Method for reducing size of a digital audio, image or video file

• US 7,680,807 B2
• Filed: 07/30/2004
• Issued: 03/16/2010
• Est. Priority Date: 07/30/2004
• Status: Expired due to Fees

• Current Assignee: Jean-Claude Colin
• Original Assignee: I-Ces (Sas) (Innovative Compression Engineering Solutions)
• Inventors: Loiseau, Pascale epouse Gervais
• Primary Examiner(s): Trujillo; James
• Assistant Examiner(s): Black; Linh
• Application Number:
  US11/658,870
• Publication Number:
  US 20090012978A1
• Time in Patent Office: 2,055 Days
• Field of Search: 707100-103 Y
• 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. Method for processing an original digital file consisting of a single component of audio, image and/or video file on grey level and/or a number of components of multi-channel audio files, RGB, CMJN, YUV images and/or of RGB and YUV video files, said original digital file being presented in an original form and having a plurality of couples of values, each of said couple comprising a higher value which constitutes an integrated value and a lower value, the two values of each of said couple belonging to a same component or to different components of said original file, said method successively comprising a compressing step for reducing said original file to obtain a compressed file by replacing each of said couples of values by a single compressed representative value which comprises references to said higher value and said lower value to allow an encoder to calculate a reconstituted file having said original form by using said references, said compressing step comprising a phase of calculating an integrated value which is a quotient of a number which represents said lower value by a number which represents said integrating value, a phase of compressing the integrating value according to a desired compression rate an/or error rate to obtain a compressed integrating value, by adding to said compressed integrating value said integrated value to obtain said single compressed representative value and a phase of coding said representative value on one or two bytes.

2. A method according to claim 1,

wherein said compressing stage comprises:

a phase of opening said original file and of the separating audio components and colour components thereof,

a phase of determining of integrated values and integrating values of a group of integrated values and a group of integrating values, or of an integrated component and an integrating component,

a phase of converting said integrated values and said integrating values in representative data, or of converting said group of integrated values and said group of integrating values into a group of representative data or of converting said integrated component and said integrating component into a representative component,

a phase of generating a compacted file comprising said representative data, said group of representative data or said representative component,

a phase of recording said compacted file.

3. A method according to claim 2, wherein said reconstituted file is obtained by a sequence comprising:

a phase of opening said compacted file,

a phase of converting said representative data, said groups of representative data or said representative components into reconstituted integrating values and into reconstituted values,

a phase of generating a reconstituted file having audio components and/or colours components of one or more images from said reconstituted integrating values and from said reconstituted integrated values, said reconstituted file having a form similar to that of the original file

a phase of reading said reconstituted file.

4. Method for processing a digital audio, image and/or video file presented in an original form and having at least an original couple of values comprising a highest value and lowest value, said method successively comprising a step of reducing said original couple of values in a compressed representative value Q_R and a step of constituting a reconstructed file having a form similar to that of the original file from said compressed representative value Q_R wherein

i) said reducing step comprises the following phases

a first phase of selecting said couple of values,

a second phase of determining for each of said couple an integrating value V_T consisting of said highest value of said couple and an integrated value equal to the quotient of said lowest value V_I by said highest value,

a third phase of determining a compressed representative value Q_R from which a reconstructed file having a reconstructed couple of values close to said original couple of values can be obtained, said compressed representative value Q_R being equal to the sum of a first value C_F and a second value, said first value being equal to a product of a ratio between said integrated value multiplied by ten into the said integrating value V_T, said ratio being rounded off to a whole value, according to a first formula:

5. Method for processing a digital file having several components, said method comprising:

a first step of cutting up said components into fixed value blocks,

a second step of calculating an average of each block of each of said components by calculating a ratio between the sum of the values of the block and the number of values contained in said block,

a third step of determining at least a group of integrating values V_T comprising the values having the highest average and a group having lowest values,

a fourth step of conversion of the group of integrated values and of the group of integrating values into a single group of representative data Q_R wherein each representative data Q_R of said single group is calculated according to the relation;