JP3323524B2 - Optical disc difference information extraction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus using a write-once optical disk or a rewritable optical disk, and more particularly, to a difference between optical disks having means for compensating consistency between information stored on the optical disk and management information of a host device. It relates to the extraction method.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. 62-271092
As described in Japanese Unexamined Patent Publication, when updating image information stored in a storage medium such as a video tape, the update information is simultaneously stored in an update code area provided in the storage medium, thereby storing the update information in the storage medium. There is known an information storage and retrieval device which can determine whether or not the updated image information is updated.

[0003]

In the above-mentioned prior art, no consideration is given to the significance (validity) of the update information, so that the update information is redundantly detected every time the update information is extracted.

That is, according to this conventional technique, when the data body (image information) is updated a plurality of times, it is determined that all the data has been updated from the second time on, so that the valid data is the last time. Even though it is only the thing, even the one that is no longer needed in the middle is detected. In order to avoid duplicate extraction of the update information, it is conceivable to use a method such as rewriting the update code area of the update information once extracted or acquiring a journal. However, both require an update code area and a journal area, and when managing a primary storage medium (image information storage medium) with a plurality of secondary storage media (databases), each database requires the update storage area. Therefore, there is a problem that it is not possible to rewrite each update code area or delete journal information because the versions to be updated are different.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide an optical disk storing a data body and its update information (data management record information) and a database storing management information of the optical disk. In a database system having no update code and journal area, it is not necessary to avoid duplicate extraction of update information, and the update code area of update information once extracted or the history of journal reflection information is managed and controlled. It is an object of the present invention to provide an optical disk difference information extraction method that can always obtain consistency between update information (data management record information) on an optical disk and management information on a database without requiring such processing.

[0006]

To achieve the above object, the present invention provides an optical disk storing a data body and management record information of the data body, an electronic filing system using the optical disk, and management information of the optical disk. And a management means for managing the electronic filing system and the database, wherein the management record information includes data search information including a data name, and the latest update time of the data body. The management information includes last sector position information and storage time information when the last sector position information is stored in a database, and the electronic filing system includes: Is the image input section, image filing section, optical The image filing unit writes the image information obtained by the image input unit on the optical disk, and performs the writing operation independently of storing the management information in the database. The management means has a means for comparing the update time information and the storage time information after the image filing on the optical disc, and extracting the difference information whose update time is determined to be after the storage time, Further, when the difference information is extracted, means for replacing the storage time information and the sector position information on the database with the latest update time information on the optical disk and the sector position information at that time based on the difference information. Have

The management means may further include, when the difference information is extracted, store the storage time information and the sector position information in the database based on the difference information, and update the latest update time information and the Means for replacing the sector position information.

[0008] The database may be configured to store optical disc information including the data search information and the last sector position information.

The optical disk may be either a write-once optical disk or a rewritable optical disk.

[0010]

The operation based on the above configuration will be described.

According to the present invention, an optical disk (primary medium)
Each time the data body such as the above video information is updated, the update time information indicating the update time (date / time) and the sector position information at that time are added to the management record together with the search information (data name). The information (index management record in the embodiment) is stored in a part of the optical disc.
This management record information is stored in a database (secondary medium) in the form of a database. In this case,
The database stores only the last sector position information, the storage time (date / time) when the last sector position information was stored in the database, and the search information (data name). Management means (each processing unit 1, 2, 6 in the embodiment)
Compares the latest update time on the optical disk with the time of storage in the database, and when it is determined that the update time is later than the storage time, extracts difference information, and based on this, The above storage time (storage time information) and sector position (sector position information) are rewritten to the latest update time (update time information) and the last sector position (sector position information).

Thus, since the management information (the last sector position information and the storage time information) corresponding to the latest management record information on the optical disk is always stored in the database, consistency between the two media is ensured. It will be.

In addition, since only the last sector position information, storage time information and search information can be used to manage the update state of the optical disc, the update code area of the update information once extracted as in the prior art. Update information, and the update information is not redundantly extracted without having to manage the history of journal reflection information.

[0014]

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

FIG. 1 is a schematic diagram of an image data update processing system according to an embodiment of the present invention. In the figure, arrows indicate processing requests and data movement references. FIG. 2 is a diagram showing a storage method when image information is stored in an optical disk, FIG. 3 is a diagram showing management information created in a database, and FIG. 4 is a diagram showing optical disk information created in a database.

In FIG. 1, the processing system includes a host device 10, an electronic filing system 20, and a database 5. The host device 10 stores update information management processing unit 1, update type setting processing unit 2, and optical disk information. It has a database 5 as a file to be stored. The database 5 stores management information 3 and optical disc information 4. In this embodiment, the image data itself is not stored in the database 5 but is stored in the electronic filing system 20, and only information for its management is stored in the database 5 as the management information 3 and the optical disk information 4. Stored. The electronic filing system 20 includes an update information extraction processing unit 6, an image filing unit 8, an image input unit 9, and an optical disk 7.

First, at the time of image filing, the image filing unit 8 writes the image information obtained by the image input unit 9 to the optical disk 7. The operation at this time is performed only by the electronic filing system 20. The storage method at this time is
This will be described with reference to FIG. A plurality of image data (images) P0, P1, P as shown in FIG.
2,... And their management information (index management record) are included in, for example, each track.

The image filing unit 8 uses the sector I2, which is an unused index sector of the index management record, for updating an image on a write-once optical disc, for example, for updating image data P1 that has already been written (image input). The updated date and time are registered in a frame 723, the image obtained from the image input unit 9 is registered in the image data area P2, and the position of the area P2 is stored in a frame 724.
In the frame 721, the sector position 711 of the index sector to be updated is copied.

In the case of a rewritable optical disk, the image obtained from the image input section 9 is replaced with the contents of the area P1, and the date and time when the image is updated are indicated by a frame 713 of the index sector I1 for managing the image data area P1. To memorize.

In the case of deleting an image, the write-once optical disc uses sector I2, which is an unused index sector, and uses a frame 72.
3, the deleted date and time are stored in a frame 722, and the position of the index sector I1 to be an invalid index sector is stored in a frame 722.
In the rewritable optical disk, the date and time of the deletion are stored in the frame 713 of the index sector I1, which is the index sector to be deleted, and the own position I1 to be the invalid index sector is stored in the frame 712.

In the case of new registration, a write-once type,
In the rewrite type, the sector I2, which is an unused index sector of the index management record, is created, and the image input unit 9
Is registered in the area P2. At this time, the registered date and time are also written in the frame 723.

Next, the process of extracting difference information in host management after image filing will be described with reference to FIGS. 3, 4, and 5. FIG. FIG. 5 shows a process for one record (image data).
Is processing by the update information management processing unit, steps 502 to 5
03 is a process by the update information extraction processing unit 6, step 50
Steps 4 and thereafter are mainly performed by the update type setting processing unit 2 of the host device 10.

First, from the management information 3 of the database 5 which is the file storing the information of the optical disk, the update information management processing section 1 obtains the date and time 300 when the previous optical disk information was stored, and the last of the index management record. The sector position 301 is obtained (step 501) and passed to the update information extraction processing unit 6. In a state where the management information 3 and the optical disk information 4 have not yet been entered for the first time, the values of these information are all “0”, for example. For the second and subsequent times, the previous value is entered. Update information extraction processing unit 6
Inputs an index sector In, which is one record in the index management record of the optical disk (step 502), and updates the update date and time 7n3 in the sector In with the date and time passed from the update information management processing unit 1. 300 is compared (step 503). The date / time 300 and the sector position 301 of the management information 3 are used as comparison information common to each record (I0, I1, I2,...). If the date / time 7n3 is after the date / time 300, 7n3 and the like are passed to the update type setting processing unit 2 as difference information.

The update type setting processing unit 2 identifies whether the received difference information is addition, update, or deletion of new image data. If the invalid sector position of 7n2 is designated, the processing unit 2 deletes the image (step 504). Therefore, the sector position 4n1 of the optical disk information 4 in the database 5 is equal to the sector position 7n1 of the index management record. Is deleted (step 508). Next, for an image other than the deleted image, if the 7n1 sector position is located before the sector position 301 of the management information 3, the image is updated (step 505). The image information of Hn having the same sector position 7n1 is updated (step 507). In cases other than the above, the image information Hn is added to the optical disk information 4 as an addition (step 506). This process is repeated up to the registration last index sector position of the optical disk (step 509). As described above, matching between the index management record (FIG. 2) on the optical disk and the optical disk information 4 can be achieved.

When the registered final index sector position is reached, the update information extraction processing unit 6 passes the current date, time and the last index sector position of the index management record to the update information management processing unit 1. The update information management processing unit 1 updates the date / time 300 and the sector position 301 of the management information 3 as the management information of the optical disc, and ends the processing. Therefore, the date / time information 30 of the management information 3
0 and the sector position indicate the latest date and time of the index management record on the optical disk 7 and the last sector position. This management information 3 is used for the next difference information extraction process.

[0026]

As described above in detail, according to the present invention, even if the data body and its management record information on the optical disk are frequently updated, the management information always corresponds to the latest management record information in the database. Is stored, the consistency between the optical disk and the database is guaranteed, and the processing can be speeded up.

Further, since the management information stored in the database is always the latest and latest information, only the effective management record information can be extracted without the need to manage the history of the journal reflection information. There is.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an image data update processing system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a storage method when storing an image on an optical disc.

FIG. 3 is a diagram showing management information created in a database.

FIG. 4 is a diagram showing optical disk information created in a database.

FIG. 5 is a diagram showing a flow of a difference information extraction process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Update information management processing part 2 Update type setting processing part 3 Management information 4 Optical disk information 5 Database 6 Update information extraction processing part 7 Optical disk 8 Image filing part 9 Image input part 10 Host device 20 Electronic filing system

Continuation of the front page (56) References JP-A-3-171370 (JP, A) JP-A-63-201845 (JP, A) JP-A-2-23437 (JP, A) JP-A-3-166634 (JP) , A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G06F 12/00, 3/08, 17/30

Claims (3)

(57) [Claims] 1. A data body and an optical disk which stores management record information of the data body, an electronic filing system using this optical disk, and a database for storing management information of the optical disc, the electronic filing system and said database management The management record information includes data search information including a data name , update time information indicating the latest update time of the data body, and sector position information at that time, the management information includes the last sector position information, and stores the time information when storing the last sector location information in the database, the electronic filing system includes an image input unit, image off
Equipped with a firing unit, optical disk and update information extraction processing unit
The image information obtained by the image input unit is
Writing on the optical disk by the
Operation is independent of storing management information in the database
And the management means performs image filing on the optical disc.
Later, the compared update time information and the storage time information, and having a means for extracting the update timing difference information is determined to be the storage time later, further, before
When the difference information is extracted, the previous
Storage time information and sector position information on the database
The latest update time information on the optical disc and the
A difference information extracting method for an optical disk, comprising: means for replacing the information with the sector position information of the optical disk. Wherein on the database, the data search information and the claim 1 difference information extraction method of the optical disc, wherein a configured to store optical information consisting of the last sector location information. Wherein the optical disc, the difference information extraction method according to claim 1 or 2, wherein the optical disc is characterized by being configured in write-once optical disc or a rewritable optical disc.