JP3339298B2 - Vehicle view device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a function of selectively displaying images of left and right visual fields and a rear visual field in front of a vehicle, which are captured by a camera mounted on the vehicle, and presenting the images to a user (driver). More particularly, the present invention relates to a vehicle view device that can appropriately control output of a voice message when displaying an image.

[0002]

2. Related Background Art Recently, as shown in FIG. 1, a nose view camera 2 mounted on a front portion of a vehicle 1 images left and right visual fields LV and RV in front of the vehicle 1, and is mounted on a rear portion of the vehicle 1. A view device has been developed which assists safety confirmation by capturing an image of the rear view BV of the vehicle with the rear view camera 3 and displaying the image on a display provided in a driver's seat. Also, the display of this type of viewing device is
For example, the navigation image N is also used as a display of a navigation device using a GPS (Global Positioning System), and the navigation image N and the view images from the vehicle 1 (the images of the front left and right views LV and RV and the image of the rear view BV) are selected. It is also done to display it. The switching of these display images is performed, for example, in conjunction with the range switching of the transmission, and further in response to a switch operation by a user (driver).

That is, image display on a display is generally performed by road map information (navigation image) N which always corresponds to the position of the vehicle in accordance with the output of the navigation device.
Is displayed. When the nose-view mode is set by a switch operation, the left and right visual fields LV, R in front of the vehicle imaged by the nose-view camera 2
The image of V is displayed in place of the navigation image N as shown in FIG. 2, and when the transmission is shifted to the reverse range, an image BV of the rear view of the vehicle is used instead of the images.
Is displayed preferentially.

[0004] The nose-view mode is set by a switch operation of a user (driver) in order to confirm the situation on the left and right in front of the vehicle, for example, when trying to get out of an alley with poor visibility. And Nose View Camera 2
As shown in FIG. 2, the left and right view images LV and RV are displayed by dividing the display screen of the display into two parts, and the left view image LV is displayed in the left area and the right view image is displayed in the right area. This is done by displaying the RVs simultaneously.

[0005] In addition, the view device is activated and the front left and right field of view L
When displaying images of V and RV, for example, "Nose view is used to call attention to the special display form. Is output. Alternatively, when displaying an image of the rear view BV in conjunction with shifting to the reverse range of the transmission, the rear view is used to evoke a safety confirmation operation using the rear view image. Is output. The output of such a voice message clearly indicates that the display image on the display has been switched from the navigation image to the front left / right view or the rear view.

[0006]

The setting of the nose-view mode described above is not always performed when the transmission is shifted to the drive range. Incidentally, when the transmission is set to the reverse range, the view image of the rear view is preferentially displayed as described above, so that the transmission is shifted from the reverse range to another range (drive range or low range). It is only necessary to shift to the nose-view mode at the time of shifting to (Range).

On the other hand, if the nose-view mode is instructed while the parking range is set,
In response to this, a view image of the front left and right view is displayed, and accompanying this, "Nose view. Is output. Thereafter, when the transmission is shifted to move the vehicle forward, particularly in the case of an automatic transmission, the range is switched from the parking range to the reverse range, and further to the drive range via the neutral position. Then, in the process of switching the range, when the transmission is shifted to the reverse range, the view image of the rear view is temporarily displayed with priority, and "Rear view. Is output. After that, when the transmission is shifted from the reverse range to the drive range through the neutral position, the view image of the front left and right view is displayed again, and "Nose view. Is output.

[0008] Suppose that the shift speed of the transmission is high, and the rear view view display and the "rear view." Even if the switching to the drive range is completed before the voice message is output, the nose view mode is set again when the shift to the drive range is completed, and the view image of the front left and right view is displayed. At this time, "nose view. Is output again. Such repeated output of the voice message is perceived as troublesome for the user (driver), and causes a great discomfort. In particular, when the user (driver) does not intend to retreat the vehicle, the view image of the rear view of the vehicle is displayed, and further, after the nose view mode is temporarily released by a shift operation of the transmission, resetting is performed. Accordingly, the output of the voice message again causes a problem that it does not meet the intended purpose.

The present invention has been made in view of such circumstances, and an object of the present invention is to appropriately display a view image of a front left-right view and a rear view of a vehicle, and further relates to display of the view image. It is an object of the present invention to provide a vehicle view device that enables information presentation without discomfort by appropriately outputting a voice message.

[0010]

In order to achieve the above object, a vehicle view device according to the present invention comprises a first image pickup means for picking up left and right views in front of a vehicle, and a second image pickup means for picking up images in a rear view of the vehicle. 2 imaging means, and display means capable of selectively displaying images obtained by these imaging means,
Means for displaying an image of the left and right field of vision in front of the vehicle by the display means when the image display of the left and right field of vision in front of the vehicle is instructed, and a voice message to that effect when displaying the image of the left and right field of vision in front of the vehicle. Means for outputting, when the transmission of the vehicle is set to a reverse range, means for preferentially displaying an image of the rear view of the vehicle on the display means, particularly for the left and right view in front of the vehicle When the range of the transmission of the vehicle is switched in the image display mode, it is determined whether the switching is performed through the reverse range, and when passing through the reverse range, means for restricting re-output of the voice message is provided. It is characterized by having.

That is, when the range change of the transmission is performed after passing through the reverse range, by detecting this, the voice message after the range change is not output. According to a second aspect of the present invention, a determination as to whether or not switching of the range of the transmission of the vehicle according to the first aspect is through a reverse range is performed by detecting a shift position of the transmission. By detecting the operation state of the fixing release button with respect to the shift position, the operation can be performed simply and surely.

Further, the invention according to claim 3 is characterized in that when the range of the transmission is switched through a reverse range,
The image display of the rear view of the vehicle is prohibited, and the mode of the image display before the range switching is continued. That is, except when the range change of the transmission is performed for the reverse range, the image display of the rear view by the setting of the reverse range is prohibited, and the mode of the image display before the range change is continued even after the range change. Thus, for example, the image display mode of the front left / right view is prevented from being reset, and thereby the voice message is not output again.

[0014] Further, according to the present invention, when the transmission of the vehicle is set in a reverse range and an image display of the left and right view ahead of the vehicle is instructed, the reverse of the range of the transmission is performed. A switch from the range is detected, and an image of the left and right view ahead of the vehicle is displayed on the display means. In other words, when the image display of the front left and right views is instructed in a state where the transmission is set to the reverse range, the image display of the front left and right views and the effect at the time when the transmission is switched from the reverse range to another range. When a voice message is output, and the image display of the front left and right views is changed to the image display of the rear view by the setting of the reverse range, when the transmission is switched from the reverse range to another range, the front is re-started. It is characterized in that an image display of left and right views and a voice message to that effect are output.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a vehicle view device according to the present invention will be described with reference to the drawings. FIG. 3 shows a schematic block configuration of the apparatus of the embodiment.
Roughly, it comprises a view system 5, a navigation system 6, a control unit 7, and an information presenting unit 8. The view system 5 includes a nose view camera 2 provided at the front of the vehicle and a rear view camera 3 provided at the rear of the vehicle. As described above, the nose-view camera 2 captures and inputs the left and right views LV and RV in front of the vehicle, and the rear-view camera 3 captures and inputs the rear view BV of the vehicle. View
The image control unit 5a in the system 5 includes the cameras 2,
Front and left visual fields LV, each of which is imaged and input through
RV image (nose-view image) F and rear view BV
The brightness (brightness) and the brightness of the image (rear view image) B are adjusted to optimize the image. The images F and B optimized and controlled by the video control unit 5a are selectively output to the information presentation unit 8 under the control of the control unit 7 and displayed on the display 8a as described later. .

On the other hand, the navigation system 6 has functions such as a vehicle position detecting means 6a and a vehicle azimuth detecting means 6b. The navigation system 6 is provided on the ground surface in accordance with radio wave information from a satellite received by the GPS receiver 11. The reception position (own vehicle position) is detected, and the direction (vehicle direction) of the own vehicle is detected according to the rotational angular velocity information obtained from the gyro 12. Then, the navigation system 6 obtains the map data stored in the CD-ROM 13 or the like based on the detected information, for example, marks the own vehicle position on a road map around the own vehicle position, or displays the own vehicle position on the road map. The navigation image N is created by, for example, changing the display mode of the road indicating the optimal route from the vehicle position to the destination. The navigation image N obtained in this manner is selectively output to the information presenting section 8 under the control of the control unit 7 as described later, and is displayed on the display 8.
The image is displayed at a and presented to the user (driver).

The control unit 7
Captures operation information input by a user (driver) through an operation unit 15 including a keyboard, a touch panel, and the like, and further acquires various vehicle sensors 16 provided on the vehicle.
For example, input range information of the transmission, which is obtained from
It plays a role of controlling the operations of the above-described view system 5 and navigation system 6 and the operation of the information presentation unit 8 in association with each other. More specifically, the control unit 7 controls the switching of the video switching unit 17 in accordance with the user information instructed and input from the operation unit 15 and the vehicle information obtained from the vehicle sensor 16 to control the nose from the view system 5 described above. The view image F or the rear view image B and the navigation image N obtained from the navigation system 6 are selectively output to the display 8a, and the display image is switched.

Further, the control unit 7 drives the audio circuit 18 in connection with the above-mentioned switching of the video signal by the video switching unit 17, and for example, when displaying the nose-view image F on the display 8a, the "Nose-view. . When displaying the voice message "Rear view image B", "Rear view. Is output via the speaker 19. The output of the voice message may be to selectively output a voice message stored in advance, or to output the voice message by voice synthesis.

The control unit 7 basically displays a navigation image N obtained from the navigation system 6 on the display 8a to assist the driving of the vehicle. When the user (driver) sets and operates the nose-view mode via the operation unit 15, the control unit 7 detects this and displays the nose-view camera 2 on the display 8a instead of the navigation image N. The nose-view image F captured by is displayed. Further, when the transmission (automatic transmission) of the vehicle is set to the reverse range, the control unit 7 that obtains the setting information of the reverse range via the vehicle sensor 16 is provided by the control unit 7.
Has a function of displaying the rear view image B captured by the camera in preference to the navigation image N and the nose view image F.

In this apparatus configured as described above,
In particular, a characteristic function of the present invention that the control unit 7 has is a main control routine (not shown) that constantly controls the operation of the navigation system 6, selects the navigation image N, and displays it on the display 8a. One of the subroutines incorporated in the above is that the display control of the view image shown in the processing procedure shown in FIG. 4 is periodically executed.

The display control of the view image shown in FIG. 4 will be described. The processing procedure is first started by determining whether or not the transmission is set to the reverse range (R range) [Step S1]. . If the transmission is not set to the R range, the rear view camera 3 is turned off (stop operation) because there is no need for the above-described rear view display (step S2), and then the nose view mode is set. It is determined whether or not the setting has been made [Step S3]. The determination of the nose-view mode is made by determining whether or not the nose-view display is designated via the operation unit 15.

If the nose-view mode has not been set, the nose-view camera 2 is turned off (stopped) because there is no need to display a nose-view image [Step S4], and the main Return to the control routine. On the other hand, if it is determined in step S3 that the nose-view mode is set, then it is determined whether or not a control flag f described later is [0] [step S5]. This control flag f is initially set to [0] when the apparatus is started up. A value of [0] indicates that the nose-view display voice message is not output, and a value of [1] indicates the nose-view. This indicates that the displayed voice message has been output.
However, if the control flag f is [0], the above-mentioned "Nose view. [Step S6], the nose-view camera 2 is operated to select the nose-view image F captured by the camera 2, and displayed on the display 8a instead of the navigation image N. [Step S7]. If the control flag f is [1], the process goes through the step S6, that is, "Nose view. And the like, and outputs a nose-view image F picked up by the nose-view camera 2 without outputting a voice message, and displays it via the display 8a [Step S7].

After that, the control flag f is set because the voice message for performing the nose-view display is output and the display of the nose-view image F is started, or because the nose-view image F is already displayed. [1] is set [Step S8], and the process returns to the main control routine described above. On the other hand, when the setting of the R range is detected in the first step S1 to start this processing procedure, the nose-view camera 2 is temporarily moved to display the rear-view image B preferentially in response thereto. After the off (operation stop) control (step S9), it is determined whether or not the range fixing release button (shift lock release button) in the automatic transmission is operated (step S10). If the range fixing release button is not operated, it is determined that the shift of the transmission is prohibited (fixed) and the reverse range is set, and if the range fixing release button is operated, Determines that the transmission is in the process of being switched to another range via the reverse range.

In this way, the state of the reverse range is determined, and if it is confirmed that the transmission is truly set in the reverse range, a voice message to display the rear view image B is output [Step S11]. , Rear view camera 3
By operating this, the rear view image B captured by the camera 3 is selected and displayed on the display 8a prior to the navigation image N and the nose view image F [Step S12]. Thereafter, since the display image on the display 8a is switched to the rear view image B, the control flag f is reset to [0] and [Step S1].
3], and return to the main control routine described above.

On the other hand, if the operation of the range fixing release button is detected in step S10 and it is determined that the transmission only temporarily passes through the reverse range, the nose view mode is set. It is determined whether or not it has been performed [step S14]. If it is confirmed that the nose-view mode is not set in this determination process, the process returns to the main control routine, and the navigation image N in the main control routine is returned.
Is displayed continuously.

However, if it is confirmed in step S14 that the transmission is in the nose-view mode, it is confirmed that the nose-view mode has already been set before the transmission temporarily passes through the reverse range. Then, in order to continue the display of the nose-view image F at that time, the process proceeds to step S7, and the nose-view camera 2
Activate By this processing, the nose-view camera 2 once stopped in step S9 is turned on (activated) again, and the nose-view image F is continuously displayed. Then, after setting the control flag f to [1] again [Step S8], the process returns to the main control routine.

As described above, the display image on the display 8a is changed to the nose-view image instead of the navigation image N in accordance with the range position state of the transmission and the nose-view mode setting input through the operation unit 15. According to the present apparatus for selectively switching to F or rear-view image B, as shown schematically in FIG. 5, depending on the range position of the transmission and the state of switching, the nose-view mode Is selectively set and the output control of the voice message is performed depending on whether or not is set.

That is, when the nose-view mode is not set and the range of the transmission is set to a range other than the reverse range (R range), the processing in the control routine shown in FIG. Steps S1 to S2
Since the process proceeds to S3 and S4, the nose-view camera 2 and the rear-view camera 3 are each turned off, and the navigation image N obtained by the navigation system 6 is constantly displayed as shown in FIG.

On the other hand, if the nose-view mode is set in a state where the range of the transmission is set to a range other than the reverse range (R range), the processing in the control routine shown in FIG. From S2, S
3 and S5, and at the first point in time when the mode setting operation is performed, the process further proceeds to steps S6, S7 and S8, so that a voice message indicating that the nose view display is to be performed as shown in FIG. Is displayed along with. After a predetermined period, if the range of the transmission has not been switched at the time when the control routine shown in FIG. 4 is started again, the control flag f is set to [1] in step S8 in the previous processing routine. Since the setting has been made, the output processing of the voice message in step S6 is skipped (omitted), and the display output of the nose-view image F is continuously executed as it is.

On the other hand, when the range of the transmission is set to the reverse range (R range), the process proceeds from step S1 to S9 and S10 of the control routine shown in FIG. The state is determined. Since the setting of the reverse range is detected in step S10, regardless of whether the nose-view mode has been set by the processing in steps S11, S12, and S13, FIG.
As shown in (c), the output of the voice message indicating that the rear view display is performed and the display output of the rear view image B are performed.

When the display output of the navigation image N or the nose-view image B is being performed as shown in FIGS. 5A and 5B, the transmission shown in FIGS. Is switched to the backward range, the processing procedure shown in FIG. 4 proceeds from step S1 to steps S9, S10,..., S13 at that point, whereby the display image on the display 8a is changed to the rear view image B. The voice message is output.

Conversely, when the range of the transmission is switched from the reverse range to another range while the rear view image B is being displayed and output as shown in FIG.
If the mode is not set, step S1
Then, the process proceeds to steps S2, S3, and S4, and the display is returned to the display output of the navigation image N as shown in FIG. However, if the nose-view mode has already been set, the processing from step S3 described above proceeds to steps S5 and S6.
As shown in (g), display output of the nose-view image F and output of a voice message to that effect are performed.

By the way, the nose-view mode is set in a state where the range of the transmission is set to the parking range, a nose-view image F is displayed as shown in FIG. When the range of the transmission is shifted to a drive range or the like in the output state (when the range is switched), the range of the transmission temporarily passes through the R range. Therefore, in this case, the processing procedure shown in FIG. 4 proceeds from step S1 to S9 and S10. However, at this time, since the range fixing release button has been operated, the process proceeds to step S14, and the display output of the rear view image B is not performed. In this case, since the nose-view mode has already been set, the process proceeds to step S7 and the display output of the nose-view image F is continuously performed. That is, in this case, the display output of the nose-view image F is continuously performed without outputting the voice message.

If the range of the transmission passes through the reverse range in a state where the nose-view mode is not set, the procedure returns to the main control routine through step S14. It is not changed from the image N. Also, as shown in FIGS. 5 (i) and 5 (j), when the nose-view image F is displayed in a range other than the parking range or the reverse range, the range of the transmission is set to a value other than the parking range or the reverse range. If the range is switched to the range shown in FIG. 4, the processing procedure shown in FIG.
Since the process proceeds from S3 to S5, S7 and S8, the display output of the nose-view image F is continuously performed without outputting the voice message.

Thus, according to the present apparatus, as described above, the navigation image N, the nose-view image F, and the rear-view image B are selectively displayed on the display 8a, and the output of the voice message accompanying the switching of the display image is controlled. Although the rear view image B is preferentially displayed and output when the range of the transmission is set to the reverse range, the range is switched to the reverse range, for example, when the transmission is shifted from the parking range to the drive range. , The display is not switched to the rear view image B. In addition, when the range of the transmission is set to the drive range after passing through the reverse range, and the display output of the nose-view image F is continuously performed accordingly, the voice message is not output according to the control flag f. Has become.

In other words, when the range of the transmission is set to the reverse range and the rear view image B is displayed and output, a voice message to that effect is output accordingly.
On the other hand, when the nose-view mode is set in a state where the range of the transmission is set to a range other than the reverse range, the nose-view image F is displayed instead of the navigation image N, and the nose-view image F is displayed. A voice message to that effect is output. Also, when the nose-view image F is displayed instead of the rear-view image B with the range change of the transmission, a voice message to that effect is output. However, when the nose-view image F is continuously displayed regardless of the range of the transmission, the voice message is not re-output as described above.

Therefore, according to the above-described control, a nose-view instruction is given by the operation of the operation unit 15 by the user (driver), and when the display is switched to the nose-view image F according to the intention, or when the transmission is changed. When the forward / backward movement of the vehicle is intentionally changed by switching the range, an audio message to that effect is output only when the display image is switched to the rear view image B or the nose view image F in conjunction with this. Therefore, when the range of the transmission is simply switched from the parking range to the drive range, the voice message indicating the nose view display is not repeatedly output with the switching of the range, and the nose view mode is set. There is no discomfort to the operation. That is, output of a voice message that does not match the user's operation intention can be simply and effectively eliminated. Then, only when the display is switched to the nose-view image F and the rear-view image B, it is possible to provide an effect that a voice message indicating the fact can be output accurately.

The present invention is not limited to the embodiment described above. For example, although the processing procedure shown in FIG. 4 mainly shows output control of a voice message when the nose-view image F is displayed, output of a voice message when the rear-view image B is displayed can be similarly controlled. is there. That is, the output of the voice message relating to the rear view image B is managed using a control flag different from the control flag f described above, and only when the display switching to the rear view image B is executed, the voice message to that effect is transmitted. What is necessary is just to output.

Also, instead of determining the state of the range fixing release button, it is determined whether or not the transmission is kept in the same range for a predetermined period of time. It is also possible to determine whether it is in a locked state or whether it has been set to switch to that range. Further, instead of prohibiting the output of the voice message itself when the vehicle passes through the reverse range, the voice message can be checked if necessary by lowering the output level, for example. . In addition, the present invention can be variously modified and implemented without departing from the gist thereof.

[0039]

As described above, according to the present invention, when the range of the transmission of the vehicle is switched in the image display mode for the left and right views ahead of the vehicle, the switching passes through the reverse range. It is provided with means for judging whether the voice message is present and restricting re-output of the voice message when passing through the reverse range.

Therefore, even if the range of the transmission is simply switched through the reverse range while the front left and right view images are being displayed, a voice message indicating that the front left and right view images are displayed is output again with the range change. Since no voice message is output, an unpleasant sensation due to repetitive voice message output does not occur. According to the second aspect of the present invention, since the operating state of the fixing release button with respect to the shift position is detected together with the shift position of the transmission, it is determined whether or not the switching simply passes through the shift position. The determination can be made simply and reliably.

According to the third aspect of the present invention, when the range change of the transmission passes through the reverse range, the image display of the rear view of the vehicle is prohibited, and the image display mode before the range change is set. Since the display is continued, undesired switching of the display image can be simplified and effectively prevented, and the output of the undesired voice message can be prevented beforehand.

According to a fourth aspect of the present invention, when the transmission of the vehicle is set to the reverse range and the image display of the left and right views ahead of the vehicle is instructed, the range of the transmission is set to the reverse range. Since the switch from the reverse range is detected and the left and right view images in front of the vehicle are displayed on the display means, it is possible to reliably output a voice message about the display image at the time of switching the display image. The effect can be achieved.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a view camera incorporated in a vehicle and its functions.

FIG. 2 is a diagram showing a display example of a nose view image F.

FIG. 3 is a diagram showing a schematic configuration of a view device according to an embodiment of the present invention.

FIG. 4 is an exemplary view showing a processing procedure of display image switching control and voice message output control in the apparatus of the embodiment.

FIG. 5 is a diagram schematically showing a change mode of a display image according to range switching of the transmission.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle 2 Nose view camera 3 Rear view camera 5 View system 5a Image control unit 6 Navigation system 6a Own vehicle position detection means 6b Vehicle direction detection means 7 Control unit 8 Information presentation unit 11 GPS receiver 12 Gyro 13 CD-ROM (Map data) 15 Operation unit 16 Vehicle sensor 17 Video switching unit 18 Audio circuit 19 Speaker

Continued on the front page. (72) Inventor Takahiro Maemura 5-33-8 Shiba, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation (72) Inventor Norio Inoue 5-33-8 Shiba 5-chome, Minato-ku, Tokyo Mitsubishi (72) Inventor Tadashi Sugawara 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (56) References JP-A-7-223488 (JP, A) JP-A-4 JP-243639 (JP, A) JP-A-1-189289 (JP, A) JP-A-61-98470 (JP, A) JP-A-8-167100 (JP, A) JP-A-5-34049 (JP, U) ) Japanese Utility Model 1-69948 (JP, U) Japanese Utility Model 58-139243 (JP, U) Japanese Utility Model 56-42443 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60R 1/00

Claims (4)

(57) [Claims] 1. A first image pickup means for picking up left and right views ahead of a vehicle, a second image pickup means for picking up a rear view of the vehicle, and an image obtained by these image pickup means can be selectively displayed. In a vehicle view device provided with display means, when an image display of a left and right view in front of the vehicle is instructed,
Means for displaying an image of the left and right field of vision in front of the vehicle on the display means, means for outputting a voice message to that effect when the left and right field of vision image in front of the vehicle is displayed, and wherein the transmission of the vehicle is set to a reverse range. Means for preferentially displaying an image of the rear view of the vehicle on the display means,
When the range of the transmission of the vehicle is switched in the image display mode of the left and right view in front of the vehicle, it is determined whether or not the switching is performed through the reverse range. And a means for limiting output. 2. A method of determining whether switching of the range of the transmission of the vehicle is performed through a reverse range includes detecting a shift position of the transmission and operating a fixing release button with respect to the shift position. The vehicle view device according to claim 1, wherein the detection is performed by detecting a state. 3. When the range change of the transmission of the vehicle passes through a reverse range, image display of the rear view of the vehicle is prohibited, and the mode of image display before range change is continued. The view device for a vehicle according to claim 1. 4. When the transmission of the vehicle is set to a reverse range and an image display of a left and right view ahead of the vehicle is instructed, switching of the range of the transmission from the reverse range is detected. The vehicle view device according to claim 1, wherein an image of a left and right view ahead of the vehicle is displayed on the display unit.