JP2010066389A - Information display device and information display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information display device for displaying information in such a size to be easily photographed with a camera on a display screen. <P>SOLUTION: The information display device includes: a display part for displaying information on the display screen; a display image storage part for storing variable display images displayed in variable sizes on the display screen; a distance measuring part for measuring a distance from the display screen to a photographing camera which photographs the variable display image displayed on the display screen; a display magnification control part for controlling display magnification of the variable display image correspondingly to the distance measured by the distance measuring part; and a display drive part for displaying the variable display image in the size controlled by the display magnification control part on the display screen. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an information display device and an information display method for displaying information on a display screen, and in particular, information for displaying a display image (particularly a code information image) displayed on the display screen in a size that can be easily captured by a camera. The present invention relates to a display device and an information display method.

Image recognition systems for one-dimensional barcodes and two-dimensional barcodes (particularly QR codes (registered trademark)) are known. For example, in order to display the price of a product, the unified bar code is printed on a product directly or on a product packaging, a sticker attached to the packaging, a label attached to the product, or the like. For example, in the manufacturing industry, the two-dimensional bar code displays the material and processing process of the product. In the distribution industry, it displays the shipping source, destination, and distribution process of the product. In order to display materials and materials, the advertising industry is used to display the source of more detailed information on products. In particular, a one-dimensional bar code, a two-dimensional bar code, or a QR code is displayed together with an advertising image on an advertising medium, and photography is possible using a camera. The person who sees the advertisement image acquires the advertiser's URL by photographing the QR code using the camera function of the mobile phone, and acquires more detailed product information by accessing the URL. Can do.
Usually, the one-dimensional bar code, the two-dimensional bar code, and the QR code are used by printing directly on a product or on a package of the product, a sticker attached to the package, or a label attached to the product. Then, the information included in the code can be acquired by photographing these codes with a camera and recognizing the information included in the image. However, when taking a one-dimensional barcode, two-dimensional barcode, and QR code with a camera, if the distance between the subject and the camera is not adjusted appropriately, these codes can be taken and information can be obtained by image recognition. Can not.

In order to adjust the distance between the subject and the camera appropriately and shoot the address barcode or business card in an appropriate size, a frame that prescribes a predetermined range for displaying the address barcode or business card is displayed on the screen in advance. Patent Document 1 discloses a technique for recognizing an image by displaying an image photographed by the above method in the frame, capturing the image displayed in the frame, and performing image processing.
JP-A-9-185695

In Patent Document 1, a frame for displaying barcode or noun information is displayed on a screen in advance, and an image captured by a camera is displayed in the frame, thereby simplifying image processing.
By the way, in recent years, the size of the display device has become very large, for example, the long side is 1 m to 2 m or more like a wall, and such a large display device displays an advertisement image, for example. Or it is used to display materials at video conferences, lectures, briefing sessions, etc. More detailed information can be obtained by photographing with a camera owned by a person watching an advertising image displayed on such a large display device or a participant of a video conference, lecture, briefing session, etc. May be provided. In particular, it is effective to display a QR code together with advertisement images or materials used in video conferences, lectures, briefing sessions, etc., and to provide information by photographing the QR code. In this case, since the QR code must be photographed with an appropriate size, the image is photographed using the zoom function of the camera or adjusted to an appropriate size by moving the camera back and forth. If the QR code is photographed at an appropriate size, information can be obtained by analyzing the QR code. However, the zoom function of the camera is troublesome to operate, and the adjustment of the zoom function is difficult because the operation of the zoom function is slow. . In addition, an image shot using the zoom function has poor image quality, and the QR code may not be analyzed. In order to move the camera back and forth, a large space is required, but when there are many participants such as conferences, lectures, briefing sessions, etc., the range that can be moved is small, so it is sufficient to take images. The size of can not be adjusted.

  In view of the above problems, the present invention provides an information display device and an information display method for displaying information on a display screen in a size that can be easily captured by a camera.

  In order to solve the above problems, an information display device of the present invention is an information display device that displays an optically readable image by an external device, the display unit displaying an image on a display screen, and the display Measured by a display image storage unit that stores variable display image information to be displayed in a variable size on the screen, a distance measurement unit that measures the distance from the display screen to the external device, and the distance measurement unit A display magnification control unit that controls a display magnification of the variable display image according to a distance; and a display drive unit that displays the variable display image on the display screen in a size controlled by the display magnification control unit; It is characterized by providing.

  Here, the variable display image is, for example, a one-dimensional barcode or a two-dimensional barcode, and in particular, a QR code. In addition to this, variable display images include character data, numeric data, pictures or illustrations, and are all display images that are provided to the person watching the advertisement image, or to participants such as conferences, lectures, and explanatory meetings. It may be a video.

  The information display device of the present invention has a display magnification of the variable display image according to the distance measured by the distance measuring unit that measures the distance from the display screen to the external device that captures the variable display image displayed on the display screen. Since the display magnification control unit for controlling the display is provided, it is possible to automatically control the variable display image to a size that can be easily captured by an external device. In addition, since the present invention includes a display drive unit that displays a variable display image in a size controlled by the display magnification control unit on the display screen, the variable display image can display information in a controlled size. Therefore, information can be displayed in a size that allows the variable display image to be easily photographed by an external device.

According to another aspect of the present invention, there is provided an information display method. In order to solve the above-described problem, the present invention includes a display image storage unit that stores a variable display image to be displayed in a variable size on a display screen. A distance measuring step for measuring a distance from a screen to a photographing camera for capturing the variable display image, a display magnification control step for controlling a display magnification of the variable display image according to the measured distance, and the display screen Furthermore, a display driving step for displaying the variable display image at a controlled size of the display magnification is provided.
Thereby, information can be displayed on the display screen in a size that can be easily photographed by the camera.

  According to the present invention, an information display device and an information display method for automatically controlling to display information in a size that can be easily photographed by a camera are provided.

FIG. 1 is a block diagram showing the configuration of the information display apparatus of the present invention.
The information display device 1 includes a control unit 10, a display unit 20, an audio output unit 30, a ROM 40, a RAM 50, a first imaging unit 60, a second imaging unit 70, an image analysis unit 80, and an HDD 90. Here, the parts necessary for configuring the information display device of the present invention are shown, but functional parts such as a document creation function and a graph creation function may be provided, and other images may be captured via a network. The communication function part may be provided. That is, the information display apparatus of the present invention can be configured using a general personal computer.

  The control unit 10 is a part that controls the entire information display device 1 of the present invention, and is configured by a microprocessor or an LSI that can be programmed. In addition, any of an FPGA (Field Programmable Gate Array), an ASIC (Applicant Specific Integrated Circuit) that is an integrated circuit designed and manufactured for a specific application, and a circuit having other arithmetic functions may be used. The control unit 10 reads out the control program stored in the ROM 40 and sequentially executes each step of the present invention, thereby causing each part to function as predetermined, thereby realizing the information display device of the present invention.

  The display unit 20 includes a liquid crystal monitor 21, a liquid crystal display controller 22, and a VRAM 23. The liquid crystal monitor 21 may be replaced with a plasma display device, an organic EL display device, other display devices, or the like. The liquid crystal monitor 21 of the present invention includes a display screen having at least one side of 1 m or more, for example. That is, it has a display screen whose long side is 1 m to 2 m or more, and has a very large display screen like the entire wall. The present invention is directed to the display unit 10 having such a large display screen. The information display device of the present invention displays an advertisement image for advertising a product and code information for displaying the origin of more detailed data on such a large display screen. Or, on such a large display screen, materials and information images used in meetings, lectures, briefing sessions, etc. are displayed, and code information for displaying the origin of more detailed information is displayed to the participants. In particular, the code information indicating the origin of the detailed data of the advertisement image or the code information indicating the origin of the detailed information to the participant is a digital camera or Displaying in a size suitable for shooting using the camera function of the mobile phone. Therefore, the present invention displays on the display screen advertisement images of product advertisements or materials and information images used in meetings, lectures, briefings, etc. in a predetermined size, and displays the origin of detailed data The code information to be provided or the code information provided to the participant is displayed in a variable size.

The audio output unit 30 is an audio output unit such as a speaker that outputs an input audio signal.
The ROM 40 stores a control program for controlling the information display device of the present invention. In addition, a program for realizing functions such as a document creation function and a graph creation function is also stored.

The RAM 50 is a storage unit that is accessed as data by the control unit 10 and is used as a work memory that temporarily stores data. The RAM 50 includes a QR code data storage unit 51, an advertisement image data storage unit 52, and a QR code image data storage unit 53.
The QR code data storage unit 51 includes Table 1 for displaying a QR code image. The QR code image width, the QR code image height, the enlargement ratio of the QR code image, and the distance to the person are respectively represented as variable names. Enter a value. When there are a plurality of QR code images, a plurality of such Table 1 may be provided.

The advertisement image data storage unit 52 is a part that develops and stores advertisement image data to be displayed on the liquid crystal monitor 21. When there are a plurality of advertisement image data, the plurality of advertisement image data is developed in the advertisement image data storage unit 52. The advertisement image data has a preset display size and provides a fixed display image. In this embodiment, it expand | deploys so that it may display on the whole display screen of a display part.
The QR code image data storage unit 53 is configured to be paired with the advertisement image data stored in the advertisement image data storage unit 52, and develops and stores the QR code image data. Therefore, when a plurality of advertisement image data are prepared, a plurality of QR code image data is developed in the QR code image data storage unit 53 according to the plurality. As will be described later, the display magnification of the QR code image data is variable, the display magnification is controlled according to the distance between the display unit 20 and the photographing camera, and a variable display image whose size is automatically controlled is provided.

  In the above description and the following description, the RAM 50 is described as storing the advertisement image data and the QR code image data. However, the advertisement image data is, for example, a document image used in a meeting, a lecture, or an explanation meeting. As described above, any fixed display image may be used. The QR code image data may be replaced with a variable display image including, for example, a one-dimensional barcode, a two-dimensional barcode, numeric data, character data, a picture, or illustration data. These fixed display image and variable display image may be moving images.

  The first photographing unit 60 and the second photographing unit 70 are cameras installed on both side surfaces of the liquid crystal monitor 21. For example, as shown in FIG. 2, it is installed near the center of the side surface of the liquid crystal monitor 21. The first photographing unit 60 and the second photographing unit 70 are connected by a wired or wireless connection via a USB (Universal Serial Bus) or the like, and shoot a still image or a moving image. As described with reference to FIG. 3 using the images taken by the first photographing unit 60 and the second photographing unit 70, the image displayed on the display screen is photographed from the display screen by processing by the stereo method. Measure the distance to the camera.

  The image analysis unit 80 operates according to an instruction from the control unit 10 and analyzes images captured by the first imaging unit 60 and the second imaging unit 70. The image analysis unit 80 performs image analysis of the first imaging unit 60 and the second imaging unit 70 and recognizes a person in the image. That is, both eyes, nose, and mouth in the image are recognized to recognize a person who is looking at the display unit 20. If it is recognized that there are a plurality of persons in front of the display unit 20, a person near the front of the QR code image displayed on the display screen is selected. When there are a plurality of persons near the front of the QR code image, a person close to the display screen is selected. Next, it is analyzed whether or not the camera owned by the recognized person is directed toward the display unit 20. The distance from the display unit 20 to the person is calculated based on the shift in the screen of the person photographed by the first photographing unit 60 and the second photographing unit 70.

The HDD 90 is constituted by a hard disk, provides a large-capacity storage medium, and enables addition and change of data.
The HDD 90 includes an image data storage unit 91. The image data storage unit 91 stores a display image storage unit 91a for storing an image data file (display jpg) to be displayed on the display unit 20, and an advertisement image file (to be displayed on the display unit 20). koukoku.jpg), an advertisement image storage unit 91b for storing QR data files (QRData.gif), a QR data storage unit 91c for storing QR data files (QRData.gif), and an address data storage unit 91d for storing address data files (address.bmp). In the embodiment of FIG. 1, one display image storage unit 91a, advertisement image storage unit 91b, QR data storage unit 91c, and address data storage unit 91d are shown. However, when storing a plurality of data, It is good to have multiple. Then, it provides image data, advertisement image data, QR code image data, and address data to be displayed on the display unit 10 in accordance with instructions from the control unit 10.

The HDD 90 includes a setting information storage unit 92 and includes Table 2 and Table 3.
Table 2 stores setting values for determining the distance from the display unit to the person by analyzing the images captured by the first imaging unit 60 and the second imaging unit 70. That is, Table 2 stores the inter-camera distance (variable name D) and the camera focal length (variable name f) of the first photographing unit 60 and the second photographing unit 70, and columns for inputting values respectively. Prepare.
Table 3 is a table that stores data necessary to determine the display size of the advertisement image and the QR code image. Table 3 shows ID number, advertisement image file name, QR code image file name, QR code display center coordinates (X coordinate, Y coordinate), QR code optimum display distance (K), QR code size coefficient (S) Are stored, and each has a field for inputting a value.

  The optimum display distance (K) of the QR code is a value that depends on the size of the QR code image. When the QR code image is small, the optimum display distance (K) of the QR code is set to a small value. When the image is large, the optimum display distance (K) of the QR code is set to a large value. In the example shown in Table 3, since the QR code image is relatively large for the ID number “1”, the optimum display distance (K) of the QR code is set to 5, and the ID number “2” is the QR code. Since the image is relatively small, 2 is set as the optimum display distance (K) of the QR code.

The QR code size coefficient (S) is a coefficient for determining the size of the QR code image according to the distance from the display unit to the person, and the size of the QR code image according to the installation state of the display unit. This is a coefficient for finely adjusting the thickness. That is, when the QR code size coefficient (S) is set to 1, when the distance from the display unit to the person is doubled, the size of the QR code image is doubled. If you do not want to make the QR code image too large even if the distance from the display unit to the person is large, set the QR code size coefficient (S) to a small value, and conversely the distance from the display unit to the person is large. When the QR code image is to be enlarged, the QR code size coefficient (S) is set to a large value. In the example shown in Table 3, since the ID number “1” does not want to make the QR code image very large, the QR code size coefficient (S) is set to 1.2, and the ID number “2” is set. Since it is desired to enlarge the QR code image, the QR code size coefficient (S) is set to 3.2.
The QR code size coefficient (S) can be set arbitrarily, and is proportional to the distance from the display unit to the person, or a quadratic function such as S = (Y / K) ² . You may set as follows.

The image data (display jpg) stored in the display image storage unit 91a is input to the advertisement image file name column of ID number “1” in Table 3, and the address data storage unit 91d is input to the QR code image file name column. Input the stored address data (address bmp). Further, the image data (koukoku.jpg) stored in the display image storage unit 91b is input to the advertisement image file name column of ID number “2” in Table 3, and the address data storage unit is input to the QR code image file name column. Address data (QRData.gif) stored in 91c is input. Thereby, a combination of image data and QR code image data is set.
In this embodiment, since the image data is displayed on the entire display screen, it is not necessary to set coordinates. However, when setting the display position of the image data, the X coordinate and Y coordinate on the display screen may be set. When a plurality of image data are displayed on the display screen, the display center position of each image data may be set by the X coordinate and the Y coordinate.
In the QR code image data, the coordinates for setting the display position of the QR code image are set by the X coordinate and the Y coordinate of the display center of the QR code image, and the setting for enlarging or reducing the QR code image is as follows: The optimum display distance (K) of the QR code and the size coefficient (S) of the QR code are set.

FIG. 2 is a diagram for explaining the arrangement of the liquid crystal monitor 21 and the first photographing unit 60 and the second photographing unit 70. As shown in FIG. 60 and the 2nd imaging | photography part 70 are each arrange | positioned.
When the first image capturing unit 60 and the second image capturing unit 70 arranged in this way photograph a person who is watching an advertisement image or a participant such as a meeting, lecture, information session (hereinafter referred to as “person U”). If the person U is on the right side of the center of the liquid crystal monitor 21, for example, as shown in FIG. 2B, an image photographed by the first photographing unit 60 installed on the left side of the liquid crystal monitor 21 is a camera. The person U is photographed on the screen of FIG. On the other hand, the image taken by the second photographing unit 70 on the right side of the liquid crystal monitor 21 is photographed while the person U is shifted to the right side on the camera screen. That is, the images taken by the first photographing unit 60 and the second photographing unit 70 are photographed so that the same person has a deviation Z. In the present invention, the distance between the liquid crystal monitor 21 and the person is calculated by the stereo method based on the deviation Z, and the display size of the QR code is controlled according to the distance.
The display size of the QR code image is controlled in accordance with the distance from the display unit to the photographing camera. When it is difficult to recognize the camera image, the person U is recognized and displayed approximately. The distance from the camera to the camera can be used.

FIG. 3 is a diagram for explaining a method for calculating the distance from the liquid crystal monitor 21 to the person based on the images taken by the first photographing unit 60 and the second photographing unit 70. Here, the calculation is based on the principle of the stereo method. An example will be described.
In FIG. 3, A is a line connecting the first imaging unit 60 and the second imaging unit 70, and B is a line parallel to the line A and the position where the person U is present. A distance T between the lines A and B is a distance from the liquid crystal monitor 21 to the person U.
In order to obtain the distance T, the distance between the first photographing unit 60 and the second photographing unit 70 is D, the focal length of the cameras of the first photographing unit 60 and the second photographing unit 70 is f, and the first photographing unit 60 on the left side. The distance from the lens center line E to the person U on the camera imaging plane is XL, and the distance from the lens center line F of the right second imaging unit 70 to the person U on the camera image is XR. If the distance between the person U and the lens center line E is XL ′ on the surface B where the person U is located, and XR ′ is the distance between the person U and the lens center line F on the surface B where the person U is located, The distance T between the lines A and B can be obtained from the equation.
XL ′: XL = T: f
XR ′: XR = T: f
However, XL ′ + XR ′ = D.
Therefore, Y = Df / (XL + XR).
The above XL and XR are distances from the center of the person U on the photographing plane. When the coordinates on the image are replaced by xl and xr, the coordinates of the half of the image are H.
XL = xl-H
XR = H-xr
It becomes. Therefore, the distance T between the lines A and B is T = Df / (xl−xr).
That is, since xl-xr is the shift Z between the left and right images, the distance T between the lines A and B is expressed by the following equation.
T = Df / Z

The advertisement image and the QR code image are displayed on the liquid crystal monitor 21 as shown in FIG. 4 according to the distance between the liquid crystal monitor 21 and the person U measured as described above. That is, FIG. 4A shows an example in which the image data files (display.jpg) and (address.bmp) stored in the image data storage unit 91 of the HDD 90 are expanded on the RAM 50. 4B, when the distance T between the liquid crystal monitor 21 and the person U is short, the advertisement image g and the QR code image j1 are combined and developed on the RAM 50, and transferred to the display unit 20 for display. An example is shown. In this case, the QR code j1 is displayed relatively small because the distance T between the liquid crystal monitor 21 and the person U is short. FIG. 4C shows a case where the distance T between the liquid crystal monitor 21 and the person U is far, and the display unit 20 displays the advertisement image g and the QR code j2. In this case, the QR code j2 indicates that the display is relatively large because the distance T between the liquid crystal monitor 21 and the person U is long.
In this embodiment, the advertisement image is displayed on the entire display screen, and the QR code image is displayed at a predetermined position. However, the advertisement image may be plural, and the advertisement image and the conference, lecture, briefing session, etc. The document image used in the above may be displayed simultaneously by dividing the display screen. In addition, when there are a plurality of advertisement images, a plurality of QR code images may be displayed in accordance with the plurality of advertisement images.

Since the information display device of the present invention automatically controls the size of the QR code displayed on the liquid crystal monitor 21 according to the distance between the liquid crystal monitor 21 and the person U, the flow chart shown in FIGS. Processing is performed.
The flowchart of FIG. 5 shows a process of developing the advertisement data and the QR code image data on the memory, synthesizing the images, and transferring the display data to the display unit 20.
As shown in FIG. 5, when the apparatus of the present invention starts to operate, in step S1, it is determined that the person U is not captured, and the QR code enlargement ratio R = 1.0 in Table 1 of the RAM 50 is set. Next, in step S <b> 2, advertisement data is acquired from the image data storage unit 91, and is expanded in the advertisement image data storage unit 52 of the RAM 50. For example, when displaying the ID number “1” in Table 3, the display.jpg file of the advertisement image storage unit 91 a is acquired and expanded in the advertisement image data storage unit 52 of the RAM 50. Further, the QR code image data is acquired from the image data storage unit 91 and developed in the QR code image data storage unit 53 of the RAM 50 (step S3). For example, when the ID number “1” in Table 3 is displayed, the address.bmp file of the QR data storage unit 91 d is acquired and developed in the QR image data storage unit 53 of the RAM 50. At this time, the center position of the QR code image data storage unit 53 is set to the X and Y coordinates on the display screen.
Next, the vertical size dH and horizontal size dW of the QR code are obtained from Table 1 storing the QR code image data (step S4). In step S5, the QR code image data on the QR code image data storage unit 53 is enlarged R times in the vertical and horizontal directions according to the enlargement ratio in Table 1. That is,
dW = R × dW
dH = R × dH
Ask for.
Next, in step S6, the QR code image data is overwritten at the position of the coordinates (X-dW / 2, Y-dH / 2) of the advertisement data developed on the RAM 50. That is, the enlarged QR code image data storage unit 53 is developed on the memory around the center position of the QR code image data storage unit 53 developed in step S3. In step S7, the display data obtained by combining the advertisement data and the QR code is transferred to the display unit 20 and displayed on the liquid crystal monitor 21.

FIG. 6 shows a process for obtaining the display magnification rate of the QR code.
First, in step S <b> 11, image data showing a person is acquired from the image analysis unit 80. In step S12, it is determined whether or not a person is included in the image data acquired from the image analysis unit 80. If a person is shown, the process proceeds to step S13. In step S13, the recognition state of the eyes, nose, and mouth of the face of the person U is acquired from the image data that shows the person. It is determined whether the eyes, nose and mouth can be recognized from the recognition state (step S14). Thus, when recognizing eyes, nose, and mouth, it may be determined whether or not the skin color can be recognized. Thereby, it is determined whether or not the person U is looking at the liquid crystal monitor 21.
Next, in step S15, it is determined whether or not the mobile phone is shown. If the mobile phone is shown, in step S16, the recognition state of the mobile phone held in the hand of the person shown in the image analysis unit 80 is acquired. In step S17, it is determined whether or not the mobile phone can be recognized and whether or not the camera of the mobile phone is pointed at the liquid crystal monitor 21. That is, it recognizes the shape of the mobile phone and determines whether the camera lens of the mobile phone can be recognized. In steps S15 to S17, it is determined whether or not the mobile phone is going to photograph the QR code. If it is difficult to recognize the image of the mobile phone in steps S15 to S17, steps S15 to S17 may be skipped. Although not shown in this flow, when a plurality of persons U or mobile phones are recognized, the person or mobile phone in front of the QR code image on the display screen is selected. Further, when there are a plurality of persons or mobile phones in front of the QR code image on the display screen, the person or mobile phone close to the display screen is selected.

In step S <b> 18, the coordinate xl, which is the X coordinate where the person U is captured, is acquired from the image analysis unit 80 from the image data of the left camera 60. In step S <b> 19, a coordinate xr, which is an X coordinate where the person U is captured, is acquired from the image analysis unit 80 from the image data of the right camera 70. In step S20, the shift Z is obtained from the X coordinate xl of the person shown in the image data of the left camera and the X coordinate xr of the person shown in the image data of the right camera. That is, Z = xl−xr is calculated. Next, in step S21, the distance T from the display unit 20 to the person U is calculated using the distance D between the left and right cameras, the focal length f of the camera, and the shift Z. That is, T = D × f / Z is calculated.
Next, in step S22, the magnification R (that is, 1.0) preset in step S1 of the flowchart of FIG. 5 is substituted into the variable R ′. In step S23, the QR code enlargement ratio R is calculated using the distance T from the display unit 20 to the person U calculated in step S21, the QR code optimal display distance K, and the QR code size coefficient S. The QR code size coefficient S, that is, R = S × T / K is calculated. In step S24, it is determined whether or not the enlargement ratio variable R ′ is equal to the enlargement ratio R. That is, it is determined whether or not R = R ′. If NO, the process proceeds to step S2 in FIG. If YES, the process moves to step S11.
In the above-described steps S12, S14, S15, and S17, if NO, that is, if the person U is not captured, if the eyes, nose, mouth cannot be recognized, or if the mobile phone cannot be recognized, the process proceeds to step S25. It is determined whether the enlargement ratio is 1.0. If YES, the process moves to step S11. If NO, in step S26, the enlargement ratio of the data on the RAM and the QR code image is set to R = 1.0, and the process proceeds to step S2. In other words, the image is displayed at a preset magnification.
Through the processing as described above, according to the present invention, it is possible to control to display information in a size that can be easily photographed by the camera owned by the person U.

In the above description, the case where the advertisement image and the QR code image are displayed on the display screen has been described. However, the advertisement image is replaced with a material image used in a conference, lecture, information session, etc. A bar code, a two-dimensional bar code, numeric data, character data, or image data may be used instead. Accordingly, the information display device of the present invention uses, for example, a liquid crystal monitor having at least one side of 1 m or more and a very large display screen such as one wall to promote, conference, or lecture. It can be used for meetings and briefings.
In the above description, the advertisement image data storage unit 52 and the QR code image data storage unit 53 of FIG. 1 are formed separately in the RAM 50. However, when the advertisement image and the QR code image are formed on one screen, Alternatively, the QR code image may be recognized and cut out from the advertisement image, and the size of only the cut out QR code image may be controlled.

  In the above description, the first photographing unit 60, the second photographing unit 70, and the image analysis are performed in order to measure the distance between the display unit 20 and the person watching the advertisement image, or the participants such as the video conference, the lecture, and the explanatory meeting. Although the unit 80 is used, instead of these, infrared or red light is emitted toward a person watching an advertisement image or a participant such as a video conference, a lecture, a briefing session, and the reflected light is measured. Thus, the distance to the display unit 20 may be measured. Further, the distance from the display unit 20 may be measured using ultrasonic waves. Furthermore, the distance to the in-focus position may be measured using the camera focusing function. In this case, a plurality of light sources emitting infrared light or red light, or ultrasonic sources generating ultrasonic waves are arranged in the vicinity of the display unit 20, and the reflected light from the plurality of light sources is detected. Accurate distance can be measured.

  In the above description, when there are a plurality of persons in front of the display unit 20, the person U in front of the display unit 20 is selected, and the size of the QR code displayed in front of the person U in front is displayed. Controlled. However, when there are a plurality of persons U in front of the display unit 20, QR codes are displayed in front of the plurality of persons U, and the distances between the persons are measured from the QR codes displayed on the display unit 20. The size of the QR code may be controlled.

It is a block diagram which shows the structure of the information display apparatus of this invention. It is a figure explaining the method to measure the distance from the display part used for the information display apparatus of this invention to a person. It is a figure explaining the principle of the stereo method used for the information display apparatus of this invention. It is a figure which shows the example of a display of the advertisement image displayed by the information display apparatus of this invention, a document image, and QR code. FIG. 5 is a flowchart showing a process in which the information display device of the present invention develops advertisement data and QR code image data on a memory, combines the images, and transfers the display data to the display unit 20. It is a flowchart figure which shows the process in which the information display apparatus of this invention calculates | requires the display magnification of QR Code.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Information display apparatus 10 Control part 20 Display part 30 Audio | voice output part 40 ROM
50 RAM
60 First imaging unit 70 Second imaging unit 80 Image analysis unit 90 HDD

Claims (7)

An information display device for displaying an optically readable image by an external device,
A display unit for displaying an image on the display screen;
A display image storage unit for storing variable display image information to be displayed in a variable size on the display screen;
A distance measuring unit for measuring a distance from the display screen to the external device;
A display magnification control unit for controlling the display magnification of the variable display image according to the distance measured by the distance measurement unit;
An information display device comprising: a display driving unit configured to display the variable display image on the display screen in a size controlled by the display magnification control unit.   The external device is a photographing camera, and the display magnification control unit selects a photographing camera located in front of the variable display image displayed on the display screen when there are a plurality of the photographing cameras, and the display screen The information display apparatus according to claim 1, wherein a display magnification of the variable display image is controlled according to a distance from the selected photographing camera to a distance.   3. The display magnification control unit displays the variable display image in a preset size when the distance measurement unit cannot measure the distance from the display screen to the photographing camera. The information display device described in 1.   The distance measuring unit includes a plurality of cameras provided in the vicinity of the display unit, processes images captured by the plurality of cameras by a stereo method, and obtains a distance from the display screen to the imaging camera. The information display device described in 1.   The information display device according to claim 1, wherein the variable display image is an image including at least one of a one-dimensional barcode, a two-dimensional barcode, a QR code, a numeric image, a character image, a picture, or an illustration.   The display image storage unit further stores fixed display image information to be displayed in a predetermined size on the display screen, and the display drive unit combines the variable display image with the display magnification controlled and the fixed display image. The information display device according to claim 1 for displaying. A display image storage unit for storing a variable display image to be displayed in a variable size on the display screen;
A distance measuring step for measuring a distance from the display screen to a photographing camera for photographing the variable display image displayed on the display screen;
A display magnification control step for controlling a display magnification of the variable display image according to the measured distance;
And a display driving step of displaying the variable display image on the display screen in a size in which the display magnification is controlled.