Method for fast reconstruction of content information

• US 20070198453A1
• Filed: 07/24/2004
• Published: 08/23/2007
• Est. Priority Date: 08/07/2003
• Status: Active Grant

• Current Assignee: Magnolia Licensing LLC (IP Edge LLC)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Lam, Tak, Chan, Sai
• Granted Patent: US 8,156,072 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G11B 27/105 of operating discs
• CPC Class Codes: G11B 27/11 by using information not detectable on the record carrier

Abstract

The present invention relates to a method for the fast reconstruction of content information of a recording medium. According to the invention, the method comprises the steps of: determining a signature of the recording medium, the signature comprising a plurality of elements; comparing the signature with a plurality of signatures stored in a content database; and retrieving associated content information from the content database if the signature matches a signature stored in the content database.

Claims

1. Method for retrieving the file system of a recording medium, including the steps of:

determining a signature of the recording medium by measuring features based on a data pattern stored on the recording medium, the signature including a plurality of elements;

comparing the signature with a plurality of signatures stored in a content database; and

retrieving the associated file system from the content database if the signature is equal to a signature stored in the content database.

2. Method according to claim 1, wherein the step of comparing the signature with a plurality of signatures stored in a content database includes evaluating the distances between the determined signature and the signatures stored in the content database.

3. Method according to claim 1, wherein the steps of determining the signature of the recording medium and comparing the signature with a plurality of signatures include:

determining a first part of the signature including a plurality of elements;

comparing the first part of the signature with corresponding parts of the plurality of signatures stored in the content database;

determining a further part of the signature if the first part of the signature is equal to the corresponding part of at least one signature stored in the content database; and

comparing the further part of the signature with corresponding parts of the plurality of signatures stored in the content database.

4. Method according to claim 1, wherein, in the comparing steps, a negative progressive search approach is employed, in which the elements of the determined signature are compared with the corresponding elements of the signatures stored in the content database one at a time, wherein every element of the signature may yield a negative search result.

5. Method according to claim 1, further including the steps of:

obtaining the file system from the recording medium if the determined signature is not equal to a signature stored in the content database; and

storing the obtained file system and the determined signature in the content database.

6. Method according to claim 1, wherein the signature is unique for every recording medium.

7. Method according to claim 1, wherein the signature elements are selected from the disk status such as open or closed disk, number of sessions or number of tracks in each session, from timing information such as the lead-in time of each session, the lead-out time of each session, the total time of each session or subcode information of each track, or from data integrity such as data checksums of specific tracks.

8. Apparatus for reading from and/or writing to recording media, wherein it uses a method according to claim 1 for retrieving the file system of the recording medium.

9. Apparatus according to claim 8, wherein it performs the retrieval of the file system of the recording medium after insertion of the recording medium, after transferal of the recording medium into a playback position, or after wake up from a power down mode.