projection perform the image data arrangement, the display of the markers, and the hand holding detection, but the projector which issues a command is only one projector 100a.

  In addition, although the example which transmits a command in step S109 after a hand holding was stably detected in step S106 was demonstrated, this invention is not limited to it. As another method, after stable hand detection is detected, command issuance control may be started at timing when the detection is not detected within a predetermined time. For example, when the presenter 106 stands at a position blocking the marker 105 and proceeds with the presentation as it is, there is a concern that the determination in step S107 becomes Yes and a command is issued. According to the method described above, the command can not be transmitted when the stable hand is too long.

  Although an example in which the image input unit 204 receives image data has been described, the present invention is not limited thereto. As another method, for example, image data may be received by the communication unit 216.

  Although the branch according to whether or not the stack projection state is in step S108 is described in FIG. 4 immediately after step S107 in FIG. 4, the branch does not necessarily have to be immediately after step S107. The case where the branch of step S108 is not immediately after step S107 will be described below.

  FIG. 8 is a flow chart showing a procedure of a modification of the presentation mode execution process of FIG. 4 in which the branch depending on whether or not the stack projection state in step S108 is immediately after step S103.

  Similar to the processing of FIG. 4, in the present embodiment, it is assumed that the projector 100 is set to be invalid and the projector 100 a is set to be valid in advance. Therefore, all the projectors 100 and 100a which constitute stack projection implement projection display of the projection images 104 and 104a and the markers 105 and 105a, respectively. However, if it is determined that the projector 100 is in the stack projection state, the projector 100 does not perform hand detection, command issuance, or the like. On the other hand, in the projector 100a, processing similar to the presentation mode execution processing of FIG. 8 described later is executed, but regardless of whether or not it is in the stack projection state, hand holding detection, command issue, etc.

  The flowchart of FIG. 8 is the same as the flowchart of FIG. 4 except for steps S103, S107, and S108. Therefore, only steps S103, S107, and S108 will be described below.

  At step S103, control unit 200 determines whether or not there is an instruction to end the presentation mode from the user. For example, the control unit 200 may pass this instruction via the operation unit 215 or the communication unit 216. If there is an end instruction, this processing ends. If there is no end instruction, the process proceeds to step S108.

  In step S108, based on the result of detection in step S100, the control unit 200 performs processing in steps S104 to S106 if it is not in the stack projection state, and the process proceeds to step S107. Otherwise, the process returns to step S103.

  At step S107, control unit 200 determines whether or not the hand is continuously detected at step S106. If it is detected that the continuation is detected, the process proceeds to step S109. Otherwise, the process returns to step S103.

  FIG. 9 is a flowchart showing a procedure of another modification of the presentation mode execution process of FIG. 4 in which the branch depending on whether or not the stack projection state in step S108 is immediately after step S101.

  Similar to the processing of FIG. 4, in the present embodiment, it is assumed that the projector 100 is set to be invalid and the projector 100 a is set to be valid in advance. Therefore, as in the process of FIG. 8, all the projectors 100 and 100a configuring the stack projection execute the projection display of the projection image 104 by all the projectors 100 and 100a. However, when it is determined that the projector 100 is in the stack projection state, the projector 100 does not perform projection display of the marker 105, detection of the hand, and issuance of a command. On the other hand, in the projector 100a, processing similar to the presentation mode execution processing of FIG. 9 described later is executed, but regardless of whether it is in the stack projection state, projection display of the marker 105, hand over detection, and command Issuance etc.

  The flowchart of FIG. 9 is the same as the flowchart of FIG. 4 except for steps S107, S108, S110, and S111. Therefore, only steps S107, S108, S110, and S111 will be described below.

  In step S108, based on the result detected in step S100, the control unit 200 performs processing in steps S102 to S106 if it is not in the stack projection state, and the process proceeds to step S107. Otherwise, the process proceeds to step S110.

  Regarding step S110, in the process of step S102 in FIG. 4, projection display of the marker 105 is not performed, and only projection display of the projection image 104 is performed. The details of the process other than the display of the marker 105 are the same as those in step S102 of FIG.

  At step S111, control unit 200 determines whether or not there is an instruction to end the presentation mode from the user. For example, the control unit 200 may pass this instruction via the operation unit 215 or the communication unit 216. If there is an end instruction, this processing ends. If there is no end instruction, the process proceeds to step S111.

  At step S107, control unit 200 determines whether or not the hand is continuously detected at step S106. If it is detected that the continuation is detected, the process proceeds to step S109. Otherwise, the process returns to step S103.

(Example 2)
The present invention can be applied to another example in which the first embodiment is modified. Since this embodiment has many points in common with the first embodiment, the description of the common parts will be omitted, and the differences from the first embodiment will be mainly described. In this embodiment, control of one projector constituting the stack projection realizes control of presentation modes of the other projectors constituting the stack projection.

<Overall configuration>
The entire configuration is as described with reference to FIG. 1 in the first embodiment.

<Detailed Configuration of Projector>
The configuration of a projector to which the present invention is applied is as described with reference to FIG. 2 in the first embodiment.

<Detailed configuration of PC>
The configuration of the PC 101 is as described with reference to FIG. 3 in the first embodiment.

<Basic operation of the projector>
The basic operation of the projector 100 is as described in the first embodiment.

<Characteristic operation of the projector>
Next, the procedure of the presentation mode execution process, which is a characteristic operation of the projector 100 according to this embodiment, will be described with reference to the flowchart of FIG. This process is performed by executing the program code read out from the ROM 202 by the control unit 200 of the projector 100, as in FIG.

  While the projector 100 is activated and performing projection display of the projection image 104 on the screen 103, when the control unit 200 receives a presentation mode start instruction via the operation unit 215 or the communication unit 216, the process shown in FIG. Is started. The projector 100 a is activated in the same manner as the projector 100, and performs projection display of the projection image 104 a in a state of being superimposed on the projection image 104 on the screen 103. That is, this presentation mode execution process is started in a state where stack projection configured by the projectors 100 and 100a is being performed.

  The projector 100a is connected to the projector 100 on the network via the communication unit 216a.

  The flowchart of FIG. 11 is the same as the flowchart of FIG. 4 of the first embodiment except for steps S112, S113, S114, and S115. Therefore, only steps S112, S113, S114, and S115 will be described below.

  First, in step S112, the control unit 200 detects a projector that cooperates during stack projection (hereinafter, referred to as "cooperation (stack) projector"). In the present embodiment, the control unit 200 detects this in response to an instruction of a cooperation (stack) projector simultaneously performed at the time of an instruction to start a presentation mode in a stack projection state from the user via the operation unit 215 or the communication unit 216. I do. This instruction is issued by a user operation on the OSD shown in FIG. Specifically, the user first selects “setting” from the OSD in FIG. 13A, and then selects “presentation mode (stack) (cooperation)” from the OSD in FIG. 13B. Next, the user selects the projector that he / she wants to cooperate in stack projection in the “cooperative projector selection” of the OSD in FIG. 13C by selecting the check box and selects “start” of the same OSD. As a result, the user instructs a projector that he / she wishes to cooperate in stack projection at the same time as instructing presentation mode start in the stack state. In the present embodiment, the control unit 200 not only detects the cooperation (stack) projector in step S112, but also detects whether or not the stack projection state is in step S100 according to the instruction.

  In addition, a list of projectors other than the projector 100 on the network is displayed in the “Selection of linked projector” of the OSD in FIG. 13C, and the user can uniquely recognize the projector detected on the network. is there. The OSD is not limited to the OSD shown in FIG. For example, it may be an OSD that allows the user to individually indicate the start of the presentation mode in the stack projection state and the instruction of the cooperation (stack) projector. Further, in the present embodiment, the user gives these instructions using the OSD, but the present invention is not limited to the OSD as long as it is a means capable of receiving a stack projection state and an instruction of the cooperation (stack) projector from the user. For example, a screen similar to the OSD in FIG. 13 may be displayed on the display unit connected to the video controller 306 of the PC 101, and the user may select an icon on the screen with a mouse connected to the USB controller 305b. Further, in the present embodiment, the detection of whether or not the stack projection state and the cooperation (stack) projector are detected based on the instruction content from the user, but if the method is capable of detecting these, the instruction from the user It is not limited to the method performed based on the content.

  In step S113, the control unit 200 proceeds to step S114 when a cooperative (stacked) projector is detected based on the result of detection in step S112. If not, the process proceeds to step S101.

  In step S114, the control unit 200 instructs the cooperation (stack) projector detected in step S112 via the communication unit 216 to start the presentation mode after invalidating the command issuing process. At the same time, the control unit 200 requests the cooperative (stacked) projector to perform at least one of the following via the communication unit 216: Specifically, the image generation based on the image data input to the cooperation (stack) projector and the projection display of the generated image on the projection surface of the cooperation (stack) projector are performed. Thereafter, after steps S101 to S107 are performed, the process proceeds to step S115.

  In step S115, the control unit 200 proceeds to step S109 when a cooperative (stacked) projector is detected based on the result detected in step S112. Otherwise, the process proceeds to step S108.

  In this manner, when performing the stack projection, the presenter 106 can start the presentation mode of the cooperation (stack) projector in synchronization with the start of the presentation mode of the projector 100. Furthermore, among the projectors constituting the stack projection, only the projector 100 issues the predetermined command, that is, a command such as slide feed to the PC 101, so that presentation as intended by the presenter 106 can be realized.

  Note that FIG. 11 describes the case where only the projector 100 that has detected the cooperative (stacked) projector in step S112 issues the predetermined command in step S109. However, in the present invention, the projector that issues a predetermined command in step S109 at the time of stack projection may not be the projector 100 that has detected the cooperative (stack) projector in step S112. For example, as in the modification of the process of FIG. 11 shown in FIG. 12, one of the detected cooperation (stack) projectors issues a predetermined command instead of the projector 100 detecting the cooperation (stack) projector at step S112. You may The flowchart of FIG. 12 is the same as the flowchart of FIG. 11 except step S116, which is performed when it is detected in step S107 that continuous detection is present, and step S117, which is performed instead of step S114. Therefore, only steps S116 and S117 will be described below.

  In step S116, the control unit 200 returns to step S103 when a cooperative (stacked) projector is detected based on the result of detection in step S112. Otherwise, the process proceeds to step S108.

  In step S117, control unit 200 instructs, via communication unit 216, one of the cooperation (stack) projectors detected in step S112 to start the presentation mode with the command issuance process enabled. Do. Furthermore, for the other cooperation (stack) projectors, the command issuance process is invalidated and the user is instructed to start the presentation mode. In addition, since the effective state is the default setting in the command issuing process of each cooperation (stack) projector, when there is only one cooperation (stack) projector detected in step S112, an instruction to start the presentation mode as it is . At this time, the control unit 200 also invalidates the command issuing process of the projector 100. At this time, as in step S114, the control unit 200 requests the cooperative (stacked) projector to perform at least one of the following via the communication unit 216: Specifically, the image generation based on the image data input to the cooperation projector and the projection display of the generated image on the projection surface of the cooperation projector are performed.

  Furthermore, the cooperative (stack) projector (in this case, the projector 100a), which keeps the command issuing process in the valid state, is requested to perform creation of a captured image of the projection surface including the projection image 104a. It also requests the detection of the presence or absence of the hand of the presenter 106 on the marker 105 a on the projection surface based on the captured image. Note that one implementation request may be made.

  The selection of the projector for keeping the command issuance process in the valid state which is the default setting may be any selection method as long as it is one cooperation (stack) projector detected in step S112. For example, the projector may be the projector initially selected as a cooperative (stacked) projector by the user in step S112. Further, in step S116, the linked (stacked) projector detected in step S112 may be displayed on the OSD as a list in a user-selectable manner, and the projector selected by the user may be selected.

  Note that, in step S114 of FIG. 11 and step S117 of FIG. 12, information on the image data arrangement and marker arrangement implemented in step S102 may be transmitted to each cooperation (stack) projector via the communication unit 216. As a result, it is possible to reliably make the arrangement of the image data and the arrangement of the markers to be projected and displayed on the screen 103 by the projectors constituting the stack projection the same. The information on the image data arrangement and the marker arrangement is specifically the scaling factor of the image data and the coordinate values of the image area 601 and the marker area 603, and is stored in the ROM 202 in advance.

[Other embodiments]
It goes without saying that the object of the present invention can also be achieved by supplying a storage medium storing program code of software that implements the functions of the above-described embodiments to the apparatus. At this time, a computer (or a CPU or an MPU) including the supplied control unit of the apparatus reads out and executes the program code stored in the storage medium.

  In this case, the program code itself read out from the storage medium realizes the functions of the above-described embodiments, and the program code itself and the storage medium storing the program code constitute the present invention.

  As a storage medium for supplying the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a non-volatile memory card, a ROM or the like can be used.

  Also, based on the instructions of the program code described above, an OS (a basic system or an operating system) or the like running on the device performs part or all of the processing, and the processing of the above-described embodiment is realized by the processing. It goes without saying that the case is included.

  Furthermore, even when the program code read out from the storage medium is written to the memory provided to the function expansion board inserted into the device or the function expansion unit connected to the computer, and the functions of the above-described embodiments are realized. It goes without saying that it is included. At this time, based on the instruction of the program code, a CPU or the like provided in the function expansion board or the function expansion unit performs part or all of the actual processing.

100, 100a Projector 101 PC
102, 102a video cable 103 screen 108, 108a control cable 200, 200a control unit 204, 204a image input unit 205, 205a image processing unit 213, 213a projection optical system 214, 214a camera 216, 216a communication unit 303 network controller

Claims (14)

A projection device,
An input unit for inputting image data of a predetermined page of a slide comprising a plurality of pages from an external device;
An image generation unit that generates a first image based on the input image data;
Projection means for projecting and displaying the first image on a projection surface;
Imaging means for imaging the projection surface on which the first image is projected and displayed to obtain a second image;
First, based on the second image, it is detected whether an indicator is present between the projection device and a specific area included in the first image projected and displayed on the projection surface. Detection means;
A stack projection state in which a third image generated based on the image data input from the external device by another projection device can be superimposed and displayed on the first image on the projection surface Determining means for determining whether or not
Whether to issue a slide page change command to the external device when the stack projection state is determined by the determination unit and the presence of the pointer is detected by the first detection unit is made valid or invalidated And a setting means for setting. Communication means for communicating with the other projection device;
And a selection means for selecting a projection device to be cooperated at the time of stack projection among the other projection devices based on a user operation.
The setting means is
The present invention is characterized in that issuance of the slide page change command to the external device by the projection device is enabled, and issuance of the slide page change command to the external device by the selected projection device is invalidated. The projection device according to 1. Communication means for communicating with the other projection device;
First selecting means for selecting, from among the other projectors, a projector associated with the stack projection based on a user operation;
And second selecting means for selecting one of the selected projectors,
The setting means is
The issuance of the slide page change command to the external device by the projection device selected by the second selection unit is enabled, and the projection device selected by the other first selection unit and the projection device The projection apparatus according to claim 1, wherein issuance of the slide page change command to an external apparatus is disabled.   The projection apparatus according to any one of claims 1 to 3, wherein the projection unit further projects and displays a predetermined pattern on the specific area of the first image. Display means for displaying on the projection surface an OSD enabling user selection of projection display and non-projection display of the predetermined pattern on the specific area of the first image;
The projection unit displays and projects the predetermined pattern on the specific area of the first image when there is a user selection of projection display of the predetermined pattern in the OSD. 4. The projection device according to 4. The imaging means has an imaging optical axis different from the projection optical axis of the projection means,
The first detection means detects the presence of the indicator when a change in luminance is detected in the specific area of the second image. The projection device according to any one of the preceding claims.   7. The projection apparatus according to claim 6, wherein the first detection means detects the presence of the indicator when a decrease in luminance is detected in the specific area of the second image. .   5. The projection apparatus according to claim 4, wherein the first detection means detects the presence of the pointer when a change in the position of the predetermined pattern of the second image is detected. .   When it is set that the issuance of the slide page change command to the external device is enabled by the setting unit, the external unit is operated when the detection time of the indicator by the first detection unit is equal to or longer than a predetermined time. The projection apparatus according to any one of claims 1 to 8, wherein the slide page change command is issued to the apparatus.   When it is set by the setting means that issuance of the slide page change command to the external device is enabled, detection of the indicator by the first detection means becomes a predetermined time or more, and then within a predetermined time The projection apparatus according to any one of claims 1 to 8, wherein the slide page change command is issued to the external apparatus when it is not detected.   At least one of image generation based on the image data input from the external device, and projection display of the generated image on the projection surface, with respect to a projection device that cooperates during the stack projection. The projection apparatus according to claim 2 or 3, wherein it is required.   An image of the projection surface on which an image generated based on the image data input from the external device is projected and displayed on the projection device selected by the second selection unit, and the image is captured Based on the image, detection of whether or not the pointer exists between the projection device selected by the second selection unit and the specific area included in the image projected and displayed on the projection surface 4. A projection device according to claim 3, characterized in that it requires at least one implementation of. A control method of the projection apparatus,
An input step of inputting image data of a predetermined page of a slide comprising a plurality of pages from an external device;
An image generation step of generating a first image based on the input image data;
A projection step of projecting and displaying the first image on a projection surface;
An imaging step of imaging the projection surface on which the first image is projected and displayed to obtain a second image;
First, based on the second image, it is detected whether an indicator is present between the projection device and a specific area included in the first image projected and displayed on the projection surface. Detection step,
Is it a stack projection state in which a third image generated based on the image data input from the external device by another projection device can be projected and displayed superimposed on the first image on the projection surface? A determination step of determining whether or not
Whether issuance of a slide page change command to the external device is determined to be valid or invalid when it is determined in the determination step that the stack projection state and the presence of the pointer is detected in the first detection step And a setting step of setting a control method.   A program which executes the control method according to claim 13.

Images