JP2020052191A - Display control device and display control method - Google Patents

Abstract

To allow a user to easily change a display area of an image.SOLUTION: A display control device 10 comprises: a calculation unit 124 that calculates a distances defined with respect to a display surface of a display 2 in the horizontal axis direction, the distance between a reference point predetermined on the face of a user and a reference position predetermined with respect to the reference point, and a distance defined with respect to the display surface in the vertical axis direction; and a display control unit 125 that specifies a scroll speed in the horizontal axis direction that is a moving speed in the horizontal axis direction of a display area in a display image displayed on the display 2 on the basis of the calculated distance in the horizontal axis direction, specifies a scroll speed in the vertical axis direction that is a moving speed in the vertical axis direction of the display area on the basis of the calculated distance in the vertical axis direction, independently changes the position in the horizontal axis direction and the position in the vertical axis direction of the display area on the basis of the specified scroll speed in the horizontal axis direction and the scroll speed in the vertical axis direction, and displays a partial image, in the display image, which is included in the display area on the display 2.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a display control device and a display control method.

  2. Description of the Related Art Conventionally, an image is displayed on a display unit having a limited screen size, such as a display unit mounted on a vehicle or a display unit of a mobile terminal (for example, see Patent Document 1).

JP-A-11-42971

  When displaying a large-sized image on a display unit whose screen size is restricted, only a part of the image may be displayed. In order for the user to check the entire image, it is necessary to reduce the display or scroll the image by operating the operation unit, and the operation is complicated.

  Therefore, the present invention has been made in view of these points, and an object of the present invention is to provide a display control device and a display control method that allow a user to easily change a display area of an image.

  A display control device according to a first aspect of the present invention, an acquisition unit configured to acquire an image of a user captured by an imaging unit provided at a position fixed with respect to a position of a display unit that displays an image; In the image obtained by the obtaining unit, a position specifying unit that specifies a position of a predetermined reference point on the user's face, and a position of the reference point specified by the position specifying unit; A distance from a predetermined reference position, and a distance in the horizontal axis direction defined with respect to the display surface of the display unit and a distance in the vertical axis direction defined with respect to the display surface are calculated. And calculating the scrolling speed in the horizontal axis direction, which is the moving speed in the horizontal axis direction of the display area in the display image displayed on the display unit based on the distance in the horizontal axis direction calculated by the calculating unit. And the length calculated by the calculation unit The scroll speed in the vertical axis direction, which is the moving speed in the vertical axis direction of the display area based on the distance in the direction, is specified, and based on the specified scroll speed in the horizontal axis direction and the scroll speed in the vertical axis direction. A display control unit that independently changes a position in the horizontal axis direction and a position in the vertical axis direction of the display area and displays a partial image included in the display area on the display unit among the display images. .

  The display control unit, when the distance in the horizontal axis direction calculated by the calculation unit is shorter than a first distance, does not change the position of the display area in the horizontal axis direction, the calculation unit calculated When the distance in the vertical axis direction is shorter than the second distance, control may be performed so that the position of the display area in the vertical axis direction is not changed.

  The display control unit, when the distance in the horizontal axis direction calculated by the calculation unit is longer than a third distance, specifies the scroll speed in the horizontal axis direction of the display area as a first scroll speed, and When the distance in the vertical axis direction calculated by the unit is longer than a fourth distance, the scroll speed of the display area in the vertical axis direction may be specified as a second scroll speed.

The display control unit, when the distance in the horizontal axis direction calculated by the calculation unit is equal to or less than the third distance, based on the distance in the horizontal axis direction calculated by the calculation unit, Identifying an axial scroll speed, and when the distance in the vertical axis direction calculated by the calculation unit is equal to or less than the fourth distance, the display area is determined based on the distance in the vertical axis direction calculated by the calculation unit. The scroll speed in the vertical axis direction may be specified.
The display control unit may move the display area in a direction opposite to a direction of the reference point with respect to the reference position.

  A display control method according to a second aspect of the present invention acquires a user image captured by an imaging unit provided at a position fixed to a position of a display unit that displays an image, which is executed by a computer. A step of specifying a position of a predetermined reference point on the user's face in the acquired image; a position of the specified reference point; and a position predetermined for the reference point. Calculating a distance from a reference position, a distance in a horizontal direction defined with respect to a display surface of the display unit, and a distance in a vertical direction defined with respect to the display surface; The scrolling speed in the horizontal axis direction, which is the moving speed in the horizontal axis direction of the display area in the display image displayed on the display unit based on the distance in the horizontal axis direction, is specified, and the calculated vertical axis direction is calculated. Based on the distance of The scroll speed in the vertical axis direction, which is the moving speed in the vertical axis direction of the display area in the display image displayed on the display unit, is specified, and the specified scroll speed in the horizontal axis direction and the scroll speed in the vertical axis direction are specified. And independently changing the position of the display area in the horizontal axis direction and the position of the vertical axis direction of the display area, and displaying a partial image included in the display area in the display image on the display unit. Prepare.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that a user can change the display area of an image easily.

It is a figure for explaining composition of a vehicle in which a display control device concerning a 1st embodiment is carried. It is a figure for explaining an outline of a display control device concerning a 1st embodiment. It is a figure showing the composition of the display control device concerning a 1st embodiment. FIG. 4 is a diagram illustrating a relationship between a moving distance in a horizontal axis direction and a scroll speed in a horizontal axis direction according to the first embodiment. It is a figure explaining the calculation method of an upper limit distance. FIG. 9 is a diagram illustrating an example of a relationship between a distance between a center of a display image and a center of a display area in a horizontal axis direction and a coefficient in a horizontal axis direction. 5 is a flowchart illustrating a flow of a process executed by the display control device according to the first embodiment. FIG. 2 is a diagram illustrating a configuration of a mobile terminal functioning as a display control device. It is a figure showing the range of the movement distance which does not change the position of the display field concerning a 2nd embodiment. FIG. 9 is a diagram illustrating a relationship between a moving distance and a scroll speed according to the second embodiment. FIG. 14 is a diagram illustrating a relationship between a moving distance and a predetermined scroll speed according to a third embodiment. FIG. 14 is a diagram illustrating a relationship between a moving distance and an upper limit speed according to a fourth embodiment. It is a figure showing the example where the speed range identification information concerning a 4th embodiment was displayed on a display. It is a figure showing the relation between the relative position and scroll speed concerning a 5th embodiment.

<Overview of First Embodiment>
FIG. 1 is a diagram for explaining a configuration of a vehicle V on which the display control device 10 according to the first embodiment is mounted. The display control device 10 according to the first embodiment is mounted on a vehicle V and is used for controlling display on a display device 2 provided in the vehicle V. The display control device 10 according to the first embodiment is used for, for example, a vehicle V such as a bus or a truck.

  FIG. 2 is a diagram for describing an overview of the display control device 10 according to the first embodiment. In the first embodiment, when the operation button 3 provided near the display device 2 is operated, the display control device 10 analyzes the image of the driver (user) of the vehicle V captured by the imaging device 1. As shown in FIG. 2, the position of a predetermined reference point on the driver's face F shown in the image is defined as a reference position PB. After that, the display control device 10 analyzes the image of the driver of the vehicle V captured by the imaging device 1 and specifies the position PF of a predetermined reference point on the driver's face F indicated in the image.

  The display control device 10 calculates a distance D between the specified reference position PB and the position PF of the reference point, and scrolls the moving speed in the vertical axis direction or the horizontal axis direction of the display area determined based on the distance D. The position of the display area A in the display image i displayed on the display device 2 is changed based on the speed, and the partial image included in the display area A in the display image i is displayed on the display device 2. By doing so, the driver can easily change the display area of the display image i by changing the position of his / her face with respect to the display device 2.

<Configuration of display control device 10>
Next, the configuration of the display control device 10 will be described. FIG. 3 is a diagram illustrating a configuration of the display control device 10 according to the first embodiment. The display control device 10 is a computer, and is connected to the imaging device 1, the display device 2, and the operation buttons 3 provided in the vehicle V, as shown in FIG.

  The imaging device 1 is a vehicle-mounted camera mounted on the vehicle V. The imaging device 1 is provided at a position fixed with respect to the position of the display device 2. The imaging device 1 is provided, for example, near the display device 2. The imaging device 1 functions as an imaging unit and images the driver's face of the vehicle V by imaging the driver's seat of the vehicle V.

The display device 2 is a liquid crystal display or an organic EL (Electro-Luminescence) display mounted on the vehicle V, and functions as a display unit. The display device 2 displays various information and images under the control of the display control unit 125.
The operation button 3 is provided, for example, in the vicinity of the display device 2 and receives an operation related to a display control start instruction and an operation related to an end instruction for changing a display area of an image displayed on the display device 2.

The display control device 10 includes a storage unit 11 and a control unit 12.
The storage unit 11 is, for example, a ROM (Read Only Memory), a RAM (Random Access Memory), or a hard disk. The storage unit 11 stores various programs for causing the control unit 12 to function. The storage unit 11 stores a program that causes the control unit 12 to function as the operation reception unit 121, the acquisition unit 122, the position identification unit 123, the calculation unit 124, and the display control unit 125.

  The control unit 12 is, for example, an electronic control unit (ECU). The control unit 12 functions as an operation reception unit 121, an acquisition unit 122, a position identification unit 123, a calculation unit 124, and a display control unit 125 by executing a program stored in the storage unit 11.

  The operation receiving unit 121 performs an operation (start operation) related to a display control start instruction for changing a position of a display area of a display image displayed on the display device 2 from a driver of the vehicle V via the operation button 3. Accept. Further, when the display control for changing the position of the display area of the display image displayed on the display device 2 is being performed, the operation reception unit 121 receives a command from the driver of the vehicle V via the operation button 3. An operation (end operation) related to a display control end instruction is accepted.

  The acquisition unit 122 acquires an image of the driver captured by the imaging device 1. For example, when the operation reception unit 121 receives a start operation, the acquisition unit 122 acquires an image of the driver captured by the imaging device 1 at predetermined time intervals (for example, every 100 milliseconds). When the operation reception unit 121 receives the end operation, the acquisition unit 122 causes the imaging device 1 to end imaging and stop acquiring the driver's image.

  The position specifying unit 123 specifies the position of a reference point predetermined on the driver's face in the image obtained by the obtaining unit 122 when the operation receiving unit 121 receives the start operation. Specifically, the position specifying unit 123 analyzes the image acquired by the acquiring unit 122, and identifies the position of each of the driver's eyes in the image. The position specifying unit 123 specifies the position of the intermediate point of both eyes as the position of the reference point.

  Here, it is assumed that the acquisition unit 122 has a reference point on a reference plane parallel to the display surface of the display device 2 and specifies the position of the reference point by calculating the position coordinates of the reference point on the reference plane. It shall be. The acquisition unit 122 determines, as position coordinates of the reference point, coordinates corresponding to a horizontal axis direction (left-right direction) defined with respect to the display surface of the display device 2 and a vertical axis direction defined with respect to the display surface ( (Vertical direction). The position specifying unit 123 sets the position of the reference point specified based on the image acquired by the acquiring unit 122 when the operation receiving unit 121 receives the start operation, as the reference position of the driver's face.

  In addition, the position specifying unit 123 specifies the position of a reference point predetermined on the driver's face in the image obtained by the obtaining unit 122 after the operation receiving unit 121 receives the start operation.

  The position specifying unit 123 may analyze the image obtained by the obtaining unit 122 and specify the outline of the driver's face. Then, the position specifying unit 123 may specify the center position of the driver's face as the position of the reference point based on the contour of the driver's face. Further, when the midpoint between the eyes cannot be specified due to the driver wearing sunglasses or the like, the position specifying unit 123 may specify the position of the reference point based on the contour of the driver's face.

  The calculating unit 124 calculates a moving distance that is a distance between the position of the reference point specified by the position specifying unit 123 and a predetermined reference position with respect to the reference point. Specifically, the calculation unit 124 calculates the horizontal movement distance defined with respect to the display surface of the display device 2 between the position of the reference point specified by the position specification unit 123 and the reference position. Then, the moving distance in the vertical axis direction defined with respect to the display surface of the display device 2 between the position of the reference point and the reference position is calculated. The calculation unit 124 calculates the moving distance in the horizontal axis direction and the moving distance in the vertical axis direction by subtracting the position coordinates indicating the position of the reference point from the position coordinates corresponding to the reference position.

  When a partial image that is a part of the display image is displayed on the display device 2, the display control unit 125 controls the calculation unit 124 from when the operation reception unit 121 receives the start operation to when the operation reception unit 121 receives the end operation. The scroll speed of the display area in the display image displayed on the display device 2 is specified based on the calculated moving distance. Then, the display control unit 125 changes the position of the display area based on the specified scroll speed, and causes the display device 2 to display a partial image included in the display area among the display images. Here, the display image is, for example, an image indicated by the image file or a map image generated by a navigation device for navigating a driver to a route to a destination, and is smaller than the size of the display surface of the display device 2. It is assumed that the size is large.

  The display control unit 125 specifies the scroll speed from when the operation receiving unit 121 receives the start operation to when it receives the end operation, but is not limited to this. The display control unit 125 may cause the acquisition unit 122 to acquire an image of the driver who is driving, and may detect that the driver is winking based on the image. Then, the display control unit 125 may specify the scroll speed from when the driver winks to when the driver wins next, or while the driver winks.

  The display control unit 125 specifies a relatively high scroll speed as the movement distance calculated by the calculation unit 124 increases. Hereinafter, details of the process of specifying the scroll speed by the display control unit 125 will be described.

  First, the storage unit 11 stores distance-based speed information in which distance information indicating a moving distance is associated with speed information indicating a scroll speed. Specifically, the storage unit 11 stores distance-specific speed information in which horizontal distance information indicating a horizontal moving distance and horizontal speed information indicating a horizontal scroll speed are associated. .

  FIG. 4 is a diagram illustrating the relationship between the moving distance in the horizontal axis direction and the scroll speed in the horizontal axis direction according to the first embodiment. The horizontal axis in FIG. 4 indicates the moving distance in the horizontal axis direction defined on the display surface of the display device 2. 4, the positive direction of the horizontal axis corresponds to the right side of the display surface of the display device 2, and the negative direction corresponds to the left side of the display surface of the display device 2. The vertical axis in FIG. 4 indicates the height of the scroll speed in the horizontal axis direction defined on the display surface of the display device 2. The positive direction of the vertical axis in FIG. 4 corresponds to the right side of the display surface of the display device 2, and the negative direction corresponds to the left side of the display surface of the display device 2.

  As shown in FIG. 4, the moving speed to the left of the display area increases as the moving distance increases to the right, and the moving speed to the right of the display area increases as the moving distance increases to the left. Can be confirmed to be higher. The display area moves in the direction opposite to the direction of the reference point with respect to the reference position. In the present embodiment, the display area moves in the direction opposite to the direction of the reference point with respect to the reference position, but is not limited to this. The display area may move in the same direction as the direction of the reference point with respect to the reference position. By doing so, the display control device 10 can move the display area in the same direction as the moving direction of the driver's face.

  The display control unit 125 specifies the scroll speed corresponding to the movement distance calculated by the calculation unit 124 with reference to the distance-specific speed information stored in the storage unit 11. The display control unit 125 specifies the horizontal scrolling speed corresponding to the horizontal moving distance calculated by the calculating unit 124 with reference to the horizontal distance-specific speed information stored in the storage unit 11. Similarly, the display control unit 125 specifies the vertical scrolling speed corresponding to the vertical moving distance calculated by the calculating unit 124 with reference to the vertical distance-specific speed information stored in the storage unit 11. I do.

  When displaying the partial image, the display control unit 125 changes the position of the display area in the horizontal axis direction based on the specified horizontal scroll speed, and based on the specified vertical axis scroll speed, The position of the display area in the direction of the vertical axis is changed. Then, the display control unit 125 causes the display device 2 to display the partial image included in the display area.

  Here, as shown in FIG. 4, as the moving distance increases to the right, the moving speed to the left of the display area increases, and as the moving distance increases to the left, the moving speed increases to the right of the display area. The display control unit 125 moves the display area in a direction opposite to the direction of the reference point with respect to the reference position. By doing so, the display control device 10 can move the display area in response to the operation of the driver looking into the display image located behind the display surface of the display device 2.

  The display control unit 125 specifies a distance between the center of the display image and the center of the display area, and the distance is within a predetermined range from an upper limit distance determined based on the size of the display image and the size of the display area. In this case, the scroll speed may be corrected so that the scroll speed becomes relatively small. FIG. 5 is a diagram illustrating a method of calculating the upper limit distance. FIG. 5 shows a state in which the upper right vertex of the display area A is in contact with the upper right vertex of the display image i, and the display area A cannot move upward and right. At this time, the distance Dmx in the horizontal axis direction and the distance Dmy in the vertical axis direction of the center Oa of the display area A with respect to the center Op of the display image i are the upper limit distance. Assuming that the width of the display image i is Xi, the height is Yi, the width of the display area is Xa, and the height is Ya, the upper limit distance Dmx in the horizontal axis direction is (Xi-Xa) / 2, and the upper limit in the vertical axis direction. The distance Dmy is (Yi-Ya) / 2.

  The storage unit 11 stores a distance between the center of the display image and the center of the display area and a coefficient for changing a scroll speed, and when the distance is within a predetermined range from the upper limit distance, the storage unit 11 is outside the predetermined range. Is stored in association with a coefficient whose value is smaller than that of. Here, the coefficients are provided independently in the horizontal axis direction and the vertical axis direction. FIG. 6 is a diagram illustrating an example of the relationship between the distance between the center of the display image and the center of the display area in the horizontal axis direction and the coefficient in the horizontal axis direction. Note that, also in the vertical axis direction, it is assumed that the distance between the center of the display image in the vertical axis direction and the center of the display area and the coefficient in the vertical axis direction are stored in the storage unit 11 in association with each other. As shown in FIG. 6, when the distance in the horizontal axis direction between the center of the display image and the center of the display area is equal to or more than a predetermined ratio (for example, 90%) of the upper limit distance Dmx, the display image in the horizontal axis direction is displayed. It can be confirmed that the coefficient decreases until the distance between the center of the display area and the center of the display area becomes the upper limit distance Dmx.

  The display control unit 125 specifies the scroll speed corresponding to the movement distance calculated by the calculation unit 124 with reference to the speed-specific distance information stored in the storage unit 11 and the distance from the center of the display image in the display area. Is specified, and the scroll speed is corrected by multiplying the scroll speed by the coefficient. Then, the display control unit 125 changes the position of the display area based on the corrected scroll speed. By doing so, the display control device 10 can smoothly reduce the scroll speed as the distance between the center of the display image and the center of the display area approaches the upper limit distance.

  In addition, the display control unit 125 controls the position of the display area so that the display area of the display image does not exceed the contour of the display image. For example, when the distance between the center of the display image and the center of the display area is the upper limit distance, and the scroll direction corresponding to the scroll speed is the direction in which the distance increases, Control so that the position does not change. By doing so, it is possible to suppress the display area from exceeding the contour of the display image and preventing the display device 2 from displaying a partial image of the display image.

<Processing flow of image display executed by display control device 10>
FIG. 7 is a flowchart for explaining the flow of processing executed by the display control device 10 according to the first embodiment. Note that, in this flowchart, an example in which the display area is changed based on the distance between the reference position and the position of the reference point between the time when the operation button provided on the vehicle V is pressed and the time when the operation button is pressed next time is described. explain. At the start of this flowchart, for example, it is assumed that a partial image included in the display area of the display image is being displayed.

  First, the display control unit 125 determines whether the operation button has been pressed (S1). When determining that the operation button is pressed, the display control unit 125 shifts the processing to S2, and when it is determined that the operation button is not pressed, re-executes S1.

Subsequently, the acquisition unit 122 acquires an image captured by the imaging device 1 (S2).
Subsequently, the position specifying unit 123 specifies the position of a reference point predetermined on the driver's face based on the image acquired in S2, and specifies the position as the reference position of the driver's face ( S3).

Subsequently, the acquisition unit 122 acquires an image captured by the imaging device 1 (S4).
Subsequently, the position specifying unit 123 specifies the position of a reference point predetermined on the driver's face based on the image acquired in S4 (S5).
Subsequently, the calculation unit 124 specifies a movement distance that is a distance between the reference position specified in S3 and the position of the reference point specified in S5 (S6).

Subsequently, the display control unit 125 specifies the current position of the display area by specifying the distance between the center of the display image and the center of the display area (S7).
Subsequently, the display control unit 125 specifies the scroll speed of the display area based on the scroll speed associated with the movement distance specified in S6 and the coefficient associated with the position of the display area specified in S7. (S8).

  Subsequently, the display control unit 125 moves the position of the display area based on the scroll speed specified in S8 (S9). Note that the display control unit 125 performs control so as not to move the display area when the position of the display area is moved and the display area protrudes from the display image.

Subsequently, the display control unit 125 displays a partial image of the display image included in the display area (S10).
Subsequently, the display control unit 125 determines whether the operation button has been pressed (S11). If the display control unit 125 determines that the operation button has been pressed, it ends the process according to this flowchart, and if it determines that the operation button has not been pressed, moves the process to S4.

<Effects according to the first embodiment>
As described above, the display control device 10 according to the first embodiment specifies a reference position with respect to a reference point predetermined on the driver's face in an image captured by the imaging device 1, and determines the reference position. And the movement distance of the position of the reference point is calculated. Then, the display control device 10 changes the position of the display area in the display image displayed on the display device 2 based on the calculated moving distance, and displays the partial image included in the display region in the display image on the display device 2. Let it. By doing so, the driver can easily change the display area of the display image by changing the position of his / her face with respect to the display device 2.

  Further, the display control device 10 changes the position of the display area based on the scroll speed of the display area determined based on the calculated moving distance, and causes the display device 2 to display the partial image included in the display area. In this case, the display control device 10 specifies a higher scroll speed as the calculated moving distance becomes longer. By doing so, the display control device 10 can scroll the display area at high speed when the moving distance is long. Thereby, even when the size of the display image is significantly larger than the size of the display device 2 as in the case of map data, the display control device 10 moves the display region at a high speed to change the display region desired by the driver. It can be displayed promptly.

  In the present embodiment, an example has been described in which the display control device 10 is provided in the vehicle V, but the present invention is not limited to this. The display control device 10 may be, for example, a mobile terminal. FIG. 8 is a diagram showing a configuration of the mobile terminal 20 functioning as the display control device 10.

As illustrated in FIG. 8, the mobile terminal 20 includes an imaging unit 21, an input unit 22, a display unit 23, a storage unit 24, and a control unit 25.
The imaging unit 21 has the same function as the imaging device 1. The imaging unit 21 is provided at a position fixed with respect to the position of the display unit 23.
The display unit 23 includes, for example, a liquid crystal display, an organic EL display, or the like.

  The control unit 25 functions as an operation reception unit 251, an acquisition unit 252, a position identification unit 253, a calculation unit 254, and a display control unit 255. The operation reception unit 251, the acquisition unit 252, the position identification unit 253, the calculation unit 254, and the display control unit 255 are the same as the operation reception unit 121, the acquisition unit 122, the position identification unit 123, the calculation unit 124, and the display control unit 125, respectively. Has a function.

  The position specifying unit 253 of the mobile terminal 20 specifies the position of a reference point predetermined on the face of the user of the mobile terminal 20 in the image captured by the imaging unit 21, similarly to the display control device 10. The calculation unit 254 calculates a movement distance that is a distance between the position of the reference point and a reference position that is predetermined with respect to the reference point. The display control unit 255 specifies the scroll speed of the display area in the display image displayed on the display unit 23 based on the movement distance calculated by the calculation unit 254, and changes the position of the display area based on the specified scroll speed. The display unit 23 displays a partial image included in the display area in the display image. By doing so, the user of the mobile terminal 20 changes the position of his / her face with respect to the display unit 23, or changes the position where the imaging unit 21 takes an image by tilting the mobile terminal 20 with respect to his / her face. Thus, the partial image of the display image displayed on the display unit 23 can be easily changed.

<Second embodiment>
[Do not change the position of the display area when the moving distance from the reference position is short]
Subsequently, a second embodiment will be described. The display control device 10 according to the first embodiment causes the display device 2 to display based on a distance between a position of a predetermined reference point on the driver's face and a predetermined reference position with respect to the reference point. The position of the display area in the display image was changed, and the partial image included in the display area was displayed on the display device 2. However, it is rare that the position of the driver's face stops completely, and the driver's face often swings. Therefore, when the display area is accurately moved in response to the shaking of the driver's face, the display area continues to scroll in small increments, and there is a problem that visibility is deteriorated.

  Therefore, the display control device 10 according to the second embodiment performs control so that the position of the display area is not changed even if the position of the driver's face slightly changes from the reference position. Hereinafter, a display control device 10 according to the second embodiment will be described. The description of the same parts as those in the first embodiment will be omitted as appropriate.

  The display control unit 125 fixes the position of the display area in the display image displayed on the display device 2 when the movement distance calculated by the calculation unit 124 is equal to or less than the first predetermined distance, and the movement distance calculated by the calculation unit 124 is When the distance is longer than the first predetermined distance, the position of the display area is changed, and a partial image included in the display area among the display images is displayed on the display device 2.

  FIG. 9 is a diagram illustrating a range of a moving distance that does not change the position of the display area according to the second embodiment. FIG. 10 is a diagram illustrating a relationship between a moving distance and a scroll speed according to the second embodiment. FIG. 10A is a diagram illustrating a relationship between a moving distance in the horizontal axis direction and a scroll speed in the horizontal axis direction. FIG. 10B is a diagram illustrating a moving distance in the vertical axis direction and scrolling in the vertical axis direction. It is a figure showing the relation with speed. Note that the horizontal axis in FIG. 10B indicates the moving distance in the vertical axis direction defined on the display surface of the display device 2. The positive direction of the horizontal axis in FIG. 10B corresponds to the upper side of the display surface of the display device 2, and the negative direction corresponds to the lower side of the display surface of the display device 2. The vertical axis in FIG. 10B indicates the height of the scroll speed in the vertical axis direction defined on the display surface of the display device 2. The positive direction of the vertical axis in FIG. 10B corresponds to the upper side of the display surface of the display device 2, and the negative direction corresponds to the lower side of the display surface of the display device 2.

  When the movement distance in the horizontal axis direction calculated by the calculation unit 124 is equal to or less than the first distance Dx1 illustrated in FIGS. 9 and 10A, the display control unit 125 sets the display area in the display image displayed on the display device 2. Fix the position in the horizontal axis direction. When the movement distance in the horizontal axis direction calculated by the calculation unit 124 is longer than the first distance Dx1 shown in FIGS. 9 and 10A, the display control unit 125 changes the position of the display area in the horizontal axis direction. Let it.

  Similarly, when the movement distance in the vertical axis direction calculated by the calculation unit 124 is equal to or less than the second distance Dy2 shown in FIGS. The vertical position of the display area is fixed. When the moving distance in the vertical axis direction calculated by the calculating unit 124 is longer than the second distance Dy2 shown in FIGS. 9 and 10B, the display control unit 125 changes the position of the display area in the vertical axis direction. Let it.

  By doing so, the display control device 10 can change the position of the display area even if the position of the driver's face slightly moves from the reference position in the horizontal axis direction (horizontal direction) or the vertical axis direction (vertical direction). By fixing the display area, scrolling of the display area in small increments can be suppressed, and the visibility of the partial image can be improved.

  When the driver moves his / her face in the horizontal axis direction to move the display area in the horizontal axis direction, the display area scrolls in the horizontal axis direction by small movements in the vertical axis direction. Disappears. Similarly, when the driver moves his / her face in the vertical axis direction to move the display area in the vertical axis direction, the display area is scrolled in small increments in the horizontal axis direction due to slight movement in the horizontal axis direction. No longer. Therefore, the driver can easily scroll the display area straight in the horizontal axis direction or the vertical axis direction.

  Note that the display control unit 125 may set the first distance Dx1 to be longer than the second distance Dy2. For example, when the driver is sitting in the driver's seat, his / her face is more likely to move in the horizontal axis direction than in the case where the driver's face is moved in the vertical axis direction. Therefore, by making the first distance Dx1 longer than the second distance Dy2, it is possible to effectively prevent the display area from scrolling in small increments in the horizontal axis direction.

<Effects according to the second embodiment>
As described above, the display control device 10 according to the second embodiment determines that the movement distance between the reference point predetermined on the driver's face and the reference position determined with respect to the reference point is the first predetermined distance. When the distance is equal to or less than the distance, the position of the display area in the display image displayed on the display device 2 is fixed, and when the moving distance is longer than the first predetermined distance, the position of the display area is changed and included in the display area. The display device 2 displays the partial image. By doing so, the display control device 10 can suppress the display area from scrolling in small increments with respect to the shaking of the driver's face, and can improve the visibility.

<Third embodiment>
[Performs constant-speed scrolling when the moving distance increases]
Subsequently, a third embodiment will be described. The display control device 10 according to the first embodiment specifies a higher scroll speed as the moving distance calculated by the calculator 124 increases. However, when the scroll speed is too high, there is a problem that it is difficult to display a partial image at a position desired by the driver. Therefore, the display control device 10 according to the third embodiment changes the position of the display area with the scroll speed as the constant speed when the moving distance exceeds the second predetermined distance. Hereinafter, the display control device 10 according to the third embodiment will be described.

  In the third embodiment, when the movement distance calculated by the calculation unit 124 is equal to or less than the second predetermined distance, the display control unit 125 displays the display area in the display image displayed on the display device 2 at a scroll speed equal to or lower than the predetermined scroll speed. Change the position of. When the movement distance calculated by the calculation unit 124 is longer than the second predetermined distance, the display control unit 125 changes the position of the display area in the display image displayed on the display device 2 at a predetermined scroll speed.

  FIG. 11 is a diagram illustrating a relationship between a moving distance and a predetermined scroll speed according to the third embodiment. Note that Bp shown in FIG. 11 indicates a reference position. If the movement distance in the horizontal axis direction calculated by the calculation unit 124 is equal to or less than the third distance Dx3 shown in FIG. 11, the display control unit 125 sets the scroll speed equal to or less than a predetermined scroll speed based on the movement distance. Then, the scroll speed in the horizontal axis direction is specified so that the scroll speed becomes higher as the moving distance becomes longer. Similarly, when the moving distance in the vertical axis direction calculated by the calculating unit 124 is equal to or less than the fourth distance Dy4 shown in FIG. 11, the display control unit 125 sets the scroll speed equal to or less than a predetermined scroll speed based on the moving distance. The scroll speed in the vertical axis direction is specified so that the scroll speed becomes higher as the moving distance becomes longer.

  When the movement distance in the horizontal axis direction calculated by the calculation unit 124 is longer than the third distance Dx3 shown in FIG. 11, the display control unit 125 determines the display area at a predetermined scroll speed in the direction from the reference position to the reference point. Scroll quickly. In this case, the display control unit 125 specifies the scroll speed in the horizontal axis direction of the display area as the upper limit speed in the horizontal axis direction. In addition, the display control unit 125 specifies the scroll speed of the display area in the vertical axis direction based on the moving distance in the vertical axis direction calculated by the calculation unit 124. In the present embodiment, when the scroll speed in the horizontal axis direction reaches the upper limit speed in the horizontal axis direction, the display control unit 125 changes the scroll speed in the vertical axis direction to the scroll speed in the vertical axis direction at the time when the upper limit speed is specified. Fix it.

  When the movement distance in the vertical axis direction calculated by the calculation unit 124 is longer than the fourth distance Dy4 shown in FIG. 11, the display control unit 125 determines the display area at a predetermined scroll speed in the direction from the reference position to the reference point. Scroll quickly. In this case, the display control unit 125 specifies the scroll speed in the vertical axis direction of the display area as the upper limit speed in the vertical axis direction. Further, the display control unit 125 specifies the scroll speed of the display area in the horizontal axis direction based on the movement distance in the horizontal axis direction calculated by the calculation unit 124. In the present embodiment, when the scroll speed in the vertical axis direction reaches the upper limit speed in the vertical axis direction, the display control unit 125 changes the scroll speed in the horizontal axis direction to the scroll speed in the horizontal axis direction at the time when the upper limit speed is specified. Fix it.

  The display control unit 125 changes the position of the display area based on the specified scroll speed. Here, when displaying the partial image on the display device 2, the display control unit 125 determines whether the display area is scrolled at a constant speed at a predetermined scroll speed or a scroll determined based on the distance calculated by the calculation unit 124. Information for identifying whether scrolling is being performed depending on the speed may be displayed on the display device 2. For example, the display control unit 125 may cause the display device 2 to display a partial image and a mark for identifying whether or not the display area is scrolled at a constant speed. By confirming the mark, the driver can grasp whether or not the display area is moving at a constant speed.

<Effects according to Third Embodiment>
As described above, when the movement distance calculated by the calculation unit 124 is equal to or less than the second predetermined distance, the display control device 10 according to the third embodiment displays on the display device 2 at a scroll speed equal to or lower than the predetermined scroll speed. When the moving distance is longer than a second predetermined distance, the position of the display area is changed at a predetermined scroll speed. By doing so, the display control device 10 can suppress the scroll speed from becoming too high. Thus, the driver can easily display the desired partial image.

<Fourth embodiment>
[Performs constant-speed scrolling independently in the horizontal and vertical directions]
Subsequently, a fourth embodiment will be described. The display control device 10 according to the third embodiment is configured such that when the movement distance in the horizontal axis direction calculated by the calculation unit 124 is longer than the third distance Dx3, or when the movement distance in the vertical axis direction calculated by the calculation unit 124 is the fourth distance. When the distance is longer than the distance Dy4, the display area is scrolled at a predetermined speed at a predetermined scroll speed in a direction from the reference position to the reference point. However, the driver changes the moving speed in the vertical axis direction at the time of constant speed scrolling based on the moving distance in the horizontal axis direction, or changes the moving speed in the horizontal axis direction at the time of constant speed scrolling based on the moving distance in the vertical axis direction. Sometimes you want to change it. Thus, the display control device 10 according to the fourth embodiment performs the constant speed scroll independently in the horizontal axis direction and the vertical axis direction. Hereinafter, a display control device 10 according to the fourth embodiment will be described.

  In the fourth embodiment, when the moving distance in the horizontal direction calculated by the calculating unit 124 is longer than the third distance Dy3, the display control unit 125 sets the horizontal direction of the display area in the display image displayed on the display device 2. Is specified as the upper limit speed in the horizontal axis direction as the first scroll speed. When the moving distance in the vertical axis direction calculated by the calculating unit 124 is longer than the fourth distance Dy4, the display control unit 125 sets the vertical scrolling speed of the display area to the vertical scrolling speed as the second scrolling speed. Specify the upper limit speed in the axial direction.

  FIG. 12 is a diagram illustrating a relationship between a moving distance and a scroll speed according to the fourth embodiment. FIG. 12A is a diagram illustrating a relationship between a moving distance in the horizontal axis direction and a scroll speed in the horizontal axis direction. FIG. 12B is a diagram illustrating a moving distance in the vertical axis direction and scrolling in the vertical axis direction. It is a figure showing the relation with speed.

  As shown in FIG. 12A, when the movement distance in the horizontal axis direction calculated by the calculation unit 124 is equal to or less than the third distance Dx3, the display control unit 125 performs scrolling in the horizontal axis direction based on the movement distance. The speed is specified as a scroll speed equal to or lower than the upper limit speed Vmx of the scroll speed in the horizontal axis direction. As shown in FIG. 12A, the display control unit 125 specifies the scroll speed in the horizontal axis direction such that the scroll speed becomes higher as the moving distance in the horizontal axis becomes longer. In addition, as shown in FIG. 12A, when the movement distance in the horizontal axis direction calculated by the calculation unit 124 is longer than the third distance Dx3, the display control unit 125 specifies the scroll speed as the upper limit speed Vmx.

  Similarly, when the moving distance in the vertical axis direction calculated by the calculating unit 124 is equal to or less than the fourth distance Dy4, the display control unit 125 determines the vertical axis based on the moving distance as shown in FIG. The scroll speed in the direction is specified as a scroll speed equal to or lower than the upper limit speed Vmy of the scroll speed in the vertical axis direction. As shown in FIG. 12B, the display control unit 125 specifies the scroll speed in the vertical axis direction such that the scroll speed becomes higher as the moving distance in the vertical axis direction becomes longer. In addition, as shown in FIG. 12B, when the moving distance in the vertical axis direction calculated by the calculating unit 124 is longer than the fourth distance Dy4, the display control unit 125 specifies the scroll speed as the upper limit speed Vmy.

  In the present embodiment, the specification of the scroll speed in the horizontal axis direction and the specification of the scroll speed in the vertical axis direction are performed independently. Then, the display control unit 125 independently changes the position of the display area in the horizontal axis direction and the position in the vertical axis direction based on the specified horizontal scroll speed and vertical axis scroll speed.

  Here, when displaying the partial image on the display device 2, the display control unit 125 determines whether the scroll speed in the horizontal axis direction or the vertical axis direction is the upper limit speed or based on the distance calculated by the calculation unit 124. The display device 2 may display speed range identification information for identifying whether the scroll speed is a scroll speed. FIG. 13 is a diagram illustrating an example in which the speed range identification information according to the fourth embodiment is displayed on the display device 2. In FIG. 13, a region indicating a speed range and information indicating whether the current speed is the upper limit speed are displayed on the display device 2 together with the partial image as information indicating whether the current scroll speed is the upper limit speed. Is displayed.

  Specifically, FIG. 13 shows regions Ax1 to Ax3 indicating the range of the scroll speed in the horizontal axis direction, a mark Mx indicating which speed range the scroll speed in the horizontal axis belongs to, and a mark Mx in the vertical axis direction. Areas Ay1 to Ay3 indicating scroll speed ranges and marks My indicating which speed range the scroll speed in the vertical axis belongs to are displayed. The area Ax1 indicates a range in which the scroll speed in the horizontal axis direction is the scroll speed determined based on the distance in the horizontal axis direction calculated by the calculation unit 124. The regions Ax2 and Ax3 indicate ranges in which the scroll speed in the horizontal axis direction is the upper limit speed. The area Ay1 indicates a range in which the scroll speed in the vertical axis direction is the scroll speed determined based on the distance in the vertical axis direction calculated by the calculation unit 124. The areas Ay2 and Ay3 indicate ranges in which the scroll speed in the vertical axis direction is the upper limit speed. The driver confirms in which of the areas Ax1 to Ax3 the mark Mx is included and in which of the areas Ay1 to Ay3 the mark My is moved so that the display area moves at the upper limit speed. It can be grasped whether or not.

<Effects According to Fourth Embodiment>
As described above, the display control device 10 according to the fourth embodiment specifies the horizontal scrolling speed of the display area in the display image displayed on the display device 2 based on the calculated horizontal moving distance. The scroll speed in the vertical axis direction of the display area is specified based on the calculated moving distance in the vertical axis direction, and the horizontal axis of the display area is specified based on the specified scroll speed in the horizontal axis direction and the scroll speed in the vertical axis direction. The position in the direction and the position in the vertical axis direction are independently changed, and the display device 2 displays the partial image included in the display area in the display image. By doing so, the driver changes the moving speed in the vertical axis direction at the time of constant speed scrolling based on the moving distance in the horizontal axis direction, or changes the horizontal axis Or the speed of movement in the direction can be changed.

<Fifth embodiment>
[Scroll based on the scroll speed assigned to the area including the relative position between the reference position and the reference point]
Next, a fifth embodiment will be described. The display control device 10 according to the fifth embodiment is different from the first embodiment in that scrolling is performed based on a scroll speed assigned to an area including a relative position between a reference position and a reference point. Hereinafter, the display control device 10 according to the fifth embodiment will be described.

  The position specifying unit 123 according to the fifth embodiment specifies the position of a predetermined reference point on the driver's face in the image obtained by the obtaining unit 122, and determines the position of the reference point with respect to the predetermined reference position. Specify the relative position. For example, the position specifying unit 123 specifies the coordinates of the reference point when the reference position is the origin, thereby specifying the relative position of the reference point with respect to the reference position.

  The display control unit 125 specifies the scroll speed of the display area in the display image displayed on the display device 2 based on the relative position specified by the position specifying unit 123. The display control unit 125 changes the position of the display area based on the specified scroll speed, and causes the display device 2 to display a partial image included in the display area among the display images.

  FIG. 14 is a diagram illustrating a relationship between a relative position and a scroll speed according to the fifth embodiment. As shown in FIG. 14, in the fifth embodiment, rectangular regions A1 to A4 centered on the reference position Bp are defined as a plurality of regions. In two adjacent regions, the scroll speed associated with the outer region is higher than the scroll speed associated with the inner region. In the present embodiment, the shapes of the regions A1 to A4 are rectangular, but are not limited thereto. For example, the shape of the regions A1 to A4 may be a shape in which a vertex portion of a rectangle is rounded or a circular shape.

  Specifically, the area A1 is an area where the scroll speed is specified based on the relative position from the reference position Bp. The maximum scroll speed in the area A1 is the first scroll speed. For example, the first scroll speed is set at the vertex of the rectangle indicating the area A1. Also, a first scroll speed is assigned to the area A2. A second scroll speed higher than the first scroll speed is assigned to the area A3. A third scroll speed higher than the second scroll speed is assigned to the area A4.

  The display control unit 125 changes the position of the display area based on the scroll speed corresponding to the area including the relative position specified by the position specifying unit 123 among the plurality of areas A1 to A4. For example, when the region including the relative position specified by the position specifying unit 123 is the region A3 illustrated in FIG. 14, the display control unit 125 associates the region from the reference position to the reference point with the region A3. The display area is changed according to the scroll speed.

  Further, when the position of the reference point moves from the vertex of the rectangle indicating the area A1 to the area A2, the scroll speed is smoothly switched to the first scroll speed. Therefore, the display control device 10 can switch the scroll speed without giving the driver an uncomfortable feeling.

<Effects according to Fifth Embodiment>
As described above, the display control device 10 according to the fifth embodiment specifies the relative position of the reference point predetermined on the user's face with respect to the reference position, and determines the scroll speed of the display area based on the relative position. Identify. Then, the display control device 10 changes the position of the display area in the display image based on the specified scroll speed, and causes the display device 2 to display a partial image included in the display area in the display image. By doing so, the driver can easily change the display area of the display image by changing the position of his / her face with respect to the display device 2.

  As described above, the present invention has been described using a plurality of embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. For example, the above embodiments may be combined. For example, the second embodiment and the third embodiment may be combined with the first embodiment, or the second embodiment and the fourth embodiment may be combined with the first embodiment. Note that the example of the combination of the embodiments is merely an example, and combinations of the embodiments other than the above-described combinations may be performed.

  In addition, the display device 2 may be a display of a personal computer, in addition to the display unit provided on the vehicle V or the mobile terminal 20 on the vehicle V. It is apparent to those skilled in the art that various changes or improvements can be added to the above embodiment. It is apparent from the description of the appended claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Imaging device 2 ... Display device 3 ... Operation button 10 ... Display control device 11 ... Storage part 12 ... Control part 121 ... Operation reception part 122 ... Acquisition part 123 position specifying unit 124 calculating unit 125 display control unit 20 portable terminal 21 imaging unit 22 input unit 23 display unit 24 storage unit 25 ... Control part 251 ... Operation reception part 252 ... Acquisition part 253 ... Position identification part 254 ... Calculation part 255 ... Display control part V ... Vehicle

Claims (6)

An acquisition unit configured to acquire an image of a user captured by an imaging unit provided at a position fixed to a position of a display unit that displays an image,
In the image obtained by the obtaining unit, a position specifying unit that specifies a position of a predetermined reference point on the user's face,
The distance between the position of the reference point identified by the position identification unit and a reference position that is predetermined with respect to the reference point, in the horizontal axis direction defined with respect to the display surface of the display unit. A distance and a calculation unit that calculates a distance in the vertical axis direction defined with respect to the display surface,
The scrolling speed in the horizontal axis direction, which is the moving speed in the horizontal axis direction of the display area in the display image displayed on the display unit based on the distance in the horizontal axis direction calculated by the calculation unit, is specified. The scroll speed in the vertical axis direction, which is the moving speed in the vertical axis direction of the display area, is specified based on the calculated distance in the vertical axis direction, and the specified scroll speed in the horizontal axis direction and the vertical axis direction are determined. A display in which the horizontal position and the vertical position of the display area are independently changed based on the scroll speed of the display area, and a partial image included in the display area among the display images is displayed on the display unit. A control unit;
A display control device comprising: The display control unit, when the distance in the horizontal axis direction calculated by the calculation unit is shorter than a first distance, does not change the position of the display area in the horizontal axis direction, the calculation unit calculated When the distance in the vertical axis direction is shorter than the second distance, control is performed so that the position of the display area in the vertical axis direction is not changed.
The display control device according to claim 1. The display control unit, when the distance in the horizontal axis direction calculated by the calculation unit is longer than a third distance, specifies the scroll speed in the horizontal axis direction of the display area as a first scroll speed, and When the distance in the vertical axis direction calculated by the unit is longer than a fourth distance, the scroll speed in the vertical axis direction of the display area is specified as a second scroll speed,
The display control device according to claim 1. The display control unit, when the distance in the horizontal axis direction calculated by the calculation unit is equal to or less than the third distance, based on the distance in the horizontal axis direction calculated by the calculation unit, Identifying an axial scroll speed, and when the distance in the vertical axis direction calculated by the calculation unit is equal to or less than the fourth distance, the display area is determined based on the distance in the vertical axis direction calculated by the calculation unit. Specifying the scroll speed in the vertical axis direction of
The display control device according to claim 3. The display control unit moves the display area in a direction opposite to a direction of the reference point with respect to the reference position,
The display control device according to claim 1. Computer runs,
Acquiring a user image captured by an imaging unit provided at a position fixed with respect to a position of the display unit that displays the image;
Specifying a position of a reference point predetermined on the face of the user in the acquired image;
The position of the specified reference point, and a distance between a reference position predetermined with respect to the reference point, the distance in the horizontal axis direction with respect to the display surface of the display unit, Calculating a vertical distance defined with respect to the display surface;
The scrolling speed in the horizontal axis direction, which is the moving speed in the horizontal axis direction of the display area in the display image displayed on the display unit based on the calculated distance in the horizontal axis direction, is specified, and the calculated vertical axis is The scroll speed in the vertical axis direction, which is the moving speed in the vertical axis direction of the display area in the display image displayed on the display unit based on the distance in the direction, is specified, and the specified scroll speed in the horizontal axis direction and the vertical direction are specified. Based on the scroll speed in the axial direction, the position in the horizontal direction and the position in the vertical direction of the display area are independently changed, and the partial image included in the display area among the display images is displayed on the display unit. The step of causing
A display control method comprising: