JP2013197842A - Drive recorder - Google Patents

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Publication number
JP2013197842A
JP2013197842A JP2012062313A JP2012062313A JP2013197842A JP 2013197842 A JP2013197842 A JP 2013197842A JP 2012062313 A JP2012062313 A JP 2012062313A JP 2012062313 A JP2012062313 A JP 2012062313A JP 2013197842 A JP2013197842 A JP 2013197842A
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control unit
video data
unit
data
recording
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JP5836169B2 (en
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Junichi Kagoshima
順一 鹿子島
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Kayaba Ind Co Ltd
カヤバ工業株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a drive recorder for recording video data and audio data of a vehicle.SOLUTION: A drive recorder comprises a camera 12, an image processing unit 140, a recording control unit 150, and a control unit 160. The control unit 160, when causing the recording control unit 150 to record video data, divides the video data into division data pieces with a predetermined size, encrypts a part of each of the divided division data pieces, and causes the recording control unit 150 to record the video data including the encrypted parts.

Description

  The present invention relates to a drive recorder that is mounted on a vehicle and records video data.

  A drive recorder that records driving data of a vehicle together with video data is mounted on the vehicle. For example, when an impact occurs in the vehicle, the drive recorder is configured to acquire video data for a predetermined time before and after the time when the impact occurred and to record the data in a memory card.

  The video data recorded by the drive recorder is evidence of the cause of the vehicle accident, and requires data reliability and identity. For this reason, measures such as encryption are generally taken to prevent tampering.

  Patent Document 1 discloses a data encryption method for encrypting encoded information (Huffman table or quantization table) included in header information of JPEG data using a pre-registered encryption key.

JP 2007-208931 A

  An MPEG4 format moving image compression format is known as a recording format for moving image information. The MPEG4 format is a moving image format recorded by inter-frame compression, but even if it tries to extract still image data that is a single frame from the moving image, this compression method reduces the sharpness of the still image data, Evidence is inferior.

  An image compression standard called motion JPEG format is also known. The motion JPEG format is a continuous recording of JPEG format image data, and does not perform compression between frames. Therefore, since the sharpness when extracting still image data which is a single frame from video data is higher than that of the MPEG4 format, the evidence capability is increased.

  However, since the motion JPEG method does not perform inter-frame compression, the file size of the recorded video data is larger than that of the MPEG method. Therefore, when video data recorded by the motion JPEG method is encrypted, there is a problem that the processing load for encryption becomes large.

  Here, for each JPEG format image included in the motion JPEG, the processing load can be reduced by encrypting only the header information as described in Patent Document 1 described above.

  However, if only predetermined information such as header information is encrypted with an encryption key, the encrypted data becomes a fixed pattern, and the encrypted portion is easily discriminated by a third party, and the video data may be altered. There was a problem that there was.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a drive recorder that can reduce the processing load of video data encryption and prevent falsification of video data in the drive recorder. To do.

  The present invention is mounted on a vehicle and acquires a video data, an image processing unit that encodes the video data acquired by the camera and generates moving image data that is a set of unit images, and is encoded by the image processing unit. A recording control unit that controls the recording of the moving image data, and a control unit that controls the image processing unit and the recording control unit. When the moving image data is recorded by the recording control unit, the control unit stores the moving image data in a predetermined manner. Dividing into divided data of a size, a part of each of the divided divided data is encrypted, and video data including the encrypted part is recorded by a recording control unit.

  According to the present invention, video data is divided into divided data of a predetermined size, and a part of each divided data is encrypted. As a result, processing is easier than encrypting the entire video data, and the processing burden for encryption can be reduced. Further, since the video data is encrypted for each divided data divided into a predetermined size, the encrypted data does not have a fixed pattern. Thereby, since it is difficult for a third party to determine the encrypted portion, it is possible to prevent falsification of the moving image data.

It is explanatory drawing of the drive recorder system containing the drive recorder of embodiment of this invention. It is a functional block diagram of the drive recorder of the embodiment of the present invention. It is explanatory drawing which shows the recording process of the video data and audio | voice data of embodiment of this invention. It is explanatory drawing of the recording process of the video data of embodiment of this invention. It is a flowchart of the recording process of the unit video data of the embodiment of the present invention. It is explanatory drawing of the unit video data of other embodiment of this invention. 6A is an explanatory diagram of unit video data according to another embodiment of the present invention, and FIG. 6B is an explanatory diagram of unit image data according to still another embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an explanatory diagram of a drive recorder system 1 including a drive recorder 10 according to an embodiment of the present invention.

  The drive recorder system 1 includes a drive recorder 10 mounted on a vehicle 11, a personal computer (hereinafter referred to as “PC”) 20 installed in an office, etc., and a memory card that records data acquired by the drive recorder 10. 30.

  The drive recorder 10 acquires travel data (for example, vehicle speed, engine speed, latitude, longitude, etc.) from the vehicle 11, and records these at predetermined time intervals together with date / time information. In addition, a camera 12 is connected to the drive recorder 10, and video data acquired by the camera 12 is recorded. In addition, a microphone 192 is connected to the drive recorder 10, and audio data acquired by the microphone 192 is recorded. The travel data, video data, and audio data are recorded on the memory card 30 via the recording control unit 150.

  The drive recorder 10 includes a recording control unit 150 that writes and reads data to and from the memory card 30 with the memory card 30 inserted, and a recording button 180 that artificially records video data on the memory card 30. And an LED 193 for displaying the state of the drive recorder 10 according to the lighting state (color, blinking, etc.).

  The PC 20 includes a memory card interface 21 that writes data to and reads data from the memory card 30 with the memory card 30 inserted, a display unit 22 that includes a liquid crystal display that can display video data, and the like. And an input unit 23 composed of a keyboard and a mouse capable of inputting instructions.

  The memory card 30 is configured to be readable and writable by the recording control unit 150 and the memory card interface 21. For example, a flash memory card such as SD (Secure Digital) or CF (Compact Flash (registered trademark)) is used.

  FIG. 2 is a functional block diagram of the drive recorder 10 according to the embodiment of the present invention.

  The drive recorder 10 includes an image processing unit 140, an internal memory 130, a recording control unit 150, a control unit 160, an acceleration sensor 170, a recording button 180, a sound control unit 190, and a power control unit 200. Prepare. The control unit 160 is connected to the image processing unit 140, the internal memory 130, the recording control unit 150, the acceleration sensor 170, the recording button 180, the voice control unit 190, and the power supply control unit 200, and controls these units. The control unit 160 is connected to the LED 193 and outputs a signal for controlling the lighting state of the LED 193. The control unit 160 is connected to the flash ROM 120 and controls reading of data recorded in the flash ROM 120.

  The image processing unit 140 performs image processing on the video signal received from the camera 12 based on a predetermined encoding method. The internal memory 130 temporarily records the video data encoded by the image processing unit 140. The recording control unit 150 records the video data on the memory card 30 inserted in the recording control unit 150.

  In the present embodiment, the image processing unit 140 encodes video data as a unit image in the JPEG format every predetermined time unit, and the motion JPEG format (M -JPEG format) video data.

  The internal memory 130 includes a buffer area composed of a volatile memory such as SDRAM, and is used as a buffer for temporarily recording video data when video data is recorded on the memory card 30 under the control of the control unit 160.

  The flash ROM 120 is composed of a non-volatile memory such as a flash memory, and is configured to retain recorded data even after the power supplied to the drive recorder 10 is cut off and the operation of the drive recorder 10 is stopped. Has been. The flash ROM 120 records programs and setting data related to the operation of the drive recorder.

  The acceleration sensor 170 detects the acceleration applied to the vehicle 11, and notifies the control unit 160 of the detection of the occurrence of an event when the detected acceleration exceeds a predetermined threshold. Regardless of whether the acceleration sensor 170 detects the occurrence of an event, the recording button 180 notifies the occurrence of the event to the control unit 160 when operated by the driver. The control unit 160 determines that an event such as an impact has occurred in the vehicle 11 when the event is detected from the acceleration sensor 170 or when the event is detected by operating the recording button 180 by the driver. Then, the video data recorded within a predetermined time before and after the event occurrence time is extracted from the buffer area of the internal memory 130. The extracted video data is recorded on the memory card 30 via the recording control unit 150.

  The voice control unit 190 controls voice recording and playback. A speaker 191 and a microphone 192 are connected to the audio control unit 190. Under the control of the control unit 160, the audio control unit 190 acquires audio around the drive recorder 10 with the microphone 192 when video data is being recorded, and records the acquired audio data in the internal memory 130. In addition, the voice control unit 190 operates a voice or a warning sound related to the operation of the drive recorder 10 (for example, a warning sound that the memory card 30 is not inserted) through the speaker 191 under the control of the control unit 160. The person in charge.

  The audio data recorded by the audio control unit 190 is sampled and quantized by, for example, a linear PCM method (LPCM method). The linear PCM method is a recording format in which the recording time from the beginning changes in accordance with the number of bits (offset) from the beginning of the audio data because the amount of audio data to be recorded is fixed.

  The power control unit 200 receives power from the vehicle 11 and supplies power to each unit via the control unit 160 and the control unit 160. The power supply control unit 200 has a built-in battery, and is configured to supply power to the control unit 160 and each unit for a certain period of time even when the supply of power from the vehicle 11 is cut off.

  Next, the operation of the drive recorder 10 configured as described above will be described.

  FIG. 3 is an explanatory diagram illustrating recording processing of the video data 201 and the audio data 210 executed by the control unit 160 according to the present embodiment.

  The video signal acquired by the camera 12 is encoded in a predetermined encoding method (JPEG format) by the image processing unit 140 and is constantly recorded in the internal memory 130 as video data 201 in the motion JPEG format. The video data 201 is a set of unit images 204 in JPEG format, and the unit images 204 are recorded in chronological order.

  The sound input to the microphone 192 is converted into digital data by the sound control unit 190 and recorded in the internal memory 130 as sound data 210. The audio data 210 is composed of digital data in linear PCM format.

  Here, when the acceleration sensor 170 detects an event such as an impact or when an event is detected by operating the recording button 180, the control unit 160 uses the video data 201 and audio data 210 recorded in the internal memory 130. , Data recorded within a predetermined time before and after the time when the event was detected (for example, 12 seconds before the event occurrence and 8 seconds after the event occurrence) are extracted, and these are extracted as unit video data 202 and unit audio data 211 Extract. The extracted unit video data 202 and unit audio data 211 are recorded on the memory card 30 via the recording control unit 150.

  When the unit video data 202 is recorded on the memory card 30, the control unit 160 performs an encryption process on the unit video data 202. By performing the encryption processing of the unit video data 202, there is no possibility that the unit video data 202 recorded in the memory card 30 will be read or altered by a third party.

  Next, encryption processing in the embodiment of the present invention will be described.

  FIG. 4 is an explanatory diagram of the encryption processing of the unit video data 202 performed by the control unit 160 of the present embodiment.

  The control unit 160 acquires the unit video data 202 recorded within a predetermined time before and after the time when the event is detected from the internal memory 130. In this unit video data 202, unit images 204 in JPEG format are recorded continuously in time series.

  The unit image 204 includes a sequence header (SH) area 214 and a data area 215. In the SH area 214, information indicating that it is in the JEPG format, encoding information (Huffman table or quantization table) of data recorded in the data area, and the like are recorded. The SH area 214 generally has a capacity of several tens to several hundreds bytes. In the data area 215, binary data of an image encoded by the JPEG method is recorded.

  After acquiring the unit video data 202 from the internal memory 130, the control unit 160 generates the acquired unit video data 202 as divided data 205 divided into a predetermined size. This predetermined size is the writing block size of the memory card 30 as will be described later. The control unit 160 divides the unit video data 202 into a predetermined size regardless of the boundary of the unit image 204 from the head portion.

  Next, the control unit 160 performs an encryption process on each of the divided divided data 205. In the encryption process, the control unit 160 encrypts each of the top areas 216 of the divided data 205 using a predetermined encryption key.

  The encryption key is created as a character string that is unique within the drive recorder 10 using, for example, a hash function. The encryption key has a numerical value of 0 to 255, for example. The control unit 160 performs encryption using a technique such as bit shift using the encryption key. The control unit 160 encrypts all the head region 216 of the divided data 205 divided from the unit video data 202.

  Note that the area 216 at the beginning of the divided data 205 to be encrypted is preferably variable length based on the encryption key. For example, when the encryption key takes a value from 0 to 255, the area from the head portion of the divided data 205 to 1 to 256 bits is set as the area 216, and this area 216 is encrypted. By making the area to be encrypted variable-length in this way, it is possible to prevent the encrypted part from being discriminated by a third party.

  Furthermore, as a more specific example of the present embodiment, the recording control unit 150 can perform a process of dividing the unit video data 202 into divided data 205 of a predetermined size.

  When the controller 160 requests the unit video data 202 to be written, the recording controller 150 divides the requested unit video data 202 into the write block size of the memory card 30 and sequentially stores the divided data in the memory card. Send to 30. The recording control unit 150 performs writing to and reading from the memory card 30 in units of the writing block size.

  Therefore, the recording control unit 150 performs the encryption process on the divided data 205 divided by the process of the control unit 160 in addition to the process of dividing the unit video data 202 into the writing block size (for example, 2 Kbytes). The encrypted divided data 205 can be written to the memory card 30.

  The process of dividing the unit video data 202 performed by the recording control unit 150 into the writing block size is a process performed during normal writing and reading, and the processing load on the recording control unit 150 does not increase. In addition, since the area where the encryption process is performed is small (several to several hundred bits), the processing load of the encryption process performed by the control unit 160 is small. Therefore, the processing load for encryption does not increase.

  When the unit video data 202 thus encrypted and recorded on the memory card 30 is reproduced on the PC 20, the following processing is performed.

  Also in the memory card interface 21 of the PC 20, the unit video data 202 recorded on the memory card 30 is read in the writing block size unit, that is, in the divided data 205 unit, similarly to the processing of the recording control unit 150 described above. .

  In the PC 20, the head portion of the read divided data 205 is decrypted with the encryption key. By using the same hash function as that of the drive recorder 10 as the encryption key, it is possible to generate an encryption key common to the drive recorder 10 and to decrypt the read divided data 205. The PC 20 can reconstruct the unit video data 202 by concatenating the read divided data 205 into the unit video data 202.

  FIG. 5 is a flowchart of the recording process of the unit video data 202 and the unit audio data 211 executed by the control unit 160 according to the embodiment of the present invention.

  As described above, the control unit 160 always records the video data 201 acquired by the camera 12 and encoded by the image processing unit 140 in the internal memory 130 (step S10).

  When the video data 201 is recorded in the internal memory 130, the control unit 160 determines whether an event is detected by the acceleration sensor 170 or the recording button 180 (step S11). If no event is detected, the process returns to step S10, and recording of the video data 201 and the audio data 210 is continued.

  When it is determined in step S11 that an event has been detected, the control unit 160 stores, as unit video data 202 and unit audio data 211, recorded from the internal memory 130 within a predetermined time before and after the time at which the event was detected. Extract (step S12).

  Next, the control unit 160 divides the extracted unit video data 202 into divided data 205 having a writing block size (step S13). Note that this processing may be executed by the recording control unit 150 as described above.

  Next, the control unit 160 encrypts the head portion of each divided data 205 divided in units of write access blocks with the encryption key as described above (step S14).

  Next, the control unit 160 controls the recording control unit 150 to sequentially output the encrypted divided data 205 to the memory card 30. In the memory card 30, the divided data 205 in units of write access blocks are sequentially written and recorded as unit video data 202 (step S15). At this time, the acquired unit audio data 211 is also output from the recording control unit 150. As a result, the unit video data 202 and the unit audio data 211 are recorded on the memory card 30.

  By such control, the drive recorder 10 can encrypt and record the unit video data 202 recorded within a predetermined time before and after the time when the event is detected.

  As described above, the drive recorder 10 according to the embodiment of the present invention is a set of the unit image 204 that is mounted on the vehicle 11 and that acquires the video signal and encodes the video signal acquired by the camera 12. An image processing unit 140 that generates the video data 201, a recording control unit 150 that controls recording of the video data 201 generated by the image processing unit 140, and a control unit 160 that controls the image processing unit 140 and the recording control unit 150. When the recording control unit 150 records the video data 201 as unit video data 202, the control unit 160 divides the unit video data 202 into divided data 205 of a predetermined size, and for each divided divided data 205 , A part of each is encrypted, and the recorded unit video data 202 is recorded by the recording control unit 150 Sea urchin was constructed.

  With this configuration, in the encryption process performed by the control unit 160, only a partial area of the divided data 205 constituting the unit video data 202 is encrypted, so the entire unit video data 202 is encrypted. Thus, the processing becomes easier and the processing load for encryption can be reduced.

  Further, since the control unit 160 encrypts a part of each divided data 205, the encrypted data is distributed and arranged in the unit video data 202, and the encrypted part is transmitted to a third party. Is difficult to discriminate, so that the unit video data 202 can be prevented from being falsified.

  Further, the memory card 30 is composed of a flash memory, and the unit video data 202 is divided for each write block size of the memory card 30. Data to be written in the writing process between the recording control unit 150 and the memory card 30 is usually performed by dividing the data for each writing block size, and the burden of the dividing process does not increase.

  Further, since the control unit 160 encrypts the head part of each of the divided data 205, the encryption process can be performed without referring to the contents of the divided data 205, and the burden of the encryption process does not increase.

  Further, the drive recorder 10 includes an audio control unit 190 that acquires audio as audio data, and the control unit 160 transmits unit audio data 211 corresponding to the time when the unit video data 202 is recorded via the recording control unit 150. Thus, the drive recorder 10 can record the unit audio data 211 recorded at the corresponding time in addition to the unit video data 202.

  In addition, since the drive recorder 10 includes the acceleration sensor 170 or the recording button 180 as an event detection unit that detects an event, when the acceleration sensor 170 detects an impact or when a user operation is detected by the recording button 180, An event is detected, and unit video data 202 and unit audio data 211 recorded at a predetermined time before and after the event occurrence time can be recorded.

  In the embodiment of the present invention, the unit video data 202 and the unit audio data 211 are recorded on the memory card 30 as separate files. However, the present invention is not limited to this. As another embodiment, as shown in FIG. 6A, unit audio 212 is generated by dividing unit audio data 211 by a predetermined unit, and unit video data 202 includes unit image 204 and unit audio 212. Can be data. For example, the unit sound 212 of the amount corresponding to the time series of the unit image 204 is recorded every several unit images 204.

  Even when the unit video data 202 is configured in this way, as described above, the unit video data 202 is divided into the divided data 205 for each write access block regardless of the arrangement of the unit image 204 and the unit sound 212. Each of the divided divided data 205 is encrypted and sequentially recorded on the memory card 30 via the recording control unit 150.

  In the embodiment of the present invention, the example in which the SH area 214 is recorded in each of the unit images 204 included in the unit video data 202 is shown, but the present invention is not limited to this. As another embodiment, as shown in FIG. 6B, an SH area 214 having a Huffman code table and a quantization table common to all unit images 204 is recorded at the top of one unit video data 202. Thereafter, the unit video data 202 may be configured to continuously record the data area 215 as the unit image 204.

  Even when the unit video data 202 is configured in this way, as described above, the unit video data 202 is divided into the divided data 205 for each write access block regardless of the structure of the unit image 204. Each of the divided divided data 205 is encrypted and sequentially recorded on the memory card 30 via the recording control unit 150.

  As described above, even if the configuration of the unit video data 202 is different, the divided data 205 is divided for each write access block, and the divided divided data 205 is encrypted and recorded in the memory card 30. As a result, the processing load for encryption can be reduced. Further, since it is difficult for a third party to identify the encrypted portion, the unit video data 202 can be prevented from being falsified.

  It goes without saying that the present invention is not limited to the above-described embodiments, and includes various modifications and improvements that can be made within the scope of the technical idea.

1 Drive Recorder System 10 Drive Recorder 11 Vehicle 12 Camera 20 Personal Computer (PC)
30 Memory card 120 Flash ROM
130 Internal Memory 140 Image Processing Unit 150 Recording Control Unit 160 Control Unit

Claims (5)

  1. A camera mounted on a vehicle and acquiring a video signal;
    An image processing unit that generates video data that is a set of unit images from the video signal acquired by the camera;
    A recording control unit that controls recording of the video data generated by the image processing unit;
    A control unit that controls the image processing unit and the recording control unit,
    The controller is
    When recording the video data by the recording control unit,
    The video data is divided into divided data of a predetermined size,
    For each of the divided data divided, a part of each is encrypted,
    A drive recorder that causes the recording control unit to record the video data including the encrypted portion.
  2. The recording control unit records the video data in a recording unit including a flash memory;
    The drive recorder according to claim 1, wherein the predetermined size is a writing block size of the recording unit.
  3.   The drive recorder according to claim 1, wherein the control unit encrypts a head portion of each of the divided data.
  4. It has a voice control unit that acquires voice as voice data,
    4. The drive recorder according to claim 1, wherein the control unit causes the recording control unit to record audio data corresponding to a time when the video data is recorded. 5.
  5. It has an event detector that detects events,
    The controller is
    2. The video data recorded at a predetermined time before and after an event occurrence time is recorded by the recording control unit when the event detection unit detects an event occurring in the vehicle. 5. The drive recorder according to any one of 4 to 4.
JP2012062313A 2012-03-19 2012-03-19 Drive recorder Active JP5836169B2 (en)

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Citations (6)

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JP2006345491A (en) * 2005-05-09 2006-12-21 Nikon Corp Imaging apparatus and drive recorder system
JP2008140334A (en) * 2006-12-05 2008-06-19 Asahi Research Kk Photographed image recording and reproducing device
JP2010074339A (en) * 2008-09-17 2010-04-02 Seiko Instruments Inc Image storage device
WO2010044146A1 (en) * 2008-10-15 2010-04-22 三菱電機株式会社 Encryption device and decoding device, and encryption method and decoding method
WO2011151982A1 (en) * 2010-06-01 2011-12-08 三菱電機株式会社 Media encryption device, media encryption and decryption device, method of media encryption, and method of media encryption and decryption
JP2012044355A (en) * 2010-08-17 2012-03-01 Renesas Electronics Corp Data processor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006345491A (en) * 2005-05-09 2006-12-21 Nikon Corp Imaging apparatus and drive recorder system
JP2008140334A (en) * 2006-12-05 2008-06-19 Asahi Research Kk Photographed image recording and reproducing device
JP2010074339A (en) * 2008-09-17 2010-04-02 Seiko Instruments Inc Image storage device
WO2010044146A1 (en) * 2008-10-15 2010-04-22 三菱電機株式会社 Encryption device and decoding device, and encryption method and decoding method
WO2011151982A1 (en) * 2010-06-01 2011-12-08 三菱電機株式会社 Media encryption device, media encryption and decryption device, method of media encryption, and method of media encryption and decryption
JP2012044355A (en) * 2010-08-17 2012-03-01 Renesas Electronics Corp Data processor

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