Method for compressing numerical values ​​of image, audio and/or video files

A technology for video files and compressed values, applied in the field of digital values, digital values ​​of files, and can solve problems such as unsatisfactory

Inactive Publication Date: 2016-10-19
简·克劳德·科林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is still unsatisfactory in terms of the desired compression ratio

Method used

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  • Method for compressing numerical values ​​of image, audio and/or video files
  • Method for compressing numerical values ​​of image, audio and/or video files

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Embodiment Construction

[0024] According to the present invention, the compression method can be expressed by the following general formula:

[0025] Given an initial sequence S of first values ​​Va,...,Vp,Vq,...,Vz,

[0026] - the compressed value VCa of the first value Va of the sequence S is: VCa=Va; the restored value VDa of the compressed value VCa is: VDa=Ca=Va, and,

[0027] - For a current value Vq different from Va, the sequence S is like this:

[0028] o Given the decompressed value VDp corresponding to the value Vp preceding the current value Vq in the sequence S

[0029] o The compressed value VCq of the current value Vq is:

[0030] VCq=+|round[f(Dq)]|, if Dq>0, and

[0031] VCq=-|round [f(Dq)], if Dq<0,

[0032] Among them, Dq=Vq-VDp

[0033] o The decompressed value VDq corresponding to the current value Vq is:

[0034] VDq=+|round [f -1 (VCq)]|+VDp, if VCq>0, and

[0035] VDq=-|round [f -1 (VCq)]|+VDp, if VCq<0

[0036] o rounded to the nearest integer, and

[0037] o where...

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Abstract

A method is disclosed for compressing a sequence of initial digital values into a compressed sequence of compressed values, intending to restore these values into a decompressed sequence of decompressed values. For a first initial value of the sequence, the compressed value of the first initial value is equal to the first initial value and the decompressed value of the compressed value of the first initial value is equal to the first initial value. For each current initial value, the method includes calculating the difference between the current initial value and the decompressed value of the initial value immediately preceding the current value, calculating a compressed value of the difference using a complementary compression function, calculating the decompressed value corresponding to said current initial value, applying the three preceding steps to the immediately following value if there is one, and constituting the compressed sequence of the compressed values, each corresponding to a respective initial value.

Description

technical field [0001] The invention relates to the field of compressing digital values ​​of digital image, audio and / or video files, in particular files comprising sequences of values. Background technique [0002] The main constraints of the compression method are on the one hand to reduce the octet-sized amount of the original digital file as much as possible by compressing it, and on the other hand to restore a file as close as possible to the original file. [0003] Certain compression methods allow exact restoration of the original value. This is the case for DPCM modulation. According to this method, the original value (ie, the first value of the original digital file) is preserved, and then each other value is replaced by the difference between this value and the preceding value in the original file. The amount corresponding to the difference is generally smaller than the amount corresponding to the initial value, which makes it possible to obtain a compressed file...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M7/30H04N19/90
CPCH03M7/30H04N19/90
Inventor T·M-E·热尔韦
Owner 简·克劳德·科林
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