JP2008245070A - Image data recording system, drive recorder and image data tampering judgment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image data recording system, drive recorder and image data tampering judgment method which can verify whether recorded image data are right data or not and are excellent in convenience. <P>SOLUTION: The data recording system 1 for recording image data of an image photographed by an imaging section 70, includes: a collation information generating section 10 for generating collation information for judging whether the image data are tampered or not, based on image data of a recording format generated based on the image captured by the imaging section 70; and a data recording processing section 20 which performs processing for storing the image data of the recording format into a first nonvolatile memory 40 and storing the collation information corresponding to the relevant image data separately from the first nonvolatile memory. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image data recording system, a drive recorder, and an image data alteration determination method.

  In order to acquire image data at the time of an accident of a moving body such as a car, a drive recorder mounted on the moving body is known.

As a drive recorder technique, a plurality of image data acquired in time series by an imaging unit is sequentially stored in a primary storage unit, and when an accident is detected, it is acquired during a predetermined period before the accident. A technique for storing image data stored in a primary storage unit in a secondary storage unit (nonvolatile external storage medium) is known. According to this, since the image data acquired in the predetermined period before the accident can be stored in the secondary storage unit, the progress of the accident can be clarified.
Japanese Patent Laid-Open No. 10-250642

  When image data recorded by a drive recorder is used to investigate the cause of an accident, the credibility of the data becomes important. However, the current drive recorder has a problem that the data recorded on the external recording medium can be easily falsified, there is no means for confirming that the data has been falsified, and it cannot be determined whether the data is correct.

  For example, in the above-mentioned document, a fuse that is cut in response to an acceleration sensor is provided in a write signal of a flash memory that records information so that tampering cannot be performed without the knowledge of a third party. However, even if the acceleration sensor malfunctions or an accident determination error occurs, the fuse is blown, and writing to the memory cannot be performed, which is inconvenient.

  An object of the present invention is to provide a convenient image data recording system, a drive recorder, and an image data alteration determination method that can verify whether recorded image data is correct data.

(1) The present invention
A data recording system for recording image data of an image captured by an imaging unit,
A collation information generating unit that generates collation information for determining whether the image data has been falsified based on image data in a recording format generated based on an image acquired by the imaging unit;
A data recording processing unit for storing the image data in the recording format in a first nonvolatile memory and performing processing for storing collation information corresponding to the image data separately from the first nonvolatile memory; ,
It is characterized by including.

  The first non-volatile memory may be a non-volatile memory that is rewritable and does not lose data even when the power is turned off, and may be a flash EEPROM or flash ROM, or a CF (CompactFlash) card or a memory stick. Good.

  The image data and the collation information may be generated corresponding to one-to-one, or may be generated for a part of the image data (for example, every other one) (generated for many-to-one correspondence). ) Configuration is also acceptable.

  The image data and the generated collation information are temporarily stored in the primary storage memory and then stored in the first nonvolatile memory and another storage location at a predetermined timing. For example, the image data and the collation information may be stored in the first storage memory. A configuration in which data is stored in a rewritable nonvolatile memory in a FIFO format or a ring buffer format may be used.

  The collation information may be any information that can be uniquely associated with the image data. For example, the image data itself may be used as the collation information, or a unique value obtained by a predetermined algorithm based on the image data is used as the collation information. Also good. Here, the collation information is generated based on the image data in the recording format generated based on the image acquired by the imaging unit. The image data in the recording format is, for example, when resizing (cutting out an image) or compressing the image data acquired by the imaging unit and storing it in the first non-volatile memory, after the resizing or compressing Image data. When image data captured by the imaging unit is stored as it is in the first nonvolatile memory, the image data captured by the imaging unit becomes image data in a recording data format.

  Saving collation information separately from the first non-volatile memory may be configured to store the collation information in a medium (second non-volatile memory) physically different from the first non-volatile memory, for example. Alternatively, the verification information may be transmitted to the server device and stored in the server device. Here, the medium in which the collation information is stored is preferably a medium that cannot be easily accessed by the user (for example, a protected medium, a medium that cannot be taken out to the outside, or a medium managed by the server device). For example, the second nonvolatile memory is written in a non-detachable memory (for example, EEPROM) different from the first nonvolatile memory in which image data is recorded, and the memory 2 can be read only from a maintenance device. It is good.

  According to the present invention, recorded image data and collation information generated based on the recorded image data are recorded on different media. Therefore, it is possible to determine whether the image data is correct by generating unique information from the image data in question (image data of the first non-volatile memory) and comparing it with the unique information recorded by this system. Is possible. Accordingly, it is an object of the present invention to provide a convenient image data recording system capable of verifying whether recorded image data is correct data.

(2) The image data recording system of the present invention
An image data primary storage processing unit that stores image data acquired by the imaging unit and verification information generated by the verification information generation unit in a primary storage unit;
The data recording processing unit
The image data stored in the primary storage unit is stored in the first nonvolatile memory at a predetermined timing, and the unique information stored in the primary storage unit corresponding to the image data is stored in the second nonvolatile memory. It is characterized in that processing to be stored in a memory or processing to be transmitted to a server device is performed.

  The predetermined timing may be, for example, the timing at which the system detects the occurrence of an accident.

  The second non-volatile memory may be a non-volatile memory that is rewritable and does not lose data even when the power is turned off, and may be a flash EEPROM or flash ROM, or a CF (CompactFlash) card or a memory stick. It is preferable that the medium is different from the first nonvolatile memory. Moreover, it is preferable that it is a medium which cannot be attached or detached with respect to a main body.

  The verification information transmitted to the server device is stored in the server device. When transmitting to the server device, the device ID may be assigned and transmitted, and the server device may store the received verification information in association with the identification ID.

  In addition, the image stored in the first nonvolatile memory may be, for example, image data acquired during a predetermined period before and after the occurrence of the accident, or image data acquired during a predetermined period before the occurrence of the accident.

  According to the present invention, it is possible to always acquire imaging data and store the image data before and after the accident and the corresponding collation information in the nonvolatile memory at the timing of the occurrence of the accident.

(3) The image data recording system of the present invention
The verification information generation unit
As the verification information, unique information that can be uniquely derived based on the value of image data in a recording format is generated.

(4) The image data recording system of the present invention includes:
The verification information generation unit
As the verification information, CRC information is generated based on the value of image data in a recording format.

  The CRC information may be generated by generating one piece of CRC information for the entire recording format image data, or by dividing the recording format image into a plurality of parts and generating CRC information for each part. The unique information may be generated by a plurality of CRC information groups.

(5) The image data recording system of the present invention is
The verification information generation unit
Parity information is generated as the verification information based on the value of image data in a recording format.

  The parity information may have a configuration in which one parity bit is generated for the entire image data in the recording format, or a plurality of generated parity bits are generated by dividing the recording format image into a plurality of portions. The specific information may be generated with a group of parity bits.

(6) The image data recording system of the present invention includes:
A pressure processing unit that generates compressed image data by compressing image data acquired by the imaging unit;
The verification information generation unit
Based on the compressed image data, generate verification information,
The image data recording processing unit
Compressed image data is stored in a nonvolatile first nonvolatile memory, and collation information generated based on the compressed image data stored in the first nonvolatile memory is stored separately from the first nonvolatile memory. The processing for this is performed.

(7) The image data recording system of the present invention includes:
Including an identification information addition processing unit for adding identification information capable of associating image data and verification information to the image data and verification information;
The image data recording processing unit
The image data after the identification information is added is stored in a nonvolatile first nonvolatile memory, and the verification information after the identification information is added is stored separately from the first nonvolatile memory. .

  Association information is attached to image information and collation information, and time information and serial no are attached to each image.

(8) The image data recording system of the present invention includes:
The verification information generation unit
It is characterized in that frames are thinned out at a predetermined rate from an image group of a plurality of frames acquired by the imaging unit, and image data in a recording format corresponding to the remaining frames is used as collation information.

(9) The image data recording system of the present invention includes:
The verification information generation unit
The unique information corresponding to the image data of the thinned frame is generated based on the image data in the recording format of the thinned frame.

(10) The image data recording system of the present invention includes:
The verification information generation unit
The image data of a plurality of frames acquired by the imaging unit is extracted for each frame and image data in different areas of the image data in the recording format is generated to generate collation information.

(11) The present invention
An image data recording system according to any of the above,
An imaging unit;
A first non-volatile memory;
A second nonvolatile memory of a non-removable medium different from the first nonvolatile memory;
A drive recorder including an impact detector;
The data recording processing unit
The occurrence of an accident event is determined based on the detection result of the impact detection unit, and the image data stored in the primary storage unit is stored in the first nonvolatile memory at the occurrence timing of the accident event, and the image data is supported. The verification information is stored in the first nonvolatile memory.

  The imaging unit may be a CCD camera, for example. The first nonvolatile memory is a rewritable nonvolatile memory such as a CF card or a memory stick. The second nonvolatile memory is a rewritable nonvolatile memory such as an EEPROM. The impact detection unit can be realized by a sensor that can detect an impact caused by an accident, such as an acceleration sensor or a gyro sensor.

  According to the present invention, it is possible to provide a convenient drive recorder that can verify whether image data recorded in an accident is correct data (whether it has been tampered with).

(12) The present invention
A method for determining falsification of image data recorded in any of the image data recording systems described above,
Generating unique information based on the image data in question;
Reading the unique information corresponding to the image data in question from the second nonvolatile memory;
Comparing the unique information generated based on the image data in question with the unique information read from the second nonvolatile memory to determine whether the image data has been tampered with;
It is characterized by including.

  Embodiments to which the present invention is applied will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments. The semiconductor device according to the present invention includes any combination of the following embodiments and modifications.

  Hereinafter, an image data recording system to which the present invention is applied will be described.

  FIG. 1 is a functional block diagram of the image data recording system 1 and the drive recorder of the present embodiment. The image data recording system 1 of this embodiment is a data recording system that records image data of an image captured by the imaging unit 70. The image data recording system 1 of the present embodiment uses collation information for generating collation information for determining whether or not the image data has been falsified based on image data in a recording format generated based on an image acquired by the imaging unit 70. The generation unit 10 and a process for storing the image data in the recording format in the first nonvolatile memory 40 and storing collation information corresponding to the image data separately from the first nonvolatile memory. And a data recording processing unit 20 to be performed.

  Also included is an image data primary storage processing unit 32 that stores the image data acquired by the imaging unit 70 and the verification information generated by the verification information generation unit in the primary storage unit 32.

  The data recording processing unit 20 stores the image data stored in the primary storage unit 32 in the first nonvolatile memory 40 at a predetermined timing, and is stored in the primary storage unit 32 corresponding to the image data. The unique information stored in the second nonvolatile memory 50 may be stored or transmitted to the server device.

  Further, the collation information generation unit 10 may generate unique information that can be uniquely derived as the collation information based on the value of the image data in the recording format.

  Further, the collation information generation unit 10 may generate CRC information as the collation information based on the value of the image data in the recording format.

  Further, the verification information generation unit 10 may generate parity information as the verification information based on the value of the image data in the recording format.

  The image processing unit 70 further includes a pressure processing unit 62 that compresses the image data acquired by the imaging unit 70 to generate compressed image data. The verification information generation unit 10 generates verification information based on the compressed image data, and performs image data recording processing. The unit 20 stores the compressed image data in the non-volatile first non-volatile memory 40, and the collation information generated based on the compressed image data stored in the first non-volatile memory 40 is stored in the first non-volatile memory. Processing for storing separately from the memory 40 may be performed.

  Identification information addition processing units 90 and 92 for adding identification information capable of associating image data and verification information to the image data and verification information, and the image data recording processing unit 20 stores the image data after adding the identification information in a nonvolatile manner. May be stored in the first non-volatile memory 40 and processing for storing the verification information after adding the identification information separately from the first non-volatile memory may be performed.

  The verification information generation unit 10 thins out frames at a predetermined rate from the image group of the plurality of frames acquired by the imaging unit 70, and uses the recording format image data corresponding to the remaining frames as the verification information. Good.

  The collation information generation unit 10 may generate unique information corresponding to the image data of the thinned frame based on the image data in the recording format of the thinned frame.

  Further, the collation information generation unit 10 generates collation information by extracting image data of different areas of the image data in the recording format for each frame from the image group of the plurality of frames acquired by the imaging unit 70. Also good.

  The drive recorder 190 of the present embodiment includes a second non-removable medium that is different from the image data recording system 1, the imaging unit 70, the first nonvolatile memory 40, and the first nonvolatile memory 40. The data recording processing unit 20 includes a nonvolatile memory 50 and an impact detection unit 80. The data recording processing unit 20 determines the occurrence of an accident event based on the detection result of the impact detection unit 80, and stores it in the primary storage unit at the occurrence timing of the accident event. The stored image data may be stored in the first nonvolatile memory, and collation information corresponding to the image data may be stored in the first nonvolatile memory.

  FIG. 2 is a hardware block diagram of the image data recording system 1 and the drive recorder 190 of the present embodiment.

  The image data recording system 1 may be configured as a system (for example, a drive recorder system mounted on a car) 190 mounted on a moving body such as a car.

  The drive recorder 190 according to the present embodiment includes an image data recording processing integrated circuit device (IC) 100, which is an image data recording system 1 in a narrow sense, a camera module 70 connected to the image data recording processing IC 100, and an impact sensor. 80 and a CF card (first non-volatile memory) 40.

  The image data recording processing IC 100 includes a CPU 110, an image processing circuit 60, a camera I / F 72, a DMAC (Direct Memory Access Controller) 120, a sensor I / F 120, an SDRAM 30, a memory I / F 140, an EEPROM 50, a ROM 160, and a RAM 150. When generating CRC information as unique information, a CRC information generation circuit (dedicated hardware) 170 may be included. Further, when the unique information is transmitted to an external server device, the communication unit 130 may be included.

  The CPU 110 performs various processes for recording image data in accordance with a control program stored in the ROM 140. Based on the image data acquired by the camera module, the CPU 110 generates collation information for determining whether the image data has been tampered with. Functions as a collation information generation unit. In addition, the image data and the collation information stored in the SDRAM (primary storage unit) are stored at a given timing in the CF card or EEPRPM (other storage medium) or transmitted to the server in the communication unit 130. It functions as a data recording processing unit that performs processing to command. Also, it functions as an identification information addition processing unit that adds identification information capable of associating image data and verification information to image data and verification information.

  The CPU 110 and the DMAC 120 cooperate to function as an image data primary storage processing unit that stores the image data acquired by the camera module 70 and the generated collation information in the SDRAM (primary storage unit). Here, the image data acquired by the camera module 70 may be configured such that, for example, the CPU 110 directly transfers to the SDRAM (primary storage unit), or the CPU 110 instructs the DMAC 120 to transfer the DMAC 120 to the SDRAM (primary storage unit). Good. For example, when the CPU generates unique information such as CRC information by software, the CPU may transfer the generated unique information to an SDRAM (primary storage unit). When the unique information is generated by the CRC information generation circuit (dedicated hardware) 170, the DMAC 120 transfers the image data output from the image processing circuit to the CRC information generation circuit (dedicated hardware) 170 to generate CRC information. The circuit (dedicated hardware) 170 may be configured to transfer the generated CRC information (unique information) to the SDRAM (primary storage unit).

  The camera I / F 72 is connected to the camera module 70 and performs processing for receiving image data of an image captured by the camera module. The image processing circuit 60 performs image processing such as resizing (cutting) and JPEG compression on the image data received from the camera I / F 72 to generate image data in a recording format, and includes a JPEG encoder 62 and the like. . The EEPROM 50 is a rewritable nonvolatile memory and functions as a second nonvolatile memory.

  The communication unit 130 transmits collation information to the server device, and its function can be realized by various processors, hardware such as a communication ASIC, or a given program.

  The camera module 70 is output from a light receiving element that converts incident light into an electrical signal, an optical system that makes light incident on the light receiving element (for example, an optical system configured by an optical element such as a lens or a mirror), and the light receiving element. For example, it may be realized by a CCD camera or the like. The camera module 70 may be mounted on a moving body such as a car and configured to acquire a plurality of image data in time series. For example, the image data may be acquired at a rate of 30 frames per second.

  The impact sensor 80 is a sensor for detecting an accident such as a collision, and can be realized by, for example, an acceleration sensor or a gyro sensor, but can also be realized by another sensor that can detect an impact of an accident. It is.

  A CF (CompactFlash) card is a rewritable nonvolatile memory and functions as a first nonvolatile memory. Note that the memory card is not limited to a CF (CompactFlash) card, and may be a memory stick, for example.

  In the above embodiment, the configuration in which the EEPROM which is the second nonvolatile memory is in the IC has been described as an example. However, the CF card (the first nonvolatile memory and the second nonvolatile memory) is the external memory. May be realized by another CF card) or a memory stick. The unique information may be transmitted to the server device or the like via the communication unit 130.

  FIG. 3 is a diagram for explaining the data recording process of the present embodiment.

  In the present embodiment, the image data acquired in time series by the camera module is sequentially compressed, and the compressed image data 200-nk,..., 200-n-2, 200-n-1, 200- n is sequentially stored in the primary storage unit 30. Further, the unique information 210-nk,..., 210-n- generated corresponding to the compressed image data 200-nk,..., 200-n-2, 200-n-1, 200-n. 2, 210-n-1, 210-n-2 are also sequentially stored in the primary storage unit 30. The primary storage unit 30 can be configured by SDRAM or the like, and may be configured as a first-in first-out FIFO, sequentially writing from the beginning to the end of the data area, and sequentially writing from the beginning to the end again when reaching the end. You may comprise as a ring buffer which performs cyclic write control.

  In the present embodiment, the image data stored in the primary storage unit 30 is stored in the first nonvolatile memory 40 at a given timing, and corresponds to the image data stored in the first nonvolatile memory 40. The unique information is stored in the second nonvolatile memory 50.

  Here, the given timing is a timing at which an impact event such as an accident has occurred is detected. For example, it may be determined whether or not a detection value of an impact sensor or the like satisfies a predetermined condition, and it may be determined that an impact event has occurred when the predetermined condition is satisfied.

  Then, the first nonvolatile memory 40 and the second nonvolatile memory respectively store the image data and the unique information corresponding to the image data acquired within a predetermined period before and after the occurrence of the impact event, or within a predetermined period before the occurrence of the impact event. Stored in the memory 50.

  For example, when an impact event occurs at 230, image data 200-nk,..., 200-n-2, 200-n-1, acquired during a predetermined period 240 including the impact event, as shown in FIG. 200-n is stored in the first nonvolatile memory 40, and the unique information 210-nk, ..., 210-n-2, 210-n-1, 210-n-2 corresponding to the image data is It is stored in the second nonvolatile memory 50.

  FIG. 4 is a diagram for explaining the unique information of the present embodiment.

  The unique information is one type of collation information, and unique information that can be uniquely derived based on the value of the image data in the recording format is generated.

  For example, when the compressed image data is stored in the first nonvolatile memory, the image data in the recording format means the image data in the compressed format, and the image data is not compressed and is stored in the first nonvolatile memory. When stored in the volatile memory, it means image data in an uncompressed format.

  Here, an example in which parity information is generated based on the value of image data in a recording format will be described. For example, when the compressed image data is compressed image data divided into n blocks, the values (binary numbers) 310-1, 310-2,. An n-bit value composed of a set of the obtained parity bits 1 bit 320-1, 320-2,... 320-n may be generated as specific information. In addition, although FIG. 4 demonstrated the case where the even parity was calculated | required, you may obtain | require odd parity.

  In the above embodiment, the case where the parity bit is obtained for each block of the image data compressed as the unique information has been described as an example, but the present invention is not limited to this. For example, a parity bit may be obtained for each line of compressed image data.

  Further, the present invention is not limited to parity bits. For example, CRC information of compressed image data may be obtained and used as unique information, or a uniquely derivable value may be obtained and used as unique information according to another predetermined algorithm or function or conversion table.

  FIGS. 5A and 5B are diagrams for explaining the addition of identification information that can associate image data with verification information.

  For example, the unique information 1 is generated based on the image data 1, the unique information 2 is generated based on the image data 2,..., The unique information n is generated based on the image data n. In such a case, identification information that can be associated is added to the unique information n corresponding to the image data n. The additional information added to the image data and the additional information added to the unique information may be the same value, or may be values that can be associated with one body 1 although the values themselves are different.

  For example, as shown in FIG. 5A, serial numbers added to the image data 200-1, 200-2,..., 200-n are added to image information headers 202-1, 202-2,. 202-n and may be added as headers 212-1, 212-2,..., 212-n of the corresponding unique information 210-1, 210-2,. . Here, for example, a counter that counts every time an image is acquired (the counter value is reset at a predetermined time every day) may be provided, and the counter value may be added as a serial number to the image data and unique information as a header. .

  Further, as shown in FIG. 5B, the acquisition time (hhssmmnn) of the image data may be added as identification information to the header of the image data and the corresponding unique information.

  FIG. 6 is a diagram for explaining an example in which image data itself is stored as collation information.

  Image data of odd frames with respect to image data 200-1 (first frame), 200-2 (second frame), 200-3 (third frame),. 200-1 (first frame), 200-3 (third frame),... May be stored as collation information. That is, the image data corresponding to the remaining frames may be retained as the collation information by thinning out the odd-numbered frame image data. It should be noted that the thinning ratio may be a configuration in which one sheet is thinned out for two sheets, a structure in which two sheets are thinned out for three sheets, or a structure in which n-1 sheets are thinned out to n sheets. In this manner, frames are thinned out at a predetermined rate from a plurality of frames of image groups that may be stored in the first non-volatile memory, and image data corresponding to the remaining frames is held as collation information. Also good.

  FIG. 7 is a diagram for explaining a configuration in which image data and unique information are mixed and provided as collation information.

  Image data of odd frames with respect to image data 200-1 (first frame), 200-2 (second frame), 200-3 (third frame),. 200-1 (first frame), 200-3 (third frame),... Are stored as collation information. And, for the even frame image data 200-2 (second frame),..., 200-2n (2n frame), specific information 210-2,. You may make it hold | maintain.

  FIG. 8 is a diagram illustrating an example in which part of image data is stored as collation information.

  Reference numerals 400-1, 400-2, 400-3, and 400-4 are image data in the recording format of the first frame, the second frame, the third frame, and the fourth frame, respectively, acquired by the camera module in time series. , 410-1, 410-2, 410-3, 410-4 indicate areas to be extracted as collation information for the first frame, second frame, third frame, and fourth frame image data, respectively. . As described above, for a plurality of frame image groups stored in the first nonvolatile memory, image data of different areas may be extracted for each frame and held as collation information.

  Here, when the compressed image data is stored in the first non-volatile memory, image data in a different area (for example, a different block after compression) may be extracted from the compressed image data. Alternatively, different areas of the image data before compression may be cut out, and the collation information may be generated by compressing the image data of the cut out area.

  FIG. 9 is a flowchart for explaining an example of the flow of the image data recording process of the present embodiment. Here, a case where image data is recorded in the first nonvolatile memory and unique information is stored in the second nonvolatile memory will be described as an example.

  First, image data of a photographed image is captured (step S10).

  Next, the captured image data is compressed (step S20).

  Next, unique information is calculated for the compressed image data (step S30).

  Next, the image data and the unique information are written in SDRAM (volatile memory) (step S40).

  Then, the processes in steps S10 to S40 are repeated until an impact event is detected. When an impact event is detected, the following process is performed.

Image data for a predetermined period before and after the detection of the impact event is written to the CF card (first nonvolatile memory) (step S60).
Next, the unique information corresponding to the image data for a predetermined period before and after the detection of the impact event is written in the EEPROM (first nonvolatile memory) (step S70).
Then, after a predetermined period has elapsed, writing of image data and unique information to the SDRAM (volatile memory) is stopped (step S80).

  FIG. 10 is a flowchart for explaining another example of the flow of the image data recording process of the present embodiment. Here, a case where image data is recorded in the first nonvolatile memory and unique information is transmitted to the server will be described as an example.

  First, image data of a photographed image is captured (step S110).

  Next, the captured image data is compressed (step S120).

  Next, unique information is calculated for the compressed image data (step S130).

  Next, the image data and the unique information are written in SDRAM (volatile memory) (step S140).

  Then, the processes in steps S110 to S140 are repeated until an impact event is detected. When an impact event is detected, the following process is performed.

Image data for a predetermined period before and after the detection of the impact event is written to the CF card (first nonvolatile memory) (step S160).
Next, the unique information corresponding to the image data of a predetermined period before and after the detection of the impact event is transmitted to the server together with the identification ID of the own device (step S170). On the server side, the received unique information is stored in the nonvolatile memory together with the received identification ID (identification ID of the image data recording system of the transmission source).

  After a predetermined period, writing of image data and unique information to the SDRAM (volatile memory) is stopped (step S180).

  FIG. 11 is a flowchart of the image data alteration technique of the present embodiment.

  First, unique information is generated based on the image data in question (step S210).

  Next, the unique information corresponding to the image data in question is read from the second nonvolatile memory (step S220).

  Next, the unique information generated based on the image data in question is compared with the unique information read from the second nonvolatile memory (step S230).

  If the comparison results match, it is determined to be correct (steps S240 and S250), and if they do not match, it is determined that there is a possibility of falsification (steps S240 and S260).

  The present invention is not limited to the above-described embodiment, and various modifications can be made. The present invention includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations that have the same functions, methods, and results, or configurations that have the same objects and effects). In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. Further, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

1 is a functional block diagram of an image data recording system and a drive recorder of the present embodiment. 1 is a hardware block diagram of an image data recording system and a drive recorder of the present embodiment. The figure for demonstrating the data recording process of this Embodiment. The figure for demonstrating the specific information of this Embodiment. The figure for demonstrating addition of the identification information which can match | combine image data and collation information. The figure for demonstrating the example which memorize | stores image data itself as collation information. The figure explaining the structure which mixes and has image data and intrinsic | native information as collation information. The figure explaining the example which memorize | stores a part of image data as collation information. 6 is a flowchart for explaining an example of a flow of image data recording processing according to the present embodiment. 10 is a flowchart for explaining another example of the flow of image data recording processing according to the present embodiment. The flowchart of the image data alteration technique of this Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Image data recording system, 10 Collation information generation part, 20 Data recording process part, 30 Image data primary storage process part, 32 Primary storage part (SDRAM), 40 1st non-volatile memory (CF card), 50 2nd Non-volatile memory (EEPROM), 60 image processing circuit, 62 JPEG encoder, 70 imaging unit (camera module), 72 camera I / F, 80 impact detection unit, 82 sensor I / F, 90, 92 identification information addition processing unit, 100 IC, 110 CPU, 120 DMAC, 130 communication unit, 140 memory I / F, 150 RAM, 160 ROM, 170 CRC generation circuit, 190 drive recorder

Claims (12)

A data recording system for recording image data of an image captured by an imaging unit,
A collation information generating unit that generates collation information for determining whether the image data has been falsified based on image data in a recording format generated based on an image acquired by the imaging unit;
A data recording processing unit for storing the image data in the recording format in a first nonvolatile memory and performing processing for storing collation information corresponding to the image data separately from the first nonvolatile memory; ,
An image data recording system characterized by including In claim 1,
An image data primary storage processing unit that stores image data acquired by the imaging unit and verification information generated by the verification information generation unit in a primary storage unit;
The data recording processing unit
The image data stored in the primary storage unit is stored in the first nonvolatile memory at a predetermined timing, and the unique information stored in the primary storage unit corresponding to the image data is stored in the second nonvolatile memory. An image data recording system which performs processing to be stored in a memory or processing to be transmitted to a server device. In any one of Claims 1-2.
The verification information generation unit
An image data recording system that generates unique information that can be uniquely derived based on the value of image data in a recording format as the verification information. In any one of Claims 1 thru | or 3,
The verification information generation unit
CRC data is generated as the collation information based on the value of image data in a recording format. In any one of Claims 1 thru | or 4,
The verification information generation unit
Parity information is generated based on the value of image data in a recording format as the collation information. In any one of Claims 1 thru | or 5,
A pressure processing unit that generates compressed image data by compressing the image data acquired by the imaging unit;
The verification information generation unit
Based on the compressed image data, generate verification information,
The image data recording processing unit
The compressed image data is stored in the first nonvolatile nonvolatile memory, and collation information generated based on the compressed image data stored in the first nonvolatile memory is stored separately from the first nonvolatile memory. An image data recording system characterized by performing processing for the purpose. In any one of Claims 1 thru | or 6.
An identification information addition processing unit for adding identification information capable of associating image data and verification information to the image data and verification information;
The image data recording processing unit
Image data after adding identification information is stored in a non-volatile first non-volatile memory, and processing for storing verification information after adding identification information separately from the first non-volatile memory is performed. Image data recording system. In any one of Claims 1 thru | or 7,
The verification information generation unit
An image data recording system, wherein frames are thinned out at a predetermined rate from an image group of a plurality of frames acquired by an imaging unit, and image data in a recording format corresponding to the remaining frames is used as collation information. In claim 8,
The verification information generation unit
An image data recording system that generates unique information corresponding to image data of a thinned frame based on image data in a recording format of the thinned frame. In any one of Claims 1 thru | or 9,
The verification information generation unit
An image data recording system for generating collation information by extracting image data of different areas of image data in a recording format for each frame from an image group of a plurality of frames acquired by an imaging unit. An image data recording system according to any one of claims 2 to 10,
An imaging unit;
A first non-volatile memory;
A second nonvolatile memory of a non-removable medium different from the first nonvolatile memory;
A drive recorder including an impact detector;
The data recording processing unit
The occurrence of an accident event is determined based on the detection result of the impact detection unit, and the image data stored in the primary storage unit is stored in the first nonvolatile memory at the occurrence timing of the accident event, and the image data is supported. A drive recorder that stores verification information in a first nonvolatile memory. A method for determining falsification of image data recorded in the image data recording system according to any one of claims 1 to 10,
Generating unique information based on the image data in question;
Reading the unique information corresponding to the image data in question from the second nonvolatile memory;
Comparing the unique information generated based on the image data in question with the unique information read from the second nonvolatile memory to determine whether the image data has been tampered with;
A method for determining whether or not image data has been tampered with.

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