JP2016015626A - Image projection apparatus and image projection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an operator to view an image in an accurate display direction when the operator performs a menu operation in an image projection device capable of changing the display direction of a projection image, thereby enhancing the operability.SOLUTION: A projector has a remote controller 20 having an imaging part 21 for imaging a projection image projected onto a screen, a camera video signal input processor 25 for detecting a display direction determining pattern representing a display direction of the projection image from a pickup image, a display direction determining part 26 for determining the display direction of the projection image from the detected display direction determining pattern, and a remote control part 23 for specifying the display direction of the projection image at the display time of a superposition frame from the display direction of the projection image, pattern embedding means for embedding the display direction determining pattern in the projection image, and image projection means for projecting a projection image containing the superposition frame superimposed on the projection image in the display direction based on the specification of the display direction from the remote control part 23.

Description

  The present invention relates to an image projection apparatus and an image projection method. More specifically, the present invention relates to a function for displaying a menu screen superimposed on a projected image.

  Projectors widely known as image projectors are widely used for presentations, conferences, signage, etc. for large numbers of people, as well as higher resolution of liquid crystal panels, improved brightness as lamps become more efficient, and lower cost. Etc. are progressing. In addition, compact and lightweight image projectors using DMD (Digital Micro-mirror Device) have become widespread, and these image projectors are widely used not only in offices and schools but also at home.

  In general, a projector is a menu screen (also called a menu display) that can request various operations and settings for an image projection apparatus on a projection image that is input from a connected video supply device such as a personal computer and projected onto a screen (projection surface). On-screen display (hereinafter referred to as OSD) function for projecting on a screen.

  On the menu screen displayed by the OSD function, for example, various settings such as a setting language, a display mode, image adjustment, power supply setting, and the like can be performed, and a user can request a desired operation.

  By the way, as a projection method of the projector, in addition to a projection method of projecting from the front side of the screen to the reflective screen (referred to as front projection), the back side of the screen (projector installation side) with respect to the transmissive screen A projection method (referred to as rear projection) is known in which an image is displayed on the front side of the screen (projector non-installation side) by projecting from the screen.

  In the case of projection by rear projection, the image is inverted and projected so that the viewer on the front side of the screen can see the image in the correct direction across the transmissive screen from the projector. .

  As described above, a technique is known in which a viewer can view an image in a correct direction by changing a display direction of a projection image depending on an installation state of the projector.

  In this regard, Patent Document 1 includes a display direction designation key on the operation panel of the main body and the remote control, and the operator directly instructs the upside down and left side inversion of the projected image by operating the display direction designation key. Thus, a projector capable of changing the display direction of an image in a manner that can be performed is disclosed.

  In an image projection apparatus that can change the display direction of a projection image according to the installation state, such as Patent Document 1, it is possible to set the display direction of a projection image from a menu screen that is superimposed, For example, when a menu screen is displayed from the back side of the screen during rear projection using a transmissive screen, the image that can be seen by the operator on the back side of the screen is displayed inverted, so the menu screen It becomes difficult to recognize the display content.

  In this case, when menu operation using the direction key is performed on the menu screen, it is difficult to recognize the direction to be instantly specified because the operation is performed on the highlighted menu screen. .

  For this reason, when performing image quality adjustment from the menu screen, it is necessary to perform the menu operation in a situation where the above operations are difficult and to change the display direction of the projected image, and then perform the operation for image quality adjustment. There is a problem that the operator's desired operation cannot be smoothly performed.

  Further, it is complicated to operate the display direction designation key to instruct to flip the projection image upside down or horizontally.

  Therefore, the present invention adjusts the display direction of the projected image at the time of menu operation according to the position of the operator to the direction of the operator so that the operator can visually recognize the image in the correct display direction when performing the menu operation. An object of the present invention is to provide an image projection apparatus that can smoothly perform an operation desired by an operator.

  In order to achieve this object, an image projection apparatus according to the present invention includes an imaging unit that captures a projection image projected on a projection surface, and a display that indicates a display direction of the projection image from the captured image captured by the imaging unit. A pattern detection unit that detects a direction determination pattern, a display direction determination unit that determines a display direction of a projection image from the display direction determination pattern detected by the pattern detection unit, and a projection image that is determined by the display direction determination unit A remote operation means for designating the display direction of the projected image when displaying the superimposed screen from the display direction of the display, a pattern embedding means for embedding the display direction determination pattern in the projected image, and the remote Image projection means for projecting a projection image obtained by superimposing a superimposed screen on a projection image in a display direction according to the designation of the display direction from the direction instruction section of the operation means. A.

  According to the present invention, in an image projection apparatus capable of changing the display direction of a projected image, it is possible to improve the operability by allowing an operator to visually recognize an image in the correct display direction when performing a menu operation. it can.

It is a block diagram which shows the structure of an image projector. It is explanatory drawing of the synchronizing signal and projection signal according to rotation of the color wheel at the time of the projection of an image. It is explanatory drawing of the pattern image of the display direction determination pattern embedded in a projection image. It is explanatory drawing which shows a mode that a user exists in the front side and back side of a transmissive screen at the time of rear projection. It is explanatory drawing of (A) projection image seen from the front side of the screen, (B) display direction determination pattern, (C) projection image seen from the back side of the screen, and (D) display direction determination pattern. It is an external view of a remote control. It is a block diagram which shows the structure of a remote control. It is an example of a list of key codes. It is a sequence diagram of a menu display process at the time of operation of the remote control. 5A is a flowchart of menu display processing from the main body operation unit, and FIG. 5B is a flowchart of menu display end processing from the main body operation unit. It is explanatory drawing about the appearance at the time of the projection image by the position which sees a projection screen at the time of rear projection, and a menu display. It is a block diagram which shows the structure of the remote control provided with the angle sensor. (A) is explanatory drawing which shows the mode of operation in the state in which there is no inclination of a remote control, (B) is explanatory drawing which shows the mode of operation in the state where the remote control inclines.

  Hereinafter, a configuration according to the present invention will be described in detail based on the embodiment shown in FIGS.

[First Embodiment]
An image projection apparatus (projector 100) according to the present embodiment is a projection image obtained from an imaging unit (imaging unit 21) that captures a projection image projected on a projection surface (screen 200), and a captured image captured by the imaging unit. A pattern detection unit (camera video signal input processing unit 25) for detecting a display direction determination pattern indicating the display direction of the image, and a display direction for determining the display direction of the projection image from the display direction determination pattern detected by the pattern detection unit A determination unit (display direction determination unit 26), and a direction instruction unit (remote control unit 23) for designating the display direction of the projection image when displaying the superimposed screen from the display direction of the projection image determined by the display direction determination unit Remote control means (remote control 20), pattern embedding means (system control unit 3) for embedding a display direction determination pattern in the projection image, and remote control means In display direction in accordance with the display direction of the specified from direction instruction section, in which includes an image projection means for projecting a projection image obtained by superimposing the superimposed screen projected image (the system control unit 3), the. In addition, the code | symbol in embodiment and the example of application are shown in a parenthesis.

(Configuration of image projector)
FIG. 1 is a block diagram showing a configuration of a projector 100 which is an embodiment of an image projection apparatus according to the present invention.

  The projector 100 includes a video signal control unit 1, a remote control reception unit 2, a system control unit 3, a memory 4, an input terminal 5, a main body operation unit 6, a fan control unit 7, a fan 8, a DMD control unit 9, and a color wheel control unit 10. The image projection apparatus includes a rotation detection unit 11, a lamp control unit 12, a projection lens 13, a DMD 14, a color wheel 15, and a lamp 16, and projects an image on a screen 200. Moreover, the remote control 20 as a remote control means is provided.

  The system control unit 3 performs overall control of the projector 100. Also, image processing such as scaling processing for the input video signal, processing for embedding a display direction determination pattern (described later) in the projection image at a predetermined timing (pattern embedding means), and menu screen in the projection image Is performed (image projection means), a process for changing the display direction of the projected image (image projection means), and other various controls. Also connected to the video signal control unit 1, remote control receiving unit 2, memory 4, main body operation unit 6, fan control unit 7, DMD control unit 9, color wheel control unit 10, rotation detection unit 11, and lamp control unit 12. And controls each of these functional units.

  The input terminal 5 is an interface for inputting a video signal, and is a VGA (Video Graphics Array) input terminal such as a D-Sub connector, an HDMI (High-Definition Multimedia Interface) (registered trademark) terminal, an S-VIDEO terminal, an RCA. Video input terminals such as terminals. A video signal is received from a video supply device such as a computer or AV equipment via a cable connected to the input terminal 5. In some cases, a plurality of input terminals 5 may be provided.

  The video signal control unit 1 processes the video signal input to the input terminal 5, and performs various processes such as serial-parallel conversion and voltage level conversion on the video signal. It also has a signal determination function that analyzes the resolution and frequency of the video signal.

  The memory 4 stores data in image processing and other various processing on the video signal. In addition, a display direction determination pattern is stored. As the memory 4, for example, a nonvolatile semiconductor memory such as an EPROM, an EEPROM, or a flash memory can be employed.

  The main body operation unit 6 is an interface for operating the projector 100 and accepts various operation requests from the user. When accepting the operation request, the main body operation unit 6 notifies the system control unit 3 of the operation request. The main body operation unit 6 includes operation keys (operation buttons) provided on the outer surface of the projector 100.

  The remote control receiver 2 receives an operation signal from the remote controller 20. When receiving the operation signal, the remote control receiving unit 2 notifies the system control unit 3 of the operation signal.

  The user can perform various settings by operating the main body operation unit 6 or the remote controller 20. For example, a display instruction for a menu screen, a request to change the aspect ratio of the projected image, a request to turn off the projector 100, a request to change the lamp power to change the light quantity of the light source, and the image quality (high brightness, standard, natural, etc.) of the projected image A video mode change request to change, a freeze request to stop the projected image, and the like can be executed.

  The fan 8 includes an intake fan, an exhaust fan, a cooling fan, and the like. By discharging the outside air sucked from the intake fan from the exhaust fan, an air flow is generated in the projector 100 and air cooling is performed. A cooling fan as a light source cooling means is provided in the vicinity of the lamp 16.

  The fan control unit 7 controls the fan 8 so that the temperature in the projector 100 and the temperature of the lamp 16 become a predetermined temperature.

  The lamp 16 as a light source is, for example, a high-pressure mercury lamp that emits light from a luminescent substance by a discharge between a pair of electrodes. The lamp control unit 12 controls on / off of the lamp 16 and lighting power.

  The light emitted from the lamp 16 is split into light that repeats each color every unit time by the disk-shaped color wheel 15.

  The color wheel control unit 10 controls the rotational drive of the color wheel 15. The rotation detection unit 11 detects the rotation state of the color wheel 15.

  The light emitted from the color wheel 15 is condensed on a DMD 14 as an image display element via a light tunnel (not shown) and an illumination optical system (relay lens, plane mirror, and concave mirror).

  The DMD 14 has a substantially rectangular mirror surface composed of a plurality of micromirrors, and each micromirror is driven in a time-sharing manner based on video data, thereby processing and reflecting the projection light so as to form a predetermined video. This is an image display element. Further, the DMD control unit 9 controls on / off of the micromirror of the DMD 14.

  Based on the video data in a time division manner, the DMD 14 reflects light used by the plurality of micromirrors to the projection lens 13 and discards light to the OFF light plate. The light to be used is reflected to the projection lens 13, and the image light magnified through the projection lens 13 is magnified and projected onto the screen 200.

(Display direction judgment pattern)
Next, a display direction determination pattern embedded in a projection image projected by the projector 100 will be described.

  FIG. 2 shows an example of a synchronization signal and a projection signal corresponding to the rotation of the color wheel 15 (CW) during image projection. Note that FIG. 2B is an explanatory diagram of the encircled portion of FIG.

  In this embodiment, the color wheel 15 includes 7 segments (divided areas) of Cy (cyan) -W (white) -R (red) -M (magenta) -Y (yellow) -G (green) -B (blue). ) And an index (Index) is set between Cy and W.

  For this reason, as shown in FIG. 2, every time the color wheel 15 rotates, the synchronization signal (CW synchronization signal) generated from the Index enters immediately before the W section.

  When the CW synchronization signal is detected, the W section immediately after is detected as an off period, the projection signal is not output, and the display direction determination pattern is output for t2 hours after a predetermined t1 time has elapsed. In this way, by embedding the display direction determination pattern signal in the W section, it is possible to project the display direction determination pattern only for an instant section that is invisible to human eyes.

  Here, since it is likely that the brightness of the projected image becomes dark if embedded in the W section of each rotation, for example, once in n rotations (in the example of FIG. 2, once in 2 rotations, n is 2). It is also preferable to embed the above natural number) to minimize the influence on the brightness of the projected image.

  FIG. 3 is an example of a pattern image of a display direction determination pattern embedded in a projection image. This display direction determination pattern is a pattern image in which different numbers of dots are arranged in the vertical and horizontal directions.

  In this display direction determination pattern, the direction can be determined based on the number of dots. For example, when it looks like FIG. 3, it can be determined that the display direction is normal. Further, if 3 dots appear on the left side and 4 dots appear on the right side, it can be determined that the image appears to be reversed left and right. Similarly, it is possible to determine in which direction the projected image is viewed based on how the upper, lower, left, and right dots are viewed.

  The display direction determination pattern shown in FIG. 3 is an example, and is not particularly limited as long as the display direction (up / down / left / right) can be determined.

(Rear projection)
With reference to FIGS. 4 and 5, how the projected image and the display direction determination pattern appear according to the position of viewing the projection screen during rear projection will be described.

  FIG. 4 is an explanatory diagram showing a state in which the user 300a is on the front side of the transmissive screen 200 and the user 300b is on the back side of the screen 200 (the arrangement side of the projector 100) during rear projection.

  Since it is rear projection, when the projection image is viewed from the position of the user 300a, it is projected so as to be viewed in the normal direction as shown in FIG. At this time, the projected display direction determination pattern is also projected as shown in FIG. 5B and can be seen in the normal direction (same as in FIG. 3).

  On the other hand, when the projection image is viewed from the position of the user 300b, it is seen in a state where it is horizontally reversed as shown in FIG. At this time, the projected display direction determination pattern is also projected in a horizontally reversed state as shown in FIG. 5D, and it can be seen that the display direction appears to be horizontally reversed. 4 and 5 describe the case where the projector 100 is normally installed and projected, but the appearance of the projected image is the same when rear-projecting by a ceiling-mounted installation or the like.

  The projector 100 according to the present embodiment determines the display direction of the projection image based on the appearance of the display direction determination pattern, and projects the image so that it can be viewed in the normal direction from the position of the operating user when the user operates the menu. To do.

(Remote operation means)
Next, the configuration of the remote controller 20 as a remote control means provided in the projector 100 will be described. FIG. 6 is an external view of the remote controller 20. The remote controller 20 includes operation keys such as a [menu] key, a [direction] key, a [power] key, and a [decision] key as the remote control operation unit 24 for instructing the projector 100 to perform various operations.

  In addition, the remote controller 20 includes an imaging unit 21 that captures a projection image projected on the screen 200 by the projector 100, and a signal transmission unit 22 that transmits information to the projector 100.

  The signal transmission unit 22 transmits an operation signal (key code) based on the operation content instructed by the remote control operation unit 24 to the projector 100 by infrared communication, thereby enabling the projector 100 to be operated remotely. Note that the transmission of the operation signal from the remote controller 20 is not limited to infrared communication, and other communication methods may be used.

  FIG. 7 is a block diagram showing the configuration of the remote controller 20. The remote control 20 includes an imaging unit 21, a signal transmission unit 22, a remote control control unit 23, a remote control operation unit 24, a camera video signal input processing unit 25, and a display direction determination unit 26.

  The remote controller control unit 23 is a control unit that controls the entire remote controller 20 and controls the above-described units. The key pressed by the remote control operation unit 24 is sent to the remote control unit 23.

  The camera video signal input processing unit 25 is a pattern detection unit that receives a projection image captured by the imaging unit 21 and detects a display direction determination pattern included in the projection image.

  The display direction determination unit 26 receives the display direction determination pattern detected by the camera video signal input processing unit 25, determines the direction of the display direction determination pattern, and determines the display direction of the projection image. Thereby, it is determined in what direction the projected image viewed from the imaging unit 21, that is, the direction in which the projected image is viewed from the user operating the remote controller 20.

  The remote control control unit 23 determines a key code based on the pressed key input from the remote control operation unit 24 and the display direction of the projection image determined by the display direction determination unit 26, and obtains a vendor code and the like. It functions as a direction instruction unit that transmits the assigned packet from the signal transmission unit 22 to the projector 100.

  A list of key codes determined by the remote controller control unit 23 of the remote controller 20 is shown in FIG. The key code is determined by a combination of the pressed key and the determined display direction of the projected image.

  For example, when the display unit determination pattern shown in FIG. 5B is recognized by the imaging unit 21 when the [Menu] key of the remote controller 20 is pressed, the projected image looks normal (normal) Direction), the display direction at the time of menu display can be left as it is. FIG. 8 shows that 0x11 is applied as the key code at this time. That is, the projector 100 that has received the key code 0x11 projects the menu screen without inversion.

  Further, for example, when the display direction determination pattern shown in FIG. 5D is recognized by the imaging unit 21 when the [Menu] key of the remote controller 20 is pressed, the projected image is viewed as horizontally reversed. Therefore, the display direction at the time of menu display is reversed and displayed. FIG. 8 shows that [0x21] is applied as the key code at this time. In other words, the projector 100 that has received the key code [0x21] projects the projected image including the menu screen by reversing the left and right.

  This key code is set for each key of the remote control operation unit 24. For a menu screen that needs to be displayed by pressing a key, such as a [menu] key or an [input] key, for each determined display direction. The key code is different. On the other hand, since it is not necessary to change the key code depending on the display direction for items such as the [Enter] key and [Direction] key that do not require the menu screen to be displayed by pressing the key, a single key code is provided for each key. Yes.

(Menu display during remote control operation)
A menu display process when operating the remote controller 20 will be described. FIG. 9 is a sequence diagram of menu display processing when the remote controller 20 is operated.

  FIG. 9 shows a process from when the [menu] key is pressed by the user 300 from the remote controller 20 until the menu screen is displayed, and a process from when the [return] key is pressed until the display of the menu screen ends. Is shown.

  When the [Menu] key of the remote controller 20 is pressed by the user 300 while the image is projected by the projector 100 (S101), the remote controller control unit 23 of the remote controller 20 detects the pressing of the [Menu] key and takes an image. The unit 21 is controlled to capture a projection image (S102).

  Next, the camera video signal input processing unit 25 of the remote controller 20 detects a display direction determination pattern from the photographed projection image, and the display direction determination unit 26 determines the direction of the display direction determination pattern and determines the direction of the projection image. The display direction is determined (S103).

  The remote controller 23 determines a key code based on the type of pressed key and the determined display direction, and transmits this key code from the signal transmitter 22 to the projector 100 (S104).

  The projector 100 identifies the display direction of the menu screen based on the received key code, and projects the menu screen superimposed on the projection image in this display direction (S105). That is, the display direction of the original projection image is also the same as the display direction of the menu screen. At this time, the original display direction of the projection image before the menu display is stored.

  Through the processing so far, the user 300 can view the projected image including the menu screen in the normal direction.

  When the user's desired operation is completed and the [Return] key of the remote controller 20 is pressed by the user 300 (S106), the corresponding key code is transmitted from the signal transmission unit 22 to the projector 100 (S107). A single key code is set for the [Return] key. Note that pressing the [Return] key terminates the display of the menu screen, and it is not necessary to determine the shooting and display direction. Therefore, the remote control unit 23 simply performs a process of transmitting the corresponding key code.

  Based on the received key code, the projector 100 ends the superimposed display of the menu screen and projects the projection image in the original display direction stored in S105 (S108).

  Through the processing so far, when the user 300 finishes the operation on the menu screen, the projected image returns to the original display direction. Note that the keys of the remote controller 20 for erasing the menu display are not limited to the [RETURN] key, but include all keys assigned to exit the menu and erase the menu display. The same process is performed not only when a predetermined key is pressed, but also when the menu is exited and the menu display disappears (timeout) if there is no operation from the menu display for a certain period of time. It returns to the display direction.

(Menu display when using the control panel)
Processing at the time of operation on the main body operation unit 6 of the projector 100 will be described. 10A is a flowchart of the menu display process when operated from the main body operation unit 6, and FIG. 10B is a flowchart of the menu display end process when operated from the main body operation unit 6.

  When the [Menu] key of the main body operation unit 6 is pressed during image projection, the system control unit 3 stores the current display direction (S201).

  Next, the menu screen is superimposed on the projection image, and the image is projected in the display direction in the normal front projection (S202).

  When the user operates the main body operation unit 6 of the projector 100, the user 300b who operates the keys is always on the projector side as shown in FIG. Can be viewed in the normal direction.

  Further, when the menu screen display is turned off, the processing is the same as when the remote control is operated. That is, when the key for deleting the menu screen display is pressed from the main body operation unit 6 (S301: Yes), the menu display is deleted and the image is projected in the original orientation stored in S201 (S303).

  Also, when the key is not pressed (S301: No) and no operation is performed for a predetermined time (timeout, S302: Yes), the menu display is similarly erased and the image is projected in the original direction (S303). ). With the above processing, when the user 300 finishes the operation, the projection image returns to the original display direction.

  FIG. 11 is a diagram for explaining how the projected image looks at the position where the projected screen is viewed and the projected image when the menu is displayed during rear projection.

  With the above-described processing, during rear projection, as shown in FIG. 11A, when the menu display operation is performed on the projection screen viewed from the position of the user 300a in FIG. 4, the menu screen is normally displayed. Is done.

  Further, at the time of rear projection, as shown in FIG. 11B, a projected image in a state where the left and right are reversed is seen from the position of the user 300b in FIG. 4, but when a menu display operation is performed from this state Since the projected image including the menu screen is displayed in the correct orientation, the user 300b can perform a desired operation smoothly. In addition, when the operation is finished and the menu display is closed, the display direction of the projection image is returned to the original, so that it is not necessary for the user 300b to perform the process of returning the display direction when the operation is ended.

  According to the image projection apparatus according to the present embodiment described above, regardless of the setting of the display direction of the projection image depending on the installation state of the projector, the positional relationship between the operator and the projector is grasped when displaying the menu of the projector. When the menu is displayed, it is possible to display an image by matching the display direction with the direction of the operator depending on the position of the operator. Therefore, the operator can visually recognize the image in the correct display direction when performing the menu operation, can perform the desired operation smoothly, and does not need to operate the display direction designation key. Operability can be improved.

[Second Embodiment]
Hereinafter, other embodiments of the image projection apparatus according to the present invention will be described. In addition, description about the same point as the said embodiment is abbreviate | omitted suitably.

  FIG. 12 is a block diagram showing the configuration of the remote controller 20. FIG. 13A is an explanatory diagram showing an operation state when the remote controller 20 is not tilted, and FIG. 13B is an explanatory diagram showing an operation state when the remote controller 20 is tilted.

  In the present embodiment, the remote controller 20 includes an imaging unit 21, a signal transmission unit 22, a remote control unit 23, a remote control operation unit 24, a camera video signal input processing unit 25, a display direction determination unit 26, and an angle sensor. 27.

  In the present embodiment, the remote controller 20 includes an angle sensor 27 as an inclination detection unit that detects the inclination of the remote control itself. When the display direction determination unit 26 determines the direction in which the projected image is viewed, the direction of the display direction determination pattern and the inclination of the remote control 20 itself are determined based on the detection result of the angle sensor 27. The display direction is determined after the determination and the inclination of the remote controller 20 itself is corrected with respect to the projection image captured by the imaging unit 21.

  That is, in the state shown in FIG. 13A, since the angle sensor 27 does not detect the inclination, the direction of the display direction determination pattern is the display direction of the image projected from the projector 100 as it is. As shown in (B), when the remote controller 20 is tilted, the display direction of the image cannot be determined only by the orientation of the captured display direction determination pattern. Therefore, the correct display direction can be determined by determining the tilt of the remote controller 20 based on the detection result of the tilt angle of the angle sensor 27. Although FIG. 13B shows a state where the remote controller 20 is tilted vertically, it can also be detected when the remote controller 20 is tilted obliquely or when the front and back sides are reversed.

  In the image projection apparatus according to the present embodiment, it is possible to correctly determine the display direction of the projected image even when the remote control 20 is operated in a tilted state when operated from the remote control 20.

  The above-described embodiment is a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention.

1 Video signal control unit 2 Remote control reception unit 3 System control unit (pattern embedding means, image projection means)
4 Memory 5 Input terminal 6 Main body operation unit 7 Fan control unit 8 Fan 9 DMD control unit 10 Color wheel control unit 11 Rotation detection unit 12 Lamp control unit 13 Projection lens 14 DMD
15 Color wheel 16 Lamp 20 Remote control (remote control means)
21 Image pickup unit 22 Signal transmission unit 23 Remote control unit 24 Remote control operation unit 25 Camera video signal input processing unit (pattern detection unit)
26 Display direction determination unit 27 Angle sensor (tilt detection unit)
100 Projector (image projection device)
200 screen (projection surface)
300, 300a, 300b users

JP 2007-225859 A

Claims (8)

An imaging unit that captures a projection image projected on the projection surface;
A pattern detection unit that detects a display direction determination pattern indicating a display direction of a projection image from a captured image captured by the imaging unit;
A display direction determination unit that determines a display direction of a projection image from the display direction determination pattern detected by the pattern detection unit;
A remote control means comprising: a direction instructing unit for designating a display direction of the projection image at the time of display of the superimposed screen from the display direction of the projection image determined by the display direction determination unit;
Pattern embedding means for embedding the display direction determining pattern in the projected image;
Image projection means for projecting a projection image in which a superimposed image is superimposed on a projection image in a display direction in accordance with designation of a display direction from the direction instruction section of the remote operation means;
An image projection apparatus comprising: The remote control means has a plurality of operation keys,
The image projection apparatus according to claim 1, wherein when the operation key corresponding to the operation for displaying the superimposed screen among the operation keys is detected, the imaging unit performs imaging. The remote operation means has an inclination detection unit for detecting the inclination of the remote operation means,
The display direction determination unit determines a display direction of a projection image from a detection result of the tilt detection unit and the display direction determination pattern detected by the pattern detection unit. 3. The image projection apparatus according to 2. The image projecting means stores a display direction of a projection image before projecting a projection image in which a superimposed screen is superimposed on the projection image in a display direction according to the designation of the display direction from the direction instruction unit,
The image projection apparatus according to claim 1, wherein after the display of the superimposed screen is finished, the projection image is projected in the original display direction. A light source that emits light;
An image display element for forming an image;
A color wheel that is disposed on an optical path from the light source to the image display element, has at least a white divided region, and spectrally separates light while being rotated,
5. The image projection apparatus according to claim 1, wherein the pattern embedding unit embeds the display direction determination pattern at a timing corresponding to the white divided region of the color wheel.   6. The image projection apparatus according to claim 5, wherein the pattern embedding unit embeds the display direction determination pattern once in n rotations (n is a natural number of 2 or more) of the color wheel.   7. The image projection according to claim 1, wherein the display direction determination pattern is a pattern image in which different numbers of dots are arranged in each of the upper, lower, left, and right directions. apparatus. Remote operation means for remotely operating the image projection device;
Pattern embedding means for embedding a display direction determination pattern indicating the display direction of the projection image in the projection image;
An image projecting method of an image projecting apparatus comprising: an image projecting unit that projects a projected image obtained by superimposing a superimposed screen on a projected image,
When an operation for displaying a superimposed screen is performed from the remote control means,
The remote control means includes
Processing to capture a projection image projected on the projection surface;
A pattern detection process for detecting the display direction determination pattern from the captured image;
Display direction determination processing for determining the display direction of the projection image from the detected display direction determination pattern;
From the determined display direction of the projected image, a direction instruction process for designating the display direction of the projected image when displaying the superimposed screen is performed.
The image projecting means includes
An image projection method, wherein a projection image in which a superimposed image is superimposed on a projection image is projected in a display direction in accordance with a display direction designation from the remote control means.