Code transforming apparatus and code transforming method

• US 20070256057A1
• Filed: 04/27/2007
• Published: 11/01/2007
• Est. Priority Date: 04/28/2006
• Status: Active Grant

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Matsubara, Akio
• Granted Patent: US 8,081,093 B2
• Time in Patent Office: Days
• US Class Current: 717/136
• CPC Class Codes: H04N 19/63 using sub-band based transform, e.g. wavelets
• CPC Class Codes: H04N 19/64 characterised by ordering of coefficients or of bits for transmission
• CPC Class Codes: H04N 19/645 by grouping of coefficients into blocks after the transform
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards

Abstract

A code transforming apparatus inputs therein a first codestream of a target file, and outputs a second codestream transformed from the first codestream. In the code transforming apparatus, a BOX decomposing unit extracts BOX information from the first codestream. A sharing/referencing determining unit determines whether sharing process or referencing process is to be performed on the BOX information. A sharing/referencing processing unit performs the sharing process or the referencing process on the BOX information based on a determination result from the sharing/referencing determining unit. The sharing/referencing processing unit can specify a logical set of codes on a referenced side as a unit of reference for referencing an incremental codestream.

Claims

1. A code transforming apparatus that performs a transforming process to transform a first codestream of a target file to a second codestream that is equivalent in content to the first codestream and smaller in file size, the code transforming apparatus comprising:

an extracting unit to extract BOX information from the first codestream;

a determining unit to determine whether any one of a sharing process and a referencing process is to be performed on the BOX information; and

a processing unit to perform any one of the sharing process and the referencing process on the BOX information based on a determination result from the determining unit, wherein

the processing unit can specify a logical set of codes on a referenced side as a unit of reference for referencing an incremental codestream.

2. The code transforming apparatus according to claim 1, wherein at least one of a local file and a remote file other than the target file is subjected to any one of the sharing process and the referencing process in the transforming process.

3. The code transforming apparatus according to claim 1, further comprising an input unit through which an instruction is input to specify whether the BOX information is to be subjected to any one of the sharing process and the referencing process in the transforming process.

4. The code transforming apparatus according to claim 1, further comprising a report creating unit to create a status report indicating content of the transforming process.

5. A code transforming method of a transforming process to transform a first codestream of a target file to a second codestream that is equivalent in content to the first codestream and smaller in file size, the code transforming method comprising:

extracting BOX information from the first codestream;

determining whether any one of a sharing process and a referencing process is to be performed on the BOX information; and

performing any one of the sharing process and the referencing process on the BOX information based on a determination result obtained as a result of determining whether any one of the sharing and referencing processes are to be performed, wherein

during processing, a logical set of codes on a referenced side can be specified as a unit of reference for referencing an incremental codestream.

6. The code transforming method according to claim 5, wherein at least one of a local file and a remote file other than the target file is subjected to any one of the sharing process and the referencing process in the transforming process.

7. The code transforming method according to claim 5, further comprising inputting an instruction to specify whether the BOX information is to be subjected to any one of the sharing process and the referencing process in the transforming process.

8. The code transforming method according to claim 5, further comprising creating a status report indicating content of the transforming process.