JP2023133380A - recording device - Google Patents

Abstract

To provide a technique for enabling presence/absence of occurrence of an impact for which video should be recorded to be detected with higher accuracy.SOLUTION: Provided is a recording device for recording a video on the basis of an impact, including: an acquisition unit that acquires acceleration data indicating an acceleration of a vehicle and vehicle speed data indicating a vehicle speed of the vehicle; and a determination unit that in a case where the acceleration and the vehicle speed acquired by the acquisition unit fall under at least any one of determination criteria corresponding to each of a plurality of accident classifications, determines that an impact for which the video should be recorded has occurred.SELECTED DRAWING: Figure 4

Description

The present invention relates to a recording device.

Currently, there are in-vehicle cameras called drive recorders that are capable of constantly recording images of the direction of travel and the like while the vehicle is running. By installing a drive recorder in the car they drive, drivers can use it to explain the circumstances of an accident and estimate the cause of the accident.

JP2018-65680A

Originally, the video that a drive recorder should record is the video at the time of the accident. However, many of the currently available drive recorders basically record images before and after the timing when the acceleration value simply exceeds the threshold value. Therefore, images are often recorded at times unrelated to the accident, such as when a simple vehicle operation is performed or when some kind of vibration occurs in the vehicle.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a technique that makes it possible to detect with higher accuracy whether or not an impact for which an image should be recorded has occurred.

A recording device according to one aspect of the present invention includes: an acceleration data acquisition unit that acquires acceleration data indicating acceleration of a vehicle; a maximum value of the magnitude of the acceleration in the longitudinal direction acquired by the acceleration data acquisition unit; The total value of the maximum value of the magnitude of the acceleration in the vertical direction acquired by the data acquisition unit is greater than a predetermined threshold, and the time when the maximum value of the magnitude of the acceleration in the longitudinal direction is measured, and the time when the maximum value of the magnitude of the acceleration in the vertical direction is measured. and a recording unit that records an image when the time when the maximum value of the acceleration magnitude is measured is within a predetermined period.

According to the present invention, it is possible to provide a technique that makes it possible to more accurately detect whether or not an impact for which an image should be recorded has occurred.

It is a diagram showing an example of the configuration of a drive recorder according to the present embodiment. It is a figure showing an example of a drive recorder. It is a figure showing an example of functional block composition of a drive recorder concerning this embodiment. 12 is a flowchart illustrating an example of a processing procedure when determining the presence or absence of an impact. FIG. 3 is a diagram showing an example of acceleration detected by an acceleration sensor. FIG. 3 is a diagram showing an example of acceleration detected by an acceleration sensor. 12 is a flowchart for explaining an example of a processing procedure for supplementary condition 2.

Embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in each figure, those with the same reference numerals have the same or similar configurations.

<Device configuration>
FIG. 1 is a diagram showing a configuration example of a drive recorder 10 according to the present embodiment. The drive recorder 10 includes a processor 11 , a memory 12 , an input device 13 , an output device 14 , a photographing device 15 , an acceleration sensor 16 , a GPS module 17 , and a storage medium 18 .

The input device 13 is, for example, an operation button, a touch panel, a microphone, or the like. The output device 14 is, for example, a display and/or a speaker. The photographing device 15 is a camera that photographs the front of the drive recorder 10. The photographing device 15 may further include a camera that photographs the rear of the vehicle. The acceleration sensor 16 is a sensor that measures the acceleration of the drive recorder 10 in the front-rear direction, left-right direction, and up-down direction. The GPS module 17 is a sensor that measures the current position of the drive recorder 10 by receiving radio waves from GPS satellites. The drive recorder 10 can acquire vehicle speed data of the vehicle in which the drive recorder 10 is mounted based on the moving speed of the current position measured using the GPS module 17. The storage medium 18 is a nonvolatile memory such as an SD card, and records images shot by the shooting device 15. Storage medium 18 may be removable.

FIG. 2 shows an example of the drive recorder 10. A lens of a photographing device 15 is provided in front of the drive recorder 10. The fixing part 20 is a base for fixing the drive recorder 10 to the windshield of a vehicle. The acceleration in the longitudinal direction measured by the acceleration sensor 16 corresponds to the acceleration in the X-axis direction. Similarly, acceleration in the left-right direction corresponds to acceleration in the Y-axis direction, and acceleration in the vertical direction corresponds to acceleration in the Z-axis direction.

Note that the hardware configuration shown in FIG. 1 is only an example, and the hardware configuration of the drive recorder 10 according to the present embodiment is not limited to the hardware configuration shown in FIG. 1. For example, the vehicle may further include an interface capable of inputting vehicle speed data output from an on-vehicle computer, or may include a communication IF for wireless communication. Further, some hardware such as the GPS module 17 may be omitted.

The drive recorder 10 (recording device) according to the present embodiment acquires the acceleration and vehicle speed of the vehicle to which the drive recorder 10 is attached, and determines whether an impact for which a video should be recorded has occurred based on the acquired acceleration and vehicle speed. Determine. Furthermore, when an impact for which a video should be recorded occurs, video data before and after the timing at which it is determined that the impact occurred is recorded.

<Functional block configuration>
FIG. 3 is a diagram showing an example of the functional block configuration of the drive recorder 10 according to the present embodiment. Drive recorder 10 includes a storage section 100, an acquisition section 101, a determination section 102, and a recording section 103. The storage unit 100 can be realized using the memory 12 and/or the storage medium 18 included in the drive recorder 10. Further, the acquisition unit 101, the determination unit 102, and the recording unit 103 can be realized by the processor 11 of the drive recorder 10 executing a program stored in the memory 12. Further, the program can be stored in a storage medium. The storage medium storing the program may be a non-transitory computer readable medium. The non-temporary storage medium is not particularly limited, but may be a storage medium such as a USB memory or a CD-ROM.

The storage unit 100 stores various criteria data used by the determination unit 102 to determine the presence or absence of an accident, and video data that is video captured by the imaging device 15.

The acquisition unit 101 has a function of acquiring acceleration data measured by the acceleration sensor 16 and vehicle speed data indicating the vehicle speed of the vehicle.

The determination unit 102 determines whether the acceleration and vehicle speed acquired by the acquisition unit 101 correspond to at least one of the determination criteria corresponding to each of the plurality of accident types included in the determination criterion data. It has the function of determining that an impact that should be recorded has occurred. More specifically, the determination unit 102 uses the acceleration and vehicle speed acquired by the acquisition unit 101 as a determination condition corresponding to a small accident (first accident type) and a determination condition corresponding to a medium accident (second accident type). If at least one of the conditions and the determination condition corresponding to a major accident (third accident type) is met, it is determined that an impact for which a video should be recorded has occurred.

A small accident is an accident where the impact on the vehicle is small, such as a collision between a car and a person, a collision at very low speed of approximately 10 km or less, or a driver suddenly braking even if it does not result in an actual collision. This assumes a situation where the vehicle is stopped. A medium accident is an accident in which the impact applied to the vehicle is medium, and is assumed to be an accident in which the speed at the time of collision is approximately 10 km to 20 km. A major accident is an accident at which an airbag is released, and is assumed to be an accident in which the speed at the time of collision is 20 km or more.

Note that the definitions of a small accident, a medium accident, and a large accident are merely examples, and the present embodiment is not limited thereto. In addition, the speed at the time of collision used when explaining the definitions of small, medium, and major accidents is for the convenience of explanation and is only used to make it easier to imagine the magnitude of the impact, and is limited to this. It is not something that will be done. This embodiment is not limited to the three-stage classification of small accidents, medium accidents, and major accidents. Accidents may be further classified into more types of accidents depending on the magnitude of the impact applied to the vehicle.

When the determining unit 102 determines that an impact for which video should be recorded has occurred, the recording unit 103 stores video data photographed by the photographing device 15 at times before and after the determined timing as recorded video data. 100.

<Processing procedure>
FIG. 4 is a flowchart illustrating an example of a processing procedure when the drive recorder 10 determines the presence or absence of an impact. While the drive recorder 10 is powered on, the determination unit 102 repeatedly performs the processing procedure from step S10 to step S18 shown in FIG. 4 to determine the presence or absence of an impact.

In step S10, the acquisition unit 101 acquires acceleration data. More specifically, the acquisition unit 101 acquires acceleration data in the front-back direction, left-right direction, and up-down direction measured by the acceleration sensor 16. Further, the acquisition unit 101 acquires the moving speed of the drive recorder 10 (i.e., the moving speed of the vehicle), which is calculated based on the temporal change in the position of the drive recorder 10 (i.e., the vehicle position) acquired by the GPS module. . Note that, when vehicle speed data output from the on-vehicle computer is input to the drive recorder 10, the acquisition unit 101 may acquire the input vehicle speed data. More accurate vehicle speed data can be obtained.

Note that the output value from the acceleration sensor 16 is an acceleration in the opposite direction to the acceleration actually applied to the drive recorder 10. For example, assume that the driver suddenly applies the brakes, causing a deceleration G of 0.6 G to be applied to the drive recorder 10. In this case, the acceleration sensor 16 outputs data indicating that an acceleration of 0.6G has occurred in the forward direction (X direction). In the following explanation, except for the explanation of the specific examples shown in FIGS. 5 and 6, acceleration and deceleration mean the acceleration and deceleration that occur in the drive recorder 10, not the output value from the acceleration sensor 16. shall be. Moreover, deceleration shall mean negative acceleration.

In step S11, the determination unit 102 determines whether the acquired acceleration matches the determination criteria for a small accident. If they match, the process advances to step S14; if they do not match, the process advances to step S12. Specifically, the determination unit 102 calculates a moving average value for a predetermined period (first period) regarding the magnitude of acceleration in the longitudinal direction, and determines that the calculated moving average value is larger than a predetermined threshold value (first threshold value), and If it is detected that the deceleration of the vehicle speed is equal to or higher than a predetermined deceleration (first deceleration), it is determined that the determination criterion corresponding to a small accident is satisfied.

FIG. 5A shows an example of the acceleration detected by the acceleration sensor 16 when the driver suddenly brakes and stops after sensing an accident. Further, B in FIG. 5 shows an example of the acceleration detected by the acceleration sensor 16 when the vehicle climbs over a step. The vertical axis indicates acceleration in the longitudinal direction, and the horizontal axis indicates time. Period P1 indicates a predetermined period (first period) for calculating the moving average value. Threshold P2 indicates a predetermined threshold (first threshold). Graphs AC1 and AC2 are longitudinal accelerations, and graphs MA1 and MA2 are moving average values of longitudinal accelerations. The predetermined period (first period) may be, for example, 0.5 seconds, but is not limited to this. Further, the predetermined threshold value (first threshold value) may be, for example, about 0.5 to 0.7G, but is not limited to this.

In the example of A in FIG. 5, the moving average value MA1 of the acceleration in the longitudinal direction exceeds the threshold value P2 at time t1. Therefore, the determination unit 102 determines at time t1 that the acceleration meets the determination criteria for a minor accident. On the other hand, in the example of B in FIG. 5, the moving average value MA2 of the acceleration in the longitudinal direction never exceeds the threshold value P2. Therefore, the determination unit 102 determines that the determination criteria for a minor accident are not met. Returning to FIG. 4, the explanation will be continued.

The determination unit 102 determines that the deceleration of the vehicle speed is equal to or less than a predetermined deceleration (first deceleration) in a predetermined time period (second period) before and after time t1 when the moving average value becomes larger than a predetermined threshold value (first threshold value). It may be determined whether or not the speed is greater than or equal to the speed. The predetermined time period (second period) may be, for example, 2 seconds or 3 seconds, but is not limited to this. Further, the determining unit 102 determines that the timing of the time t1 is the timing at which an impact for which video should be recorded has occurred, and instructs the recording unit 103 to record the video data before and after the timing. good.

As mentioned above, small accidents are assumed to be collisions between a car and a person, collisions at extremely low speeds, or situations in which the driver brakes suddenly and stops the vehicle even if it does not result in an accident. By detecting a small accident when the moving average value of the acceleration is a predetermined threshold (first threshold) and the deceleration is greater than or equal to the predetermined deceleration, minute vibrations on the road can be detected. This makes it possible to prevent erroneously determining that the accident is a minor accident.

Furthermore, by using deceleration rather than longitudinal acceleration to determine when the driver has applied sudden braking, it becomes possible to more accurately determine deceleration.

In step S12, the determination unit 102 determines whether the acceleration and vehicle speed data match the determination criteria for a medium accident. If they match, the process advances to step S14; if they do not match, the process advances to step S13. Specifically, the determination unit 102 totals the magnitude of the acceleration in the left-right direction and the magnitude of the acceleration in the longitudinal direction at the same time, and if the total value is larger than a predetermined threshold (second threshold), the determination unit 102 determines that the accident corresponds to a medium accident. It is determined that the determination conditions are met. The predetermined threshold value (second threshold value) may be, for example, about 2 to 4 G, but is not limited to this.

The determination unit 102 determines that the time t2 at which the total value is larger than a predetermined threshold (second threshold) is the timing at which an impact for which a video should be recorded has occurred, and the determination unit 102 determines that the timing t2, at which the total value becomes larger than a predetermined threshold (second threshold), is the timing at which an impact for which a video should be recorded has occurred, and the determination unit 102 sends information to the recording unit 103 about the timing before and after the timing. You may also instruct to record video data.

The criteria for determining medium-sized accidents is to combine accelerations in the left-right direction and front-back direction, and detect whether the combined value exceeds a certain value. This is because, unlike a small accident, in a medium accident, when vehicles come into contact with each other, acceleration increases instantaneously and immediately decreases.

In step S13, the determination unit 102 determines whether the acceleration and vehicle speed data match the criteria for determining a major accident. If they match, the process advances to step S14; if they do not match, the process advances to step S18. Specifically, the determination unit 102 determines that the sum of the maximum magnitude of acceleration in the longitudinal direction and the maximum magnitude of acceleration in the vertical direction is greater than a predetermined threshold (third threshold), and If the time when the maximum value of the magnitude of longitudinal acceleration is measured and the time when the maximum value of the magnitude of vertical acceleration is within a predetermined period (within the third period), It is determined that the determination conditions corresponding to an accident are satisfied.

FIGS. 6A and 6B show an example of the acceleration detected by the acceleration sensor 16 when a major accident occurs. The vertical axis of A in FIG. 6 indicates acceleration in the longitudinal direction, and the horizontal axis indicates time. The vertical axis of B in FIG. 6 indicates acceleration in the left-right direction, and the horizontal axis indicates time. Graph AC3 is the acceleration in the front-back direction, and graph AC4 is the moving average value of the acceleration in the left-right direction. The determination unit 102 determines that the sum of the maximum value g1 of acceleration in the longitudinal direction and the maximum value g2 of acceleration in the lateral direction is greater than a predetermined threshold (third threshold), and the maximum value g1 of acceleration in the longitudinal direction is measured. If the time t3 at which the measurement occurred and the time t4 at which the maximum value g2 of the left-right acceleration was measured exist within a predetermined period (within the third period), it is determined that the determination condition corresponding to a major accident is satisfied. The predetermined period (third period) may be, for example, 0.05 to 0.1 seconds, but is not limited to this. Further, the predetermined threshold value (third threshold value) may be, for example, about 6 to 8 G, but is not limited to this.

The criteria for major accidents allow not only the summation of acceleration values at the same time as in the criteria for medium accidents, but also the summation of acceleration values at different times. This is because the more serious the accident is, the shorter the time it takes for the impact to occur, and the more likely it is that there will be subtle shifts in the timing of the impact in the longitudinal and lateral directions. This is because it is difficult to accurately determine major accidents by simply doing so.

If a slight deviation occurs, it will not be possible to make an appropriate judgment using a method that combines instantaneous values as in the case of medium-sized accidents, but it is possible to sum up the maximum values of acceleration in the longitudinal and lateral directions, that is, the values of acceleration at different times. We are trying to solve this problem by allowing this.

In step S14, the acquisition unit 101 acquires information indicating whether the type of vehicle in which the drive recorder 10 is installed is a large vehicle. The type of vehicle in which the drive recorder 10 is installed may be a type set in advance by the user via a user interface or the like provided in the drive recorder 10 when installing the drive recorder 10 in the vehicle. Note that a large vehicle refers to a vehicle such as a truck, bus, trailer, etc., for example. If the type of vehicle is a large vehicle, the process proceeds to step S15, and if the vehicle is not a large vehicle, the process proceeds to step S16.

In step S15, when the vehicle type is a large vehicle, the determination unit 102 further determines whether the deceleration of the vehicle speed is equal to or higher than a predetermined deceleration (fourth deceleration). If the deceleration is greater than or equal to the predetermined deceleration, the process proceeds to step S16; if the deceleration is less than the predetermined deceleration, the process proceeds to step S18. The predetermined deceleration (fourth deceleration) may be the same value as the predetermined deceleration (first deceleration) explained in the judgment criteria for small accidents, or may be a different value. good.

In a large vehicle, there is a possibility that a large impact may be generated on the vehicle body due to vibrations caused by loading and unloading cargo or while driving due to loading heavy objects such as a vehicle, but by providing the processing procedure of step S15, The possibility of erroneous determination occurring in such cases can be suppressed.

In step S16, if the determination unit 102 determines that at least one of the supplementary conditions described below is met, the process proceeds to step S17, and if it is determined that all of the supplementary conditions are not met, The process may proceed to step S18. Alternatively, if the determination unit 102 determines that all of the additional rule conditions described below are met, the process proceeds to step S17, and if it is determined that at least one of the additional rule conditions is met, the determination unit 102 proceeds to the process of step S18. You may proceed to the procedure.

(Supplementary Condition 1)
The determination unit 102 may determine that an impact for which an image should be recorded has occurred when it is detected that the vehicle speed has become zero. The timing for determining whether the vehicle speed is zero or not is set, for example, after a predetermined period of time has elapsed (for example, 10 seconds or 15 seconds, etc.) from the timing at which it is determined that an impact for which an image should be recorded has occurred. Good too. This is because the vehicle usually stops when an accident occurs. In addition, if the vehicle speed is not zero at the relevant timing, that is, if the vehicle is running, it is considered that no accident has occurred, so even if it is determined that the impact does not require recording the video. good.

(Supplementary Condition 2)
FIG. 7 is a flowchart for explaining an example of the processing procedure for supplementary condition 2.

In step S20, the determining unit 102 determines whether the magnitude of the vertical acceleration is less than or equal to a predetermined threshold (fifth threshold). If it is less than or equal to the predetermined threshold, the process proceeds to step S22. If the predetermined threshold is exceeded, the process proceeds to step S21. The predetermined threshold value may be, for example, 0.1G, but is not limited to this.

In step S21, the determination unit 102 determines that if the magnitude of the acceleration in the vertical direction exceeds a predetermined threshold (fifth threshold), and the magnitude of the acceleration in the vertical direction is equal to the magnitude of the acceleration in the vertical direction, It is determined whether the total value of the magnitude of the acceleration in the vertical direction or the magnitude of the acceleration in the vertical direction and the magnitude of the acceleration in the longitudinal direction is less than or equal to a predetermined percentage. If the ratio is less than or equal to the predetermined ratio, the process proceeds to step S22. If the predetermined ratio is exceeded, the process proceeds to step S23. The predetermined ratio may be, for example, 2%, but is not limited to this.

In step S22, the determination unit 102 determines that an impact has been detected. In step S23, the determining unit 102 determines that no impact has been detected.

Basically, the higher the acceleration, the higher the possibility of an accident, but if there is a strong acceleration in the vertical direction compared to the acceleration in the left and right directions, it is assumed that the vehicle simply bounced up and down due to a bump, etc. This is for the purpose of By providing supplementary condition 2, it is possible to suppress the possibility that an erroneous determination will occur in such a case. Returning to FIG. 4, the explanation will be continued.

(Supplementary Condition 3)
The determination unit 102 further determines that if the total value of the horizontal acceleration, the longitudinal acceleration, and the vertical acceleration in the predetermined determination period is within a predetermined range (sixth range), It may be arranged so that it is not determined that an impact that should be recorded has occurred. The predetermined determination period may be, for example, from two minutes ago to the current time, but is not limited to this. Further, the predetermined range (sixth range) is a range from the acceleration normally measured when the drive recorder 10 is correctly installed to the acceleration measured when the drive recorder 10 is about to peel off from the windshield. It is desirable to set it within a range.

Among the cases where the drive recorder 10 comes off the windshield and falls, in cases where the drive recorder 10 falls unrelated to an accident, the adhesive begins to peel off even before the fall, and the drive recorder 10 sways for a long time. There are many. Therefore, by applying supplementary condition 3, it is possible to suppress false detections due to poor attachment of the drive recorder 10.

<Modified example>
Some of the processing steps described above using FIG. 4 may be skipped. For example, steps S14 to S16 may be omitted. In this case, if it is determined that they match in the processing procedure of step S11, step S12, or step S13, the processing procedure may proceed to step S17.

Further, for example, the processing procedure of step S16 may be omitted. In this case, if it is determined in the processing procedure of step S14 that the vehicle is not a large vehicle, and if it is determined that the speed has suddenly decreased in the processing procedure of step S15, the process proceeds to step S17. good.

Furthermore, for example, the processing procedures of step S14 and step S15 may be omitted. In this case, if it is determined that they match in the processing procedure of step S11, step S12, or step S13, the processing procedure may proceed to step S16.

Furthermore, the various threshold values and periods used by the determination unit 102 to determine the presence or absence of an impact may be different set values depending on the type of vehicle. For example, the various threshold values and periods may be set to different values depending on whether the vehicle is a passenger car or a large vehicle.

In addition, the criteria for the above-mentioned medium-sized accidents should be the same judgment logic as the judgment criteria for large-scale accidents, and the predetermined threshold value and predetermined period should be set to different values for medium-sized accidents and large-scale accidents. It's okay.

Furthermore, after the processing procedure of step S11-NO, after the processing procedure of step S12-NO, or after the processing procedure of step S13-NO, the determination unit 102 further determines the value of the threshold under the condition of a small accident. It may be determined whether or not both the condition in which the threshold value is changed to a small value and the condition in which the threshold value is changed to a small value in the medium accident condition are met.

Specifically, the determination unit 102 calculates a moving average value for a predetermined period (first period) regarding the magnitude of acceleration in the longitudinal direction, and determines whether the calculated moving average value is a predetermined threshold value (a value smaller than the first threshold value). (a certain sixth threshold) and the deceleration of the vehicle speed is greater than or equal to a predetermined deceleration (first deceleration), and the magnitude of the acceleration in the left-right direction and the magnitude of the acceleration in the longitudinal direction at the same time. It is determined whether or not the total value is greater than a predetermined threshold (a seventh threshold that is smaller than the second threshold). If both conditions are satisfied, the determining unit 102 proceeds to the processing procedure of step S14, and if either condition is not satisfied, the determining unit 102 proceeds to the processing procedure of step S18. This makes it possible to record video in the case of a light contact after sudden braking.

<Summary>
According to the embodiment described above, the drive recorder 10 should record a video when acceleration and vehicle speed meet at least one of the criteria corresponding to each of a plurality of accident types. It is now determined that a shock has occurred. This makes it possible to provide a technique that enables more accurate detection of the occurrence of an impact for which an image should be recorded.

In addition, even if it is determined that the accident falls under a minor accident, medium accident, or major accident, it is further determined whether the conditions of the supplementary regulations are met. As a result, it is possible to prevent cases where the vehicle bounces up and down due to a difference in level or false judgments due to improper installation of the drive recorder 10, and it is possible to detect with even higher precision whether or not an impact has occurred that should record an image. become.

Furthermore, when the type of vehicle is a large vehicle, it is determined whether the vehicle has suddenly decelerated. This makes it possible to prevent erroneous determinations caused by vibrations and shocks that are typical of large vehicles, and to detect with even higher precision whether or not an impact for which an image should be recorded has occurred.

The embodiments described above are intended to facilitate understanding of the present invention, and are not intended to be interpreted as limiting the present invention. The flowcharts, sequences, and elements included in the embodiments, as well as their arrangement, materials, conditions, shapes, sizes, etc., described in the embodiments are not limited to those illustrated and can be changed as appropriate. Further, it is possible to partially replace or combine the structures shown in different embodiments.

10...Drive recorder, 11...Processor, 12...Memory, 13...Input device, 14...Output device, 15...Photographing device, 16...Acceleration sensor, 17...GPS module, 18...Storage medium, 100...Storage unit, 101... Acquisition unit, 102... Judgment unit, 103... Recording unit

Claims (1)

an acceleration data acquisition unit that acquires acceleration data indicating the acceleration of the vehicle;
The sum of the maximum value of the magnitude of the acceleration in the longitudinal direction acquired by the acceleration data acquisition unit and the maximum value of the magnitude of the acceleration in the vertical direction acquired by the acceleration data acquisition unit is greater than a predetermined threshold value. , and when the time when the maximum value of the magnitude of the acceleration in the longitudinal direction is measured and the time when the maximum value of the magnitude of the acceleration in the vertical direction is measured within a predetermined period, the video is displayed. a recording section for recording;
A recording device comprising:

Images