JP7502647B2 - Information code display terminal and program - Google Patents

Description

The present invention relates to an information code display terminal and a program for displaying information codes.

Conventionally, there is known a technique for displaying an information code on a display terminal such as a mobile phone, and having a reader optically read this information code, thereby causing the reader to perform processing according to the information code. For example, an entrance management system has been proposed in which an information code serving as an entrance ticket is displayed on a display terminal carried by a user, and this information code is read by a reader installed at the entrance gate, thereby permitting the user to enter.

Information codes used as admission tickets, etc., have the problem that they are easily illegally copied by voyeurism, etc. For this reason, for example, in the information code reading system disclosed in the following Patent Document 1, the reading device emits light in a predetermined light-emitting state, and this predetermined light-emitting state is imaged by the information code display terminal, and the information code is displayed on the information code display terminal. In this way, by displaying the information code only when the predetermined light-emitting state is detected, it is possible to prevent copying of the information code displayed on the information code display terminal.

JP 2017-107413 A

However, in the configuration described above where the information code is displayed only when the light emission state is detected, the information code is not displayed on the information code display terminal until the light emission state is detected. As a result, when the display screen is facing the user, i.e., when the user is looking at the display screen, the information code is not displayed on the display screen, so the user must hold the display screen without the information code over the reading device. In this way, while it is necessary to hold the display screen without the information code over the reading device, the user cannot see the information code himself, so even if the reading device fails to read the information code, there are cases where the user is unable to understand the reason for the failure, which has been an obstacle to implementation.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a configuration capable of displaying an information code that is visible to the user and difficult to photograph secretly.

In order to achieve the above object, the invention described in claim 1 of the claims is as follows:
An information code display terminal (10) capable of displaying an information code (C),
A housing (11);
a display unit (24) provided on one surface (12) of the housing with a display screen (24a) for displaying the information code;
An imaging section (23) having an imaging direction in which the one surface is oriented;
a determination unit (21) that determines whether or not a predetermined imaging state is reached in which the information code should be hidden based on an imaging result by the imaging unit;
A display control unit (21) for controlling a display state of the display unit;
Equipped with
the determination unit determines that the predetermined imaging state exists when a ratio (R) of the camera lens to the captured image detected from the captured image of the imaging unit is equal to or smaller than a predetermined ratio (Rth) and a relative moving speed (V) of the camera lens to the information code display terminal obtained from a plurality of the captured images is equal to or smaller than a predetermined speed (Vth);
The display control unit controls the display unit to hide the information code that has been displayed on the display screen when the determination unit determines that the image capturing state is the predetermined image capturing state.

The invention described in claim 2 is
An information code display terminal (10) capable of displaying an information code (C),
A housing (11);
a display unit (24) provided on one surface (12) of the housing with a display screen (24a) for displaying the information code;
An imaging section (23) having an imaging direction in which the one surface is oriented;
a determination unit (21) that determines whether or not a predetermined imaging state is reached in which the information code should be hidden based on an imaging result by the imaging unit;
A display control unit (21) for controlling a display state of the display unit;
an acceleration sensor (26) for detecting the acceleration of the information code display terminal;
Equipped with
the determination unit determines that the information code display terminal is in the predetermined imaging state when a camera lens is detected from an image captured by the imaging unit and a stationary state of the information code display terminal is detected from a detection result of the acceleration sensor,
The display control unit controls the display unit to hide the information code that has been displayed on the display screen when the determination unit determines that the image capturing state is the predetermined image capturing state.

The invention described in claim 3 is
A program executed by a computer (21) that controls an information code display terminal (10) capable of displaying an information code (C),
displaying the information code on a display screen (24a) provided on one surface (12) of the housing (11);
a step of determining that the imaging state is a predetermined imaging state in which the information code should be hidden when a ratio (R) of the camera lens in an image captured by an imaging unit (23) having an imaging direction in the direction in which the one surface is facing is equal to or less than a predetermined ratio (Rth) and a relative moving speed (V) of the camera lens with respect to the information code display terminal, which is obtained from a plurality of the captured images, is equal to or less than a predetermined speed (Vth);
a step of hiding the information code that has been displayed on the display screen when the image capturing state is determined to be the predetermined image capturing state;
The present invention is characterized in that the computer is caused to execute the above steps.

The invention described in claim 4 is
A program executed by a computer (21) that controls an information code display terminal (10) capable of displaying an information code (C),
displaying the information code on a display screen (24a) provided on one surface (12) of the housing (11);
a step of determining that the information code display terminal is in a predetermined imaging state in which the information code should be hidden when a camera lens is detected from an image captured by an imaging section (23) whose imaging direction is the direction in which the one surface is directed, and when a stationary state of the information code display terminal is detected from a detection result of an acceleration sensor (26);
a step of hiding the information code that has been displayed on the display screen when the image capturing state is determined to be the predetermined image capturing state;
The present invention is characterized in that the computer is caused to execute the above steps.
The symbols in parentheses above indicate the corresponding relationship with the specific means described in the embodiments described later.

In the invention of claim 1, a display screen of a display unit for displaying an information code is provided on one side of a housing, and an imaging unit is provided with an imaging direction in the direction in which this one side is facing. Then, when the ratio of the camera lens in the captured image detected from the captured image of the imaging unit is equal to or less than a predetermined ratio, and the relative moving speed of the camera lens with respect to the information code display terminal determined from the multiple captured images is equal to or less than a predetermined speed, the determination unit determines that the imaging state is a predetermined state in which the information code should be hidden, and the display control unit controls the display unit to hide the information code that was displayed on the display screen.

When the information code displayed on one side of the housing is secretly photographed with a smartphone or the like, the camera lens for the secret photograph is kept away from the information code display terminal within an imageable range and is maintained pointed toward the information code. This is because if the camera lens is close to the information code display terminal, the secret photograph will be discovered, and it is necessary to bring the camera lens relatively close to the information code display terminal in order to capture an image that can be decoded from a relatively long distance. On the other hand, when the reader legitimately captures the information code displayed on one side of the housing, the camera lens of the reader is in a state where it is relatively close to the information code display terminal or moves relatively to the information code until it is brought close to the reader. For this reason, when the ratio of the camera lens detected from the captured image to the captured image is equal to or less than a predetermined ratio and the relative moving speed of the camera lens is equal to or less than a predetermined speed, it is determined that the camera lens for the secret photograph is being photographed and that the above-mentioned predetermined imaging state is established, and the information code is hidden, thereby preventing the information code from being secretly photographed. Then, when the user looks at the displayed information code, the above-mentioned predetermined imaging state is not determined, and the information code is maintained in a state where it can be seen. This makes it possible to realize an information code display terminal that can display an information code that is visible to the user and difficult to capture secretly.

In the invention of claim 2, a display screen of a display unit for displaying an information code is provided on one side of the housing, and an imaging unit is provided with an imaging direction in which the one side is facing. When a camera lens is detected from an image captured by the imaging unit, if the stationary state of the information code display terminal is detected from the detection result of the acceleration sensor, the determination unit determines that the imaging state is a predetermined imaging state in which the information code should be hidden, and the display control unit controls the display unit to hide the information code that was displayed on the display screen.

When the reading device legitimately captures an image of the information code displayed on one side of the housing, the information code display terminal moves in order to hold the display screen of the information code display terminal over the reading device, and the moving state of the information code display terminal is detected from the detection result of the acceleration sensor. On the other hand, when a camera lens is captured by an information code display terminal whose stationary state is detected from the detection result of the acceleration sensor, it can be determined that the terminal having the camera lens has entered the imaging range of the information code display terminal and is making a movement to secretly capture the displayed information code. Therefore, when a camera lens is detected from the captured image, if the stationary state of the information code display terminal is detected from the detection result of the acceleration sensor, it is determined that the camera lens for secret photography has been captured and that the above-mentioned specified imaging state is present, and the information code is made invisible, thereby preventing the information code from being secretly photographed. Then, when the user looks at the displayed information code, the above-mentioned specified imaging state is not determined, and the information code is maintained in a state in which it can be seen. Therefore, it is possible to realize an information code display terminal that can display an information code that is visible to the user and difficult to be secretly photographed.

According to the third aspect of the present invention, a program that provides the same effects as the first aspect can be realized.
According to the fourth aspect of the present invention, a program that provides the same effects as those of the second aspect can be realized.

4 is an explanatory diagram illustrating a state in which an information code displayed on the mobile terminal according to the first embodiment is held over a reading device. FIG. 2 is an explanatory diagram illustrating a state in which an information code is displayed on the display screen of the mobile terminal of FIG. 1 . FIG. 2 is a block diagram illustrating a schematic electrical configuration of the mobile terminal of FIG. 1; FIG. 2 is a plan view of the reading device of FIG. 1; 2 is a block diagram illustrating a schematic electrical configuration of the reading device of FIG. 1; 10 is a flowchart illustrating a flow of an information code display process performed on the mobile terminal in the first embodiment. FIG. 7(A) is an explanatory diagram illustrating an example of an image captured by the camera lens of a reading device, and FIG. 7(B) is an explanatory diagram illustrating another example of an image captured by the camera lens of a reading device. FIG. 8(A) is an explanatory diagram illustrating an example of an image captured by the camera lens of a voyeurism terminal, and FIG. 8(B) is an explanatory diagram illustrating another example of an image captured by the camera lens of a voyeurism terminal. 13 is a flowchart illustrating the flow of an information code display process performed on a mobile terminal in a second embodiment.

[First embodiment]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which an information code display terminal of the present invention is applied to a mobile terminal will be described below with reference to the drawings.
The mobile terminal 10 according to this embodiment is configured as a mobile information code display terminal capable of displaying an information code in response to an operation by a user and capable of preventing unauthorized photographing of the information code.

The mobile terminal 10 shown in Figures 1 and 2 is configured by installing an application program (hereinafter also referred to as an information code display application) for generating and displaying an information code C in which predetermined confidential information is recorded on a portable information processing terminal such as a smartphone carried by a user. The outer hull of this mobile terminal 10 is formed by a housing 11 formed in a substantially thin plate shape, and a display screen 24a capable of displaying the information code C is disposed in the center of the surface 12 of the housing 11. By holding the information code C displayed on this display screen 24a over a reading device 30, processing is performed according to the predetermined confidential information read by the reading device 30.

As shown in FIG. 3, the mobile terminal 10 mainly includes a control unit 21 consisting of a CPU or the like, a storage unit 22 consisting of a ROM, RAM, non-volatile memory, etc., an imaging unit 23 configured as a camera equipped with a light receiving sensor (e.g., a C-MOS area sensor, a CCD area sensor, etc.), a touch panel display unit 24, an operation unit 25 that outputs signals to the control unit 21 in response to touch operations on the touch panel and operations on various operation keys, an acceleration sensor 26, and a communication unit 27 configured as a communication interface capable of wireless or wired communication with external devices.

The imaging unit 23 is configured to capture an image of the outside through an imaging window 23a provided near the display screen 24a on the surface 12 of the housing 11. In other words, the imaging unit 23 is configured to function as an in-camera whose imaging direction is the direction in which the surface 12 (display screen 24a) is facing. The surface 12 can be an example of "one side."

The acceleration sensor 26 is a known three-axis acceleration sensor (three-axis motion sensor) capable of detecting acceleration in three axial directions, and is configured to detect acceleration in each of the X-axis, Y-axis, and Z-axis directions, and output an acceleration signal according to the detection results to the control unit 21.

In the mobile terminal 10 configured in this manner, when the information code C is to be displayed on the display screen 24a of the display unit 24, the information code display application is launched, and the control unit 21 starts the information code display process. In this information code display process, an information code C that records predetermined confidential information to be read by the reading device 30 is generated and displayed on the display screen 24a, and then, in order to prevent surreptitious photography of the information code C, if it is determined based on the imaging result by the imaging unit 23 that the information code C is in a predetermined imaging state in which it should be hidden, the information code C is hidden. This information code display process will be described later.

Next, the reader 30 that optically reads the information code C displayed on the display screen 24a of the mobile terminal 10 will be described in detail with reference to FIGS.
The reading device 30 in this embodiment is a stationary information code reading device that optically reads information codes such as QR codes (registered trademark) and bar codes, and is installed in stores and the like that provide specified services using the results of reading the information codes.

As shown in FIG. 5, the reading device 30 includes a control unit 31 consisting of a CPU, a storage unit 32 consisting of ROM, RAM, non-volatile memory, etc., an imaging unit 33, a display unit 34 consisting of a liquid crystal display or the like, a light emitting unit 35 consisting of an LED or the like, an operation unit 36 consisting of various operation keys (not shown), and a communication unit 37 consisting of a communication interface for performing wired or wireless communication with an external device such as a higher-level terminal.

The imaging unit 33 is configured as a camera equipped with an area sensor (not shown) in which solid-state imaging elements such as C-MOS or CCD are arranged two-dimensionally, and a camera lens (imaging lens) 33a. This imaging unit 33 is disposed inside the housing 38 so as to capture an image of the upper side through a reading port 39 provided in the center of the top surface of the housing 38 that constitutes the outer shell of the reading device 30. In this embodiment, as shown in FIG. 4, the camera lens 33a of the imaging unit 33 is viewed as being circular through the reading port 39.

In the reading device 30 configured in this manner, the control unit 31 performs a reading process to perform a known decoding process on the image of the information code captured by the imaging unit 33 through the reading port 39, thereby reading the information recorded in the information code. When the information code C displayed on the mobile terminal 10 is imaged as described above, the predetermined confidential information recorded in the information code C is read.

Next, the information code display process performed by the control unit 21 in the mobile terminal 10 to prevent the information code C from being secretly photographed by a secret photography terminal such as a smartphone other than the reading device 30 when the information code C displayed on the display screen 24a of the mobile terminal 10 is read by the reading device 30 will be described below.

In this embodiment, when the ratio of the camera lens detected from the image captured by the imaging unit 23 to the captured image is equal to or less than a predetermined ratio, and the relative moving speed of the camera lens with respect to the mobile terminal 10 is equal to or less than a predetermined speed, it is determined that the above-mentioned predetermined imaging state is one in which the information code C should not be displayed.

When secretly photographing the information code C displayed on the display screen 24a with a secret photography terminal, the camera lens of the secret photography terminal is kept away from the mobile terminal 10 within an image capturing range and is maintained pointed at the information code C. This is because if it is too close to the mobile terminal 10, the secret photography will be discovered, and it is necessary to bring the terminal relatively to a stationary state in order to capture an image that can be decoded from a relatively long distance. On the other hand, when the reading device 30 legitimately photographs the information code C displayed on the display screen 24a, the camera lens 33a of the reading device 30 is brought relatively close to the mobile terminal 10, or moves relatively until the information code C is brought close to the reading device 30.

For this reason, in the information code display process of this embodiment, if the ratio of the camera lens detected from the captured image to the captured image while the information code C is being displayed is equal to or less than a predetermined ratio, and the relative movement speed of the camera lens is equal to or less than a predetermined speed, it is determined that the camera lens used for voyeurism is being captured, and the above-mentioned predetermined imaging state is reached, and the information code C is made invisible, thereby preventing voyeurism of the information code C.

In particular, in this embodiment, assuming that the voyeur terminal is a smartphone, if a smartphone is captured in a captured image, it is determined whether or not the smartphone's camera lens is captured in the captured image. Specifically, a model for detecting a smartphone from a captured image (hereinafter also referred to as a first detection model) and a model for detecting a camera lens from an image range occupied by the detected smartphone (hereinafter also referred to as a second detection model) are prepared in advance, and the camera lens is detected using these models. The first detection model is a model generated from a large number of images of various types of smartphones that are commonly in circulation, captured from various directions, and the second detection model is a model generated from a large number of images of the camera lens portion of the above-mentioned various types of commonly in circulation smartphones, captured from various directions.

Hereinafter, the information code display process performed by the control unit 21 functioning as a display control unit in this embodiment will be described in detail with reference to the flowchart shown in FIG.
When the information code display application is started in response to a predetermined operation on the operation unit 25, the control unit 21 starts the information code display process, and the display process shown in step S101 of Fig. 6 is performed, and the information code C is displayed on the display screen 24a of the display unit 24 (see Fig. 2). The information code C displayed on the screen may be generated in advance and stored in the storage unit 22, or may be generated each time.

Next, the imaging process shown in step S103 is performed, and the imaging unit 23 captures an image of the direction in which the surface 12 is facing, i.e., the direction in which the information code C is facing. Next, in the judgment process of step S105, it is determined whether or not a camera lens is detected from the image captured by the imaging unit 23. If the smartphone is not detected from the captured image using the first detection model, the judgment process of step S105 returns No as the camera lens is not detected, and the process from step S101 is repeated. Also, even if the smartphone is detected from the captured image using the first detection model, if the camera lens is not detected from the image range in which the smartphone is detected using the second detection model, the judgment process of step S105 returns No, and the process from step S101 is repeated.

Therefore, the display process of the information code C and the image capture process of the direction in which the information code C is pointed continue until the camera lens of the smartphone is detected. In this processing state, as illustrated in Figures 7(A) and 7(B), even if the camera lens 33a of the reading device 30 is captured, the judgment process of step S105 returns No and the display of the information code C is maintained, so that the information code C can be captured by the reading device 30.

On the other hand, when the smartphone's camera lens L1 is imaged as shown in FIG. 8(A) or when the smartphone's camera lens L2 is imaged as shown in FIG. 8(B), the smartphone is detected from the captured image using the first detection model, and the camera lens is detected from the image range in which the smartphone is detected using the second detection model (Yes in S105), and the image is stored in the memory unit 22 (S107).

Next, a lens ratio calculation process shown in step S109 is performed, and the ratio of the lens (hereinafter also referred to as lens ratio R) in the captured image of the camera lens detected as described above is calculated. Then, in a judgment process shown in step S111, it is judged whether the lens ratio R calculated as described above is equal to or less than a predetermined ratio Rth. In this embodiment, the predetermined ratio Rth is set to, for example, 1%, and if the calculated lens ratio R is not equal to or less than the predetermined ratio Rth because the camera lens is captured relatively large, the judgment process in step S111 is judged as No, and the process from step S101 is repeated.

On the other hand, when the lens ratio R calculated as described above becomes equal to or less than the predetermined ratio Rth (Yes in S111), the lens relative movement speed calculation process shown in step S113 is performed. In this process, the relative movement speed (hereinafter also referred to as movement speed V) of the camera lens with respect to the mobile terminal 10 is calculated from the successive images of the camera lens (a predetermined number or more of images captured in succession) stored in the memory unit 22. Specifically, since the frame rate of the imaging unit 23 is constant, for example, the center coordinate of the camera lens in each successive image can be found, and the movement speed V can be calculated from the movement distance between each image of the center coordinate.

When the moving speed V is calculated as described above, in the judgment process of step S115, it is judged whether or not the detected camera lens is stationary relative to the mobile terminal 10. Here, if the calculated moving speed V exceeds a predetermined speed Vth and it is judged that the camera lens is clearly moving relative to the mobile terminal 10, the result is No in step S115, and the processes from step S101 are repeated. Note that the control unit 21 that performs the judgment process of step S111 and the judgment process of step S115 may correspond to an example of a "judgment unit" that judges whether or not a predetermined imaging state in which the information code C should be hidden is reached, based on the imaging result by the imaging unit 23.

On the other hand, when the moving speed V calculated as described above becomes equal to or lower than the predetermined speed Vth, it is determined that the detected camera lens is stationary relative to the mobile terminal 10, and the determination process of step S115 is Yes. In this case, the information code non-display process shown in step S117 is performed, and the information code C displayed on the display screen 24a becomes non-displayed. In other words, when the lens ratio R of the detected camera lens in the captured image is equal to or lower than the predetermined ratio Rth, and the moving speed V of the camera lens becomes equal to or lower than the predetermined speed Vth, it is determined that the image capture state is a predetermined image capture state in which the information code C should be hidden, and the information code C becomes non-displayed.

As described above, in the mobile terminal 10 according to this embodiment, the display screen 24a of the display unit 24 for displaying the information code C on the surface 12 of the housing 11 is provided, and the imaging unit 23 is provided with an imaging direction in the direction in which the surface 12 is facing. When the lens ratio R of the camera lens in the captured image detected from the captured image of the imaging unit 23 is equal to or less than a predetermined ratio Rth, and the relative moving speed V of the camera lens with respect to the mobile terminal 10 obtained from the multiple captured images is equal to or less than a predetermined speed Vth, it is determined that the imaging state is a predetermined state in which the information code C should not be displayed, and the display unit 24 is controlled to hide the information code C that was displayed on the display screen 24a.

That is, the steps of displaying the information code C on the display screen 24a provided on the surface 12 of the housing 11 by the information code display app, determining that the imaging state is a predetermined imaging state in which the information code C should be hidden when the lens ratio R of the camera lens in the captured image detected from the captured image of the imaging unit 23, whose imaging direction is the direction in which the surface 12 is facing, is equal to or less than a predetermined ratio Rth and the relative moving speed V of the camera lens with respect to the mobile terminal 10 obtained from the multiple captured images is equal to or less than a predetermined speed Vth, and hiding the information code C that was displayed on the display screen 24a due to the determination that the imaging state is the predetermined imaging state are executed by the control unit 21 functioning as a computer that controls the mobile terminal 10 capable of displaying the information code C.

In this way, when the lens ratio R of the camera lens detected from the captured image to the captured image is equal to or less than a predetermined ratio Rth, and the relative movement speed V of the camera lens is equal to or less than a predetermined speed Vth, it is determined that the camera lens for voyeurism is being captured and that the above-mentioned predetermined imaging state is present, and the information code C is made invisible, thereby preventing voyeurism of the information code C. Then, when the user looks at the displayed information code C, it is not determined that the above-mentioned predetermined imaging state is present, and the information code C remains visible. Therefore, it is possible to realize a mobile terminal (information code display terminal) 10 that can display an information code C that is visible to the user and difficult to capture voyeuristically.

[Second embodiment]
Next, a mobile terminal to which an information code display terminal according to a second embodiment of the present invention is applied will be described with reference to the drawings.
The second embodiment is different from the first embodiment in that the detection result by the acceleration sensor is used to determine whether or not the image capturing state is a predetermined state in which the information code should not be displayed. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof will be omitted.

In this embodiment, in the information code display process performed by the control unit 21, when a camera lens is detected from the image captured by the imaging unit 23, and the detection result of the acceleration sensor 26 detects that the mobile terminal 10 is stationary, it is determined that the imaging state is a specified state in which the information code C should not be displayed.

When the reading device 30 legitimately captures the information code C displayed on the surface 12 of the housing 11, the mobile terminal 10 moves in order to hold the display screen 24a of the mobile terminal 10 over the reading device 30, and the moving state of the mobile terminal 10 is detected from the detection result of the acceleration sensor 26. On the other hand, when a camera lens is captured by the mobile terminal 10 whose stationary state is detected from the detection result of the acceleration sensor 26, it can be determined that the terminal having the camera lens has entered the imaging range of the mobile terminal 10 and is making a movement to secretly capture the displayed information code C. Therefore, when a camera lens is detected from the captured image, if the stationary state of the mobile terminal 10 is detected from the detection result of the acceleration sensor, it is determined that the above-mentioned predetermined imaging state is being taken as the camera lens for secret photography, and the information code C is made invisible, thereby preventing the information code C from being secretly photographed. In this embodiment, the mobile terminal 10 is detected to be in a stationary state when the movement speeds in each of the three axial directions obtained from the detection result of the acceleration sensor are all equal to or less than a predetermined speed.

Hereinafter, the information code display process performed by the control unit 21 functioning as a display control unit in this embodiment will be described in detail with reference to the flowchart shown in FIG.
As in the first embodiment, if the smartphone is not detected from the captured image using the first detection model, or if the smartphone is detected from the captured image using the first detection model but the camera lens is not detected from the image range in which the smartphone is detected using the second detection model, the determination of No is repeated in step S105 of Fig. 9. In such cases, the state in which the information code C is displayed on the display screen 24a of the display unit 24 (S101) and the state in which the image is captured in the direction in which the information code C is pointed (S103) are maintained.

When the smartphone is detected from the captured image using the first detection model and the camera lens is detected from the image range in which the smartphone is detected using the second detection model (Yes in S105), a determination is made in step S119 as to whether or not the stationary state of the mobile terminal 10 is detected from the detection result of the acceleration sensor 26. Here, if the moving state of the mobile terminal 10 is detected from the detection result of the acceleration sensor 26 (if the stationary state is not detected), the determination is No in step S119, and it is determined that the user is pointing the display screen 24a of the mobile terminal 10 toward the reading port 39 of the reading device 30, and the state in which the information code C is displayed on the display screen 24a of the display unit 24 continues (S101).

On the other hand, if the mobile terminal 10 is detected as stationary from the detection result of the acceleration sensor 26 after the determination in step S105 is No, the determination in step S119 is Yes, and as described above, the information code C is placed in a hidden state as a predetermined imaging state in which the information code C should not be displayed.

As described above, in the mobile terminal 10 according to this embodiment, the display screen 24a of the display unit 24 for displaying the information code C on the surface 12 of the housing 11 is provided, and the imaging unit 23 is provided with an imaging direction in the direction in which the surface 12 is pointed. When the camera lens is detected from the image captured by the imaging unit 23, if the detection result of the acceleration sensor 26 detects that the mobile terminal 10 is stationary, it is determined that the imaging state is a specified state in which the information code C should be hidden, and the display unit 24 is controlled to hide the information code C that was displayed on the display screen 24a.

That is, the following steps are executed by the control unit 21, which functions as a computer that controls the mobile terminal 10 capable of displaying the information code C: displaying the information code C on the display screen 24a provided on the surface 12 of the housing 11 using an information code display app; determining that the mobile terminal 10 is in a specified imaging state in which the information code C should be hidden if the mobile terminal 10 is detected to be in a stationary state from the detection result of the acceleration sensor 26 when a camera lens is detected from an image captured by the imaging unit 23, whose imaging direction is the direction in which the surface 12 is pointed; and hiding the information code C that was displayed on the display screen 24a when the specified imaging state is determined to be present.

In this way, when a camera lens is detected from the captured image, if the detection result of the acceleration sensor 26 detects that the mobile terminal 10 is stationary, it is determined that the camera lens for voyeurism has been captured and that the above-mentioned specified imaging state is met, and the information code C is made invisible, thereby preventing voyeurism of the information code C. Then, when the user looks at the displayed information code C, it is not determined that the above-mentioned specified imaging state is met, and the information code C remains visible. Therefore, it is possible to realize a mobile terminal (information code display terminal) 10 that can display an information code C that is visible to the user and difficult to voyeurize.

The present invention is not limited to the above-described embodiments, and may be embodied as follows, for example.
(1) The information code C displayed on the display screen 24a of the mobile terminal 10 is generated as a QR code so that predetermined secret information is recorded, but is not limited to this and may be generated as other types of information code, for example, a two-dimensional code such as a data matrix code or a maxicode, or a one-dimensional code such as a barcode. Furthermore, the information code C may be further encrypted to improve security.

(2) The present invention is not limited to being applied to a smartphone on which the above-mentioned information code display app is installed, but may also be applied, for example, to a mobile terminal for business use on which a program equivalent to the above-mentioned information code display app is installed.

10...Mobile terminal (information code display terminal)
11... Housing 12... Surface (one side)
21...Control unit (determination unit, display control unit, computer)
23: Imaging section 23a: Imaging window 24: Display section 24a: Display screen 26: Acceleration sensor C: Information code R: Lens ratio Rth: Predetermined ratio V: Travel speed Vth: Predetermined speed

Claims (4)

An information code display terminal capable of displaying an information code,
A housing and
a display unit having a display screen for displaying the information code on one surface of the housing;
an imaging unit whose imaging direction is the direction in which the one surface is oriented;
a determination unit that determines whether or not a predetermined imaging state is reached in which the information code should be hidden based on an imaging result by the imaging unit;
A display control unit that controls a display state of the display unit;
Equipped with
the determination unit determines that the predetermined imaging state exists when a ratio of the camera lens detected from an image captured by the imaging unit to the captured image is equal to or smaller than a predetermined ratio and a relative moving speed of the camera lens with respect to the information code display terminal obtained from a plurality of the captured images is equal to or smaller than a predetermined speed;
The display control unit controls the display unit to hide the information code that was displayed on the display screen when the determination unit determines that the specified imaging state is reached. An information code display terminal capable of displaying an information code,
A housing and
a display unit having a display screen for displaying the information code on one surface of the housing;
an imaging unit whose imaging direction is the direction in which the one surface is oriented;
a determination unit that determines whether or not a predetermined imaging state is reached in which the information code should be hidden based on an imaging result by the imaging unit;
A display control unit that controls a display state of the display unit;
an acceleration sensor for detecting an acceleration of the information code display terminal;
Equipped with
the determination unit determines that the information code display terminal is in the predetermined imaging state when a camera lens is detected from an image captured by the imaging unit and a stationary state of the information code display terminal is detected from a detection result of the acceleration sensor,
The display control unit controls the display unit to hide the information code that was displayed on the display screen when the determination unit determines that the specified imaging state is reached. A program executed by a computer that controls an information code display terminal capable of displaying an information code,
displaying the information code on a display screen provided on one side of a housing;
determining that the imaging state is a predetermined state in which the information code should be hidden when a ratio of the camera lens detected from an image captured by an imaging unit whose imaging direction is the direction in which the one surface is facing to the captured image is equal to or less than a predetermined ratio and a relative moving speed of the camera lens with respect to the information code display terminal, which is determined from a plurality of the captured images, is equal to or less than a predetermined speed;
a step of hiding the information code that has been displayed on the display screen when the image capturing state is determined to be the predetermined image capturing state;
A program for causing the computer to execute the above. A program executed by a computer that controls an information code display terminal capable of displaying an information code,
displaying the information code on a display screen provided on one side of a housing;
a step of determining that the information code display terminal is in a predetermined imaging state in which the information code should not be displayed when a camera lens is detected from an image captured by an imaging unit whose imaging direction is the direction in which the one surface is facing and when a stationary state of the information code display terminal is detected from a detection result of an acceleration sensor;
a step of hiding the information code that has been displayed on the display screen when the image capturing state is determined to be the predetermined image capturing state;
A program for causing the computer to execute the above.

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