JP2020159741A - System, program and the like - Google Patents

Abstract

To provide a system that is superior to the conventional system such as the system and the like capable of identifying a time without requiring a manual input of information by users, under a situation where information cannot be directly acquired from any of a time server and a reception unit of a satellite positioning system in the system using a time.SOLUTION: A system 901 comprises: a drive recorder 1 that is mounted to each of a plurality of vehicles; a time recorder 2 that transmits time information to the drive recorder 1; a time server 3 that transmits the time information to the time recorder 2; and a data server 4 that stores variety of information such as attendance information and the like the drive recorder 2 generates. The drive recorder 1 is configured to receive time information indicative of a current time from the time recorder 2 by wireless communication, for example, every time a prescribed tim goes by. The drive recorder 1 includes an internal time piece, and is configured to calibrate a time the internal time piece counts, using the time information received from the time recorder 2.SELECTED DRAWING: Figure 1

Description

For example, it relates to a technique for specifying a time.

For example, there is Patent Document 1. Patent Document 1 describes a system including a drive recorder and a car navigation device (hereinafter, referred to as "car navigation") connected by a connection cable. The drive recorder acquires the reference date and time data from the car navigation system, and records the date and time data set based on the acquired reference date and time data in association with the captured image data.

Japanese Unexamined Patent Publication No. 2011-257849

Most systems that use time include an internal clock such as an RTC (Real Time Clock), and use the time measured by the internal clock. Most internal clocks measure the time based on the signals emitted by the relatively inexpensive crystal oscillator, but the period of the signal emitted by the crystal oscillator does not always match the design value, and the internal clock does not always match the design value. There is a problem that the time measured by the clock deviates from the correct time.

In addition, if the amount of electricity stored in the battery that supplies power to the internal clock is insufficient during the period when the time system is not supplied with power from the outside, the operation of the internal clock is stopped and the power supply from the outside to the system is resumed. At that time, there is a problem that the internal clock cannot measure the correct time.

As a method for solving the above inconvenience, first, a user interface such as an operation button is provided in a system using time, and the user manually inputs information indicating the time (hereinafter referred to as "time information") to the user interface. It is conceivable to perform the operation to do. In this case, the system using the time can specify and use the time by using the time information manually input by the user. However, it is troublesome for the user to manually input the time information.

As a method that does not require manual input of information by the user, for example, a system that uses time may acquire time information directly from a time server that distributes time information. As a time server, for example, a device that transmits time information in packets according to a communication protocol such as NTP (Network Time Protocol) or PTP (Precision Time Protocol, IEEE 1588), or a time server that transmits time information assuming reception by a radio clock. There are some that are modulated to and transmitted. In this case, the system using the time can specify and use the time by using the time information acquired from the time server. Further, it is conceivable that the system using the time directly acquires the time information from the receiving unit of the satellite positioning system (hereinafter, referred to as "GNSS (Global Navigation Satellite System) unit"). In this case, the system using the time can acquire the time information received from the artificial satellite by the GNSS unit from the GNSS unit, and specify and use the time using the acquired time information.

However, a system that uses time may not be able to directly acquire time information from either the time server or the GNSS unit due to, for example, physical reasons or financial reasons. For example, if the system that uses the time does not have a communication function, or if the system that uses the time cannot connect to the network belonging to the time server even if it has the communication function, the system that uses the time cannot directly acquire the time information from the time server. In addition, if the system that uses the time does not have a GNSS unit, or if the system that uses the time cannot receive radio waves from the artificial satellite due to the influence of obstacles, etc., the system that uses the time directly receives the time from the GNSS unit. Information cannot be obtained.

An object of the present invention is, for example, in a system using time, in a situation where information cannot be directly acquired from either a time server or a receiving unit of a satellite positioning system, without requiring manual input of information by a user. It is to provide a system superior to the conventional system, such as a system capable of specifying the time.

The object of the invention of the present application is not limited to this, and there is an intention to acquire rights by divisional application, amendment, etc. for a configuration for the purpose of obtaining an effect produced from a portion of the configuration disclosed in the present specification, drawings, etc. .. For example, the present specification discloses a problem in which the part described as "can be" is replaced with "is a problem" in the present specification. The issues are described as independent, and the intention is to acquire the rights to solve each issue independently by divisional application, amendment, etc. Even if the subject matter is implicitly grasped from the description in the specification, the applicant intends to make a part of the structure described in the specification amended or to be claimed in the divisional application. It also discloses a structure that solves problems that combine these independent problems, and has the intention to acquire rights.

(1) A function to acquire information for specifying the time without directly acquiring information from either the time server or the receiving unit of the satellite positioning system and without requiring the user to manually input the information. It is preferable that the system is provided with a specific means having a function of specifying the time by using the information for specifying the time.

According to the above system, the time can be specified without requiring the user to manually input the information even in a situation where the information cannot be directly acquired from either the time server or the receiving unit of the satellite positioning system.

The time server may be, for example, a server on the Internet, and particularly preferably an NTP (Network Time Protocol) server. The receiving unit of the satellite positioning system may be, for example, a GPS (Global Positioning System) receiving module. The system acquires information directly from the receiver of the time server or satellite positioning system, which means that the system receives the information transmitted or output to the system by the receiver of the time server or satellite positioning system. It is good to do. For manual input of information by the user, for example, the user may operate a physical operator such as a button or a virtual operator such as an icon displayed on a display to input the information.

The information for specifying the time may be information indicating the time itself. However, it is particularly preferable that the above-mentioned information for specifying the time is information that does not indicate the time itself. The information that does not indicate the time itself may be, for example, information that represents an image of a landscape with a clock, information that indicates the elapsed time of a 1PPS (Pulse Per Second) signal output from a receiving unit of a satellite positioning system, or the like. To specify the time, for example, it is preferable to specify the information of what time and minute.

(2) The function of the specific means for acquiring the information for specifying the time is such that the user manually inputs the information without directly acquiring the information from either the time server or the receiving unit of the satellite positioning system. It is preferable to use a system having a communication function of receiving information for specifying the time from an external system without requiring the above.

According to the above system, by using the communication function of the above system, it is necessary for the user to manually input the information even in a situation where the information cannot be directly acquired from either the time server or the receiving unit of the satellite positioning system. The time is specified without any notice.

The external system is, for example, a system that acquires information for directly specifying the time from the time server, and the above system acquires information for indirectly specifying the time from the time server via the external system. You should do it. Further, the external system may be, for example, a system including a receiving unit of the satellite positioning system, and the above system may acquire information for indirectly specifying the time from the receiving unit of the satellite positioning system via the external system. ..

The above-mentioned external system is particularly preferable to have a function of recording the time. The function of recording this time may be, for example, a function of recording the time when a predetermined event occurs. The predetermined event may be, for example, a person in a specific place, and in particular, a specific person in a specific place. The predetermined event may be, for example, a passerby passing through the ticket gate of a station. In addition, the predetermined event may be, for example, that a worker goes to work or leaves work. The external system described above may include, for example, a time recorder that records the time of arrival and departure of workers. The system may have, for example, a function of associating and storing the information generated by the processing performed by the system with the worker's work time and work time recorded by the time recorder. The information generated by the processing performed by the above system may be, for example, information representing a captured image.

It is particularly preferable that the above-mentioned external system has an internal clock and a function of correcting the time measured by the internal clock. The function of correcting the time measured by the internal clock may be, for example, a function of correcting the time by using the information indicating the time directly acquired from the time server by the external system described above. Further, the function of correcting the time measured by the internal clock is, for example, a function of correcting the time by using the information for specifying the time directly acquired by the above-mentioned external system from the receiving unit of the satellite positioning system. It is good to say. Further, the function of correcting the time measured by the internal clock may be, for example, a function of correcting the time using information for specifying the time manually input by the user. The system may acquire information indicating the corrected time from, for example, an internal clock and an external system having a function of correcting the time measured by the internal clock.

The above-mentioned external system is particularly preferable to be a mobile system. The external system may be, for example, a user's mobile terminal. The system may acquire information for specifying the time from the user's mobile terminal when the user approaches the system to a distance capable of wireless communication. For example, when the user is close to the system, the user's mobile terminal and the system establish a communication connection according to a wireless communication standard such as Bluetooth (registered trademark), and the system is used by the user via the communication connection. It is advisable to receive information for specifying the time from the mobile terminal of. For example, there are a plurality of the above systems, and each of the plurality of the above systems may acquire information for specifying the time from the same mobile terminal of an approaching user. In this case, the times specified by the plurality of systems are the times synchronized with each other.

Further, the external system may be, for example, an in-vehicle device. The system may acquire information for specifying the time from an in-vehicle device mounted on the vehicle when the vehicle approaches the system. For example, there are a plurality of the above systems, and each of the plurality of the above systems may acquire information for specifying the time from the same in-vehicle device mounted on a vehicle traveling nearby. In this case, the time specified by each of the plurality of systems is a time synchronized with each other.

(3) The function of acquiring the information for specifying the time provided by the specific means receives information for the purpose of notifying the time transmitted from the external system on the network by the communication function, and said the above. A system having a function of acquiring information for specifying the time from the information accompanying the received information is preferable.

According to the above system, by connecting to a network in which information not intended for time notification is communicated by using the communication function of the above system, the time server and the receiving unit of the satellite positioning system can be directly connected to the network. Even in a situation where information cannot be obtained, the time can be specified without requiring the user to manually input the information.

Information that is not intended to notify the time may be, for example, a message body transmitted from a Web server by communication by HTTP. For example, the system may receive a message body from a Web server by HTTP communication, and acquire information for specifying a time from an HTTP header attached to the message body. In this case, the system can specify the time by accessing the Web server.

Further, the information for specifying the time acquired from the information accompanying the information not intended to notify the time may be, for example, the transmission time of data not intended to notify the time. For example, the system may receive the message body from the Web server by HTTP communication, and acquire the transmission time of the message body as information for specifying the time from the HTTP header attached to the message body. Further, for example, the system may receive an e-mail from a mail server by communication by SMTP, and acquire the e-mail transmission time as information for specifying the time from the received e-mail. For example, the above system may receive an email from a mail server by SMTP communication and acquire information for specifying the time from the message body included in the received mail, but it is attached to the message body of the received mail. It is particularly preferable to acquire, for example, the sending time of an email from the SMTP header to be used as information for specifying the time, because it is easy to search for the information for specifying the time.

However, the protocol is not limited to HTTP and SMTP, and various protocols may be used. In particular, it is preferable to acquire the information for specifying the time from the header added to the message body in the application layer.

(4) The function of the specific means for acquiring the information for specifying the time receives information that is not addressed to the own system communicated on the network by the communication function, and does not destination the own system. The system may have a function of acquiring information for specifying the time from the information.

According to the above system, information is directly transmitted from both the time server and the receiving unit of the satellite positioning system by connecting to a network in which information not destined for the own system is communicated by using the communication function of the above system. The time can be specified without requiring the user to manually input the information even in a situation where the information cannot be obtained.

The system may, for example, receive information communicated between a plurality of external systems and acquire information for specifying the time from the information. The system may include, for example, a relay device that relays information communicated between a plurality of external systems, and may acquire information for specifying a time from the information received by the relay device.

The above system may receive information not destined for its own system communicated on the network and acquire information for specifying the time from the message body of the information, but the time may be obtained from the header attached to the message body. It is particularly preferable to acquire the information for specifying the time because it is easy to search for the information for specifying the time.

(5) The function of the specific means for acquiring the information for specifying the time has a function of acquiring information representing the captured image and acquiring information for specifying the time from the image. It should be a system.

According to the above system, information by the user can be obtained even in a situation where information cannot be directly obtained from either the time server or the receiving unit of the satellite positioning system by using the function of acquiring the information representing the image possessed by the above system. The time is specified without the need for manual input.

The system may, for example, acquire information for recognizing an image and specifying a time. The system may, for example, recognize a clock from an image and recognize the time indicated by the recognized clock. Further, the system determines, for example, whether or not the image contains information for specifying the time, and when it is determined that the image contains information for specifying the time, the time is determined from the image. It is good to get the information to identify. Further, the system includes, for example, a usage means for using the information representing the acquired image for a purpose other than specifying the time, and acquires information for specifying the time from the information representing the image used for the usage means. You should do it. The means of using the information representing the acquired image for a purpose other than specifying the time may be, for example, a recording device that records the information representing the acquired image, a video distribution device that distributes the information representing the acquired image, or the like. ..

Further, the system may be provided with, for example, a photographing means, and may acquire information representing an image photographed by the photographing means as information for specifying a time. Further, the system includes, for example, a drive recorder, photographs the scenery around the vehicle by the photographing means provided in the drive recorder, recognizes the photographed image, and determines whether or not the image includes a clock. If it is determined that the image includes a clock, the time may be specified by recognizing the time indicated by the clock. In the above system, for example, the time may be specified from an image taken when a vehicle equipped with a drive recorder travels in the vicinity of a clock.

The system may acquire information representing one image or information representing a plurality of images as information for specifying the time. In the above system, for example, the time may be specified from one image of the clock, or the time may be specified from a plurality of images of the same clock taken continuously in chronological order. May be good.

Further, the system obtains, for example, information representing a plurality of images of visible light that changes with the passage of time in accordance with the visible light communication standard as information for specifying the time, and a plurality of these images. It is good to specify the time from the image of. For example, when the user's mobile terminal emits visible light indicating the time according to the visible light communication standard, the system acquires information representing a plurality of images of the visible light emitted by the user's mobile terminal in chronological order. The time can be specified. Further, for example, the system may acquire information representing a plurality of images obtained by taking infrared rays that change with the passage of time in time series according to an infrared communication standard, and specify the time from these plurality of images. In addition, the system acquires, for example, information representing a plurality of images of infrared rays emitted from an infrared remote controller in time series in response to an input operation of a numerical value indicating the time by the user, and obtains the time from these plurality of images. It should be specified. Further, for example, the above system does not have a dedicated light receiving means for visible light communication or infrared communication, but has a photographing means, and emits visible light or infrared rays emitted from an external system in accordance with the standards of visible light communication or infrared communication. It is particularly preferable to shoot by a shooting means and specify the time based on the shot image.

(6) The function of acquiring the information for specifying the time provided by the specific means is a function of acquiring information representing the picked-up sound and acquiring information for specifying the time from the sound. It is good to have a system.

According to the above system, information by the user can be obtained even in a situation where information cannot be directly obtained from either the time server or the receiving unit of the satellite positioning system by using the function of acquiring the information representing the sound possessed by the above system. The time is specified without the need for manual input.

The system may, for example, acquire information representing a voice uttered by a person and recognize information for specifying a time from the voice. In this case, for example, when the user utters the time, the time is specified in the system. Further, the system may be provided with, for example, a sound picking means, and may acquire information for specifying a time from the sound picked up by the sound picking means.

(7) The function of acquiring the information for specifying the time provided by the specific means is a function of acquiring the information for specifying the time in a format that the device can recognize with higher accuracy than humans can recognize. It is good to have a system.

According to the above system, for example, even in a situation where information cannot be directly acquired from either the time server or the receiving unit of the satellite positioning system, the time can be specified without requiring the user to manually input the information. As information, the time is specified with higher accuracy than when the system acquires information in a format that is easy for humans to recognize, such as an image of a clock, an image showing characters, and a voice that utters the time.

The system may, for example, acquire information representing a barcode, decode the barcode, and acquire information for specifying a time. Further, the system may, for example, acquire information representing a sound modulated according to an acoustic coupler standard, demodulate the sound, and acquire information for specifying a time.

(8) The function of the specific means for acquiring the information for specifying the time is for acquiring the information for specifying the time together with the information for error detection and correction, and for the error detection and correction. When an error in the information for specifying the time is detected by using the information, the system may have a function of correcting the error by using the information for the error detection and correction.

According to the above system, it is not possible to directly acquire information from either the time server or the receiving unit of the satellite positioning system, and information for identifying a time that may contain an error is acquired. Even under the circumstances, the time can be specified with high accuracy without requiring the user to manually input the information.

The system acquires, for example, an image representing a two-dimensional code accompanied by information for error detection and correction such as a QR code (registered trademark) as information for specifying the time, and decodes the two-dimensional code. It is advisable to specify the time using the obtained information.

(9) The function of acquiring the information for specifying the time provided by the specific means has a function of acquiring a plurality of varying pieces of information for specifying the time, and the time provided by the specific means. The function of specifying the time may be a system having a function of specifying the time by using a plurality of information for specifying the time with variations.

According to the above system, even if there are variations in the information for specifying the individual time acquired by the above system, a probable time can be specified by using a plurality of pieces of information.

The system may specify, for example, statistical values of information for identifying a plurality of varying times, and specify the time using the statistical values. This statistical value may be, for example, an average value. Moreover, this statistical value should be the mode value. Further, the system removes outliers from the information for identifying a plurality of varying times, and specifies statistical values of information for identifying a plurality of varying times that do not include the outliers. , It is particularly preferable to specify the time using the statistical value.

Further, the system obtains, for example, information representing a plurality of images in which different clocks are shown as information for specifying the time, recognizes the time from each of the plurality of images, and recognizes a plurality of recognized images. It is advisable to specify the time statistics as the time.

(10) The function of having an oscillator that emits a signal at a predetermined cycle, including an internal clock that measures the time based on the signal emitted by the oscillator, and the function of acquiring the information for specifying the time provided by the specific means is provided. The specific means has a function of acquiring information indicating a difference between the predetermined cycle and a reference cycle as information for specifying the time, and the specific means uses the information indicating the difference to use the internal clock. It is preferable to use a system having a function of correcting the time measured by the clock.

According to the above system, in a situation where information cannot be directly acquired from either the time server or the receiving unit of the satellite positioning system, between the period of the signal actually emitted by the oscillator of the internal clock and the reference period. Even if there is a difference in the time, the time is specified with high accuracy based on the time measured by the internal clock without requiring the user to manually input the information.

The above internal clock may be, for example, an RTC (Real-Time Clock). The information indicating the above period may be, for example, information specified by using a 1PPS signal emitted by the receiving unit of the satellite positioning system at a period of 1 second. The above-mentioned function of acquiring information for specifying the time is a function of acquiring information indicating a cycle stored in a storage means such as a memory by reading the information indicating the cycle as information for specifying the time from the storage means. It is good to have.

For example, when the reference frequency of the signal emitted by the oscillator of the internal clock is X (kHz) and the frequency of the signal actually emitted by the oscillator specified using the 1PPS signal is Y (kHz), the above The function to acquire the information for specifying the time of the system acquires the information indicating the X / Y value as the information for specifying the time, and the above system uses the X / Y value to set the internal clock. It is preferable to have a function to correct the time to be measured.

(11) The oscillator is provided with a measuring means for measuring a physical quantity that affects the period in which the oscillator emits a signal, and a function for acquiring information for specifying the time is a function corresponding to the physical quantity measured by the measuring means. It is preferable to use a system having a function of acquiring information indicating a period in which the signal is emitted as information for specifying the time.

According to the above system, in a situation where information cannot be directly acquired from either the time server or the receiving unit of the satellite positioning system, between the period of the signal actually emitted by the oscillator of the internal clock and the reference period. Even if there is a difference in the time and the difference is affected by changes in the physical quantity of the environment in which the oscillator is placed, high accuracy based on the time measured by the internal clock without the need for manual input of information by the user. The time is specified by.

The physical quantity that affects the period in which the oscillator emits a signal may be, for example, temperature. The above system is equipped with, for example, a thermometer, measures the current temperature with a thermometer, acquires information indicating a cycle in which the oscillator emits a signal according to the measured temperature, and uses the cycle to generate an internal clock. It is advisable to correct the time to be measured.

(12) The function of acquiring the information for specifying the time is the first function to be acquired, and the specific means is the function of acquiring the information for directly specifying the time from the time server, the satellite positioning system. A function to acquire information for directly specifying the time from the receiving unit of the above, and a function to acquire one or more of the functions for acquiring information for specifying the time manually input by the user. The function of correcting the time measured by the internal clock may be a system having a function of correcting the time measured by the internal clock using the information acquired by the second acquisition function.

According to the above system, the information for specifying the time directly acquired from either the time server or the receiving unit of the satellite positioning system by the second acquisition function, or the time manually input by the user is obtained. Based on the time measured by the internal clock corrected using the identification information, the time is specified with high accuracy even in a situation where the second acquisition function cannot be used.

The second acquisition function described above is, for example, a function of acquiring information indicating the current time manually input by the user, and the function of correcting the time measured by the internal clock described above obtains the current time. It is preferable to have a function of correcting the time measured by the internal clock by using the indicated information. Further, the above-mentioned second acquisition function has, for example, a function of acquiring a 1PPS signal emitted by a receiving unit of a satellite positioning system, and the above-mentioned first acquisition function uses, for example, the 1PPS signal. The function of acquiring information indicating the period at which the oscillator emits a signal as information for specifying the time and correcting the time measured by the above-mentioned internal clock is, for example, a function of the internal clock using the period. It is preferable to have a function of correcting the time to be measured.

(13) A transmission means for transmitting at least one of the information for specifying the time and the information indicating the time specified by using the information for specifying the time to an external system as the information for specifying the time. It is preferable to use a system equipped with.

According to the system, the time is synchronized between the system and the external system.

For example, a system having the same configuration as the above system may be the above external system. Further, a plurality of systems having the same configuration as the above system may be the above external system. In this case, time synchronization is performed between the system and a plurality of systems having the same configuration as the system.

For example, when the system is an in-vehicle device and a plurality of vehicles equipped with the system are parked in a parking lot or the like, the system mounted on the first vehicle specifies the time from an external system. The information for specifying the time is acquired, the time is specified using the information, and the information indicating the specified time is transmitted to the above system mounted on the second vehicle as the information for specifying the time. The time is specified by using the information for specifying the time received from the system mounted on the first vehicle by the system mounted on the second vehicle, and the information indicating the specified time is used as the time. By sequentially communicating information for specifying the time between the plurality of the systems, such as transmitting the information for specifying to the system mounted on the third vehicle, the plurality of the above It is good to identify the time when the system was synchronized.

(14) It is assumed that the above system is a first system, a plurality of first systems are provided, and each of the plurality of first systems is a second system that acquires information for specifying a time from the same information source. Good.

According to the second system, time synchronization is performed between the plurality of first systems.

It is preferable that each of the plurality of first systems included in the second system acquires, for example, information for specifying a time emitted from the same information source within a predetermined period. Further, the spatial reachable range of information emitted from an information source is limited, and when a plurality of first systems existing within the reachable range acquire information for specifying a time from the same information source. Good. For example, a plurality of first systems are a plurality of in-vehicle devices (for example, a drive recorder) mounted on the same vehicle, and the information source is a passenger of the vehicle or a mobile terminal (for example, a smartphone) of the passenger. Then, a plurality of first systems (for example, a drive recorder) pick up a sound indicating the time when the passenger utters in the vehicle or a sound indicating the time when the passenger's mobile terminal (for example, a smartphone) sounds in the vehicle. It is preferable to specify the time from the sound or the sound picked up by each of the plurality of first systems (for example, the drive recorder). Further, for example, a plurality of first systems may be a plurality of network cameras arranged in the same room, and the information source may be a clock (for example, a time display unit of a time recorder) arranged in the room. The time may be specified from the images taken by each of the first systems (network cameras) on the same clock.

(15) An output means for which the system is the first system and the information for specifying the time acquired by the first system is output in a format that can be recognized by the device with higher accuracy than human recognition. It is preferable to use a third system to be provided.

According to the third system, for example, as information for specifying the time, it is compared with the case of outputting information in a format that is easy for humans to recognize, such as an image of a clock, an image showing characters, and a voice that utters the time. Then, the time is specified with high accuracy in the first system.

For example, the first system may be a drive recorder, and the third system may be a user's mobile terminal. For example, the user's mobile terminal, which is the third system, displays a QR code indicating the time, and the drive recorder, which is the first system, captures the QR code displayed on the user's mobile terminal, and captures the captured image. It may be acquired as information for specifying the time, and the QR code may be decoded to specify the time. For example, the user's mobile terminal, which is the third system, produces a sound indicating the time according to the pitch, and the microphone built in the drive recorder, which is the first system, picks up the sound produced from the user's mobile terminal. , Information representing the picked up sound may be acquired as information for specifying the time, and the time may be specified from the pitch of the sound.

(16) A fourth system including the first system and the third system may be used.

According to the fourth system, even in a situation where information cannot be directly acquired from either the time server or the receiving unit of the satellite positioning system in the first system, the user must manually input the information. Instead, for example, the time is more accurate than when information in a format that is easy for humans to recognize, such as a clock image, an image showing characters, and a voice that utters the time, is used as information for specifying the time. Is identified.

(17) A third system, wherein the system is a first system, and a third system includes an output means for outputting information for specifying the time acquired by the first system as information accompanied by information for error detection and correction. It should be a system.

According to the third system, for example, even in a situation where there is a possibility that an error may occur in the information transmission path from the third system to the first system, the accuracy is high in the first system. The time is specified with accuracy.

(18) A fourth system including the first system and the third system may be used.

According to the fourth system, in the first system, information cannot be directly acquired from either the time server or the receiving unit of the satellite positioning system, and the information transmission route for specifying the time is obtained. Even in a situation where there is a possibility that an error may occur in the information, the time can be specified with high accuracy without requiring the user to manually input the information.

(19) The computer may be a program for functioning as a specific means provided in the system.

According to the above program, the time is specified without requiring the user to manually input the information even in a situation where the information cannot be directly acquired from either the time server or the receiving unit of the satellite positioning system using a computer. The system is realized.

(20) The computer may be a program for functioning as an output means included in the third system.

According to the above program, even in a situation where the first system cannot directly acquire information from either the time server or the receiving unit of the satellite positioning system using a computer, the user can manually input the information. A third system is realized that enables the time to be specified with high accuracy without requiring it.

The inventions shown in (1) to (20) above can be arbitrarily combined. For example, the configuration may be such that at least a part of the configuration of at least one invention after (2) is added to all or part of the configuration of the invention shown in (1). In particular, the invention shown in (1) may be an invention in which at least a part of at least one of the inventions after (2) is added. Further, an arbitrary configuration may be extracted from the inventions shown in (1) to (20), and the extracted configurations may be combined. The applicant of the present application intends to acquire rights to an invention including these configurations. Further, even if there is a description of "in the case of" or "in the case of", it is not described as a configuration limited to that case or at that time. These show examples of better configurations and are willing to acquire rights in these cases and in occasional configurations. In addition, the places where the description is accompanied by an order are not limited to this order. It also discloses a configuration in which some parts have been deleted or the order has been changed, and has the intention of acquiring rights.

The user does not have to manually input the information in order to have the system specify the time in a situation where the information cannot be directly acquired from either the time server or the receiving unit of the satellite positioning system.

The effect of the invention of the present application is not limited to this, and the effect exerted from the part of the configuration disclosed in the present specification, drawings, etc. Have the intention to do. For example, in the present specification, the part described as "can be" is a description that clearly indicates the effect to be exerted, and there is a part that shows the effect even if there is no description of "can be". Moreover, even if there is no such description, there is an effect that can be grasped by the configuration.

The figure which showed the whole structure of the system which concerns on one Embodiment. The figure which showed the appearance of the drive recorder which concerns on one Embodiment. The figure which showed the internal structure of the drive recorder which concerns on one Embodiment. The figure which showed the internal structure of the time recorder which concerns on one Embodiment. An example of a moving image playback screen displayed on a display device connected to the terminal device according to the embodiment. An example of a playback screen in a system according to a modification of an embodiment. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment. The figure which showed the example of the processing sequence performed by the drive recorder and the tablet PC which concerns on one modification of one Embodiment. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment. The figure which showed the whole structure of the system which concerns on one Embodiment. An example of response information received from the HTTP server by the drive recorder according to the embodiment. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment. An example of information received by a time recorder according to a modification of the embodiment. The figure which showed the whole structure of the system which concerns on one Embodiment. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment. The figure for demonstrating the mechanism which the tablet PC transmits time information in the system which concerns on one modification of one Embodiment. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment. The figure which showed the state which the drive recorder which concerns on one modification of one Embodiment is mounted on a vehicle, is used. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment. The figure which showed the state which the drive recorder which concerns on one modification of one Embodiment is mounted on a vehicle, is used. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment. The figure which showed the whole structure of the system which concerns on one Embodiment. The figure which showed the whole structure of the system which concerns on one modification of one Embodiment.

[First Embodiment]
FIG. 1 is a diagram showing an overall configuration of a system 901 including a drive recorder 1 which is a system according to the first embodiment of the present invention. The system 901 is information for specifying the time for each of the drive recorder 1 mounted on each of the plurality of vehicles under the control of the vehicle operating company (for example, a taxi company, a bus company, etc.) and the drive recorder 1. A time recorder 2 (an example of the same information source) that transmits (hereinafter referred to as "time information"), a time server 3 that transmits time information to the time recorder 2, and attendance generated by the time recorder 2. A data server 4 for storing various information such as information is provided.

As an example, FIG. 1 shows a total of two drive recorders 1 mounted on each of a vehicle identified by a vehicle ID (Identifier) “0001” and a vehicle identified by a vehicle ID “0002”. However, the number of drive recorders 1 constituting the system 901 varies depending on the number of vehicles using the system 901.

The drive recorder 1 and the time recorder 2 wirelessly communicate with each other according to a communication protocol such as WiFi (registered trademark) or Bluetooth (registered trademark). For example, when the power of the vehicle is turned on, the drive recorder 1 receives electric power from the battery of the vehicle and starts operating. The drive recorder 1 attempts to establish a communication connection with the time recorder 2 at the start of operation and every time a predetermined time (for example, 10 seconds) elapses during the operation, and when the communication connection is established, the current time is displayed from the time recorder 2. Receives time information indicating. The drive recorder 1 includes an internal clock, calibrates the time measured by the internal clock using the time information received from the time recorder 2, and specifies the time after calibration as the current time. Therefore, when the driver of the vehicle turns on the power of the vehicle parked in the office, or when the driver drives the vehicle from outside the office and moves into the office, the drive recorder 1 uses the user. The time information is received from the time recorder 2 and the time measured by the internal clock is calibrated without requiring the operation of.

The time recorder 2 and the time server 3 can communicate by wire (for example, Ethernet (registered trademark) or the like) or wirelessly (for example, WiFi or the like). The time server 3 is located outside the office of the vehicle operating company, for example, and communicates with the time recorder 2 via a WAN such as the Internet. The time server 3 includes, for example, a GNSS (Global Navigation Satellite System) receiver, and wirelessly receives time information indicating the current time measured by an atomic clock mounted on the artificial satellite from the artificial satellite. , Send the received time information to an external device. The time server 3 transmits the time information to an external device using, for example, NTP (Network Time Protocol).

The time recorder 2 and the data server 4 can communicate with each other by wire or wirelessly. The data server 4 is installed in, for example, the office of a vehicle operating company, and communicates with the time recorder 2 via a LAN.

FIG. 2 is a diagram showing the appearance of the drive recorder 1. The drive recorder 1 is provided with a cylindrical main body 11, and a mounting bracket 12 is attached to one end side of the main body 11 in the axial direction. The main body 11 is configured by abutting the first case 111 and the second case 112, which are divided into two (half) in the front and rear. The outer dimensions of the one end portion 1111 of the first case 111 and the one end portion 1121 of the second case 112 are formed to be one size smaller, and a male screw portion is formed on the outer peripheral surface of the tip thereof. Further, a stepped surface based on the difference in outer diameter is formed between the one end portion 1111 and the one end portion 1121 and the central portion in the axial direction of the main body 11.

The mounting bracket 12 includes a ring portion 121 having an inner diameter that substantially matches (slightly larger) the outer diameter of one end portion 1111 of the first case 111 and one end portion 1121 of the second case 112, and a mounting plate 122. It is provided with a connecting pillar portion for connecting the above. The mounting plate 122 is arranged so as to be inclined at a predetermined angle with respect to the diameter direction of the ring portion 121. Then, an adhesive member such as a double-sided adhesive tape is attached to the attachment surface 1221 of the attachment plate 122, and is fixed to the windshield of the vehicle via the adhesive member.

With the ring portion 121 attached to the one end portion 1111 and the one end portion 1121 of the main body 11, the nut member 13 is attached to the male screw portion formed on the outer peripheral surfaces of the one end portion 1111 and the one end portion 1121. The nut member 13 has a flat disk-shaped cap shape, and a female threaded portion matching the male threaded portion is formed on the inner peripheral surface thereof. By tightening the nut member 13, both sides of the ring portion 121 in the axial direction are sandwiched and fixed between the nut member 13 and the above-mentioned stepped surface of the main body 11. As a result, when the ring portion 121 is attached to the one end portion 1111 of the first case 111 and the one end portion 1121 of the second case 112, the ring portion 121 has its central axis before being firmly fastened by the nut member 13. As the center of rotation, the rotation can be performed in the forward and reverse directions relative to the one end 1111 of the first case 111 and the one end 1121 of the second case 112. Then, by tightening the nut member 13 in a state where the relative angle positions of the two are desired, the mounting bracket 12 can be fixed in a state of an arbitrary relative angle position. If triangular wavy (saw blade-shaped) tooth portions are provided on the stepped surface of the main body 11 and the side surface of the ring portion 121 facing the step surface, the tooth portions are engaged with each other and can be firmly fixed.

As described above, the drive recorder 1 is adhered and fixed to the windshield of the vehicle by using double-sided tape (not shown) or other adhesive member attached to the upper surface of the mounting plate 122. Therefore, the drive recorder 1 of the present embodiment can be adjusted according to the angles (25 to 75 degrees) of various windshields. That is, the mounting plate 122 is parallel to the angle of the windshield, but as described above, the relative angle of the main body 11 with respect to the mounting plate 122 (mounting bracket 12) can be adjusted, so that the angle of the mounting plate 122 (windshield) Regardless of, the basic vertical direction of the main body 11 can be made parallel to, for example, a vertical plane (relative to the ground). Of course, the angle formed by the main body 11 in the basic vertical direction and the vertical plane with respect to the ground can be set to an appropriate angle. Therefore, one drive recorder 1 can be mounted on different types of vehicles.

Further, a circular through hole 131 is formed in the central portion of the nut member 13. From the through hole 131, the tip surfaces of the one end portion 1111 of the first case 111 and the one end portion 1121 of the second case 112 are exposed to the outside, and the volume dial 14, the DC jack 15, etc. are exposed on the exposed portions of the tip surfaces. The one to be operated by the user is provided. By adopting such a configuration, it is possible to install the operation target in the limited space of the main body 11, and as a result of attracting the user's attention during the operation, it is possible to easily confirm whether the nut member 13 is loose. ..

By attaching a DC plug (not shown) attached to one end of a power cable connected to a cigar socket, for example, the drive recorder 1 of the present embodiment can supply power from a vehicle battery to the DC jack 15. And. In this way, since the power cable is pulled out from the side of the main body 11, the power cable can be hidden in the room mirror by attaching a drive recorder to the side or the vicinity of the room mirror, which makes it look beautiful. be able to. Further, by receiving power supply from the vehicle side via the DC jack 15, the drive recorder 1 can be used alone.

Further, the CCD camera 16 is installed in the first case 111 in an exposed state. The CCD camera 16 captures the front of the vehicle. Further, although not shown, it is preferable that the microphone is built in the main body 11. The surrounding sound can be picked up by the microphone.

Further, the other end of the main body 11 is provided with an interface for connecting a connection cable for exchanging information with an external device and a slot portion for an SD memory card.

FIG. 3 is a diagram showing the internal structure of the drive recorder 1. The drive recorder 1 further includes an accident detection sensor 101, a temporary storage memory 102, an internal clock 103, a speaker 104, a switch 105, a microphone 106, a control unit 107, and an interface 108 in the main body 11. The accident detection sensor 101 is realized by an impact detection sensor such as an acceleration sensor. When a certain impact (acceleration) is detected, it is assumed that there is an accident (collision). Further, by appropriately setting a constant impact threshold value, it is possible to output a detection signal not only when an accident occurs but also when sudden braking or sudden steering is performed.

The temporary storage memory 102 is, for example, a RAM that temporarily stores image data captured by the CCD camera 16, and is designed to constantly store image data captured at least from the present to the past for a certain period of time or more. However, since the storage capacity is finite, old image data is deleted based on a certain standard. A certain standard can be, for example, an image data stored before a certain time or a certain amount of memory capacity to be stored. In the present embodiment, the temporary storage memory 102 is configured by a ring buffer.

The speaker 104 is notified of, for example, the operation sound of the switch 105 and various messages (guides, alarms, etc.). The volume dial 14 adjusts the output level of the speaker 104.

Further, the control unit 107 is a microcomputer provided with a CPU, ROM, RAM, non-volatile memory, I / O, etc., and executes a predetermined process based on the information input from the above-mentioned various input devices to output the output device. Use to output predetermined information. The function of the drive recorder 1 is realized by being stored in the EEPROM of the control unit 107 as a program executed by the computer included in the control unit 107 and executed by the computer having the control unit 107.

The functions realized by the computer by the program included in the control unit 107 include an image recording function, an image output function, and an internal clock calibration function.

The control unit 107 is a circuit for realizing the basic functions of the drive recorder, and stores the video (image data) taken by the CCD camera 16 as a video file in the temporary storage memory 102 or from the accident detection sensor 101. Based on the detection signal, the captured image data (video file) is stored in the non-volatile memory. In this embodiment, as the non-volatile memory, a memory card 17 (for example, an SD memory card) mounted in the card slot 109 (for example, a slot for an SD memory card) is used. By removing the memory card 17 and attaching it to a memory card reader or the like connected to a personal computer, data can be taken into the personal computer. Further, the recorded video or the like is not limited to being taken out to the outside by attaching and detaching the memory card 17 (recording medium) as described above, but can be performed by wired / wireless communication (data transmission). Further, in order to perform wired communication, it is preferable that the main body is provided with a connector, USB, or the like for connecting a communication cable.

To explain the image recording function for recording this image data in more detail, the CCD camera 16 constantly images the vehicle and surrounding conditions from the driver's viewpoint (field of view), and the captured image data is used in a ring buffer or the like. It is stored in the temporary storage memory 102. The video stored in the temporary storage memory 102 is sequentially updated to the latest one, and the past video data is retained for a set time.

When the accident detection sensor 101 detects an impact generated during an accident, sudden braking, or sudden steering (the output value of the sensor exceeds the threshold value), a certain period of time before the time when the threshold value is exceeded (impact detection) The image data (video) is read from the temporary storage memory 102 and stored in the non-volatile memory (memory card 17), and after the threshold is exceeded, the image of the CCD camera 16 captured thereafter is directly or temporarily stored in the memory card 17. By recording via the storage memory 102, images for a predetermined time before and after the impact are stored in the memory card 17 which is a non-volatile memory. At this time, if the microphone 106 is built in, the surrounding sound picked up by the microphone 106 is also recorded in association with the image data. This recording is also temporarily stored in the temporary storage memory 102, and when the image data is stored in the memory card 17, the recorded audio data is also stored in the memory card 17. It is preferable to add audio together with the video because it increases the sense of presence.

The internal clock 103 has, for example, an RTC and continuously clocks the current time. The interface 108 is an interface for communicating with an external device. In the present embodiment, the drive recorder 1 communicates with the time recorder 2 via the interface 108.

FIG. 4 is a diagram showing the internal structure of the time recorder 2. The time recorder 2 includes a display unit 21, an operation button 22, a reading unit 23, a printing unit 24, an internal clock 25, an interface 26, and a control unit 27. Further, the main body of the time recorder 2 is provided with a slit for inserting the time card into the time recorder 2 when the user stamps the time card.

The display unit 21 is, for example, a liquid crystal display, and displays information such as the current time. The operation button 22 is a button that accepts a user's operation. The operation button 22 may be a physical button or a virtual button displayed on the touch screen. At the time of stamping on the time card, the user operates the operation button 22 to input to the time recorder 2 whether the stamping corresponds to attendance, leaving work, or the like.

The reading unit 23 is, for example, an optical scanner, and reads a driver ID (for example, an employee number) that identifies the driver, which is pre-printed on the time card. The driver ID printed on the time card may be characters or the like that can be identified by a human being, or may be an image such as a barcode that is easy for the reading unit 23 to read.

The printing unit 24 is, for example, a thermal transfer printer, and prints (stamps) the current time measured by the internal clock 25 on a time card inserted in the time recorder 2. The internal clock 25 has, for example, an RTC and continuously clocks the current time.

The interface 26 is an interface for communicating with an external device. In the present embodiment, the time recorder 2 communicates with each of the drive recorder 1 and the time server 3 and the data server 4 via the interface 26.

The control unit 27 is a computer including a processor and a memory, and the processor performs data processing according to a program stored in the memory to control the operation of each component of the time recorder 2 and realize various functions of the time recorder 2. .. The functions realized by the control unit 27 include a function of calibrating the current time measured by the internal clock 25 using the time information received from the time server 3, and a function of displaying the current time measured by the internal clock 103 on the display unit 21. , The current time measured by the internal clock 25 is printed at a predetermined position of the time card inserted in the time recorder 2 (a position determined according to the current date and the attendance / departure specified by the user by operating the operation button 22). There is a function of printing by the unit 24, a function of transmitting attendance information for each driver specified by stamping on the time card to the data server 4 by the interface 26 and the like.

The data server 4 has, for example, a vehicle / drive recorder correspondence table that stores information indicating the correspondence between the vehicle and the drive recorder 1, a vehicle allocation database that stores information indicating the allocation of the vehicle to the driver, and the driver's. The attendance database that stores attendance information is stored.

The information stored in the vehicle / drive recorder correspondence table indicates which drive recorder 1 is installed in which vehicle. The vehicle / drive recorder correspondence table stores records for each vehicle, and each record identifies, for example, a vehicle ID (for example, a vehicle number) that identifies a vehicle and a drive recorder 1 mounted on the vehicle. The drive recorder ID (for example, the serial number of the drive recorder 1) is stored. The information stored in the vehicle / drive recorder correspondence table is, for example, input to the terminal device by the manager of the vehicle operating company and transmitted from the terminal device to the data server 4.

The information stored in the vehicle allocation database indicates which driver each vehicle is assigned to in which time zone. The vehicle allocation database is, for example, a collection of allocation tables for each vehicle identified by a vehicle ID, and the allocation table is, for example, "○○ year ○○ month ○○ day ○○ hour ○○ minute to ○○ year ○○. Records for each time zone such as "month XX day XX hour XX minute" are stored, and each record identifies, for example, information indicating the time zone and the driver to whom the vehicle is assigned in that time zone. Store the person ID (for example, employee number). The information stored in the vehicle allocation database is, for example, input to the terminal device by the administrator of the vehicle operating company and transmitted from the terminal device to the data server 4.

The information stored in the attendance database indicates at what time each driver was working. The attendance database is, for example, a collection of attendance tables for each driver identified by the driver ID, and the attendance table is, for example, for each time such as "○○ year ○○ month ○○ day ○○ hour ○○ minute". Records are stored, and each record stores, for example, information indicating a time and information indicating which state the driver's attendance state has changed at that time (for example, attendance, leaving work, etc.). The information stored in the attendance database is a collection of information transmitted by the time recorder 2 to the data server 4 each time the driver inserts the time card into the time recorder 2.

As described above, each of the drive recorders 1 stores information (hereinafter referred to as sounded moving image information) in which the image (moving image) taken by the own device by the CCD camera 16 and the sound picked up by the microphone 106 are associated with each other. Store in card 17. The moving image information with sound includes still image information representing a still image taken at a predetermined cycle (for example, 1/30 second or the like) as information representing a moving image. When the drive recorder 1 stores these still image information, the drive recorder 1 receives time information indicating the current time measured by the internal clock 103 at the time when the still image is taken by the CCD camera 16 and the vehicle is assigned at that time. The work status information indicating the driver's work status (during work, non-work, etc.) is stored in association with the still image information. Hereinafter, the drive recorder 1 shall store the time information and the work status information in the form of including the sound video information, but at least one of the time information and the work status information is used as information different from the sound video information. You may remember.

As mentioned above, for example, when the driver of the vehicle turns on the power of the vehicle parked in the office, or when the driver drives the vehicle from outside the office and moves into the office. The drive recorder 1 and the time recorder 2 mounted on the vehicle establish a wireless communication connection.

When the drive recorder 1 establishes a communication connection with the time recorder 2, the drive recorder 1 transmits a drive recorder ID that identifies the own device to the time recorder 2.

When the time recorder 2 receives the drive recorder ID from the drive recorder 1, it first refers to the vehicle / drive recorder correspondence table and identifies the vehicle equipped with the drive recorder 1 identified by the received drive recorder ID. To identify. Subsequently, the time recorder 2 refers to the vehicle allocation database and identifies the driver ID that identifies the driver to whom the vehicle identified by the identified vehicle ID is assigned at that time. Subsequently, the time recorder 2 reads the latest attendance information of the driver identified by the specified driver ID from the attendance database. Subsequently, the time recorder 2 includes the specified vehicle ID, the driver ID, and the work status information indicating the driver's current working status (for example, during work, out of work, etc.) indicated by the attendance information read from the attendance database. , The time information indicating the current time clocked by the internal clock 25 at that time is transmitted to the drive recorder 1.

The drive recorder 1 stores the vehicle ID, the driver ID, and the work status information received from the time recorder 2 in the memory of the control unit 107. Further, the drive recorder 1 calibrates the time measured by the internal clock 103 of its own device by using the time information received from the time recorder 2. For example, in the drive recorder 1, the internal clock 103 clocks the current time indicated by the time information received from the time recorder 2 and the time before the time when the time information is received by a predetermined time required for generation and transmission / reception of the time information. Calculate the time difference from the current time that was set, and add or subtract the time difference to the current time clocked by the internal clock 103 (when the internal clock 103 is behind the internal clock 25) or subtract (the internal clock 103 advances from the internal clock 25). By (if any), the current time after calibration is measured. That is, the drive recorder 1 includes a specific means for specifying the current time using time information.

After that, the drive recorder 1 stores the still image information representing the still image taken by the CCD camera 16, the time information indicating the current time after calibration measured by the internal clock 103, and the memory of the control unit 107. By accumulating the latest vehicle ID, driver ID, and work status information in association with each other, moving image information representing a moving image is generated. The drive recorder 1 generates sound-attached moving image information by associating the moving image information generated in this way with sound information representing the sound picked up by the microphone 106 so as to synchronize on the time axis. The time information indicating the current time after calibration may be stored in, for example, the memory card 17 as information different from the sound-attached moving image information, or may be stored in the frame of the sound-attached moving image information, the header (or the footer). ) Or in the management area (for example, setting file, log file, etc.).

The manager of the vehicle operating company removes the memory card 17 of the drive recorder 1 mounted on the vehicle parked in the company's parking lot from the card slot 109, and is internally or externally connected to a terminal device such as a personal computer. The memory card 17 is inserted into the card reader, and the moving image information with sound stored in the memory card 17 is moved to the memory of the terminal device. After that, the manager of the vehicle operating company returns the memory card 17 to the card slot 109 of the drive recorder 1.

The terminal device has a function of displaying a moving image represented by the moving image information with sound moved to the memory of the own device by, for example, a display device (for example, a liquid crystal display or the like) internally or externally connected to the terminal device. FIG. 5 is an example of a moving image playback screen displayed on a display device connected to a terminal device used by an administrator of a vehicle operating company. As shown in FIG. 5, on the reproduction screen, the moving image taken by the CCD camera 16 is reproduced and displayed. Further, on the playback screen, the vehicle ID of the vehicle in which the currently displayed image was shot, the time when the image was shot (shooting time), and the driving of the driver who was driving the vehicle at the shooting time The person ID (for example, employee number) and the working status of the driver are displayed.

The shooting time displayed on the playback screen is the current time measured by the drive recorder 1 by the internal clock 103, and the current time measured by the internal clock 103 is the current time calibrated using the time information transmitted from the time recorder 2. It is the time. Therefore, the current time measured by the drive recorder 1 by the internal clock 103 and the current time measured by the time recorder 2 by the internal clock 25 are substantially synchronized. Therefore, according to the system 901, there is an inconvenience that the wrong shooting time, driver ID, or working status is displayed on the playback screen due to the deviation of the current time measured by the internal clocks of the drive recorder 1 and the time recorder 2. Does not occur.

(Modified example of the first embodiment)
(1-1)
In the system 901 described above, the time information stored in association with the still image information included in the moving image information with sound by the drive recorder 1 is the current time measured by the internal clock 103, using the time information received from the time recorder 2. The calibrated one is shown. The drive recorder 1 may store the time information indicating the current time before calibration in addition to the current time after time counting and calibration by the internal clock 103 in association with the still image information included in the moving image information with sound. ..

FIG. 6 is an example of a playback screen in the system 901 according to this modified example. In this modified example, as shown in FIG. 6, two shooting times, "shooting time (standard)" and "shooting time (time recorder)", are displayed on the playback screen. The shooting time (standard) is the current time before calibration measured by the internal clock 103 at the time of shooting the still image, and the shooting time (time recorder) is timed by the internal clock 103 at the time of shooting the still image. This is the current time after the current time before calibration is corrected by adding or subtracting the time difference between the clocks of the internal clock 103 and the internal clock 25.

According to this modification, for example, the manager of the vehicle operating company can easily confirm that the shooting time included in the sound-attached moving image information has not been arbitrarily changed.

(1-2)
In the system 901 described above, the drive recorder 1 receives the driver ID and the work status information from the time recorder 2, and stores them in association with the still image information included in the moving image information with sound. The time recorder 2 does not transmit the driver ID and working status information to the drive recorder 1, and the drive recorder 1 does not store the driver ID and working status information in association with the still image information included in the video information with sound. You may.

In this modification, the drive recorder 1 includes, for example, the drive recorder ID of the own device that captured the image in the header information of the moving image information with sound. Then, the terminal device used by the manager of the vehicle operating company is associated with the drive recorder ID included in the header information of the video information with sound to be reproduced and the still image to be displayed, for example, when displaying the reproduction screen. The time information indicating the shooting time is transmitted to the data server 4, and as a response, the vehicle ID of the vehicle in which the still image was shot and the vehicle when the shooting was performed are received from the data server 4. Receives the driver ID of the driver and information indicating the working status of the driver. The terminal device used by the manager of the vehicle operating company displays the vehicle ID, the driver ID, and the working status indicated by the information received from the data server 4 on the playback screen (see FIG. 5).

According to this modification, the data format of the moving image information with sound generated and stored by the drive recorder 1 does not need to be a data format that can store the vehicle ID, the driver ID, and the work status information.

(1-3)
In the system 901 described above, the type of device that acquires the time information indicating the current time as the information for specifying the time from the time recorder 2 and calibrates the current time measured by the internal clock using the acquired time information is a drive. It is a recorder. The type of device that acquires time information from the time recorder 2 is not limited to the drive recorder.

FIG. 7 is a diagram showing the overall configuration of the system 902 according to an example of this modification. The system 902 includes a plurality of surveillance cameras 5 in place of the plurality of drive recorders 1 included in the system 901. The time recorder 2, the data server 4, and the surveillance camera 5 of the system 902 are located in the factory. The time recorder 2 is used for attendance management of staff working in the factory. The plurality of surveillance cameras 5 are installed at different positions in the factory, continuously shoot the inside of the factory at different angles of view, and store the shot images as moving images. The surveillance camera 5 includes a camera such as a CCD camera, a microphone, a memory, an internal clock that continuously measures the current time, an interface that exchanges information with an external device, and each component of the surveillance camera 5. It includes a control unit that is a computer to control.

The time recorder 2 wirelessly transmits time information indicating the current time measured by the internal clock 25 at that time to the surveillance camera 5 every time a predetermined time (for example, 30 minutes or the like) elapses. The surveillance camera 5 calibrates the time continuously measured by the internal clock of its own device using the time information received from the time recorder 2, and specifies the time after the calibration as the current time. Therefore, the current time specified by each of the plurality of surveillance cameras 5 substantially coincides with the current time specified by the time recorder 2.

The surveillance camera 5 generates moving image information including still image information representing a plurality of still images taken by the camera at a predetermined cycle. The surveillance camera 5 associates each of the plurality of still image information included in the moving image information with time information indicating the current time measured by the internal clock at the time when the still image information is generated. Therefore, the moving image information includes time information indicating each shooting time of the still image represented by the still image information. The surveillance camera 5 generates sounded moving image information by associating the moving image information with the sound information representing the sound picked up by the microphone, and temporarily stores the generated sounded moving image information in the memory.

The surveillance camera 5 sequentially transmits the moving image information with sound temporarily stored in the memory to the time recorder 2. The surveillance camera 5 sequentially deletes the moving image information with sound transmitted to the time recorder 2 from the memory. The time recorder 2 temporarily stores the sounded moving image information received from the surveillance camera 5 in the memory of the control unit 27, and sequentially transmits the stored sounded moving image information to the data server 4. The time recorder 2 sequentially deletes the moving image information with sound transmitted to the data server 4 from the memory.

The factory manager or the like uses a terminal device such as a personal computer to reproduce the moving image and the sound represented by the moving image information with sound stored in the data server 4. At that time, the display device connected to the terminal device sequentially displays the still images constituting the moving image and the shooting time of the still images. According to the system 902, the shooting time displayed on the display device does not substantially deviate from the current time measured by the internal clock 25 of the time recorder 2. Therefore, the factory manager, for example, asks whether the on-duty staff indicated by the attendance information is working in the factory, or whether the non-working staff indicated by the attendance information is working in the factory. Can be confirmed correctly.

(1-4)
In the system 901 described above, the type of device that is the source of the time information used by the drive recorder 1 to calibrate the time measured by the internal clock 103 is the time recorder. The type of device that is the source of the time information acquired by the drive recorder 1 is not limited to the time recorder.

FIG. 8 is a diagram showing the overall configuration of the system 903 according to an example of this modification. The system 903 includes a car navigation system 6 and a plurality of artificial satellites 7 in place of the time recorder 2, the time server 3, and the data server 4 included in the system 901.

The car navigation system 6 of the system 903 and the plurality of drive recorders 1 are mounted on the same vehicle. One of the plurality of drive recorders 1 photographs the front from the inside of the windshield of the vehicle, for example, and the other one photographs the rear from the inside of the rear glass of the vehicle. The recorder 1 is installed at different locations in the same vehicle and photographs different directions from inside the vehicle.

The car navigation system 6 includes a GNSS unit that is a receiving unit of a satellite positioning system, a memory, a touch screen, a speaker, an interface that wirelessly transmits and receives information to and from an external device, an internal clock, and each component of the car navigation system 6. It is provided with a control unit which is a computer for controlling. The car navigation system 6 stores map information representing a map in a memory.

The GNSS unit included in the car navigation system receives information transmitted from each of the plurality of artificial satellites 7, and uses the received information to identify the position (for example, latitude and longitude) of its own device on the earth. The information received by the GNSS unit from the artificial satellite 7 includes time information indicating the current time measured by the atomic clock mounted on the artificial satellite 7. The car navigation system 6 calibrates the time measured by the internal clock of its own device using the time information acquired from the artificial satellite 7 by the GNSS unit, and specifies the time after calibration as the current time.

The car navigation system 6 continuously identifies the position of its own device by the GNSS unit while the vehicle is traveling, and displays a map with the specified position as the central position on the touch screen. Further, the car navigation system 6 specifies the movement route from the current position of the vehicle to the destination specified by the GNSS unit when the destination to which the vehicle is moved is input to the touch screen by the touch operation performed by the user. Then, the line indicating the specified movement route is superimposed on the map and displayed on the touch screen. The driver of the vehicle can easily reach the destination by driving the vehicle according to the movement route indicated by the line displayed on the map by the car navigation system 6.

The car navigation system 6 operates by receiving electric power from the battery of the vehicle. When the driver of the vehicle turns on the power of the vehicle and the power supply from the battery to the car navigation system 6 is started, the car navigation system 6 is activated and the GNSS unit attempts to acquire information from the artificial satellite 7. When the car navigation system 6 succeeds in acquiring the information from the artificial satellite 7, the car navigation system calibrates the time measured by the internal clock of its own device by using the time information included in the information acquired from the artificial satellite 7, and determines the time after the calibration. Specify as the current time.

The car navigation system first succeeds in acquiring information from the artificial satellite 7 after activation, calibrates the time measured by the internal clock of its own device using the time information included in the information acquired from the artificial satellite 7, and after the calibration. When the time of is specified as the current time, the time information indicating the specified current time is wirelessly transmitted to each of the plurality of drive recorders 1. After that, the car navigation system 6 wirelessly transmits time information indicating the current time measured by the internal clock 25 at that time to each of the plurality of drive recorders 1 every time a predetermined time (for example, 30 minutes or the like) elapses.

The drive recorder 1 calibrates the time continuously measured by the internal clock 103 using the time information received from the car navigation system 6, and specifies the time after calibration as the current time. Therefore, the current time specified by each of the plurality of drive recorders 1 substantially coincides with the current time specified by the car navigation system 6. According to the system 903, there is no deviation between the shooting times included in the moving image information generated by the plurality of drive recorders 1 mounted on the same vehicle.

Note that the internal clock 103 may not be calibrated while the drive recorder 1 is capturing an image. In that case, it is advisable to calibrate the internal clock 103 while the drive recorder 1 is not taking an image.

(1-5)
In the system 903 described above, the type of device that transmits the time information used to calibrate the time measured by the internal clock 103 by each of the plurality of drive recorders 1 mounted on the same vehicle is a car navigation system. The type of device that is the source of the time information acquired by the plurality of drive recorders 1 mounted on the same vehicle is not limited to the car navigation system.

FIG. 9 is a diagram showing the overall configuration of the system 904 according to an example of this modification. The system 904 includes a tablet PC 8 and a time server 3 in place of the car navigation system 6 and the artificial satellite 7 provided in the system 903. The tablet PC 8 is a device carried by any of the passengers (including the driver) of the vehicle, and is a slate-type personal computer equipped with a processor, a memory, an internal clock, a touch screen (an example of output means), and a communication interface. is there. The tablet PC 8 may be a smartphone having a mobile phone function. The time server 3 included in the system 904 has the same configuration as the time server 3 included in the system 901.

The communication interface included in the tablet PC 8 includes, for example, a communication unit that connects to a mobile communication network according to a communication standard such as 3G, 4G, LTE, and a communication unit that performs short-range wireless communication according to a communication protocol such as Bluetooth. The tablet PC 8 connects to the Internet via a mobile communication network, and receives time information from the time server 3 via the Internet. The tablet PC 8 calibrates the time measured by the internal clock of its own device using the time information received from the time server 3, and specifies the time after the calibration as the current time.

When the tablet PC 8 establishes a short-range wireless communication connection with the drive recorder 1 while executing a program prepared for the system 904 (hereinafter referred to as a "dedicated application") in the background, the tablet PC 8 is operated. The time information indicating the current time measured by the internal clock of the own device at the time is transmitted to the drive recorder 1. The drive recorder 1 calibrates the time measured by the internal clock 103 using the time information received from the tablet PC 8, and specifies the time after calibration as the current time.

FIG. 10 is a diagram showing an example of a processing sequence performed by the drive recorder 1 and the tablet PC 8. The drive recorder 1 mounted on the vehicle creates a UUID (Universally Unique Identifier) dedicated to time adjustment to promote clock adjustment, and each time a predetermined time (for example, 1 minute, etc.) elapses, the short-range radio is used. A beacon (eg, Bluetooth Beacon) is transmitted according to a communication protocol (eg, Bluetooth).

As an opportunity for the drive recorder 1 to start and end the periodic beacon transmission, for example, a configuration in which the drive recorder 1 starts when the vehicle turns ACC OFF and ends when the vehicle turns ACC ON, ACC OFF. During the period, the beacon is not transmitted, the beacon transmission is started when ACC is turned on, and the beacon transmission is terminated if there is no connection from the tablet PC 8 within a predetermined time (for example, several seconds). , The configuration in which the drive recorder 1 always transmits a beacon at a predetermined time interval at a long time interval while the drive recorder 1 is in operation, and the like.

When a passenger carrying a tablet PC 8 in which the dedicated application is operating in the background gets on the vehicle, the tablet PC 8 detects a beacon transmitted by the drive recorder 1. The tablet PC 8 establishes a communication connection according to Bluetooth with the drive recorder 1 that is the source of the beacon in response to the detection of the beacon.

When the tablet PC 8 establishes a communication connection with the drive recorder 1, it transmits a clock setting request to the drive recorder 1. The clock setting request includes time information indicating the current time (time calibrated using the time information acquired from the time server 3) measured by the tablet PC 8 by the internal clock of its own device. The drive recorder 1 updates the clock data indicating the reference time used by the internal clock 103 for timekeeping by using the time information included in the clock setting request received from the tablet PC 8. As a result, the time measured by the internal clock 103 is calibrated. Subsequently, the drive recorder 1 transmits a clock installation response notifying that the update of the clock data is completed to the tablet PC 8.

When the tablet PC 8 receives the clock setting response from the drive recorder 1, for example, the tablet PC 8 disconnects the communication connection established with the drive recorder 1. However, after receiving the clock setting response from the drive recorder 1, the tablet PC 8 maintains the communication connection established with the drive recorder 1, for example, every time a predetermined time (for example, 30 minutes) elapses. The clock setting request including the time information indicating the current time specified at that time may be transmitted to the drive recorder 1 by using the held communication connection. In this case, the drive recorder 1 uses the time information included in the clock setting request received from the tablet PC 8 every time a predetermined time (for example, 30 minutes) elapses to indicate the reference time used by the internal clock 103 for timekeeping. Update the data.

The process according to the above-described sequence is performed between each of the plurality of drive recorders 1 mounted on the same vehicle and the tablet PC 8.

According to the system 904, when the occupant of the vehicle gets into the vehicle, the time adjustment of the internal clock 103 of the drive recorder 1 is performed without the occupant requiring an operation for adjusting the time on the drive recorder 1.

Further, the current time specified by each of the plurality of drive recorders 1 mounted on the same vehicle substantially coincides with the current time specified by the tablet PC 8. Therefore, according to the system 904, there is no deviation between the shooting times included in the moving image information generated by the plurality of drive recorders 1 mounted on the same vehicle.

In the system 904 described above, the tablet PC 8 acquires the time information from the time server 3. Instead, for example, the tablet PC 8 is equipped with a GNSS unit and uses the time information indicated by the radio wave received from the artificial satellite. , The time measured by the internal clock of the own device may be calibrated, and the time after calibration may be specified as the current time.

(1-6)
In the system 903 described above, the device for calibrating the time measured by the internal clock using the time information acquired from the car navigation system 6 is a plurality of drive recorders mounted on the same vehicle as the car navigation system 6. Instead of this, the device for calibrating the time measured by the internal clock using the time information acquired from the car navigation system 6 may be a device installed at each of a plurality of places where the vehicle passes.

FIG. 11 is a diagram showing the overall configuration of the system 905 according to an example of this modification. The system 905 includes a plurality of artificial satellites 7, a car navigation system 6 mounted on the vehicle, and a time recorder 2A and a time recorder 2B installed in each of the plurality of facilities (facility A and facility B exemplified in FIG. 11).

While the vehicle is traveling outdoors, the car navigation system 6 receives the information transmitted from the artificial satellite 7 by the GNSS unit, calibrates the time measured by the internal clock using the time information included in the received information, and after calibration. Specify the time of as the current time.

After that, when the vehicle moves into the facility A, the car navigation system 6 establishes a communication connection with the time recorder 2A in the facility A according to a short-range wireless communication protocol such as Bluetooth, and clocks with the internal clock of its own device. The time information indicating the current time is transmitted to the time recorder 2A. The time recorder 2A calibrates the time measured by the internal clock 25 using the time information received from the car navigation system 6, and specifies the time after calibration as the current time.

After that, when the vehicle moves into the facility B, the car navigation system 6 establishes a communication connection with the time recorder 2B in the facility B according to a short-range wireless communication protocol such as Bluetooth, and clocks with the internal clock of its own device. The time information indicating the current time is transmitted to the time recorder 2B. The time recorder 2 calibrates the time measured by the internal clock 25 using the time information received from the car navigation system 6, and specifies the time after the calibration as the current time.

When the vehicle passes through the plurality of facilities as described above, the current time specified by the time recorder 2 installed in each of the plurality of facilities substantially coincides with the current time specified by the car navigation system 6. According to the system 905, every time a vehicle equipped with the car navigation system 6 passes through the plurality of facilities, the deviation between the current times specified by the time recorders 2 installed in each of the plurality of facilities is eliminated.

(1-7)
In the system 901 described above, the time recorder 2 receives the time information from the time server 3 via the network. Instead of this, for example, the time recorder 2 may be provided with a radio clock module, and the radio clock module may receive and use radio waves indicating time information transmitted from a transmitting station that clocks with an atomic clock.

[Second Embodiment]
FIG. 12 is a diagram showing the overall configuration of the system 906 according to the embodiment of the present invention. The system 906 includes an HTTP (Hypertext Transfer Protocol) server 9 located in the office of the company and a drive recorder 1 mounted on the vehicle. The HTTP server 9 is a device that transmits various types of information to the requesting device in response to a request from an external device in accordance with HTTP. In this embodiment, the HTTP server 9 is connected to an intranet managed by the company. The HTTP server 9 is a computer provided with a processor, a memory, and a communication interface, and transmits and receives information to and from an external device by wire and wirelessly by the communication interface. The wireless communication performed by the HTTP server 9 using the communication interface is short-range wireless communication that follows a communication protocol such as WiFi or Bluetooth.

The drive recorder 1 included in the system 906 has the same configuration as the drive recorder 1 included in the system 901. However, the drive recorder 1 included in the system 906 has a Web browser function.

In the system 906, the drive recorder 1 wirelessly communicates with the HTTP server 9 by the interface 108. In FIG. 12, it is assumed that the drive recorder 1 and the HTTP server 9 perform one-to-one communication (for example, communication by WiFi Direct or the like), but the HTTP server 9 is a relay device (for example, a wireless LAN bridge). Etc.), communication may be performed with a plurality of devices including the drive recorder 1. In that case, the drive recorder 1 communicates with the HTTP server 9 via the relay device.

When the vehicle moves toward a parking lot near the office of the company, for example, and the drive recorder 1 mounted on the vehicle and the URL server 9 installed in the office succeed in establishing a wireless communication connection, The drive recorder 1 uses the Web browser function to make an access request to the HTTP server 9 using the URL or IP address of the HTTP server 9 registered in advance in the drive recorder 1. In response to the access request, the HTTP server 9 transmits the response information to the drive recorder 1.

FIG. 13 is an example of the response information received by the drive recorder 1 from the HTTP server 9. In the response information shown in FIG. 13, the part after <HTML> is the message body, and the part before <HTML> is the HTTP header. The HTTP header included in the response information includes time information indicating the transmission time of the response information (for example, time information indicating GMT (Greenwich Mean Time)). In FIG. 13, the portion surrounded by the broken line is the time information. The drive recorder 1 calibrates the time measured by the internal clock 103 using the time information included in the response information, and specifies the time after calibration as the current time.

According to the system 906, when the vehicle equipped with the drive recorder 1 moves to the vicinity of the office, the time measured by the internal clock 103 of the drive recorder 1 is calibrated without requiring the user's operation on the drive recorder 1. ..

In some cases, the drive recorder 1 connects to a network (intranet, etc.) in the vicinity of the office according to WiFi or the like, and transmits the video information with sound recorded on the memory card 17 or the like to the data server via the network. Then, the drive recorder 1 may not be able to access the HTTP server 9 while transmitting moving image information with sound or the like. In such a case, the drive recorder 1 may access the HTTP server 9 and calibrate the internal clock 103 before or after the transmission of information to the data server is started or completed, for example. Further, the drive recorder 1 temporarily stops the transmission of information to the data server, accesses the HTTP server 9 to complete the calibration of the internal clock 103, and then accesses the data server again to transmit the untransmitted information. You may go.

(Modified example of the second embodiment)
(2-1)
In the system 906 described above, the drive recorder 1, which is a system for receiving time information, receives and receives information destined for the drive recorder 1, which is its own system, from the HTTP server 9, which is a system for transmitting time information. Acquire the time information included in the information. The type of the system that receives the time information is not limited to the drive recorder, and the type of the system that transmits the time information is not limited to the HTTP server. Further, the system that receives the time information may receive information that is not addressed to its own system that is communicated on the network, and may acquire the time information from the received information.

FIG. 14 is a diagram showing the overall configuration of the system 907 according to an example of this modification. The system 907 includes a groupware server 71 which is a system for transmitting information including time information, a time recorder 2 which is a system for receiving information including time information, a plurality of terminal devices 72, and a relay device 73. The relay device 73 is wirelessly or wiredly connected to each of the groupware server 71, the time recorder 2, and the plurality of terminal devices 72, and relays communication between these systems. The groupware server 71, the time recorder 2, the plurality of terminal devices 72, and the relay device 73 included in the system 907 are installed in, for example, an office of a company to form an intranet.

For example, the groupware server 71 transmits information to the requesting terminal device 72 in accordance with HTTP in response to a request from the terminal device 72. The information transmitted by the groupware server 71 to the terminal device 72 as a destination is received by all the systems on the intranet, but the system that receives the information usually uses the information destined for its own system and uses its own system. Information that is not addressed to is discarded. In the system 907, the time recorder 2 monitors the information transmitted by the groupware server 71 to the terminal device 72 as a destination, and when the information includes the time information, acquires and uses the time information.

Specifically, when the time recorder 2 receives the information transmitted by the groupware server 71 as the destination of the terminal device 72, the time recorder 2 includes the time included in the HTTP header of the information before discarding the information that is not the destination of the own system. Information is acquired, the time measured by the internal clock 25 is calibrated using the acquired time information, and the time after calibration is acquired as the current time.

FIG. 15 is a diagram showing an example of information received by the time recorder 2. In FIG. 15, the portion surrounded by the broken line is the time information indicating the transmission time of this information. The information shown in FIG. 15 is information transmitted from the groupware server 71 to any terminal device 72 and is not addressed to the time recorder 2, but the time recorder 2 uses the time information included in this information. , Used for calibrating the time clocked by the internal clock 25.

According to the system 907, the time measured by the internal clock 25 of the time recorder 2 is calibrated without requiring the user's operation on the time recorder 2.

(2-2)
In the system 906 described above, communication between the HTTP server 9 and the drive recorder 1 is performed according to HTTP. Further, in the system 907 described above, communication between the groupware server 71 and the terminal device 72 is performed according to HTTP. In the system according to the present invention, communication between these systems may be performed according to a communication protocol other than HTTP (for example, RTSP).

(2-3)
In the system 906 described above, the drive recorder 1 acquires the time information included in the header of the information received from the HTTP server 9. Further, in the system 907 described above, the time recorder 2 acquires the time information included in the header of the information received from the groupware server 71. In the system according to the present invention, the system that acquires the time information may acquire the time information from the message body instead of from the header. For example, in the system 907, the time when the groupware server 71 transmits an e-mail addressed to the terminal device 72 and the time recorder 2 clocks the information indicating the transmission time included in the message body of the e-mail by the internal clock 25. May be acquired as time information for calibrating.

(2-4)
In the system 907 described above, the information received by the time recorder 2 is information transmitted / received on the intranet, but the time recorder 2 may receive information transmitted / received via the Internet. For example, the system 907 includes a plurality of HTTP servers connected to the Internet in place of the groupware server 71, for example, each of the plurality of HTTP servers responds to a request from any of the terminal devices 72. The time recorder 2 may receive the information transmitted to the requesting terminal device 72 as the destination, and the time information included in the received information may be used for calibrating the time measured by the internal clock 25.

In this modification, since the device that transmits the information received by the time recorder 2 is an unspecified number of HTTP servers, the current time measured by the internal clocks of those HTTP servers is not always correct. Therefore, when the time recorder 2 receives information from the HTTP server that is not destined for its own system, it determines whether or not the time information included in the information is an abnormal value, and does not use the time information determined to be an abnormal value. .. For example, if the internal clock of the HTTP server that is the source of the information is out of order, the HTTP server sets the default information transmission time (for example, the start time of the UNIX (registered trademark) time in 19701). (Month 1st 0:00:00, etc.) may be used. When the time indicated by the time information included in the received information indicates a default value, the time recorder 2 determines that time as an abnormal value and does not use it.

In addition, the time measured by the internal clock of the HTTP server may deviate significantly from the correct time. In order to determine the time indicated by the time information included in the HTTP header of the information transmitted from such an HTTP server as an abnormal value, the time recorder 2 sets the current time measured by the internal clock 25 and the information received from the HTTP server. The transmission time indicated by the included time information is compared, and if the time difference between them is equal to or greater than a predetermined threshold value, the time indicated by the time information included in the information received from the HTTP server is determined to be an abnormal value and is not used.

The method by which the time recorder 2 determines whether or not the time indicated by the time information included in the information received from the HTTP server is an abnormal value is not limited to the above. For example, when the time recorder 2 receives information from the HTTP server, it indicates a time difference between the time indicated by the time information included in the received information plus a predetermined time and the time measured by the internal clock 25 at that time. Memorize information. This predetermined time is, for example, a preset time as an average time required from the time when the HTTP server acquires the transmission time when transmitting the information to the time when the information transmitted from the HTTP server is received by the time recorder 2. is there. The time recorder 2 stores the above-mentioned time difference information for each of the information received from various HTTP servers, and for example, every time a predetermined time elapses or every time a predetermined number of time difference information is stored, the stored time difference information is stored. Of the time differences indicated by, for example, a time difference indicating a value outside a predetermined confidence interval is determined as an abnormal value.

The time recorder 2 excludes the abnormal values determined as described above, and identifies a probable time difference from the time differences determined not to be abnormal values. As a method for specifying a probable time difference, for example, if there are two or more time differences having the same value, it is conceivable to specify the time difference as a probable time difference. In addition, as a method for identifying a probable time difference, it is conceivable to calculate a statistical value of the time difference determined to be not an outlier. Examples of the statistical value calculated by the time recorder 2 include an average value, a median value, a mode value, and the like. The time recorder 2 calibrates the time measured by the internal clock 25 using the identified and probable time difference.

According to this modification, even if the time indicated by the time information acquired by the time recorder 2 from each of the plurality of HTTP servers varies, the time recorder 2 can calibrate the time measured by the internal clock 25.

[Third Embodiment]
FIG. 16 is a diagram showing the overall configuration of the system 908 according to the embodiment of the present invention. The system 908 includes a drive recorder 1 mounted on the vehicle and a tablet PC 8 carried by the passengers (including the driver) of the vehicle.

The drive recorder 1 included in the system 908 has the same configuration as the drive recorder 1 included in the system 901. However, the drive recorder 1 included in the system 908 has a function of decoding a bar code (for example, a two-dimensional bar code such as a QR code) included in an image taken by the CCD camera 16.

The tablet PC 8 included in the system 908 has the same configuration as the tablet PC 8 included in the system 904. However, the tablet PC8 included in the system 908 is a two-dimensional display that indicates the current time measured by the internal clock of its own device by executing a program prepared for the system 908 (hereinafter referred to as "time code display application"). It has a function to display a bar code on a touch screen. The tablet PC 8 running the time code display application updates and displays, for example, a two-dimensional bar code indicating the current time in seconds on the touch screen every second.

When the vehicle is turned on and the drive recorder 1 is operating by receiving power from the vehicle battery, the vehicle passenger can press the touch screen of the tablet PC 8 running the time code display application on the drive recorder. Hold it in the shooting direction of the CCD camera 16 of 1. When the drive recorder 1 determines, for example, every second whether or not the still image taken by the CCD camera 16 contains a two-dimensional bar code, and determines that the two-dimensional bar code is included. , Decode the two-dimensional bar code and acquire the time information.

The drive recorder 1 calibrates the time measured by the internal clock 103 using the time information acquired as described above, and specifies the time after calibration as the current time. When the drive recorder 1 completes the process of calibrating the time measured by the internal clock 103 using the time information acquired from the two-dimensional bar code, the speaker 104 makes a voice such as "time adjustment is completed." Produce a message. Upon hearing this voice message, the passenger of the vehicle stops holding the tablet PC 8 in the shooting direction of the CCD camera 16.

The drive recorder 1 uses a two-dimensional bar code to display the time so that the process for calibrating the time measured by the internal clock 103 is not unnecessarily repeated while the tablet PC 8 is held in the shooting direction of the CCD camera 16. When the information is acquired, it is not determined for a predetermined time (for example, 5 minutes) whether or not the still image taken by the CCD camera 16 contains the two-dimensional bar code.

In the system 908, the still image used by the drive recorder 1 to acquire the time information is originally a still image taken to record the situation in which the vehicle is traveling. Therefore, according to the system 908, the passenger of the vehicle does not need to perform an operation for switching from the normal mode to the time adjustment mode, for example, and simply converts the tablet PC 8 running the time code display application into the CCD camera 16. The drive recorder 1 can be made to calibrate the time of the internal clock 103 just by holding it over.

In the system 908, the tablet PC 8 displays the time information by a two-dimensional bar code. The two-dimensional bar code is an example of an information display format that can be recognized by the device with higher accuracy than humans can recognize. Therefore, the drive recorder 1 can recognize the time information with higher accuracy than the case where the tablet PC 8 displays the time information by a numerical value or the like.

Further, it is more preferable that the tablet PC 8 displays a two-dimensional bar code indicating time information accompanied by information for error detection and correction. For example, the information indicated by the QR code includes information for error detection and correction. Therefore, the tablet PC 8 may display the time information by the QR code. In this case, when the drive recorder 1 decodes the QR code included in the captured still image, the drive recorder 1 uses the error detection and correction information included in the QR code to check whether the time information indicated by the QR code has an error such as a defect. However, if there is an error such as a defect, the error in the time information is corrected using the information for error detection and correction included in the QR code, and the time indicated by the corrected time information is measured by the internal clock 103. Used for calibration.

(Modified example of the third embodiment)
(3-1)
In the system 908 described above, the time indicated by the time information obtained by decoding the two-dimensional bar code by the drive recorder 1 is a time earlier than the current time at the time of the acquisition. This is because the drive recorder 1 included in the system 908 described above has a time required for the tablet PC 8 to generate a two-dimensional bar code indicating the time after the tablet PC 8 measures the time by the internal clock and to start the display by the touch screen. After the dimensional bar code is displayed on the touch screen of the tablet PC 8, the time until the drive recorder 1 shoots the two-dimensional bar code with the CCD camera 16 and completes the decoding of the two-dimensional bar code included in the shot image. This is because it does not consider. In addition, the tablet PC 8 determines the timing at which the time in seconds measured by the internal clock changes, and the drive recorder 1 determines whether or not the still image captured by the CCD camera 16 contains a two-dimensional bar code. The timings do not always match. Therefore, there is a gap of up to 1 second between those timings. Therefore, if the time indicated by the time information obtained by decoding the two-dimensional bar code by the drive recorder 1 is regarded as the current time at that time and the time measured by the internal clock 103 is calibrated, the time after the calibration is correct. The time is slightly different from the current time.

In order to alleviate the above inconvenience, the drive recorder 1 may perform the following processing. In the following description, as an example, the CCD camera 16 takes a picture every 1/30 second.

First, the drive recorder 1 determines whether or not a two-dimensional bar code is included in the still image taken by the CCD camera 16 every 1/30 second. When the drive recorder 1 determines that the still image contains a two-dimensional bar code, the drive recorder 1 decodes the two-dimensional bar code to acquire time information, and temporarily stores the acquired time information. In this modification, even after the drive recorder 1 acquires the time information from the two-dimensional bar code once, it is determined whether or not the drive recorder 1 includes the two-dimensional bar code for each of the subsequent still images, and is included in the still image. The decoding of the two-dimensional bar code and the storage of the time information acquired by the decoding are repeated.

When the drive recorder 1 newly acquires the time information, it compares the last acquired and stored time information with the newly acquired time information, and if they are different, the time indicated by the newly acquired time information. The time obtained by adding a predetermined time to is specified as the current time, and the time measured by the internal clock 103 is calibrated using the specified current time. Here, the predetermined time is the time required for the tablet PC 8 to generate a two-dimensional bar code indicating the time and start displaying it on the touch screen after the tablet PC 8 measures the time with the internal clock (hereinafter, "two-dimensional bar code". After the two-dimensional bar code is displayed on the touch screen of the tablet PC 8, the drive recorder 1 shoots the two-dimensional bar code with the CCD camera 16 and the two-dimensional included in the shot image. It is the total time to complete the decoding of the bar code (hereinafter referred to as "the time required to read the two-dimensional bar code"), and is specified by measuring in advance using a tablet PC with a general processing speed. It's time to be.

When considering different processing speeds for each tablet PC, for example, the tablet PC 8 does not display a two-dimensional bar code indicating the time itself measured by the internal clock, but the time measured by the internal clock is described above. The two-dimensional bar code indicating the time required for displaying the two-dimensional bar code (the time when the processing speed of the tablet PC 8 is reflected) may be added. In this case, the drive recorder 1 sets the time indicated by the time information after the change at the timing when the time information acquired from the two-dimensional bar code is changed, plus the time required for reading the above-mentioned two-dimensional bar code. Specify as the current time. The drive recorder 1 calibrates the time measured by the internal clock 103 using the current time specified in this way. In this case, the drive recorder 1 can calibrate the time measured by the internal clock 103 with an accuracy of more than 1 second.

(3-2)
In the system 908 described above, the drive recorder 1 recognizes the two-dimensional bar code from the still image taken by the CCD camera 16. Instead of this, the drive recorder 1 may recognize the clock from the still image taken by the CCD camera 16 and specify the time indicated by the recognized clock.

FIG. 17 is a diagram showing the overall configuration of the system 909 according to an example of this modification. The system 909 includes a drive recorder 1 mounted on the vehicle. Compared with the drive recorder 1 provided in the system 908, the drive recorder 1 included in the system 909 recognizes a clock (either an analog clock or a digital clock) instead of a two-dimensional bar code from a still image taken by the CCD camera 16. The point to do is different.

When the passenger of the vehicle holds the clock 74 worn on his / her arm, for example, in the shooting direction of the CCD camera 16 of the operating drive recorder 1, the drive recorder 1 starts the clock from the still image taken by the CCD camera 16. If the recognized clock 74 is an analog clock, the time indicated by the clock 74 is based on the position of the hands in the clock 74, and if the recognized clock 74 is a digital clock, the time indicated by the clock 74 is based on the numerical value in the clock 74. To identify. The drive recorder 1 calibrates the time measured by the internal clock 103 using the time information indicating the time specified in this way.

When the drive recorder 1 recognizes an analog clock without a dial, in order to specify the direction of the analog clock, for example, from a still image, the arm on which the analog clock is attached and the hand connected to the arm are connected. You may recognize your thumb. In this case, the drive recorder 1 specifies the direction orthogonal to the direction in which the arm is extended and the direction toward the little finger side as the 12 o'clock direction of the analog clock. Further, the drive recorder 1 may recognize the band of the analog timepiece instead of the arm, and specify the direction in which the band extends and toward the little finger side as the 12 o'clock direction of the analog timepiece.

According to the system 909, the passenger of the vehicle can make the drive recorder 1 calibrate the time measured by the internal clock 103 by holding the clock over the CCD camera 16 of the drive recorder 1.

In the system 909, the drive recorder 1 may constantly monitor whether or not the image captured by the CCD camera 16 includes a clock during operation, but for example, immediately after the power is turned on and started up. After the user performs an operation for adjusting the time on the drive recorder 1, a notification such as "Please hold the wristwatch" is given, and the clock is added to the image taken by the CCD camera 16 only during the subsequent predetermined time period. May be monitored for or not included. Further, it may be monitored whether or not the image captured by the CCD camera 16 includes a clock only during a period of a predetermined time length from the time when the predetermined time elapses after the previous time adjustment is performed.

Further, in the system 909, when the drive recorder 1 calibrates the time measured by the internal clock 103, the drive recorder 1 may notify the user to confirm pressing a predetermined button or the like.

In the system 909 described above, the drive recorder 1 specifies the time from the image of the passenger's wristwatch taken by the CCD camera 16, but the clock taken by the CCD camera 16 is not limited to the passenger's wristwatch. For example, when the instrument panel of the vehicle is included in the shooting range of the CCD camera 16, the drive recorder 1 may specify the time indicated by the clock included in the instrument panel from the image taken by the CCD camera 16.

In addition, the time accuracy of the clock 74 worn by the passenger of the vehicle may not be high. Therefore, instead of the drive recorder 1 calibrating the time measured by the internal clock 103 based on the time indicated by the image of the clock 74 taken by the CCD camera 16, for example, the time measured by the internal clock 103 and the clock 74. When there is a deviation of more than a predetermined threshold from the time specified in the image, the drive recorder 1 needs to adjust the time, for example, "The time setting is significantly deviated. Please set the time." Notifications may be given to make the user aware of the sex.

(3-3)
In the system 908 and system 909 described above, the type of device that acquires time information from a still image taken by a camera is a drive recorder, but the type of device is not limited to the drive recorder. FIG. 18 is a diagram showing the overall configuration of the system 910 according to an example of this modification. The system 910 includes a time recorder 2 and a surveillance camera 75. The time recorder 2 and the surveillance camera 75 are arranged indoors, for example, in a factory. The configuration of the time recorder 2 included in the system 910 is the same as the configuration of the time recorder 2 included in the system 901. The surveillance camera 75 is different from the surveillance camera 5 included in the system 902 in that it includes a hemispherical camera, but has the same configuration as the surveillance camera 5 in other respects.

The surveillance camera 75 is installed on the ceiling of a factory, for example, and simultaneously captures a range covering all directions of the space below the ceiling. The time recorder 2 is arranged so that the display unit 21 can be seen from the position of the surveillance camera 75. Therefore, a numerical value indicating the time displayed by the time recorder 2 is reflected in the still image captured by the surveillance camera 75.

The surveillance camera 75 recognizes the time displayed by the time recorder 2 from the captured still image, for example, every time a predetermined time (for example, 30 minutes, etc.) elapses, and the internal clock of the own device uses the recognized time. Calibrate the time to be clocked.

According to the system 910, the current time measured by the surveillance camera 75 by the internal clock and the current time measured by the time recorder 2 by the internal clock 25 substantially match. Therefore, the time difference between the shooting time indicated by the time information included in the moving image information generated and stored by the surveillance camera 75 and the time used by the time recorder 2 to generate the attendance information is measured by the internal clocks of those devices. There is no inconsistency due to.

If the shooting range of the surveillance camera 75 and the position of the time recorder 2 do not change, the position of the area where the time recorder 2 displays the time in the image captured by the surveillance camera 75 does not change. Therefore, for example, the user may specify the area of the clock in the image captured by the surveillance camera 75 by enclosing it in a circle, and the surveillance camera 75 may recognize the clock from the area specified by the user. In this case, for example, the user may connect a terminal device such as a laptop computer to the surveillance camera 75 and perform an operation of designating a clock area with a mouse or the like for an image captured by the surveillance camera 75 displayed on the terminal device. ..

Further, when the time display of the time recorder 2 is an analog clock type display, the user may specify a reference direction such as a 12 o'clock direction in the image displayed on the terminal device.

(3-4)
In the system 909 described above, the drive recorder 1 identifies the clock held by the passenger of the vehicle from the still image taken by the CCD camera 16. Instead of this, the drive recorder 1 identifies a clock arranged outside the vehicle from the still image taken by the CCD camera 16, and the internal clock 103 measures the time indicated by the identified clock to calibrate the time. You may use it.

FIG. 19 is a diagram showing the overall configuration of the system 911 according to an example of this modification. The system 911 includes a drive recorder 1 and a car navigation system 6 mounted on the vehicle. The car navigation system 6 provided in the system 911 is based on the vehicle position information indicating the position of the vehicle (for example, latitude and longitude) measured by the own device and the change over time of the position indicated by the vehicle position information by radio according to a communication protocol such as Bluetooth. The traveling direction information indicating the traveling direction of the specified vehicle is continuously transmitted to the drive recorder 1.

The drive recorder 1 stores a clock position table that stores clock position information indicating the position (for example, latitude and longitude) of each of various clocks arranged at a position visible from an outdoor road. .. The drive recorder 1 is stored in the clock position table, for example, based on the vehicle position information and the traveling direction information continuously received from the car navigation system 6 every predetermined time (for example, 10 seconds, etc.). From the clock positions indicated by the clock position information, the positions within the angle of view of the CCD camera 16 are extracted. Hereinafter, a period in which one or more clock positions within the angle of view of the CCD camera 16 are extracted from the clock positions indicated by the clock position information stored in the clock position table is referred to as a “clock shooting period”. The drive recorder 1 stores the start time and the end time of the clock shooting period.

When the drive recorder 1 stores the end time of a certain clock shooting period, it attempts to recognize the clock from each of the still images taken by the CCD camera 16 during the clock shooting period, identifies the recognized clock, and performs the same clock. The one with the clearest image is selected from those judged to be, and the time indicated by the clock represented by the selected image is specified.

If the clock represented by the image is a digital clock, the drive recorder 1 specifies the time by OCR. If the clock represented by the image is an analog clock, the drive recorder 1 specifies, for example, the direction of the vertical line of the building represented by the image as the vertical direction, and the specified vertical direction as the direction of 12 o'clock to 6 o'clock, and the hour hand. Specify the time based on the position of the minute hand. The drive recorder 1 stores time difference information indicating a time difference between the time specified in this way and the shooting time of the image (time measured by the internal clock 103).

While the vehicle is running, the drive recorder 1 stores the above-mentioned time difference information with respect to each of the plurality of clocks arranged in the vicinity of the movement path of the vehicle. When the time difference information stored in this way reaches a predetermined number, for example, the drive recorder 1 selects and selects, for example, a time difference within the confidence interval of 95% among the time differences indicated by the stored time difference information. Calculate the statistical value of the time difference (for example, the average value).

The drive recorder 1 calibrates the time measured by the internal clock 103 using the statistical value of the time difference calculated as described above.

According to the system 911, the passenger of the vehicle can make the drive recorder 1 calibrate the time measured by the internal clock 103 by driving the vehicle without operating the drive recorder 1.

In the system 911 described above, the drive recorder 1 recognizes the clock from the image when it approaches the position indicated by the clock position information, and specifies the time. Instead of this, the drive recorder 1 may always recognize the clock from the image and specify the time during a period in which the traveling speed of the vehicle is slower than a predetermined threshold value, for example.

(3-5)
In the system 908 described above, the tablet PC 8 displays a two-dimensional bar code, and the drive recorder 1 reads and decodes the two-dimensional bar code displayed by the tablet PC 8 to acquire time information. Instead, the tablet PC 8 displays a color that changes according to the visible light communication standard by the touch screen, the drive recorder 1 photographs the touch screen of the tablet PC 8 by the CCD camera 16, and the color change indicated by the captured image is shown. Time information may be acquired.

FIG. 20 is a diagram showing the overall configuration of the system 912 according to an example of this modification. The system 912 includes a drive recorder 1 mounted on the vehicle and a tablet PC 8 carried by the passengers (including the driver) of the vehicle. In the system 912, the tablet PC 8 executes a program prepared for the system 912 (hereinafter referred to as a “time color display application”) to indicate the current time measured by the internal clock of the own device, which is visible over time. It has a function to display light (color) on the touch screen. The tablet PC 8 running the time color display application displays, for example, a changing color as a background color, which indicates the current time in minutes according to the visible light communication standard, on the touch screen.

FIG. 21 is a diagram for explaining a mechanism for transmitting time information by changing the color displayed on the touch screen as the background color of the tablet PC 8 in the system 912. For example, in the visible light communication standard used in System 912, purple (eg, electromagnetic waves in the wavelength range of 380-450 nm) indicates a series of color delimiters (stop bits) that indicate one piece of information, and red (eg, electromagnetic waves in the wavelength range of 380-450 nm). For example, an electromagnetic wave with a wavelength in the range of 620-750 nm indicates a binary "0", and green (for example, an electromagnetic wave with a wavelength in the range of 495-570 nm) indicates a binary "1". The tablet PC 8 displays, for example, an image of a background color that changes in the order of purple → red → green → red → red → green → ... On the touch screen at a cycle of 1/30 second.

Each time the drive recorder 1 takes a picture with the CCD camera 16, the drive recorder 1 tries to recognize the image of the tablet PC 8 from the taken still image. When the drive recorder 1 succeeds in recognizing the image of the tablet PC 8 from the still image taken by the CCD camera 16, the drive recorder 1 subsequently identifies the background color included in the recognized image of the tablet PC 8. For example, if the ratio of the area of the uniform color area to the area of the entire touch screen of the recognized image of the tablet PC 8 is equal to or more than a predetermined value (for example, 70%), the drive recorder 1 uses that color as the background. Specify as a color.

The drive recorder 1 stores color information indicating the background color specified as described above. When the drive recorder 1 first recognizes purple as the background color and then recognizes purple again, the drive recorder 1 identifies the time information indicated by the bit string indicated by the color information stored during that period. The drive recorder 1 calibrates the time measured by the internal clock 103 using the time information specified in this way, and specifies the time after the calibration as the current time. When the drive recorder 1 completes the process of calibrating the time measured by the internal clock 103, the speaker 104 emits a voice message such as "time adjustment is completed." Upon hearing this voice message, the passenger of the vehicle stops holding the tablet PC 8 in the shooting direction of the CCD camera 16.

According to the system 912, the passenger of the vehicle holds the tablet PC 8 running the time color display application over the CCD camera 16 of the drive recorder 1 without operating the drive recorder 1, and is inside the drive recorder 1. The time measured by the clock 103 can be calibrated.

(3-6)
In the system 912 described above, the drive recorder 1 captures visible light displayed on the touch screen of the tablet PC 8 and acquires time information indicated by the color of the captured visible light. Instead of the light displayed on the touch screen of the tablet PC 8, the drive recorder 1 may photograph the infrared light emitted from the infrared remote controller and acquire the time information indicated by the photographed infrared light.

FIG. 22 is a diagram showing the overall configuration of the system 913 according to an example of this modification. The system 913 includes a drive recorder 1 mounted on the vehicle and an infrared remote controller 76 operated by the passengers (including the driver) of the vehicle. The infrared remote controller 76 has a plurality of buttons that accept user operations, and when the user presses any of these buttons, an infrared signal indicating a numerical value or the like corresponding to the pressed button is emitted from the light emitting unit. Examples of the method of indicating a numerical value or the like by infrared rays include a method of indicating a bit value by a combination of a transmission time and a non-transmission time of infrared rays.

Each time the drive recorder 1 takes a picture with the CCD camera 16, it determines whether or not infrared rays are reflected in the shot still image, and if so, stores the shooting time of the still image. The passenger of the vehicle points the light emitting part of the infrared remote controller 76 toward the CCD camera 16 of the drive recorder 1 and sets it to a numerical value indicating the current time (for example, "131530" if "13:15:30"). When the corresponding buttons are pressed in sequence and then the "OK" button is pressed, the drive recorder 1 stores all the shooting times within the period in which infrared rays are emitted from the infrared remote controller 76 (infrared ray transmission period). The drive recorder 1 outputs a bit string indicated by a signal emitted from the infrared remote controller 76 based on the length of the infrared transmission period indicated by the stored shooting time and the period between those transmission periods (infrared non-transmission period). Identify and identify the time indicated by the identified bit string.

When the drive recorder 1 specifies the time as described above, the drive recorder 1 calibrates the time elapsed with time by the internal clock 103 using the specified time. When the drive recorder 1 completes the process of calibrating the time measured by the internal clock 103, the speaker 104 emits a voice message such as "time adjustment is completed."

According to the system 913, the passenger of the vehicle sets the time measured by the internal clock 103 on the drive recorder 1 by inputting the time to the infrared remote controller 76 with the infrared remote controller 76 pointed at the drive recorder 1. Can be calibrated.

(3-7)
In the system 908 described above, the tablet PC 8 displays an image indicating the current time, and the drive recorder 1 captures the image and specifies the current time indicated by the captured image. Instead, the tablet PC 8 may emit a sound indicating the current time, the drive recorder 1 may pick up the sound, and the current time indicated by the picked-up sound may be specified.

FIG. 23 is a diagram showing the overall configuration of the system 914 according to an example of this modification. The system 914 includes a drive recorder 1 mounted on the vehicle and a tablet PC 8 carried by the passengers (including the driver) of the vehicle. In the system 914, the tablet PC 8 is provided with a speaker, and by executing a program prepared for the system 914 (hereinafter, referred to as a "time sound transmission application"), a sound indicating the current time measured by the internal clock of the own device is used. Has a function to sound from the speaker. Examples of the method of indicating the current time by sound include DTMF (Dual-Tone Multi-Frequency), amplitude modulation method, frequency modulation method, phase modulation method, and a combination thereof.

The drive recorder 1 continuously determines whether or not the sound picked up by the microphone 106 includes a sound indicating the current time (for example, a modulated sound), and if so, that sound. Identify the current time indicated by. When the passenger of the vehicle causes the tablet PC 8 to execute the time sound transmission application in the vehicle, the tablet PC 8 emits a sound indicating the current time, and the drive recorder 1 specifies the current time indicated by the sound.

When the drive recorder 1 specifies the current time as described above, the drive recorder 1 calibrates the time elapsed with time by the internal clock 103 using the specified current time. When the drive recorder 1 completes the process of calibrating the time measured by the internal clock 103, the speaker 104 emits a voice message such as "time adjustment is completed."

According to the system 914, the passenger of the vehicle can make the drive recorder 1 calibrate the time measured by the internal clock 103 by causing the tablet PC 8 to execute the time sound transmission application in the vehicle.

(3-8)
In the system 914 described above, the drive recorder 1 acquires time information from the sound emitted by the tablet PC 8. Instead of this, the drive recorder 1 may acquire the time information from the voice emitted by the passengers (including the driver) of the vehicle.

FIG. 24 is a diagram showing the overall configuration of the system 915 according to an example of this modification. The system 915 includes a drive recorder 1 mounted on the vehicle.

The drive recorder 1 continuously performs a process of recognizing a sound from the sound picked up by the microphone 106. Then, when the drive recorder 1 recognizes a predetermined word (for example, "what is the current time?") From the sound picked up by the microphone 106, the drive recorder 1 notifies the current time measured by the internal clock 103 (for example, "what is the current time?"). "It's XX hours XX minutes." Etc.) is emitted from the speaker 104. The passenger of the vehicle compares the current time notified by this voice message with, for example, the current time indicated by his / her own watch, and if they do not substantially match, the current time indicated by his / her own watch. Speak a voice notifying the time (for example, "The current time is XX hours XX minutes.").

The drive recorder 1 recognizes the voice uttered by the passenger of the vehicle and acquires the time information included in the recognized voice. The drive recorder 1 calibrates the time elapsed by the internal clock 103 using the time information acquired from the voice. When the drive recorder 1 completes the process of calibrating the time measured by the internal clock 103, the speaker 104 sends a voice message such as "The time has been adjusted. The current time is XX hours XX minutes." Emit from. The passenger of the vehicle confirms that the time measured by the drive recorder 1 is correctly calibrated by this voice message.

According to the system 915, the passenger of the vehicle can have the drive recorder 1 calibrate the time measured by the internal clock 103 by interacting with the drive recorder 1.

[Fourth Embodiment]
FIG. 25 is a diagram showing the overall configuration of the system 916 according to the embodiment of the present invention. The internal clock 103 of the drive recorder 1 counts the number of signals emitted by the oscillator 1031 (for example, a crystal oscillator such as a temperature-compensated crystal oscillator (TCXO)) that periodically emits a signal and the oscillator 1031 after the reference time. The clock unit 1032 for measuring the current time is provided. The period at which the oscillator 1031 emits a signal is determined by the oscillation frequency of the oscillator of the oscillator 1031, but the oscillation frequency may deviate from the design value due to an error during processing of the oscillator. When the oscillation frequency of the oscillator deviates from the design value, the time measured by the internal clock 103 deviates from the correct time with the passage of time. The system 916 solves the above-mentioned inconvenience by using a pulse signal called a 1PPS (Pulse Per Second) signal output by the GNSS unit.

The system 916 includes a GNSS unit 77, a correction multiplier calculation device 78, and a drive recorder 1. The GNSS unit 77, the correction multiplier calculation device 78, and the drive recorder 1 shown in FIG. 25 are arranged in a factory where the drive recorder 1 is manufactured. The drive recorder 1 included in the system 916 includes a non-volatile memory 110 in addition to the same configuration as the drive recorder 1 included in the system 901.

The GNSS unit 77 is a device that receives information transmitted from the artificial satellite 7 and measures the position (for example, latitude and longitude) of its own device. The information received by the GNSS unit 77 from the artificial satellite 7 includes the time information used by the GNSS unit 77 to measure the position of its own device. This time information is time information generated by the atomic clock mounted on the artificial satellite 7, and is more accurate than the time information indicating the time measured by the internal clock 103. The GNSS unit 77 has a 1PPS signal output unit 771 that outputs a 1PPS signal every second based on the time information received from the artificial satellite 7.

The correction multiplier calculation device 78 includes an operator 781, a correction multiplier calculation unit 782, and a correction multiplier output unit 783. The operator 781 is an operation button or the like that accepts an operator's operation on the correction multiplier calculation device 78. The correction multiplier calculation unit 782 receives a 1PPS signal from the 1PPS signal output unit 771 of the GNSS unit 77 every second, triggered by the fact that a predetermined operation is performed on the operator 781, and the internal clock of the drive recorder 1. A signal is received from the oscillator 1031 of the 103 at a fixed cycle (an example of a predetermined cycle), and the number of signals received from the oscillator 1031 is counted at a predetermined time T (for example, 1 minute or the like) specified by the reception timing of the 1PPS signal. To do. Hereinafter, the number of signals counted by the correction multiplier calculation device 78 is referred to as a measurement signal number Cm.

The correction multiplier calculation unit 782 is the number of signals to be output at a predetermined time T (for example, 1 minute or the like) when the oscillator 1031 outputs a signal in the designed period (an example of a reference period) (hereinafter, this number). Is divided by the number of measurement signals Cm) is calculated as the correction multiplier M (an example of information indicating the difference between the predetermined period and the reference period). That is, M = Cd / Cm.

The correction multiplier output unit 783 outputs the correction multiplier M calculated by the correction multiplier calculation unit 782 to the drive recorder 1. The drive recorder 1 stores the correction multiplier M received from the correction multiplier output unit 783 of the correction multiplier calculation device 78 in the non-volatile memory 110.

As described above, the correction multiplier M stored in the non-volatile memory 110 sets the current time based on the signal received from the oscillator 1031 by the timekeeping unit 1032 when the drive recorder 1 is shipped and mounted on the vehicle for use. It is used when timing. FIG. 26 is a diagram showing a state in which the drive recorder 1 included in the system 916 is mounted on a vehicle and used.

The timekeeping unit 1032 continuously counts the number of signals received from the oscillator 1031 after the reference time. Hereinafter, the number of signals currently counted by the time measuring unit 1032 is defined as the number of measured signals Dm. The timekeeping unit 1032 calculates the elapsed time P (seconds) from the reference time to the current time according to the following formula. However, F is a design value of the oscillation frequency (Hz) of the oscillator of the oscillator 1031.
P = (Dm × M) / F

For example, when the design value F of the oscillation frequency of the oscillator of the oscillator 1031 is 32.768 kHz and the predetermined time T is 1 minute, the design signal number Cd is 1,966,080. For example, if the number of measurement signals Cm is 1,966,078, the oscillation frequency of this oscillator is lower than the design value (the signal output cycle is long). In this case, the correction multiplier M = 1,966,080 / 1,966,078.

If the actual oscillation frequency of the oscillator of the oscillator 1031 matches the design value F, the elapsed time P from the reference time is Dm / F. However, in the case of the above example, the elapsed time calculated by Dm / F is shorter than the actual elapsed time P. Therefore, in this case, the current time measured by the internal clock 103 is delayed with the passage of time from the actual current time. When the value obtained by multiplying the number of measurement signals Dm by the correction multiplier M (in this case, M> 1) is used instead of the number of measurement signals Dm, between the current time measured by the internal clock 103 and the actual current time. There is no difference.

According to the system 916, even if the period in which the oscillator 1031 of the internal clock 103 outputs a signal does not match the value designed due to an error during processing of the oscillator, due to this point, The current time measured by the internal clock 103 does not deviate from the actual current time.

(Modified example of the fourth embodiment)
(4-1)
The period in which the oscillator of the internal clock emits a signal may change depending on the environmental parameters (physical quantities) of the outside world. For example, when the oscillator included in the internal clock is a crystal oscillator that uses a crystal as an oscillator, the period at which the oscillator emits a signal is affected by temperature. In the system 916 described above, the influence of these environmental parameters on the current time measured by the internal clock 103 is not considered, but the influence of those environmental parameters may be taken into consideration.

FIG. 27 is a diagram showing the configuration of the system 917 according to an example of this modification. The drive recorder 1 included in the system 917 includes a thermometer 1000 (an example of measuring means) in addition to the configuration provided in the drive recorder 1 included in the system 916.

The correction multiplier calculation unit 782 of the correction multiplier calculation device 78 included in the system 917 calculates the correction multiplier M by triggering that a predetermined operation is performed on the operator 781, and the thermometer 1000 is transmitted from the drive recorder 1. The temperature information indicating the measured temperature is received, and the received temperature information is handed over to the correction multiplier output unit 783 together with the calculated correction multiplier M. The correction multiplier output unit 783 outputs the correction multiplier M and the temperature information received from the correction multiplier calculation unit 782 to the drive recorder 1. The drive recorder 1 stores the temperature information in association with the correction multiplier M received from the correction multiplier calculation device 78 in the non-volatile memory 110.

For example, in a factory, a worker places the drive recorder 1 in a container equipped with a heater and a cooler, and the temperature around the drive recorder 1 can be changed in an environment in which the drive recorder 1 is placed at the time of use. Within, for example, by changing the temperature by 1 degree, a predetermined operation is performed on the actuator 781, and the correction multiplier calculation device 78 is made to calculate the correction multiplier M at that temperature. The correction multiplier M calculated by the correction multiplier calculation device 78 is stored in the non-volatile memory 110 in association with the temperature information indicating the temperature of the environment in which the drive recorder 1 was placed at the time of calculation.

When the drive recorder 1 is used, the time measuring unit 1032 of the internal clock 103 receives and receives temperature information indicating the temperature at that time from the thermometer 1000, for example, every time a predetermined time (for example, 10 seconds) elapses. The correction multiplier M stored in association with the temperature information is read from the non-volatile memory 110, and the read correction multiplier M is used for timing the current time. FIG. 28 shows how the timekeeping unit 1032 receives temperature information from the thermometer 1000, reads the correction multiplier M from the non-volatile memory 110, and receives a signal from the oscillator 1031 when the drive recorder 1 included in the system 917 is used. It is a figure.

In the above description, an example in which temperature is used as an external environmental parameter (physical quantity) that affects the period in which the oscillator 1031 emits a signal has been described, but in addition to or in place of temperature, other types of Physical quantities may be used.

According to the system 917, even if the period in which the oscillator 1031 included in the internal clock 103 emits a signal changes due to an external environmental parameter (physical quantity), the internal clock 103 keeps time due to the change in the environmental parameter. The deviation of the current time from the actual current time is reduced.

(4-2)
In the system 916 and the system 917 described above, the calculation of the correction multiplier M is performed at the factory before the drive recorder 1 is shipped. Instead of this, the calculation of the correction multiplier M may be performed while the drive recorder 1 mounted on the vehicle is in use.

FIG. 29 is a diagram showing the configuration of the system 918 according to an example of this modification. The system 918 includes a car navigation system 6 and a drive recorder 1 mounted on the vehicle. The car navigation system 6 included in the system 918 includes a GNSS unit 77 having a 1PPS signal output unit 771. Further, the drive recorder 1 provided in the system 918 includes a correction multiplier calculation unit 782 that is provided in the correction multiplier calculation device 78 in the system 917.

In the system 918, the drive recorder 1 calculates the correction multiplier M by the correction multiplier calculation unit 782 immediately after the start of the operation, and stores the calculated correction multiplier M in the non-volatile memory 110. After that, the drive recorder 1 newly calculates the correction multiplier M by the correction multiplier calculation unit 782 during operation, for example, every time a predetermined time (for example, 10 minutes, etc.) elapses, and the calculated new correction multiplier M is used as the non-volatile memory 110. Overwrites the correction multiplier M stored in. Each time the correction multiplier M stored in the non-volatile memory 110 is updated, the internal clock 103 reads the updated correction multiplier M from the non-volatile memory 110 and uses it for timing the current time.

According to the system 918, even if the period in which the oscillator 1031 included in the internal clock 103 emits a signal deviates from the design value, the deviation of the current time measured by the internal clock 103 from the actual current time due to the deviation is reduced. Will be done.

(4-3)
In the system 916 and system 917 described above, a 1PPS signal is used for the correction of the internal clock 103. Instead of the 1PPS signal, other types of signals output at predetermined time intervals may be used. For example, when the car navigation system 6 and the drive recorder 1 are equipped with a module called USART (Enhanced Universal Synchronous Asynchronous Receiver Transmitter) or UART (Universal Asynchronous Receiver Transmitter) and send / receive data by wired connection, a signal called Start Bit is specified. It is sent and received at the time interval of. The drive recorder 1 may calculate the correction multiplier M by counting the Start Bit transmitted from the car navigation system 6.

[Fifth Embodiment]
FIG. 30 is a diagram showing the overall configuration of the system 919 according to the embodiment of the present invention. The system 919 includes a car navigation system 6 mounted on a vehicle, one drive recorder 1A, and one or more drive recorders 1B. The car navigation system 6 has the same configuration as the car navigation system 6 provided in the system 903. The drive recorder 1A and the drive recorder 1B have the same configuration as the drive recorder 1 included in the system 901. The drive recorder 1A communicates with the car navigation system 6 according to a communication protocol such as Bluetooth, and the drive recorder 1B communicates with the drive recorder 1A according to a communication protocol such as Bluetooth.

Similar to the drive recorder 1 in the system 903, the drive recorder 1A receives time information from the car navigation system 6 and calibrates the time measured by the internal clock 103 of its own device using the received time information. Further, the drive recorder 1A transmits the time information indicating the time measured by the internal clock 103 of the own device (the time after calibration using the time information received from the car navigation system 6) to the drive recorder 1B. The drive recorder 1B uses the time information received from the drive recorder 1A to calibrate the time measured by the internal clock 103 of its own device.

According to the system 919, the drive recorder 1A and the drive recorder 1B time the correct time without requiring an operation for time adjustment by the passenger of the vehicle.

(Modified example of the fifth embodiment)
In the system 919 described above, time information is transmitted and received between a plurality of drive recorders mounted on the same vehicle. Instead of this, time information may be transmitted and received between a plurality of drive recorders mounted on different vehicles.

FIG. 31 is a diagram showing the configuration of the system 900 according to an example of this modification. The system 900 includes, for example, a drive recorder 1 (not shown) mounted on each of a plurality of vehicles traveling on a road, and a tablet PC 8 carried by a occupant of any of the vehicles. The tablet PC 8 included in the system 900 has the same configuration as the tablet PC 8 included in the system 904. Further, the drive recorder 1 included in the system 900 has the same configuration as the drive recorder 1 included in the system 901. Hereinafter, the drive recorders 1 mounted on each of the vehicles a to n shown in FIG. 31 will be referred to as drive recorders 1a to 1n. Each of the drive recorders 1a to 1n constructs a mesh network according to, for example, a Bluetooth Mesh standard that extends BLE (Bluetooth Low Energy).

For example, when the vehicle i is turned on after the passenger of the vehicle i carries the tablet PC 8 and gets into the vehicle i, the drive recorder 1i receives the time information from the tablet PC 8 and uses the received time information. The time measured by the internal clock 103 of the own device is calibrated. After that, the drive recorder 1i establishes a communication connection with the drive recorder 1 mounted on any of the vehicles traveling in the vicinity of the vehicle i until a predetermined time (for example, 10 minutes or the like) elapses. Try.

When the drive recorder 1i succeeds in establishing a communication connection with any of the drive recorders 1, the time information received from the tablet PC 8 (hereinafter referred to as time information X) and the current time measured by the internal clock 103 of the own device are used. Time information indicating the time (hereinafter referred to as time information Y) is transmitted to the drive recorder 1 of the other party of the communication connection. The arrow in FIG. 31 indicates that the drive recorder 1i succeeded in establishing a communication connection between each of the drive recorder 1f and the drive recorder 1j, and transmitted the time information X and the time information Y to those drive recorders 1. ing.

The drive recorder 1i does not need to establish a communication connection between the drive recorder 1f and the drive recorder 1j at the same time. The drive recorder 1i establishes a communication connection with the drive recorder 1f, for example, transmits the time information X and the time information Y indicating the current time clocked by the internal clock 103 at that time to the drive recorder 1f, and then drives the drive. The communication connection with the recorder 1f is canceled, then the communication connection with the drive recorder 1j is established, and the time information X and the time information Y indicating the current time measured by the internal clock 103 at that time are stored in the drive recorder. After transmitting to 1j, the communication connection with the drive recorder 1j is canceled.

Further, each of the drive recorders 1 establishes a communication connection once, and sets a drive recorder ID for identifying the other party's drive recorder 1 that has transmitted / received the time information X and the time information Y for a predetermined time (for example, 1 hour). It may be stored until the lapse of time, and the communication connection with the drive recorder 1 identified by the stored drive recorder ID may not be established. Then, there is no waste in the drive recorder 1 repeatedly transmitting and receiving the time information X and the time information Y with the same partner.

As described above, the drive recorder 1f and the drive recorder 1j that have received the time information X and the time information Y from the drive recorder 13I calibrate the time measured by the internal clock 103 of their own device using the received time information Y. Subsequently, the drive recorder 1f is mounted on any vehicle traveling in the vicinity of the vehicle f until a predetermined time (for example, 10 minutes or the like) elapses from the time indicated by the time information X. When the communication connection is successfully established with the drive recorder 1 of the communication connection partner, the time information X received from the drive recorder 1i and the time information X received from the drive recorder 1i and the internal clock 103 of the own device are used for the current time. The time information Y indicating the time is transmitted. The arrow in FIG. 31 indicates that the drive recorder 1f succeeded in establishing a communication connection with the drive recorder 1g and transmitted the time information X and the time information Y to the drive recorder 1g.

Like the drive recorder 1f, the drive recorder 1j is also mounted on any vehicle traveling in the vicinity of the vehicle j from the time indicated by the time information X until a predetermined time (for example, 10 minutes or the like) elapses. When an attempt is made to establish a communication connection with the drive recorder 1 and the communication connection is successfully established, the time information X received from the drive recorder 1i and the internal clock 103 of the own device are sent to the drive recorder 1 of the other party of the communication connection. The time information Y indicating the current time measured is transmitted. The arrow in FIG. 31 indicates that the drive recorder 1j succeeded in establishing a communication connection with the drive recorder 1k and transmitted the time information X and the time information Y to the drive recorder 1k.

As described above, the drive recorder 1 that has received the time information from the neighboring drive recorder 1 transmits the time information to another neighboring drive recorder 1, so that the multiple drive recorders 1 are timed by the internal clock 103. Time is calibrated. At that time, the passenger of the vehicle equipped with those drive recorders 1 does not need to operate the drive recorder 1 for time adjustment.

In the example of FIG. 31, the drive recorder 1h receives the time information from both the drive recorder 1g and the drive recorder 1l. In this case, the drive recorder 1h receives, for example, the time information X associated with the time information Y of the late arrival. Only when the time indicated by is newer than the time indicated by the time information X associated with the first-come-first-served time information Y, one of the time information Y is selected according to a predetermined rule, such as using the second-arrival time information Y, and the selected time. The information Y is used to calibrate the time measured by the internal clock 103.

[Modification example]
In the above-described embodiment, the time information for calibrating the time measured by the internal clock 103 of the drive recorder 1 is generated by the GNSS unit, the time server, or the tablet PC. Some are generated from the image of the clock. Two or more of these may be used. In that case, the type of time information used by the drive recorder 1 for calibrating the internal clock 103 is recorded, and for example, when the image is reproduced, the type of time information used for calibrating the shooting time together with the shooting time of the image. May be displayed, for example, by an icon or the like.

Further, the drive recorder 1 records the position information indicating the position where the time information has been calibrated, and displays, for example, the shooting time of the image and the calibrated position of the shooting time when the image is reproduced. You may.

In addition, the blockchain provides time information used by the drive recorder 1 to calibrate the internal clock 103, its type, and time information indicating the current time (the current time before calibration and the current time after calibration) measured by the internal clock 103. It is good to write in. In this case, the time information or the like may be written to the blockchain in real time by, for example, LPWA (Low Power Wide Area), or may be written to the blockchain when it is imported into the PC viewer, for example. .. In this case, falsification of the time information is prevented.

1 ... Drive recorder, 2 ... Time recorder, 3 ... Time server, 4 ... Data server, 5 ... Surveillance camera, 6 ... Car navigation system, 7 ... Artificial satellite, 8 ... Tablet PC, 9 ... HTTP server, 11 ... Main unit, 12 ... Installation Bracket, 13 ... nut member, 14 ... volume dial, 15 ... DC jack, 16 ... CCD camera, 17 ... memory card, 21 ... display unit, 22 ... operation button, 23 ... reading unit, 24 ... printing unit, 25 ... Internal clock, 26 ... interface, 27 ... control unit, 71 ... groupware server, 72 ... terminal device, 73 ... relay device, 74 ... clock, 75 ... surveillance camera, 76 ... infrared remote control, 77 ... GNSS unit, 78 ... correction Multiplier calculation device, 101 ... Accident detection sensor, 102 ... Temporary storage memory, 103 ... Internal clock, 104 ... Speaker, 105 ... Switch, 106 ... Microphone, 107 ... Control unit, 108 ... Interface, 109 ... Card slot, 110 ... Non-volatile Sex memory, 111 ... 1st case, 112 ... 2nd case, 121 ... ring part, 122 ... mounting plate, 131 ... through hole, 771 ... 1PPS signal output unit, 781 ... operator, 782 ... correction multiplier calculation unit, 783 ... correction multiplier output unit, 900 to 919 ... system, 1000 ... thermometer, 1031 ... oscillator, 1032 ... timing unit, 1111 ... one end, 1121 ... one end, 1221 ... mounting surface.

Claims (20)

A function to acquire information for specifying the time without directly acquiring information from either the time server or the receiving unit of the satellite positioning system and without requiring manual input of information by the user, and the acquired time. A system equipped with a specific means having a function of specifying a time using information for specifying. The function of acquiring the information for specifying the time provided by the specific means requires the user to manually input the information without directly acquiring the information from either the time server or the receiving unit of the satellite positioning system. The system according to claim 1, which has a communication function of receiving information for specifying the time from an external system. The function of acquiring the information for specifying the time included in the specific means receives information for the purpose of notifying the time transmitted from the external system on the network by the communication function, and notifies the time. The system according to claim 2, which has a function of acquiring information for specifying the time from information accompanying information not intended for. The function of acquiring the information for specifying the time provided by the specific means receives information not destined for the own system communicated on the network by the communication function, and is described from the information not destined for the own system. The system according to claim 2 or 3, which has a function of acquiring information for specifying a time. The function of acquiring the information for specifying the time provided by the specific means has a function of acquiring information representing a captured image and acquiring information for specifying the time from the image. The system according to any one of 4 to 4. The claim that the function of acquiring the information for specifying the time provided by the specific means has a function of acquiring information representing the picked-up sound and acquiring information for specifying the time from the sound. The system according to any one of 1 to 5. The claim that the function of acquiring the information for specifying the time provided by the specific means has a function of acquiring the information for specifying the time in a format that can be recognized by the device with higher accuracy than humans can recognize. The system according to any one of 1 to 6. The function of the specific means for acquiring the information for specifying the time acquires the information for specifying the time with the information for error detection and correction, and uses the information for error detection and correction. The system according to any one of claims 1 to 7, which has a function of correcting an error in information for specifying the time by using the information for error detection and correction. The function of acquiring the information for specifying the time included in the specific means has a function of acquiring a plurality of varying pieces of information for specifying the time.
The system according to any one of claims 1 to 8, wherein the function of specifying the time included in the specific means has a function of specifying the time by using a plurality of information for specifying the time with variations. .. It has an oscillator that emits a signal at a predetermined cycle, and has an internal clock that measures the time based on the signal emitted by the oscillator.
The function of acquiring the information for specifying the time provided by the specific means has a function of acquiring information indicating a difference between the predetermined cycle and the reference cycle as information for specifying the time. And
The system according to any one of claims 1 to 9, wherein the specific means has a function of correcting the time measured by the internal clock by using the information indicating the difference. A measuring means for measuring a physical quantity that affects the period in which the oscillator emits a signal is provided.
The function of acquiring the information for specifying the time is a function of acquiring information indicating the period in which the oscillator emits a signal according to the physical quantity measured by the measuring means as the information for specifying the time. The system according to claim 10. The function of acquiring the information for specifying the time is defined as the first function of acquiring the time.
The identification means has a function of acquiring information for directly specifying the time from the time server, a function of acquiring information for directly specifying the time from the receiving unit of the satellite positioning system, and a user's hand. One or more of the functions for acquiring information for specifying the input time is provided as the second function for acquiring.
The system according to claim 10 or 11, wherein the function of correcting the time measured by the internal clock has a function of correcting the time measured by the internal clock using the information acquired by the second acquisition function. A claim comprising a transmission means for transmitting at least one of the information for specifying the time and the information indicating the time specified by using the information for specifying the time to an external system as the information for specifying the time. Item 2. The system according to any one of Items 1 to 12. The system according to any one of claims 1 to 13 is defined as the first system.
A plurality of the above-mentioned first systems are provided.
A second system in which each of the plurality of first systems acquires information for identifying the time from the same information source. The system according to claim 7 is set as the first system.
A third system including an output means for outputting information for specifying the time acquired by the first system in a format that can be recognized by the device with higher accuracy than humans can recognize. The system according to claim 7 is provided as the first system.
A fourth system comprising the third system according to claim 15. The system according to claim 8 is set as the first system.
A third system including an output means for outputting information for specifying the time acquired by the first system as information accompanied by information for error detection and correction. The system according to claim 8 is provided as the first system.
A fourth system comprising the third system according to claim 17. Computer,
A program for functioning as a specific means provided in the system according to any one of claims 1 to 13. Computer,
A program for functioning as an output means included in the third system according to claim 15 or 17.