JP4987872B2 - Information recording apparatus, information recording method, information recording program, and computer-readable recording medium - Google Patents

Description

  The present invention relates to an information recording apparatus, an information recording method, an information recording program, and a computer-readable recording medium for processing information. However, the use of the present invention is not limited to the above-described information recording apparatus, information recording method, information recording program, and computer-readable recording medium.

  2. Description of the Related Art Conventionally, a drive recorder that records the surrounding situation of a running vehicle is known in the same manner as a flight recorder mounted on an airplane. Such a drive recorder has, for example, a front camera for photographing the front of the vehicle, a rear camera for photographing the rear, and a function of writing the front and rear images in a predetermined area of the image memory in synchronization with the reference signal. Record information in which vehicle position information and time information are added to the memory information is constantly recorded in the buffer memory.

  And if a drive recorder detects the impact more than predetermined value with an impact detection sensor, it will preserve | save in the storage memory the recording information between predetermined time from a detection time. As described above, when an incident such as a escaping incident is encountered, the recorded vehicle stored in the storage memory can be confirmed to identify the escaping vehicle (for example, see Patent Document 1 below).

JP 2004-224105 A

  However, the above-described conventional technology is configured to store the recorded information by determining whether or not an incident has been encountered using a predetermined threshold value. Accordingly, an example of a problem that a determination using a predetermined threshold is an erroneous determination result due to a difference in the traveling state of the vehicle is given as an example.

  Specifically, for example, if the vehicle is traveling at high speed, the output value of the impact detection sensor will increase even if the impact is small due to road undulations, etc. Will be saved. Therefore, not only the recording area is compressed by extra recording information not related to the incident, but if the recording area becomes full, necessary recording information cannot be stored.

  On the other hand, when the vehicle is traveling at a low speed, the output value of the impact detection sensor is small even if an impact is caused by a contact accident or the like, so that the recorded information is not saved even if an event is encountered. Therefore, the necessary record information indicating that an incident has been encountered cannot be stored, and an accurate analysis of the incident cannot be performed.

  In order to solve the above-described problems and achieve the object, the information recording apparatus according to the invention of claim 1 captures a peripheral image from a moving moving body and continuously inputs the captured peripheral image. In the information recording apparatus for overwriting recording, the detecting means for detecting the behavior of the moving body and outputting the detected value, the output value from the detecting means, and the behavior of the moving body are stored in the moving body. A comparison means for comparing the threshold value with respect to the output value for determining whether or not it is a dangerous factor, and the output value exceeds the threshold value as a result of comparison by the comparison means. A storage unit that stores the captured peripheral video, an acquisition unit that acquires information on a traffic flow on a route along which the moving body moves, and the threshold appropriately according to a traveling state of the moving body. Change the value to Determining means for determining the threshold value to be compared with the output value by the comparing means, wherein the determining means is configured so that the mobile object is based on the traffic flow acquired by the acquiring means. Before entering a different section, the threshold value is varied in accordance with the different traffic flow, and the threshold value to be compared with the output value by the comparison means is determined.

  According to a second aspect of the present invention, there is provided the information recording method according to the second aspect of the present invention, wherein the surrounding video is picked up from a moving moving body, and the captured peripheral video that is continuously input is overwritten and recorded. A detection step of detecting the behavior of the body and outputting the detected value; an output value from the detection step; and whether the behavior of the moving body is a dangerous factor for the moving body. A comparison step of comparing a threshold value for the output value for determination and a comparison result of the comparison step; if the output value exceeds the threshold value, the captured peripheral image is stored; A storage step, an acquisition step of acquiring information relating to traffic flow on a route along which the mobile body moves, and the threshold value is appropriately varied according to a traveling state of the mobile body, and the comparison step is performed. To compare with the output value And determining the threshold value, wherein the determining step is based on the traffic flow acquired by the acquiring step before the mobile body enters a different section of the traffic flow. The threshold value is varied according to different traffic flows, and a threshold value for comparison with the output value in the comparison step is determined.

  According to a third aspect of the present invention, an information recording program causes a computer to execute the information recording method according to the second aspect.

  According to a fourth aspect of the present invention, a computer-readable recording medium records the information recording program according to the third aspect.

It is a block diagram which shows an example of a functional structure of the information recording device concerning this Embodiment. It is a flowchart which shows the content of the process of the information recording device concerning this Embodiment. It is a block diagram which shows an example of the hardware constitutions of the navigation apparatus concerning a present Example. It is explanatory drawing (the 1) which shows the outline | summary of the threshold value determination which detects the trigger concerning a present Example. It is explanatory drawing (the 2) which shows the outline | summary of the threshold value determination which detects the trigger concerning a present Example. It is explanatory drawing (the 3) which shows the outline | summary of the threshold value determination which detects the trigger concerning a present Example. It is explanatory drawing (the 4) which shows the outline | summary of the threshold value determination which detects the trigger concerning a present Example. It is a flowchart which shows the content of the process of the navigation apparatus concerning a present Example.

  Exemplary embodiments of an information recording apparatus, an information recording method, an information recording program, and a computer-readable recording medium according to the present invention are explained in detail below with reference to the accompanying drawings.

(Embodiment)
(Functional configuration of information recording device)
The functional configuration of the information recording apparatus according to this embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing an example of a functional configuration of the information recording apparatus according to the present embodiment.

  In FIG. 1, an information recording apparatus 100 that captures surrounding video from a moving moving body and overwrites and records the continuously input captured peripheral video includes a detection unit 101, a determination unit 102, and an acquisition unit. 103, a comparison unit 104, and a storage unit 105.

  The detection unit 101 detects the behavior of the moving body and outputs the detected value. Specifically, for example, the detection unit 101 detects an output value from a sensor related to the behavior of the moving object. The behavior of the moving body is, for example, the operation or operation of the moving body. The sensors related to the movement and operation of the moving body include, for example, information related to operations such as a vibration sensor, a G sensor, a contact sensor for the moving body, a handle operation, a direction instruction signal input operation, an accelerator pedal operation, and a brake pedal operation May be a sensor that can output.

  The determination unit 102 determines a threshold value to be compared with an output value from a sensor relating to the behavior of the moving body by the comparison unit 104 described later according to the traveling state of the moving body. The traveling state is information including, for example, a moving path of the moving body, a moving speed, an object having a dangerous behavior, a detection result in which the behavior is detected, and the like.

  This threshold value is, for example, a threshold value for an output value from a sensor relating to the behavior of the moving body for determining whether or not the behavior of the moving body becomes a risk factor for the moving body. It is a value that can be determined to be dangerous behavior based on the output values of various sensors such as the G sensor.

  Specifically, for example, the determination unit 102 may determine the threshold value according to the moving speed of the moving body that is the traveling state at the time when the behavior is detected by the detection unit 101. More specifically, for example, when the moving body is a vehicle and the detection unit 101 is a G sensor, the threshold is determined according to the moving speed if the moving speed obtained from the vehicle is high. Decrease the threshold value according to the moving speed if the moving speed of the vehicle is slow. The video information captured for the behavior of the vehicle in the vehicle may be stored. That is, if the threshold value is determined according to the moving speed of the moving body, only the video information with high utility value can be stored among the captured video information.

  In addition, the determination unit 102 sets the threshold value according to the relative speed between the moving body and another moving body that is different from the moving body, for example, the running state at the time when the behavior is detected by the detecting unit 101. It may be determined. More specifically, for example, when the relative speed increases, the threshold is determined to be higher according to the speed, and when the relative speed is slower, the threshold is decreased according to the speed. You may decide.

  Furthermore, the determination unit 102 may determine the threshold value according to the continuous moving time of the moving body, which is the running state at the time when the behavior is detected by the detection unit 101. More specifically, for example, when the moving body is a vehicle, the moving speed is obtained from the continuous moving time of the vehicle and the moving distance at the continuous moving time, and if the moving speed is high, the moving speed is determined according to the moving speed. The threshold value may be determined to be high, and if the moving speed is slow, the threshold value may be determined to be low according to the speed. That is, the threshold value can be determined according to the length of the continuous movement time.

  In addition, when the running state at the time of determining the threshold changes after that, the determining unit 102 may determine the threshold again according to the change in the running state. More specifically, for example, the threshold value is determined when the movement speed becomes lower than a predetermined speed from the movement speed at the time when the threshold value is determined higher because the movement speed has increased. The threshold value may be determined to be low according to the moving speed that is slower than this speed. That is, the threshold value is not changed when the difference between the changing moving speeds is within the predetermined speed, and the threshold value is changed according to the moving speed when the difference is equal to or higher than the predetermined speed. In addition, since the moving speed is assumed to change immediately, the moving speed that exceeds the predetermined speed continues for a predetermined time, or the moving speed that exceeds the predetermined speed continues a predetermined number of times. Then, the threshold value may be changed by determining whether it has been detected. Also, not limited to the difference, calculate how much the changing moving speed has changed with respect to the previous moving speed, and determine whether the calculated ratio falls within a predetermined range. It may be determined whether or not to change the value.

  The determination unit 102 may determine the threshold value according to traffic information acquired by the acquisition unit 103 described later at the time when the behavior is detected by the detection unit 101.

  The acquisition unit 103 acquires traffic information on a route along which the moving body moves. The traffic information may be information including, for example, information on traffic congestion, traffic regulation, road type, and the like on the route along which the moving body moves. Note that the threshold value may be determined based on, for example, traffic jam information acquired by the acquisition unit 103. For example, there is a traffic jam on the travel route, and the threshold value is determined in advance according to the traffic speed in the traffic jam section before entering the traffic jam zone from the traffic jam information (such as the travel speed in the traffic jam section). You may do it.

  The comparison unit 104 is a threshold value for the output value from the detection unit 101 for determining whether the output value detected by the detection unit 101 and the behavior of the moving body are a risk factor for the moving body. And compare. Specifically, for example, the comparison unit 104 may compare the output value detected by the detection unit 101 with the threshold value determined by the determination unit 102. More specifically, for example, the comparison unit 104 determines whether the behavior of the moving body is a dangerous behavior that becomes a risk factor for the moving body by comparing the output value with a threshold value. Can do.

  When the output value exceeds the threshold value as a result of comparison by the comparison unit 104, the storage unit 105 stores the captured peripheral video in a recording medium (not shown). The peripheral video may be stored, for example, by storing the peripheral video for a certain period of time before and after the output value exceeds the threshold value. Moreover, you may preserve | save the driving | running state of a moving body with a periphery image | video.

(Contents of information recording device processing)
Next, the processing contents of the information recording apparatus 100 according to the present embodiment will be described with reference to FIG. FIG. 2 is a flowchart showing the contents of processing of the information recording apparatus according to the present embodiment. In the flowchart of FIG. 2, first, the behavior of the moving body is detected by the detection unit 101, and it is determined whether or not the detected value is output (step S201).

  In step S201, when the detected value is output after waiting to be output (step S201: Yes), the determination unit 102 determines the comparison unit according to the traveling state of the moving object when the behavior is detected. A threshold for comparison with the output value is determined by 104 (step S202). This threshold value may be, for example, a value for determining whether the behavior is a dangerous behavior that becomes a risk factor for the moving object.

  Next, the comparison unit 104 compares the output value detected in step S201 with the threshold value determined in step S202 (step S203).

  If the output value exceeds the threshold value as a result of the comparison in step S203 by the storage unit 105, the peripheral image captured from the moving moving body is stored in a recording medium (not shown) (step S204). Then, a series of processing is completed.

  Although not described in the flowchart of FIG. 2, instead of using the traveling state in step S <b> 202, traffic information may be acquired and a threshold value corresponding to the traffic information may be determined. Further, the threshold value may be determined according to the running state and traffic information.

  As described above, according to the present embodiment, an appropriate threshold value can be determined according to the traveling state and traffic information of the moving object, so that the dangerous behavior of the moving object can be accurately determined, and the surrounding video is displayed. And optimization of storage of driving conditions.

  Examples of the present invention will be described below. In the present embodiment, an example in which the information recording device of the present invention is implemented by a navigation device mounted on a moving body such as a vehicle (including a four-wheeled vehicle and a two-wheeled vehicle) will be described.

(Hardware configuration of navigation device)
First, the hardware configuration of the navigation device according to the present embodiment will be described with reference to FIG. FIG. 3 is a block diagram illustrating an example of a hardware configuration of the navigation device according to the present embodiment.

  In FIG. 3, a navigation device 300 is mounted on a moving body such as a vehicle, and includes a CPU 301, ROM 302, RAM 303, magnetic disk drive 304, magnetic disk 305, optical disk drive 306, optical disk 307, and audio. I / F (interface) 308, microphone 310, speaker 309, input device 311, video I / F 312, display 313, communication I / F 314, GPS unit 315, various sensors 316, and camera 317 And. Each component 301 to 317 is connected by a bus 320.

  First, the CPU 301 governs overall control of the navigation device 300. The ROM 302 records programs such as a boot program, a route search program, a route guidance program, a voice generation program, and a display program. The RAM 303 is used as a work area for the CPU 301.

  Here, the route search program searches for the optimum route from the departure point to the destination point using map information recorded on the optical disk 307 to be described later. Here, the optimum route is the shortest (or fastest) route to the destination point or the route that best matches the conditions specified by the user. The guidance route searched by executing the route search program is output to the audio I / F 308 and the video I / F 312 via the CPU 301.

  The route guidance program is real-time based on the guidance route information searched by executing the route search program, the current location information of the navigation device 300 acquired by the communication I / F 314, and the map information read from the optical disc 307. Generation of simple route guidance information. The route guidance information generated by executing the route guidance program is output to the audio I / F 308 and the video I / F 312 via the CPU 301.

  The voice generation program generates tone and voice information corresponding to the pattern. That is, based on the route guidance information generated by executing the route guidance program, the virtual sound source corresponding to the guidance point is set and the voice guidance information is generated, and output to the voice I / F 308 via the CPU 301.

  The display program determines the display format of the map information to be displayed on the display 313 by the video I / F 312 and displays the map information on the display 313 according to the determined display format.

  Further, the CPU 301 may be configured to switch the recording destination of the traveling state of the vehicle that has always been overwritten when a trigger is detected by various sensors 316 described later. The recording destination of the running state may have, for example, an overwriting recording area for overwriting the running state at all times, and a storage recording area for saving the running state when a trigger is detected. The recording medium and the storage recording medium may be provided. Further, there may be a plurality of overwriting recording areas and overwriting recording media.

  Further, the CPU 301 determines a threshold value for detecting a trigger described later. Although details will be described with reference to FIGS. 4 to 7, the threshold value may be determined according to, for example, the traveling state of the vehicle or traffic information on the route being traveled.

  The trigger is, for example, an output of various sensors 316 that triggers saving of an image for a drive recorder to be described later, and when the output value exceeds the threshold value determined by the CPU 301 from the various sensors 316. A configuration in which a trigger is detected may be used.

  More specifically, for example, the trigger is detected when the output of the G sensor that detects an impact on the vehicle exceeds a threshold value determined by the CPU 301. In other words, the drive recorder image is stored on the assumption that there is a high possibility that the vehicle has encountered a collision accident or the like due to the impact detection exceeding the threshold.

  As described above, the threshold value for detecting the trigger is used to approximate a situation that is determined to be an accident such as a contact, as distinguished from vibration in normal driving. However, the output value of the G sensor when the vehicles contact each other is, for example, a minute value when traveling at a low speed including other vehicles before and after such as in a traffic jam as compared to during normal traveling. In addition, the output value of the G sensor for running vibration is also a minute value compared to during normal running.

  Therefore, as a specific example of determining the threshold according to the driving state of the vehicle and the traffic information on the traveling route, when the threshold for detecting a trigger in a traffic jam or at a low speed is determined to be low, contact etc. This has the effect of preventing accidents from being overlooked. In particular, contact accidents are likely to occur frequently during traffic jams, etc., so it is effective to prevent oversight and save the drive recorder image.

  Here, the determination of the vehicle speed used as a reference for determining the threshold value may be based on the vehicle speed of the host vehicle, for example, by a vehicle speed sensor, or an infrared sensor or image analysis of a captured other vehicle. The relative speed may be used as a reference, or the vehicle speed of another vehicle may be used as a reference. Alternatively, the vehicle speed may be determined based on, for example, comparing the vehicle speed of the own vehicle with the vehicle speed of the other vehicle, whichever is faster.

  In the above description, the vehicle speed in the running state of the vehicle is used as a reference for determining the threshold value. However, in other configurations, traffic jam information, continuous operation time, average speed, weather information, and the like are used. There may be. Further, the threshold value may be determined by predicting a change in the vehicle speed immediately before reaching a point where the vehicle speed actually changes based on prediction information such as traffic jam information.

  Further, the CPU 301 may be configured to determine an output pattern of various sensors 316 serving as a trigger instead of the threshold value.

  As described above, by appropriately determining the threshold value for detecting the trigger according to the traveling state of the vehicle, traffic information, and the like, the drive recorder image at the time of the accident can be accurately stored without being lost.

  The magnetic disk drive 304 controls the reading / writing of the data with respect to the magnetic disk 305 according to control of CPU301. The magnetic disk 305 records data written under the control of the magnetic disk drive 304. As the magnetic disk 305, for example, an HD (hard disk) or an FD (flexible disk) can be used.

  The optical disk drive 306 controls reading / writing of data with respect to the optical disk 307 according to the control of the CPU 301. The optical disk 307 is a detachable recording medium from which data is read according to the control of the optical disk drive 306. As the optical disc 307, a writable recording medium can be used. In addition to the optical disk 307, the removable recording medium may be an MO, a memory card, or the like.

  As an example of information recorded on the magnetic disk 305 and the optical disk 307, internal and external audio and video obtained by a microphone 310 and a camera 317, which will be described later, current position information of a vehicle detected by a GPS unit 315, which will be described later, Examples include output values from various sensors 316. Further, the trigger information may be accumulated and stored based on the trigger detected from the outputs of the various sensors 316. These pieces of information are recorded by the drive recorder function of the navigation device 300 and used as verification materials when a traffic accident occurs.

  Other examples of information recorded on the magnetic disk 305 and the optical disk 307 include map information used for route search and route guidance. The map information includes background data representing features (features) such as buildings, rivers, and the ground surface, and road shape data representing the shape of the road. The map information is displayed two-dimensionally or three-dimensionally on the display screen of the display 313. Drawn. When the navigation device 300 is guiding a route, the map information and the current location of the vehicle acquired by the GPS unit 315 described later are displayed in an overlapping manner.

  In this embodiment, the map information is recorded on the magnetic disk 305 and the optical disk 307. However, the present invention is not limited to this. The map information is not recorded only on the one provided integrally with the hardware of the navigation device 300, and may be provided outside the navigation device 300. In that case, the navigation apparatus 300 acquires map information via a network through the communication I / F 314, for example. The acquired map information is recorded in the RAM 303 or the like.

  The audio I / F 308 is connected to a microphone 310 for audio input and a speaker 309 for audio output. The sound received by the microphone 310 is A / D converted in the sound I / F 308. In addition, sound is output from the speaker 309. Note that the sound input from the microphone 310 can be recorded on the magnetic disk 305 or the optical disk 307 as sound data.

  Examples of the input device 311 include a remote controller including a plurality of keys for inputting characters, numerical values, various instructions, a keyboard, a mouse, a touch panel, and the like.

  The video I / F 312 is connected to the display 313 and the camera 317. Specifically, the video I / F 312 includes, for example, a graphic controller that controls the entire display 313, a buffer memory such as a VRAM (Video RAM) that temporarily records image information that can be displayed immediately, and a graphic controller. Based on the output image data, the display 313 is configured by a control IC or the like.

  The display 313 displays icons, cursors, menus, windows, or various data such as characters and images. As the display 313, for example, a CRT, a TFT liquid crystal display, a plasma display, or the like can be adopted. A plurality of displays 313 may be provided in the vehicle, for example, for the driver and for a passenger seated in the rear seat.

  The camera 317 captures images inside or outside the vehicle. The image may be either a still image or a moving image. For example, the behavior of the passenger inside the vehicle is photographed by the camera 317, and the photographed image is output to a recording medium such as the magnetic disk 305 or the optical disk 307 via the video I / F 312. To do. The camera 317 captures a situation outside the vehicle, and outputs the captured video to a recording medium such as the magnetic disk 305 or the optical disk 307 via the video I / F 312. The video output to the recording medium is overwritten and stored as a drive recorder image.

  Further, the communication I / F 314 is connected to a network via wireless and functions as an interface between the navigation device 300 and the CPU 301. The communication I / F 314 is further connected to a communication network such as the Internet via wireless, and also functions as an interface between the communication network and the CPU 301.

  Communication networks include LANs, WANs, public line networks and mobile phone networks. Specifically, the communication I / F 314 includes, for example, an FM tuner, a VICS (Vehicle Information and Communication System) / beacon receiver, a radio navigation device, and other navigation devices. Get road traffic information such as regulations. VICS is a registered trademark.

  Further, the GPS unit 315 uses a received wave from a GPS satellite and an output value from various sensors 316 described later (for example, an angular velocity sensor, an acceleration sensor, a tire rotation number, etc.) to detect the current position of the vehicle (the navigation device 300). Information indicating the current location). The information indicating the current location is information for specifying one point on the map information such as latitude / longitude and altitude.

  The various sensors 316 are a vehicle speed sensor, an acceleration sensor, a G sensor, an angular velocity sensor, and the like, and their output values are used for calculation of the current point by the GPS unit 315, measurement of changes in speed and direction, and the like. Specifically, for example, the various sensors 316 output an odometer, a speed change amount, an azimuth change amount, and the like. Based on this output value, it is possible to analyze dynamics such as sudden braking and sudden steering.

  The various sensors 316 also include sensors that detect each operation of the vehicle by the driver. The detection of each operation of the vehicle may be configured to detect, for example, steering operation, turn signal input, accelerator pedal depression, brake pedal depression, or the like. Further, the output values of the various sensors 316 may be data recorded by the drive recorder function.

  In the various sensors 316, the trigger for storing the drive recorder image is determined by the CPU 301 as described above, and when the trigger is detected, the drive recorder image is stored in the magnetic disk 305, the optical disk 307, or the like. It is also good to do. The trigger is, for example, a trigger for storing the drive recorder image, and the configuration may be such that the output of various sensors 316 is equal to or higher than a predetermined threshold or output approximate to a predetermined pattern.

  More specifically, for example, triggers in the various sensors 316 may be set when vibrations exceeding a specified level or a predetermined vibration pattern are detected by the vibration sensor. The predetermined vibration pattern may be a vibration pattern that exhibits an abnormality such as a sudden rise. Further, the trigger may be set when, for example, a G sensor more than a prescribed value or a predetermined G pattern is detected by the G sensor. The predetermined G may be applied as long as the pattern shows an abnormality such as a sudden rise. Or the structure which makes the trigger the presence or absence of contact with others, the action | operation of an airbag, or the stop of a vehicle by the contact sensor of a vehicle body may be sufficient. Furthermore, the above-described triggers may be one or more, and a plurality of triggers may be combined.

  Of the functional configuration of the information recording apparatus 100 according to the embodiment, the detection unit 101 is based on various sensors 316, the determination unit 102 and the comparison unit 104 are based on the CPU 301, and the acquisition unit 103 is based on the communication I / F 314. The functions 105 are realized by the magnetic disk drive 304 and the optical disk drive 306, respectively.

(Overview of threshold determination for detecting triggers)
Next, an outline of threshold value determination for detecting a trigger according to the present embodiment will be described with reference to FIGS. FIG. 4 is an explanatory diagram (part 1) illustrating an outline of threshold determination for detecting a trigger according to the present embodiment. In the description of FIGS. 4 to 7, the case where the threshold value of the G sensor is determined using the vehicle speed corresponding to the output value of the vehicle speed pulse as a reference for determining the threshold value will be described.

  In FIG. 4, a threshold value determination graph 400 is a graph in which the threshold value is low when the vehicle speed is low and the threshold value is high when the vehicle speed is high. Specifically, for example, the threshold value determination graph 400 is a graph in which the threshold value increases in proportion to the vehicle speed, and the threshold value of the G sensor determined when the vehicle speed is v1 is k1.

  In other words, if the threshold value is determined to be low when the vehicle speed is low, the trigger detection threshold value is low even for an accident where the output value of the G sensor is low, which is encountered while the vehicle is traveling at low speed. Images can be saved. In addition, if the threshold value is determined to be high when the vehicle speed is high, the trigger detection threshold value is not set for the output value of the G sensor that is not an accident caused by the road shape with small unevenness while the vehicle is traveling at high speed. Since it is expensive, the drive recorder image is not unnecessarily stored. In other words, by determining the trigger detection threshold according to the vehicle speed, it is possible to accurately save the drive recorder image, and confirming the drive recorder image is useful for later accident verification. be able to.

  FIG. 5 is an explanatory diagram (part 2) illustrating an outline of threshold determination for detecting a trigger according to the present embodiment. In FIG. 5, a threshold value determination graph 500 is a graph in which the threshold value is low when the vehicle speed is low and the threshold value is high when the vehicle speed is high. Specifically, for example, the threshold value determination graph 500 is a graph in which the threshold value increases in inverse proportion to the square of the vehicle speed, and the threshold value of the G sensor determined when the vehicle speed is v2 is k2. is there.

  FIG. 6 is an explanatory diagram (part 3) illustrating an outline of threshold determination for detecting a trigger according to the present embodiment. In FIG. 6, the threshold value determination graph 600 shows that the threshold value is constant when the vehicle speed is equal to or less than p and is equal to or greater than q. The value is a highly determined graph. Specifically, for example, the threshold value determination graph 600 is determined when the threshold value of the G sensor determined when the vehicle speed is equal to or less than p is kp, and when the vehicle speed is v3 between p and q. The threshold value is k3 of the G sensor, and the threshold value determined when the vehicle speed is q or more is kq of the G sensor.

  For example, the threshold value may be determined in real time every time the vehicle speed is acquired. However, when the vehicle speed changes more than a predetermined value from the threshold value currently determined, the threshold value is again set. It is good also as a structure to determine.

  FIG. 7 is an explanatory diagram (part 4) illustrating an outline of threshold determination for detecting a trigger according to the present embodiment. In FIG. 7, a threshold value determination graph 700 is a graph in which the threshold value increases in proportion to the vehicle speed, and the threshold value of the G sensor determined when the vehicle speed is v4 is determined when k4 and the vehicle speed v5. The threshold value of the G sensor to be set is k5. Further, “a” on the threshold value determination graph 700 indicates a change reference value.

  For example, if the current vehicle speed is v4 in the threshold value determination graph 700, the change reference value a is fixed at k4 without revising the threshold value when the vehicle speed is within the change reference value a from v4. It is a value to be. That is, the G sensor threshold value k5 is determined again from the vehicle speed v5 when the vehicle speed v4 changes to be larger than the change reference value a to become the vehicle speed v5.

  As described above, if the threshold value is determined by setting the change reference value a, it is possible to avoid the threshold value from being randomly determined according to the change in the vehicle speed. The load for threshold determination can be reduced.

  4 to 7, the threshold value is determined using the threshold value determination graphs 400, 500, 600, and 700. However, a calculation formula may be used instead of the graph. Specifically, for example, a formula that approximates a graph may be used as the calculation formula, or the threshold value may be determined by acquiring the vehicle speed in real time.

  In the description of FIGS. 4 to 7, the case where the threshold value of the G sensor is determined using the vehicle speed corresponding to the output value of the vehicle speed pulse as the reference for determining the threshold value has been described. There is no limit.

  The reference for determining the threshold may be, for example, a configuration using vehicle speed of the own vehicle or another vehicle, or using a continuous operation time, average speed, traffic jam information, weather information, or the like. Specifically, for example, as for the vehicle speed of the other vehicle, the relative speed between the host vehicle and the other vehicle is calculated using output values of an infrared sensor, an ultrasonic sensor, or the like, or an image captured by the camera 317 is analyzed. It may be obtained by doing. Moreover, the vehicle speed of another vehicle is good also as acquiring from another vehicle using communication between vehicles by communication I / F314, for example.

  Further, the number of other vehicles is not limited to one, and the vehicle speed may be acquired by, for example, acquiring vehicle speeds of a plurality of vehicles located within a predetermined range from the own vehicle. Specifically, for example, the vehicle speed may be acquired by acquiring an average value or the fastest value of vehicle speeds in a plurality of vehicles.

  In addition, traffic information such as traffic congestion and traffic regulations distributed from the VICS (registered trademark) center by the communication I / F 314 may be acquired, or weather information may be acquired. More specifically, for example, the traffic information may be used by replacing the average speed of the vehicle calculated from the acquired traffic information with the vehicle speed described with reference to FIGS.

  If travel time information or the like is obtained from traffic information, the moving speed of the vehicle may be calculated by dividing the distance of the target section by the travel time. Further, when only the information indicating that there is a traffic jam is acquired, the predetermined speed may be used as the vehicle speed described with reference to FIGS.

  Furthermore, traffic information such as traffic jams and traffic regulations may be used when traffic information is reached, for example, when it reaches a traffic jam point or before a predetermined distance from the traffic jam point. More specifically, for example, when using traffic jam information, the threshold is determined by using the traffic jam information as a reference value for determining the threshold after reaching the traffic jam point, or the traffic jam occurs before the traffic jam point. The threshold may be determined using information.

  When the traffic jam prediction information is acquired, the vehicle speed may be predicted and the threshold value may be determined before a predetermined time when the traffic jam occurs. In this way, if the threshold value is determined using the traffic jam information from before the traffic jam point, the threshold value for trigger detection can be determined with sufficient time, so it is possible to record without leaking the occurrence of an accident or the like. Can do.

  Further, the threshold value to be determined is not limited to the G sensor, and any one or more threshold values or output patterns of various sensors 316 may be determined.

  More specifically, the threshold values and output patterns of the various sensors 316 are, for example, output patterns of vibrations indicating abnormalities such as sudden rises in vibration sensors, and output patterns of how to apply predetermined G in the G sensor. Etc. Alternatively, an output pattern such as steering operation, turn signal input, accelerator pedal depression, or brake pedal depression may be used. When these output patterns are used, for example, the output pattern may be determined by preparing an output pattern corresponding to a criterion for determining a threshold such as a vehicle speed.

  In this way, versatility can be improved by using a criterion for determining an arbitrary threshold and an arbitrary threshold (or output pattern). Further, a more accurate trigger can be detected by combining a reference for determining a plurality of threshold values and threshold values (or output patterns).

(Contents of processing of navigation device 300)
Next, contents of processing of the navigation device 300 according to the present embodiment will be described with reference to FIG. FIG. 8 is a flowchart showing the contents of processing of the navigation device according to the present embodiment. In the flowchart of FIG. 8, the navigation device 300 first determines whether or not the vehicle has started running (step S801). For example, the determination regarding the traveling of the vehicle may be made with reference to the outputs of the various sensors 316.

  In step S801, when it is determined that the vehicle has started running after waiting for the vehicle to start running (step S801: Yes), the magnetic disk drive 305 and the optical disk drive 306 are controlled by the CPU 301. Overwrite recording (step S802) of the drive recorder image taken by the camera 317 is started on a recording medium such as 307, and the overwriting recording is continued while the vehicle is traveling. Overwrite recording is, for example, recording a moving image over a certain period of time by sequentially overwriting so as not to exceed the recording capacity of the recording medium, and has a recording medium for overwriting recording and a recording medium for overwriting recording To record. And the vehicle speed of a vehicle is acquired by the various sensors 316 (step S803). The acquisition of the vehicle speed may be, for example, the speed of the own vehicle, the speed of the other vehicle, or the relative speed between the own vehicle and the other vehicle.

  Next, a threshold value for trigger detection is determined by the CPU 301 using the vehicle speed acquired in step S803 (step S804). The threshold for trigger detection may be performed, for example, with reference to any of the threshold determination graphs 400, 500, 600, and 700 described above with reference to FIGS. 4 to 7 for the vehicle speed acquired in step S803. .

  Next, the CPU 301 determines whether or not a trigger is detected based on the threshold value determined in step S804 (step S805). More specifically, for example, the detection of the trigger is when the output from the various sensors 316 exceeds the threshold value determined in step S804, and is an opportunity to save the drive recorder image.

  If a trigger is detected in step S805 (step S805: Yes), the drive recorder image is stored in a recording medium such as the magnetic disk 305 or the optical disk 307 under the control of the magnetic disk drive 304 or the optical disk drive 306 by the CPU 301 ( Together with step S806), the navigation apparatus 300 determines whether or not the vehicle has finished traveling (step S807).

  If no trigger is detected in step S805 (step S805: No), the process proceeds to step S807, and the navigation device 300 determines whether the vehicle has finished traveling (step S807). For example, the determination regarding the traveling of the vehicle may be made with reference to the outputs of the various sensors 316. More specifically, it may be determined that the vehicle has finished traveling when the output of the various sensors 316 stops.

  In step S807, when the travel of the vehicle does not end (step S807: No), the process returns to step S803, the vehicle speed of the vehicle is acquired by the various sensors 316, and the subsequent processing is repeated. In step S807, when the vehicle has finished traveling (step S807: Yes), the series of processing ends.

  As described above, according to the present embodiment, the threshold for detecting the trigger can be changed in real time according to the vehicle speed, so that it is possible to optimize the storage of the drive recorder image. In other words, it is possible to prevent unnecessary saving of the drive recorder image unrelated to the accident during high-speed traveling without losing the drive recorder image at the time of accident encounter during low-speed traveling.

  In addition, according to the present embodiment, regarding the detection of the trigger, it is possible to improve versatility by using a criterion for determining an arbitrary threshold and an arbitrary threshold (or output pattern), By combining a criterion for determining a plurality of threshold values and threshold values (or output patterns), a more accurate trigger can be detected.

  The information recording method described in the present embodiment can be realized by executing a program prepared in advance on a computer such as a personal computer or a workstation. This program is recorded on a computer-readable recording medium such as a hard disk, a flexible disk, a CD-ROM, an MO, and a DVD, and is executed by being read from the recording medium by the computer. The program may be a transmission medium that can be distributed via a network such as the Internet.

DESCRIPTION OF SYMBOLS 100 Information recording apparatus 101 Detection part 102 Determination part 103 Acquisition part 104 Comparison part 105 Storage part

Claims (4)

In the information recording apparatus for capturing the surrounding video from the moving moving body and overwriting the captured peripheral video that is continuously input,
Detecting means for detecting the behavior of the moving body and outputting the detected value;
Comparison means for comparing the output value from the detection means with a threshold value for the output value for determining whether the behavior of the moving body is a dangerous factor for the moving body;
As a result of comparison by the comparison means, if the output value exceeds the threshold value, storage means for saving the captured peripheral video,
An acquisition means for acquiring information relating to a traffic flow on a route along which the mobile body moves;
A determination unit that appropriately varies the threshold according to a traveling state of the moving body and determines the threshold for comparison with the output value by the comparison unit;
With
The determining means, based on the traffic flow acquired by the acquisition means, before the mobile body enters a different section of the traffic flow, to vary the threshold according to the different traffic flow, An information recording apparatus for determining a threshold value for comparison with the output value by a comparison means. In the information recording method for capturing the surrounding video from the moving moving body and overwriting the captured peripheral video that is continuously input,
A detection step of detecting the behavior of the moving body and outputting the detected value;
A comparison step for comparing the output value from the detection step with a threshold value for the output value for determining whether or not the behavior of the moving body is a dangerous factor for the moving body;
As a result of comparison by the comparison step, if the output value exceeds the threshold value, the storage step of saving the captured peripheral video,
An acquisition step of acquiring information relating to a traffic flow on a route along which the moving body moves;
A determination step of appropriately changing the threshold value according to a traveling state of the moving body and determining the threshold value for comparison with the output value by the comparison step;
Including
The determination step is based on the traffic flow acquired by the acquisition step, before the mobile body enters a different section of the traffic flow, to vary the threshold according to the different traffic flow, An information recording method comprising: determining a threshold value for comparison with the output value in the comparison step. An information recording program for causing a computer to execute the information recording method according to claim 2 . A computer-readable recording medium on which the information recording program according to claim 3 is recorded.

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