JP2006127641A - Data recording apparatus and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily realizable data recording apparatus capable of ensuring the security even when a storage means is extracted externally and reducing a processing time of data recording. <P>SOLUTION: An imaging section 14 generates image data being recording object data. A main control section 12 functions as a write processing section and carries out processing of writing the image data to a memory card 18 and an internal storage device 20. The memory card 18 and the internal storage device 20 are first and second storage means. The image data are recorded in a format of file data including management data and real data of a file system. Then the write processing is carried out so that the file data are divided and distributed to the memory card 18 and the internal storage device 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a data recording apparatus provided with storage means that can be taken out from the outside. The data recording device is provided in an imaging device such as a surveillance camera.

  2. Description of the Related Art Conventionally, various electronic devices are provided with a data recording device that writes data to a removable storage means. For example, a memory card-equipped monitoring camera that can record image data on a removable memory card is known. For example, this type of surveillance camera records an alarm image on a memory card. The alarm image is an image taken when an alarm occurs, and the occurrence of the alarm is detected by a detector such as a door, for example. In addition, when a cable for sending a monitoring image is disconnected, the image may be recorded on the memory card.

  Such a security camera prevents unauthorized viewing and use of image data in the memory card even if the memory card is removed from the camera by a third party other than a legitimate administrator from the viewpoint of security. It is required to do.

A technique for preventing unauthorized browsing of image data in a memory card is described in Patent Document 1, for example. This document adopts a public key cryptosystem. The image data is encrypted using the public key and then stored on the memory card. When outputting the image data of the memory card, the image data is decrypted using a secret key paired with the public key.
Japanese Patent Laying-Open No. 2002-91744 (10th page, FIG. 3)

  However, the conventional data recording apparatus performs encryption and decryption using a public key, and the processing time in software for encryption and decryption is long. For this reason, there is a problem that it is not suitable when high-speed writing is required, such as recording of an alarm image in a surveillance camera.

  In the prior art, dedicated hardware for encryption and decryption is required. In order to view image data, even an administrator needs a dedicated output device for decryption, and further requires management and delivery of keys. As described above, the conventional apparatus requires hardware for cryptographic processing, and thus has a problem that it is not easy to realize.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a data recording apparatus that can ensure security and can be easily realized with a short processing time.

  The data recording apparatus of the present invention performs a process of writing data to a data acquisition unit that acquires data to be recorded, a first storage unit that can be taken out from the outside, and a second storage unit that is different from the first storage unit. A write processing unit, wherein the write processing unit divides the file data into a file data format including file system management data and actual data, and the first storage means And it is comprised so that the process written in the said 1st memory | storage means and the said 2nd memory | storage means may be performed so that it may be in the state allocated to the said 2nd memory | storage means.

  With this configuration, since the file data is distributed to the first storage means and the second storage means, even if a third party takes out only the first storage means, the data cannot be viewed. As described above, since illegal browsing is prevented by distributing data to a plurality of storage means, the configuration for preventing browsing is simple and the processing time is short. Therefore, it is possible to provide a data recording apparatus that can ensure security and can be easily realized with a short processing time.

  In the data recording apparatus of the present invention, the data acquisition unit acquires image data as the recording target data. The image data is, for example, an image of a surveillance camera. With this configuration, even when high-speed writing is required, such as image recording by a monitoring camera, data can be recorded in a state where the third party cannot use it.

  In the data recording apparatus of the present invention, the write processing unit performs a process of writing data to a memory medium that is the first storage unit and an internal storage device that is the second storage unit. With this configuration, illegal browsing of data in the memory medium can be effectively prevented using the internal storage device.

  The data recording apparatus of the present invention includes an extraction request reception unit that receives an extraction request from the first storage unit, and when the extraction request is received, the data in the second storage unit is stored in the first storage unit. And a coalescing processing unit that merges the divided file data. With this configuration, when the first storage means is taken out by a legitimate user, the file data is merged in the first storage means, so that data can be viewed using a personal computer or the like, and a dedicated viewer or the like is not required. . Therefore, it is possible to provide a data recording apparatus that can be easily used by the user.

  Further, the data recording apparatus of the present invention refers to the output request accepting means for accepting the output request for the data to be recorded, and when the output request is accepted, referring to the first storage means and the second storage means, And a reading processor that reads the actual data according to the management data. With this configuration, for example, when data output is requested by a legitimate user, the recording target data is read with reference to the first storage unit and the second storage unit and output. Therefore, it is possible to provide a data recording apparatus that can be easily used by the user.

  In the data recording apparatus of the present invention, the write processing unit writes the actual data to the first storage unit and writes the management data to the second storage unit. With this configuration, since management data is not written to the first storage means, the actual data cannot be read from the first storage means. Therefore, unauthorized browsing and unauthorized use can be effectively prevented and security can be ensured. .

  In the data recording apparatus of the present invention, the write processing unit writes a part of the actual data in the second storage means. With this configuration, part of the actual data is not written to the first storage unit but is held by the second storage unit, so that the security can be further improved.

  In the data recording device of the present invention, the write processing unit forcibly changes the arrangement of the plurality of fragment data constituting the actual data in the file system from the original arrangement. With this configuration, a plurality of fragment data of the actual data is forcibly changed from the original order, and the actual data is forcibly written in a fragmented manner. Even when real data is recorded for the first time, the arrangement of fragment data is forcibly changed. Therefore, it becomes more difficult to restore data from only actual data, and security can be further improved.

  In the data recording apparatus of the present invention, the write processing unit writes false management data different from the management data corresponding to the actual data in the management data storage area of the first storage means. With this configuration, since the false management data is written in the first storage unit, it becomes more difficult to read the actual data from the first storage unit, and the security can be further improved.

  In the data recording apparatus of the present invention, the write processing unit divides the actual data and the management data, respectively, and distributes the divided data to the first storage unit and the second storage unit. With this configuration, the data to be recorded cannot be read from the first storage means, so security can be ensured.

  The data recording apparatus of the present invention further includes management data conversion means for converting the management data based on information unique to the apparatus. With this configuration, management data is recorded in a converted state, so that security can be improved. The device-specific information is, for example, a device number.

  According to another aspect of the present invention, there is provided a data recording apparatus comprising: a data acquisition unit that acquires data to be recorded; and a write processing unit that performs a process of writing data in a storage unit that can be taken out from the outside. The unit performs processing for writing the recording target data in the storage unit in a format of file data including management data and actual data of a file system in a state where the management data is converted based on information unique to the device. Configured to do. In this aspect, the entire file data may be written in a removable storage means. However, since the above-described conversion process is performed on the management data, security can be ensured. Moreover, such conversion processing is short in processing time and easy to implement.

  According to another aspect of the present invention, there is provided a data recording method for causing a computer to record data to be recorded. The method includes a first storage means that can be taken out from the outside, and a second storage means separate from the first storage means. A process of writing data to the recording target data, wherein the file data is divided into file data including file system management data and actual data, and the first storage means and the second storage A process of writing to the first storage means and the second storage means is performed so as to be assigned to the means. This configuration also provides the above-described advantages of the present invention.

  According to another aspect of the present invention, there is provided a data recording program for causing a computer to execute processing for recording data to be recorded. This program is a first storage means that can be taken out from the outside and a first storage means that is separate from the first storage means. A process of writing data to two storage means, wherein the recording target data is divided into the file data format including file system management data and actual data, and the file data is divided into the first storage means and The computer is configured to execute a process of writing to the first storage unit and the second storage unit so as to be assigned to the second storage unit. This configuration also provides the above-described advantages of the present invention.

  Another aspect of the present invention is an imaging apparatus, which includes an imaging unit that generates image data, a first storage unit that can be taken out from the outside, and a second storage unit that is separate from the first storage unit. A write processing unit that performs a process of writing data to the file, and the write processing unit divides the image data into a file data format including file system management data and actual data. Then, a process of writing in the first storage means and the second storage means is performed so that the state is distributed to the first storage means and the second storage means. With this configuration, the above-described advantages of the present invention can be obtained in the imaging apparatus.

  As described above, according to the present invention, by providing the write processing unit that distributes the file data between the first storage unit and the second storage unit, security can be ensured, the processing time is short, and can be easily realized. A data recording apparatus having an effect can be provided.

  Hereinafter, a data recording apparatus according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the data recording device is provided in a monitoring camera device that is one form of the imaging device.

  A surveillance camera device according to a first embodiment of the present invention is shown in FIG. In the monitoring camera device 10, the main control unit 12 is configured by a computer and controls the entire monitoring camera device 10. The imaging unit 14 includes a lens, an imaging element, and the like, generates image data, and supplies the image data to the main control unit 12. The image sensor is, for example, a CCD.

  The memory card interface unit 16 writes data to the memory card 18 connected to the monitoring camera device 10 and reads data from the memory card 18. The main control unit 12 controls the memory card interface unit 16 to write data to the memory card 18 and read data from the memory card 18. The memory card 18 includes a memory medium such as a flash memory, and has a storage capacity of about 64 Mbytes, for example. The memory card 18 can be taken out from the outside.

  The internal storage device 20 is a storage device built in the monitoring camera apparatus 10 and is configured by a nonvolatile memory such as an EEPROM or a flash memory. The main control unit 12 also performs processing for reading / writing data from / to the internal storage device 20.

  In the above, the imaging unit 14 corresponds to the data acquisition unit of the present invention, the main control unit 12 corresponds to the writing processing unit, and the memory card 18 and the internal storage device 20 correspond to the first storage unit and the second storage unit, respectively. It corresponds to the means. The main control unit 12 performs a process of writing the image data acquired by the imaging unit 14 to the memory card 18 and the internal storage device 20.

  In the monitoring camera device 10, the communication unit 22 has a function of communicating with the personal computer 26 via the LAN 24. The main control unit 12 controls the communication unit 22 to perform processing for outputting image data to the personal computer 26 by LAN communication.

  The monitoring camera device 10 further includes a display unit 28 and an operation unit 30, and the display unit 28 and the operation unit 30 are also controlled by the main control unit 12. The display unit 28 is a display and displays various information for guiding the operation of the monitoring camera device 10. The operation unit 30 includes switches, buttons, and the like. The operation unit 30 may be configured with a touch panel. Various user instructions are input using the operation unit 30.

  Next, a process in which the main control unit 12 writes image data to the memory card 18 and the internal storage device 20 will be described. As described below, the image data is divided and distributed to the memory card 18 and the internal storage device 20.

  Before describing the image data writing process, a data recording file system will be described. In this embodiment, a general-purpose file system is used.

  FIG. 2 schematically shows a file system 40 for recording data on the memory card 18. The file system 40 includes a management table 42 and a data area 44, which are recorded on a recording medium. The management table 42 includes file arrangement information 46 and a directory area 48.

  Actual data is recorded in the data area 44. Here, the actual data is image data. In the directory area 48, a table of head addresses of image data is recorded. The file arrangement information 46 is data arrangement information, and the arrangement information is information indicating how the image data of each file is arranged in the cluster group of the data area 44.

  In the above, the data in the management table 42 corresponds to the management data of the present invention. The amount of management data is significantly less than the actual data. Data including management data and actual data corresponds to the file data of the present invention.

  FIG. 3 shows the file system 40 in more detail by taking one image data as an example. In FIG. 3, the data area 44 is divided into a number of clusters. Assume that image data “image1.jpg” is recorded in clusters 1, 3, 6, and 7. At this time, the head address of “image1.jpg” is recorded in the directory area 48, thereby recording information indicating the cluster 1. Further, in the file arrangement information 46 table, information indicating the cluster 3 is recorded in the column of cluster 1. As a result, it is understood that the actual data of cluster 3 follows the actual data of cluster 1. Similarly, information indicating the cluster 6 is recorded in the column of cluster 3, information indicating the cluster 7 is recorded in the column of cluster 6, and information indicating the end is recorded in the column of cluster 7. From this management table, it can be seen that the actual data is recorded in clusters 1, 3, 6, and 7 and ends with cluster 7.

  Next, the image data writing process of the present embodiment will be described based on the configuration of the file system.

  FIG. 4 shows the writing process of the present embodiment. In the present embodiment, as shown in the figure, image file data is divided into actual data and a management table. The actual data is recorded on the memory card 18 and the management table is recorded on the internal storage device 20. Thereby, the file data is divided and distributed to the memory card 18 and the internal storage device 20. As a result, in the memory card 18, image data is written in the data area 44, but the management table is empty.

  The main control unit 12 controls the writing of data to the memory card 18 and the internal storage device 20 so that the writing state of FIG. 4 is obtained. It is sufficient that the state of FIG. 4 is finally obtained within the scope of the present invention. For example, the management table and actual data may be first recorded in the memory card 18 as usual, and then the management table may be moved to the internal storage device 20.

  Next, FIG. 5 shows processing when the memory card 18 is removed. In FIG. 5, as a result of the above-described writing process, before taking out the memory card 18, actual data is recorded in the memory card 18 and a management table is recorded in the internal storage device 20. The management table of the memory card 18 is empty.

  In FIG. 1, when the memory card 18 is removed, the main control unit 12 controls the display unit 28 to display an operation guide for the removal request. Then, the operation unit 30 is operated in accordance with the guidance, and information indicating an extraction request is sent to the main control unit 12, whereby the extraction request is received by the main control unit 12. In the operation of the extraction request, for example, a button for extraction is pressed. Further, when accepting an extraction request, an appropriate authentication process using a password or the like is preferably performed.

  Returning to FIG. 5, the main control unit 12 moves the management table of the internal storage device 20 to the memory card 18 when receiving the take-out request. Here, the main control unit 12 reads the management table from the internal storage device 20 and writes the read management table to the memory card 18. Thereby, the file data divided at the time of recording is merged on the memory card 18. After such a merge process, the memory card 18 is removed from the surveillance camera device 10. For example, the cover of the mounting portion of the memory card 18 is opened by a drive mechanism (not shown).

  In the above, the main control unit 12 functions as an extraction request accepting unit together with the operation unit 30, and also functions as a file data merge processing unit.

  Next, FIG. 6 shows processing when image data of the memory card 18 is output via the LAN. Again, as a result of the above-described writing process, before the output of the image data, the actual data is recorded on the memory card 18 and the management table is recorded on the internal storage device 20.

  In FIG. 1, the main control unit 12 controls the communication unit 22 and communicates with the personal computer 26 via the LAN 24. Through this communication, the main control unit 12 receives an output request for image data from the personal computer 26. In the communication here, an appropriate authentication process using a password or the like is suitably performed.

  When the main control unit 12 receives the output request, the main control unit 12 reconstructs the image data to be output with reference to the memory card 18 and the internal storage device 20, as shown in FIG. That is, the actual data of each file is read from the memory card 18 according to the information in the management table of the internal storage device 20. Then, the fragment data divided into a plurality of clusters are connected according to the management table. The image data obtained in this way is sent out using the communication unit 22.

  In the above description, the main control unit 12 functions as an output request accepting unit together with the communication unit 22, and also functions as a reading (reconstruction) processing unit for image data.

  Next, the operation of the monitoring camera device 10 of the present embodiment will be described. In the monitoring camera device 10, the imaging unit 14 generates monitoring image data and supplies it to the main control unit 12. In the present embodiment, moving image data is generated. The main control unit 12 controls the communication unit 22 to transmit normal image data to the personal computer 26 via the LAN 24.

  On the other hand, the main control unit 12 performs processing for recording the alarm image data in the memory card 18. The alarm image data is, for example, image data taken when an alarm is detected by a detector (not shown). The detector is, for example, a door open / close sensor. The main control unit 12 is connected to a detector, and records image data supplied from the imaging unit 14 in the memory card 18 when an alarm occurs in accordance with a signal from the detector.

  Then, when recording in the image data memory card 18, the main control unit 12 writes actual data into the memory card 18 and writes a management table into the internal storage device 20 as described with reference to FIG. 4. The management table is not written in the memory card 18. Or, once written, the management table is erased.

  The main control unit 12 performs processing for recording the image data on the memory card 18 even when communication using the communication unit 22 becomes impossible. Thereby, for example, when the communication cable is disconnected, the image data is recorded in the memory card 18. Even when communication is impossible, the main control unit 12 writes the actual data to the memory card 18 and writes the management table to the internal storage device 20 as shown in FIG.

  In the above writing process, key-type encryption is not performed, and the data is simply distributed to the two storage means, so that the processing time can be shortened. Therefore, the present embodiment can suitably perform the writing process even when the amount of data is large and high-speed writing is required as in the monitoring image recording process of the monitoring camera apparatus 10.

  When the administrator performs an operation for removing the memory card 18 on the operation unit 30 after recording the image data, the removal request is accepted by the main control unit 12 as described above. As shown in FIG. 5, the main control unit 12 performs a process of moving the management table of the internal storage device 20 to the memory card 18 when receiving the take-out request. Then, the main control unit 12 controls a mounting mechanism (not shown) so that the memory card 18 can be removed.

  The memory card 18 is taken out by an administrator, and is attached to, for example, a personal computer. The administrator browses the image data in the memory card 18 using a personal computer. Here, when the card is taken out, the management table is transferred from the internal storage device 20 to the memory card 18, whereby the file data divided at the time of recording is combined on the memory card 18. Therefore, a general personal computer can read image data from the memory card 18 according to the management table. There is no need for a dedicated viewer.

  Also, the data is not specially encrypted using a public key. Therefore, the administrator can browse the image data on the personal computer without preparing a secret key. In addition, since key-based decryption is not performed, an image can be reproduced in a short processing time.

  Further, it is assumed that an image data output request from the memory card 18 is received by communication from the personal computer 26 after the image data is recorded. In this case, the main control unit 12 reconstructs image data to be output with reference to the memory card 18 and the internal storage device 20, as shown in FIG. Here, the actual data is read from the memory card 18 in accordance with the management table of the internal storage device 20. The image data obtained in this way is sent out using the communication unit 22. Therefore, the administrator can view the image file data recorded in the divided state by the monitoring camera device 10 via the LAN 24.

  On the other hand, it is assumed that a person other than the administrator takes out the memory card 18 from the monitoring camera device 10. However, the management table is not written in the memory card 18 unless a predetermined operation is performed. For example, when the memory card 18 is taken out after the camera power is turned off, or when the memory card 18 is taken out after the surveillance camera device 10 is destroyed, the management table is not transferred to the memory card 18. The management table of the memory card 18 is empty. Without the management table, the image data in the data area 44 cannot be read. Thus, according to the present embodiment, unauthorized browsing and use can be prevented.

  The surveillance camera device 10 according to the first embodiment of the present invention has been described above. In the present embodiment, the memory card 18 and the internal storage device 20 correspond to the first storage means and the second storage means of the present invention. Then, the file data is distributed to the first storage means and the second storage means. In the present embodiment, the actual data of the file data is written to the first storage means, and the management data is written to the second storage means. Thereby, even if a third party takes out the 1st storage means, data cannot be browsed. Thus, in this embodiment, since browsing is prevented by distributing data to a plurality of storage means, the configuration for preventing browsing is simple and the processing time is short. Therefore, security can be ensured, processing time is short, and realization is easy.

  Further, in the monitoring camera device 10 of the present embodiment, when the first storage unit is taken out by a regular administrator, the file data is merged in the first storage unit. As described above, the administrator can browse data using a personal computer or the like, and a dedicated viewer or the like is not necessary. Therefore, the administrator can easily view the image data while ensuring security.

  In the surveillance camera device 10 of the present embodiment, when the output of image data is requested by a regular administrator, the actual data in the first storage means is read with reference to the management data in the second storage means. The read data is output. Therefore, the administrator can easily output data while ensuring security.

  In the present embodiment, the data recording device is provided in the monitoring camera device 10. The monitoring camera device 10 is a form of an imaging device. However, the data recording device may not be provided in the imaging device. Further, the recording target data is not limited to image data, and may be audio data, for example. Of course, both audio data and image data may be used.

  In the present embodiment, the first storage means is a memory card. However, the present invention is not limited to this. The first storage means may be any recording medium that can be taken out from the outside.

  In the present embodiment, the second storage means is an internal storage device. However, the present invention is not limited to this. Similarly to the first storage unit, the second storage unit may be a recording medium that can be taken out from the outside, and the second storage unit may also be a memory card. In this case, a memory card mounting unit and a memory card interface unit are added to the monitoring camera device 10.

  In the present embodiment, the first storage means and the second storage means are shown as one memory card 18 and one internal storage device 20, respectively. However, one or both of the first storage means and the second storage means may be composed of a plurality of storage media.

  In the present embodiment, the connection form between the monitoring camera device 10 and the outside is a network, and image data is output to the network. However, the present invention is not limited to this. The connection form with the outside may be an analog connection. In this case, an analog image signal is output.

  Next, a second embodiment of the present invention will be described. Also in this embodiment, the data recording device is provided in the surveillance camera device. And the surveillance camera apparatus of this Embodiment is equipped with the structure similar to 1st Embodiment shown by FIG. However, the present embodiment differs from the first embodiment in the processing related to image data recording. Hereinafter, descriptions of matters common to the first embodiment will be appropriately omitted.

  FIG. 7 shows image data writing processing of the present embodiment. As illustrated, in the present embodiment, the management table is stored in the internal storage device 20 as in the first embodiment. However, actual data is processed differently from the first embodiment.

  That is, in the first embodiment, all actual data is written in the memory card 18. On the other hand, in FIG. 7, part of the actual data is written to the internal storage device 20 and the rest is written to the memory card 18. The actual data written to the internal storage device 20 is data to be written to a predetermined part of the data area 44 of the memory card 18, for example.

  The above processing is realized by the main control unit 12. The main control unit 12 performs a writing process so that the data in the memory card 18 and the internal storage device 20 are in the state shown in FIG.

  When the memory card 18 is taken out, the management table and actual data of the internal storage device 20 are moved to the memory card 18 and the file data is merged thereby.

  Further, when outputting image data, the main controller 12 refers to the memory card 18 and the internal storage device 20 and reads the actual data of the memory card 18 and the internal storage device 20 according to the management table of the internal storage device 20. . Then, the read image data is output by communication.

  As described above, according to the second embodiment of the present invention, the file data is distributed to the first storage means and the second storage means, so that the security is suitably improved as in the first embodiment. It can be secured. According to the present embodiment, since part of the actual data is not written to the first storage unit but is held by the second storage unit, it becomes more difficult to read the data from the first storage unit. Security can be further improved.

  Next, a third embodiment of the present invention will be described. Also in this embodiment, the data recording device is provided in the surveillance camera device. And the surveillance camera apparatus of this Embodiment is equipped with the structure similar to 1st Embodiment shown by FIG. However, the present embodiment differs from the first embodiment in the processing related to image data recording. Hereinafter, descriptions of matters common to the first embodiment will be appropriately omitted.

  FIG. 8 shows the image data writing process of the present embodiment. As illustrated, in the present embodiment, the management table is stored in the internal storage device 20 as in the first embodiment. The actual data is also stored in the memory card 18 as in the first embodiment. However, in the present embodiment, the following processing is performed when writing actual data.

  As already described, in the file system, when the amount of data is large like image data, the actual data is divided into a plurality of fragment data, and the plurality of fragment data is distributed to a plurality of clusters. At this time, in the present embodiment, the arrangement of the plurality of fragment data is forcibly changed from the original arrangement.

  For example, when data is written to the memory card 18 for the first time, clusters 1, 2, 3, and so on are used in order in the conventional data recording apparatus. A plurality of pieces of fragment data are arranged in the original order. However, in the present embodiment, even when data is written to the memory card 18 for the first time, the arrangement of the fragment data is forcibly changed.

  When the arrangement is forcibly changed, an appropriate gap may be provided between the pieces of fragment data. Further, the order of the fragment data may be changed. Further, in order to change the arrangement of fragment data, each fragment data may be written in a randomly selected cluster. Furthermore, the clusters may be used in a predetermined order. At this time, the cluster order is set differently from the order according to the cluster number.

  The above processing is realized by the main control unit 12. The main control unit 12 performs a writing process so that the arrangement of the plurality of pieces of fragment data is not continuously arranged in the original order in the data area 44 of the memory card 18.

  The process for removing the memory card 18 may be the same as in the first embodiment. The image data output process may be the same as in the first embodiment.

  As described above, according to the third embodiment of the present invention, the file data is distributed to the first storage means and the second storage means, so that the security is suitably improved as in the first embodiment. It can be secured. According to the present embodiment, the plurality of pieces of fragment data of the actual data are forcibly changed from the original order, and the actual data are forcibly written in pieces. Thereby, it becomes more difficult to restore data from only actual data, and security can be further improved.

  Next, a fourth embodiment of the present invention will be described. Also in this embodiment, the data recording device is provided in the surveillance camera device. And the surveillance camera apparatus of this Embodiment is equipped with the structure similar to 1st Embodiment shown by FIG. However, the present embodiment differs from the first embodiment in the processing related to image data recording. Hereinafter, descriptions of matters common to the first embodiment will be appropriately omitted.

  FIG. 9 shows the image data writing process of this embodiment. As illustrated, in the present embodiment, the management table is stored in the internal storage device 20 as in the first embodiment. Further, the actual data is also written in the data area 44 of the memory card 18 as in the first embodiment. However, in the present embodiment, processing different from that of the first embodiment is performed on the memory card 18.

  That is, in the first embodiment, the management table of the memory card 18 is empty in the write completion state. On the other hand, in FIG. 8, the fake management table is written in the file system management table area of the memory card 18. The fake management table is different from the correct management table corresponding to the actual data in the data area 44. In the present embodiment, the fake management table is random data. The fake management table may be appropriate data prepared in advance.

  The above processing is realized by the main control unit 12. The main control unit 12 performs a writing process so that the data in the memory card 18 and the internal storage device 20 are in the state shown in FIG. Then, the main control unit 12 generates a false management table and writes it in the memory card 18.

  When the memory card 18 is removed, the management table of the internal storage device 20 is moved to the memory card 18. In the memory card 18, the fake management table is replaced with a regular management table, and thereby file data is merged.

  Further, when outputting image data, the main control unit 12 reads the actual data of the memory card 18 in accordance with the management table of the internal storage device 20. The fake management table of the memory card 18 is not referred to. As a result, the image data can be reconstructed despite using the fake management table. Then, the read image data is output by communication.

  As described above, according to the fourth embodiment of the present invention, since the file data is distributed to the first storage means and the second storage means, the security is suitably improved as in the first embodiment. It can be secured. And according to this Embodiment, since false management data is written in the 1st memory | storage means, reading of the actual data from a 1st memory | storage means becomes still more difficult, and security can be improved further.

  Next, a fifth embodiment of the present invention will be described. Also in this embodiment, the data recording device is provided in the surveillance camera device. And the surveillance camera apparatus of this Embodiment is equipped with the structure similar to 1st Embodiment shown by FIG. However, the present embodiment differs from the first embodiment in the processing related to image data recording. Hereinafter, descriptions of matters common to the first embodiment will be appropriately omitted.

  In the first embodiment, as described above, the actual data is recorded on the memory card 18 and the management table is recorded on the internal storage device 20, whereby the file data is distributed to the memory card 18 and the internal storage device 20. It was. On the other hand, in the present embodiment, each of the actual data and the management table is divided into two and distributed to the memory card 18 and the internal storage device 20.

  FIG. 10 shows image data writing processing according to the present embodiment. As shown in the figure, in this embodiment, the actual data is divided into two and written to the memory card 18 and the internal storage device 20. In addition, the management table is also divided into two and written to the memory card 18 and the internal storage device 20.

  In the example of FIG. 10, the amount of actual data is the same in the memory card 18 and the internal storage device 20 for easy understanding. The data amount of the management table is the same between the memory card 18 and the internal storage device 20. However, the present invention is not limited to this. For example, the actual data and the management table are divided at a ratio according to the capacities of the memory card 18 and the internal storage device 20. Thereby, the memory capacity can be used efficiently.

  The above processing is realized by the main control unit 12. The main control unit 12 performs a writing process so that the data in the memory card 18 and the internal storage device 20 are in the state shown in FIG.

  When the memory card 18 is taken out, the management table and actual data of the internal storage device 20 are moved to the memory card 18 and the file data is merged thereby.

  Further, when outputting image data, the main control unit 12 reads the actual data of the memory card 18 and the internal storage device 20 according to the management table of the memory card 18 and the internal storage device 20. Then, the read image data is output by communication.

  As described above, according to the fifth embodiment of the present invention, since the file data is distributed to the first storage means and the second storage means, the security is suitably improved as in the first embodiment. It can be secured.

  Next, a sixth embodiment of the present invention will be described. Also in this embodiment, the data recording device is provided in the surveillance camera device. And the surveillance camera apparatus of this Embodiment is equipped with the structure similar to 1st Embodiment shown by FIG. However, the present embodiment differs from the first embodiment in the processing related to image data recording. Hereinafter, descriptions of matters common to the first embodiment will be appropriately omitted.

  FIG. 11 shows the image data writing process of this embodiment. As illustrated, in the present embodiment, the management table is stored in the internal storage device 20 as in the first embodiment. The actual data is also stored in the memory card 18 as in the first embodiment. However, in the present embodiment, unlike the first embodiment, the management table is converted.

  In the present embodiment, the management data is converted based on information unique to the device. The device-specific information is, for example, the camera number of the monitoring camera device 10. Further, for example, the device-specific information is a MAC address when the monitoring camera device 10 is a network camera. Here, it is assumed that the camera number is used for the conversion process.

  For example, the camera number is used as follows. Assume that the camera number is 7. Assume that the management table is 123456789abcd. At this time, the management table is rewritten as 7654321dcba98 based on the camera number. Here, the camera number is arranged at a predetermined position (top), and the data order is reversed.

  The above processing is realized by the main control unit 12. That is, the main control unit 12 functions as management data conversion means of the present invention. The main control unit 12 stores an algorithm for conversion processing, and stores a camera number used for the conversion processing. Then, the main control unit 12 converts the management table and writes the converted management table in the internal storage device 20.

  When the memory card 18 is removed, the main control unit 12 reads the management table of the internal storage device 20. The main control unit 12 also stores a re-conversion processing algorithm for restoring the converted management data. The main control unit 12 applies the camera number information to the reconversion algorithm and reproduces (restores) the management table. Here, the main control unit 12 functions as management data reconversion (reproduction) means. Then, the reproduced management table is written into the memory card 18, whereby the file data is combined in the memory card 18.

  Further, when outputting the image data, the main control unit 12 reads the image data with reference to the memory card 18 and the internal storage device 20. Also at this time, the main control unit 12 reproduces the management table. Then, the main control unit 12 reads actual data from the memory card 18 in accordance with the reproduced management table.

  As described above, according to the sixth embodiment of the present invention, since the file data is distributed to the first storage means and the second storage means, the security is suitably improved as in the first embodiment. It can be secured. And according to this Embodiment, since management data are converted, security can be improved.

  The conversion process is based on device-specific information, and the device-specific information is, for example, a device number as described above. Since the conversion process is based on such information, the conversion process is simple. Further, since the management data is targeted, the data amount is small. Therefore, the conversion processing time is short. A huge amount of data processing using a public key is unnecessary.

  Such a simple conversion process with a short processing time is combined with the process of distributing data to the plurality of storage units of the present embodiment, and as a result, the security can be effectively improved while suppressing the processing time. .

  Next, a seventh embodiment of the present invention will be described. Also in this embodiment, the data recording device is provided in the surveillance camera device. And the surveillance camera apparatus of this Embodiment is equipped with the structure similar to 1st Embodiment shown by FIG. However, in the present embodiment, the management table need not be stored in the internal storage device. Therefore, the internal storage device for the management table may be abolished. Further, the present embodiment is different from the first embodiment in the processing related to image data recording. Hereinafter, descriptions of matters common to the first embodiment will be appropriately omitted.

  FIG. 12 shows the image data writing process of the present embodiment. As shown in the figure, in the present embodiment, both the actual data and the management table are written in the memory card 18. However, the management table is written into the memory card 18 after being converted.

  The algorithm of the conversion process may be the same as that in the sixth embodiment. That is, the management table is converted based on information unique to the device such as a camera number.

  The conversion process is performed by the main control unit 12 as in the sixth embodiment. That is, the main control unit 12 functions as management data conversion means. The main control unit 12 stores an algorithm for conversion processing and stores information unique to the apparatus. When the main control unit 12 writes the image file data to the memory card 18, the main control unit 12 executes an algorithm and applies device-specific information to convert the management table. Then, the main control unit 12 controls the memory card interface unit 16 and writes the converted management table in the memory card 18. Actual data is also written to the memory card 18.

  When the memory card 18 is removed, the main control unit 12 reads the management table of the memory card 18. The main control unit 12 also stores a reconversion algorithm. The main control unit 12 applies the device-specific information to the reconversion algorithm and reproduces the management table. Here, the main control unit 12 functions as management data reconversion means. Then, the reproduced management table is returned to the memory card 18. Then, the memory card 18 is taken out.

  Further, when outputting image data, the main control unit 12 reproduces the management table of the memory card 18. Then, the main control unit 12 reads image data from the memory card 18 in accordance with the reproduced management table. Then, the main control unit 12 controls the communication unit 22 to send the read image data.

  As described above, the file data is not distributed in the seventh embodiment of the present invention. However, conversion processing similar to that in the sixth embodiment is performed on the management data. As described in the sixth embodiment, the conversion processing time can be shortened in this embodiment. The conversion process is performed by software and can be realized relatively easily. The conversion process makes it difficult to illegally browse the data in the memory card 18. Therefore, according to this embodiment, it is possible to provide a data recording apparatus that can ensure security and can be easily realized with a short processing time.

  The various embodiments of the present invention have been described above. It goes without saying that the configurations of two or more embodiments described above may be combined in one apparatus.

  In addition, this invention is not limited to the above-mentioned embodiment, Of course, those skilled in the art can modify the above-mentioned embodiment within the scope of the present invention.

  As described above, the data recording apparatus according to the present invention has the effects that security can be ensured, the processing time is short, and it can be easily realized, and is useful as a monitoring camera apparatus or the like.

The block diagram of the surveillance camera apparatus in the 1st Embodiment of this invention Diagram showing file system Diagram showing file system The figure which shows the writing processing of the image data The figure which shows processing at the time of memory card ejection operation Diagram showing the processing when outputting image data The figure which shows the write-in process of the image data in the 2nd Embodiment of this invention The figure which shows the write-in process of the image data in the 3rd Embodiment of this invention The figure which shows the write-in process of the image data in the 4th Embodiment of this invention The figure which shows the write-in process of the image data in the 5th Embodiment of this invention The figure which shows the write-in process of the image data in the 6th Embodiment of this invention The figure which shows the write-in process of the image data in the 7th Embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Surveillance camera apparatus 12 Main control part 14 Imaging part 16 Memory card interface part 18 Memory card 20 Internal storage device 22 Communication part 28 Display part 30 Operation part 40 File system 42 Management table 44 Data area 46 File arrangement information 48 Directory area

Claims (15)

A data acquisition unit for acquiring data to be recorded;
A first storage unit that can be taken out from the outside, and a writing processing unit that performs a process of writing data to a second storage unit different from the first storage unit;
And the write processing unit divides the file data into file data format including file system management data and actual data, and the file data is divided into the first storage unit and the second storage unit. A data recording apparatus that performs a process of writing in the first storage unit and the second storage unit so as to be in a state of being distributed to the unit.   The data recording apparatus according to claim 1, wherein the data acquisition unit acquires image data as the recording target data.   The data according to claim 1, wherein the write processing unit performs a process of writing data to a memory medium that is the first storage unit and an internal storage device that is the second storage unit. Recording device. An extraction request receiving means for receiving an extraction request of the first storage means;
When the retrieval request is accepted, a coalescing processing unit that moves the data in the second storage means to the first storage means and unites the divided file data;
The data recording apparatus according to claim 1, further comprising: An output request receiving means for receiving an output request for the recording target data;
When the output request is received, a reading processing unit that reads the actual data according to the management data with reference to the first storage unit and the second storage unit;
5. A data recording apparatus according to claim 1, further comprising:   6. The data recording apparatus according to claim 1, wherein the write processing unit writes the actual data into the first storage unit and writes the management data into the second storage unit.   The data recording apparatus according to claim 6, wherein the write processing unit writes a part of the actual data in the second storage unit.   The write processing unit forcibly changes the arrangement of the plurality of pieces of fragment data constituting the actual data in the file system from the original arrangement in the order. Data recording device.   2. The data recording apparatus according to claim 1, wherein the write processing unit writes fake management data different from the management data corresponding to the actual data into the management data storage area of the first storage unit.   6. The data recording according to claim 1, wherein the writing processing unit divides the actual data and the management data, respectively, and distributes the divided data to the first storage unit and the second storage unit. apparatus.   11. The data recording apparatus according to claim 1, further comprising management data conversion means for converting the management data based on information unique to the apparatus. A data acquisition unit for acquiring data to be recorded;
A writing processing unit that performs processing of writing data to a storage means that can be taken out from the outside;
The write processing unit is configured to convert the recording target data into a file data format including file system management data and actual data, in a state where the management data is converted based on device-specific information. A data recording apparatus which performs a process of writing in the storage means. A data recording method for causing a computer to record data to be recorded,
A process of writing data to a first storage means that can be taken out from the outside and a second storage means that is different from the first storage means, and the recording target data includes file system management data and actual data A process of writing to the first storage means and the second storage means so that the file data is divided and distributed to the first storage means and the second storage means in the form of file data And a data recording method. A data recording program for causing a computer to execute processing for recording data to be recorded,
A process of writing data to a first storage means that can be taken out from the outside and a second storage means that is different from the first storage means, and the recording target data includes file system management data and actual data The process of writing to the first storage means and the second storage means so that the file data is divided and distributed to the first storage means and the second storage means in the form of file data A data recording program that is executed by a computer. An imaging unit for generating image data;
A first storage unit that can be taken out from the outside, and a writing processing unit that performs a process of writing data to a second storage unit different from the first storage unit;
The write processing unit includes the first storage unit and the second storage unit in which the file data is divided into the image data in a file data format including management data and actual data of a file system. An image pickup apparatus that performs a process of writing to the first storage unit and the second storage unit so as to be in a state of being distributed to each other.

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