Abstract: This method of transmission of an animation in a digital image by a first server containing a descriptive file of the animation to a client, an animation being defined by a series of portions of a digital image according to a plurality of requests to be received from the client, comprises the steps of, at reception by the first server of a request from the client on the animation descriptive file, transmission (908) of the descriptive file to the client and to a second server. The second server is enabled to prepare (912) appropriate responses to a series of client requests deduced from the descriptive file and anticipating the plurality of requests to be received from the client.

Abstract: The invention relates to a method of processing digital data constituting a signal in a distributed communication network comprising a plurality of communication apparatuses, the signal being identified by a unique identifier (ID), characterized in that the method comprises the following steps: storing one or more parts of the signal, termed exploitable parts of the signal, at one at least given address of a memory location and in a format readable by an application, associating the unique identifier of the signal with each exploitable part of the signal, storing in at least one communication apparatus a data structure establishing a link between each exploitable part of the signal and the unique identifier of that signal.

Abstract: A method of allocating at least one service by a first peer (E) to a second peer (D), the peers being linked by means of a computer communication network, the first and second peers belonging respectively to a first and second group of peers adapted to share data, comprises the following steps: evaluating (E63) a distance (d0) between the first peer (E) and the second peer (D); and selecting (E65) a service allocated by the first peer (E) according to the value (d0) of the distance.

Abstract: The invention concerns a method of inserting a suppementary information item in a set of data reprenting physical quantities, the data having been processed by the steps of, a) partitioning (E2) the set into subsets, b) entropic coding (E4) of each of the subsets, c) selecting (E8), for each of the subsets, a compression rate and distortion pair according to a global compression rate or a global distortion, d) writing, for each of the subsets, an index (Tij) representing the selected compression rate and distortion pair, in a file containing the coded subsets, characterised in that it also includes a step (E11) of modifying the selected compression rate and distortion pairs, according to the supplementary information (wm).

Abstract: The invention relates to a method of processing a digital signal identified by a unique identifier in a distributed communication network composed of several communication apparatuses, comprising the steps of: storing at least a part of me data constituting the identified digital signal in a local storage located in one of the apparatus; and managing two descriptors related to the identifier within the local storage, including a first descriptor representative of the identified digital signal and a second descriptor which is dependent on the first descriptor and representative of the part of the data stored in the local storage.

Abstract: In a method of controlling a document sharing support apparatus, there is received information representing the fact that a first computer is storing at least a low-resolution version of a document, and the low-resolution version of the document is acquired and stored. There is received a request for obtaining the document from a second computer, and the low-resolution version of the document in memory is made available to the second computer.

Abstract: The invention concerns a method of inserting a message in an image, characterized in that it comprises the steps of: selecting a set of points in the image as a function of predetermined criteria, so as to form a coordinate system in the image, calculating (S21) an affine transformation between a predetermined coordinate system and the coordinate system formed in the image, generating (S24) a pseudo-random sequence for each symbol of the message to be inserted, in the predetermined coordinate system, projecting (E25) each pseudo-random sequence into the coordinate system formed in the image, by affine transformation, inserting (S27) each symbol of the message to be inserted, as a function of its respective projected pseudo-random sequence.

Abstract: The invention proposes a method of inserting a message in a subset (VO) of digital data representing physical quantities, characterized in that it includes the steps of: estimating (E4) a capacity to receive a message for said subset, selecting (E5) a message with a size less than or equal to the estimated capacity, in a set of a messages, inserting (E6) the selected message in the said subset of digital data. The invention applies particularly to an object in a digital image.

Abstract: This method of transmission of an animation in a digital image by a first server containing a descriptive file of the animation to a client, an animation being defined by a series of portions of a digital image according to a plurality of requests to be received from the client, comprises the steps of, at reception by the first server of a request from the client on the animation descriptive file, transmission (908) of the descriptive file to the client and to a second server. The second server is enabled to prepare (912) appropriate responses to a series of client requests deduced from the descriptive file and anticipating the plurality of requests to be received from the client.

Abstract: A method for the prior monitoring of the detectability of a watermarking signal inserted by modulation in a set of coefficients representing for example a digital image. The method comprises the step of simulating a distortion on the set of modulated coefficients, the distortion corresponding to a given compression level of the set of coefficients before modulation, determined by optimisation of a ratio of transmission rate to distortion. The method further comprises the step of calculating a detectability test on the set of modulated coefficients after distortion, and a step of comparing the detectability test with a threshold detection value. The method is used notably for inserting a watermarking signal during the compression of a digital image.

Abstract: A method of determining a partition into distinct regions of a set of coefficients representative of at least a part of an image in order to insert a watermark comprises the following steps: generation (E501) of a centred pseudo-random sequence (w) equal in size to the cardinal number (N) of the said set of coefficients, formed from centred pseudo-random sub-sequences; modulation (E502) of the said set of coefficients by the said centred pseudo-random sequence (w) in order to insert the same information bit on the said set of coefficients; and checking (E504–E508), over each region, of a criterion of detectability of the information bit inserted by modulation. Use especially for determining an adaptative partition as a function of a criterion of detectability of an information bit inserted on each region.

Abstract: In order to decode a received digital signal which has been watermarked with a known watermark, at least part of the digital signal is decoded by using a parametrisable iterative decoder, the watermark is extracted from the decoded signal, the extracted watermark is compared with the known watermark, and at least one parameter of the decoder is modified if necessary, according to the result of the comparison.

Abstract: The invention concerns a method of processing a set of coefficients representing a digital image (300) with a view to an insertion of at least one item of watermarking information in said image, this image being liable to undergo a set of geometric transformations and said coefficients being grouped together in regions, said method being characterized in that it includes a step (E220) of determining, amongst at least some of said regions, a set of so-called acceptable regions, adapted to receive said at least one item of watermarking information; and a step (E230) of sequencing, according to at least one predetermined criterion, at least one part of said set of acceptable regions, in an order which is invariant with respect to at least one of said geometric transformations.

Abstract: A method of inserting a watermark in digital data (I) includes the steps of multi-resolution spectral breakdown (E1) of the digital data (I); extraction (E2) of the components of lowest frequency; choice (E3) of a subset of the components with the lowest frequency; modulation (E4) of the components of said subset in order to insert the supplementary information (S); and reverse multi-resolution spectral recomposition (E5) of the watermarked digital data (I?).

Abstract: The invention relates to a method of processing digital data constituting a signal in a distributed communication network comprising a plurality of communication apparatuses, the signal being identified by a unique identifier (ID), characterized in that the method comprises the following steps: storing one or more parts of the signal, termed exploitable parts of the signal, at one at least given address of a memory location and in a format readable by an application, associating the unique identifier of the signal with each exploitable part of the signal, storing in at least one communication apparatus a data structure establishing a link between each exploitable part of the signal and the unique identifier of that signal.

Abstract: A method of transcoding digital data coded according to a first coding mode into digital data coded according to a second coding mode. The method includes detecting the inactivity of resources useful for the transcoding, and transcoding the digital data coded according to the first coding mode into the digital data coded according to the second coding mode, when the inactivity is detected.

Abstract: A method of allocating at least one service by a first peer (E) to a second peer (D), the peers being linked by means of a computer communication network, the first and second peers belonging respectively to a first and second group of peers adapted to share data, comprises the following steps:

Abstract: The invention concerns a method of inserting a message in an image, characterized in that it comprises the steps of:

Abstract: A method of inserting a watermarking signal (w) in a set (X) of coefficients (Xi) representing a digital image (I), in which at least one subset of coefficients is modified by said watermarking signal (w), comprises, for each representative coefficient (Xi) to be modified, a step of determining a neighborhood (V(Xi)) of the representative coefficient (Xi) to be modified, in the image (I); a step of selecting a neighborhood (Vsimd) in a dictionary of neighborhoods representing coefficients representing the image (I), according to a predetermined criterion of similarity with the neighborhood (V(Xi)) of the representative coefficient (Xi) under consideration; and a step of modifying the representative coefficient (Xi) as a function of the watermarking signal (w) and a predetermined masking data item (M(Vsimd)) representing the masking effect on a watermarking signal, of the neighborhood (Vsimd) selected in the dictionary.

Abstract: The invention relates to a method of processing a digital signal identified by a unique identifier in a distributed communication network composed of several communication apparatuses, comprising the steps of: