JP5459044B2 - Drive recorder - Google Patents

Description

  The present invention relates to a drive recorder.

  2. Description of the Related Art In recent years, drive recorders that capture and store a part of a vehicle or the surroundings of a vehicle when encountering an accident or a near-miss occurring during driving of the vehicle have been spreading. The drive recorder temporarily stores an image taken by a camera mounted on the vehicle in a temporary storage unit, and temporarily stores the vehicle acceleration detected by the acceleration detection unit before and after the upper limit value is exceeded when the vehicle acceleration exceeds the upper limit value. The image data stored in the means is stored in the saved data storage means. As a result, when an abnormal acceleration is applied to the vehicle due to an accident or a near-miss, image data before and after that is stored in the saved data storage means. The image data stored in the stored data storage means is used for elucidating the cause of an accident or a near-miss by reproducing the image data.

  By the way, from the viewpoint of protecting confidential information, there are cases where a restriction area for restricting photographing by various photographing means is set on a company site. In such a restricted area, restrictions are imposed such as prohibition of bringing in various photographing means such as a digital still camera and a video camera as well as a drive recorder, and prohibition of photographing. Therefore, every time the vehicle enters or exits the restricted area, the user needs to operate whether or not image data can be stored by the drive recorder. As a result, there is a problem that the operation becomes complicated.

JP 2009-141501 A JP 2008-312009 A JP 2008-064592 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a drive recorder that stores an image taken without requiring user operation and protects confidential information.

  According to the first aspect of the present invention, the restriction presence / absence judging means judges whether or not the vehicle is in the restricted area included in the map data based on the position of the vehicle detected by the position detecting means. That is, the restriction presence / absence judging means judges whether or not the vehicle is in the restricted area independently based on the position of the vehicle. The upper limit acceleration changing means sets the upper limit acceleration at the time of restriction when storing the image data stored in the temporary storage means as saved data when the vehicle is in the restricted area by the restriction presence / absence judging means. Change to acceleration. That is, the upper limit acceleration changing means changes the preset upper limit acceleration to a larger limit upper limit acceleration when the vehicle is in the restricted region. Therefore, when the vehicle is in the restricted area, the image data in the temporary storage means is stored in the saved data storage means when an acceleration greater than normal is applied to the vehicle. In other words, when the vehicle is in the restricted area, in order for the image data stored in the temporary storage means to be stored in the saved data storage means, it is necessary to apply a larger acceleration than usual to the vehicle. Thus, when the change in acceleration generated in the vehicle is relatively small, the image data is not stored as saved data. As a result, storage of image data in the restricted area is restricted, and confidential information is protected. Therefore, it is possible to store an image taken without requiring user operation and to protect confidential information.

  According to the second aspect of the present invention, the restriction presence / absence judging means judges whether or not the vehicle is in the restricted area included in the map data based on the position of the vehicle detected by the position detecting means. That is, the restriction presence / absence judging means judges whether or not the vehicle is in the restricted area independently based on the position of the vehicle. The encryption means stores the image data stored in the temporary storage means in the saved data storage means as encrypted saved data when the restriction presence / absence determination means determines that the vehicle is in the restricted area. That is, the encryption means performs an encryption process on the image data when the vehicle is in the restricted area. The encrypted saved data stored in the saved data storage means can be decrypted only by an external organization such as the police. As a result, the stored data stored in the restricted area cannot be arbitrarily reproduced, and the confidential information is protected. Therefore, it is possible to store the photographed image without requiring the user's operation and to protect the confidential information.

  According to a third aspect of the present invention, the restriction presence / absence judging means judges whether or not the vehicle is in the restricted area included in the map data based on the position of the vehicle detected by the position detecting means. That is, the restriction presence / absence judging means judges whether or not the vehicle is in the restricted area independently based on the position of the vehicle. The upper limit acceleration changing means sets the upper limit acceleration at the time of restriction when storing the image data stored in the temporary storage means as saved data when the vehicle is in the restricted area by the restriction presence / absence judging means. Change to acceleration. That is, the upper limit acceleration changing means changes the preset upper limit acceleration to a larger limit upper limit acceleration when the vehicle is in the restricted region. Therefore, when the vehicle is in the restricted area, the image data in the temporary storage means is stored in the saved data storage means when an acceleration greater than normal is applied to the vehicle. In other words, when the vehicle is in the restricted area, in order for the image data stored in the temporary storage means to be stored in the saved data storage means, it is necessary to apply a larger acceleration than usual to the vehicle. Thus, when the change in acceleration generated in the vehicle is relatively small, the image data is not stored as saved data. The encryption unit performs an encryption process on the image data stored as the saved data. The encrypted saved data stored in the saved data storage means can be decrypted only by an external organization such as the police. As a result, the saved data stored in the restricted area cannot be arbitrarily reproduced. As a result, storage of image data in the restricted area is restricted, and confidential information is protected. Therefore, it is possible to store an image taken without requiring user operation and to protect confidential information.

The block diagram which shows the structure of the drive recorder by one Embodiment 1 is a block diagram showing an in-vehicle LAN of a vehicle including a drive recorder according to an embodiment. The schematic diagram which shows the vehicle carrying the drive recorder by one Embodiment. The schematic diagram which shows the map data used with the drive recorder by one Embodiment Schematic showing the flow of operation of the drive recorder according to one embodiment The schematic diagram which shows visually the structure of the image data memorize | stored in the temporary memory part of the drive recorder by one Embodiment

Hereinafter, an embodiment of a drive recorder will be described with reference to the drawings.
As shown in FIG. 1, a drive recorder 10 according to an embodiment is configured integrally with an in-vehicle device 11 having a navigation function. Further, as shown in FIG. 2, the drive recorder 10 is communicably connected to a vehicle ECU (Electronic Control Unit) 12 that performs various controls of the vehicle and an engine ECU 13 that controls an engine (not shown) via an in-vehicle LAN 14. Has been. The in-vehicle device 11 including the drive recorder 10 is mounted on a vehicle 15 as shown in FIG. As shown in FIG. 1, the in-vehicle device 11 includes a control unit 20, a position detection unit 21, a map data storage unit 22, a map data input unit 23, an operation switch unit 24, a storage unit 25, a display unit 26, a voice controller 27, and a remote controller. A sensor 28 and the like are provided. The control unit 20 is mainly configured by a microcomputer having a CPU, a ROM, and a RAM (not shown).

  The position detection unit 21 detects the current position of the vehicle 15 on which the in-vehicle device 11 is mounted. The position detection unit 21 includes an azimuth sensor 31, a gyro sensor 32, a distance sensor 33, an acceleration sensor 34, and a GPS receiver 35. The direction sensor 31 detects the direction of the vehicle 15. The gyro sensor 32 detects the rotation angle of the vehicle 15. The distance sensor 33 detects the travel distance of the vehicle 15. The acceleration sensor 34 detects acceleration applied to the vehicle 15. The acceleration sensor 34 may be integrated with the gyro sensor 32 or shared with the gyro sensor 32. The GPS receiver 35 receives radio waves transmitted from GPS satellites (not shown) in order to determine the current position of the vehicle 15 by GPS (Global Positioning System).

  The map data storage unit 22 stores map data. As shown in FIG. 4, the map data 40 includes road map data 41, landmark data 42, map matching data 43, destination data 44, and traffic information formed by a plurality of nodes and links connecting the nodes. Various data such as table data 45 to be converted into data are included. The map data 40 includes a restricted area as restricted area data 46 together with road map data 41 and the like. The restricted area is an area where photographing of an image by the drive recorder 10 is restricted, such as a site of an office or a private property. Further, the map data 40 includes place names, facility names, and the like as point name data 47. The map data 40 stored in the map data storage unit 22 is read into the map data input unit 23 by a drive device (not shown). As the map data storage unit 22, for example, an optical storage medium such as a DVD or a CD, or a magnetic storage medium such as a flash memory or a hard disk drive is used.

  The operation switch unit 24 shown in FIG. 1 includes a mechanical switch provided in the vicinity of the screen of the display unit 26, a touch panel switch provided on the screen of the display unit 26, and the like. The user uses each switch of the operation switch unit 24 to set the destination of the vehicle 15 and switch the screen and display mode of the display unit 26 (for example, change the map scale, select the menu screen, search for a route, search for a route, Various commands for starting guidance, correcting the current position, adjusting the volume, etc. are input. Thereby, the vehicle-mounted apparatus 11 operate | moves according to a user's instruction | indication. The remote control sensor 28 transmits and receives commands and the like to and from the remote control 51 in a wired or wireless manner. The remote controller 51 is provided with a plurality of operation switches. By operating the operation switch of the remote controller 51, various command signals are input from the remote controller 51 via the remote control sensor 28 to the control unit 20. The operation switch unit 24 and the remote controller 51 can cause the control unit 20 to execute the same function by any operation.

  The storage unit 25 includes a temporary storage unit 52 and a saved data storage unit 53. The temporary storage unit 52 and the saved data storage unit 53 constituting the storage unit 25 are integrally configured by, for example, a flash memory or a hard disk drive. Further, the storage unit 25 including the temporary storage unit 52 and the saved data storage unit 53 may be configured integrally with the map data storage unit 22 described above. Furthermore, the temporary storage unit 52 may be configured to be shared with a RAM (not shown) of the control unit 20. Further, the storage area of the storage unit 25 is not physically divided into the temporary storage unit 52 and the saved data storage unit 53, but corresponds to storage in the temporary storage unit 52 by adding IDs to stored data, for example. It is good also as a structure which classify | categorizes whether it is data to be stored, or data equivalent to the memory | storage to the preservation | save data storage part 53. FIG. The display unit 26 includes a color display such as a liquid crystal or an organic EL. On the screen of the display unit 26, a map around the current position of the vehicle 15 is displayed at various scales, and a current location mark indicating the current position and the traveling direction of the vehicle 15 is displayed on the map display. Further, when performing route guidance to the destination, a route guidance screen is displayed on the screen of the display unit 26.

  The audio controller 27 is connected to the in-vehicle speaker 54. The sound controller 27 outputs sound from the in-vehicle speaker 54 based on the sound output signal from the control unit 20. The sound output from the in-vehicle speaker 54 is a sound related to guidance, a sound related to operation explanation, a sound notifying that the anti-theft function is in operation, a talkback sound corresponding to a sound recognition result, and the like.

  The control unit 20 displays a road map around the current location on the screen of the display unit 26 so that the vehicle 15 can move along the travel route, and displays a current location mark indicating the position and traveling direction of the vehicle 15 on the map. Overlaid on the road. In this case, the display of the current location moves on the map displayed on the display unit 26 as the vehicle 15 travels. The map displayed on the display unit 26 is scrolled according to the position of the vehicle 15. At this time, the control unit 20 performs map matching that matches the current position of the vehicle 15 on the road.

  In addition to the control unit 20, the position detection unit 21, the map data storage unit 22, the storage unit 25, and the acceleration sensor 34 of the in-vehicle device 11, the drive recorder 10 includes a camera 61 as a photographing unit, a restriction presence / absence determination unit 62, an upper limit. An acceleration changing unit 63 and an encryption unit 64 are provided. The acceleration sensor 34 corresponds to the acceleration detection means in the claims. The camera 61 is composed of a lens and a photographing element (not shown), and photographs the inside and outside of the vehicle 15. For example, as shown in FIG. 3, when the camera 61 is mounted in the vicinity of the windshield 65 of the vehicle 15, the camera 61 captures the dashboard of the vehicle 15 and the exterior front of the vehicle 15. The imaging element is, for example, a CMOS or a CCD, and converts a captured image into an electrical signal. The electrical signal output from the imaging element is converted into digital image data processed by the image processing unit 66 as shown in FIG.

  The temporary storage unit 52 constituting the storage unit 25 temporarily stores the image data generated by the image processing unit 66. On the other hand, the saved data storage unit 53 stores necessary image data among the image data stored in the temporary storage unit 52 as saved data. Specifically, when the absolute value of the acceleration of the vehicle 15 detected by the acceleration sensor 34 exceeds the upper limit acceleration, the control unit 20 temporarily stores the temporary storage unit within a predetermined time range before and after the upper limit acceleration is exceeded. The image data stored in 52 is stored in the saved data storage unit 53 as saved data. The control unit 20 stores, for example, image data corresponding to 10 seconds before the time when the upper limit acceleration is exceeded and 30 seconds after the time when the upper limit acceleration is exceeded in the saved data storage unit 53 as saved data. This upper limit acceleration is set in advance.

  The restriction presence / absence determining unit 62, the upper limit acceleration changing unit 63, and the encryption unit 64 are realized by software by a computer program executed by the control unit 20. Note that the restriction presence / absence determining unit 62, the upper limit acceleration changing unit 63, and the encrypting unit 64 may be realized in hardware. The restriction presence / absence determination unit 62 determines whether or not the vehicle 15 is in the restriction region. Specifically, the restriction presence / absence determination unit 62 determines the vehicle 15 based on the current position of the vehicle 15 detected by the position detection unit 21 and the restriction region data 46 included in the map data 40 stored in the map data storage unit 22. Is in the restricted area.

The upper limit acceleration changing unit 63 changes the preset upper limit acceleration to the limit upper limit acceleration when the restriction presence / absence determination unit 62 determines that the vehicle 15 is in the restriction region. This limit upper limit acceleration is set as a value larger than the upper limit acceleration. For example, when the upper limit acceleration for storing stored data in the saved data storage unit 53 is set to 0.3 G in a normal non-restricted area excluding the restricted area, the upper limit acceleration changing unit 63 sets the upper limit acceleration at the time of restriction in the restricted area. Change to 0.5G. The upper limit acceleration value of 0.3 G and the limit upper limit acceleration value of 0.5 G are merely examples for facilitating understanding, and are not limited thereto.
The encryption unit 64 encrypts the image data stored in the saved data storage unit 53 from the temporary storage unit 52 when the restriction presence / absence determination unit 62 determines that the vehicle 15 is in the restricted region. Specifically, the encryption unit 64 encrypts the image data stored in the temporary storage unit 52 with the encryption key data stored in the storage unit 25 to generate saved data.

Next, the flow of operation of the drive recorder 10 having the above configuration will be described with reference to FIG.
When the power of the vehicle 15 is turned on, the control unit 20 of the drive recorder 10 determines whether or not information on the position of the vehicle 15 and whether or not shooting is possible is available (S101). That is, the control unit 20 determines whether or not the position of the vehicle 15 can be acquired from the position detection unit 21 and whether or not the limited area data 46 can be acquired from the map data storage unit 22. If the control unit 20 determines that the information regarding the position of the vehicle 15 and the availability of photographing is not available (S101: No), it waits until these are available.

  When the information regarding the position of the vehicle 15 and the availability of photographing is obtained in S101 (S101: Yes), the control unit 20 starts acquiring an image from the camera 61, that is, storing the image data in the temporary storage unit 52 ( S102). That is, the control unit 20 stores the image data generated from the image captured by the camera 61 in the temporary storage unit 52. The temporary storage unit 52 temporarily stores, for example, image data corresponding to a shooting time of several tens of seconds to several minutes. When all the storage capacity in the temporary storage unit 52 is consumed, the latest image data is sequentially overwritten in the storage area in which the oldest image data is stored. Thus, the temporary storage unit 52 always stores image data corresponding to a predetermined shooting time. The control unit 20 acquires various types of information from the vehicle ECU 12 and the engine ECU 13 via the in-vehicle LAN 14 and stores them in the temporary storage unit 52 in synchronization with the storage of the image data in the temporary storage unit 52.

  The restriction presence / absence determination unit 62 determines whether or not the position of the vehicle 15 detected by the position detection unit 21 is in the restriction region (S103). That is, the restriction presence / absence determination unit 62 compares the position of the vehicle 15 detected by the position detection unit 21 with the restriction region data 46 included in the map data 40 stored in the map data storage unit 22, thereby comparing the vehicle 15. It is determined whether or not the current position of is in the restricted area. When it is determined that the vehicle 15 is in the restricted area (S103: Yes), the control unit 20 enters the time at which the vehicle 15 was first determined to be in the restricted area, that is, the time when the vehicle entered the restricted area. The time is stored in a time storage area (not shown) of the storage unit 25 (S104). In addition, even after the vehicle 15 enters the restricted area, the control unit 20 continuously accumulates image data generated based on an image captured by the camera 61 in the temporary storage unit 52.

  If it is determined in S103 that the vehicle 15 is in the restricted area, the control unit 20 notifies the fact that the vehicle 15 is traveling in the restricted area together with the storage of the entry time (S105). That is, for example, the control unit 20 emits a sound or a warning sound that the vehicle 15 is traveling in the restricted area from the vehicle-mounted speaker 54 via the voice controller 27, and audibly notifies the user of that. Moreover, the control part 20 may display on the display part 26 that the vehicle 15 is drive | working the restriction | limiting area | region, and may notify that to a user visually.

  Further, when the user is notified in S105, the upper limit acceleration changing unit 63 changes the upper limit acceleration to the upper limit acceleration at the time of restriction (S106). In other words, the upper limit acceleration changing unit 63 changes the upper limit acceleration set in advance as a reference for storing the image data captured by the camera 61 in the saved data storage unit 53 to a limit upper limit acceleration larger than the upper limit acceleration. In other words, when the vehicle 15 is in the restricted area, the upper limit acceleration changing unit 63 raises the reference for storing the image data as saved data from the upper limit acceleration to the upper limit acceleration at the time of restriction.

  After changing to the upper limit acceleration at the limit in S106, the control unit 20 determines whether or not the vehicle 15 has suddenly accelerated or decelerated beyond the upper limit acceleration at the limit (S107). Specifically, the control unit 20 acquires the acceleration applied to the vehicle 15 from the acceleration sensor 34, and determines whether or not the acquired acceleration exceeds the limit upper limit acceleration. For example, when an accident occurs or when the vehicle 15 suddenly accelerates or decelerates in order to avoid the accident, the acceleration of the vehicle 15 detected by the acceleration sensor 34 increases. Therefore, the control unit 20 acquires the acceleration applied to the vehicle 15 from the acceleration sensor 34 and monitors whether or not the vehicle 15 has suddenly accelerated or decelerated.

  If the control unit 20 determines in S107 that acceleration exceeding the upper limit acceleration limit is applied to the vehicle 15 (S107: Yes), the image data stored in the temporary storage unit 52 is stored in the saved data storage unit 53 as saved data. (S108). The image data stored in the temporary storage unit 52 is visually shown in FIG. In the case shown in FIG. 6, this corresponds to the time when acceleration exceeding the upper limit acceleration at both ends is applied. At this time, the temporary storage unit 52 includes pre-accident image data before the limit upper limit acceleration is exceeded, that is, before the accident occurs, and post-accident image data after the limit upper limit acceleration is exceeded, that is, after the accident occurs. It is remembered. In the case of the example shown in FIG. 6, when the acceleration applied to the vehicle 15 exceeds the upper limit acceleration, the control unit 20 has 10 seconds of pre-accident image data among the image data stored in the temporary storage unit 52. 30 seconds of the post-accident image data is stored in the saved data storage unit 53 as saved data. In the case of the example shown in FIG. 6, it means that the vehicle 15 exits from the restricted area to the unrestricted area after entering the restricted area from the unrestricted area where no restriction is applied.

  Thus, the image data stored in the saved data storage unit 53 from the temporary storage unit 52 may include image data captured in the non-restricted area and image data captured in the limited area. In this case, the control unit 20 stores the image data captured in the non-restricted area as it is in the saved data storage unit 53. On the other hand, when the image data captured in the restricted area is included in the image data stored in the saved data storage unit 53 from the temporary storage unit 52, the encryption unit 64 encrypts the image data stored in the temporary storage unit 52. Apply. Then, the control unit 20 stores the image data encrypted because it was captured in the restricted area in the saved data storage unit 53 as saved data. Specifically, the encryption unit 64 encrypts the image data captured in the restricted area among the image data stored in the temporary storage unit 52 using the encryption key data stored in the storage unit 25. . Then, the control unit 20 stores the image data encrypted by the encryption unit 64 in the saved data storage unit 53 as saved data. When storing the stored data in the saved data storage unit 53 in S108, the control unit 20 returns to S107.

  If it is determined in S107 that acceleration exceeding the upper limit acceleration at the time of restriction is not applied to the vehicle 15 (S107: No), the restriction presence / absence determining unit 62 determines whether or not the vehicle 15 has left the restricted area (S109). ). That is, the restriction presence / absence determination unit 62 compares the current position of the vehicle 15 detected by the position detection unit 21 with the restriction region data 46 included in the map data 40 as in S103, and the vehicle 15 leaves the restriction region. Determine whether or not. When determining that the vehicle 15 has left the restricted area (S109: Yes), the control unit 20 stores the time at which the vehicle 15 has left the restricted area in the time storage area of the storage unit 25 as an exit time (S110). Return to S101. On the other hand, if the control unit 20 determines that the vehicle 15 has not left the restricted area (S109: No), the control unit 20 returns to S107.

  By the way, if it is determined in S103 that the vehicle 15 is not in the restricted region (S103: No), the control unit 20 determines whether or not the acceleration applied to the vehicle 15 exceeds the upper limit acceleration (S111). In this case, the vehicle 15 is not in the restricted area, that is, is traveling in the non-restricted area. Therefore, the control unit 20 determines whether or not the acceleration applied to the vehicle 15 exceeds a preset normal upper limit acceleration.

  If the control part 20 judges that the acceleration which exceeds upper limit acceleration is not added to the vehicle 15 in S111 (S111: No), it will return to S101. On the other hand, if the control unit 20 determines in S111 that acceleration exceeding the upper limit acceleration has been applied to the vehicle 15 (S111: Yes), the image data stored in the limited area is included in the image data stored in the temporary storage unit 52. It is judged whether it is (S112). As described above, the vehicle 15 enters and exits between the restricted area and the non-restricted area. Therefore, even when the vehicle 15 is traveling in the non-restricted area, the image data stored in the restricted area may be included in the image data stored in the temporary storage unit 52. Therefore, the control unit 20 determines whether the image data stored in the temporary storage unit 52 includes image data of an image captured in the restricted area.

  If the control unit 20 determines in S112 that the image data stored in the temporary storage unit 52 includes image data captured in the restricted area (S112: Yes), the image data stored in the temporary storage unit 52 Is stored in the saved data storage unit 53 as saved data after performing a predetermined process (S113). Specifically, the encryption unit 64 encrypts image data captured in the restricted area among the image data stored in the temporary storage unit 52 and stores the encrypted image data in the saved data storage unit 53 as saved data. Further, the control unit 20 stores the image data captured in the non-restricted area among the image data stored in the temporary storage unit 52 in the saved data storage unit 53 as it is.

On the other hand, when the control unit 20 determines that the image data stored in the temporary storage unit 52 does not include image data captured in the restricted area in S112 (S112: No), the control unit 20 stores the image data in the temporary storage unit 52. All the image data stored in the storage data storage unit 53 is stored as it is (S114). That is, when image data shot in the restricted area is not included, all the image data stored in the temporary storage unit 52 corresponds to image data shot in the non-restricted area. Therefore, the image data stored in the saved data storage unit 53 from the temporary storage unit 52 does not include confidential matters. Therefore, the control unit 20 stores the image data stored in the temporary storage unit 52 in the saved data storage unit 53 as it is, as in a normal drive recorder. When the storage of the image data and the saved data in the saved data storage unit 53 is completed in S113 and S114, the control unit 20 returns to S101.
The control unit 20 repeatedly executes the above process while the vehicle 15 is powered on.

  In the embodiment described above, the restriction presence / absence determination unit 62 determines whether or not the vehicle 15 is in a restriction region where photographing with the camera 61 is restricted based on the position of the vehicle 15 detected by the position detection unit 21. to decide. That is, the restriction presence / absence determination unit 62 determines whether or not the vehicle 15 is in the restriction region independently based on the position of the vehicle 15. The upper limit acceleration changing unit 63 changes the upper limit acceleration to the limit upper limit acceleration when the restriction presence / absence determination unit 62 determines that the vehicle 15 is in the restricted region. That is, the upper limit acceleration changing unit 63 changes the preset upper limit acceleration to a larger limit upper limit acceleration when the vehicle 15 is in the restricted region. Therefore, when the vehicle 15 is in the restricted area, the image data in the temporary storage unit 52 is stored in the saved data storage unit 53 when an acceleration greater than normal is applied to the vehicle 15. That is, when the vehicle 15 is in the restricted area, in order for the image data stored in the temporary storage unit 52 to be stored in the saved data storage unit 53, it is necessary to apply a larger acceleration than usual to the vehicle 15. Thus, when the change in acceleration generated in the vehicle 15 is relatively small, the image data is not stored as saved data. The encryption unit 64 performs an encryption process on the image data stored as the saved data. The encrypted saved data stored in the saved data storage unit 53 can be decrypted only by an external organization such as the police. As a result, the saved data stored in the restricted area cannot be arbitrarily reproduced. As a result, storage of image data in the restricted area is restricted, and confidential information is protected. Therefore, it is possible to store an image taken without requiring user operation and to protect confidential information.

The embodiment described above is not limited to the above embodiment, and can be applied to various embodiments without departing from the scope of the invention.
In the above-described embodiment, when the vehicle 15 is in the restricted area, the upper limit acceleration changing unit 63 changes the upper limit acceleration serving as a reference for storing image data from the temporary storage unit 52 to the saved data storage unit 53 to the restricted upper limit acceleration. In addition to the above, an example of encrypting saved data stored in the saved data storage unit 53 has been described. However, the configuration may be such that the change of the upper limit acceleration to the limit upper limit acceleration and the encryption of stored data are performed separately. That is, when the vehicle 15 is in the restricted region, the upper limit acceleration changing unit 63 may only change the upper limit acceleration to the restricted upper limit acceleration. Thus, even if the upper limit acceleration is changed to the limit upper limit acceleration, the image data is not stored in the saved data storage unit 53 unless the acceleration applied to the vehicle 15 exceeds the limit upper limit acceleration larger than the upper limit acceleration. Therefore, it is possible to protect confidential information only by changing the upper limit acceleration, and it is possible to store an accident or a situation leading to an accident without requiring user operation.

  Furthermore, when the vehicle 15 is in the restricted area, the image data stored in the saved data storage unit 53 from the temporary storage unit 52 may be simply encrypted. As described above, even if the image data stored in the saved data storage unit 53 is only encrypted, the image captured by the vehicle 15 in the restricted area cannot be arbitrarily reproduced. Therefore, it is possible to protect confidential information just by encrypting image data without changing the upper limit acceleration, and it is possible to store an accident or a situation that leads to an accident without requiring user operation. it can.

  In the drawings, 10 is a drive recorder, 11 is an in-vehicle device, 15 is a vehicle, 21 is a position detection unit (position detection unit), 22 is a map data storage unit (map data storage unit), 34 is an acceleration sensor (acceleration sensor), 52 is a temporary storage unit (temporary storage unit), 53 is a saved data storage unit (saved data storage unit), 61 is a camera (photographing unit), 62 is a limit presence / absence determination unit (limitation presence / absence determination unit), and 63 is an upper limit acceleration change. Reference numeral (upper limit acceleration changing means) 64 denotes an encryption part (encryption means).

Claims (5)

Position detecting means for detecting the position of the vehicle;
Map data storage means for storing map data including a restricted area in which image capturing is restricted as restricted area data;
An imaging means mounted on the vehicle for capturing images of at least a part of the vehicle and the surroundings of the vehicle;
Temporary storage means for temporarily storing an image photographed by the photographing means as image data;
Acceleration detecting means for detecting acceleration applied to the vehicle;
When the acceleration applied to the vehicle detected by the acceleration detection means exceeds a preset upper limit acceleration, from the time when the acceleration applied to the vehicle out of the image data stored in the temporary storage means exceeds the upper limit acceleration. Saved data storage means for storing image data in a preset time range before and after as saved data;
Restriction presence / absence judging means for judging whether or not the position of the vehicle detected by the position detecting means is in the restriction region;
When the vehicle is determined to be in the restricted area in the limited state determining means, and a limit acceleration change means for changing the time limit upper acceleration limit value is larger than the preset value the upper limit acceleration ,
The stored data storage means stores the image stored in the temporary storage means when the acceleration applied to the vehicle detected by the acceleration detection means exceeds the limit upper limit acceleration even when the vehicle is in the restricted area. A drive recorder, wherein image data in a preset time range before and after the time point when acceleration applied to the vehicle exceeds the upper limit acceleration at the time of the data is stored as saved data . Position detecting means for detecting the position of the vehicle;
Map data storage means for storing map data including a restricted area in which image capturing is restricted as restricted area data;
An imaging means mounted on the vehicle for capturing images of at least a part of the vehicle and the surroundings of the vehicle;
Temporary storage means for temporarily storing an image photographed by the photographing means as image data;
Acceleration detecting means for detecting acceleration applied to the vehicle;
When the acceleration applied to the vehicle detected by the acceleration detection means exceeds a preset upper limit acceleration, from the time when the acceleration applied to the vehicle out of the image data stored in the temporary storage means exceeds the upper limit acceleration. Saved data storage means for storing image data in a preset time range before and after as saved data;
Restriction presence / absence judging means for judging whether or not the position of the vehicle detected by the position detecting means is in the restriction region;
An encryption means for encrypting saved data stored in the saved data storage means from the temporary storage means when the restriction presence / absence judging means determines that the vehicle is in the restricted area;
A drive recorder comprising: Position detecting means for detecting the position of the vehicle;
Map data storage means for storing map data including a restricted area in which image capturing is restricted as restricted area data;
An imaging means mounted on the vehicle for capturing images of at least a part of the vehicle and the surroundings of the vehicle;
Temporary storage means for temporarily storing an image photographed by the photographing means as image data;
Acceleration detecting means for detecting acceleration applied to the vehicle;
When the acceleration applied to the vehicle detected by the acceleration detection means exceeds a preset upper limit acceleration, from the time when the acceleration applied to the vehicle out of the image data stored in the temporary storage means exceeds the upper limit acceleration. Saved data storage means for storing image data in a preset time range before and after as saved data;
Restriction presence / absence judging means for judging whether or not the position of the vehicle detected by the position detecting means is in the restriction region;
Upper limit acceleration changing means for changing the upper limit acceleration to a limit upper limit acceleration that is a value larger than a preset value when it is determined by the limit presence / absence determination means that the vehicle is in the limit region;
An encryption means for encrypting saved data stored in the saved data storage means from the temporary storage means when the restriction presence / absence judging means determines that the vehicle is in the restricted area;
A drive recorder comprising: When the acceleration detection unit detects an acceleration exceeding the upper limit acceleration, the encryption unit includes the restriction presence / absence determination unit among the image data stored in the temporary storage unit. 3. The drive recorder according to claim 2, wherein image data photographed at a certain time is encrypted, and image data photographed when the vehicle is not in the restricted area is not encrypted by the restriction presence / absence judging means. When the acceleration detecting means detects an acceleration exceeding the upper limit acceleration at the limit, the encryption means determines that the vehicle is limited by the restriction presence / absence determining means among the image data stored in the temporary storage means. 4. The drive according to claim 3, wherein the image data photographed when the vehicle is in the area is encrypted, and the image data photographed when the vehicle is not in the restricted area is not encrypted by the restriction determination unit. Recorder.

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