Image coding by use of discrete cosine transforms

Details Image coding by use of discrete cosine transforms Image coding by use of discrete cosine transforms

G - Physics

06

F

G06F 17/14 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01)

Patent

CA 2173746

Image coding methods and apparatus employing discrete cosine transforms for suppressing and/or reducing blocking artifacts using a JPEG file format. The methods can be implemented on JPEG hardware slightly modified to provide access to discrete cosine transform coefficients Filtering techniques by which an overlap procedure for implementing the inventive methods are also disclosed.

Procédé et appareil de codage d'images au moyen de transformations en cosinus discrètes afin de supprimer et/ou de réduire les effets de blocage par l'utilisation d'un format de fichier JPEG (Groupe d'Experts en Photographie). Ces procédés peuvent être mis en application sur un matériel JPEG légèrement modifié afin de permettre d'accéder aux coefficients de transformation en cosinus discrète. Des techniques de filtrage permettant d'utiliser un processus de recouvrement pour appliquer les procédés suivant l'invention sont également décrites.

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