Observers based synchronization and input recovery for a class of chaotic systems. Application to image transmission

Estelle Cherrier (1) , Mohamed Boutayeb (2) , José Ragot (3)

1 Monétique & Biométrie
2 LSIIT - Laboratoire des Sciences de l'Image, de l'Informatique et de la Télédétection
3 CRAN - Centre de Recherche en Automatique de Nancy

This paper presents an image transmission as an application of a chaotic cryptosystem. The underlying problem concerns nonlinear state estimation and unknown input recovery. The proposed communication scheme consists of two steps: the first one assures the transmitter/receiver synchronization while the second step focuses on the encryption/decryption procedure. The synchronization is performed through a nonlinear state observer design, driven by the transmitted signal. The encryption is realized through phase modulation of a second chaotic signal, depending on the message. Efficiency of the proposed approach is shown through an image transmission.

Domaines: Automatique / Robotique

Estelle Cherrier, Mohamed Boutayeb, José Ragot. Observers based synchronization and input recovery for a class of chaotic systems. Application to image transmission. Jan 2007, pp.CDROM. ⟨hal-00118560⟩