Method for Reducing Size of a Digital Audio, Image or Video File

• US 20090012978A1
• Filed: 07/30/2004
• Published: 01/08/2009
• Est. Priority Date: 07/30/2004
• Status: Active Grant

• Current Assignee: Jean-Claude Colin
• Original Assignee: V(6N)
• Inventors: Loiseau, Pascale epouse Gervais
• Granted Patent: US 7,680,807 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04N 19/00 Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
• CPC Class Codes: Y10S 707/99942 Manipulating data structure, e.g. compression, compaction, compilation

Abstract

The inventive method makes it possible to reduce the size of a digital audio, image and/or video file in such a way that a reduced number of representative data needed for reformatting a file is transmitted to a receiving entity encoder. Said method consists in assigning references of at least one file component value to another value of the same component or in integrating at least one reference of the value group of the same component or another component into a component value group.

Claims

1. A method of reduction of the size of a digital, audio, image and/or video file, wherein with the aim of transmitting to a receiving encoder only a reduced number of representative data indispensable for reconfiguring the file according to its original form, it comprises

the association of the references of at least one value of a component of this file with another value that may consist in another value of the same component and/or a value of another component and/or

the integration into a group of values of a component of at least one reference of a group of values of the same component or of another component.

2. A method according to claim 1,

comprising the reduction of the size of components and of the number of components of the file by preserving the characteristic data of at least one component and/or a group of values of one or more components, which serve for both the coding and the restoration of the original number of values of the components and of the original number of the components of the reconfigured file according to its original characteristics.

3. A method according to claim 1, comprising the indiscriminate reduction of identical successive data and of different successive data.

4. A method according to claim 1,

comprising the reduction of the total number of digital data of a single component of an audio (mono), image and/or video file on grey level and of the number of data of a component and/or the number of components of multi-channel audio files, RVB, CMJN, YUV images and of RVB and YUV video files, only transmitting to the encoder the representative data comprising the references of the integrated values and those of the integrating values, it being understood that

a representative datum is an association of at least two values and/or the reference of a group of values associated with another group of values, said values or groups of values potentially belonging to the same component or to a different component,

an integrated value is the quotient of the smaller value of the association of two numbers by the greater value of these two numbers,

the integrating value is the larger value that one must reduce in order to be able to encode it on one or two eight-bit bytes when one has accommodated the reference of the integrated value, this integrating value becoming a representative datum when it has been reduced and has accommodated the reference of the integrated value.

5. A method according to claim 4,

comprising a stage of compression, in turn comprising:

a phase of opening the uncompressed file and of the separation of the audio components and of the separation of colour components (block 1),

a phase of determination of integrated values and of integrating values of the group of integrated values and of the group of integrating values, of the integrated component and of the integrating component (block 2),

a phase of determination of integrated values and of integrating values in representative data, of the conversion of the group of integrated values and the group of integrating values into a group of representative data and of the conversion of the integrated component and of the integrating component into a representative component (block 3) and

a phase of recording of the compacted file (block 4).

6. A method according to claim 1,

comprising a stage of restoration of the compacted file comprising:

a phase of opening of the compacted file (block 5),

a phase of conversion of representative data, of groups of representative data and of representative components into integrating values and into integrated values (block 6),

a phase of restoration of integrating values and integrated values in their approximate or similar original form (block 7),

a phase of reconstruction of audio components and/or colour components of one or more images (block 8) and

a phase of reading of the restored file (block 9).

7. A method according to claim 4,

wherein the association of integrated and integrating values results from an operating sequence comprising the following two stages:

the calculation of the ratio (C_F) between the integrated value (V_I) and the integrating value (V_T) multiplied by 10 et rounded off to a complete value according to the following formula

$C_F=\mathrm{rounded}<br><br><br><br>\mathrm{off}<br><br><br><br>\left(\frac{V_I}{V_T}\times <br><br>10\right)$

the obtaining of the representative datum (Q_R) by the integration of the ratio (C_F) with the integrating value reduced by a variable coefficient (C_V) according to the rate of compression and the desired rate of error, according to the following formula;

$Q_R=\mathrm{rounded}<br><br><br><br>\mathrm{off}<br><br><br><br>\left(\frac{V_T}{C_v}\times <br><br>10\right)+C_F.$

8. A method according to claim 4,

comprising a phase of restoration consisting in dissociating the representative value (Q_R) for reconstructing the integrated value (V_I) and the integrating value (V_T), according to the following formulae:

$\mathrm{VT}=\mathrm{rounded}<br><br><br><br>\mathrm{off}<br><br><br><br>\left(\frac{V_R}{10}\times <br><br>C_V\right),$