JP2013024709A - Navigation device and navigation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide information for a user to easily determine a direction of a traveling road which the user has already traveled in the past when the user travels the road in the opposite direction.SOLUTION: A navigation device stores a rear image in which the rear of a traveling direction of a vehicle is imaged in association with vehicle location information acquired when the rear image is taken, as presentation data in a storage part. Then, on the basis of the stored presentation data, according to timing when the vehicle reaches the vehicle position of the presentation data, the navigation device presents the rear image in the presentation data corresponding to the vehicle location to an occupant of the vehicle.

Description

  The present invention relates to a navigation technique that provides guidance for traveling of a vehicle.

  The invention described in Patent Document 1 includes map information related to narrow streets in advance. And invention of patent document 1 displays the map information regarding a narrow street, when the number etc. of the road which a navigation apparatus displays becomes less than the preset number. As a result, it is described that in areas with few roads, narrow streets can be displayed as much as possible to check the position of the vehicle.

JP 2005-181251 A

  When heading to a destination through a narrow street that the driver does not know, the passenger may guide the destination to the destination. In such a case, when the passenger gets off at the destination, the driver must travel on the return route without the passenger's guidance. At this time, the driver tries to return to the main road (prefectural road, etc.) through the road that has been driven by the passenger's guidance, but the driver actually travels as the return road on the road that has traveled as the outward path. You may become anxious without knowing.

However, although the technique described in Patent Document 1 can display map information of narrow streets, there is a problem that it is difficult to determine whether or not the vehicle travels with the traveled path as a return path.
The present invention focuses on the above points, and an object of the present invention is to provide information for facilitating determination of the direction of a traveling road when traveling in the reverse direction on a road that has traveled in the past. .

  In order to solve the above-described problems, according to one aspect of the present invention, a rear image obtained by capturing the rearward direction of the host vehicle is stored in the storage unit as presentation data in association with vehicle position information when the rear image is captured. . Then, according to one aspect of the present invention, based on the stored presentation data, a rear image in the presentation data corresponding to the vehicle position is displayed to the vehicle occupant in accordance with the timing at which the host vehicle reaches the vehicle position of the presentation data. Present.

  According to the present invention, for example, when the host vehicle travels on a return road on a road on which the host vehicle has traveled, the rear image captured on the outbound route is presented to the occupant at the timing when the host vehicle reaches the position of the road that has traveled on the outbound route. Here, since the traveling direction of the host vehicle is opposite in the forward path and the backward path, the rear image presented to the occupant is equivalent to an image showing the front of the vehicle in the backward path. For this reason, the driver obtains information for making it easier to determine the direction of the road on which the vehicle travels based on the presented rear image (image corresponding to the front image on the return route). As a result, it becomes possible for the driver to determine whether he / she actually travels using the road that has traveled as the forward path as the return path.

It is a block diagram for demonstrating the navigation apparatus of 1st Embodiment of this invention. It is a figure for demonstrating concretely that the vehicle information acquisition part shown in FIG. 1 acquires vehicle information. It is a figure for demonstrating the presentation image | video preparation part shown in FIG. It is the figure which illustrated the image | video produced by the image | video process part shown in FIG. It is a flowchart for demonstrating operation | movement of the navigation apparatus of 1st Embodiment. It is a figure for demonstrating the navigation apparatus of 2nd Embodiment of this invention. It is a figure for demonstrating the speech recognition part shown in FIG.

Hereinafter, a navigation device according to an embodiment of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a block diagram for explaining the navigation device of the first embodiment. The navigation device 101 of the first embodiment is a navigation device mounted on the host vehicle. The navigation device 101 includes a communication unit 109 and is configured to be able to communicate with the server device 111 of the data center 113 through the communication unit 109. The data center 113 includes a probe DB (database) 112. The probe DB 112 receives and accumulates video images captured by each vehicle from a plurality of vehicles c1, c2, and c3 as provided data including an imaging position. Such vehicles c1 to c3 are hereinafter also referred to as probe cars. The server device 111 accumulates the provision data including the video provided by the probe car in the probe DB 112 and provides the provision data to another vehicle (for example, the vehicle c4) in response to a request.

Note that the data center 113 is configured by a system that receives radio waves from, for example, a transmitter attached to the vehicle and manages the position and status of the traveling vehicle.
Here, the present invention does not necessarily require a communication function with the data center 113.
The navigation device 101 is mounted on the host vehicle, and a rear camera 102 that captures an image in the opposite direction (rear) to the traveling direction of the host vehicle (hereinafter referred to as a rear image), and a host vehicle position that detects the position of the host vehicle. The acquisition unit 103, the vehicle information acquisition unit 104, the vehicle change detection unit 110, and the rear image, the position of the own vehicle detected by the own vehicle position acquisition unit 103 when the rear image is captured (hereinafter referred to as vehicle position and Information storage processing unit 105 that records as presentation data in association with the recording data, presentation video creation unit 106 that creates a video to be presented based on the rear video of the presentation data recorded by information storage processing unit 105, and the presentation video. And a display unit 108 for displaying to a vehicle occupant.

Furthermore, the navigation apparatus 101 includes a map DB 107 that is a storage unit that accumulates presentation data including a presentation video (back video).
In such a first embodiment, when traveling from the destination, the rear video is captured and sequentially recorded on the travel route (hereinafter referred to as the forward route) until the destination is reached. In addition, on a travel route that departs from the destination and returns (hereinafter referred to as a return route), the images captured and recorded on the outbound route are sequentially presented to the passengers of the host vehicle as information images for traveling guidance ahead of the vehicle.

(Constitution)
Next, the configuration of the present embodiment will be described.
FIG. 2 is a diagram for specifically explaining that the vehicle information acquisition unit 104 acquires vehicle information. The host vehicle shown in FIG. 2 is a front wheel steering vehicle.
As shown in FIG. 2, the host vehicle has a rear camera 102, a vehicle speed sensor 2, a yaw rate sensor 3, an acceleration sensor 4, a steering angle sensor 5, and a direction indicator sensor 7 that detects an operation on the direction indicator. . These sensors output detection signals to the vehicle information acquisition unit 104.

The rear camera 102 is mounted on the vehicle in a state where the imaging axis is directed to the rear of the host vehicle, and images a landscape (traveling environment) behind the host vehicle. Then, the captured video is output to the information storage processing unit 105 as a rear video. The video is a still image, for example.
The vehicle speed sensor 2 detects the rotational speed of the wheel. For example, a rotary encoder attached to a wheel can be used. The vehicle speed is measured by detecting a pulse signal generated in proportion to the rotation of the wheel.

  The yaw rate sensor 3 detects the yaw rate generated in the host vehicle. For example, a device configured using a crystal resonator or a semiconductor is used. The acceleration sensor 4 detects acceleration in a specific direction generated in the host vehicle. For example, a device configured using a piezoelectric element or the like is used. The steering angle sensor 5 detects the rotation angle of steering. For example, the steering angle sensor 5 is provided in the steering column, and the steering angle of the steering wheel 8 is detected. The direction indicator sensor 7 detects whether an operation of a direction indicator switch for operating a direction indicator (not shown) indicates a right turn or a left turn. Thereby, the change of the advancing direction among the vehicle behavior changes can be detected.

  The acceleration sensor 4 can detect a brake operation (rapid braking) that stops the host vehicle in a time shorter than a preset time. Sudden braking can be detected by the brake operation amount itself. In other words, this makes it possible to detect a change in braking / driving force that exceeds a preset value. The vehicle speed sensor 2 can detect that the host vehicle has traveled at a speed lower than a preset speed.

Returning to FIG. 1, the own vehicle position acquisition unit 103 acquires position information (latitude and longitude information) of the own vehicle using GPS (Global Positioning System). The own vehicle position acquisition unit 103 continuously acquires position information in a preset time cycle, and sequentially passes the detected position information to the information storage processing unit 105 and the presentation video creation unit 106.
The vehicle information acquisition unit 104 acquires vehicle information that is information indicating the operation state of the host vehicle from the vehicle speed sensor 2, the yaw rate sensor 3, the acceleration sensor 4, the steering angle sensor 5, and the direction indicator sensor 7.

  The vehicle change detection unit 110 detects a preset behavior change among the vehicle behavior changes of the host vehicle. Detection is based on information related to a change in the traveling direction of the host vehicle, a change greater than or equal to a preset change in braking / driving force, and a change in vehicle speed below a preset vehicle speed. The change in the traveling direction of the host vehicle can be detected based on the steering angle information. The change more than the preset braking / driving force can be detected by the longitudinal acceleration and the brake operation amount. A change in the vehicle speed below a preset vehicle speed can be detected by a vehicle speed sensor.

The information storage processing unit 105 receives a rear video from the rear camera 102. In addition, position information of the own vehicle is received from the own vehicle position acquisition unit 103. And the presentation data matched with the vehicle position information at the time of imaging a back image | video and the back image | video are accumulate | stored in map DB107.
At this time, the information storage processing unit 105 stores the presentation data in the map DB 107 only when the vehicle change detection unit 110 detects the set behavior change. Alternatively, the information storage processing unit 105 adds presentation position information to the presentation data stored in the map DB 107 as information indicating that the set behavior change has been detected, and performs presentation data accumulation processing. In the following example, a case will be described where the presentation data is stored in the map DB 107 only when the vehicle change detection unit 110 detects the set behavior change.

The presentation video creation unit 106 operates when there is an information presentation request, for example, by a driver's operation. In other words, the presentation video creation unit 106 is configured to start the video presentation process by detecting the start of the return path when an occupant of the host vehicle inputs an operation signal.
Then, the presentation video creation unit 106 acquires position information related to the current position of the host vehicle from the host vehicle position acquisition unit 103. Then, the presentation video creation unit 106 extracts the presentation data of the position ahead of the traveling direction by a predetermined distance from the current vehicle position of the acquired own vehicle from the map DB 107, and displays the rear video in the extracted presentation data as the presentation video. Is displayed on the display unit. With this display, the rear video in the presentation data is presented to the vehicle occupant. At this time, when the presentation position information is set in the presentation data, it is preferable that only the rear video of the presentation data with the presentation position information is presented to the vehicle occupant. The rear video of the presentation data in which the presentation position information is set is a video when the setting behavior change occurs in the vehicle. That is, for example, it is possible to notify the passenger of the host vehicle of the position to turn right before the host vehicle reaches the position to turn right. For this reason, the driver can calm down and operate the host vehicle.

  Furthermore, the presentation video creation unit 106 determines whether or not the rear video received from the information storage processing unit 105 can be adopted as the presentation video when creating the presentation video. And when it determines with a back image | video being inappropriate as a presentation image | video, the provision data containing the image | video image | photographed in the vehicle position of the image | video presentation position in probe DB112 via the communication part 109 are acquired. And the image | video in the acquired provision data is shown to a passenger | crew via a display part.

The determination of whether or not the rear image is appropriate is performed, for example, as follows.
FIG. 3 is a diagram for explaining the presentation video creation unit 106 according to the first embodiment. As shown in FIG. 3, the presentation video creation unit 106 includes a contrast determination unit 301, a presentation video determination unit 302, a rear video acquisition unit 303, and a video processing unit 304.
The contrast determination unit 301 determines the contrast of the rear video received from the map DB. That is, the contrast determination unit 301 divides the rear video into a plurality of relatively small areas, for example. Then, a difference in luminance between adjacent pixels among the pixels included in this region is calculated, and this average value is calculated. Then, the size of the entire area in which the difference in luminance is smaller than a preset threshold is output to the presentation video determination unit 302.

  The presentation video determination unit 302 determines whether or not the rear video is appropriate as the presentation video based on the determination result of the contrast determination unit 301. That is, the presented video determination unit 302 compares the ratio of the size received from the contrast determination unit 301 in the rear video with a preset threshold value. And when this ratio is larger than a threshold value, it determines with this back image | video being unsuitable for a presentation image | video.

  Here, the reason why it is determined that the rear video is inappropriate for the presentation video when the area where the luminance difference is smaller than the threshold is large in the rear video is as follows. That is, when the difference in brightness is small in the wide range of the rear image, there is a possibility that the following vehicle is reflected in the rear image and it is difficult to visually recognize the scenery. In addition, when the difference in luminance is small over a wide range of the rear image, it may be difficult to visually recognize the landscape from the rear image due to rain, fog, or the like.

Alternatively, the video improper determination is made as video improper when, for example, an obstacle such as another vehicle is projected at a rate higher than that set in advance with respect to the video screen.
When the presentation video determination unit 302 determines that the rear video is inappropriate, the rear video acquisition unit 303 acquires the rear video whose vehicle position information matches the inappropriate rear video from the probe DB 112 illustrated in FIG. To do. That is, the rear video acquisition unit 303 communicates with the server device 111 and extracts from the probe DB 112 another video whose position information matches the inappropriate rear video.

  Here, the provided data of the probe DB 112 includes the vehicle type information of the vehicle that captured the video, together with the video and position information. The presentation video creation unit 106 acquires the vehicle type information of the host vehicle from the vehicle information acquisition unit 104 when acquiring the rear video from the probe DB 112. Then, a rear image captured by a vehicle that matches or approximates the vehicle type of the host vehicle is preferentially acquired. In this case, it is possible to use a rear video image similar to the scenery actually seen on the return path of the host vehicle as the presentation video. For example, this processing is configured such that vehicle information is transmitted to the server device, and provided data corresponding to the vehicle information is searched on the server device side.

  The video processing unit 304 performs processing for processing the presented rear video as necessary. In the processing, for example, a process of creating a video in which a video (such as an arrow) based on vehicle information is superimposed on the rear video is performed. In this case, the driver can remember the operation that was the position of the forward path where the rear image was captured. This makes it easier for the driver to understand the return path. Alternatively, in order to realize that it was difficult to drive on the outbound route, it can be expected to alert the driver that the point is difficult to drive.

  Moreover, the said process process performs the process which changes the brightness of a back image according to the time slot | zone when the own vehicle drive | works a return path, for example. Changing the brightness can be realized by reducing the brightness of the rear image or by correcting so that B of RGB of the pixel is increased. In this case, when driving on the forward path when the road is bright and driving on the return path after darker, the rear image captured on the forward path can be brought close to the scenery of the return path, and the driver can easily recognize the return path intuitively.

  Moreover, the said process process performs the process process which shifts the position of the back image to show to the position as an image ahead of a vehicle, for example. For example, when there is a lane on the forward path (that is, the return path), the center of the rear image captured on the forward path is changed to be shifted in accordance with the lane in which the vehicle travels on the return path. According to such a configuration, it is possible to make the rear image captured on the forward path close to the actual scenery of the return path, and to make it easier for the driver to intuitively recognize the return path.

  FIGS. 4A, 4 </ b> B, and 4 </ b> C are diagrams illustrating the processing of the rear video by the video processing unit 304. FIG. 4A is a diagram illustrating a video in which a video based on vehicle information is superimposed on a rear video. In the video illustrated in FIG. 4A, vehicle information indicating a right turn is represented by a video indicated by an arrow 401, and the video indicated by the arrow 401 is superimposed on the rear video. FIG. 4B is a diagram illustrating an example in which the brightness of the rear image shown in FIG. 4A is reduced when the return path is in the evening or the like. FIG. 4C is a diagram illustrating an example in which the center of the rear image shown in FIG. 4A is processed to be shifted to the left side in the drawing.

  The display unit 108 is a display that displays the presentation video received from the presentation video creation unit 106. As long as the display is a display that can obtain a video quality comparable to the scenery where the rear image is viewed, such as an LCD (Liquid Crystal Display), PDP (Plasma Display Panel), EL (electroluminescence display), etc. May be used.

(Operation other)
Next, the operation of the navigation device of the first embodiment will be described.
FIG. 5 is a flowchart for explaining the operation of the navigation device of the first embodiment. The information storage processing unit 105 records, in the map DB, presentation data in which position information of the host vehicle is associated with a rear image captured at the timing when an event (specific vehicle behavior) occurs on the forward path (step S501).
Next, the presentation video creation unit 106 determines whether or not to start traveling on the return path by an occupant's operation or the like (step S502). When traveling on the return path has not started (step S502: No), the presentation video creation unit 106 enters a standby state.

On the other hand, if it is determined to start traveling on the return path (step S502: Yes), the presentation video creation unit 106 acquires presentation data corresponding to a position away from the own vehicle position by a preset distance in the traveling direction from the map DB 107. . And the image | video of the acquired presentation data is displayed on a display part. The presentation video creation unit 106 performs this process sequentially during the backward travel, thereby presenting the rear video captured on the forward path to the driver so as to reversely play back (step S503).
Here, the rear image on the forward path becomes an image corresponding to the front image on the return path, and thus is displayed on the display unit as an image indicating the direction in which the vehicle should travel in the forward path. Therefore, the driver can travel with peace of mind on the road traveled on the forward path by being guided to travel in the same direction as the presented image.

Moreover, in the said embodiment, the case where only a back image | video when the preset vehicle behavior change (event) generate | occur | produces is made into a presentation image | video. Instead of this, it is possible to record the presentation data consisting of the rear image and the vehicle position at a preset time interval regardless of whether or not the vehicle behavior has changed, and to present the presentation data on the forward path. good.
Here, the host vehicle position acquisition unit 103 corresponds to the vehicle position acquisition unit. The rear camera 102 corresponds to the rear imaging unit. The map DB 107 corresponds to a storage unit. The presentation video creation unit 106 and the display unit 108 correspond to a video presentation unit. The probe DB corresponds to an external database.

(Effect of 1st Embodiment)
This embodiment has the following effects.
(1) The information storage processing unit 105 associates the rear image captured by the rear camera 102 with the vehicle position information when the rear image is captured based on the vehicle position information acquired by the host vehicle position acquisition unit 103. Is stored in the map DB as presentation data. Then, the presentation video creation unit 106 displays a rear video in the presentation data corresponding to the vehicle position based on the presentation data in accordance with the timing when the host vehicle reaches the vehicle position of the presentation data stored in the map DB. Present it to the crew.

  According to this configuration, when the host vehicle travels on a return road, for example, when the host vehicle travels on the return path, the rear image captured on the forward path is presented to the occupant at the timing when the host vehicle reaches a road position that has passed on the forward path. Here, since the traveling direction of the host vehicle is opposite in the forward path and the backward path, the rear image presented to the occupant corresponds to the image in front of the vehicle in the backward path. For this reason, the driver obtains information for determining the direction of the road on which the vehicle travels based on the presented rear image (image corresponding to the front image on the return route). As a result, it becomes possible for the driver to determine whether he / she actually travels using the road that has traveled as the forward path as the return path.

(2) The presentation video creation unit 106 presents a rear video in the presentation data corresponding to a position ahead of the traveling direction by a preset distance from the current vehicle position of the host vehicle.
According to this configuration, the driver can determine the traveling direction in advance by presenting an image of the position where the host vehicle will be located in the future. As a result, it becomes easier to travel along the target road.
For example, it is possible to prevent the driver from being instructed to turn right or left after entering the intersection.

  (3) The information storage processing unit 105 stores the presentation data in the storage unit when detecting a preset setting behavior change, or presents the presentation data stored in the storage unit as information indicating the setting behavior change. Processing to add position information is performed. Based on the presentation data, the presentation video creation unit 106 displays a rear video in the presentation data corresponding to the vehicle position in accordance with the timing at which the host vehicle reaches the vehicle position when the set behavior change is detected. Present to vehicle occupants.

According to this configuration, an image when the set behavior change occurs as the behavior change of the vehicle is presented. Since the timing at which the behavior change of the vehicle occurs is an event for which a road should be confirmed, the traveling road can be easily confirmed by presenting a video when such an event occurs.
As a result of presenting the video only when it is presumed that guidance information is necessary for the driver, if only the video when the event that causes the behavior change of the vehicle occurs is presented, The burden on the driver is reduced.

(4) The detection of the change in the set behavior is detected based on information related to at least one change in change in the traveling direction of the host vehicle, a change in braking / driving force more than a preset value, and a change in vehicle speed below a preset vehicle speed. To do. The change of the traveling direction of the host vehicle can be determined by the change of the steering angle or the operation information of the direction indicator. The change beyond the preset braking / driving force can be determined by the brake operation amount, the braking force, and the like. The change of the vehicle speed below the preset vehicle speed can be determined by the vehicle speed.
Such a change in vehicle behavior is a change in the driving situation by the driver, and is an event for the driver to check the road. Confirmation of road becomes easy.

(5) The presentation video creation unit 106 presents information on the vehicle behavior in the presentation data in a superimposed manner on the rear video. The information on the vehicle behavior includes the course direction, speed, brake operation, and the like.
According to this configuration, since the driver can remember the operation that was the position of the forward path where the rear image was captured, the driver can more easily understand the return path.
In some cases, it also leads to alerting the driver of the contents to be operated.

(6) The presentation video creation unit 106 presents the rear video to be presented to the occupant after processing the brightness according to the time zone to be presented.
According to this configuration, the video to be presented is a video close to the video in the time zone of the return trip, and the driver can easily compare the presented video with the actual landscape.
(7) The presentation video creation unit 106 presents to the occupant after processing to shift the position of the rear video to be presented to the position as the video ahead of the vehicle.
According to this configuration, the video to be presented becomes a video close to the scenery in front of the vehicle on the return path, and the driver can easily compare the presented video with the actual scenery.

(8) The navigation device has a communication function of communicating with an external database storing provision data including position data and images provided from a plurality of vehicles, and acquiring the provision data in the database. When the presentation video creation unit 106 determines that the rear video of the presentation data stored in the map DB is inappropriate for presentation, the presentation video creation unit 106 communicates with the external database to display a video at the same vehicle position as the vehicle position of the presentation data. Obtain provided data and present it to the crew.
According to this configuration, it is possible to perform navigation based on the video even when the rear video captured on the forward path is inappropriate as the presentation video, or when a road that cannot capture the rear video on the forward path is selected as the return path.

(Modification)
The first embodiment is not limited to the configuration described above. For example, in the configuration described above, the video from the rear camera is a still video. However, the rear camera may capture a moving image. In such a case, the information storage processing unit sequentially records the moving image captured by the rear camera in association with the position information, and the presentation video creation unit 106 cuts out the rear video from the video in accordance with the timing of the event occurrence. May be. Furthermore, when the rear camera captures a moving image, the first embodiment can also use the moving image as it is for the presented video. In such a configuration, processing is performed to synchronize the moving image and the position of the vehicle on the return path.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected and demonstrated about the structure similar to the said 1st Embodiment.
In the second embodiment, the operation of the vehicle is an event at the video presentation position in the first embodiment, whereas the voice spoken by the passenger of the host vehicle is the event at the video presentation position.

(Constitution)
FIG. 6 is a diagram for explaining the navigation device 101 according to the second embodiment. Among the configurations shown in FIG. 6, configurations similar to those shown in FIG. 1 are denoted by the same reference numerals, and description thereof is partially omitted. The navigation device 101 according to the second embodiment is different from the first embodiment in that a voice recognition unit 604 is provided.

FIG. 7 is a diagram for explaining the speech recognition unit 604 shown in FIG.
The speech recognition unit 604 includes a phoneme analysis unit 701 that inputs speech, recognizes the speech by breaking it into phonemes, and a keyword extraction unit 702 that extracts a preset keyword from the speech recognized by the phoneme analysis unit 701. ing. When the keyword extracting unit 702 extracts a preset keyword, the extracted information is output to the information storage processing unit. In addition, what is necessary is just to employ | adopt a well-known technique as a speech recognition system for an audio | voice extraction process.

When the event information indicating that a preset keyword is extracted from the voice recognition unit 604 is input from the voice recognition unit 604, the information storage processing unit stores the rear video at that time in the map DB as presentation data to which vehicle position information is added. The information storage processing unit also provides the presentation data with the vehicle position information added to the rear image at the time when the event information indicating that the setting behavior change is detected is input from the vehicle change detection unit 110 described in the first embodiment. Is stored in the map DB.
Other configurations are the same as the configurations described in the first embodiment.

(Operation)
The phoneme analysis unit 701 decomposes the input speech into phonemes. Phonemes are input to the keyword extraction unit 702 in the order in which they are generated. The phonemes input to the keyword extraction unit 702 are, for example, data each representing one sound, such as “ko”, “ko”, “wo”, “u”, “se”, and “tsu”.
The keyword extraction unit 702 compares the input phoneme with a preset keyword. When the phonemes that are sequentially input match the keyword, an event occurrence notification for notifying that an event has occurred is output to the information storage processing unit.
The information storage processing unit 105 stores the presentation data including the rear video in the map DB in accordance with the event occurrence timing.

Then, when the host vehicle approaches the position where the event occurs on the outbound route, the rear image is extracted from the map DB and displayed on the display unit 108 to be presented to the driver.
Here, the event of the second embodiment occurs when an occupant speaks a preset keyword. The keyword can be set so that the occupant speaks intentionally, or the keyword is uttered unintentionally by the occupant.

  In the case of using words intended by the occupant as keywords, for example, words such as “camera”, “imaging”, and “check” can be used as keywords. In such a case, the occupant speaks a keyword when he / she travels on the forward path and reaches a point to be referred to on the return path. The information storage processing unit stores the rear video as presentation data in the map DB at the timing when the occupant speaks.

In this way, the driver can present the video on the return route and speak a specific keyword at the point where he / she wants to go, so that the rear video is recorded and then the video is displayed when the vehicle approaches that point on the return route. Present. For this reason, a presentation image can be created when the driver approaches a point to be confirmed on the return path.
In the case of using words that are spoken unintentionally by the occupant as keywords, for example, words such as “cannot turn back once”, “narrow”, and “dangerous” can be used as keywords. In such a case, the occupant utters a keyword when he / she reaches a point to be aware of while traveling on the forward path. The information storage processing unit records the rear video in the map DB at the timing when the occupant speaks, and enables presentation.

In this case, even if the driver is not conscious, it is possible to present a video of a point to be noted on the return path.
Furthermore, in the second embodiment, words spoken by not only the driver but also the passenger can be matched with the keyword. When matching a keyword spoken by a passenger with a keyword, for example, words such as “here”, “turn right”, and “next signal” are set as keywords.

The terms “here”, “turn right”, and “next signal” are likely to be used when the passenger guides the driver on the way out. For this reason, according to the said structure, a back image | video is imaged at the timing when the passenger instruct | indicated the road to the driver in the outward path. Then, the presentation video can be created using the rear video. Since the driver can travel on the return path while referring to the rear image of the position where the instruction is received on the outward path, the driver can easily recognize the return path.
In the second embodiment described above, the phoneme analysis unit 701 corresponds to a speech recognition unit.

(Effect of 2nd Embodiment)
In addition to the effects of the first embodiment, the second embodiment has the following effects.
(1) When the navigation device detects a voice including a preset keyword, the navigation device records the rear video at that time together with the vehicle position as presentation data. And the presentation image | video preparation part 106 presents the said back image | video according to the timing which the own vehicle arrives at the vehicle position corresponding to the said presentation position.
According to this configuration, it is possible to present a video for driving guidance when approaching a point where a voice including a preset keyword is detected.
For example, when the occupant consciously speaks, it is possible to present a video that the occupant wants to refer to on the return path. In addition, words spoken without the consciousness of the occupant can be used as keywords.

DESCRIPTION OF SYMBOLS 101 Navigation apparatus 102 Rear camera 103 Own vehicle position acquisition part 104 Vehicle information acquisition part 105 Information storage process part 106 Presentation image creation part 108 Display part 109 Communication part 110 Vehicle change detection part 111 Server apparatus 113 Data center 301 Contrast determination part 302 Presentation Video determination unit 303 Rear video acquisition unit 304 Video processing unit 604 Voice recognition unit 701 Phoneme analysis unit 702 Keyword extraction unit 107 Map DB
112 Probe DB

Claims (10)

A vehicle position acquisition unit for acquiring position information of the own vehicle;
A rear imaging unit that images rearward of the traveling direction of the host vehicle;
Based on the vehicle position information acquired by the vehicle position acquisition unit, information storage for storing the rear image captured by the rear imaging unit in the storage unit as presentation data in association with the vehicle position information when the rear image is captured A processing unit;
A video presentation unit for presenting a rear video in the presentation data corresponding to the vehicle position to a vehicle occupant in accordance with the timing at which the host vehicle reaches the vehicle position of the presentation data stored in the storage unit based on the presentation data; A navigation device comprising:   The navigation according to claim 1, wherein the video presentation unit presents a rear video in the presentation data corresponding to a position ahead of the traveling direction by a preset distance from the current vehicle position of the host vehicle. apparatus. A vehicle change detector for detecting a preset behavior change among the vehicle behavior changes of the host vehicle;
The information storage processing unit stores the presentation data in a storage unit when the vehicle change detection unit detects the set behavior change, or provides presentation position information indicating information on which the set behavior change is detected. Process to add to the presentation data stored in
Based on the presentation data, the video presentation unit displays a rear video in the presentation data corresponding to the vehicle position to the vehicle occupant in accordance with the timing when the host vehicle reaches the vehicle position when the set behavior change is detected. The navigation device according to claim 1 or 2, wherein the navigation device is presented.   The detection of the set behavior change is detected based on information on a change in the traveling direction of the host vehicle, a change in braking / driving force more than a preset value, and a change in vehicle speed below a preset vehicle speed. The navigation device according to claim 3. The presentation data includes information on vehicle behavior,
The navigation device according to any one of claims 1 to 4, wherein the video presentation unit presents information related to vehicle behavior in the presentation data in a superimposed manner on a rear video. A voice recognition unit for recognizing voice spoken by a passenger of the vehicle,
A keyword determination unit that determines whether or not the voice recognized by the voice recognition unit includes a preset keyword;
The information storage processing unit records the vehicle position when the keyword determination unit determines that the keyword is included, as a presentation position of the rear video,
The navigation according to any one of claims 1 to 5, wherein the video presentation unit presents the rear video according to a timing at which the host vehicle reaches a vehicle position corresponding to the presentation position. apparatus.   The navigation according to any one of claims 1 to 6, wherein the video presentation unit presents the rear video to be presented to an occupant after processing the brightness according to the time zone to be presented. apparatus.   The said image | video presentation part presents to a passenger | crew, after processing to which the position of the back image to show is shifted to the position as an image ahead of vehicles, The occupant of any one of Claims 1-7 characterized by the above-mentioned. Navigation device. Having a communication function of communicating with an external database storing provision data including position data and images provided from a plurality of vehicles to obtain the provision data in the database;
If the video presentation unit determines that the rear video of the presentation data stored in the storage unit is inappropriate for presentation, the provided data includes a video of the same vehicle position as the vehicle position of the presentation data by communicating with the external database. The navigation apparatus according to claim 1, wherein the navigation apparatus is acquired and presented to the occupant. In the outward path where the host vehicle travels toward the destination, the rear image that is the image behind the vehicle traveling direction is imaged, and the presentation data that associates the vehicle position at the time of imaging the rear image is recorded.
A navigation method comprising presenting a rear image in presentation data corresponding to a current position of a host vehicle to a passenger of the host vehicle based on the recorded presentation data on a return path in which the host vehicle travels from the destination.

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