TERMIUM Plus®
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FACTEUR COMPRESSION [1 record]
Record 1 - internal organization data 2017-04-28
Record 1, English
Record 1, Subject field(s)
- Computer Mathematics
- Codes (Software)
Record 1, Main entry term, English
- compression ratio
1, record 1, English, compression%20ratio
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
Relationship of the total bits used to represent the original to the total number of encoded bits. 2, record 1, English, - compression%20ratio
Record number: 1, Textual support number: 2 DEF
The factor by which digital data, such as images and sounds, can be compressed. 3, record 1, English, - compression%20ratio
Record 1, French
Record 1, Domaine(s)
- Mathématiques informatiques
- Codes (Logiciels)
Record 1, Main entry term, French
- facteur de compression
1, record 1, French, facteur%20de%20compression
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- taux de compression 1, record 1, French, taux%20de%20compression
correct, masculine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
[...] la norme de référence JPEG décompose tout d'abord l'image en petits blocs de 8x8 pixels et définit, pour chacun de ces blocs, la fréquence d'apparition d'un même pixel grâce à une transformée en cosinus directe (DCT pour les anglo-saxons) dérivée de la transformation de Fourier. [...] Une deuxième étape quantifie les coefficients de Fourier et opère une dégradation de l'image selon un algorithme propriétaire (non diffusé). Cette dégradation dépend du facteur de compression retenu par l'utilisateur. On admet que, pour un taux de compression compris entre 10 et 20, l'œil ne perçoit pratiquement aucun changement. Au-delà, les différences sont beaucoup plus apparentes. 1, record 1, French, - facteur%20de%20compression
Record 1, Spanish
Record 1, Textual support, Spanish
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© Public Services and Procurement Canada, 2026
TERMIUM Plus®, the Government of Canada's terminology and linguistic data bank
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