JP2006172299A - Composite marker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce misrecognition by reducing the kinds of used markers. <P>SOLUTION: A marker 11 having at least three optically recognizable characteristic points, in which three-dimensional arrangement of the characteristic points is already known and a composite marker are used. The composite marker 10 is made by integrally arranging a storage part 12C for storing specific information of the marker 11 permitting specifying which of the composite markers having the markers 11 with the same characteristic points, an antenna 12A for transmitting the specific information of the marker 11 stored in the storage part 12C in non-contact manner, and an IC chip 12B. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a composite marker used in a system for presenting information using a marker.

  A bar code reader is generally well known as an information presenting apparatus that presents predetermined related information to objects and / or predetermined markers in the real world.

Among them, there is a device that presents information using spatial information of an object and / or a predetermined marker. For example, in Patent Document 1, a two-dimensional code printed on a business card is read by a camera, an ID is analyzed by a program in a computer, and a face photograph of a person corresponding to this ID is displayed as if it is a two-dimensional code on a business card It is disclosed to display on a display on a computer as if it is next to.
JP 2000-82107 A

  The apparatus disclosed in Patent Document 1 is an information presentation apparatus that outputs predetermined related information by inputting an image for a predetermined marker, analyzing the spatial localization information, and recognizing a written ID. The marker and the predetermined information have a one-to-one correspondence. Therefore, in order to present 10 types of information, it is necessary to prepare 10 types of markers.

  However, when an extremely large number of markers are set and the processing device is a portable terminal such as a PDA, high-accuracy image processing cannot be expected. There was a problem that.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a composite marker that can reduce the number of types of markers to be used and reduce erroneous recognition.

One aspect of the composite marker of the present invention is:
An optical marker unit having at least three or more optically distinguishable feature points, and the three-dimensional arrangement of the feature points is known;
Storage means for storing identification information of the optical marker portion that can specify which one of the composite markers having the optical marker portion having the same feature point;
A transmission unit that transmits the specific information of the optical marker unit stored in the storage unit in a non-contact manner;
Comprising
The optical marker unit, the storage unit, and the transmission unit are integrally arranged.

  According to the present invention, it is possible to provide a composite marker that can reduce the number of types of markers to be used and reduce erroneous recognition.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[First Embodiment]
FIG. 1A is a diagram showing a configuration of an information presentation device to which the composite marker information acquisition device according to the first embodiment of the present invention is applied. 1B is a front view of the front surface of the composite marker according to the first embodiment of the present invention, and FIG. 1C is a front view of the back surface of the composite marker.

  In the present embodiment, as shown in FIGS. 1B and 1C, the composite marker 10 is a combination of a marker 11 that is a symbol obtained by encoding information and a non-contact ID tag 12. .

  Here, the marker 11 is arranged on the surface of the composite marker 10, and is composed of a frame portion 11A having a predetermined shape and a symbol or design 11B including characters written therein. That is, a camera that has at least three or more optically distinguishable feature points, has a known three-dimensional arrangement of the feature points, and has shot the image from an image shot to include the feature points The relative position and orientation can be specified.

  Further, the non-contact ID tag 12 is provided on the back surface (or inside) of the marker. In this embodiment, the antenna 12A that serves both for power reception and data transmission / reception, the IC chip 12B that incorporates electronic elements, and information are stored. It is provided as an RFID tag configured with a storage unit 12C for storing. Note that the IC chip 12B and the storage unit 12C are configured separately, but may be configured by a one-chip IC. Further, although the IC chip 12B and the storage unit 12C are rectangular and a dipole antenna is disposed as the antenna 12A on the IC chip 12B, the shape thereof can be changed as appropriate.

  The RFID tag as the non-contact ID tag 12 is an IC chip 12B including a transmission / reception circuit, receives external data transmitted on a carrier wave via the antenna 12A, generates necessary power by the carrier wave, Using the power, data is read and written to the storage unit 12C and transmitted via the antenna 12A, and information is transmitted to the outside.

  The storage unit 12C stores in advance information related to the marker 11 or information related to an article to which the composite marker 10 having the marker 11 is fixed. In the present invention, the term “fixed” is not limited to being directly fixed to the article, but includes indirect fixing, that is, placing the article without changing the predetermined position and orientation relationship. . As information stored in the storage unit 12C, in this embodiment, area information where the composite marker 10 is installed is written. For example, when the composite marker 10 is installed in a five-story building (all areas), the entire area is divided into a plurality of divided areas (for example, for each floor), and the area information is different information for each divided area, that is, what floor Information indicating whether or not is written. In this case, a marker having the same symbol or design 11B, for example, “50” may be present in each segmented area.

  As shown in FIG. 1A, an information presentation device 20 using such a composite marker 10 includes an image input unit 21, a marker detection unit 22, an RFID reading unit 23, a position and orientation detection unit 24, and a marker information storage unit. 25, a related information generation unit 26, a related information storage unit 27, a superimposed image generation unit 28, and a display unit 29. Here, the information presentation device 20 is provided as a portable terminal such as a camera-equipped PDA or a camera-equipped mobile phone. In this case, all the components may be provided in the portable terminal, but a part may be arranged on a server accessible by communication. However, the portable terminal needs to include at least the image input unit 21, the RFID reading unit 23, and the display unit 29.

  Here, the image input unit 21 captures the composite marker 10 directly or indirectly fixed to the object (article) with a camera having a predetermined capturing range, and the captured image is the marker detection unit 22. To enter. The marker detection unit 22 detects the marker 11 of the composite marker 10 from the image input from the image input unit 21, and supplies the detection result to the RFID reading unit 23 and the position / orientation detection unit 24.

  The RFID reader 23 receives a detection result of the marker detection from the marker detector 22 and puts a data read command on the carrier wave in order to read information from the non-contact ID tag 12 which is an RFID tag of the composite marker 10. The information read from the non-contact ID tag 12 is supplied to the position / orientation detection unit 24.

  That is, in the present embodiment, reading of information by the RFID reading unit 23 is performed only when an information acquisition range (a range in which information can be received from the non-contact ID tag 12) exists within the imaging range of the camera of the image input unit 21. By doing this, the consumption of the battery of the information presentation device is suppressed. Here, the information acquisition range only needs to be part of the imaging range of the camera. However, since it is possible to receive more reliably if the imaging range includes the entire information acquisition range, in the present embodiment, the marker 11 is detected when the marker 11 is within a predetermined shooting range of the camera, that is, when it is estimated that the marker 11 is in a predetermined position and orientation. Reading is started. The predetermined position and orientation are generally the position and orientation when facing the marker 11, that is, the position and orientation when facing the antenna 12 </ b> A of the non-contact ID tag 12.

  The position / orientation detection unit 24 uses the information read from the non-contact ID tag 12 from the RFID reading unit 23 and the marker information from the marker detection unit 22 based on the information stored in the marker information storage unit 25. The corresponding marker is identified, the camera position and orientation of the image input unit 21 are detected, and the detection result is supplied to the related information generation unit 26. The marker information storage unit 25 stores information related to the marker such as the template image of the marker, the area information to which the marker belongs, and the position and orientation information where the marker is arranged.

  The related information generation unit 26 extracts information set in advance from the related information storage unit 27 according to the camera position and orientation of the image input unit 21 detected by the position and orientation detection unit 24, and generates related information. Is supplied to the superimposed image generation unit 28. Here, the related information storage unit 27 stores related information such as position and orientation information, shape information, and attribute information of the model arranged in the model space.

  The superimposed image generation unit 28 superimposes the image from the image input unit 21 and the related information generated by the related information generation unit 26 and supplies the superimposed information to the display unit 29. The display unit 29 displays the superimposed image generated by the superimposed image generation unit 28.

  FIG. 2A is an operation flowchart of the information presentation apparatus 20 configured as described above.

  First, as shown in FIG. 2B, the article 30 to which the composite marker 10 is fixed is photographed by the camera of the image input unit 21 and the image is input to the marker detection unit 22 to detect the marker 11 (step). S1). First, the marker detection unit 22 detects a predetermined shape of the marker 11 placed on the surface of the composite marker 10 from the image, that is, a frame portion 11A which is a square frame in the present embodiment (detection of a square frame is performed). Since this is a known image processing method, the description is omitted). Next, the coordinates in the four corner images of the detected frame portion 11A (square frame) are detected, the inside of the square frame is extracted, and affine transformation is performed. Then, pattern matching between the image after the affine transformation and the template image of the marker registered in advance in the marker information storage unit 25 is performed to identify the marker 11 (in this case, the symbol or design 11B is a marker with “50”). However, since the area information is not yet available, it is not possible to specify which area is the “50” marker. If the image does not match the template image of the marker, it is not detected as a marker (step S2), and the process returns to step S1.

  When the marker 11 is detected, the area information is read from the non-contact ID tag 12 by the RFID reader 23 (step S3). This is performed by the RFID reader 23 transmitting a data read command on a carrier wave. That is, in the non-contact ID tag 12, necessary power is generated by the carrier wave received by the antenna 12A, and the IC chip 12B reads information in the storage unit 12C using the power and transmits the information by the antenna 12A. The RFID reading unit 23 receives the information transmitted from the non-contact ID tag 12, and determines whether the received information is area information (step S4). If the area information cannot be detected as a result of the determination, the process returns to step S3, and information is read from the non-contact ID tag 12 again. On the other hand, when area information (for example, “area 1”) is detected, the next step is executed.

  Next, the position / orientation detection unit 24 uses the marker information (“50” marker) detected by the marker detection unit 22 and the area information (“area 1”) detected by the RFID reading unit 23 to generate the image. The composite marker 10 photographed with the camera of the input unit 21 is identified ("50" marker in "Area 1") (step S5).

  When the marker is identified in this manner, the spatial localization information (position and orientation information on which the marker is arranged) of the corresponding marker can be obtained from the marker information storage unit 25. Therefore, the position and orientation detection unit 24 uses the marker 11 in the image. The position and orientation of the camera of the image input unit 21 can be detected from the positions of the four corners (step S6). Then, the related information generation unit 26 extracts information set in advance from the related information storage unit 27 according to the position and orientation of the camera detected by the position and orientation detection unit 24 to generate the related information (step S7). .

  Here, for example, for the marker “50” in “area 1”, the related information storage unit 27 stores the three-dimensional model 27A of the corresponding article 30 and its model space as shown in FIG. Annotation information (“high temperature caution”) 27B arranged under the composite marker 10 is stored as related information.

  Therefore, the superimposed image generating unit 28 superimposes the image from the image input unit 21 and the related information generated by the related information generating unit 26, and as shown in FIG. A superimposed image is displayed on 29A (step S8).

  As described above, when the area information and marker information of the composite marker 10 are detected and the position and orientation of the camera are detected, a superimposed image is displayed on the display screen 29A.

[Second Embodiment]
FIG. 3 is a diagram showing the configuration of the information presentation device 20 to which the composite marker information acquisition device according to the second embodiment of the present invention is applied. This is a configuration when the area ID is stored in the RFID tag as the non-contact ID tag 12.

  That is, the area information itself as in the first embodiment is not stored in the storage unit 12C of the non-contact ID tag 12, but in this embodiment, an ID corresponding to the area is stored. In such a case, an area information storage unit 40 is provided in the information presentation device, and the RFID reading unit 23 extracts area information corresponding to the area ID.

  The non-contact ID tag 12 may store a unique ID and have a table in the area information storage unit 40, or may store spatial localization information (latitude / longitude, etc.) where the marker is present. I do not care.

  FIG. 4A is an operation flowchart of the information presentation apparatus 20 of the present embodiment.

  That is, as in the first embodiment, the article 30 to which the composite marker 10 is fixed is photographed by the camera of the image input unit 21 and the image is input to the marker detection unit 22 to detect the marker 11 (step S1). ).

  When the marker is detected (step S2), in the present embodiment, the RFID reader 23 reads ID information from the non-contact ID tag 12 (step S11). This is performed by the RFID reader 23 transmitting a data read command on a carrier wave. That is, in the non-contact ID tag 12, necessary power is generated by the carrier wave received by the antenna 12A, and the IC chip 12B reads information in the storage unit 12C using the power and transmits the information by the antenna 12A. The RFID reader 23 receives the information transmitted from the contactless ID tag 12, and determines whether the received information is ID information (area ID) (step S12). If the ID information cannot be detected as a result of the determination, the process returns to step S11 and information is read from the non-contact ID tag 12 again. On the other hand, when the ID information is detected, the RFID reading unit 23 extracts the area information corresponding to the ID information from the area information storage unit 40, thereby identifying the area, and the position and orientation of the area information. It gives to the detection part 24 (step S13).

  After that, as in the first embodiment, the position / orientation detection unit 24 identifies the composite marker 10 photographed by the camera of the image input unit 21 from the marker information and the area information (step S5). The detection unit 24 detects the camera position and orientation of the image input unit 21 (step S6), and the related information generation unit 26 generates related information corresponding to the camera position and orientation (step S7). Then, the superimposed image generation unit 28 superimposes the image from the image input unit 21 and the generated related information, and displays the superimposed image on the display screen 29A of the display unit 29 (step S8).

[Third Embodiment]
In the third embodiment of the present invention, the marker 11 is detected using the composite marker 10 configured as described in the first embodiment and the information presentation device, and ID information is obtained from the RFID tag as the non-contact ID tag 12. It detects and identifies a marker by the detected ID information.

  That is, in the first embodiment, there are a plurality of kinds of symbols 11 and designs 11B of the marker 11 in the composite marker 10 such as “50” and “51”, thereby obtaining marker information, and the marker information and the non-marking information. Although the marker is identified based on the ID information read from the contact ID tag 12, in the present embodiment, any composite marker 10 in any area has one type of symbol 11 or design 11B of the marker 11 (eg, “50”). Only), and unique ID information for identifying the composite marker 10 is stored in the storage unit 12C of the non-contact ID tag 12 of each composite marker 10.

  FIG. 4B is an operation flowchart of the information presentation device 20 to which the composite marker information acquisition device is applied in the case of such a composite marker 10.

  That is, as in the first embodiment, the article 30 to which the composite marker 10 is fixed is photographed by the camera of the image input unit 21 and the image is input to the marker detection unit 22 to detect the marker 11 (step S1). ).

  When the marker is detected (step S2), in the present embodiment, the RFID reader 23 reads ID information from the non-contact ID tag 12 (step S11). This is performed by the RFID reader 23 transmitting a data read command on a carrier wave. That is, in the non-contact ID tag 12, necessary power is generated by the carrier wave received by the antenna 12A, and the IC chip 12B reads information in the storage unit 12C using the power and transmits the information by the antenna 12A. The RFID reader 23 receives the information transmitted from the contactless ID tag 12, and determines whether the received information is ID information (area ID) (step S12). If the ID information cannot be detected as a result of the determination, the process returns to step S11 and information is read from the non-contact ID tag 12 again.

  On the other hand, when the ID information is detected, the position / orientation detection unit 24 identifies the composite marker 10 photographed by the camera of the image input unit 21 from the read ID information (step S21). .

  After that, as in the first embodiment, the position / orientation detection unit 24 further detects the position / orientation of the camera of the image input unit 21 (step S6), and the related information generation unit 26 detects the position of the camera. Related information corresponding to the posture is generated (step S7). Then, the superimposed image generation unit 28 superimposes the image from the image input unit 21 and the generated related information, and displays the superimposed image on the display screen 29A of the display unit 29 (step S8).

  The identification of the composite marker 10 from the ID information in the position / orientation detection unit 24 in step S21 is performed by using the ID information as an ID that can specify an arrangement region based on the known information, and using the known information as the marker information storage unit. By registering it in 25, it can be easily implemented. For example, the ID information may include a position (latitude, longitude, altitude) in the real world coordinate system.

[Fourth Embodiment]
FIG. 5A is a front view of the front surface of the composite marker 10 according to the fourth embodiment of the present invention, and FIG. 5B is a front view of the back surface of the composite marker 10.

  In the composite marker 10 according to the present embodiment, the position of the antenna 12A of the RFID tag that is the non-contact ID tag 12 is offset to a position corresponding to the upper side, for example, the outer side of the frame portion 11A of the marker 11.

  In the composite marker 10 according to the first to third embodiments described above, the antenna 12A is installed at the center of the composite marker 10 as shown in FIG. 1C, but the composite marker 10 is fixed to the article. At this time, when the entire image of the article is taken, there is a problem that the information of the non-contact ID tag 12 cannot be reliably read unless the article is fixed near the center of the article. On the other hand, when the antenna 12A is offset upward as in the present embodiment, even when the composite marker 10 according to the present embodiment is fixed below the article, the antenna 12A is positioned at the center of the photographing range when photographing the article. As a result, information can be reliably read out.

  In some cases, it may be desirable to present information only to a specific person. In such a case, the composite marker 10 is fixed at the center of the article, and only the specific person is informed of the offset position of the antenna 12A, so that the general person who does not know the antenna 12A is at the center of the shooting range. Since it cannot be captured, it is possible to prevent reading of information of the non-contact ID tag 12.

  In the figure, only the case where the antenna 12A is offset upward is shown, but the direction of the offset is not limited to the upward direction.

  When detecting the marker 11, a symbol such as an arrow indicating a known offset position or direction of the antenna 12 </ b> A may be superimposed on the display screen 29 </ b> A of the display unit 29. If the operator adjusts the relative position of the information presentation device 20 as the composite marker information acquisition device and the antenna 12A in accordance with the superimposed arrow or the like, the optimal relative position for information acquisition can be maintained. That is, the relative position between the composite marker information acquisition device (information presentation device 20) and the antenna 12A when acquiring information on the non-contact ID tag 12 by the display of an arrow or the like as described above makes accurate information acquisition possible. The operator can be guided or guided so as to have a more appropriate positional relationship that can be expected.

[Fifth Embodiment]
FIG. 6A is a front view of the front surface of the composite marker 10 according to the fifth embodiment of the present invention, and FIG. 6B is a front view of the back surface of the composite marker 10.

  In the present embodiment, when the position of the antenna 12A of the RFID tag which is the non-contact ID tag 12 is offset upward as in the fourth embodiment, a line 13 indicating the position of the antenna 12A is displayed on the surface of the composite marker 10. It is arranged.

  That is, in the fourth embodiment, there is a possibility that the information of the non-contact ID tag 12 cannot be surely read unless the position of the antenna 12A of the composite marker 10 is grasped in advance. By directing the camera of the image input unit 21 so that the line 13 indicating the center is the center of the screen, reading of information from the non-contact ID tag 12 becomes more reliable.

  When the position of the antenna 12A of the non-contact ID tag 12 is offset downward, it is as shown in FIGS. 7 (A) and 7 (B).

  The display indicating the position of the antenna is not limited to the line 13 and may be an image such as a two-dimensional barcode.

  Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications and applications are naturally possible within the scope of the gist of the present invention.

  For example, as a symbol in which information is encoded, at least three or more optically distinguishable feature points are included, and the three-dimensional arrangement of the feature points is known and photographed so as to include the feature points The optical marker that can specify the relative position and orientation of the camera that captured the image from the image has been described as an example. However, as long as it functions as a marker that can specify the three-dimensional position and orientation, It may be anything.

  Further, the non-contact ID tag 12 is not limited to an RFID tag, and any tag can be used as long as it can transmit information in a non-contact manner such as infrared rays.

  Further, in the above embodiment, the area information, the area ID, the ID information, and the like are stored in the storage unit 12C of the non-contact ID tag 12. However, the symbols and designs 11B of the marker 11 of the composite marker 10 are further stored. Information may also be stored. For example, if arrangement information that can specify the relative arrangement of the symbol or the design 11B is stored, the position and orientation of the marker 11 can be stored without storing the position and orientation information of the marker in the marker information storage unit 25. Can be estimated.

(Appendix)
The invention having the following configuration can be extracted from the specific embodiment.

(1) an optical marker unit having at least three or more optically distinguishable feature points, and the three-dimensional arrangement of the feature points is known;
Storage means for storing identification information of the optical marker portion that can specify which one of the composite markers having the optical marker portion having the same feature point;
A transmission unit that transmits the specific information of the optical marker unit stored in the storage unit in a non-contact manner;
Comprising
The composite marker, wherein the optical marker unit, the storage means, and the transmission unit are integrally arranged.

(Corresponding embodiment)
The third to fifth embodiments correspond to the embodiments relating to the composite marker described in (1). In these embodiments, the composite marker 10 is the composite marker, the marker 11 is the optical marker unit, the storage unit 12C is the storage unit, and the antenna 12A and the IC chip 12B are the transmission unit. Correspond.

(Function and effect)
The composite marker described in (1) transmits the specific information of the optical marker part.

  Therefore, according to the composite marker described in (1), it is possible to distinguish composite markers having the same optical marker portion, so that it is possible to reduce the number of types of markers to be used and to realize erroneous recognition. Can be reduced.

  (2) The composite marker according to (1), wherein the transmission unit includes an antenna and an IC chip.

(Corresponding embodiment)
The third to fifth embodiments correspond to the embodiment relating to the composite marker described in (2).

(Function and effect)
According to the composite marker described in (2), since a necessary circuit is formed as an IC chip, it can be formed thin.

  (3) The composite marker according to (1), wherein the specific information stored in the storage unit includes a position in a real world coordinate system.

(Corresponding embodiment)
The third to fifth embodiments correspond to the embodiments relating to the composite marker described in (3).

(Function and effect)
According to the composite marker described in (3), since the position in the real world coordinate system is stored, the composite marker can be specified in the device that acquires information from the composite marker, and the composite marker is directly used. Can detect marker placement.

  (4) The composite marker according to (1), wherein the specific information stored in the storage unit includes an ID that can specify an arrangement region based on known information.

(Corresponding embodiment)
The third to fifth embodiments correspond to the embodiment relating to the composite marker described in (4).

(Function and effect)
According to the composite marker described in (4), in the apparatus that acquires information from the composite marker, the composite marker can be easily identified by the ID and the known information, and the arrangement of the composite marker can be detected.

  (5) The composite marker according to any one of (1) to (4), wherein a plurality of composite markers having the same optical marker portion are arranged in an area where the composite marker is placed. Marker.

(Corresponding embodiment)
The embodiments relating to the composite marker described in (5) correspond to the third to fifth embodiments.

(Function and effect)
According to the composite marker described in (5), since the optical marker portion can be specified by the specifying information, there is no problem even if a plurality of optical marker portions having the same feature point are used. Therefore, the number of apparent marker types can be reduced.

FIG. 1A is a diagram showing a configuration of an information presentation device to which the composite marker information acquisition device according to the first embodiment of the present invention is applied, and FIG. 1B is a diagram according to the first embodiment of the present invention. It is a front view of the surface of a composite marker, and FIG.1 (C) is a front view of the back surface of the composite marker. 2A is a diagram showing an operation flowchart of the information presentation apparatus in the first embodiment, FIG. 2B is a diagram showing articles arranged in real space, and FIG. 2C is a related information storage unit. It is a figure which shows the memorize | stored relevant information, FIG.2 (D) is a figure which shows a display example. FIG. 3 is a diagram illustrating a configuration of an information presentation apparatus to which the composite marker information acquisition apparatus according to the second embodiment of the present invention is applied. FIG. 4A is a diagram showing an operation flowchart of the information presenting apparatus in the second embodiment, and FIG. 4B is information applied to the composite marker information acquiring apparatus according to the third embodiment of the present invention. It is a figure which shows the operation | movement flowchart of a presentation apparatus. FIG. 5A is a front view of the front surface of the composite marker according to the fourth embodiment of the present invention, and FIG. 5B is a front view of the back surface of the composite marker. FIG. 6A is a front view of the front surface of the composite marker according to the fifth embodiment of the present invention, and FIG. 6B is a front view of the back surface of the composite marker. FIG. 7A is a front view of the front surface of the modified example of the composite marker according to the fifth embodiment, and FIG. 7B is a front view of the back surface of the composite marker of the modified example.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 10 ... Composite marker, 11 ... Marker, 11A ... Frame part, 11B ... Symbol and design, 12 ... Non-contact ID tag, 12A ... Antenna, 12B ... IC chip, 12C ... Memory | storage part, 13 ... Line, 20 ... Information presentation apparatus 21 ... Image input unit, 22 ... Marker detection unit, 23 ... RFID reading unit, 24 ... Position and orientation detection unit, 25 ... Marker information storage unit, 26 ... Related information generation unit, 27 ... Related information storage unit, 27A ... 3 Dimensional model, 27B ... annotation information, 28 ... superimposed image generation unit, 29 ... display unit, 29A ... display screen, 30 ... article, 40 ... area information storage unit.

Claims (5)

An optical marker unit having at least three or more optically distinguishable feature points, and the three-dimensional arrangement of the feature points is known;
Storage means for storing identification information of the optical marker portion that can specify which one of the composite markers having the optical marker portion having the same feature point;
A transmission unit that transmits the specific information of the optical marker unit stored in the storage unit in a non-contact manner;
Comprising
The composite marker, wherein the optical marker unit, the storage means, and the transmission unit are integrally arranged.   The composite marker according to claim 1, wherein the transmission unit includes an antenna and an IC chip.   2. The composite marker according to claim 1, wherein the specific information stored in the storage means includes a position in a real world coordinate system.   2. The composite marker according to claim 1, wherein the specific information stored in the storage unit includes an ID capable of specifying an arrangement region based on known information.   5. The composite marker according to claim 1, wherein a plurality of composite markers having the same optical marker portion are disposed in a region where the composite marker is disposed.

Images