JP2020006954A - Drive recorder, captured image display device, captured image display method, captured image display program and storage medium - Google Patents

Abstract

To provide an imaging device fitted to a room mirror and capable of preferably imaging a front scenery of a vehicle.SOLUTION: A drive recorder 1 is fitted to a room mirror 2 that is installed to a vehicle, and includes a mirror part 3 and a camera 11. The camera 11 has an imaging direction inclined in a horizontal direction only by 20° relative to a normal direction in a center location of a mirror surface of the mirror part 3. In this case, the camera 3 has the imaging direction that is substantially same as a front direction of the vehicle while the mirror part 3 is adjusted to a use state.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technique for photographing a scene in front of a vehicle.

  2. Description of the Related Art Conventionally, a room mirror integrally provided with a camera for photographing a scene in front of a vehicle has been known. For example, Patent Literature 1 discloses a camera-equipped room mirror in which a camera is installed in an internal space of a case forming a room mirror, and a shooting direction of the camera is fixed regardless of an angle adjustment of the room mirror. I have.

JP 2007-022495A

  In Patent Document 1, there is a problem that a space for eliminating interference between the camera and the case of the rear-view mirror is required, and the size of the rear-view mirror case is increased.

  SUMMARY An advantage of some aspects of the invention is to provide an imaging device which is mounted on a rearview mirror and can appropriately capture a scene in front of a vehicle.

The invention according to claim is a drive recorder that displays a captured image acquired by an imaging unit mounted on a vehicle, wherein the display unit displays the captured image, an imaging time of the captured image, and the imaging Character information indicating at least one of the traveling speeds of the vehicle at the time of capturing an image, a display control unit that causes the display unit to display the captured information on the captured image, and the display unit is disposed on a front surface of the display unit. A mirror unit that transmits a part of light of an image to be displayed, an acceleration detection unit that detects acceleration, and a main unit that includes the display unit, the display control unit, the mirror unit, and the acceleration detection unit, A mounting portion that is mounted so as to overlap with the mirror surface of the room mirror, wherein the mounting portion adjusts the mounting direction of the main body portion from the first direction and the first direction along the mirror surface of the room mirror. The display control unit can be mounted in the rotated second direction, and the display control unit sets a rotation direction of the character information to be displayed on the display unit based on a direction of the gravitational acceleration detected by the acceleration detection unit. It is characterized by.
Further, the invention according to the claims is a photographed image display device mounted on a room mirror mounted on a vehicle and displaying a captured image acquired by an image pickup unit mounted on the vehicle, wherein the captured image display The mounting direction of the device to the rearview mirror, a mounting portion that can be mounted in a first direction and a second direction that is opposite to the first direction, and a mirror portion that allows the user to visually recognize the rear. A display unit configured as a part of the mirror unit, and a display control unit that adds text or graphics to the captured image and causes the display unit to display the captured image, and the display control unit includes the captured image display device. The display direction of the text or the graphic is rotated based on the direction of gravity acting on the object.
Further, the invention described in the claims can be mounted in the first direction and a second direction which is opposite to the first direction with respect to the mounting direction of the vehicle to the rearview mirror, and mounted on the vehicle A captured image display method executed by a captured image display device that displays a captured image acquired by a captured imaging unit on a display unit configured as a part of a mirror unit that allows a user to visually recognize the back, A display control step of adding a text or a graphic to the captured image and displaying the text or the graphic on the display unit, wherein the display control step is based on a direction of gravity acting on the captured image display device. The display direction is rotated.
Further, the invention according to the claims is a captured image display program, wherein the mounting direction of the vehicle to the rearview mirror can be mounted in a first direction and a second direction which is opposite to the first direction. And a computer having a captured image display device that displays a captured image acquired by an imaging unit mounted on the vehicle on a display unit that is configured as a part of a mirror unit that allows a user to visually recognize the vehicle from behind. Executing a display control step of adding a text or a graphic to the captured image and displaying the text or graphic on the display unit, wherein the display control step is based on a direction of gravity acting on the captured image display device. The display direction of the figure is rotated.

1 shows a front view and a rear view of a drive recorder. FIG. 2 shows a top view of the drive recorder. FIG. 2 shows a block diagram of a drive recorder. FIG. 3 shows a top view and a side view of the inside of the vehicle when the vehicle is a right-hand drive. FIG. 4 is a diagram illustrating a relationship between a captured image and a cut-out image. It is a display example of a display. FIG. 3 shows a rear view and a top view of the drive recorder when the vehicle has a left steering wheel. It is a schematic structure figure of a system concerning a modification.

  According to one preferred embodiment of the present invention, there is provided a photographing apparatus mounted on a rearview mirror mounted on a vehicle for photographing a scene in front of the vehicle, comprising: a mirror unit; A photographing unit having a photographing direction inclined by a first angle in the horizontal direction with respect to the line direction, wherein the first angle is a photographing direction of the photographing unit when the mirror unit is adjusted to a use state. Is set to an angle that substantially matches the front direction of the vehicle.

  The photographing device is mounted on a room mirror provided in the vehicle, and includes a mirror unit and photographing means. The photographing means has a photographing direction inclined by a first angle in a horizontal direction with respect to a normal direction at a center position of the mirror surface of the mirror section. Here, the first angle is set to an angle at which the photographing direction of the photographing means substantially coincides with the front direction of the vehicle when the mirror unit is adjusted to the use state. Here, "the angle at which the photographing direction of the photographing means substantially matches the front direction of the vehicle" refers to, for example, an angle at which the photographing direction of the photographing means falls within a difference of 10 degrees from the front direction of the vehicle. According to this aspect, the photographing device can appropriately photograph the scene in front of the vehicle centering on the front direction in a state where the mirror unit is adjusted to the use state by the driver.

  In one aspect of the imaging device, the imaging device includes an acceleration sensor that detects acceleration, and an image control unit that outputs an image obtained by cutting out a part of an image captured by the imaging unit based on an output of the acceleration sensor. And. According to this aspect, the photographing device can appropriately recognize the inclination of the photographing device or the like based on the output of the acceleration sensor, and can appropriately cut out a portion showing the front direction of the vehicle from the photographed image and output the cutout.

  In another aspect of the photographing device, the photographing device is configured such that the image control means is based on an angle difference between the normal direction and the front direction of the vehicle, which is calculated based on an output of the acceleration sensor. The center position of the image output by the image control means is changed. According to this aspect, the photographing apparatus can appropriately cut out a portion showing the front direction of the vehicle from the photographed image and output it.

  In another aspect of the photographing device, the photographing device includes a detecting unit that detects a vanishing point in an image photographed by the photographing unit, and the vanishing point detected by the detecting unit. Image control means for cutting out and outputting a part of the photographed image. According to this aspect as well, the imaging device can appropriately cut out the portion showing the front direction of the vehicle from the captured image and output the cutout.

  In another aspect of the imaging device, the imaging device includes a display unit configured as a part of the mirror unit, and the display unit displays an image output by the image control unit. According to this aspect, the photographing device can appropriately make the driver visually recognize an image of the scene in front of the vehicle.

  In another aspect of the imaging device, the imaging device includes a non-volatile memory for storing an image, and the non-volatile memory is rotated based on a direction of gravity applied to a mirror surface direction of the mirror unit. The output image of the image control means is stored. According to this aspect, it is possible to always store the image of the front scene viewed from the front in the nonvolatile memory regardless of the manner in which the imaging device is attached to the rearview mirror.

  In another aspect of the photographing device, the photographing device includes a superimposing unit that superimposes a text or a figure on an image photographed by the photographing unit and outputs the superimposed text or graphic, and the superimposing unit is disposed in a mirror direction of the mirror unit. The direction of the text or figure is rotated based on the direction of the applied gravity. According to this aspect, the photographing apparatus can appropriately set the direction of the text or graphic to be superimposed on the image photographed by the photographing means.

  In another aspect of the photographing apparatus, the photographing means has a photographing direction inclined with respect to the normal direction by the first angle that is an angle in a range of 10 ° to 30 °. According to this aspect, in the use state after the angle adjustment, the imaging device can appropriately capture the scenery in front of the vehicle in the front direction.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Hereinafter, the “photographing direction” is a direction facing the front of the camera and refers to a direction passing through the center of the field of view (photographing range) of the camera.

[Schematic configuration]
FIG. 1 shows a drive recorder 1 according to the present embodiment. Specifically, FIG. 1A shows a front view in a state in which the drive recorder 1 is mounted on a room mirror 2 in a vehicle interior (also simply referred to as a “mounted state”), and FIG. FIG. 2 shows a rear view of the drive recorder 1 in a mounted state. Hereinafter, the longitudinal direction of the drive recorder 1 is referred to as “Y-axis direction”, the lateral direction of the drive recorder 1 is referred to as “Z-axis direction”, and directions perpendicular to the Y-axis and Z-axis are referred to as “X-axis direction”. Is defined as shown in the figure.

  The drive recorder 1 illustrated in FIG. 1 mainly includes a mirror unit 3, a camera (photographing unit) 11, a display (display unit) 10 located on the back of the mirror unit 3, and holding units 16A to 16D. The drive recorder 1 is fixed to the room mirror 2 by the holding units 16A to 16D holding the room mirror 2 in the mounted state. When the drive recorder 1 is mounted, the mirror surface of the room mirror 2 and the rear surface of the drive recorder 1 overlap.

  FIG. 1 shows the mounted state of the drive recorder 1 when the vehicle is a right-hand drive. When the vehicle is a left-hand drive, the drive recorder 1 is rotated by 180 ° on the YZ plane from FIG. Is mounted on the rearview mirror 2. The case where the vehicle has a left-hand drive will be described in detail in the section "Left-Handle Response".

  The mirror unit 3 is, for example, a half mirror, and transmits some of the incident light and reflects other light. Thus, the mirror unit 3 functions as a normal mirror that reflects the scene behind the vehicle when the display 10 on the rear surface is in a non-light emitting state, and transmits light emitted from the display 10 when the display 10 is in a light emitting state. Then, the driver visually recognizes the display content of the display 10.

  The display 10 displays an image cut out from an image shot by the camera 11 (also called a “shot image Im”) (also called a “cut-out image Imc”). As described later, the cut-out image Imc is an image cut out from the photographed image Im such that the front scenery in front of the vehicle is at the center of the image, and has a smaller number of vertical and horizontal pixels than the photographed image Im. The display 10 also displays an image (also referred to as a “guidance image”) representing characters, figures, and the like for guiding the driver on the cut-out image Imc. In FIG. 1A, the display 10 displays a guide image indicating the vehicle speed and a square frame guide image in which the lit signal lights are emphasized, superimposed on the cut-out image Imc.

  The camera 11 is disposed on a rear portion of the drive recorder 1 which does not overlap with the rear-view mirror 2 when the drive recorder 1 is mounted. The shooting direction of the camera 11 (that is, the direction of the camera 11) is inclined by 20 ° in the horizontal direction with respect to a normal line (also referred to as a normal line “Ln”) at the center position of the mirror surface of the mirror unit 3. I have. Here, the above-mentioned “20 °” is a standard left-right inclination angle when the driver of the general physique sets the inclination of the room mirror 2, and is the “first angle” of the present invention. This is an example. Thus, in a state where the driver has adjusted the angle of the drive recorder 1, the photographing direction of the camera 11 substantially matches the front direction (front direction) of the vehicle. This will be described with reference to FIG.

  FIG. 2 shows a top view of the drive recorder 1. In the example of FIG. 2, the drive recorder 1 is tilted counterclockwise by 20 ° so that the mirror unit 3 of the drive recorder 1 is directed to the driver.

  Here, as shown in FIG. 2, the shooting direction of the camera 11 indicated by the arrow 41 is inclined clockwise (clockwise) by 20 ° with respect to the normal Ln on the horizontal plane (ie, the XY plane). The normal Ln is tilted counterclockwise (counterclockwise) by 20 ° on the horizontal plane with respect to the front direction of the vehicle due to the angle adjustment of the mirror unit 3 by the driver. As a result, in the example of FIG. 2, the shooting direction of the camera 11 indicated by the arrow 41 matches the front direction of the vehicle.

  Hereinafter, the installation state of the drive recorder 1 shown in FIG. 2, that is, the normal Ln is inclined counterclockwise in the XY plane by 20 ° with respect to the front direction of the vehicle, and the drive recorder 1 is perpendicular to the horizontal plane. Such a state is also called a “reference state”.

  FIG. 3 is a functional block diagram of the drive recorder 1. As shown in FIG. 3, the drive recorder 1 includes a display 10, a camera 11, an acceleration sensor 12, a nonvolatile memory 13, and a control unit 14.

  The acceleration sensor 12 detects accelerations in three directions of the X axis, the Y axis, and the Z axis, and supplies detection signals to the control unit 16. The non-volatile memory 13 is a storage medium such as an SD card, for example, and stores the captured image Im generated by the camera 11 or the cut-out image Imc displayed on the display 10 under the control of the control unit 14.

  The control unit 14 includes a CPU (Central Processing Unit), a ROM (Read Only Memory) for storing a control program executed by the CPU, data, and the like, and a RAM (Random) for sequentially reading and writing various data as a work memory when the CPU operates. Access Memory) and performs general control of the drive recorder 1.

  For example, the control unit 14 overwrites the captured image Im or the cut-out image Imc for a predetermined time in the temporary memory, and when the acceleration sensor 12 detects an acceleration equal to or more than a predetermined value, the captured image Im or the cut-out image The image Imc is written to the nonvolatile memory 13. The control unit 14 performs various recognition processes such as detection of a vehicle ahead, detection of a lane, and detection of a lighting color of a traffic signal based on the captured image Im by a known image recognition technology, and provides guidance based on the recognition result. The image is superimposed on the cut-out image Imc and displayed on the display 10. The control unit 14 is an example of the “image control unit” and the “superimposition unit” in the present invention.

[Generation method of cutout image Imc]
Next, a method of generating the cut-out image Imc will be described. Schematically, the control unit 14 determines the center position of the cut-out image Imc on the captured image Im based on the difference between the inclination of the normal Ln in the horizontal direction and the vertical direction when compared with the reference state illustrated in FIG. To move. Thereby, even when the drive recorder 1 in the mounted state is adjusted in angle according to the physique or the like of the driver, the control unit 14 suitably generates the cutout image Imc centering on the front direction of the vehicle, and displays the cutout image Imc. 10 is displayed.

  Hereinafter, a case where the vehicle is a right-hand drive will be described. The control unit 14 determines whether the drive recorder 1 is mounted on the right-hand drive or the left-hand drive based on, for example, acceleration in the Z-axis direction (ie, gravitational acceleration) output from the acceleration sensor 12.

  FIG. 4A shows a top view of the inside of the vehicle when the vehicle is a right-hand drive. FIG. 4B is a side view of the vehicle when the vehicle is a right-hand drive.

  In this case, first, the control unit 14 is based on the output of the acceleration sensor 12, and the inclination angle of the normal Ln to the front direction of the vehicle on the horizontal plane (also referred to as “horizontal inclination angle θh”; see FIG. 4A). ) And the elevation angle of the normal Ln with respect to the horizontal plane (also referred to as “vertical tilt angle θv”; see FIG. 4B). In this case, preferably, the control unit 14 calculates a statistic for a predetermined period such as a moving average for each of the output values of the X, Y, and Z axes of the acceleration sensor 12, and based on the calculated statistic. The horizontal tilt angle θh and the vertical tilt angle θv may be calculated.

  Next, the control unit 14 determines the center position of the cut-out image Imc on the captured image Im according to the difference between the detected horizontal tilt angle θh and the horizontal tilt angle θh in the reference state (ie, 20 °). From the center position of. The control unit 14 also determines the center position of the cut-out image Imc on the captured image Im according to the difference between the detected vertical tilt angle θv and the vertical tilt angle θv in the reference state (that is, 0 °). Shift vertically from the center position. This will be described with reference to FIG.

  FIG. 5 is a diagram illustrating a positional relationship between the captured image Im and the cut-out image Imc. In FIG. 5, the position "Pimc" indicates the center position of the cut-out image Imc, and the position "Pim" indicates the center position of the captured image Im. The horizontal width and the vertical width of the cut-out image Imc are set shorter than the photographed image Im in consideration of the possible angles of the horizontal tilt angle θh and the vertical tilt angle θv.

  In the example of FIG. 5, the control unit 14 determines that the horizontal tilt angle θh detected by the acceleration sensor 12 is larger by a predetermined angle than the horizontal tilt angle θh in the reference state (ie, 20 °), and responds to the predetermined angle. The center position Pimc is shifted from the center position Pim to the right by the distance “Lh”. In this case, the control unit 14 stores, for example, a map or an expression indicating an appropriate set value of the distance Lh for each candidate value of the above-described predetermined angle in advance, and refers to the map or the like to determine the distance Lh. Set. On the other hand, when the detected horizontal tilt angle θh is smaller than the horizontal tilt angle θh in the reference state, the control unit 14 moves the center position Pimc leftward from the center position Pim in accordance with the angle difference between these horizontal tilt angles θh. Shift to

  Similarly, in the example of FIG. 5, the control unit 14 determines that the vertical tilt angle θv detected by the acceleration sensor 12 is larger by a predetermined angle than the vertical tilt angle θv in the reference state (that is, 0 °), and The center position Pimc is shifted from the center position Pim by a distance “Lv” corresponding to the angle. In this case, the control unit 14 stores, for example, a map or an expression indicating an appropriate set value of the distance Lv for each candidate value of the above-described predetermined angle in advance, and refers to the map or the like to determine the distance Lv. Set. When the detected vertical tilt angle θv is smaller than the vertical tilt angle θv in the reference state, the control unit 14 sets the center position Pimc above the center position Pim according to the angle difference between these vertical tilt angles θv. Shift to

  In the example of FIG. 5, as a result of moving the center position Pimc based on the horizontal tilt angle θh and the vertical tilt angle θv, the center position of the cut-out image Imc is such that the shooting direction of the camera 11 matches the front direction of the vehicle. In this case, it coincides with the center position of the photographed image Im photographed. That is, the control unit 14 determines the cutout range of the cutout image Imc such that the vanishing point on the extension of the front direction of the vehicle is located at the center position of the cutout image Imc.

  FIG. 6 is a display example of the display 10 on which the cut-out image Imc shown in FIG. 5 is displayed. As shown in FIG. 6, the control unit 14 displays the cut-out image Imc generated based on the vertical tilt angle θv and the horizontal tilt angle θh on the display 10 and displays the guide images 80 and 81 for guiding the driver. Is displayed. In FIG. 6, the control unit 14 cuts out a guide image 80 that surrounds the lit signal light recognized based on the captured image Im and a guide image 81 that indicates the vehicle speed acquired based on the output of a distance sensor or the like (not shown), from the cutout image Imc. Is superimposed.

  As shown in FIG. 6, even when the drive recorder 1 is appropriately angle-adjusted from the reference state shown in FIG. 2 according to the physique and the like of the driver, the control unit 14 keeps the same direction as the driver's line of sight. It is possible to generate a cut-out image Imc whose direction is the shooting direction and display the cut-out image Imc on the display 10. Furthermore, since the camera 3 is tilted in advance so that the photographing direction of the camera 3 substantially matches the front direction of the vehicle when the mirror unit 3 is adjusted to the use state, the pixels of the photographed image Im and the cut-out image Imc It is possible to bring the numbers closer. That is, it is possible to display an image showing the front direction of the vehicle without extremely degrading the resolution of the cut-out image Imc displayed on the display 10.

[Correspondence to left handle]
Next, a case where the vehicle is a left-hand drive will be described. FIG. 7A shows a rear view of the drive recorder 1 when the vehicle has a left handle, and FIG. 7B shows a top view of the drive recorder 1 when the vehicle has a left handle.

  As shown in FIG. 7A, when the vehicle is a left-hand drive, the drive recorder 1 is rotated 180 ° on the YZ plane from the state of FIG. 1B when the vehicle is a right-hand drive. It is attached to the room mirror 2. In this case, the drive recorder 1 is mounted on the rear-view mirror 2 with the holding portions 16A and 16B sandwiching the lower end position of the room mirror 2 and the holding portions 16C and 16D sandwiching the upper end position of the room mirror 2.

  In this case, as shown in FIG. 7B, the shooting direction of the camera 11 indicated by the arrow 41 is inclined counterclockwise (counterclockwise) by 20 ° on the XY plane with respect to the normal Ln. In FIG. 7B, the normal Ln is inclined clockwise (clockwise) by 20 ° on the XY plane with respect to the front direction of the vehicle. Therefore, in the state shown in FIG. 7B, the shooting direction of the camera 11 indicated by the arrow 41 substantially coincides with the front direction of the vehicle.

  Then, the control unit 14 regards the state illustrated in FIG. 7B as the reference state, and determines the center position of the cut-out image Imc in the captured image Im, as in the description of FIGS. 4 and 5. Specifically, the control unit 14 determines the horizontal tilt angle θh (ie, 20 °) and the vertical tilt angle θv (ie, 0 °) in the reference state, and the horizontal tilt angle θh and the vertical tilt angle θv detected by the acceleration sensor 12. The center position of the cut-out image Imc on the photographed image Im is determined based on each angle difference.

  After determining the range of the cut-out image Imc, the control unit 14 displays the cut-out image Imc on the display 10 without inverting the cut-out image Imc. Here, since the display 10 and the camera 11 are both upside down as compared to the case of the mounted state in the right-hand drive vehicle, the control unit 14 allows the driver to visually recognize the cutout image Imc in the correct direction.

  Further, the control unit 14 displays the guide image to be superimposed on the cut-out image Imc on the display 10 so as to be superimposed on the cut-out image Imc while being rotated by 180 °. In this case, the control unit 14 is not limited to the guide image (for example, the guide image 80 in FIG. 6) generated in association with the image recognition result, but also provides a guide indicating various information such as an operation menu, the current time, and the traveling speed of the vehicle. The image (for example, the guide image 81 in FIG. 6) is also rotated 180 ° and displayed so as to overlap the cut-out image Imc. As a result, the control unit 14 allows the driver to visually recognize the guide image by superimposing it on the cut-out image Imc in an appropriate direction.

  Further, when recording the photographed image Im or the cut-out image Imc in the nonvolatile memory 13, the control unit 14 rotates the photographed image Im or the cut-out image Imc to be recorded in the nonvolatile memory 13 by 180 °, and then stores it in the nonvolatile memory 13. Record. By doing so, when taking out the nonvolatile memory 13 from the drive recorder 1 and reproducing the captured image Im or the cut-out image Imc recorded in the nonvolatile memory 13 by a PC or the like, the captured image Im or the cut-out image Imc is It is possible to preferably suppress the display from being turned upside down.

  As described above, the drive recorder 1 according to the present embodiment is mounted on the rearview mirror 2 mounted on the vehicle, and includes the mirror unit 3 and the camera 11. The camera 11 has a shooting direction inclined by 20 ° in the horizontal direction with respect to the normal direction at the center position of the mirror surface of the mirror unit 3. In this case, in a state where the mirror unit 3 is adjusted to the use state, the shooting direction of the camera 3 substantially matches the front direction of the vehicle. Therefore, the drive recorder 1 can preferably photograph a scene in front of the vehicle centering on the front direction when the vehicle is running.

[Modification]
Hereinafter, modified examples suitable for the above-described embodiment will be described. The following modifications may be arbitrarily combined and applied to the above embodiment.

(Modification 1)
In FIG. 2 and the like, the camera 11 is tilted by 20 ° with respect to the normal Ln in the longitudinal direction of the drive recorder 1. However, the installation angle of the camera 11 to which the present invention can be applied is not limited to this. Instead, the camera 11 is tilted in the longitudinal direction of the drive recorder 1 with respect to the normal Ln within a range of 10 ° to 30 ° which is the adjustment range of the rearview mirror 2 of a general driver. I just need.

(Modification 2)
In the description of the section “Generation method of cutout image”, the control unit 14 determines the center position of the cutout image Imc in the captured image Im based on the detected horizontal tilt angle θh and the detected vertical tilt angle θv. Alternatively, the control unit 14 may detect a vanishing point from the captured image Im by a known method, and determine the range of the cut-out image Imc such that the detected vanishing point is the center.

  In this case, preferably, the control unit 14 calculates the position of the vanishing point in the captured image Im captured when traveling on a flat and straight road by a statistical method, and fixes it as the center position of the cut-out image Imc. . For example, the control unit 14 calculates vanishing points on the photographed image Im for a plurality of photographed images Im in which the output of the acceleration sensor 12 at the time of photographing the photographed image Im is within a predetermined range, and calculates the calculated vanishing point. The average position of the points is determined as the center position of the cut-out image Imc. By doing so, the control unit 14 can cut out the captured image Im even when the vanishing point in the captured image Im frequently moves while traveling on a rough road or an uneven road. Frequent changes in the relative position of the image Imc can be suitably suppressed. In the present modified example, the control unit 14 is an example of the “detection unit” in the present invention.

(Modification 3)
The drive recorder 1 can be mounted on the rear-view mirror 2 and has only a photographing function by the camera 11 and does not have to have a display function by the display 10 and an image recording function by the nonvolatile memory 13.

  FIG. 8 shows an outline of a system according to a modification. In the example of FIG. 8, the drive recorder 1 is connected to the server device 6 via a network. Then, the drive recorder 1 transmits the captured image Im or the cut-out image Imc to the server device 6 when the acceleration sensor 12 detects acceleration equal to or more than a predetermined value.

(Modification 4)
The drive recorder 1 may determine which of the captured image Im and the cut-out image Imc is to be stored in the nonvolatile memory 13 based on a user input to an input unit (not shown). When the cut-out image Imc is stored in the non-volatile memory 13 based on a user input, the drive recorder 1 can appropriately record a video that accurately captures the front direction of the vehicle. On the other hand, when the captured image Im is stored in the non-volatile memory 13 based on a user input, the drive recorder 1 can preferably record a video having a wide angle of view.

DESCRIPTION OF SYMBOLS 1 Drive recorder 2 Room mirror 3 Mirror part 6 Server device 10 Display 11 Camera 12 Acceleration sensor 13 Non-volatile memory 14 Control part

Claims (5)

A drive recorder that displays a captured image obtained by an imaging unit mounted on a vehicle,
A display unit for displaying the captured image,
A display control unit that displays, on the display unit, character information indicating at least one of the imaging time of the captured image and the traveling speed of the vehicle at the time of capturing the captured image, on the captured image.
A mirror unit disposed on the front of the display unit and transmitting a part of light of an image displayed by the display unit,
An acceleration detection unit that detects acceleration,
A mounting unit that mounts the display unit, the display control unit, the mirror unit, and a main unit including the acceleration detection unit so as to overlap a mirror surface of a room mirror of the vehicle,
With
The mounting unit can be mounted in a mounting direction of the main body unit in a first direction and a second direction rotated by 180 degrees along a mirror surface of the room mirror from the first direction, and the display control unit. A drive recorder that sets a rotation direction of the character information to be displayed on the display unit based on a direction of the gravitational acceleration detected by the acceleration detection unit. A captured image display device that is mounted on a room mirror provided in a vehicle and displays a captured image obtained by an imaging unit mounted on the vehicle,
A mounting portion that can be mounted in a first direction and a second direction that is opposite to the first direction, the mounting direction of the captured image display device to the room mirror,
A mirror unit that allows the user to visually recognize the back,
A display unit configured as a part of the mirror unit,
A display control unit that adds text or a graphic to the captured image and causes the display unit to display the captured image.
With
The captured image display device, wherein the display control unit rotates the display direction of the text or the graphic based on the direction of gravity acting on the captured image display device. A captured image that can be mounted in a first direction and a second direction that is opposite to the first direction with respect to the mounting direction of the vehicle on the rearview mirror, and is captured by an imaging unit mounted on the vehicle. A captured image display method executed by a captured image display device that displays on a display unit configured as a part of a mirror unit that allows a user to visually recognize the back,
A display control step of adding a text or a figure to the captured image and displaying the image on the display unit;
Including
The captured image display method, wherein the display control step includes rotating a display direction of the text or the graphic based on a direction of gravity acting on the captured image display device. A captured image that can be mounted in a first direction and a second direction that is opposite to the first direction with respect to the mounting direction of the vehicle on the rearview mirror, and is captured by an imaging unit mounted on the vehicle. To a computer having a captured image display device that displays on a display unit configured as a part of a mirror unit that allows a user to view the rear view,
A display control step of adding a text or a figure to the captured image and displaying the image on the display unit;
And execute
The display control step includes rotating the display direction of the text or the graphic based on the direction of gravity acting on the captured image display device.   A computer-readable recording medium storing the captured image display program according to claim 4.