Method and apparatus for selective data encryption

Details Method and apparatus for selective data encryption Method and apparatus for selective data encryption

H - Electricity

04

N

H04N 21/2347 (2011.01)

Patent

CA 2711716

A layered audiovisual packet data stream (CNT'), such as one obtained by a JPEG2000 encoder (810), is received together with information (metadata) about the contribution of each packet to the reduction of image distortion. The distortion-to-rate ratio for each packet is calculated (710) and the packets are ordered (720) is descending ratio. The non-encrypted packet having the highest ratio is encrypted (730) until the target distortion is obtained. Also provided is an apparatus (800). In a variant, the data in the packets are substituted by dummy data instead of encrypted.

Selon l'invention, un flux de données par paquets audiovisuel en couche (CNT'), tel que celui obtenu par un codeur JPEG2000 (810), est reçu conjointement avec des informations (métadonnées) concernant la contribution de chaque paquet à la réduction de distorsion d'image. Le rapport distorsion sur taux pour chaque paquet est calculé (710) et les paquets sont ordonnés (720) par rapport décroissant. Le paquet non crypté ayant le rapport le plus élevé est crypté (730) jusqu'à ce que la distorsion cible soit obtenue. L'invention porte également sur un appareil (800). En variante, les données dans les paquets sont remplacées par des données factices au lieu d'être cryptées.

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