JP2007163864A - Display control apparatus, display control method, display control program, and display control program recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display control apparatus, a display control method, a display control program, and a display control program recording medium, in which the display of a screen can be automatically controlled so that an unauthorized user can not view the screen. <P>SOLUTION: The display control apparatus is provided with: an identification part 30 for identifying a person; a determination part 40 for comparing read authorization information for regulating an authorized user who is allowed to browse the contents of a file displayed on a display apparatus 2 with an identification result to determine whether the person is authorized or not; a distance calculation part 51 for calculating a distance between the person's position and the display apparatus 2; and a size changing part 52 for referring to character size information indicating relation between the distance and a minimum readable character size and changing the size of characters displayed on the display device 2 in accordance with the distance when the person is not authorized. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a control device for a display device, and more particularly to a display control device for a display device that displays characters on a screen, a display control method, a display control program, and a display control program recording medium.

  Conventionally, hiding the contents (characters, etc.) of files that are displayed on a screen attached to a personal computer (PC) and that are not desired to be seen by others is that the PC user must manually use his / her mouse, keyboard, etc. Is going. For example, the user turns off the power of the display device, turns off the screen display, minimizes the screen display, displays another screen, and the like.

  By the way, in recent years, research on measurement techniques for measuring a person, line of sight, face orientation, and the like based on image information has been vigorously conducted. For example, a method has been proposed in which a person's position is extracted by real-time measurement, for example, every 33 [ms] using a plurality of omnidirectional cameras and an active camera (see Non-Patent Document 1). In addition, a method of measuring a person's line of sight in real time based on the corneal reflection method has been proposed (see Non-Patent Document 2). Furthermore, a method has been proposed in which facial feature points are tracked by distance information obtained by a stereo camera and an image processing method, and the orientation of a person's face is measured in real time (see Non-Patent Document 3). The above technique is used as a human interface or a tool for analysis of cognitive science and psychology. For example, in order to provide a safe driving environment, a method for analyzing whether the driver's line-of-sight direction changes while driving and determining whether the driver is concentrating on a mobile phone call has been proposed. (See Non-Patent Document 4).

Furthermore, in recent years, research on biometric personal identification technology has become active. Biometric identification is a technique for identifying individuals based on biometric features such as faces, fingerprints, irises and veins. Among the biometric personal identification technologies, the facial identification technology is (1) no special device is required, and a camera or the like that has already been widely used can be used. There are advantages such as low resistance. Therefore, face recognition technology has been studied by various research institutions. For example, a personal identification method using major facial organs such as eyes, nose and mouth as feature points has been proposed (see Non-Patent Document 5).
Yutaro Aoki, Motoki Doi, “Self-living elderly monitoring system using multiple omnidirectional image sensors and active cameras”, Proceedings of the 46th Annual Conference of the Institute of Systems, Control and Information Engineers, 2003, p. 1212-1215 Takehiko Ohno, Naoki Takekawa, Atsushi Yoshikawa, “Gaze Measurement System Realizing Simple Calibration by Two-Point Correction”, Transactions of Information Processing Society of Japan, 2003, Vol. 44, no. 4, p. 1136-1149 Lois-Philippe, et al., “Adaptive View-based Appearance Models”, American Association of Telecommunications Engineers Conference and Computer Vision. Pattern Recognition (Computer Recognition on Computer Vision and Pattern Recognition), 2003, p. 803-810 Osamu Yamaguchi and Kazuhiro Fukui, “Robust Face Recognition System“ Smart Face ”for Changes in Face Orientation and Facial Expressions”, Proceedings of the 11th Image Sensing Symposium, 2005, p. 77-80 Kenichi Takahashi, Noriaki Nakano and Shin Yamamoto, “Examination of Detection of Thinking Concentration by Mobile Communication Using Image Processing”, Journal of Information Processing Society of Japan D-II, 2001, Vol. J84-D-II, no. 6, p. 1045-1052

  However, there is a problem that it is troublesome for the user and lacks convenience to prevent others from seeing the contents of the file displayed on the screen of the PC by the user's manual operation using a mouse or a keyboard. In addition, when the user who is browsing the contents of the file displayed on the screen does not notice that another user is browsing the screen from behind, or when leaving the file while displaying the contents of the file, etc. There is a possibility that a user who is not permitted to browse may view the displayed content, which is a security problem.

  The present invention has been made in view of the above, and a display control device, a display control method, a display control program, and display control that can automatically control display of a screen so that a user who is not permitted to browse cannot view the screen. An object is to provide a program recording medium.

  According to one aspect of the present invention, there is provided a display control device for controlling a display device, the identification means for identifying a person and storing the identification result in the identification result storage means, and the contents of the file displayed on the display device. The browsing permission information and the identification result that specify the browsing-permitted user who is permitted to browse are read from the permission information storage unit and the identification result storage unit, respectively. A determination unit that determines whether or not the determination result is stored in the determination result storage unit, a distance between the position of the person and the display device, and a distance calculation unit that stores the calculation result in the calculation result storage unit; The determination result, the calculation result, and the character size information indicating the relationship between the distance and the minimum readable character size are read from the determination result storage unit, the calculation result storage unit, and the character size information storage unit, respectively. Out, if a person is not the permission user, referring to the character size information, the display control device and a size changing means for changing the size of the displayed characters on the display device in response to there is provided a distance.

  According to another aspect of the present invention, an identification unit, a determination unit, a distance calculation unit, a size change unit, an identification result storage unit, a permission information storage unit, a determination result storage unit, a calculation result storage unit, and a character size information storage unit are provided. A display control method for controlling a display device using a display control device comprising: a step in which an identification unit identifies a person, and an identification result is stored in an identification result storage unit; and a determination unit is displayed on the display device The reading permission information and the identification result for specifying the browsing-permitted user who is permitted to view the contents of the file are read from the permission information storage means and the identification result storage means, respectively, and the person is compared by comparing the browsing permission information and the identification result. A step of determining whether or not the user is a browsing-permitted user and storing the determination result in the determination result storage unit; and a distance calculating unit calculating the distance between the position of the person and the display device. And a step of storing the calculation result in the calculation result storage means, and the size changing means includes a determination result, a calculation result, and character size information indicating a relationship between the distance and the minimum readable character size. Display control including reading each from the storage means and the character size information storage means, and referring to the character size information and changing the size of the character displayed on the display device according to the distance when the person is not a viewing-permitted user A method is provided.

  According to another aspect of the present invention, there is provided a display control program for controlling a display device, wherein the identification means identifies a person and the identification result is stored in the identification result storage means; The browsing permission information and the identification result that specify the browsing-permitted user who is permitted to browse the contents of the displayed file are read from the permission information storage unit and the identification result storage unit, respectively. Comparing to determine whether the person is a browsing-permitted user, storing the determination result in the determination result storage means, and causing the distance calculation means to calculate the distance between the position of the person and the display device, and the calculation result And a command to store the result in the calculation result storage means, and the size change means store the determination result, the calculation result, and character size information indicating the relationship between the distance and the minimum readable character size. If the person is not a browsing-permitted user, the character size information is referred to and the size of the character displayed on the display device is changed according to the distance. A display control program for executing instructions is provided.

  According to another aspect of the present invention, an instruction for causing the identification means to identify a person and storing the identification result in the identification result storage means, and a determination means are permitted to view the contents of the file displayed on the display device. Whether or not the person is a browsing-permitted user by reading the browsing-permitted information and the identification result that specify the browsing-permitted user who is browsing from the permission information storage unit and the identification result storage unit, respectively, and comparing the browsing permission information and the identification result A command for storing the determination result in the determination result storage unit, a command for causing the distance calculation unit to calculate the distance between the position of the person and the display device, and storing the calculation result in the calculation result storage unit, and a size. In the change means, the determination result, the calculation result, and the character size information indicating the relationship between the distance and the minimum readable character size are stored in the determination result storage means, the calculation result storage means, and the character size information storage hand. Stores a display control program for executing a command for referring to character size information and changing the size of characters displayed on the display device according to the distance when the person is not a viewing-permitted user. A display control program recording medium is provided.

  According to the present invention, it is possible to provide a display control device, a display control method, a display control program, and a display control program recording medium that can automatically control display of a screen so that a user who is not permitted to browse cannot browse.

  Next, first and second embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. Further, the following first and second embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is a component part. The structure and arrangement are not specified as follows. The technical idea of the present invention can be variously modified within the scope of the claims.

(First embodiment)
As shown in FIG. 1, the display control apparatus according to the first embodiment of the present invention is a display control apparatus that controls the display apparatus 2, which identifies a person and stores the identification result in an identification result storage area 303. The permission information storage area 302 and the identification result storage area 303 include the identification unit 30 to be stored and the browsing permission information and the identification result that define the browsing-permitted user who is permitted to browse the contents of the file displayed on the display device 2. Are respectively read out, compared with the browsing permission information and the identification result to determine whether or not the person is a browsing-permitted user, the determination unit 40 stores the determination result in the determination result storage area 304, the position of the person and the display device 2, the distance calculation unit 51 that stores the calculation result in the calculation result storage area 305, and the character size information indicating the determination result, the calculation result, and the relationship between the distance and the minimum readable character size Are read from the determination result storage area 304, the calculation result storage area 305, and the character size information storage area 306, respectively, and when the person is not a viewing-permitted user, the character size information is referred to and displayed on the display device 2 according to the distance. And a size changing unit 52 for changing the size of the characters. The “browsing-permitted user” refers to a person who is permitted to view the contents of each file displayed on the display device 2.

  The identification unit 30 includes an imaging unit 31, a person detection unit 32, and an identification unit 33. The imaging unit 31 is a camera or the like and acquires image information. The person detection unit 32 analyzes the image information acquired by the imaging unit 31 and analyzes the acquired image information to detect whether or not person information is included in the image information. That is, the person detection unit 32 detects whether or not there is a person around the display device 2. For example, it is possible to detect whether or not a person exists by using a change area obtained by considering a difference between an unattended background image acquired in advance and image information acquired in real time as an area (person area) where a person exists. . As a method for determining whether or not a person is included in the image information, a known method such as a method for extracting the position of a person by real-time measurement can be employed.

  The “around the display device 2” is a range in which the person detection unit 32 detects a person, and is preset in the person detection unit 32. For example, “around the display device 2” is set as a range in which the imaging unit 31 can shoot. A range in which the person detection unit 32 detects a person can be set on the assumption that the person can read the characters displayed on the display device 2.

  The identification unit 33 refers to registered information registered in advance and identifies a person (hereinafter referred to as “target person”) included in the input image information. For example, the detected person can be identified by comparing the similarity between the face image captured by the imaging unit 31 and the face image included in the registration information. Registration information is registered by a user registration unit 10 described later.

  The distance calculation unit 51 calculates the three-dimensional position of the person photographed by the imaging unit 31 by a method such as stereo matching. Specifically, when the imaging unit 31 is a stereo camera having two cameras, a person area (image coordinates) captured by one camera (for example, the right camera) of the imaging unit 31 and the corresponding imaging The three-dimensional position of the person area is estimated based on the principle of triangulation using the person area photographed by the other camera (for example, the left camera) of the unit 31. Further, a distance (Euclidean distance) between the estimated three-dimensional position and the center coordinates of the screen of the display device 2 is calculated. The distance calculation unit 51 can employ a known distance calculation device. The size changing unit 52 controls the display device 2 to change the size of characters displayed on the display device 2.

  For example, the size changing unit 52 changes the size of the character displayed on the display device 2 to the minimum readable character size for a person around the display device 2. Here, the “minimum readable character size” is, for example, a person described in “JIS standard S0032: 2003 Elderly / disabled person consideration design guideline—visual display object—minimum readable character size estimation method for Japanese characters”. The size of a character that can recognize one character. The minimum readable character size is the distance between the subject and the display device 2, the brightness of the room in which the display device 2 is installed, the age of the subject, the eyesight of the subject, and the character type (Gothic, Mincho, Hiragana, Kanji Etc.) etc.

  As shown in FIG. 1, the distance calculating unit 51 and the size changing unit 52 are included in the control unit 50. The identification unit 30, the determination unit 40, and the control unit 50 are included in the processing device 1. The processing device 1 further includes a user registration unit 10 and a browse permission registration unit 20.

  The user registration unit 10 registers information that can be used for user identification, such as a user's face image, as registration information. The registered registration information is stored in the registration information storage area 301. For example, the user registration unit 10 captures a face image of a browsing-permitted user using the imaging unit 31 or the like. The captured face image is stored in the registration information storage area 301 as registration information. Further, the user registration unit 10 associates information specifying the user such as the user name or user ID of the user corresponding to the face image with the face image and stores the information in the registration information storage area 301. Hereinafter, the information for specifying the user is simply referred to as “user ID”.

  For each file whose contents are displayed on the display device 2, the browsing permission registration unit 20 registers the user ID of the browsing permitted user of the file as browsing permission information. The registered browsing permission information is stored in the permission information storage area 302. For example, the browsing permission registration unit 20 creates a browsing permission list in which user IDs of browsing-permitted users are registered as browsing permission information. The per-file browsing-permitted user can be stored in the permission information storage area 302 via the input device 4 shown in FIG.

  The input device 4 includes a keyboard, a mouse, a light pen, a scanner, a flexible disk device, or the like. A user can input a user ID or the like from the input device 4 or input an instruction to execute or cancel display control.

  The registration information storage area 301, the permission information storage area 302, the identification result storage area 303, the determination result storage area 304, the calculation result storage area 305, and the character size information storage area 306 are included in the storage device 3 shown in FIG.

  The display control device shown in FIG. 1 further includes an output device 5. The output device 5 is an interface to which a recording device that stores data stored in the storage device 3 in a computer-readable recording medium can be connected.

  In FIG. 2, the structural example of the imaging part 31 and the display apparatus 2 is shown. As shown in FIG. 2, an imaging unit 31, which is a stereo camera having two cameras 311 and 312, is mounted on the upper part of the display device 2 having a screen 21. However, the imaging unit 31 may be another type of camera such as a monocular camera.

An example of character size information indicating the relationship between the viewing distance D and the minimum readable character size P is shown in Expression (1). “Viewing distance” is the distance between the user and the screen:

P = 1.75 × D + 4.5 (1)

However, the formula (1) is the minimum readable character size of 5 to 10 kanji characters when the brightness of the room where the display device 2 is installed is 100 [cd / m ² ] and the user is in the 20s. is there. FIG. 3 shows a graph with the vertical axis representing the minimum readable character size P and the horizontal axis representing the viewing distance D. Hereinafter, an example in which the minimum readable character size P at the viewing distance D is calculated using Expression (1) will be described. Expression (1) is stored in the character size information storage area 306. Of course, a relational expression indicating the relation between the minimum readable character size P and the viewing distance D other than the expression (1) may be used. A table indicating the relationship between the minimum readable character size P and the viewing distance D may be stored in the character size information storage area 306. That is, character size information indicating the relationship between the viewing distance D and the minimum readable character size P for the target person determined according to the viewing distance D is stored in the character size information storage area 306.

  An example of a method for controlling the character size displayed on the display device 2 by the display control device shown in FIG. 1 will be described with reference to the flowcharts shown in FIGS. First, an example of a method for registering browsing-permitted users will be described with reference to the flowchart of FIG.

  In step S <b> 1, the user registration unit 10 registers registration information such as information related to each user's face image in the display control device using the imaging unit 31, for example. As already described, the user registration unit 10 stores the user ID of the user corresponding to the face image in the registration information storage area 301 in association with the face image. The user ID is stored, for example, in the registration information storage area 301 via the input device 4.

  In step S <b> 2, for each file whose contents are displayed on the display device 2, the browsing permission registration unit 20 registers the user ID of the browsing permitted user of the file as browsing permission information. Specifically, the browsing permission registration unit 20 creates a browsing permission list in which the user ID of the browsing permitted user is registered for each file. The created browsing permission list is stored in the permission information storage area 302. The browsing permission list may be stored in advance in the permission information storage area 302 via the input device 4.

  Next, an example of a method for controlling the character size displayed on the display device 2 will be described with reference to the flowchart shown in FIG.

  In step S <b> 10, the person detection unit 32 analyzes the image information input from the imaging unit 31 and detects whether a person exists around the display device 2. If there is a person around the display device 2, the process proceeds to step S20. When there is no person around the display device 2, the person detection unit 32 processes image information input from the imaging unit 31 until a person is detected around the display device 2.

  In step S <b> 20, the identification unit 33 reads the face image of each user, which is registration information registered by the user registration unit 10, from the registration information storage area 301. The identification unit 33 compares the read face image of each user with the face image of the target person input from the imaging unit 31 to identify the target person. When the photographed person is identified and identified by the identifying unit 30, that is, when the person is authenticated, the identifying unit 30 acquires the user ID of the target person. If no person is identified, the user ID of the target person is not acquired.

  In step S <b> 30, the determination unit 40 determines whether the person identified by the identification unit 30 is a browsing-permitted user who is permitted to browse the contents of the file displayed on the display device 2. Specifically, the determination unit 40 acquires information on the file whose contents are displayed on the display device 2 from the display device 2 and reads the browsing permission list from the permission information storage area 302. The determination unit 40 compares the user ID acquired by the identification unit 30 with the browsing permission list, and whether or not the user ID of the target person is included in the browsing permitted user of the file whose contents are displayed on the screen 21. Determine. If the target person is a browsing-permitted user, the process of step S30 is repeated. On the other hand, if it is determined that the target person is not a browsing-permitted user, the process proceeds to step S40. If the target person input from the imaging unit 31 cannot be identified and the user ID of the target person is not acquired, the determination unit 40 determines that the target person is not a browsing-permitted user.

  In step S <b> 40, the distance calculation unit 51 calculates the distance between the target person and the center coordinates of the screen of the display device 2, that is, the viewing distance D. The calculated viewing distance D is stored in the calculation result storage area 305.

  In step S <b> 50, the size changing unit 52 reads the viewing distance D from the calculation result storage area 305 and acquires information on the character size displayed on the display device 2 from the display device 2. The size changing unit 52 determines whether the size of the character displayed on the display device 2 with respect to the viewing distance D is equal to or larger than the minimum readable size of the target person. Specifically, the size changing unit 52 reads the expression (1) as the character size information from the character size information storage area 306 and displays on the display device 2 a character having a size equal to or larger than the minimum readable character size P corresponding to the viewing distance D. It is determined with reference to the calculation result using the formula (1). When the character of the size more than the minimum readable character size P is displayed on the display apparatus 2, it progresses to step S60. On the other hand, when the character of the size more than the minimum readable character size P is not displayed on the display apparatus 2, a process returns to step S40.

  In step S <b> 60, the size changing unit 52 controls the display device 2 to change a character having a size greater than or equal to the minimum readable character size P to a size smaller than the minimum readable character size P. Then, the process returns to step S40, and continuously calculates the distance between the target person who is not a browsing-permitted user and the display device 2, and the minimum readable character size P corresponding to the calculated distance is minimum readable. The character is changed to a size smaller than the character size P.

In addition, the display controller may have the following functions as additional functions:
(A) As a result of step S <b> 20, when the user who is permitted to view the file displayed on the display device 2 is not detected around the display device 2, the entire contents of the file are not displayed on the display device 2.

(B) As a result of step S <b> 20, when only a user who is permitted to view the file displayed on the display device 2 is around the display device 2, the entire contents of the file are displayed on the display device 2.

Specifically, the control unit 50 controls the display device 2 to display or hide the file contents on the display device 2.

  In step S60, an example in which a character having a size greater than or equal to the minimum readable character size P is changed to a character having a size smaller than the minimum readable character size P has been shown. May be smaller than the minimum readable character size P. As a result, the size relationship between the character sizes in the file can be maintained. Since a character having a size of at least the minimum readable character size P is changed to a character having a size smaller than the minimum readable character size P, a target person who is not a browsing-permitted user cannot browse the contents of the file.

  In step S40, when the user ID of the target person has not been acquired, an example in which the target person is determined not to be a viewing-permitted user has been shown. However, when the user ID of the target person has not been acquired, the target person is It is also possible to set to determine that the user is a browsing-permitted user. That is, it is possible to prohibit browsing of the contents of the file displayed on the display device 2 only for a specific person.

  If a plurality of persons are included in the image information, it is determined whether or not all the users are browsing-permitted users. When one person who is not a browsing-permitted user is included, the screen display control described above is performed.

  In the above description, an example in which the minimum readable character size P is set using the viewing distance D has been shown. However, in addition to the viewing distance D, for example, the brightness of the room where the display device 2 is installed is displayed on the display device 2. The minimum readable character size P may be set using the type of characters (Mincho, Gothic, Kanji, Hiragana, etc.), the visual acuity of the target person, the age of the target person, and the like.

  The series of display control operations shown in FIG. 5 can be executed by controlling the display control apparatus shown in FIG. 1 by a program having an algorithm equivalent to that shown in FIG. This program may be stored in the storage device 3 constituting the display control device shown in FIG. The program is stored in a computer-readable recording medium, and the recording medium is read into the storage device 3 via the output device 5 shown in FIG. 1, thereby executing a series of display control operations of the present invention. can do. Here, the “computer-readable recording medium” means a medium that can record electronic data, such as an external memory device of a computer, a semiconductor memory, a magnetic disk, and an optical disk. Specifically, a “flexible disk, CD-ROM, MO disk, etc.” are included in the “computer-readable recording medium”.

  As described above, according to the display control apparatus according to the first embodiment of the present invention, it is identified whether or not the target person around the display apparatus 2 is a browsing-permitted user, and the target person can browse. When the user is not an authorized user, the size of the character displayed on the display device 2 is automatically changed to a size smaller than the minimum readable character size P. Therefore, it is not necessary for the user to manually view the contents of the file displayed on the display device 2, and convenience is improved.

  Further, according to the display control device screen according to the first embodiment of the present invention, the user who is browsing the contents of the displayed file does not notice that another user is browsing the screen from behind. The size of the characters displayed on the display device 2 is automatically changed even when leaving the seat while displaying the contents of the file. Therefore, security can be ensured. Furthermore, when controlling the size of only the characters that violate security, the user's work efficiency is reduced compared to the case where the display and non-display of the entire file contents are controlled according to the presence of a person who is not permitted to view. Can be reduced. That is, by changing the size of the character to a size that cannot be recognized by the person behind, the user can continue working while ensuring security.

(Second Embodiment)
As shown in FIG. 6, in the display control apparatus according to the second embodiment of the present invention, the control unit 50 detects whether or not the direction of the person's line of sight is facing the display device 2. 1 is different from FIG. Other configurations are the same as those of the first embodiment shown in FIG. The line-of-sight detection unit 53 processes the face image of the target person included in the image information captured by the imaging unit 31, and detects the line-of-sight direction and eyeball position of the target person. It should be noted that a known method can be applied to the method of detecting the eye direction and the eyeball position of the target person.

  In the display control apparatus shown in FIG. 1, every time a person other than the viewing-permitted user passes around the display apparatus 2, even if the person is indifferent to the contents of the file displayed on the display apparatus 2, the display apparatus There is a possibility that the size of the character displayed in 2 is changed.

  In order to solve the above problem, the display control apparatus shown in FIG. 6 detects the direction of the line of sight of the target person. And when the character more than the minimum readable character size P is displayed on the display apparatus 2, the size of the character displayed on the display apparatus 2 is changed according to the motion of the line of sight of the target person who is not a browsing permission user. . Specifically, when the line of sight of the target person is directed to the display device 2, the size of the character displayed on the display device 2 is made smaller than the minimum readable character size. When the line of sight of the target person is not directed to the display device 2, the size of the characters displayed on the display device 2 is not changed.

  An example of a method for controlling the character size displayed on the display device 2 by the display control device shown in FIG. 6 will be described with reference to the flowchart shown in FIG.

  In Steps S10 to S50 of FIG. 7, when the target person around the display device 2 is not a browsing-permitted user, as in the method described with reference to the flowchart of FIG. It is determined whether or not the size is equal to or larger than the minimum readable size of the target person. When the character of the size more than the minimum readable character size P is displayed on the display apparatus 2, it progresses to step S52.

  In step S52, the line-of-sight detection unit 53 detects the line of sight and eyeball position of the target person. Information on the detected line of sight and eyeball position of the target person is stored in the line-of-sight information storage area 307 included in the storage device 3. In step S54, the line-of-sight detection unit 53 reads information on the line of sight and eyeball position of the target person from the line-of-sight information storage area 307, and whether or not the line of sight of the target person is directed to the display device 2, that is, the target person is the display device. Determine whether you are watching 2. When it is determined that the line of sight of the target person is directed to the display device 2, the process proceeds to step S60, and a character having a size greater than or equal to the minimum readable character size P is changed to a character having a size smaller than the minimum readable character size P. The On the other hand, when it is determined that the line of sight of the target person is not directed to the display device 2, the size of the character displayed on the display device 2 is not changed.

  In the above, an example in which the direction of the line of sight of the target person is used has been described, but it may be determined whether the line of sight of the target person is directed toward the display device 2 using the direction of the face of the target person.

  In the display control apparatus according to the second embodiment of the present invention, in addition to the distance between the target person and the display apparatus 2, it is determined whether or not the line of sight of the target person is directed to the display apparatus 2. Therefore, it is possible to avoid changing the size of the character displayed on the display device 2 every time a person other than the browsing-permitted user passes around the display device 2. As a result, according to the display control apparatus shown in FIG. 6, it is possible to further reduce the reduction in work efficiency of the browsing-permitted user. Others are substantially the same as those in the first embodiment, and redundant description is omitted.

(Other embodiments)
As described above, the present invention has been described according to the first and second embodiments. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  In the description of the first and second embodiments already described, examples using personal authentication technology based on face recognition have been described. For example, fingerprints, irises, veins, high-frequency identification (RFID) tags, etc. Personal authentication technology using can be applied.

  As described above, the present invention naturally includes various embodiments not described herein. Accordingly, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

It is a schematic diagram which shows the structure of the display control apparatus which concerns on the 1st Embodiment of this invention. It is a schematic diagram which shows the structural example of the imaging part and display apparatus of the display control apparatus which concern on the 1st Embodiment of this invention. It is a graph which shows the example of the relationship between minimum readable character size and viewing distance. It is a flowchart for demonstrating the example of the method of registering the browsing permission user which concerns on the 1st Embodiment of this invention. It is a flowchart for demonstrating the example of the display control method which concerns on the 1st Embodiment of this invention. It is a schematic diagram which shows the structure of the display control apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart for demonstrating the example of the display control method which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Processing apparatus 2 ... Display apparatus 3 ... Storage apparatus 4 ... Input apparatus 5 ... Output apparatus 10 ... User registration part 20 ... Browse permission registration part 30 ... Identification part 31 ... Imaging part 32 ... Person detection part 33 ... Identification part 40 ... Determination unit 50 ... control unit 51 ... distance calculation unit 52 ... size change unit 53 ... gaze detection unit 301 ... registration information storage area 302 ... permission information storage area 303 ... identification result storage area 304 ... determination result storage area 305 ... calculation result storage Area 306 ... Character size information storage area 307 ... Line of sight information storage area

Claims (10)

A display control device for controlling a display device,
Identification means for identifying a person and storing the identification result in the identification result storage means;
Reading permission information and the identification result that specify a browsing-permitted user who is permitted to view the contents of the file displayed on the display device are read from the permission information storage means and the identification result storage means, respectively, and the browsing permission A determination unit that compares information and the identification result to determine whether the person is the browsing-permitted user and stores the determination result in a determination result storage unit;
Calculating a distance between the position of the person and the display device, and storing a calculation result in a calculation result storage unit;
The determination result, the calculation result, and character size information indicating the relationship between the distance and the minimum readable character size are read from the determination result storage unit, the calculation result storage unit, and the character size information storage unit, respectively. A display control device comprising: a size changing unit that refers to the character size information and changes the size of the character displayed on the display device according to the distance when the user is not a browsing-permitted user.   When the person is not a browsing-permitted user, the size changing unit detects a character larger than the minimum readable character size from the character displayed on the display device, and at least the size of the detected character is the minimum readable character. The display control apparatus according to claim 1, wherein the display control apparatus is changed to a size smaller than the size.   When the person is not a viewing-permitted user, the size changing unit detects characters larger than the minimum readable character size from characters displayed on the display device, and the size of only the detected character is the minimum readable character size. The display control apparatus according to claim 1, wherein the display control apparatus is changed to a smaller size.   4. The apparatus according to claim 1, further comprising control means for controlling the display device so that the entire contents of the file are not displayed when all the persons identified by the identification means are not the browsing-permitted users. The display control apparatus according to any one of the above.   5. The display control apparatus according to claim 4, wherein when all the persons identified by the identification means are the browsing-permitted users, the control means displays the entire contents of the file on the display device. .   The display device further includes a line-of-sight detection unit that detects whether or not the line of sight of the person is facing the display device, and the size changing unit is connected to the display device according to a distance between the display device and the person and a direction of the line of sight. The display control apparatus according to claim 1, wherein a size of a displayed character is changed. The identification means is
Imaging means for obtaining image information;
A person detecting means for analyzing the image information and detecting whether or not person information is included in the image information;
The display control apparatus according to claim 1, further comprising: an identification unit that identifies the detected person with reference to registration information registered in advance. A display device using a display control device including an identification unit, a determination unit, a distance calculation unit, a size change unit, an identification result storage unit, a permission information storage unit, a determination result storage unit, a calculation result storage unit, and a character size information storage unit A display control method for controlling,
The identification means identifying a person and storing the identification result in the identification result storage means;
The determination means obtains the browsing permission information and the identification result defining the browsing-permitted user who is permitted to browse the contents of the file displayed on the display device from the permission information storage means and the identification result storage means. Respectively, reading, comparing the browsing permission information and the identification result to determine whether the person is the browsing permitted user, and storing the determination result in the determination result storage means;
The distance calculating means calculates a distance between the position of the person and the display device, and stores a calculation result in the calculation result storage means;
The size changing means includes the determination result, the calculation result, and character size information indicating a relationship between the distance and the minimum readable character size, the determination result storage means, the calculation result storage means, and the character size information storage means. And when the person is not a browsing-permitted user, the character size information is referred to and the size of the character displayed on the display device is changed according to the distance. Control method. A display control program for controlling a display device,
An instruction for causing the identification means to identify the person and storing the identification result in the identification result storage means;
The judging means reads the browsing permission information defining the browsing-permitted users who are permitted to browse the contents of the file displayed on the display device and the identification result from the permission information storage means and the identification result storage means, respectively. A command for comparing the browsing permission information with the identification result to determine whether the person is the browsing-permitted user and storing the determination result in a determination result storage unit;
A command for causing the distance calculation means to calculate a distance between the position of the person and the display device, and to store the calculation result in the calculation result storage means;
Character size information indicating the relationship between the determination result, the calculation result, and the distance and the minimum readable character size is sent to the size changing unit from the determination result storage unit, the calculation result storage unit, and the character size information storage unit, respectively. A display control program for reading and executing a command to refer to the character size information and change the size of the character displayed on the display device according to the distance when the person is not a viewing-permitted user . An instruction for causing the identification means to identify the person and storing the identification result in the identification result storage means;
The judging means reads the browsing permission information defining the browsing-permitted users who are permitted to browse the contents of the file displayed on the display device and the identification result from the permission information storage means and the identification result storage means, respectively. A command for comparing the browsing permission information with the identification result to determine whether the person is the browsing-permitted user and storing the determination result in a determination result storage unit;
A command for causing the distance calculation means to calculate a distance between the position of the person and the display device, and to store the calculation result in the calculation result storage means;
Character size information indicating the relationship between the determination result, the calculation result, and the distance and the minimum readable character size is sent to the size changing unit from the determination result storage unit, the calculation result storage unit, and the character size information storage unit, respectively. A display control program for reading and executing a command to refer to the character size information and change the size of the character displayed on the display device according to the distance when the person is not a viewing-permitted user Display control program recording medium for storing

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