JP2013054010A - Position detecting device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily obtain detailed position information regardless of presence/absence of a building around or a layout change.SOLUTION: A position detection device stores a display image displayed by a display device which displays the display image at a prescribed view angle, and positional information indicating a position in the view angle direction at which the display image is displayed by the preset display device in association with each other, receives input of a photographed image obtained by photographing the display image displayed by the display device, and reads out positional information associated with the display image contained in the input photographed image.

Description

  The present invention relates to a technique for acquiring position information.

  A GPS (Global Positioning System) is known as means for acquiring position information of electronic devices and the like. Alternatively, Patent Literature 1 describes that, for example, a plurality of wireless terminals that perform communication such as a wireless local area network (LAN) are arranged and position information is calculated from the wireless strength of these beacon signals.

JP 2008-131301 A

  However, with GPS, there is a problem in that radio signals from GPS satellites cannot be accurately received in places where buildings are present indoors, underground, and in the vicinity, and position accuracy is lowered. In the calculation of the position information according to Patent Document 1, since the wireless strength changes according to changes in the position (layout) of surrounding objects, there is a problem that different positions are calculated according to such changes.

  The present invention has been made in view of such a situation, and provides a position detection device and a program for acquiring position information.

  In order to solve the above-described problems, the present invention provides a display image displayed by a display device that displays a display image at a predetermined viewing angle, and a viewing angle direction in which the display image is displayed by a display device installed in advance. A position information storage unit in which position information indicating a position is stored in association with each other, an input unit that receives an input of a captured image obtained by capturing a display image displayed by the display device, and an image that is input to the input unit A position detection device comprising: a position information detection unit that reads position information associated with a display image included in an image from a position information storage unit.

  Further, the present invention includes a display image displayed by a display device that displays a display image at a predetermined viewing angle, and position information indicating a position in a viewing angle direction where the display image is displayed by a display device installed in advance. A position information storage unit stored in association with each other, an input unit that receives an input of a captured image obtained by capturing a display image displayed by the display device, and a display image included in the captured image input to the input unit A step of imaging a display image displayed by the display device on a computer of an imaging device connected to the position detection device, comprising: a location information detection unit that reads the associated location information from the location information storage unit; And a step of transmitting the captured image to the position detection device.

  As described above, according to the present invention, position information can be acquired.

It is a block diagram which shows the structural example of the position detection system by one Embodiment of this invention. It is a figure which shows the 1st example of a display screen of the display apparatus by one Embodiment of this invention. It is a figure which shows the 2nd example of a display screen of the display apparatus by one Embodiment of this invention. It is a figure which shows the positional relationship of the display apparatus and portable terminal by one Embodiment of this invention. It is a figure which shows typically the lenticular display by one Embodiment of this invention. It is a figure which shows the positional relationship of the display apparatus and portable terminal which display a some display image by one Embodiment of this invention toward a different viewing angle direction. It is a figure which shows the example of a data of the positional infomation memorize | stored in the positional infomation storage part by one Embodiment of this invention. It is a flowchart explaining the operation example of the portable terminal by one Embodiment of this invention. It is a flowchart explaining the operation example of the position detection apparatus by one Embodiment of this invention. It is a block diagram which shows the structural example of the position detection system by one Embodiment of this invention. It is a figure which shows the example of data memorize | stored by matching the positional information according to time in the positional information storage part by one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a position detection system 1 according to the present embodiment. The position detection system 1 includes a display device 10-1, a display device 10-2,..., A mobile terminal 20, and a position detection device 30, and these computer devices are connected via a network 5. Connected. Since the display device 10-1, the display device 10-2,... Have the same configuration, the display device 10 will be described unless otherwise distinguished. However, although a plurality of display devices 10 are shown and described here, the number of display devices 10 may be one. Here, one mobile terminal 20 and one position detection device 30 are shown and described, but a plurality of mobile terminals 20 and a plurality of position detection devices 30 may be provided.

  The network 5 is a wired or wireless network that connects the plurality of display devices 10, the mobile terminal 20, and the position detection device 30. For example, the network 5 is configured by a wireless network that connects the mobile terminal 20 and the position detection device 30, a network such as the Internet that connects the display device 10 and the position detection device 30, and the like.

  The display device 10 is a display that displays a predetermined display image. For example, a computer device called a digital signage (electronic signage) that displays advertisement information such as an advertisement image or an advertisement moving image can be applied to the display device 10. In the present embodiment, the display device 10 includes communication means, receives a display image via the network 5, stores it in its own storage area, and displays the stored display image. For example, the display device 10 receives in advance information associated with a plurality of display images and display times for displaying the display images from the position detection device 30 connected via the network 5, and stores the information. Store in the area. When the display device 10 compares the current time acquired from the timekeeping function provided by the display device 10 with the display time associated with the display image and determines that the current time exceeds the display time, the display device reads and displays the display image. However, when the display device 10 receives the display image from the position detection device 30, the display device 10 may display the display image immediately.

  FIG. 2 is a diagram illustrating an example of a screen on which the display device 10 displays a display image. In the display image, information such as an advertisement (here, the character “1”) is displayed, and an identification image for identifying the display image is displayed on a part of the screen. In this example, a two-dimensional barcode as an identification image is displayed at a lower left portion of the screen (see symbol a). The two-dimensional barcode includes an image ID (Identifier) that identifies the display image. By detecting the image ID from such a two-dimensional barcode, the display image displayed on the display device 10 can be identified. Alternatively, the feature amount of the entire display image or a part of the display image may be calculated in advance, and the display image may be identified based on such feature amount. For example, as shown in FIG. 3, a feature amount of a tree image, which is an identification image displayed in the lower left portion of the screen (see symbol a), is calculated in advance, and the display image is displayed based on such feature amount. It can also be identified. As the feature amount, for example, SIFT (Scale Invariant Feature Transform), SURF (Speeded Up Robust Features), or the like can be applied. Here, an example is shown in which the identification image is superimposed on the display image and displayed, but the display image can also be identified based on, for example, a partial feature amount of the display image of the advertisement information.

  The display device 10 displays such a display image at a predetermined viewing angle with directivity. The viewing angle is a range in a space where the user can visually recognize light emitted from the image display unit 10 when the user looks at the display device 10 or a range in a space where the imaging function of the mobile terminal 20 can capture an image. Say. In the present embodiment, the predetermined viewing angle is assumed to be about 10 degrees to 15 degrees, for example. For example, FIG. 4 is a diagram illustrating a relationship between the viewing angle of the display image displayed by the display device 10-1 and the display device 10-2 and the mobile terminal 20 owned by the user. Here, a description will be given assuming that there are a plurality of mobile terminals 20 (mobile terminal 20-1, mobile terminal 20-2, mobile terminal 20-3). Hereinafter, when a plurality of portable terminals 20 exist and are described as different from each other, they are identified and explained as portable terminals 20-1, 20-2,.

  The display device 10-1 and the display device 10-2 display a display image including a two-dimensional barcode indicating different image IDs. For example, when the viewing angle range of the display image displayed from the display device 10-1 is A and the viewing angle range of the display image displayed from the display device 10-2 is B, the portable terminal 20-1 In this position, a display image displayed by the display device 10-1 and a display image displayed by the display device 10-2 can be captured. That is, when the mobile terminal 20-1 can capture a display image displayed by the display device 10-1 and a display image displayed by the display device 10-2, the mobile terminal 20-1 has a range of viewing angles. It can be determined that A exists at a position where the viewing angle range B intersects. Similarly, a portable terminal 20-2 that can capture a display image displayed by the display device 10-1 but cannot capture a display image displayed by the display device 10-2 is within the viewing angle range A. It can be determined that it exists at a position outside the viewing angle range B. The portable terminal 20-3 that cannot capture the display image displayed by the display device 10-1 and cannot capture the display image displayed by the display device 10-2 is the difference between the viewing angle range A and the viewing angle range B. It can be determined that it exists outside. In this way, the display device 10 displays the display image in the direction of the defined viewing angle, whereby the position of the mobile terminal 20 that captured the display image can be specified.

  Here, a display capable of displaying a plurality of display images in different viewing angle directions can be applied to the display device 10. For example, a lenticular display to which a lenticular lens is applied can be applied to the display device 10. FIG. 5 is a diagram schematically showing a lenticular display. For example, the display device 10 includes an LCD (Liquid Crystal Display) 11 that is a liquid crystal display. The LCD 11 includes light emitting elements such as a1 to d1, a2 to d2, a3 to d3, a4 to d4,. A lenticular lens 12 is installed on the front surface of the LCD 11. The lenticular lens 12 refracts the light emitted from the LCD 11 in the viewing angle direction according to the angle of the convex lens. Thus, for example, only images displayed by the issuing elements a1, a2, a3, and a4 are visible in the range of the viewing angle direction A1, and are displayed by c1, c2, c3, and c4 in the range of the viewing angle direction A2. Only the images that are visible are visible. Thereby, for example, in the range of the viewing angle direction A1, the mobile terminal 20-1 faces the direction of the display device 10, and the mobile terminal 20-2 of the display device 10 in the range of the viewing angle direction A2 The captured image in which the image is captured in the direction can be made different. Thereby, the detailed position where the portable terminal 20 captured the display image can be determined.

  For example, FIG. 6 illustrates a plurality of display devices 10 that display a plurality of display images in different viewing angle directions, a mobile terminal 20-1, a mobile terminal 20-2, a mobile terminal 20-3, It is a figure which shows the relationship with the terminal 20-4. Here, the display device 10-1 and the display device 10-2 display a display image including a different identification image for each display device 10 and for each viewing angle direction. For example, depending on the display device 10-1, different display images are displayed in ranges of the viewing angle direction A1, the viewing angle direction A2, the viewing angle direction A3, and the viewing angle direction A4. Depending on the display device 10-2, different display images are displayed in the range of the viewing angle direction B1, the viewing angle direction B2, the viewing angle direction B3, and the viewing angle direction B4. At this time, at the position of the mobile terminal 20-1, a display image displayed in the range of the viewing angle direction A2 by the display device 10-1, and a display displayed in the range of the viewing angle direction B3 by the display device 10-2. Images can be taken. That is, the mobile terminal 20-1 captures a display image displayed in the range of the viewing angle direction A2 by the display device 10-1, and a display image displayed in the range of the viewing angle direction B3 by the display device 10-2. If possible, it can be determined that the mobile terminal 20-1 is present at the position shown in the figure. Similarly, the mobile terminal 20-2 displays a display image displayed in the range of the viewing angle direction A3 by the display device 10-1, and a display image displayed in the range of the viewing angle direction B4 by the display device 10-2. Can be determined to be present at the position shown in the figure. A portable terminal 20-3 that can capture a display image displayed in the range of the viewing angle direction A3 by the display device 10-1 but cannot capture a display image displayed by the display device 10-2 is, for example, as illustrated in the figure. It can be determined that it exists at the position. It can be determined that the mobile terminal 20-4 that cannot capture the display image displayed by the display device 10-1 and cannot capture the display image displayed by the display device 10-2 exists at a position as illustrated in FIG.

Returning to FIG. 1, the mobile terminal 20 is an imaging device including an imaging unit 21 and a transmission unit 22. In the present embodiment, the mobile terminal 20 is described as being applied to a mobile phone terminal, for example. A PC (Personal Computer) or the like can also be applied.
The imaging unit 21 is a camera that includes an imaging element and performs imaging in a predetermined direction. For example, the imaging unit 21 captures a display image displayed by the display device 10 in response to an operation input input from the user to the mobile terminal 20.
The transmission unit 22 communicates with other computer devices via the network 5. For example, the transmission unit 22 transmits the captured image captured by the imaging unit 21 to the position detection device 30.

The position detection device 30 is a computer device connected to the mobile terminal 20 via the network 5. The position detection device 30 includes a position information storage unit 31, a reception unit 32, an input unit 33, and a position information detection unit 34.
The position information storage unit 31 indicates a display image displayed by the display device 10 that displays a display image at a predetermined viewing angle, and a position in the viewing angle direction where the display image is displayed by the display device 10 installed in advance. The position information is stored in association with each other.

  FIG. 7 is a diagram illustrating an example of position information data stored in the position information storage unit 31. Here, for each image ID indicated by the two-dimensional barcode embedded in the display image, position information indicating the range in the viewing angle direction of the display image is associated and stored. For example, as in the example shown in FIG. 4, the position information is the positions of four vertices (a1, b1, c1, d1) in a two-dimensional rectangular range in the viewing angle direction where the display image is displayed by the display device 10. Indicates. The positions of the four vertices are indicated by numerical information indicating, for example, latitude and longitude. Such position information is preliminarily measured and stored in association with the range in the viewing angle direction from the display device 10 on which the display image is displayed. Here, it is assumed that the position information is stored in association with the image ID. However, when the display image is identified by the feature amount of the display image, the position information may be stored in association with the feature amount. it can.

The receiving unit 32 receives the captured image transmitted from the mobile terminal 20 and inputs the received image to the input unit 33.
The input unit 33 receives an input of a captured image obtained by capturing a display image displayed by the display device 10. For example, a display image displayed by the display device 10 is captured by the mobile terminal 20, and a captured image transmitted from the mobile terminal 20 is received by the reception unit 32 and input to the input unit 33. As described above, in this embodiment, an example in which a captured image is transmitted from the mobile terminal 20 will be described. However, a captured image stored in a memory card, a USB (Universal Serial Bus) memory, or the like may be read and input. The image file selected according to the operation from the user may be input. The captured image input to the input unit 33 includes at least one display image displayed by the display device 10. However, one captured image including a plurality of display images may be input, or a plurality of captured images including one display image may be input. In other words, the input unit 33 receives captured images obtained by capturing a plurality of display images displayed by the plurality of display devices 10. In addition, a plurality of captured images obtained by capturing a plurality of display images displayed by the plurality of display devices 10 are input to the input unit 33.

  The position information detection unit 34 reads position information associated with the display image included in the captured image input to the input unit 33 from the position information storage unit 31. For example, the position information detection unit 34 detects the image ID from the two-dimensional barcode included in the display image included in the captured image input to the input unit 33, and acquires the position information associated with the detected image ID. , Read from the position information storage unit 31. Here, when a plurality of captured images obtained by capturing different display images are input to the input unit 33 or when one captured image obtained by capturing a plurality of display images is input, the position information detection unit 34 Then, a plurality of pieces of position information corresponding to the image IDs corresponding to the plurality of display images are read, and a portion where the range of positions indicated by the plurality of pieces of read position information overlaps is detected. For example, from the input captured image, the image ID of the display image displayed in the range of the viewing angle direction A2 from the display device 10-1 in the example of FIG. 6 and the display in the range of the viewing angle direction B3 from the display device 10-2. If the image ID of the displayed image is detected, the position information detecting unit 34 indicates the range of the space specified by the points a2, b2, c2, and d2 indicating the viewing angle direction A2 and the point indicating the viewing angle direction B3. A portion where the space range specified by a7, b7, c7, and d7 overlaps is calculated. Here, when the position information is associated with the feature amount of the display image, the position information detection unit 34 calculates the feature amount of the display image included in the captured image input to the input unit 33 and calculates the calculated feature. The position information associated with the quantity is read from the position information storage unit 31.

Next, an operation example of the position detection system 1 according to the present embodiment will be described with reference to the drawings. FIG. 8 is a flowchart illustrating an operation example of the mobile terminal 20 according to the present embodiment.
When the user carries the mobile terminal 20 and goes to the position where the display device 10 is installed, the mobile terminal 20 captures a display image displayed by the display device 10 in response to an operation input from the user ( Step S1). The transmission unit 22 of the portable terminal 20 transmits the captured image to the position detection device 30 (step S2).

  FIG. 9 is a flowchart for explaining an operation example of the position detection apparatus 30 according to the present embodiment. When receiving the captured image transmitted from the mobile terminal 20 (step S11), the receiving unit 32 of the position detection device 30 inputs the captured image to the input unit 33. When the input unit 33 receives an input of the captured image, the position information detection unit 34 detects an image ID from the two-dimensional barcode of the display image included in the input captured image (step S12). The position information detection unit 34 reads position information corresponding to the detected image ID from the position information storage unit 31 (step S13). Thereby, the portable terminal 20 that has transmitted the captured image to the position detection device 30 can determine that the portable terminal 20 exists at the position indicated by the position information read in step S13.

  According to the position detection system 1 as described above, detailed position information of the mobile terminal 20 can be easily acquired regardless of the presence or absence of surrounding buildings or a change in layout. The position information acquired in this way also indicates that the user with the mobile terminal 20 was at that position. Therefore, based on the position information acquired in this manner, for example, a process for permitting application for a questionnaire, a coupon, or the like can be performed. Moreover, the display image displayed on the display apparatus 10 can also be changed according to the position information determined in this way. For example, according to the detected position of the mobile terminal 20, information can be transmitted from the position detection device 30 to the mobile terminal 20 to perform interactive interactive information communication. For example, when the user is at a specific position, a process of guiding the user to the position of another display device 10 can be performed. In this case, as illustrated in FIG. 10, the position detection device 30 includes a display image distribution unit 35. The display image distribution unit 35 includes a display image in its own storage area, reads a corresponding display image from its own storage area according to the position detected by the position information detection unit 34, and displays the display image on a specific display device 10. Send.

  For example, in any game system, when the user goes to a position where the specific display device 10 is installed with the mobile terminal 20, the mobile terminal 20 displays on the display device 10 in response to an operation input from the user. The displayed display image is captured, and the captured image is transmitted to the position detection device 30. When the reception unit 32 receives a captured image, the position information detection unit 34 detects an image ID included in the captured image, and reads position information corresponding to the image ID from the position information storage unit 31. Next, the position detection device 30 transmits character information such as “go forward 10 meters, turn right and advance 20 meters” to the mobile terminal 20 that has transmitted the captured image. In response to this, the user moves, and when the mobile terminal 20 captures and transmits the display image displayed on the display device 10 installed at the destination position to the position detection device 30, it is determined for the user. It is possible to perform control such that the obtained score is given.

In addition, for example, position information acquired by the GPS function included in the mobile terminal 20 and position information acquired by the present embodiment can be linked. For example, when it is detected that the position information acquired by the mobile terminal 20 using the GPS function is near the position where the display device 10 is installed, the position detection device captures a display image displayed by the display device 10. It is possible to notify the mobile terminal 20 of information such as being able to receive some kind of privilege by transmitting to 30.
Further, user information including attribute information such as a user's hobbies and addresses using the mobile terminal 20 is registered and stored in advance in the position detection device 30 in association with a user ID for identifying the user. When 20 transmits a captured image to the position detection device 30, a user ID may be transmitted to provide information corresponding to the user information.

  In addition, the display image displayed by the display apparatus 10 can display the display image containing the identification image which changes with time. That is, it is possible to display a display image including different identification images for each display device 10, for each viewing angle direction, and for each time. For example, FIG. 11 is a diagram illustrating an example of data stored in the position information storage unit 31 in association with position information corresponding to time. Here, in the position information storage unit 31, position information is stored in association with each display image displayed at a predetermined time. The display device 10 displays a display image according to the time determined as described above. In this way, when the captured image transmitted from the mobile terminal 20 includes a plurality of display images, it is possible to specify the time range when the captured image is captured. For example, when a captured image transmitted from the mobile terminal 20 includes a display image with an image ID “1” and a display image with an image ID “2”, the captured image has an image ID “1”. It can be determined that the image is captured in a time range in which the time range in which the display image is displayed overlaps the time range in which the display image with the image ID “2” is displayed. Here, the time range in which the display image with the image ID “1” is displayed is “9:00 to 17:00”, and the time range in which the display image with the image ID “2” is displayed. Since “3:00 to 12:00”, it can be determined that the image was captured in the range of 9:00 to 12:00. In this way, it is possible not only to determine that the user was at that position with the mobile terminal 20, but also to specify the time that the user was at that position with the mobile terminal 20.

  In addition, the position information detection unit 34 can prevent the position information from being detected when the difference in imaging time when the plurality of captured images input to the input unit 33 are captured exceeds a predetermined threshold. That is, as described above, when a plurality of captured images obtained by capturing different display images are input to the input unit 33, the position information detection unit 34 detects a plurality of image IDs corresponding to the plurality of display images. Then, a portion where the range indicated by the position information corresponding to the image ID overlaps is detected. However, for example, if a plurality of captured images are captured at intervals exceeding several minutes to several tens of minutes, it is considered that the captured images may not be captured at that position. Therefore, the position information detection unit 34 reads the imaging time of the captured image from the attribute information of the plurality of captured images input to the input unit 33, compares the read imaging time, and the difference in imaging time is a predetermined value. When a threshold value (for example, several minutes to several tens of minutes) is exceeded, it is possible to end the process as an error and not detect position information. Thereby, it can determine more reliably that the portable terminal 20 imaged the display image in the position according to the positional information calculated by this embodiment.

In the present embodiment, the position of the four vertices in the rectangular range in which the display image displayed by the display device 10 can be viewed and imaged as position information is shown, but the display image displayed by the display device 10 is viewed The position of the vertex of the rectangle is not necessarily limited as long as the imageable range can be specified. Alternatively, the position information may indicate a range in a three-dimensional direction in which a display image displayed by the display device 10 can be visually recognized and captured.
In the present embodiment, an example in which a two-dimensional barcode that is an identification image included in a display image indicates an image ID for identifying the display image is shown. However, the position information itself is converted into a two-dimensional barcode and the display image is displayed. May be included.

In the present embodiment, the display device 10 receives the display image via the network 5. However, the display image is stored in advance in a storage medium such as a CD (Compact Disc). A display image may be read from such a storage medium and displayed.
The display device 10 may store a display image including the identification image in advance, but the display device 10 stores the identification image and the display image not including the identification image in advance, Apart from the process of displaying the display image, the identification image may be displayed superimposed on the display image. According to this, for example, the identification image can be changed every time regardless of the content of the display image displayed by the display device 10.

  It should be noted that a program for realizing the function of the processing unit in the present invention is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed for position detection. May be. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer system” includes a WWW system having a homepage providing environment (or display environment). The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

  DESCRIPTION OF SYMBOLS 10 ... Display apparatus, 20 ... Portable terminal, 30 ... Position detection apparatus, 31 ... Position information storage part, 33 ... Input part, 34 ... Position information detection part

Claims (9)

The display image displayed by a display device that displays a display image at a predetermined viewing angle is associated with position information indicating the position in the viewing angle direction where the display image is displayed by the display device installed in advance. A position information storage unit stored in memory,
An input unit that receives an input of a captured image obtained by capturing the display image displayed by the display device;
A position information detection unit that reads the position information associated with the display image included in the captured image input to the input unit from the position information storage unit;
A position detection device comprising: The position information storage unit stores the position information in association with display images that are different for each of the plurality of display devices,
Captured images obtained by capturing the plurality of display images displayed by the plurality of display devices are input to the input unit,
The position information detection unit reads the position information associated with the plurality of display images included in the captured image input to the input unit from the position information storage unit, and the plurality of read position information The position detection device according to claim 1, wherein a portion where a range of positions to be displayed overlaps is detected. The position detection device according to claim 2, wherein a plurality of captured images obtained by capturing the plurality of display images displayed by the plurality of display devices are input to the input unit. The position information detection unit does not detect the position information when a difference between imaging times when the plurality of captured images input to the input unit are captured exceeds a predetermined threshold. The position detection apparatus described in 1. The display device displays a plurality of display images in different viewing angle directions, and the position information storage unit stores the position information in association with each of the plurality of display images. The position detection device according to claim 1, wherein the position detection device is a feature of the position detection device. The display device displays different display images for each time, and the position information storage unit stores the position information in association with each display image displayed for each time. The position detection device according to claim 1, wherein the position detection device is a feature of the position detection device. The position information storage unit stores the position information in association with identification information for identifying the display image, which is included in the display image.
The position information detection unit reads the position information associated with the identification information included in the display image included in the captured image input to the input unit from the position information storage unit. The position detection device according to any one of claims 1 to 6. The position information storage unit stores the position information in association with the feature amount of the display image,
The position information detection unit calculates a feature amount of the display image included in the captured image input to the input unit, and the position information storage unit stores the position information associated with the calculated feature amount. The position detecting device according to any one of claims 1 to 6, wherein the position detecting device reads from the position. The display image displayed by a display device that displays a display image at a predetermined viewing angle is associated with position information indicating the position in the viewing angle direction where the display image is displayed by the display device installed in advance. A position information storage unit stored in the memory, an input unit that receives an input of a captured image obtained by capturing the display image displayed by the display device, and the display included in the captured image input to the input unit A computer of an imaging device connected to a position detection device comprising: a position information detection unit that reads the position information associated with an image from the position information storage unit;
Capturing the display image displayed by the display device;
Transmitting the captured image to the position detection device;
A program that executes

Images