Recording device

Abstract

To provide a technology for properly recording data when recording triggers occur.SOLUTION: A recording device capable of communicating with a server device that maintains a recording frequency for each type of recording trigger and each classification area includes: a location information acquisition unit that acquires location information of a self vehicle; a communication unit that transmits the location information of the self vehicle and vehicle type information of the self vehicle to the server device and receives from the server device the recording frequency corresponding to the location information of the self vehicle for each type of recording trigger; and a recording processing unit that allocates the recording area of an in-vehicle recording device of the self vehicle for each type of recording trigger based on the received recording frequency.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an in-vehicle recording device capable of communicating with a server device.

Background Art

[0002] Patent Document 1 discloses a drive recorder in which, when the vehicle's position belongs to the inside of a dangerous area at the time when a recording trigger occurs, image data acquired in the time before and after the time when the recording trigger occurs is recorded in a recording unit.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technology described in Patent Document 1, if the vehicle's position does not belong to the inside of a dangerous area, even if a recording trigger occurs, image data is not recorded, so image data generated outside the dangerous area cannot be analyzed.

[0005] An object of the present invention is to provide a technique for appropriately recording data when a recording trigger occurs.

Means for Solving the Problems

[0006] In order to solve the above problems, in one aspect of the present invention, a vehicle-mounted recording device that operates when the driving situation of a vehicle satisfies any one of a plurality of recording triggers receives the type of recording trigger and the vehicle position information at the time of operation, and a server device that holds the recording occurrence frequency of the vehicle-mounted recording device for each type of recording trigger and each divided area, and a vehicle-mounted recording device that can communicate with the server device, the vehicle-mounted recording device including a position information acquisition unit that acquires the position information of the host vehicle, a communication unit that sends the position information of the host vehicle and the vehicle type information of the host vehicle to the server device and receives from the server device the recording occurrence frequency corresponding to the position information of the host vehicle for each type of recording trigger, and a recording processing unit that assigns the recording area of the vehicle-mounted recording device of the host vehicle for each type of recording trigger based on the received recording occurrence frequency.

Effect of the Invention

[0007] According to the present invention, it is possible to provide a technique for appropriately recording data when a recording trigger occurs.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0009] FIG. 1 is a diagram for explaining the processing of the in-vehicle recording system of the embodiment. The in-vehicle recording system records the captured images of the in-vehicle camera and driving information such as vehicle speed and steering angle, and when a predetermined recording trigger is satisfied, a series of captured images and driving information at that time are recorded in the long term. For example, when the host vehicle violates traffic rules such as lane departure, temporary non-stop, and collision, when unstable driving such as slipping or sudden braking is detected, or when a pedestrian approaches, the recording trigger is established.

[0010] Depending on the driving area of the vehicle, the possibility of a specific recording trigger occurring increases. Here, since the recording device of the vehicle recording system divides the recording area for each type of recording trigger, if a specific recording trigger is continuously established, only the recording area of the specific recording trigger will be filled, and new records may be overwritten. Therefore, the vehicle recording system according to the embodiment dynamically changes the division of the recording area for each recording trigger.

[0011] In FIGS. 1(a) to 1(c), a first recording area 10, a second recording area 12, a third recording area 14, and a fourth recording area 16 are shown, and the sizes of the respective storage areas are the same. The first recording area 10, the second recording area 12, the third recording area 14, and the fourth recording area 16 can each be further subdivided and are assigned as the recording areas for the respective recording triggers. In FIG. 1(a), the first recording area 10 stores a series of captured images and driving information, and the second recording area 12, the third recording area 14, and the fourth recording area 16 are empty. A series of captured images are consecutive captured images in chronological order and are a video.

[0012] In FIG. 1(b), the vehicle recording system sets the first recording area 10 and the second recording area 12 as holding areas, and sets the third recording area 14 and the fourth recording area 16 as variable areas. The holding area is an area where changes to the division of the recording trigger are prohibited, and the variable area is an area where changes to the division of the recording trigger are possible. Thereby, while leaving the currently held data and the minimum recording area as the holding area, more of the other variable areas can be allocated to a specific recording trigger.

[0013] In FIG. 1(c), the vehicle recording system re - sets the classification of each recording trigger in the third recording area 14 and the fourth recording area 16 which are variable areas. For example, the third recording area 14 is assigned to the first recording trigger, half of the fourth recording area 16 is assigned to the second recording trigger, and the other half of the fourth recording area 16 is assigned to the third recording trigger. The first recording trigger is considered to have a high occurrence frequency in the area where the vehicle is running. Thereby, the recording area of the first recording trigger can be dynamically increased to suppress overwriting of new data.

[0014] FIG. 2 is a diagram showing the functional configuration of the vehicle recording system 1. The vehicle recording system 1 includes a recording device 20, a server device 22, an object detection sensor 24, and a driving state detection sensor 26. The vehicle recording system 1 may be mounted on an autonomous driving vehicle capable of autonomous driving, or may be mounted on a vehicle without an autonomous driving function.

[0015] The object detection sensor 24 includes an in - vehicle camera, a millimeter - wave radar, a lidar, a sound wave sensor, etc., and detects an object located around the vehicle. The object detection sensor 24 transmits information about the object indicating the positional relationship between the object and the host vehicle to the recording device 20.

[0016] The driving state detection sensor 26 detects the driving state of the vehicle. The driving state detection sensor 26 includes a vehicle speed sensor, a steering angle sensor, an acceleration sensor, a brake pressure sensor, etc., and transmits the result of detecting the driving state of the vehicle to the recording device 20.

[0017] The server device 22 includes a communication unit 44, a frequency calculation unit 46, and a holding unit 48. The communication unit 44 communicates with the recording device 20 via a network and transmits and receives information. The communication unit 44 collects the establishment information of the recording trigger from a plurality of vehicles. The establishment information of the recording trigger is generated based on the driving situation of the vehicle. The establishment information of the recording trigger includes the establishment time of the recording trigger, the type of the recording trigger, the position information of the vehicle at the time of the establishment of the recording trigger, the vehicle type information of the vehicle, and the like. The vehicle type information indicates, for example, the size of the vehicle. The establishment information of the recording trigger is held by the holding unit 48. When the driving situation of a plurality of vehicles satisfies any one of a plurality of recording triggers, the recording device 20 is activated to record a series of captured images and driving information, and the establishment information of the recording trigger is transmitted to the server device 22.

[0018] The frequency calculation unit 46 calculates the recording occurrence frequency of each recording trigger based on the number of occurrences of each recording trigger. The recording occurrence frequency may be a relative numerical value calculated from the number of occurrences of each recording trigger, or may be a ratio of each recording trigger. For example, when there are three types of recording triggers, the occurrence frequency of the first recording trigger may be 70%, the occurrence frequency of the second recording trigger may be 20%, and the occurrence frequency of the third recording trigger may be 10%. The recording occurrence frequency may also be calculated as an absolute value based on the number of occurrences of the recording trigger.

[0019] The frequency calculation unit 46 calculates the recording occurrence frequency for each divided area obtained by dividing the area. The divided area divides the area at preset intervals based on latitude and longitude. The frequency calculation unit 46 calculates the recording occurrence frequency by classifying according to the size and height of the vehicle according to the vehicle type information. The holding unit 48 holds the recording occurrence frequency of the recording device 20 for each type of recording trigger and for each divided area.

[0020] When the communication unit 44 receives the position information of the vehicle, the frequency calculation unit 46 generates the recording occurrence frequency based on the position information and the vehicle type information of the vehicle and transmits it to the vehicle.

[0021] The recording device 20 includes an acquisition unit 30, a position acquisition unit 32, a recognition processing unit 34, a recording determination unit 36, a recording unit 38, a recording processing unit 40, and a communication unit 42.

[0022] The acquisition unit 30 periodically acquires detection results from the object detection sensor 24 and the driving state detection sensor 26. The position acquisition unit 32 acquires the position information of the host vehicle using GNSS (Global Navigation Satellite System).

[0023] The recognition processing unit 34 recognizes the position and type of the object based on the detection result of the object detection sensor 24. The recognition processing unit 34 analyzes the captured image of the in-vehicle camera to identify the type of the object. The recognition processing unit 34 may identify the type of the object from the captured image using a neural network method, for example, a deep learning method. The objects include vehicles, pedestrians, traffic signs, road facilities, etc.

[0024] The recognition processing unit 34 detects whether the driving situation of the host vehicle is unstable based on the detection result of the driving state detection sensor 26. For example, when the recognition processing unit 34 detects slip or sudden braking, it determines that the driving situation of the host vehicle is unstable.

[0025] The recording determination unit 36 determines whether any one of a plurality of recording triggers is satisfied based on the detection result of the recognition processing unit 34, that is, based on the driving situation of the host vehicle. The plurality of recording triggers are preset and are satisfied when the driving situation of the host vehicle indicates a traffic violation, is unstable, etc.

[0026] The recording processing unit 40 causes the recording unit 38 to record a series of captured images and driving information based on the determination result of the recording determination unit 36, and generates information indicating the establishment of a recording trigger. The recording unit 38 temporarily stores consecutive captured images and driving information, records the several tens of seconds before and after the time when the recording trigger is satisfied, and discards the captured images and driving information that do not satisfy the recording trigger after a predetermined time. The recording unit 38 records a series of captured images that satisfy the recording trigger until they are overwritten or the data is erased due to a change in the recording area. That is, the data that satisfies the recording trigger is erased only by a change in the recording area. The recording processing unit 40 transmits the generated information indicating the establishment of the recording trigger from the communication unit 42 to the recording device 20.

[0027] The communication unit 42 periodically sends the position information of the host vehicle and the vehicle type information of the host vehicle to the server device 22, and receives from the server device 22 the recording occurrence frequency corresponding to the position information of the host vehicle for each type of recording trigger.

[0028] The recording processing unit 40 allocates the recording area of the recording device 20 of the host vehicle for each type of recording trigger based on the received recording occurrence frequency. This process will be described using a flowchart.

[0029] FIG. 3 is a flowchart of a process for dynamically allocating a recording area. The process shown in FIG. 3 is executed periodically. The communication unit 42 transmits the position information and vehicle type information of the host vehicle to the server device 22 (S10).

[0030] The server device 22 extracts the section area corresponding to the position information of the vehicle and the recording occurrence frequency of the same vehicle type, and transmits it to the recording device 20. The communication unit 42 receives the recording occurrence frequency for each recording trigger from the server device 22 (S12).

[0031] The recording processing unit 40 compares the frequency of recording occurrences received last time with the frequency of recording occurrences received this time, and determines whether the frequency of recording occurrences has changed (S14). If the frequency of recording occurrences has not changed (N in S14), this process ends. If the frequency of recording occurrences has changed (Y in S14), the recording processing unit 40 sets a variable region as shown in FIG. 1(b), and divides the storage region into a holding region and a variable region (S16). The holding region is set to be equal to or larger than a predetermined minimum region, and is set to leave the data recorded within a predetermined period.

[0032] The recording processing unit 40 calculates the allocation ratio for the set variable region according to the frequency of recording occurrences for each recording trigger (S18). The allocation ratio is calculated in proportion to the frequency of recording occurrences. Note that a priority is set for each recording trigger, and the recording processing unit 40 may allocate the remaining recording area after allocation to the recording trigger with a higher priority.

[0033] The recording processing unit 40 divides the holding region according to the calculated allocation ratio, and allocates a recording area to each recording trigger (S20). Thereby, the allocation of the holding region can be dynamically changed according to the position information of the vehicle.

[0034] The present disclosure has been described based on the embodiments. The present disclosure is not limited to the above-described embodiments, and various design changes and other modifications can be added based on the knowledge of those skilled in the art.

Description of Reference Numerals

[0035] 1 Vehicle recording system, 20 Recording device, 22 Server device, 24 Object detection sensor, 26 Travel state detection sensor, 30 Acquisition unit, 32 Position acquisition unit, 34 Recognition processing unit, 36 Recording determination unit, 38 Recording unit, 40 Recording processing unit, 42, 44 Communication unit, 46 Frequency calculation unit, 48 Holding unit.

Claims

Claim 1 An in-vehicle recording device that receives the type of recording trigger and the vehicle position information at the time of activation from an in-vehicle recording device that operates when the driving situation of the vehicle satisfies any one of a plurality of recording triggers, and holds the recording occurrence frequency of the in-vehicle recording device for each type of recording trigger and each divided area. The in-vehicle recording device is communicable with a server device, a position information acquisition unit that acquires the position information of the host vehicle; a communication unit that sends the position information of the host vehicle and the vehicle type information of the host vehicle to the server device and receives from the server device the recording occurrence frequency corresponding to the position information of the host vehicle for each type of recording trigger; a recording processing unit that assigns a recording area of the in-vehicle recording device of the host vehicle for each type of recording trigger based on the received recording occurrence frequency. The recording device is characterized by comprising the above components.

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