JP2017005352A - On-vehicle display device and vehicle rear-side video image display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a "on-vehicle display device" in which the presence of a following vehicle at a dead angle position that is not displayed in a rear-side capturing video image of a present vehicle, is made visible by predetermined display.SOLUTION: An on-vehicle display device comprises: a rear-side video image display part for displaying a rear-side video image that is captured by an on-vehicle camera for imaging a rear side outside of the present vehicle; rear-side video image display control means for displaying the rear-side video image on he rear-side video image display part; and approach indication superposed display means by which a predetermined approach indication is displayed while being superposed for a following vehicle at a predetermined speed or higher that is displayed in the rear-side video image and approaches the present vehicle within a predetermined distance. The on-vehicle display device also comprises: non-displayed following vehicle detection means for detecting a non-displayed following vehicle that is not displayed in the rear-side video image and travels in a predetermined rear-side area of the present vehicle; and vehicle presence indication superposed display means for displaying a vehicle presence indication showing the presence of the non-displayed following vehicle that is detected by the non-displayed following vehicle detection means, while superposing it on the rear-side video image.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an in-vehicle display device and a vehicle rear image display method for displaying a rear image by an in-vehicle camera that captures the rear side of the vehicle.

  A rearview mirror (or “room mirror”) provided inside the vehicle is an automotive part that allows the driver to visually recognize the exterior rear of the vehicle. Generally, an optical mirror that is a plane mirror (or a convex mirror) and this optical mirror are installed inside the vehicle. It is formed with the fixture to fix. In recent years, electronic mirrors have been proposed in which captured images of the rear of a vehicle by an in-vehicle camera are displayed on a display instead of a rearview mirror using a plane mirror or the like. Electronic mirrors are expected to eliminate blind spots and nighttime identification difficulties of conventional optical mirrors (camera effect), and can be displayed in a variety of ways using a display. A blind spot vehicle warning can be realized (see, for example, Patent Document 1). In the rear side imaging device of the vehicle described in Patent Document 1, a warning is given to the degree of danger caused by a vehicle approaching rearward by expressing a marker (such as a frame line) on the approaching vehicle based on a distance and speed difference from the approaching vehicle. Can do.

JP 2013-207747 A

  Hereinafter, an image displayed on a conventional electronic mirror will be described with reference to FIGS. As shown in FIG. 5, the display unit 100 having a display screen as a rearview mirror (electronic mirror) for displaying a rear shot image by an in-vehicle camera (not shown) installed in the rear part of the host vehicle is behind the road 101a. A rear image 103a showing the traveling vehicle 102a is displayed. A frame line display 105a as a warning display for the driver when approaching the host vehicle (not shown) at a distance and speed within a predetermined range is superimposed on the backward traveling vehicle 102a. In addition, left and right indicators 107a and 107b that display icons for indicating the presence of a backward traveling vehicle that travels in the position of the rear blind spot, as will be described later, are provided on the left and right of the display unit 100, respectively.

  When the backward traveling vehicle 102a further approaches the host vehicle, a thick frame line display 105b with a thicker line than the frame line display 105a is superimposed and displayed around the vehicle body as a warning display in the rear image 103b. Thereafter, when the rear traveling vehicle 102a reaches the blind spot position on the right rear side of the host vehicle, it is not displayed in the rear image 103c. Therefore, the vehicle icon 111 and the rear image are displayed on the right indicator 107b as an indication that the vehicle is present at the blind spot position. A bar graph 112 that expands and contracts the distance between vehicles is displayed on 103b.

  In the rear image 103d shown in FIG. 6, when two rear traveling vehicles 102b and 102c traveling on the road 101b approach the own vehicle, the rear traveling vehicle 102b closer to the own vehicle approaches at a predetermined range of distance and speed. In addition, a frame display 105a as a caution display is superimposed on the rear traveling vehicle 102b. Further, as shown in the rear image 103e, when the backward traveling vehicles 102b and 103c approach the own vehicle, a warning display 105b is superimposed on the backward traveling vehicle 102b, and a caution display 105a is superimposed on the backward traveling vehicle 102c. Thereafter, as shown in the rear image 103f, when the rear traveling vehicle 102b comes closer and enters the blind spot position on the right rear side of the host vehicle, the vehicle icon 111 is displayed on the right indicator 107b and the distance between the vehicles is expanded on the rear image 103f. A bar graph 112 is displayed. A warning display 105 is superimposed on the approaching rear vehicle 102c.

  As shown in FIGS. 5 and 6, the conventional rearview mirror (electronic mirror) has a warning or the like that displays an icon on the indicator when the approaching vehicle enters the blind spot position behind the host vehicle and is not displayed on the rearview mirror. However, there is a problem that an indicator installation space must be secured on the left and right sides of the rearview mirror, and the icon shown on the indicator cannot be sufficiently visually recognized. In particular, when a caution display or a warning display is displayed on the rear image together with the icon display, the visibility of the icon display shown on the indicator is weak, and the blind spot vehicle lacks recognition. Furthermore, although it is conceivable to add a display unit for additionally displaying a side rear image for displaying the rear side of the host vehicle, the installation space is wide and the usability is poor. Further, when the additional display is performed on the rearview mirror, the rear video and the side rear video are mixed, resulting in poor visibility.

  The present invention has been made in view of such circumstances, and provides an in-vehicle display device that can visually recognize the presence of a rear vehicle at a blind spot position that is not displayed in a rear shot image of the host vehicle by a predetermined display.

  In order to solve the above problems, an in-vehicle display device according to the present invention includes a rear video display unit that displays a rear video outside the vehicle, and a rear video display control unit that displays the rear video on the rear video display unit. An in-vehicle display device comprising: an approach display superimposing display means that superimposes a predetermined approach display on a succeeding vehicle at a predetermined speed or higher that is displayed in the rear image and approaches the host vehicle within a predetermined distance. A non-displayed succeeding vehicle detection means for detecting a non-displaying succeeding vehicle that travels in a predetermined rear region of the host vehicle, which is not displayed in the rear image, and the non-displaying succeeding vehicle detected by the non-displaying succeeding vehicle detection means. Vehicle presence display superimposed display means for superimposing and displaying a vehicle presence display indicating the presence on the rear image.

  According to such a configuration, when a non-displayed succeeding vehicle traveling in a predetermined rear region that is not displayed in the back image on the screen of the back image display unit is detected, a vehicle presence display indicating the presence of the non-displayed succeeding vehicle is detected. Is superimposed on the rear image, so that the driver can visually recognize the presence of the non-displaying succeeding vehicle without requiring display with an indicator or the like. The predetermined rear area includes a side rear blind spot area of the host vehicle.

  In the vehicle-mounted display device according to the present invention, the vehicle presence display superimposing display unit is configured to superimpose and display at least one of the trajectories of the front and rear wheels of the non-displaying succeeding vehicle as the vehicle presence display. be able to.

  According to such a configuration, when a non-displaying succeeding vehicle is detected, at least one of the trajectories of the front wheels and the rear wheels is displayed in the rear image, so that the presence and position of the non-displaying succeeding vehicle are displayed in the rear image. Can be confirmed. That is, by displaying a trajectory that is a trace through which a wheel has passed, it is possible to determine in which of the blind spots behind the left and right sides of the host vehicle.

  In the vehicle-mounted display device according to the present invention, the vehicle presence display superimposing display means further has a configuration in which a part of an afterimage of the non-displaying succeeding vehicle is superimposed and displayed on the locus of the front wheel or the rear wheel as the vehicle presence display. Can do.

  According to such a configuration, in addition to the trajectory of at least one of the front wheels and rear wheels of the non-display subsequent vehicle, a part of the afterimage of the non-display subsequent vehicle is superimposed and displayed on the rear image. And confirmation of the position is more reliable. The part of the afterimage of the non-displaying succeeding vehicle includes an afterimage of the taillight of the vehicle in addition to the afterimage of a part of the vehicle body.

  In the in-vehicle display device according to the present invention, the non-display subsequent vehicle detecting means may detect the non-display subsequent vehicle based on a video image taken by another in-vehicle camera different from the in-vehicle camera.

  According to such a configuration, it is possible to detect a non-displayed succeeding vehicle by analyzing a captured image by another in-vehicle camera that captures the non-displaying succeeding vehicle at the blind spot position of the in-vehicle camera that provides the rear image. it can. It should be noted that instead of analyzing the captured video by another in-vehicle camera, the non-display subsequent vehicle may be directly detected by an infrared sensor or an ultrasonic sensor.

  In the in-vehicle display device according to the present invention, the approach display superimposed display means may change the approach display according to a predetermined stepwise approach distance of the succeeding vehicle.

  According to such a configuration, the following vehicle information necessary for the driver can be obtained by changing the proximity display of the following vehicle in accordance with a predetermined stepwise approach distance, such as a caution display or a warning display. Can do. Since it is possible to grasp the existence of the following vehicle of such approach display, it is possible to predict a non-displayed subsequent vehicle that travels in the blind spot position thereafter.

  Furthermore, in order to solve the above-mentioned problem, a vehicle rear image display method according to the present invention includes a rear image display step for displaying a rear image outside the vehicle of the host vehicle, and the rear image is displayed within the predetermined distance from the host vehicle. An approach display superimposed display step for superimposing and displaying a predetermined approach display for a subsequent vehicle approaching a predetermined speed and approaching the vehicle, wherein the vehicle's rear image display method is not displayed in the rear image. A non-display subsequent vehicle detecting step for detecting a non-display subsequent vehicle traveling in a rear region, and a vehicle presence display superimposing display step for displaying a vehicle presence display indicating the presence of the detected non-display subsequent vehicle superimposed on the rear image; It becomes the composition which has.

  In the vehicle rear image display method according to the present invention, the vehicle presence display superposition display step is configured to superimpose and display at least one of the trajectories of the front wheels and rear wheels of the non-display subsequent vehicle as the vehicle presence display. It can be.

  In the vehicle rear image display method according to the present invention, the vehicle presence display superimposed display step further includes a configuration in which a part of an afterimage of the non-displayed succeeding vehicle is superimposed and displayed on the locus of the front wheel or the rear wheel as the vehicle presence display. can do.

  In the vehicle rear image display method according to the present invention, the non-display subsequent vehicle detection step may be configured to detect the non-display subsequent vehicle based on a video image taken by another in-vehicle camera different from the in-vehicle camera. .

  In the vehicle rear image display method according to the present invention, the approach display superimposed display step may change the approach display according to a predetermined stepwise approach distance of the succeeding vehicle.

  According to the present invention, when a non-displayed succeeding vehicle traveling in a predetermined rear region that is not displayed in the rear image on the screen of the rear image display unit is detected, the vehicle presence display indicating the presence of the non-displayed succeeding vehicle is displayed backward. Since it is superimposed on the video, the presence of the non-displaying succeeding vehicle can be easily recognized by the driver on the rear video without requiring a separate indicator or the like.

FIG. 1 is a block diagram showing the configuration of an in-vehicle device including an in-vehicle display device according to an embodiment of the present invention. FIG. 2 is a flowchart showing a processing procedure by the processing unit of the in-vehicle display device shown in FIG. FIG. 3 is a schematic diagram (part 1) illustrating a vehicle rear image displayed on the rear image display unit in the present embodiment. FIG. 4 is a schematic diagram (part 2) illustrating the vehicle rear image displayed on the rear image display unit in the present embodiment. FIG. 5 is a schematic diagram (part 1) illustrating a vehicle rear image displayed on a conventional rear image display unit. FIG. 6 is a schematic diagram (part 2) illustrating a vehicle rear image displayed on a conventional rear image display unit.

  Embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the vehicle-mounted display apparatus 10 which concerns on embodiment of this invention is comprised as a part of vehicle-mounted apparatus 11 to which the back image display part was connected.

  In FIG. 1, the in-vehicle device 11 includes a processing unit 12 configured by a computer unit (for example, CPU, RAM, ROM, I / O interface, bus, and the like). Connected to the processing unit 12 are an AV unit 15 capable of reproducing various sound sources and video sources (eg, CD and DVD) and a navigation unit 16 capable of navigating the host vehicle. A speaker 18 is connected to the processing unit 12 via an output circuit 17. As a result, audio signals related to processing by the AV unit 15 and the navigation unit 16 can be output as audio from the speaker 18 via the output circuit 17. Further, as will be described later, a warning sound can be generated at the time of vehicle presence display indicating the presence of a non-displaying succeeding vehicle. In addition, the processing unit 12 includes a storage unit 20 (for example, a hard disk, a flash memory, etc.) capable of storing various information such as music information and map information used in the AV unit 15 and the navigation unit 16, and an LCD. A display unit 21 that displays video and the like associated with various processes to be performed and an operation unit 22 that can input instructions necessary for various processes formed on the display unit 21 in a touch panel format are connected. The operation unit 22 can include a hard key using a physical key in addition to the soft key using the touch panel format.

  The processing unit 12 is connected to an in-vehicle camera 25 (25a, 25b, 25c, 25d) for photographing the outside of the host vehicle via a cable or the like. The in-vehicle camera 25a captures a predetermined range of the rear of the host vehicle, the in-vehicle camera 25b on the right side of the host vehicle, the in-vehicle camera 25c on the left side of the host vehicle, and the in-vehicle camera 25d in front of the host vehicle. A video image taken by the in-vehicle camera 25 (25a to 25d) is displayed on the display unit 21 for, for example, confirmation of surroundings in reverse parking or the like of the host vehicle. Further, the processing unit 12 is connected with a rear image display unit 27 for displaying a rear image of the host vehicle photographed by the in-vehicle camera 25a. The rear video display unit 27 includes a display screen constituted by an LCD or the like, and equipment for providing the display screen at a predetermined position in the host vehicle (for example, the upper part of the driver's seat). It is an alternative to a rearview mirror made up of an optical mirror. In the present embodiment, the in-vehicle display device 10 is configured by the processing unit 12, the storage unit 20, and the rear video display unit 27.

  In the in-vehicle display device 10, the processing unit 12 performs processing in the procedure as shown in FIG. Hereinafter, the operation of the in-vehicle display device 10 will be described with reference to FIG. 2 showing the processing procedure and FIGS. 3 and 4 which are schematic diagrams showing an outline of the vehicle rear image displayed on the rear image display unit 27.

  In FIG. 2, the processing unit 12 displays a rear image by the in-vehicle camera 25 a that captures the rear outside of the host vehicle on the screen of the rear image display unit 27 by the ACC switch ON or the engine operation (rear image display control means). Based on the analysis of the rear image, the processing unit 12 approaches the rear of the host vehicle, which approaches the rear of the host vehicle at a speed of, for example, a speed difference of 15 (km / hr) or more and travels within 150 m from the host vehicle. The presence or absence is detected (S11). The processing unit 12 executes a predetermined image analysis program stored in the storage unit 20 to detect the presence or absence of a following vehicle that meets the above conditions.

  When the processing unit 12 detects a succeeding vehicle that approaches the rear of the host vehicle at a speed difference of 15 (km / hr) or more than the speed of the host vehicle and travels within 150 m from the host vehicle (YES in S11). The predetermined caution display 35 (35a, 35b) is superimposed and displayed as a first display on the succeeding vehicle 33a on the rear image 31a displayed on the rear image display unit 27 shown in FIG. 3 (S12: approach display superimposed display means) ). The caution display 35 superimposes and displays a circular display with a predetermined luminance on the left and right of the front portion of the following vehicle 33a. As such superimposed display, for example, an application that realizes a function called AR (Augmented Reality) can be executed to superimpose the caution display as additional information on the rear video. Accordingly, the driver or the like can approach the host vehicle at a predetermined speed difference (15 km / hour) or more and visually recognize the presence of the following vehicle within 150 m on the rear image display unit 27.

  When the following vehicle 33a that is the target of the first display is not detected (NO in S11) or after the caution display 35 (S12) that is the first display is performed, the processing unit 12 further increases the speed difference (15 km). / Hour) The presence or absence of a following vehicle that approaches and is within 80 m away from the host vehicle is detected (S13). In addition to the case where the following vehicle 33a on the rear image 31a approaches further, the following vehicle that is not covered by the first display and whose speed difference (15 km / hour) or less suddenly increases the speed, and the speed difference 15 km / This also takes into account the case where the distance is within 80 m at the time.

  When the processing unit 12 detects a subsequent vehicle that approaches the rear of the host vehicle at a speed difference of 15 (km / hr) or more from the speed of the host vehicle and travels within 80 m from the host vehicle (YES in S13). The predetermined warning display 36 (35a, 35b) is superimposed and displayed as the second display on the subsequent vehicle 33b on the rear image 31b displayed on the rear image display unit 27 shown in FIG. 3 (S14: approach display superimposed display means) ). The warning display 36 superimposes and displays a circular display with a predetermined luminance on the left and right of the front portion of the following vehicle 33a. The warning display 36 is a circular display with a larger size and higher luminance than the above-described warning display 35 as the first display. (Additional display of additional information by the AR function or the like). Accordingly, the driver or the like can approach the own vehicle at a predetermined speed difference (15 km / hour) or more and visually recognize the presence of the following vehicle requiring attention within 80 m from the rear image display unit 27.

  When the succeeding vehicle 33b that is the second display target is not detected (NO in S13), or after the warning display 36 (S14: approach display superimposed display means) that is the second display is performed, the processing unit 12 The presence / absence of a non-displaying succeeding vehicle at a so-called blind spot position on the rear side of the host vehicle that is not displayed in the rear image of the rear image display unit 27 is detected (S15: non-displaying succeeding vehicle detection means). In addition to the case where the succeeding vehicle 33b on the rear image 31b approaches and moves to the blind spot position, the succeeding vehicle having the speed difference (15 km / hour) or less that is not the target of the second display is the dead spot position. This is also taken into account when moving to.

  The processing unit 12 executes a predetermined image analysis program stored in the storage unit 20 for the presence / absence of a non-displaying succeeding vehicle at the blind spot position on the rear side of the host vehicle, and the left and right side photographing by the in-vehicle cameras 25b and 25c. By analyzing the video, it is possible to detect the presence or absence of a non-displaying succeeding vehicle at the blind spot position (non-displaying succeeding vehicle detection means). Further, instead of analyzing the captured image of the in-vehicle camera, it is also possible to directly detect the non-displaying succeeding vehicle at the blind spot position by an infrared sensor or an ultrasonic sensor.

  As shown in the rear image 31c of FIG. 3, when the processing unit 12 detects a non-displaying succeeding vehicle at the blind spot position on the rear side of the host vehicle (YES in S15), the processing unit 12 displays the following vehicle as the third display. The vehicle locus 38a and the taillight afterimage 39a are superimposed and displayed as additional information by the above-described AR function (S16: vehicle presence display superimposed display means). In the rear image 31c of FIG. 3, the following vehicle 33b in the rear image 31b described above has moved to the blind spot position on the rear side of the right side of the host vehicle due to the course change. 38a and the taillight afterimage 39a are superimposed and displayed. Thus, even if the non-displaying succeeding vehicle itself at the blind spot position cannot be displayed in the rear image 31c, the driver can display the rear image display unit 27 as an electronic mirror by superimposing the vehicle locus 38a and the taillight afterimage 39a. Thus, the presence of the non-displaying succeeding vehicle at the blind spot position of the host vehicle can be sufficiently visually confirmed. Note that the vehicle trajectory 38a and the taillight afterimage 39a are preferably displayed in a conspicuous color such as red with a luminance of a predetermined height or more in order to alert the driver or the like sufficiently. The vehicle trajectory 38a has a preset thickness, length, and the like. Further, instead of the taillight afterimage 39a, an afterimage of a part of the non-display vehicle (such as the rear portion) may be displayed.

  When the non-display succeeding vehicle that is the target of the third display is not detected (NO in S15), or after the vehicle trajectory 38a that is the third display and the afterimage 39a of the taillight are superimposed, the processing unit 12 When the engine stop or ACC switch OFF is detected, the display of the rear video on the rear video display unit 27 is terminated (YES in S17), and the display of the rear video is continued in other cases (NO in S17). ) In order to repeatedly perform the first display to the third display, the detection of the succeeding vehicle is repeatedly performed every predetermined time, and the first display to the third display are updated and displayed by the detection.

  In addition, as shown in FIG. 4, the case where two subsequent vehicles approach the host vehicle will be described. In the rear image 31d of FIG. 4, the processing unit 12 detects that, of the following vehicles 33b and 33c, the following vehicle 33b has a speed difference of 15 km / h or more from the own vehicle and approaches within a distance of 150 m. Therefore, the caution display 35 (35a, 35b) which is the first display is superimposed and displayed on the following vehicle 33c (superimposed display by the AR function or the like). Next, in the rear image 31e, the processing unit 12 detects that the following vehicle 33c is approaching within a distance of 80m at a speed difference of 15 (km / h) or more with the own vehicle, so Warning display 36 (36a, 36b), which is two display, is displayed in a superimposed manner (superimposed display by the AR function, etc.), and the speed difference between the following vehicle 33d and the own vehicle is 15 (km / hour) or more, and the distance is 150 m. Since the approach was detected within, the caution display 35 (35a, 35b) as the first display was superimposed on the subsequent vehicle 33d. In the caution display 35 and the warning display 36, the warning display 36 is larger in display size and brightness, so that even if both displays coexist, the driver can easily recognize the difference sufficiently. Can do.

  Next, in the rear image 31f of FIG. 4, the following vehicle 33c further approaches the host vehicle, enters the blind spot position on the right rear side of the host vehicle, and is out of the display range. The vehicle trajectory 38b and the taillight afterimage 39b of the non-labeling succeeding vehicle 33c as the three display are superimposed and displayed as additional information by the above-described AR function. Further, since the processing unit 12 detects that the following vehicle 33d has a speed difference of 15 (km / hour) or more from the own vehicle and approaches within a distance of 80 m, a warning display as a second display is displayed on the following vehicle 33c. 36 (36a, 36b) are displayed in a superimposed manner (superimposed display by the AR function, etc.). In this case, the vehicle trajectory 38 and taillight afterimage 39, which are the third display, and the warning display 36, which is the second display, are simultaneously displayed in the rear image 31f, but the vehicle trajectory 38 is a diagram of a predetermined thickness. Since the taillight afterimage 39 is also displayed, it is shown more clearly than the icon display in the conventional indicator, so that even if it coexists with the warning display 36, it can be fully recognized.

  As described above, according to the in-vehicle display device according to the embodiment of the present invention, even when the approaching succeeding vehicle reaches the blind spot position of the host vehicle and is not displayed in the rear image on the rear image display unit, Since the vehicle presence display such as the trajectory is displayed in the rear image, the non-displaying succeeding vehicle can be easily visually recognized in the rear image of the in-vehicle display device. In the present embodiment, the in-vehicle display device 10 is configured as a part of the in-vehicle device 11 to which the rear video display unit 27 is connected, but without using the in-vehicle device 11, a processing unit, a storage unit, It can also be realized by a combination of the rear video display unit. Further, in the embodiment, the vehicle presence display is a trail of the following vehicle and an afterimage of the taillight. However, the present invention is not limited to this, and either one may be used. An afterimage of the vehicle body (entire or part) may be displayed. Furthermore, as described above, the approach display (attention display, warning display) is determined step by step based on the speed difference and the approach distance, but is not limited to this. For example, the approach display is determined step by step based on the approach distance. Also good. Further, the speed difference (15 km / hour) and the approach distance (150 m, 80 m) are numerical values set for easy explanation, and are not limited thereto.

  As described above, the in-vehicle display device according to the present invention displays the vehicle presence display in the rear image when the non-displaying succeeding vehicle traveling in the predetermined rear region that is not displayed in the rear image of the rear image display unit is detected. Since it is displayed in a superimposed manner, it has the effect of allowing the driver to visually recognize the presence of a non-displaying succeeding vehicle on the rear image, and is useful as an in-vehicle display device that displays a rear image from an in-vehicle camera that captures the outside of the vehicle. It is.

DESCRIPTION OF SYMBOLS 10 In-vehicle display apparatus 11 In-vehicle apparatus 12 Processing unit 15 AV unit 16 Navigation unit 17 Output circuit 18 Speaker 20 Memory | storage part 21 Display part 22 Operation part 25 (25a, 25b, 25c, 25d) In-vehicle camera 27 Back image display part 31 (31a) 31b, 31c, 31d, 31e, 31f) Rear image 33 (33a, 33b, 33c, 33d) Subsequent vehicle 35 (35a, 35b) Caution display (first display)
36 (36a, 36b) Warning display (second display)
38 (38a, 38b) Vehicle trajectory (third display)
39 (39a, 39b) Taillight afterimage (third display)

Claims (10)

A rear video display unit that displays a rear video outside the vehicle of the host vehicle, a rear video display control unit that displays the rear video on the rear video display unit, and displayed in the rear video and within a predetermined distance from the host vehicle An in-vehicle display device having approach display superimposed display means for superimposing and displaying a predetermined approach display for a following vehicle approaching at a predetermined speed or higher,
A non-display subsequent vehicle detecting means for detecting a non-display subsequent vehicle traveling in a predetermined rear region of the host vehicle, which is not displayed in the rear image;
An on-vehicle display device comprising vehicle presence display superimposed display means for superimposing and displaying a vehicle presence display indicating the presence of the non-display subsequent vehicle detected by the non-display subsequent vehicle detection means on the rear image.   The on-vehicle display device according to claim 1, wherein the vehicle presence display superimposing display unit superimposes and displays at least one of the trajectories of front wheels and rear wheels of the non-displaying succeeding vehicle as the vehicle presence display on the rear image.   The in-vehicle display device according to claim 2, wherein the vehicle presence display superimposing display unit further superimposes and displays a part of the afterimage of the non-displaying succeeding vehicle on the locus of the front wheel or the rear wheel as the vehicle presence display.   4. The in-vehicle display device according to claim 1, wherein the non-display subsequent vehicle detection unit detects the non-display subsequent vehicle based on a video image taken by another in-vehicle camera different from the in-vehicle camera.   The in-vehicle display device according to any one of claims 1 to 4, wherein the approach display superimposed display means changes the approach display according to a predetermined stepwise approach distance of the succeeding vehicle. A rear image display step for displaying a rear image outside the vehicle of the host vehicle, and a predetermined approach display superimposed on a subsequent vehicle that is displayed in the rear image and approaches a predetermined distance or higher approaching the host vehicle. A vehicle rear image display method comprising: an approach display superimposed display step;
A non-display subsequent vehicle detection step for detecting a non-display subsequent vehicle traveling in a predetermined rear region of the host vehicle, which is not displayed in the rear image;
A vehicle rear image display method comprising: a vehicle presence display superimposed display step of superimposing a vehicle presence display indicating the presence of the detected non-displayed succeeding vehicle on the rear image.   The vehicle rear image display method according to claim 6, wherein the vehicle presence display superimposed display step displays a trajectory of a front wheel or a rear wheel of the non-display subsequent vehicle as the vehicle presence display in a superimposed manner on the rear image.   8. The vehicle rear image display method according to claim 7, wherein the vehicle presence display superimposed display step further displays a part of an afterimage of the non-displayed succeeding vehicle on the locus of the front wheel or the rear wheel as the vehicle presence display.   9. The vehicle rear image display method according to claim 6, wherein the non-display subsequent vehicle detection step detects the non-display subsequent vehicle based on a video image taken by another vehicle camera different from the vehicle camera.   The vehicle rear image display method according to claim 6, wherein the approach display superimposed display step changes the approach display according to a predetermined stepwise approach distance of the succeeding vehicle.

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