JP2013218451A - Time series information analyzer and program for time series information analysis - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for converting multiple pieces of time series information into information for a space region and integrally analyzing it.SOLUTION: A time series information analyzer comprises: a sample value extraction part 1 that repeatedly applies processing of extracting sample values at the mutually same time point as a set from each of multiple pieces of time series information, to multiple time points; a time-space conversion part 2 that converts multiple pieces of time series information into space region information by repeatedly applying processing of plotting each of multiple sample values extracted as a set as a value of multiple axes in a space region, to the set of sample values extracted for the multiple time points; and an information output part 3 that outputs the space region information. As a result of converting multiple pieces of time series information into one piece of space region information and outputting the converted information, the analyzer uses the output space region information to realize an integral analysis of the multiple pieces of time series information.

Description

  The present invention relates to a time-series information analysis apparatus and a time-series information analysis program, and is particularly suitable for use in an apparatus that analyzes time-series information obtained by repeatedly observing temporal changes of a certain phenomenon. .

  Conventionally, various techniques for analyzing time-series information have been provided. Typical techniques for analyzing time series information include autocorrelation analysis, time-frequency analysis, neural network analysis, and chaos analysis. Each of these technologies has its own characteristics, and is applied in fields that take advantage of these characteristics.

  For example, autocorrelation analysis is useful for searching for a repetitive pattern included in time series information. The time-frequency analysis is performed by converting information in the time domain into information in the frequency domain, and is useful for analyzing information characteristics. Neural network analysis is applied in fields such as pattern recognition and data mining. Chaos analysis is useful for predicting future or past behavior from time-series information showing complex phenomena that cannot be predicted at first glance.

  In addition, a technique for performing analysis by converting time-series information into information in a spatial domain has been proposed (see, for example, Patent Documents 1 and 2). Patent Document 1 discloses orbit display analysis, dimension analysis, and Lyapunov spectrum analysis based on orbit data in a state space reconstructed by embedding time-series data such as power consumption, gas consumption, and object flow rate. And multi-faceted analysis such as entropy analysis and deterministic nonlinear prediction analysis. Further, Patent Document 2 analyzes a one-dimensional time series signal such as an acoustic signal or an audio signal based on non-stationary chaos analysis, and calculates a higher-order local autocorrelation coefficient from a two-dimensional image generated thereby. To extract features.

JP-A-6-96055 JP 2008-116588 A

  However, the techniques described in Patent Documents 1 and 2 analyze one piece of time series information, and there is a problem that a plurality of pieces of time series information cannot be analyzed in an integrated manner.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a technique for converting a plurality of pieces of time-series information into information in a spatial domain and performing an integrated analysis.

  In order to solve the above-described problem, in the present invention, a sample value extraction unit that repeatedly performs a process of extracting a set of sample values at the same time from each of a plurality of time-series information as a set, and a set By plotting multiple sample values extracted in step 1 as values of multiple axes in the spatial domain, a set of sample values extracted for multiple points in time is used, and multiple time-series information is converted into the spatial domain. It includes a time-space conversion unit that converts information, and an information output unit that outputs the spatial region information.

  According to the present invention configured as described above, a plurality of pieces of time-series information can be converted into one spatial region information and output, and the plurality of pieces of time-series information are integrated using the outputted spatial region information. Analysis.

It is a block diagram which shows the function structural example of the time series information analysis apparatus by this embodiment. It is a figure for demonstrating the processing content of the sample value extraction part by this embodiment. It is a figure for demonstrating the processing content of the time-space conversion part by this embodiment. It is a figure for demonstrating an example of the processing content of the information output part by this embodiment. It is a block diagram which shows the other function structural example of the time series information analysis apparatus by this embodiment. It is a figure which shows an example of the tendency analysis result output to a display etc. by the tendency analysis part of this embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating a functional configuration example of a time-series information analysis device 10 according to the present embodiment. As shown in FIG. 1, the time-series information analysis device 10 of the present embodiment includes a sample value extraction unit 1, a time-space conversion unit 2, and an information output unit 3 as its functional configuration.

  The functions of the functional blocks 1 to 3 of the time-series information analysis apparatus 10 can be realized by any of a hardware configuration, a DSP, and software. For example, when realized by software, each of the functional blocks 1 to 3 is actually configured by including a CPU or MPU of a computer, RAM, ROM, and the like, and can be realized by operating a program stored in the RAM or ROM.

  Therefore, it can be realized by recording a program that causes the computer to perform the functions of the functional blocks 1 to 3 on a recording medium such as a CD-ROM and causing the computer to read the program. As a recording medium for recording the program, a flexible disk, a hard disk, a magnetic tape, an optical disk, a magneto-optical disk, a DVD, a nonvolatile memory card, and the like can be used in addition to the CD-ROM. It can also be realized by downloading the program to a computer via a network such as the Internet.

  The sample value extraction unit 1 repeatedly performs a process of extracting a set of sample values at the same time point from each of a plurality of pieces of time-series information as a set. The plurality of time-series information is obtained, for example, by repeatedly observing temporal changes of a plurality of types of phenomena simultaneously. Alternatively, it is obtained by repeatedly observing a temporal change of one phenomenon from a plurality of different viewpoints.

  FIG. 2 is a diagram for explaining the processing contents of the sample value extraction unit 1 according to the present embodiment. Here, an example of extracting a set of sample values from the first time series information and the second time series information will be described.

As shown in FIG. 2 (a), the first time series information, the value _{x 1} at time _{t 1,} the value _{x 2} at time _{t 2,} the value _{x 3} at time _{t 3} Suppose that ... Further, as shown in FIG. 2B, the second time-series information has a value y _{1 at the} same time t ₁ as the first time-series information, a value y _{2 at} the time t ₂ , It is assumed that the value at time t ₃ is y ₃ ,. Here, the intervals of the times t ₁ , t ₂ , t ₃ ,... Can be arbitrarily determined. This interval may be constant or may not be constant.

As shown in FIG. 2C, the sample value extraction unit 1 uses the same time t ₁ , t ₂ , t ₃ ,... From each of the first time series information and the second time series information. A set of sample values (x ₁ , y ₁ ), (x ₂ , y ₂ ), (x ₃ , y ₃ ),.

  The time-space conversion unit 2 performs a process of plotting a plurality of sample values extracted by the sample value extraction unit 1 as a set on each of a plurality of axes in the spatial domain, and sets the sample values extracted for a plurality of time points. To convert a plurality of pieces of time-series information into spatial domain information.

FIG. 3 is a diagram for explaining the processing content of the time-space conversion unit 2 according to the present embodiment. Here, as shown in FIG. 2, a set of sample values (x ₁ , y ₁ ), (x ₂ , y ₂ ), (x ₃ , y ₃ ) from the first time series information and the second time series information. ),... Are extracted by the sample value extraction unit 1.

As shown in FIG. 3, the time-space conversion unit 2 uses the X-axis value as the sample value extracted from the first time-series information, and the Y-axis value as the sample value extracted from the second time-series information. .., And a set of sample values (x ₁ , y ₁ ), (x ₂ , y ₂ ), (x ₃ , y ₃ ),.

  The information output unit 3 outputs the spatial area information generated by the time-space conversion unit 2 to, for example, a computer display, a printer, or an external memory. At this time, the information output unit 3 may output the spatial region information generated by the time-space conversion unit 2 in the form of a graph, or draw and output a predetermined evaluation reference value on the graph. It may be. The evaluation reference value drawn here can be arbitrarily determined.

  Below, the specific application example of the time series information analysis apparatus 10 by this embodiment is demonstrated. The time-series information analysis device 10 of the present embodiment can be used, for example, for analyzing time-series information recorded in a drive recorder. The drive recorder records time-series information indicating temporal changes in acceleration detected by the biaxial acceleration sensor while the vehicle is traveling.

  Among the accelerations detected by the biaxial acceleration sensor, the acceleration in the X-axis direction is an acceleration related to the movement of the vehicle in the left-right direction. Specifically, a positive acceleration when the handle is operated to the right and a negative acceleration when the handle is operated to the left. Although the right rotation of the handle is positive and the left rotation is negative here, this may be reversed.

  Among the accelerations detected by the biaxial acceleration sensor, the acceleration in the Y-axis direction is an acceleration related to the movement of the vehicle in the front-rear direction. Specifically, the acceleration in the positive direction when accelerating when the accelerator is depressed and the acceleration in the negative direction when decelerating when the brake is depressed. Here, the acceleration is positive and the deceleration is negative, but this may be reversed.

The sample value extraction unit 1 uses the time-series information related to the acceleration in the X-axis direction as the first time-series information shown in FIG. 2A, and the time-series information related to the acceleration in the Y-axis direction is shown in FIG. As the second time series information, sets of sample values (x ₁ , y ₁ ), (x ₂ , y ₂ ) at the same time t ₁ , t ₂ , t ₃ ,. , (X ₃ , y ₃ ),.

The time-space conversion unit 2 uses the sample value extracted from the first time-series information regarding the acceleration in the X-axis direction as the sample value extracted from the X-axis value and the second time-series information regarding the acceleration in the Y-axis direction. Are set on the Y-axis, and a set of sample values (x ₁ , y ₁ ), (x ₂ , y ₂ ), (x ₃ , y ₃ ),. The result is shown in FIG.

  As shown in FIG. 4, the information output unit 3 graphs the spatial region information generated by the time-space conversion unit 2, and further draws and outputs predetermined evaluation reference values 41 and 42 on the graph. The evaluation reference values 41 and 42 drawn here are, for example, judgment reference values for dangerous driving.

  The evaluation reference value 41 indicated by the outer circle indicates that the acceleration is 0.4G. The value of 0.4G indicates a value that is approximately half of the limit value of acceleration (limit value of safe driving) that occurs when traveling on a general road with a radial tire. A value of 0.4 G indicates a limit value of acceleration of skid that occurs when cornering on a snowy road. Moreover, the value of 0.4 G indicates a boundary value that is a deduction target when acquiring a large type 1 or type 2 driving license.

  In short, the fact that a plot point exists outside the evaluation reference value 41 indicating the acceleration of 0.4 G indicates that there is a possibility of a dangerous driving at a time corresponding to the plot point. The evaluation reference value 42 indicated by the inner circle indicates that the acceleration is 0.3G. The existence of a plot point between the two evaluation reference values 41 and 42 indicates that there is a possibility that the vehicle is operating somewhat dangerously at the time corresponding to the plot point, although it is not as dangerous as the dangerous operation. ing.

  Further, according to the graph shown in FIG. 4, it is possible to specify what type of dangerous driving was performed depending on which region on the XY plane has a plot point exceeding the evaluation reference value 41. That is, when there is a plot point exceeding the evaluation reference value 41 on the plus region side on the X-axis, this indicates that the steering wheel is steered to the right during constant speed traveling. If there is a plot point that exceeds the evaluation reference value 41 on the minus region side on the X axis, this means that the steering wheel is suddenly moved to the left during constant speed traveling.

  Further, when there is a plot point exceeding the evaluation reference value 41 on the plus region side on the Y axis, it indicates that the vehicle has been accelerated rapidly by traveling straight ahead. If there is a plot point that exceeds the evaluation reference value 41 on the negative region side on the Y-axis, it indicates that the vehicle has suddenly braked straightly.

  Also, if there is a plot point that exceeds the evaluation reference value 41 in the first quadrant (X-axis value is positive, Y-axis value is positive) Represents. If there is a plot point that exceeds the evaluation reference value 41 in the second quadrant (X-axis value is negative and Y-axis value is positive), it means that the steering wheel is suddenly moved to the left while suddenly accelerating. Yes.

  Also, if there is a plot point that exceeds the evaluation reference value 41 in the third quadrant (X-axis value is negative, Y-axis value is negative) Represents. If there is a plot point that exceeds the evaluation reference value 41 in the fourth quadrant (X-axis value is positive and Y-axis value is negative), it means that the vehicle suddenly steers to the right while suddenly braking. Yes.

  In addition, when there are many plot points that are concentrated in the same area, the driver frequently performs the operation indicated in the area, and thus represents the tendency of the driver's driving method. It can be said. When many plot points are concentrated in an area exceeding the evaluation reference value 41 of 0.4 G, this indicates that the type of dangerous driving shown in that area has a high tendency.

  As described above, according to the time-series information analysis apparatus 10 of the present embodiment, a plurality of time-series information can be converted into one spatial region information and analyzed in an integrated manner. When the time series information analysis apparatus 10 of the present embodiment is applied to the waveform analysis of the drive recorder, the driving tendency of the driver as described with reference to FIG. 4 can be analyzed. That is, by converting two pieces of time-series information as shown in FIG. 2 into one piece of space area information as shown in FIG. 4, a driver who does not know even if the two pieces of time-series information are individually analyzed as time-series information. The driving tendency can be identified.

  It is possible for the user who sees it to grasp the driving tendency of the driver just by outputting the graph as shown in FIG. 4 to the display or the like, but the time series information analysis apparatus 10 performs this tendency analysis. It may be. In this case, as shown in FIG. 5, the time-series information analysis device 10 includes a trend analysis unit 4 for performing trend analysis using the spatial region information generated by the time-space conversion unit 3 as its functional configuration. In addition. The trend analysis unit 4 outputs the result of the trend analysis to a display or the like.

  FIG. 6 is a diagram illustrating an example of the trend analysis result output to the display or the like by the trend analysis unit 4. In the example of FIG. 6, the information indicating the trend analysis result includes a graph 61 generated by plotting sample values extracted from a plurality of pieces of time-series information (output waveforms of each axis of the two-dimensional acceleration sensor) in a spatial domain. , A commentary graph 62 explaining how to read the graph 61, a comment description column 63 regarding the driving tendency derived from the graphs 61, 62, and an evaluation column indicating the degree of dangerous driving (for example, five levels A to E) 64.

  Here, depending on how many quadrants of the graphs 61 and 62 or on which axis there are plot points having a value exceeding the evaluation reference value 41 of 0.4G or the evaluation reference value 42 of 0.3G, a comment description column is provided. The content of the comment described in 63 is predetermined and stored. The degree of dangerous driving is determined in advance depending on how many plot points have values exceeding the evaluation reference value 41 of 0.4G or the evaluation reference value 42 of 0.3G.

  The graph generated by plotting sample values extracted from a plurality of time series information in the spatial domain may be a graph on two-dimensional coordinates on the XY plane, as shown in FIGS. As shown in the graph 61 of FIG. 6, it may be a graph on three-dimensional coordinates in the XYZ space. In the graph 61 of FIG. 6, the values of the X axis and the Y axis are the same as those in FIGS. The Z-axis value indicates how often the sample value is plotted on the same XY coordinate. When a graph in a three-dimensional space is generated in this way, the shape and height of the graph expresses the driving tendency of the driver.

  Here, an example in which two pieces of time-series information to be analyzed are both related to acceleration has been described, but the present invention is not limited to this. For example, one may be X-axis or Y-axis acceleration information, and the other may be speed information. Here, the waveform analysis of the drive recorder has been taken up as an application example of the time-series information analysis apparatus 10 according to the present embodiment, but it goes without saying that various other applications are possible.

  Moreover, although the example which converts two time series information into one space area information was demonstrated in the said embodiment, you may make it convert three or more time series information into one space area information.

  In addition, each of the above-described embodiments is merely an example of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner. That is, the present invention can be implemented in various forms without departing from the gist or the main features thereof.

1 Sample value extraction unit 2 Time-space conversion unit 3 Information output unit 4 Trend analysis unit

Claims (4)

A sample value extraction unit that repeatedly performs a process of extracting a set of sample values at the same time point from each of a plurality of time series information for a plurality of time points;
By performing a process of plotting a plurality of sample values extracted in a set by the sample value extraction unit as values of a plurality of axes in a spatial domain, on a set of sample values extracted for the plurality of time points, A time-space conversion unit for converting the plurality of time series information into space domain information;
An information output unit that outputs the spatial region information generated by the time-space conversion unit. The time series information analysis apparatus according to claim 1, wherein the information output unit graphs the spatial region information, and draws and outputs a predetermined evaluation reference value on the graph. The time-series information analysis apparatus according to claim 1, further comprising a trend analysis unit that performs a trend analysis using the spatial region information generated by the time-space conversion unit. Sample value extraction means for repeatedly performing a process of extracting a set of sample values at the same time point from each of a plurality of time series information for a plurality of time points;
By performing a process of plotting a plurality of sample values extracted in a set by the sample value extraction unit as values of a plurality of axes in a spatial domain, on a set of sample values extracted for the plurality of time points, A computer-readable program for causing a computer to function as time-space conversion means for converting the plurality of time-series information into space-domain information, and information output means for outputting the space-domain information generated by the time-space conversion means Program for analyzing time series information.

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