JP6141148B2 - Time series recording data analyzer - Google Patents

Description

  The present invention relates to a time-series recording data analysis apparatus used for analyzing time-series recording data recorded by an on-vehicle device such as a vehicle drive recorder.

  Japanese Patent Application Laid-Open No. 2004-151867 discloses a conventional technique related to a vehicle drive recorder and an accident analysis simulation apparatus for analyzing time-series recorded data recorded by the drive recorder.

  As disclosed in Patent Document 1, this type of drive recorder automatically records time-series data in which various information such as date / time, camera image, sound, vehicle speed, and own vehicle GPS information are associated with each other. Can do. In addition, the accident analysis simulation apparatus can provide the user with information useful for analyzing the cause of the accident by analyzing the time-series recording data recorded by the drive recorder and displaying the situation at the time of the accident on the screen, for example.

JP 2009-83815 A

  By the way, when trying to analyze time-series recording data recorded by a drive recorder using an analysis device in an office or the like, a large number of still images and moving images photographed by a camera are reproduced on the screen according to the photographing time. To do. In addition, various information obtained at the same time, for example, vehicle speed, acceleration, brake pressure, and the like are displayed in a superimposed state together with the image to be reproduced. As a result, the analyst can accurately grasp the situation of the vehicle and the surrounding situation such as the road at the corresponding time.

  However, there may be a time lag between the image reproduced on the screen and the vehicle speed value displayed at the same time. For example, even though the vehicle has already started moving in the image being reproduced, the displayed vehicle speed remains 0 km / h, or the vehicle is already stopped in the image being reproduced. Regardless, a situation occurs in which the displayed vehicle speed is, for example, 10 km / h. In such a situation, the reliability of the data being analyzed can be suspected, making it difficult to analyze the cause of the accident.

  When displaying the general vehicle speed in a vehicle, the vehicle speed is grasped by measuring the vehicle speed pulse output from the vehicle speed sensor. However, in situations where it is necessary to analyze the traveling state of the vehicle, it must be assumed that slip occurs between the wheels and the road surface. In this case, it is necessary to avoid calculating the vehicle speed by relying only on the output signal of the vehicle speed sensor.

  Based on such a situation, a drive recorder that requires reliability has a function of grasping the vehicle speed based on information other than the vehicle speed sensor. Specifically, the vehicle speed is acquired by integrating the acceleration detected by the acceleration sensor installed on the vehicle. Further, based on signals received from a plurality of GPS (Global Positioning System) satellites, the latitude / longitude of the vehicle position is calculated and the vehicle speed is calculated.

  However, when calculating the vehicle speed based on the acceleration detected by the acceleration sensor, the acceleration of the vehicle immediately after the start of travel can be accurately calculated, but a slight detection error or calculation error occurs after a certain amount of travel time has elapsed after the start of travel. Will accumulate and increase due to integration, so that the acceleration accuracy of the vehicle will be low. On the other hand, when calculating the vehicle speed using the GPS signal, there may be a delay in the processing of the received signal, the calculation process, the information transfer, etc., and the actual vehicle speed acquired from the GPS receiver by the main body of the drive recorder There may be a time lag between the vehicle speed and the vehicle speed. In particular, when the vehicle speed is calculated using GPS signals, satellite measurement data cannot be obtained continuously, so there is a problem that the time interval required to obtain the latest vehicle speed becomes relatively long.

  Accordingly, when analyzing the vehicle speed calculated by integrating the acceleration as described above or the data recorded with the camera image of the vehicle speed information calculated based on the GPS signal, it is reproduced on the screen. There may be a time lag between the image and the simultaneously displayed vehicle speed value.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to eliminate a time lag between an image reproduced on a screen and a vehicle speed value displayed at the same time, and An object of the present invention is to provide a time-series recording data analysis apparatus capable of reducing errors.

In order to achieve the above-described object, a time-series recording data analysis apparatus according to the present invention is characterized by the following (1) to (4).
(1) A time-series recording data analyzing apparatus that reproduces time-series recording data in which information related to at least an image and a vehicle speed is recorded in a state associated with time,
First speed information calculated based on signals received from a plurality of satellites included in the information related to the vehicle speed, and second calculated based on acceleration detected in the vehicle included in the information related to the vehicle speed. Each with the associated time,
A first time point when the first speed information is in a state satisfying a vehicle start condition, and a second time point at which the second speed information matches the value of the first speed information at the first time point. And a time point between the first time point and the second time point is calculated.
For the first speed information whose associated time is after the first time point, a correction for advancing the associated time by the time difference is performed.
about.
(2) A time-series recording data analysis apparatus configured as described in (1) above,
A value obtained by subtracting a predetermined value from the speed value of the first speed information at the first time point is corrected as a value of the first speed information at the first time point;
about.
(3) A time-series recording data analysis apparatus configured as described in (1) or (2) above,
When information related to acceleration is recorded in the time-series recording data in a state associated with time, the acceleration is based on the information related to the acceleration until the time when the speed value of the second speed information starts to show an increasing tendency. Calculate the correction amount,
A value obtained by subtracting the information related to the acceleration by the acceleration correction amount is set as an acceleration after correction, and the second acceleration information is obtained by calculating the acceleration after correction.
about.
(4) A time-series recording data analysis apparatus having any one of the above-described (1) to (3),
A third time point at which the second speed information is in a state satisfying the vehicle travel stop condition, a fourth time point at which the first speed information is in a state satisfying the vehicle start condition, and the second time point. Identifying a fifth time point at which the speed information matches the value of the first speed information at the fourth time point, and calculating a time difference between the fourth time point and the fifth time point,
For the first speed information whose associated time is after the third time point, a correction for advancing the associated time by the time difference is performed.
about.

According to the time-series recording data analysis apparatus having the configuration (1), the delay time related to the first speed information is detected as the time difference, and the time difference is corrected. The time lag between the two can be eliminated. Further, for the short-term vehicle speed at the timing when the first speed information cannot be obtained, it is not necessary to consider the effect of error accumulation, so that the second speed information is used without causing a large error. Can be displayed.
According to the time-series recording data analysis apparatus configured as described in (2) above, the time difference is calculated by taking into account a numerical error between the first speed information and the second speed information based on the predetermined value a. can do. Therefore, it is possible to limit the error in the value of the corrected first speed information within an allowable range.
According to the time-series recorded data analysis apparatus having the configuration (3), the influence of gravity acceleration can be corrected by the acceleration correction amount. That is, when the vehicle is on a sloping road surface such as a hill, it is affected by the gravitational acceleration, and thus there may be an error in the second speed information calculated from the detected acceleration. This error can be corrected correctly.
According to the time-series recording data analysis apparatus having the configuration (4), the delay time related to the first speed information is detected as the time difference each time a stop state of the vehicle is detected, and the time difference is corrected. A time lag between the first speed information and the displayed image can be eliminated.

  According to the time-series recording data analysis apparatus of the present invention, it is possible to eliminate a time lag between an image reproduced on a screen and a vehicle speed value displayed at the same time, and to reduce an error in a numerical value of the vehicle speed. It becomes possible.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 is a flowchart showing an operation example (1) of the time-series recording data analysis apparatus. FIG. 2 is a schematic diagram illustrating a configuration example of time-series recording data. FIG. 3 is a time chart showing a specific change example (1) of two types of speeds corresponding to the contents of the time-series recording data. FIG. 4 is a time chart showing a specific change example (2) of two types of speeds corresponding to the contents of the time-series recording data. FIG. 5 is a flowchart showing an operation example (2) of the time-series recording data analysis apparatus. FIG. 6 is a flowchart showing an operation example (3) of the time-series recording data analysis apparatus. FIG. 7 is a block diagram illustrating a configuration example of the drive recorder.

  Specific embodiments relating to the time-series recording data analysis apparatus of the present invention will be described below with reference to the drawings.

<Overview of overall system>
A time-series recording data analysis apparatus according to an embodiment of the present invention reads and processes time-series recording data recorded by a vehicle drive recorder from, for example, a predetermined recording medium, and displays information useful for analyzing traffic accidents and the like. It is a device for outputting above.

<Configuration of time-series recording data analyzer>
The time-series recording data analysis apparatus of the present embodiment can be configured using a highly versatile processing apparatus such as a general personal computer. That is, a time series recording data analyzing apparatus can be configured by incorporating a special application program for reading and analyzing time series recording data in a personal computer. Typical components for configuring the time-series recording data analysis apparatus include a computer main body (CPU), a display, a card reader for reading data from a recording medium, basic software (OS), an application program, and the like.

<Configuration and operation of drive recorder>
The time-series recording data to be processed by the time-series recording data analysis apparatus is automatically recorded during the operation of the vehicle, for example, by a drive recorder having the configuration shown in FIG.

  For example, the drive recorder 20 shown in FIG. 7 includes a microcomputer (CPU) 21, a vehicle-mounted camera 22, an acceleration (G) sensor 23, a GPS receiver 24, a recording medium 25, and a memory (SDRAM) 26. The recording medium 25 is composed of, for example, a flash memory so that data can be held without supplying power.

  The in-vehicle camera 22 can shoot continuously or intermittently a landscape in front of the traveling direction of the vehicle and output a video signal. The acceleration sensor 23 can detect accelerations in three axial directions applied to the vehicle. The GPS receiver 24 outputs position information (latitude / longitude) indicating the current position of the vehicle, the moving speed of the vehicle, the current time, and the like based on signals received from a plurality of GPS (Global Positioning System) satellites. can do.

  The microcomputer 21 controls the entire drive recorder 20 by executing a program incorporated in advance. Specifically, the following operation is performed.

(1) Images obtained by shooting by the in-vehicle camera 22 are sequentially recorded on the recording medium 25 in association with shooting times as a collection of a number of still images or moving image data.
(2) The acceleration detected by the acceleration sensor 23 is repeatedly captured at a constant time interval, and sequentially recorded on the recording medium 25 in association with time as time-series acceleration data Dg.
(3) Information such as the current position of the vehicle, the speed of the vehicle, and time is periodically fetched from the GPS receiver 24, and necessary information among these pieces of information is sequentially recorded on the recording medium 25.

  Since the GPS receiver 24 cannot continuously acquire a signal from the satellite, the period in which the microcomputer 21 captures information from the GPS receiver 24 is longer than the period in which the acceleration data Dg is captured.

<Configuration example of time-series recording data>
A configuration example of time-series recording data is shown in FIG. For example, when a vehicle equipped with the drive recorder 20 shown in FIG. 7 is operated, the time series recording data including the configuration shown in FIG. 2 can be automatically recorded on the recording medium 25 by the drive recorder 20. . Actually, in addition to the time-series recording data shown in FIG. 2, a set of still images or a moving image is simultaneously recorded on the recording medium 25. Further, all data on the recording medium 25 can be associated with each other by time or relative time.

  The time-series recording data shown in FIG. 2 includes time t, GPS speed data Vgps, and acceleration data Dg. The GPS speed data Vgps is speed data obtained at the output of the GPS receiver 24 shown in FIG. 7, for example. The acceleration data Dg is data representing the acceleration detected by the acceleration sensor 23 shown in FIG. 7, for example.

  The acceleration detected by the acceleration sensor 23 can be acquired almost continuously by sampling repeatedly in a short time period. Therefore, the acceleration data Dg shown in FIG. 2 is recorded for each of the times t0001, t0002, t0003, t0004, t0005, t0006,. On the other hand, since the period for acquiring the GPS speed data Vgps is longer than the period for acquiring the acceleration data Dg, only at intermittent timings such as the times t0001, t0004, t0007, t0010,... Shown in FIG. GPS speed data Vgps is recorded.

<General data analysis method>
For example, by bringing the recording medium 25 removed from the drive recorder 20 to an office or the like and reading the recording contents of the recording medium 25 with a time-series recording data analysis device, information useful for analysis such as a traffic accident can be obtained. That is, by displaying the recorded images on the screen according to the order of the recording times, it is possible to accurately grasp the situation of the actual road and other vehicles from the contents of the images at each time point. In addition, since information such as time, the speed of the own vehicle, and acceleration can be displayed on the screen simultaneously with the image, the situation of the own vehicle can also be grasped.

<Explanation of speed and time lag>
For example, when reading the time-series recording data having the configuration shown in FIG. 2 and reproducing and analyzing it with the time-series recording data analyzing apparatus, the numerical value of the acceleration data Dg is integrated to obtain the vehicle speed Vg at each time. Can be calculated. Further, when the time series recording data having the configuration shown in FIG. 2 is used, the vehicle speed can be grasped using the GPS speed data Vgps.

  However, if integration is repeated over a long period of time, even a slight acceleration measurement error is accumulated and a relatively large error occurs in the speed Vg. Therefore, the accurate speed can be grasped over a long time only by the speed Vg. I can't.

  On the other hand, for the GPS speed data Vgps, there is a possibility that the time and the speed are relatively shifted. That is, a certain amount of time is required for the GPS receiver 24 to perform signal processing after the signal from the satellite is received and to perform complicated calculations. Furthermore, the GPS receiver 24 and the microcomputer (CPU) 21 It takes time to exchange data between them. For this reason, the timing at which the microcomputer 21 acquires the GPS speed data Vgps is delayed by a certain amount of time from the timing at which Vgps is measured.

  FIG. 3 shows a specific change example (1) of two types of speeds corresponding to the contents of the time-series recording data. That is, FIG. 3 shows an example of changes in the aforementioned speed Vg and GPS speed data Vgps. In FIG. 3, the horizontal axis represents the elapsed time (× 0.1 second) from the recording time of the first data, and the vertical axis represents the vehicle speed (km / h).

  In the content of FIG. 3, the speed Vg is approximately 0 km / h between time 0 and t2, and tends to increase from the vicinity of time t2 to thereafter. Further, the value (speed) of the GPS speed data Vgps is 0 km / h between time 0 and t1, and when reaching time t1, it changes in a stepwise manner to a value of about 2 km / h.

  Since the GPS speed data Vgps has a long numerical value update interval (cycle), it changes in steps as shown in FIG. In FIG. 3, when the numerical value of Vgps changes, the largest reason why the numerical value of Vgps and the speed Vg do not match is the influence of the delay time of Vgps. That is, the GPS speed data Vgps is recorded at a time when a certain amount of time has elapsed since the GPS receiver 24 measured Vgps.

  Therefore, when the time-series recording data is read using the above-described time-series recording data analyzing apparatus and the image and the vehicle speed are displayed simultaneously, if the value of the GPS speed data Vgps is displayed as it is as the vehicle speed, the vehicle speed is simply stepped. In addition to the change in the shape, a timing shift occurs between the vehicle speed value displayed simultaneously with the speed of the host vehicle appearing in the image. On the other hand, when the speed Vg calculated from the acceleration is displayed, there is no timing shift and a smooth change in the vehicle speed can be reproduced. However, when displaying the speed Vg, the error of the displayed speed increases as time elapses.

<Characteristic operation of time-series recording data analyzer>
<Example of operation of time-series recording data analysis apparatus (1)>
FIG. 1 shows an operation example (1) of the time-series recording data analysis apparatus. That is, when the time series recording data 11 recorded by the drive recorder 20 as shown in FIG. 2 is read and analyzed by the time series recording data analysis apparatus, the time series recording data analysis apparatus executes the operation shown in FIG. To do.

  In step S11 of FIG. 1, the time-series recording data analysis apparatus reads the time-series recording data 11 from the recording medium 25, and refers to each data in order according to the recording time t associated with the data. If the GPS speed data Vgps is included as in the time-series recording data 11 shown in FIG. 2, the process proceeds from the next step S12 to S13. If the GPS speed data Vgps is not included, there is a concern about the effect of the accumulated error, so the processing is terminated as it is.

  In step S13, the time-series recording data analysis apparatus refers to the GPS velocity data Vgps in the time-series recording data 11, and searches for a time t1 that first satisfies the condition “Vgps> 0 km / h”. This time t1 is a time when it can be considered that the vehicle has started traveling. However, since the GPS speed data Vgps is affected by the delay time, there is a difference between the time when the vehicle actually starts traveling and the time t1. If the time t1 can be detected in S13, the process proceeds from the next S14 to S15, and if it cannot be detected, the process ends.

  In step S15, the content of the GPS speed data Vgps at time t1 is determined as the speed y1. That is, the value of Vgps when the vehicle starts to travel becomes the speed y1 (see FIG. 3).

  In step S16, the time-series recording data analyzing apparatus performs a time t2 that is a changing point of acceleration (acceleration in the front-rear direction of the vehicle) data Dg within a time axis range of 0 to t1 of the data in the time-series recording data 11. Search for. Specifically, the time t2 at which the speed Vg calculated by integrating the acceleration data Dg starts to change from a stopped state to an upward trend is defined as a time t2 that is a change point (see FIG. 3).

  In step S19, the time-series recording data analysis device calculates the velocity Vg at the time of interest at present by integrating the product of the acceleration in the longitudinal direction of the acceleration data Dg in the time-series recording data 11 and the measurement interval. To do. The position where the integration is started is the time when the acceleration in the front-rear direction continuously increases or decreases. Then, it is identified in the next S20 whether or not the condition of “Vg ≧ (y1-a)” is satisfied. That is, a search is made for a timing at which the speed y1 at the start of vehicle travel in the GPS speed data Vgps matches Vg. Here, the predetermined value “a” is a constant that defines an allowable range related to a speed error. If the condition of “Vg ≧ (y1-a)” is not satisfied, the process proceeds to S21, and if the condition is satisfied, the process proceeds to S23.

  In step S21, the process proceeds to data processing at the next time. That is, the time of interest in step S19 is changed little by little from time t1 to time t2 shown in FIG. However, when the data processing for the upper limit “n seconds: for example 10 seconds” is completed, the processing in FIG. 1 is terminated.

  In step S23, the time-series recording data analyzing apparatus detects a time difference between time t3 that first satisfies the condition of S20 and time t1 as a delay time Td (see FIG. 3). That is, it is recognized that the time t1 when the start of the vehicle is detected based on the GPS speed data Vgps is shifted by the delay time Td from the time t3 that is the actual start of travel.

  In step S24, the time-series recording data analysis device corrects the GPS velocity data Vgps using the delay time Td detected in S23. That is, the GPS speed data Vgps at each time is moved forward by the delay time Td with respect to the position of the time axis. Regarding this correction, the GPS speed data Vgps on the recording medium 25 may be overwritten with the corrected data, or the new corrected GPS speed data Vgps is stored in a location different from the recording medium 25. May be.

  A specific example of the relationship between the velocity Vg calculated from the acceleration data Dg and the corrected GPS velocity data Vgp 'is shown in FIG. In the contents shown in FIG. 4, since the GPS speed data Vgp 'is moved forward by the delay time Td with respect to the data before correction, for example, at time t3, the speed Vg and the GPS speed data Vgp' are The values are almost the same.

  In step S25, the time-series recording data analysis apparatus displays the vehicle speed Vc (shown by a dotted line in FIG. 4) at each time on the screen using the GPS speed data Vgps ′ corrected in S24. . The vehicle speed Vc to be displayed is set to “0 km / h” because the vehicle is in a stop state within the range of time 0 to t2. For the vehicle speed Vc within the range of time t2 to t3, the speed Vg at each time is selected. Further, for the vehicle speed Vc after time t3, the corrected GPS speed data Vgp 'at each time is selected.

  When displaying such a vehicle speed Vc, as shown in FIG. 4, since the GPS speed data Vgps' has been corrected for the delay time Td, there is a time between the displayed image content and the vehicle speed. No shift occurs.

<Example of operation of time-series recording data analysis apparatus (2)>
FIG. 5 shows an operation example (2) of the time-series recording data analysis apparatus. The content shown in FIG. 5 is a modified example of the operation of FIG. 1 already described, and steps S17 and S18 shown in FIG. 5 are added. The contents of each changed step will be described below.

  In step S17, the time-series recording data analysis device calculates the gravitational acceleration correction value b based on the acceleration data Dg in the range of time 0 to t2 on the time axis. In the next step S18, the acceleration data Dg is subtracted by the gravitational acceleration correction value b calculated in S17. In the next step S19B, the speed Vg is calculated by integrating the acceleration data Dg2 corrected in S18. The contents of the other steps are the same as in FIG.

  When the vehicle travels on a horizontal road surface, the moving speed of the vehicle can be correctly calculated by integrating the horizontal acceleration detected by the acceleration sensor 23. On the other hand, when the vehicle travels on a sloping road surface such as a slope, it is affected by gravitational acceleration, so that a large error occurs in the calculated speed only by accumulating the acceleration normally. In order to reduce this error, the gravitational acceleration correction value b is obtained in step S17 shown in FIG. 5, and the acceleration data Dg is corrected in step S18.

  Within the range of time 0 to t2 shown in FIG. 3 and FIG. 4, the vehicle is stopped, that is, the vehicle speed is 0 km / h. Therefore, the information included in the acceleration data Dg is strongly influenced by the gravitational acceleration in a state within the range of time 0 to t2. Therefore, the gravitational acceleration correction value b is obtained from the average value of the acceleration data Dg within the range of time 0 to t2.

<Example of operation of time-series recording data analysis apparatus (3)>
FIG. 6 shows an operation example (3) of the time-series recording data analysis apparatus. The content shown in FIG. 6 is a modified example of the operation of FIG. 5 already described. Steps S18B and S24B shown in FIG. 6 are changed, and steps S31 to S37 are added.

  In the operation example of FIG. 6, when the time series recording data 11 includes a plurality of sections where the vehicle has stopped, the gravity acceleration correction value b is changed so as to be repeatedly obtained. The contents of each changed step will be described below.

  In step S18B of FIG. 6, the acceleration data Dg is corrected by the gravitational acceleration correction value b calculated in S17. However, the section in which the acceleration data Dg is corrected is from time 0 to time t4 when the movement stop of the vehicle is detected after time t1. The time t4 at which the stop of the movement of the vehicle is detected can be detected as a point in time when the speed Vg becomes approximately 0 km / h.

  In step S24B, the time-series recording data analysis device corrects the GPS velocity data Vgps using the delay time Td detected in S23. However, the section in which the GPS speed data Vgps is corrected is from time 0 to time t4 when the stop of movement of the vehicle is detected after time t1. The time t4 at which the stop of the movement of the vehicle is detected can be detected as a point in time when the speed Vg becomes approximately 0 km / h.

  In step S31, the time-series recording data analysis device searches for the time t4 when the vehicle started to stop next in the data after the time t1. That is, the time point at which the speed Vg becomes approximately 0 km / h after time t1 is detected as time t4.

  In step S32, the time-series recording data analysis device refers to the GPS velocity data Vgps in the time-series recording data 11, and searches for a time t5 that first satisfies the condition “Vgps> 0 km / h” after time t4. To do. This time t5 is a time when it can be considered that the vehicle has started traveling. However, since the GPS speed data Vgps is affected by the delay time, there is a difference between the time when the vehicle actually starts traveling and the time t5.

  In step S33, the time-series recording data analysis device searches for a time t6 at which the next running starts from the data from time t4 to time t5. Specifically, similarly to the time t2 shown in FIG. 3, the time t6 is detected as a point in time when the velocity Vg calculated from the acceleration data Dg changes from a state of approximately 0 km / h to an upward tendency.

  In step S34, the time-series recording data analysis apparatus calculates the latest gravitational acceleration correction value b based on the acceleration data Dg within the range of time t4 to t6, which is a section in which the vehicle is stopped.

  In step S35, the time-series recording data analyzing apparatus detects a new delay time Td by applying the processing equivalent to S13 to S23 described above to the data after time t4 in the time-series recording data 11. Specifically, in S13 to S23 described above, a process in which time 0 is replaced with time t4, time t1 is replaced with time t5, and time t2 is replaced with time t6 is performed in S34. As a result, at time t3 A corresponding time t7 is calculated.

  In step S36, the time-series recording data analysis apparatus corrects the GPS speed data Vgps using the delay time Td (t5-t7) detected in S35. However, the section in which the GPS speed data Vgps is corrected is from the time t4 to the time when the next vehicle movement stop is detected. The time when the movement stop of the vehicle is detected can be detected as the time when the speed Vg becomes approximately 0 km / h.

  In step S <b> 37, the time-series recording data analysis apparatus identifies whether all processing has been completed up to the last data of the time-series recording data 11. If the process is not completed, the process returns to S31. If the process is completed, the process proceeds to S25.

  Therefore, by repeating the processing of steps S31 to S37, every time the stop state of the vehicle is detected, the latest gravitational acceleration correction value b is detected in S34, the delay time Td is detected in S35, and the GPS speed data Vgps is detected. The latest delay time Td is used for correction.

  By repeating the detection of the gravitational acceleration correction value b and the detection of the delay time Td a plurality of times by the process as shown in FIG. 6, it is possible to suppress the occurrence of an error, for example, with respect to various slope conditions of the road surface. Become.

<Possibility of deformation>
In addition, about each time t1, t2, t3 demonstrated in the said embodiment, you may manage as relative time information with respect to a certain reference time instead of time. When the data recording cycle is constant, if at least one reference time is recorded in the recording medium 25, the time corresponding to each data is determined based on the position of each data and the recorded memory address. It can also be grasped.

  In addition, with respect to the drive recorder 20 that generates time-series recording data, it is possible to acquire information on the position and speed of the vehicle by receiving a signal transmitted by an equivalent satellite or the like, not limited to GPS, by the GPS receiver 24. It is.

Here, the features of the above-described embodiment of the time-series recording data analysis apparatus according to the present invention are summarized and listed in the following [1] to [4], respectively.
[1] A time-series recording data analyzing apparatus that reproduces time-series recording data (11) in which information relating to at least an image and a vehicle speed is recorded in a state associated with time,
Based on first speed information (Vgps) calculated based on signals received from a plurality of satellites included in the information related to the vehicle speed, and acceleration (Dg) detected in the vehicle included in the information related to the vehicle speed. And the second velocity information (Vg) calculated in the above, respectively, together with the associated time,
The first time point (t1) when the first speed information (Vgps) satisfies the condition for satisfying the vehicle start condition, and the second speed information (Vg) is the first time point (t1) at the first time point (t1). The second time point (t3) that matches the value of the speed information (Vgps) 1 is specified, and the time difference (Td) between the first time point (t1) and the second time point (t3) is calculated. And
A correction is made to advance the associated time by the time difference (Td) for the first speed information (Vgps) whose associated time is after the first time point (t1).
A time-series recording data analysis apparatus characterized by the above.
[2] A value obtained by subtracting a predetermined value (a) from the speed value of the first speed information (Vgps) at the first time point (t1) is the first value at the first time point (t1). Correct as the value of speed information (Vgps),
The time-series recording data analysis apparatus according to [1], wherein
[3] When information related to acceleration (Dg) is recorded in the time-series recording data (11) in a state associated with time, the speed value of the second speed information (Vg) shows an increasing tendency. Calculating the acceleration correction amount (b) based on the information on the acceleration (Dg) until the start time,
A value obtained by subtracting the information related to the acceleration (Dg) by the acceleration correction amount (b) is used as the corrected acceleration (Dg2), and the corrected acceleration (Dg2) is integrated and calculated, whereby the second speed information (Vg) is acquired,
The time-series recording data analysis apparatus according to [1] or [2], wherein
[4] A third time point (t4) when the second speed information (Vg) satisfies the vehicle travel stop condition, and the first speed information (Vgps) satisfies the vehicle start condition. And the fifth time point (t7) when the second speed information (Vg) matches the value of the first speed information (Vgps) at the fourth time point (t5). ) And calculating a time difference (Td) between the fourth time point and the fifth time point,
A correction is made to advance the associated time by the time difference (Td) for the first speed information (Vgps) whose associated time is after the third time point (t4).
The time-series recording data analysis apparatus according to any one of [1] to [3].

11 Time series recording data Dg Acceleration data Dg2 Dg after correction
Vgps GPS speed data Vgps' corrected Vgps
Vg speed (calculated by integrating Dg)
t1 Time when the vehicle movement start is detected from the GPS speed data Vgps t2 Time when the Vg starts to change in an upward trend t3 Time when the two types of speeds Vg and Vgp coincide with each other within an allowable range Td Delay time a Constant b Gravity Acceleration correction value y1 Numerical value of GPS speed data Vgps at the start of vehicle movement 20 Drive recorder 21 Microcomputer (CPU)
22 On-vehicle camera 23 Acceleration sensor 24 GPS receiver 25 Recording medium 26 Memory (SDRAM)

Claims (4)

A time-series recording data analysis device that reproduces time-series recording data recorded in a state in which at least information about an image and a vehicle speed is associated with time,
First speed information calculated based on signals received from a plurality of satellites included in the information related to the vehicle speed, and second calculated based on acceleration detected in the vehicle included in the information related to the vehicle speed. Each with the associated time,
A first time point when the first speed information is in a state satisfying a vehicle start condition, and a second time point at which the second speed information matches the value of the first speed information at the first time point. And a time point between the first time point and the second time point is calculated.
For the first speed information whose associated time is after the first time point, a correction for advancing the associated time by the time difference is performed.
A time-series recording data analysis apparatus characterized by the above. A value obtained by subtracting a predetermined value from the speed value of the first speed information at the first time point is corrected as a value of the first speed information at the first time point;
The time-series recording data analysis apparatus according to claim 1, wherein: When information related to acceleration is recorded in the time-series recording data in a state associated with time, the acceleration is based on the information related to the acceleration until the time when the speed value of the second speed information starts to show an increasing tendency. Calculate the correction amount,
A value obtained by subtracting the information related to the acceleration by the acceleration correction amount is set as an acceleration after correction, and the second acceleration information is obtained by calculating the acceleration after correction.
The time-series recording data analysis apparatus according to claim 1 or 2, wherein A third time point at which the second speed information is in a state satisfying the vehicle travel stop condition, a fourth time point at which the first speed information is in a state satisfying the vehicle start condition, and the second time point. Identifying a fifth time point at which the speed information matches the value of the first speed information at the fourth time point, and calculating a time difference between the fourth time point and the fifth time point,
For the first speed information whose associated time is after the third time point, a correction for advancing the associated time by the time difference is performed.
4. A time-series recording data analysis apparatus according to claim 1, wherein

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