JP2019012564A - Electronic apparatus and program - Google Patents

Abstract

To provide an electronic apparatus which can view video data by recording it without performing work to transfer the video data and can avoid troublesomeness to perform work to transfer the video data as much as possible and to provide a program.SOLUTION: A drive recorder 1 performs continuous recording for continuously recording video data and intermittent recording for intermittently recording the video data whenever a prescribed event occurs by sharing the same recording region. The drive recorder 1 includes recording control means for deleting at least a part of the video data obtained by intermittently recording the recording region and securing capacity of a recordable region in accordance with the capacity of the recordable region used for continuous recording in the recording region.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electronic device and a program for recording video data.

  2. Description of the Related Art Conventionally, electronic devices such as drive recorders that constantly record video data and record events are known. In the continuous recording, video data is normally recorded without a break when power is supplied to the electronic device from the outside, for example, while the accessory switch is turned on. The accessory switch is a switch that switches between supply of electric power to an accessory such as an audio provided in the vehicle from the vehicle-mounted battery and interruption of the supply of electric power. Event recording records video data triggered by the occurrence of an event such as a dangerous state or accident during operation of the vehicle, such as when the detection value of an acceleration sensor provided in an electronic device exceeds a predetermined threshold. is there.

  As such an electronic device, there are mainly two systems due to the difference in recording method.

  One of these two methods is to manage and record a recording area for constant recording and a recording area for event recording separately (for example, Patent Document 1). According to this method, the number of files that can be recorded in the recording area for constant recording and the number of files that can be recorded in the recording area for event recording are set in advance. When the set number of files is reached in each recording area, the oldest file is overwritten and recording or event recording is always performed. This method has a problem that the recording area cannot be used efficiently when the frequency of event recording is extremely low.

  The other of the above two methods is to manage and record a recording area for constant recording and a recording area for event recording. According to this method, video data is always recorded in the same recording area, and video data is event-recorded every time an event occurs. At this time, if the recording area becomes full of the video data recorded at all times and the video data recorded at the event, the video data recorded at the most time without overwriting the video data already recorded at the event. Overwrite the old video data and perform new continuous recording and event recording. Then, when the recording area is filled with video data obtained by event recording, recording is stopped. According to this method, even when the frequency of event recording is low, the recording capacity can be used efficiently.

JP 2010-74291 A

  However, in a conventional electronic device that manages and records a recording area for constant recording and a recording area for event recording in a unified manner, the recording area is filled with event-recorded video data. In this case, if the recording area is not noticed, the video data cannot be recorded and the video cannot be viewed. There is a problem that it is troublesome because the video data must be manually transferred to another medium, such as being taken out from the device and moved to a hard disk such as a personal computer.

  An object of the present invention is to provide an electronic device capable of recording and viewing video data without performing an operation of transferring video data and the like, and avoiding the inconvenience of performing an operation of transferring video data as much as possible. Is to provide a program.

  (1) An electronic device that performs continuous recording for continuously recording video data and intermittent recording for recording the video data intermittently every time a predetermined event occurs, sharing the same recording area. Then, according to the capacity of the recordable area used for the continuous recording in the recording area, the capacity of the recordable area by erasing at least a part of the video data subjected to the intermittent recording with respect to the recording area It has a recording control means for ensuring the above.

  By doing so, the video data can be recorded and viewed without performing the operation of transferring the video data, and the troublesome work of transferring the video data can be avoided as much as possible. As continuous recording for continuously recording video data, video data should be recorded without interruption for a predetermined time. For example, while the accessory switch of the vehicle is turned on, the electronic device is powered from the outside such as the vehicle. It is good to always record the video data when is supplied. In this way, video data for a predetermined time can be recorded and viewed without omission. The occurrence of the predetermined event may be an event that occurs according to the state of the vehicle or the situation outside the vehicle. For example, when the acceleration value of the vehicle exceeds a threshold value, the current position and a preset view point with a good view If the distance between the current position and the location where the attention is urged, such as a preset intersection or an accident-prone area, may be within the predetermined distance. In addition, the state of the vehicle and the situation outside the vehicle were determined by the distance between the current position of the vehicle determined by positioning using the positioning system and the location where warning is required, such as intersections and accident-prone areas, and by positioning using the positioning system. It may be determined from the distance between the current position of the vehicle and the viewpoint, or the comparison result between the detection value of the sensor provided in the electronic device and the threshold value. For example, the vehicle position obtained by positioning using GPS (Global Positioning System) Whether the distance between the current position and the place where warning is required, such as an intersection or accident-prone area, is within a predetermined distance, and whether the distance between the current position of the vehicle obtained by positioning using GPS and the viewpoint is within a predetermined distance Alternatively, the determination may be made based on whether or not the detected acceleration value in the acceleration sensor is greater than or equal to a threshold value. By doing in this way, according to the present position of the vehicle calculated by positioning using the positioning system or the detection value of the sensor, the video data can be viewed intermittently separately from the continuous recording.

As intermittent recording in which video data is intermittently recorded every time a predetermined event occurs, video data at the time of the event may be recorded for a time shorter than the continuous recording time and including the event occurrence time. For example, the video data when the detected acceleration value detected by the acceleration sensor exceeds the threshold value may be recorded for a time that is shorter than the continuous recording time and includes a time when the detected acceleration value exceeds the threshold value. In this way, video data when an event occurs can be efficiently viewed separately from video data recorded continuously. The recording area may be a predetermined area of a memory card formatted with a predetermined file system, for example, an area for recording video data in a memory card formatted with a FAT (File Allocation Table) format file system. It should be a data area. By doing this, the video data of the continuous recording file created by continuous recording and the video data of the intermittent recording file created by intermittent recording can be recorded in a predetermined area of the memory card and managed as a file. it can. For sharing the same recording area, video data can be recorded continuously or intermittently in the same recording area. For example, each cluster in the data area of a recording medium formatted with a predetermined file system. In addition, video data can be recorded continuously or intermittently. By doing so, the video data is transferred by changing the ratio of the area in which the video data is intermittently recorded and the area in which the video data is continuously recorded in the recording area according to the frequency of the recording. When the work or the like is not performed, the recording area can be used efficiently.

  The capacity of the recordable area used for continuous recording in the recording area may be determined by the minimum management area used for continuous recording in the recording area. For example, video data is recorded in the data area of a recording medium formatted by the file system. In this case, the amount may be determined by the number of clusters in the data area for recording video data of the continuous recording file. By doing so, the capacity of the recordable area for continuous recording can be grasped as part of the management of the video data recorded in the recording area. As the erasure of at least a part of the video data that has been intermittently recorded in the recording area, it is assumed that at least a part of the video data that has been recorded in the past from among the video data that has been intermittently recorded is selected in order. Good. In addition, as at least a part of the erasure, it is preferable to erase all or a part of the video data that has been intermittently recorded in the recording area. In this way, it is possible to preferentially leave video data that has been recorded intermittently with a high possibility of being viewed.

  In order to secure the capacity of the recordable area, it is possible to record for continuous recording when overwriting the continuously recorded video data and newly recording continuously or intermittently without overwriting the intermittently recorded video data. It is good to ensure that the capacity of the area does not immediately disappear due to subsequent intermittent recording. For example, in a data area managed using a file system, a file corresponding to the frequency of intermittent recording in the past predetermined time It is preferable to secure the capacity of the recordable area by deleting a number of intermittent recording files. By doing so, it is possible to prevent frequent occurrence of the process of erasing the intermittently recorded video data.

  (2) When the recording area becomes full due to the continuous recording and the intermittent recording, the recording control means overwrites the video data on which the continuous recording has been performed on the recording area, and newly In addition, the continuous recording and the intermittent recording are performed while the erasing is performed so that the capacity of the recordable area does not become a predetermined value or less.

In this way, the capacity of the recordable area used for continuous recording can always be secured, and video data can be continuously recorded without omission. The case where the capacity of the recording area becomes full due to continuous recording and intermittent recording may be a case where continuous recording and intermittent recording cannot be performed unless the video data recorded in the recording area is overwritten. In this way, video data can be continuously recorded and intermittently recorded until the video data recorded in the recording area cannot be overwritten unless it is overwritten, and the recording area can be used efficiently. Can be made. Continuous recording and intermittent recording by overwriting the video data that has been continuously recorded in the recordable area means overwriting the continuously recorded video data and continuously recording the video data, and when an event occurs. In addition, the video data may be intermittently recorded by overwriting the continuously recorded video data. In this way, video data can be continuously recorded and intermittently recorded even when the operation of transferring the video data is not performed. The capacity of the recordable area may be an amount determined by the minimum management area used for continuous recording in the recording area. For example, when recording video data in the data area of a recording medium formatted by a file system, An amount obtained by multiplying the number of clusters in the data area in which video data is recorded and the capacity of the clusters may be obtained. In this way, the capacity of the recordable area for continuous recording can be grasped as part of the management of the video data recorded in the recording area. As a process of erasing so that the capacity of the recordable area does not become a predetermined value or less, it is preferable to always secure a capacity capable of avoiding a state where continuous recording cannot be performed due to a lack of capacity. When recording video data in the formatted recording area, it is preferable to have a capacity that is secured by deleting 10 intermittent recording files that have been intermittently recorded. In this way, it is possible to avoid a state where continuous recording cannot be performed due to insufficient capacity, so that video data can be continuously recorded without being interrupted.

  (3) When the recording area becomes full due to the continuous recording and the intermittent recording, the recording control means overwrites the video data on which the continuous recording has been performed on the recording area to newly In addition, the continuous recording and the intermittent recording are performed while the erasing is performed when the capacity of the recordable area is exhausted.

  In this way, when the capacity of the recordable area used for continuous recording runs out, the capacity of the recordable area used for continuous recording can be secured. The case where the capacity of the recording area becomes full due to continuous recording and intermittent recording may be a case where continuous recording and intermittent recording cannot be performed unless the video data recorded in the recording area is overwritten. In this way, video data can be continuously recorded and intermittently recorded until the video data recorded in the recording area cannot be overwritten unless it is overwritten, and the recording area can be used efficiently. Can be made. As a process of overwriting the video data that has been continuously recorded in the recording area and continuously recording and intermittent recording, it is possible to overwrite the continuously recorded video data and continuously record the video data, and when an event occurs The video data may be intermittently recorded by overwriting the continuously recorded video data. In this way, video data can be continuously recorded and intermittently recorded even when the operation of transferring the video data is not performed. The capacity of the recordable area may be an amount determined by the minimum management area used for continuous recording in the recording area. For example, when recording video data in the data area of a recording medium formatted by a file system, The number of clusters in the data area for recording video data may be used. In this way, the capacity of the recordable area for continuous recording can be grasped as part of the management of the video data recorded in the recording area. When the capacity of the recordable area runs out, when recording video data of a continuous recording file for each minimum management area of the recording area managed by the file system, it is used for recording video data of the continuous recording file. For example, the minimum possible management area may be eliminated. For example, in a data area managed using a file system, a cluster that can be used for recording video data of a continuous recording file is eliminated. In this way, it is possible to realize an electronic device with a high processing speed in order to perform simple processing only for determining whether or not there is no minimum management area for recording video data of a continuous recording file. In addition, since the processing load is small, an electronic device can be configured with an inexpensive processing apparatus. Furthermore, for example, since the determination circuit, the number of times of deletion, and the like can be reduced, the possibility that video recording is interrupted can be reduced. Therefore, the user can purchase the device at a low cost and more reliably obtain an uninterrupted video than before.

  (4) The recording control means records the video data for each minimum management area of the recording area using a file system, and creates a continuous recording file by the continuous recording, while an intermittent recording file by the intermittent recording. And the capacity of the recordable area is calculated based on the minimum management area where the video data of the continuous recording file is recorded.

By doing in this way, a continuous recording file and an intermittent recording file can be recorded using a file system. As the file system, FAT (File Allocation Table) may be used. In this way, the continuous recording file and the intermittent recording file can be managed separately, and the file recorded by the personal computer or the like can be easily read and reproduced. The continuous recording file is a video data file continuously recorded using a file system, for example, a video data file constantly recorded using a file system, and is given a file name that can be distinguished from other files. Intermittent recording files are
A file in which video data is intermittently recorded for a predetermined time using a file system, for example, a file in which video data is intermittently recorded for one minute including an event occurrence time for each event occurrence using a file system, A file name that can be distinguished from other files is assigned. In this way, it becomes possible to identify the continuous recording file and the intermittent recording file by looking at the file name, and can easily identify them. The minimum management area of the recording area is preferably a cluster. In this way, the video data recorded in the recording area can be managed for each cluster. As a process of calculating the capacity of the recordable area based on the minimum management area, the minimum management area in the recordable area used for recording the video data of the continuous recording file when creating and recording the continuous recording file For example, when recording video data for each cluster of the data area of the recording medium formatted by the file system, the capacity of the recordable area is calculated from the number of clusters used for recording the continuous recording file. It is good to calculate. In this way, the capacity of a recordable area used for continuous recording can be calculated as part of video data management when creating and recording a continuous recording file.

  (5) It further has a notifying means for notifying when performing the erasure.

  In this way, it can be known that the intermittently recorded video data is erased. As notification, it is good to inform the user that the intermittently recorded video data is to be erased by image or sound, and when erasing, it may be before erasing or during erasing, but in particular the erasing or erasing is performed. It is good to set it as the structure which alert | reports in the aspect which a user can recognize having done. In this way, the recorded video data will be erased in order to prevent the recorded video data from being transferred, and it will be notified by image or sound before erasing, during erasing or after erasing. I can get it. As a configuration for notifying that the deletion has been performed in a manner that the user can recognize, for example, it may be configured to display “old event file deleted”. By doing so, it is possible to recognize that the capacity for recording the continuous recording file has been secured by deleting the old event file, and to obtain a sense of security that continuous recording is performed without interruption. be able to.

  (6) The recording control means performs the erasing in order from the oldest video data among the video data recorded in the recording area by the intermittent recording.

  In this way, video data that is highly necessary to be recorded can be left. As old video data, when managing video data as a file using a file system, it may be video data of an intermittent recording file whose file creation time is old. For example, when managing video data as a file using a file system Furthermore, the video data of the intermittent recording file having the old file creation time indicated by the time information recorded in the file management area of the memory card may be used. By doing so, it is possible to erase in batches in order from the intermittent recording file with the oldest file creation time.

  The function of the electronic device may be configured as a program for causing a computer to realize the function.

  According to the present invention, it is possible to record and view video data without performing the operation of transferring the video data, and it is possible to avoid the inconvenience of performing the operation of transferring the video data as much as possible.

It is a block diagram which shows the structure of the electronic device which concerns on the 1st Embodiment of this invention. It is a figure which shows typically the change of the used capacity state of the area | region in the data area of the area | region which recorded the video data of the continuous recording file in the 1st Embodiment of this invention, and the video data of the event recording file. It is a figure which shows typically the change of the used capacity state of the area | region in the data area of the area | region which recorded the video data of the event recording file, and the area | region which recorded the video data of the event recording file in the 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

(First embodiment)
<Configuration of Drive Recorder> The configuration of the drive recorder 1 in the first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a block diagram of a drive recorder 1 in the present embodiment.

  As shown in FIG. 1, a drive recorder 1 that is an example of an electronic device according to the present invention includes a GPS receiver 9, a microwave receiver 10, a wireless receiver 11, an input unit 12, an acceleration sensor 13, The display unit 14, the lamp 15, the speaker 16, the memory card reader 17, the camera 19, the database 20, and the control unit 21.

  The GPS receiver 9 receives a GPS signal transmitted by radio waves from a GPS satellite, and obtains a current position (longitude / latitude) based on the received GPS signal. The GPS receiver 9 outputs the obtained current position to the control unit 21 as current position information. The GPS receiver 9 receives time information sent by radio waves from GPS satellites, and outputs the received time information to the control unit 21.

  The microwave receiver 10 receives a microwave having a predetermined frequency emitted from an external speed measurement device. The microwave receiver 10 detects the signal level of the received microwave and outputs the detection result to the control unit 21.

  When the wireless receiver 11 detects reception of a radio wave in a predetermined frequency band, the wireless receiver 11 outputs the detection result to the control unit 21.

  The input unit 12 is a switch. The input unit 12 detects an external operation and outputs the detection result to the control unit 21.

  The acceleration sensor 13 detects the acceleration applied to the drive recorder 1 and consequently the acceleration applied to the vehicle on which the drive recorder 1 is mounted, and outputs the detected value to the control unit 21.

  The display unit 14 is provided on the front surface of the main body (not shown) of the drive recorder 1 (the surface facing the vehicle rear side (driver side)). The display unit 14 is a liquid crystal display, and performs display described later under the control of the control unit 21.

  The lamp 15 is lit or blinked according to the control of the control unit 21 to give an alarm or notification.

  The speaker 16 issues an alarm or notification by sound or voice according to the control of the control unit 21.

The memory card reader 17 is built inside a card insertion slot in a main body (not shown) of the drive recorder 1 and has a reader / writer function. A memory card 18 is inserted into the memory card reader 17 through a card insertion slot and is detachably mounted. When the memory card 18 is inserted, the memory card reader 17 reads the video data recorded on the memory card 18 under the control of the control unit 21, outputs it to the control unit 21, and is input from the control unit 21. Video data is recorded in the memory card 18.

  The memory card 18 is formatted in the FAT (File Allocation Table) 32 format, and records a file in which video data is recorded. The memory card 18 has a data area that is an area for recording video data, a file management area that is an area for managing the video data as a file, and the like. The data area of the memory card 18 is managed for each cluster having a predetermined capacity using the FAT 32. Here, the cluster is a minimum management area for management using the FAT 32. Further, the capacity of one cluster is, for example, 16 KB.

  The camera 19 is provided in the drive recorder 1 in such a direction that the front of the vehicle can be photographed when the drive recorder 1 is mounted on a dashboard in the vehicle interior. The camera 19 includes an imaging device such as a CCD (charge coupled device) and a lens, detects an image in front of the vehicle incident from the lens by the imaging device, and outputs the image to the control unit 21 as video data.

  The database 20 is an EEPROM (Electrically Erasable Programmable Read-Only Memory) externally attached to the control unit 21. Map data is registered in the database 20 at the time of shipment. In the database 20, position information such as a place for calling attention set in advance is recorded. Here, places to call attention are intersections and accident-prone areas.

  The control unit 21 is a microcomputer, and includes a computer, an EEPROM that stores a program, a RAM (Random Access Memory), an interface, and the like. The control unit 21 is activated when an accessory switch (not shown) provided in the vehicle is turned on, and the computer executes a program stored in the EEPROM, thereby realizing the following operation.

  The control unit 21 records the video data of the constant recording file and the event recording file in the same data area of the memory card 18. The control unit 21 records the video data of the constant recording file and the event recording file while sharing the same data area. Here, the sharing of the data area means that the video data of the recording file can be recorded constantly or the video data of the event recording file can be recorded in each cluster of the data area where the video data is recorded using the file system. Say that you can also.

  The control unit 21 acquires video data from the camera 19 and performs processing of recording the acquired video data on the memory card 18 as a file for every minute, for example. When the recording of the file for one minute is completed, the control unit 21 closes the file, opens the next file, and starts recording. In this way, the control unit 21 performs a process of continuously recording video data in the data area of the memory card 18 (hereinafter referred to as “always recording”) to create a constantly recorded file. For example, the control unit 21 adds the file name of the always-recording file to the alphabet of “NOR” that indicates the always-recorded file and the date and time when the constantly-recorded file is created, and time information that indicates the time when the constantly-recorded file is created. Then, a process for recording information related to the data area in which the video data of the constantly recorded file is recorded in the file management area of the memory card 18 is performed. Here, the information regarding the data area is a cluster number of the data area in which the video data is recorded.

When the detected acceleration value input from the acceleration sensor 13 is equal to or greater than the threshold value, the control unit 21 indicates the current position indicated by the current position information input from the GPS receiver 9 and the position of the alert location read from the database 20. If the distance from the position indicated by the information is less than or equal to the predetermined distance,
When a detection result of receiving a radio wave of a predetermined frequency is input from the wireless receiver 11 or when a detection result of receiving a microwave of a predetermined signal level is input from the microwave receiver 10, an event is generated. Judge that it occurred.

  The control unit 21 converts an always-recorded file that records video data when it is determined that an event has occurred into an event recording file that intermittently records video data for one minute including the event occurrence time each time an event occurs. Perform the change process. Specifically, the control unit 21 changes the alphabet of “NOR” in the file name of the constantly recorded file that records the video data at the time of the event occurrence to, for example, the alphabet of “EVT” indicating the event recording file, and records the event. A file. Thus, the control unit 21 intermittently records video data in the data area of the memory card 18 every time an event occurs. Note that the time information of the event recording file and the information related to the data area are those of the constantly recorded file before the file name is changed.

  When the control unit 21 approaches the position of the position information of the place to call attention recorded in the database 20, an alarm process is performed by blinking or turning on the lamp 15, or an alarm process using a speaker 16 I do. The control unit 21 performs display processing for displaying the video acquired from the normal camera 19 on the display unit 14, and when the pressing of the playback switch provided in the input unit 12 is detected, the memory card reader 17 is used to detect the memory card. Display processing for displaying the video data read from 18 on the display unit 14 is performed.

<Operation of drive recorder>
The operation of the drive recorder 1 in the first embodiment of the present invention will be described with reference to FIG.

  The drive recorder 1 according to the present embodiment operates so as to always ensure a certain amount of capacity of a recordable area used for recording video data of a constantly recorded file in the data area 50.

  FIG. 2 is a diagram schematically showing a change in the used capacity state of the area in the data area 50 of the area where the video data of the constantly recorded file and the area of the event recording file where the video data is recorded in the present embodiment. 2A shows a state where the memory card 18 is initialized. FIG. 2B shows a state in which the video data of the constant recording file and the event recording file has started to be recorded in the data area 50. FIG. 2C shows a state in which the capacity of the data area 50 is full by recording the video data of the constant recording file and the event recording file in the data area 50. FIG. 2D shows a state where the recordable area used for recording the video data of the recording file is eroded by the area where the video data of the event recording file is recorded when the capacity of the data area 50 is full. Yes. FIG. 2E shows a state in which the capacity of the recordable area used for recording the video data of the constantly recorded file is secured.

  The data area 50 of the memory card 18 has a capacity capable of recording 120 recording files (for two hours) at all times. The data area 50 is shared as a recording destination of video data of a constant recording file and an event recording file. At the time of shipment of the drive recorder 1, since the memory card 18 is initialized, as shown in FIG. 2A, the entire area of the data area 50 is a free area A1 where no video data is recorded. At this time, the recordable area K1 used for recording the video data of the constantly recorded file is the entire area of the data area 50.

After installing the shipped drive recorder 1 in the vehicle, the control unit 21 turns on the accessory switch of the vehicle (not shown), and when the detection result of the operation in the overwrite ON mode is input from the input unit 12, Process.

  In the initialized state shown in FIG. 2A, the control unit 21 constantly records the video data in the data area 50 and creates a first one-minute continuous recording file. Further, the control unit 21 displays the file name of the constantly recorded file, the time information indicating the time when the constantly recorded file is created, and the information on the data area in which the video data of the constantly recorded file is recorded. Process to record in the file management area. This process is repeated every minute, whereby an area J1 in which video data of a plurality of constantly recorded files is recorded is created in the data area 50.

  In addition, when the control unit 21 determines that an event has occurred, the control unit 21 performs a process of changing the file name indicating the constantly recorded file in which the video data at the time of the event recording is changed to the file name indicating the event recording file. And an event recording file. Thus, an area E1 in which video data of a plurality of event recording files is recorded is created in the data area 50.

  Next, by repeating the above processing, the video data of the constantly recorded file and the event recording file is recorded in the data area 50. As a result, the area J1 and the area E1 in the data area 50 are expanded as shown in FIG. At this time, the recordable area K1 in the data area 50 is an area composed of the area J1 and the empty area A1.

  Next, the capacity of the data area 50 becomes full by further repeating the above processing. Here, when the capacity of the data area 50 is full, the video data of the recording file and the event recording file cannot be recorded in the data area 50 unless the video data file recorded in the data area 50 is overwritten. Say. As shown in the figure, the data area 50 in this state is a state filled with the area J1 and the area E1, as shown in FIG. At this time, the recordable area K1 in the data area 50 coincides with the area J1.

  Next, the control unit 21 looks at the information about the data area recorded in the file management area of the memory card 18 and the time information, and changes the video data of the constantly recorded file created at the oldest time among the constantly recorded files. Overwriting is performed to newly record video data constantly, and a constantly recorded file is created.

  Further, when the control unit 21 determines that an event has occurred, the control unit 21 changes the constant recording file in which the video data at the time of the event recording is recorded to the event recording file. By repeating these processes, in the data area 50, as shown in FIG. 2D, the area J1 that coincides with the recordable area K1 is eroded by the area E1.

  In the above process, the control unit 21 calculates the capacity of the recordable area K1 based on the information on the file name and the data area recorded in the file management area of the memory card 18, and records the recordable area from the calculation result. It is determined whether or not the capacity of K1 is secured.

Specifically, the control unit 21 looks at information on the file name and the data area recorded in the file management area of the memory card 18 and sets, for example, 435 and 445 as the total number of clusters in the free area A1 and the area J1. For example, 8000 is calculated as the number of clusters necessary for recording one continuous recording file next time. Then, the control unit 21 subtracts 8000, which is the number of clusters necessary for recording one continuous recording file next time, from 435,445 which is the total number of clusters in the free area A1 and the area J1. 427 and 445 are obtained, and the subtracted values 427 and 445 are multiplied by, for example, 32 KB which is the size of one cluster to obtain 13,678 and 240 KB as multiplication values indicating the capacity of the recordable area K1. The control unit 21 determines that the capacity of the recordable area K1 is not secured when the multiplication value is, for example, 512,000 KB or less which is a size of a cluster necessary for recording two constantly recorded files. . When there is no free area A1, the capacity of the recordable area K1 is obtained using the total number of clusters in the area J1.

  When the control unit 21 determines that the capacity of the recordable area K1 is not secured, the control unit 21 looks at the file name and time information recorded in the file management area of the memory card 18 and records them in the data area 50. Of the event recording files, for example, five event recording files selected in order from the oldest created time are deleted. As a result, as shown in FIG. 2 (e), a new area J2 for recording the video data of the constantly recorded file is secured in the data area 50. At this time, the display unit 14 performs notification by displaying characters such as “old event file deleted” under the control of the control unit 21. As a result of the above processing, the area J1 and the area J2 are secured in the data area 50 as the recordable area K1.

  Next, the control unit 21 performs a process of constantly recording video data in the area J2, and creates a constantly recorded file.

  Further, when the control unit 21 determines that an event has occurred while sequentially recording video data sequentially in the area J2, the file name indicating the constantly recorded file in which the video data at the time of event occurrence is recorded. Is changed to a file name indicating an event recording file to obtain an event recording file. Thereby, the area E1 is expanded.

  When the control unit 21 determines again that the capacity of the recordable area K1 is not secured, the control unit 21 repeats the same processing as described above in order to secure the capacity of the recordable area K1.

  When the accessory switch (not shown) is turned ON, and the detection result of the operation in the overwrite OFF mode is input from the input unit 12, the control unit 21 is in the data area when the state shown in FIG. At 50, the process of recording the video data of the constant recording file and the event recording file is stopped. At this time, the display unit 14 displays a POPUP message to stop recording under the control of the control unit 21. In addition, the speaker 16 notifies the stop of recording with a notification sound under the control of the control unit 21. Thereby, the user of the drive recorder 1 can recognize that the process of recording the video data of the recording file and the event recording file in the data area 50 of the memory card 18 is stopped.

(Second Embodiment)
The configuration of the drive recorder, which is an example of the electronic apparatus according to the second embodiment of the present invention, is the same as that shown in FIG.

<Operation of drive recorder>
The operation of the drive recorder 1 in the present embodiment will be described with reference to FIG. The operation of the drive recorder in the present embodiment will be described using the reference numerals in FIG.

  The drive recorder 1 according to the present embodiment operates to secure a certain amount of the recordable area when the capacity of the recordable area used for recording the video data of the constantly recorded file in the data area 60 runs out. .

FIG. 3 is a diagram schematically showing a change in the used capacity state of the area in the data area of the area where the video data of the constantly recorded file and the area of the event recording file where the video data is recorded in the present embodiment. 3, FIG. 3 (a) shows a state in which the memory card 18 is initialized. FIG. 3B shows a state in which the video data of the constant recording file and the event recording file has started to be recorded in the data area 60. FIG. 3C shows a state in which the capacity of the data area 60 is full by recording the video data of the constant recording file and the event recording file in the data area 60. FIG. 3D shows a state where the data area 60 is filled with an area where video data of an event recording file is recorded. FIG. 3E shows a state in which the capacity of the recordable area used for recording the video data of the constantly recorded file is secured.

  The memory card 18 has a recording capacity capable of recording 120 recording files (for two hours) at all times in the data area 60, for example. The data area 60 is shared as a recording destination of video data of a constant recording file and an event recording file. Since the memory card 18 is initialized when the drive recorder 1 is shipped, as shown in FIG. 3A, the entire data area 60 is a free area A11 where no video data is recorded. At this time, the recordable area K11 used for recording the video data of the constantly recorded file is the entire area of the data area 60.

  The control unit 21 performs the following processing when an accessory switch (not shown) is turned ON and a detection result of an operation in the overwrite ON mode is further input from the input unit 12.

  The control unit 21 performs the same processing as in the first embodiment up to FIG. As a result, the data area 60 is in the state of FIG. 3C filled with the area J11 where the video data of the constantly recorded file is recorded and the area E11 where the video data of the event recording file is recorded. At this time, the recordable area K11 coincides with the area J11 where the video data of the constantly recorded file is recorded.

  Next, the control unit 21 looks at the information about the data area recorded in the file management area of the memory card 18 and the time information, and changes the video data of the constantly recorded file created at the oldest time among the constantly recorded files. Overwriting is performed to newly record video data constantly, and a constantly recorded file is created. Further, the control unit 21 displays the file name of the constantly recorded file, the time information indicating the time when the constantly recorded file is created, and the information on the data area in which the video data of the constantly recorded file is recorded. Process to record in the file management area.

  If the control unit 21 determines that an event has occurred, the control unit 21 performs a process of changing the file name indicating the constantly recorded file in which the video data at the time of the event recording is changed to the file name indicating the event recording file, It is an event recording file. In addition, the control unit 21 displays the file name of the event recording file, time information indicating the time at which the event recording file is created, and information on the data area in which the video data of the event recording file is recorded. Process to record in the file management area. By repeating this process, the data area 60 is gradually eroded by the area E11 in which the video data of the event recording file is recorded, and the area J11 that coincides with the recordable area K11 is finally filled with the area E11. It will be in the state of (d).

  In the above process, the control unit 21 calculates the capacity of the recordable area K11 based on the information on the file name and the data area recorded in the file management area of the memory card 18, and records the recordable area from the calculation result. It is determined whether or not the capacity of K11 has been exhausted.

Specifically, the control unit 21 calculates information on the file name and data area recorded in the file management area of the memory card 18 and calculates the number of clusters in the area J11 indicating the capacity of the recordable area K11. When the calculated value is “0”, the control unit 21 determines that the capacity of the recordable area K11 has run out.

  When the control unit 21 determines that the capacity of the recordable area K11 has been exhausted, the event recording file recorded in the data area 60 is viewed from the file name and time information recorded in the file management area of the memory card 18. Among them, a predetermined number of event recording files selected in order from the oldest created time are deleted. As a result, as shown in FIG. 3E, a new area J12 for recording video data of a constantly recorded file is secured in the data area 60. At this time, the display unit 14 performs notification by displaying characters such as “old event file deleted” under the control of the control unit 21. As a result of the above processing, the area J12 is secured in the data area 60 as the recordable area K11.

  The area J12 is preferably set so that the timing at which the area where the video data of the recording file of the recording file is constantly recorded disappears does not come too early in the data area 60. For example, the area J12 is an area secured by deleting 10 event recording files. .

  When the control unit 21 determines again that the capacity of the recordable area K11 has run out, the control unit 21 repeats the same processing as described above in order to secure the capacity of the recordable area K11.

  When the accessory switch (not shown) is turned ON and the detection result of the operation in the overwrite OFF mode is further input from the input unit 12, the control unit 21 is in the data area when the state shown in FIG. At 60, the process of recording the video data of the constant recording file and the event recording file is stopped. At this time, the display unit 14 displays a POPUP message to stop recording under the control of the control unit 21. In addition, the speaker 16 notifies the stop of recording with a notification sound under the control of the control unit 21. Thereby, the user of the drive recorder 1 can recognize that the process of recording the video data of the recording file and the event recording file in the data area 60 of the memory card 18 is stopped.

  According to the present embodiment, when it is determined whether or not a predetermined amount of the capacity of the recordable area K11 is to be secured, the number of clusters in the area J11 in which the video data of the recording file is always recorded is calculated. Since it is only necessary to determine whether or not the value is “0”, the processing can be simplified, and the user of the drive recorder 1 can use the drive recorder 1 having a high processing speed.

<Other embodiments>
You may make it switch the function which the drive recorder 1 of 1st Embodiment has, and the function which the drive recorder 1 of 2nd Embodiment has with the switch provided in the drive recorder 1. FIG.

In the first embodiment and the second embodiment, a predetermined number of event recording files are deleted when the capacity of the recordable area K1 is not ensured or when the recordable area K11 runs out. The number of event recording files corresponding to the frequency of recording the event recording files in the predetermined time may be deleted. In this case, the control unit 21 stores in advance in the EEPROM of the control unit 21 a table in which the ratio of the time when the video data of the event recording file in the predetermined time is recorded and the number of files to be deleted are associated with each other. . The control unit 21 uses the real-time clock function of the control unit 21 or time information input from the GPS receiver 9 to measure the predetermined time and the time when the video data of the event recording file is recorded, and the measurement result From the above, the above percentage is calculated. Then, the control unit 21 erases the event recording files by the number of files to be erased associated with the calculated percentage in the table. As a result, the number of event recording files corresponding to the recording time of the event recording file can be deleted, so that the processing for deleting the event recording file can be prevented from frequently occurring.

  In the first embodiment and the second embodiment, the camera 19 is provided in the drive recorder 1 in such a direction that the front of the vehicle can be photographed when the drive recorder 1 is mounted on a dashboard in the vehicle interior. However, the drive recorder 1 may be provided in such a direction that the rear of the vehicle can be photographed. Further, the camera 19 may be provided in the drive recorder 1 in such a direction that the side of the vehicle can be photographed. Furthermore, the camera 19 may be provided in the drive recorder 1 in such a direction as to enable photographing of the interior of the vehicle.

  In the first embodiment and the second embodiment, FAT is used as the file system. However, a file system such as NTFS (NTFile System) other than FAT may be used.

  In the first and second embodiments, the video data of the recording file and the event recording file are always recorded by the drive recorder 1 having the functions of the navigation device and the radar detector. Always record video data of event recording files and event recording files with a drive recorder that has only the function of a drive recorder that does not have a machine function, a drive recorder that has a function of a navigation device, or a drive recorder that has a function of a radar detector May be.

  In the first embodiment and the second embodiment, the event record file is created when the distance between the current position of the vehicle and the place to call attention is equal to or less than a predetermined distance. An event record file may be created when the distance to a view point with a good view that is preset and stored in the database 20 is equal to or less than a predetermined distance.

  In the first embodiment and the second embodiment, when the recordable area is secured, a part of the recorded event record file is deleted, but the entire recorded event record file is deleted. May be.

DESCRIPTION OF SYMBOLS 1 Drive recorder 9 GPS receiver 10 Microwave receiver 11 Wireless receiver 12 Input part 13 Acceleration sensor 14 Display part 15 Lamp 16 Speaker 17 Memory card reader 18 Memory card 19 Camera 20 Database 21 Control part 50 Data area 60 Data area

Claims (3)

An electronic device that performs shared and continuous recording for continuously recording image data, and event recording that records the video data each time a predetermined event occurs, the same recording area,
According to the capacity of the recordable area used for the continuous recording in the recording area, the capacity of the recordable area is secured by erasing at least a part of the video data on which the event recording has been performed on the recording area. the recording control means to possess,
The electronic apparatus according to claim 1, wherein erasing at least a part of the video data on which the event recording has been performed is to delete an amount of event records corresponding to a frequency of event recording in a predetermined past time . The amount according to the frequency of event recording in the past predetermined time is an amount corresponding to a ratio of time for recording video data of event recording in the predetermined time. Electronics.   The program for making a computer implement | achieve the function of the electronic device of Claim 1 or 2.

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