JP4208029B2 - Data management method - Google Patents

Description

  The present invention relates to a data management method for managing, for example, image data captured by a camera device by changing management information including address information and the like.

  Conventionally, for example, image data indicating an image captured by a digital still camera device is stored in a recording medium such as an optical disk with a predetermined capacity. This optical disc has a data area for storing a plurality of image data and a management area for storing management information for managing the image data stored in the data area. These image data constitute a data file as a data block having a predetermined capacity. That is, the optical disk stores a plurality of data files composed of a plurality of data blocks and management information indicating the data files.

  Here, the second data file is constituted by at least a part of the plurality of data blocks 1 to 6 constituting the first data file, and the first data file and the second data file are formed. An example when dividing is described.

  Conventionally, when dividing the first data file, first, the first management information 100 shown in FIG. 7A and the first data file indicated by the first management information 100 are read from the optical disc. The first management information 100 includes address information indicating the address of the data block constituting the first data file, and file name information 102 indicating the file name of the first data file.

  Here, when data blocks belonging to the first data file corresponding to the addresses 5 and 6 of the first management information are used as data blocks constituting the second data file, they are stored in the first data file. Among the existing data blocks, the data blocks corresponding to address 5 and address 6 are read. Then, the data block read from the optical disk is temporarily stored in the memory.

  Next, as shown in FIG. 7B, the second management information 110 indicating the second data file for storing the data blocks corresponding to the addresses 5 and 6 of the first data file is stored in the memory. To create.

  Next, an address is created when the data block corresponding to the above address 5 and address 6 is written on the optical disc as the second file data. Here, address 7 and address 8 are written in the memory in the address information of the second management information 110.

  Next, as shown in FIG. 7C, the address information of address 5 and address 6 of the first management information 100 is deleted on the memory.

  Then, by writing the data block corresponding to the addresses 7 and 8 stored in the memory, the first management information 100, and the second management information 110 to the optical disc, the addresses 1 to 1 of the first management information 100 are written. 6, the first data file composed of data blocks corresponding to addresses 1 to 4 of the first management information 100, and the second management information 110. Are divided into second data files composed of data blocks corresponding to the addresses 7 and 8.

  Further, as a conventional data management method, for example, FIG. 8 shows an example when the small image data 1 is deleted. When the small image data 1 is deleted in this way, the small image address 1 stored in the small image management information 150 is also deleted.

  At this time, in the conventional data management method, first, among the small image management information 150 shown in FIG. 8A, small image addresses 2 to 8 and small image data 2 to 2 corresponding to these small image addresses 2 to 8 are used. 8 is read from the optical disc and temporarily stored in the memory. Next, in the conventional data management method, as shown in FIG. 8B, the small image management information 150 is written in the optical disk with the small image addresses 2 to 8 once stored in the memory in the above process, and the small image address. The small image data 1 is deleted by writing image data 2 to 8 corresponding to 2 to 8 on the optical disc.

Japanese Patent Laid-Open No. 06-231016

  By the way, in the method of managing data described above, it is necessary to read / write data blocks stored in the second data file among the data blocks stored in the first data file.

  However, in such a method, when data files are divided, it is indispensable to read and write data blocks, and thus it takes time to read and write data blocks constituting the first data file. . Furthermore, this problem becomes more prominent if the capacity of the data blocks constituting the first data file increases.

  In the data management method described above, when deleting the small image data 1, it is necessary to read the small image data 2 to 8 once from the optical disk to the memory and write the small image data 2 to 8, so that reading and writing are performed. It takes time to do.

  Therefore, the present invention has been proposed in view of the above-described circumstances, and an object thereof is to provide a data management method capable of shortening the time required for dividing a data file.

The present invention provides management information comprising a plurality of data blocks of a predetermined capacity constituting a data file, data file information indicating the file name of the data file, and address information of each data block constituting the data file In the data management method for managing the data block stored in the recording medium having the above and dividing the data file, first management information indicating a first data file composed of a plurality of data blocks having a predetermined capacity A first management information reading step for reading out from the recording medium, and a second management information indicating a second data file comprising a second data file composed of at least a part of data blocks of the first data file Management information creation step, and in the first management information reading step, the data block immediately after the division position is First management information indicating a first data file composed of a plurality of data blocks including the data block having the predetermined capacity in which image data including images is recorded is read. In the second management information creation step, The address information of the data block including the data block immediately after the division position included in the address information of the first management information read in the first management information reading step is moved, and the data immediately after the division position The second management information indicating the second data file including the data block including the data block immediately after the division position is generated as address information of the second management information indicating the data block including the block. The data block including the data block immediately after the division position is used as the data block of the second data file. The features.

  In the data management method according to the present invention, in the first management information reading step, a first data block including a plurality of data blocks including a data block having the predetermined capacity in which image data including a data block immediately after the division position is recorded. First management information indicating a data file is read, and in the second management information creation step, the division position included in the address information of the first management information read in the first management information read step is read. The address information of the data block including the data block immediately after is moved, and the address information of the second management information indicating the data block including the data block immediately after the division position is used, and the data including the data block immediately after the division position is used. The second management information indicating the second data file composed of blocks is created, and the data immediately after the division position is created. A data block including a data block by data block of the second data file, it is possible to reduce the amount of data to read and write data blocks when dividing the first data file. Therefore, according to this data management method, it is possible to move the data block without reading / writing the data block corresponding to the address information together with the address information as in the prior art. It is possible to shorten the time required for data movement or the like.

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

  This data management method can be applied to, for example, a data recording / reproducing apparatus that captures a still image and generates a data block including image data having a predetermined capacity.

  A data recording / reproducing apparatus 1 to which this data file management method can be applied includes, for example, as shown in FIGS. 1 and 2, a disk drive 2 in which an optical disk 20 is stored and data is written to and read from the optical disk 20, A disk I / F (interface) 3 and a CPU (Central Processing Unit) 4 as control means for controlling the disk drive 2, the disk I / F 3 and the like are provided.

  The data recording / reproducing apparatus 1 includes a ROM (Read Only Memory) 5 that stores a program of the CPU 4, a DRAM (Dynamic Random Access Memory) 6 that is a recording area of the CPU 4, a keyboard 7 for operation, and a keyboard. 7 includes a key I / F (interface) 8 that supplies a signal input from the bus 7 to the bus, a video random access memory (VRAM) 9 that records image data, and a monitor 10 that displays an image. In the data recording / reproducing apparatus 1, the CPU 4, ROM 5, DRAM 6, disk I / F 3, key I / F 8, and VRAM 9 exchange signals with each other via a bus.

  As shown in FIG. 2, the optical disc 20 is provided with a data area 21 for recording a plurality of data blocks, and an inner circumference side of the data area 21, and the data blocks recorded in the data area 21. A management area 22 for recording management information is provided. The management information recorded in the management area 22 includes, for example, data file information 22a indicating the data file name of the data file in which the data block is stored and address information 22b indicating the address of each data block.

  This address information 22b indicates the address of each data block stored in the data area as shown in FIG. 3A, for example, and has a so-called link structure. That is, in the address information 22b shown in FIG. 3A, the address indicating the data block 1 is stored in the address 1, the address indicating the data block 2 is stored in the address 2, and the data block is stored in the address 3. An address indicating 3 is stored.

  The address information 22b has a so-called tree structure, for example, as shown in FIG. 3B. Indirect blocks 22c are stored in the addresses 1 to 6, and the addresses 1 to 10 of the indirect block 22c are stored. May store an address indicating each data block.

  Furthermore, the address information 22b has a so-called tree structure as shown in FIG. 3C, for example, and stores the primary indirect block 22c in each address 1 to 6, and each address 1 to 1 in the primary indirect block 22c. 10 may store the secondary indirect block 22d. The address information 22b may store an address indicating each data block in each address 1 to 10 of the secondary indirect block 22d.

  On the other hand, the data area stores a plurality of data blocks for each data file. This data block is information of a predetermined capacity indicating, for example, one still image.

  Next, each component of the data recording / reproducing apparatus 1 will be described.

  The ROM 5 stores a program for the CPU 4. The DRAM 6 is a variable area for the CPU 4 and temporarily stores data or programs.

  The disk I / F 3 is an interface between the CPU 4 and the disk drive 2. In this embodiment, the optical disk 20 is stored in the disk drive 2, and data input via the disk I / F 3 at the time of data recording is written to the optical disk 20 by the disk drive 2. In the data recording / reproducing apparatus 1, data read from the optical disk 20 by the disk drive 2 during data reproduction is supplied to the VRAM 9 and the like via the disk I / F 3.

  The keyboard 7 is operated by a user, for example, and sends a signal corresponding thereto to the key I / F 8. The key I / F 8 supplies a signal from the keyboard 7 on the bus.

  The VRAM 9 is a memory for storing image data regarding an image displayed on the monitor 10. In the data recording / reproducing apparatus 1, for example, when image data is recorded on the optical disc 20, the image data is read by the disc drive 2 during reproduction of the optical disc 20, and supplied to the VRAM 9 via the disc I / F 3 and the bus. The image data stored in the VRAM 9 is displayed on the monitor 10 as a still image or a moving image.

  The CPU 4 controls each part constituting the data recording / reproducing apparatus 1. For example, when dividing a data file, the CPU 4 stores the data file in the ROM 5 and executes the program.

  Next, an example of managing data stored in the optical disc 20 using the data recording / reproducing apparatus 1 described above will be described.

  As shown in FIG. 4, the data recording / reproducing apparatus 1 reads the first management information 40 indicating the first data file to be divided, and among the plurality of data blocks constituting the first data file. The second management information 41 indicating the second data file composed of a part of the first management information 40 is created, and the partial address information 40a of the first management information 40 is used as the address information 41a of the second management information 41. To move.

  That is, in the data recording / reproducing apparatus 1, first, an input signal for dividing the first data file indicated by the first management information 40 from the keyboard 7 into a first data file and a second data file. Is input to the CPU 4 via the key I / F 8. The CPU 4 to which such an input signal is input starts a data management program stored in the ROM 5. In the CPU 4, as shown in FIG. 4A, the first management information 40 indicating the first data file to be divided and stored in the management area 22 of the optical disk 20 is stored in the disk drive 2. Read from the optical disc 20. Then, the CPU 4 temporarily stores the first management information 40 in the DRAM 6.

  Next, in the CPU 4, as shown in FIG. 4B, a second data block composed of some data blocks among a plurality of data blocks constituting the first data file in accordance with the data management program fetched from the ROM 5. The second management information 41 indicating the data file is created on the DRAM 6.

  Next, in the CPU 4, as shown in FIG. 4C, the address 4 and the address 5 of the first management information 40 are read from the DRAM 6, and the address 5 and the address of the first management information 40 are stored in the second management information 41. Write address 6. As a result, the second data file is composed of data blocks indicated by address 5 and address 6.

  At this time, the CPU 4 deletes the data block corresponding to the address 5 and the address 6 from the first data file by deleting the address 5 and the address 6 of the first management information 40 stored in the DRAM 6. It will be.

  As described above, in the data recording / reproducing apparatus 1, the first management information 40 is moved so that the partial addresses 5 and 6 of the first management information 40 become the addresses 5 and 6 of the second management information 41. A part of a plurality of data blocks constituting the data file can be used as a data block constituting the second data file. Therefore, in this data recording / reproducing apparatus 1, when the data block is moved and divided so that the first data file becomes the first data file and the second data file as in the prior art, the optical disk 20 is divided. The data file can be divided without reading the data block stored in the second data file and storing it again in the second data file of the optical disc 20 for division. Therefore, according to the data recording / reproducing apparatus 1, it is possible to divide the data file in a short time compared to the conventional case.

  Further, the data recording / reproducing apparatus 1 may manage data blocks composed of small image data. This small image data is used, for example, when displayed on the monitor 10 for image selection. The small image management information 50 for managing the small image data indicates a data file composed of the small image data as shown in FIG. The small image management information 50 includes file information and address information indicating small image addresses 1 to 8 corresponding to the small image data 1 to 8.

  The small image data 1 to 8 have a capacity of about half of each address indicating each data block described above, and are handled as one data block by two small image data. That is, when the first data file is divided into the first data file and the second data file in the operation of the data recording / reproducing apparatus described above, it can be divided only for each data block.

  When such deletion of the small image data 1 is performed, the data recording / reproducing apparatus 1 first adds the first small image management information 50 indicating the first data file as shown in FIG. Processing similar to that shown in FIG. 4 is performed. That is, in the data recording / reproducing apparatus 1, the first data file indicated by the first small image management information 50 is divided so as to be the first data file 50 and the second data file 50a. By performing such processing, a first data file composed of small image data 1 and 2 and a second data file composed of small image data 3 to 8 are created. At this time, as shown in FIG. 6B, the first small image management information 50 includes the first small image management information 50 including addresses 1 and 2 and the second small image including addresses 3 to 8. The management information 50a is divided on the DRAM 6.

  Next, when the small image data 1 is deleted from the first data file, the first small image management information 50 has the address 1 in the first small image management information 50 as shown in FIG. Is deleted. At this time, the CPU 4 reads the first small image management information 50 and the small image data 2 corresponding to the address 2 from the optical disk 20, temporarily stores them in the DRAM 6, and stores the first small image management information 50 stored in the DRAM 6. The small image data 2 corresponding to the address 2 and the address 2 is written to the first small image management information 50 of the optical disc 20 and the small image data 2 is written. In this data recording / reproducing apparatus 1, by performing such processing, the first data file storing the small image data 1 to 8 is changed to the first data file composed of the small image data 1 and 2. A second data file composed of small image data 3 to 8 can be obtained.

  In such a data recording / reproducing apparatus 1, after each small image data is divided for the first data file and the first management information, the small image data and addresses that are less than one data block are deleted as necessary. Therefore, image data can be deleted at a higher speed than conventional image data deletion. That is, in the data recording / reproducing apparatus 1 described above, since the data file is divided within a range that can be handled in units of one data block, the amount of data read and written from the optical disc 20 can be reduced, and the time for deleting the small image data is reduced. It can be shortened.

It is a block diagram which shows an example of the data recording / reproducing apparatus which can apply the data management method based on this invention. It is a figure which shows an example of the optical disk which has a data area and a management area. It is a figure which shows the management information stored in the management area | region of an optical disk, (a) is a figure which shows an example of a link structure, (b) is a figure which shows an example of a tree structure, (c) is a tree structure It is a figure which shows another example of. It is a figure which shows an example of the data management method which concerns on this invention, (a) is a figure which shows an example of the 1st management information corresponding to a 1st data file, (b) is a 2nd data file It is a figure which shows an example when corresponding 2nd management information is produced, (c) moves the address 5 and the address 6 of 1st management information, and uses a 1st data file as a 2nd management area. It is a figure which shows an example when dividing | segmenting. It is a figure which shows the relationship with the small image data corresponding to the address of small image management information and small image management information. It is a figure which shows the other data management method based on this invention, (a) is a figure which shows an example of the 1st small image management information corresponding to a 1st data file, (b) is a 1st small image management information. It is an example when the second small image management information corresponding to the second data file is created by dividing the image management information, and (c) is a case where a part of the first small image management information is deleted. It is a figure which shows an example. It is a figure which shows an example of the conventional data management method, (a) is a figure which shows 1st management information, (b) is the address of 2nd management information in the data block corresponding to the address 5 and the address 6 (C) is a diagram showing an example when address 5 and address 6 of the first management information are deleted. It is a figure which shows an example when deleting a part of small image management information in the conventional method, (a) is a figure which shows an example of small image management information, (b) is a part of small image management information It is a figure which shows an example when deleting.

Explanation of symbols

  20 Optical disc

Claims (5)

A record having a plurality of data blocks of a predetermined capacity constituting a data file, management information comprising data file information indicating the file name of the data file and address information of each data block constituting the data file In a data management method for managing the data block stored in a medium and dividing the data file ,
A first management information reading step of reading from the recording medium first management information indicating a first data file comprising a plurality of data blocks of a predetermined capacity;
A second management information creating step of creating second management information indicating a second data file composed of at least a part of data blocks of the first data file,
In the first management information reading step, a first management showing a first data file composed of a plurality of data blocks including a data block of the predetermined capacity in which image data including a data block immediately after the division position is recorded. Read information,
In the second management information creation step, the address information of the data block including the data block immediately after the division position included in the address information of the first management information read in the first management information read step The second data composed of the data block including the data block immediately after the division position, and the address information of the second management information indicating the data block including the data block immediately after the division position. Create second management information indicating the file,
A data management method, wherein a data block including a data block immediately after the division position is used as a data block of the second data file.   The data management method according to claim 1, wherein the management information has a link structure.   The data management method according to claim 1, wherein the management information has a tree structure. The data management method according to claim 1, wherein the data block is image data having a predetermined capacity . When deleting some data belonging to the first data file before division,
Perform the division with the data block including the partial data to be deleted as the division position,
Deletion of the data block including the partial data to be deleted in the first data file after the division by writing data that is not deleted among all data of the data block including the partial data to be deleted The data management method according to claim 1, wherein partial data is deleted.

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