Thales

Didier Nicholson

Catherine Lamy

Cyril Bergeron

Cédric Le Barz

Marc Leny

Séverine Baudry

Philippe N'guyen

Christophe Papin

Catherine Simon

A dynamically reconfigurable video surveillance system includes at least one video camera, a remote server, at least one viewing terminal, means making it possible to record the video sequences captured by the camera or cameras, said system being characterized in that: the video camera or cameras and the remote server include means for communicating with one another across a telecommunications network; the video camera or cameras include means for compressing the video sequences captured, the compression rate being adapted dynamically by taking account of the control messages originating from the remote server; the video camera or cameras include means for analyzing said video sequences in the compressed domain, to characterize the activity detected in their field of vision and to forward the result of this characterization to the remote server; the remote server include means for computing for each of the compressed video streams originating from the video camera or cameras a command making it possible to parametrize each of them by taking account of the signaling data received.

Dynamically reconfigurable intelligent video surveillance system

A method for estimating a bit rate and the distortion of at least one compressed image using at least one wavelet transform operation delivering at least one sub-band b containing coefficients, said sub-band being subdivided into at least one packet of coefficients associated with a compression quality layer, said packet also including a packet header and being transmitted through a propagation channel, said method including estimating a distortion Dlinked to a compression of the coefficients of said packet, estimating a distortion D'linked to a corruption or loss of said packet, estimating a compression bit rate L, estimating a sensitivity {tilde over (D)}of said packet according to Dand D&#x2032;and the bit rate L, and estimating a distortion of said image linked to a decompression of said packet based on {tilde over (D)}.

Method for estimating the throughput and the distortion of encoded image data after encoding

In a method to protect and/or detect information in a data transmission system, the pieces of data exchanged have a format comprising one or more headers and a data zone. The method comprises at least one step for the insertion, into at least one header, of at least one EPB marker segment comprising redundancy data to detect and/or correct errors.

Method and system for the protection of data with a header in a transmission system

A process for watermarking images that includes embedding into the images before their transmission a message by modifying the data characteristic of the images. Further, a co-watermarking is performed by periodic embedding of a binary matrix into the image to determine on reception the co-ordinates of the origin of the initial image and allow the registration of the images received relative to this origin so as to make it possible to read the embedded message. Such a process may find particular application to the transmission of stationary or video images.

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Asnieres S/Seine, France

Didier Nicholson