Abstract: The invention concerns a method of dividing a digital signal representing physical quantities, characterised in that it includes the steps of:

Abstract: In order to code a digital signal, a simplified version of the digital signal is determined, containing only some of the information contained in the digital signal. The simplified version is coded by means of a predetermined single coding technique. This simplified version is subtracted from the digital signal, so as to obtain a residual signal. From each block of the simplified version, there is selected, for each corresponding block of the residual signal, a coding technique amongst a predetermined number M of coding techniques Ci, where i is an integer between 1 and M. Each block of the residual signal is coded by means of the previously selected coding technique.

Abstract: The invention relates to a method of encoding digital samples of a set of data representing physical quantities, the encoding including the determination (S51) of a path among the samples of the set, characterized in that it comprises the steps of:

Abstract: The invention concerns a method of coding a set of coefficients representing physical quantities,

Abstract: The invention relates to a method of processing a digital signal comprising samples (a1, a2, . . .

Abstract: The invention concerns a method of converting, into bit-map mode, digital data representing physical quantities, in order to transmit the converted data from a first data processing device to a second data processing device, including the steps of: forming bands of data to be converted, the bands having a predetermined height (HB), forming blocks in each band previously formed, characterised in that the blocks have a block width (LBL) which is determined (E2) as a function of the memory available in the second device, the blocks have a block height (HBL) which is determined (E3) as a function of the memory available in the first device.

Abstract: The invention proposes a digital signal coding method including a step (E1) of analysing the digital signal (IM) into a plurality of frequency sub-bands, at least one first sub-band having a lower frequency and at least one second sub-band having a higher frequency, characterised in that it includes, for each second sub-band, the steps of: dividing (E4) the second sub-bands into blocks (Bp,n), selecting (E9) first blocks which are to be coded by setting to a predetermined value and second blocks which are to be coded by trellis coded quantization, according to a selection criterion, linking (E16) the second blocks selected at the previous step in order to form a series of blocks, coding (E17) the series of blocks by trellis coded quantization of a series of coefficients extracted from the second blocks of the second sub-band.

Abstract: According to the invention, the method of primary processing of a first set of primary data (IM,f) representing physical quantities includes: a set division step (200A to 202) during which the first set of data is divided into sub-sets of first data, and for each first sub-set of data: a step (205 to 207) of “constructing” a global contractive mapping of the first type, for the said first sub-set of data, whose fixed point constitutes an approximation of all or part of this sub-set. The set of parameters (ai, b) thus determined constitutes a primary representation of the said first set of data.

Abstract: The method of the invention determines conditions for a processing able to be carried out on data of a document, by at least one input/output means. It includes: an operation of determining at least one symbol scatter quantity related to the said document, an operation of comparing each said scatter quantity with predetermined values, and a configuration determination operation during which the result of each said comparison is taken into account in order to determine the configuration of the input/output means intended to implement this processing.

Abstract: According to the invention, the method of primary processing of a first set of primary data (IM,f) representing physical quantities includes:

Abstract: The invention concerns a method of adjusting at least one parameter for the compression of data representing physical quantities, the compressed data then being coded according to a coding mode in order to protect them against transmission errors, characterised in that it includes, as from a required compressed data size (RT), the steps of:

Abstract: A method of adapting the content of documents on an information server includes the following steps:

Abstract: The invention relates to a method for alerting during the progressive decoding of a digital image coded with a region of interest, characterised in that it includes the stages of:

Abstract: In order to code a digital signal, it is decomposed (20) into several subsignals; each subsignal is coded (38) by means of a coding technique taken from amongst M coding techniques Ci; and the stream of coded bits thus produced is entered (40) in a first part of a file intended to receive the coded digital signal. Then the application, successively to each coded subsignal, of each decoding technique Di associated with the coding technique Ci is simulated (48); and if and only if at least two different decoding techniques are acceptable, within the meaning of a predetermined likelihood criterion, for decoding the same coded subsignal, there is entered (52) in a second part of the file information making it possible to select, during decoding, the decoding technique associated with the coding technique used for coding this subsignal.

Abstract: The invention concerns a device for limiting the bending radius of a flexible duct comprising at least a bend stiffener arranged around one length of the flexible duct and fixed by a rear part on a fixed end support, characterized in that it further comprises an element for maintaining the bend stiffener arranged between the flexible duct and the bend stiffener and comprising at least a portion capable of flexural bending extending over one length of the flexible duct located at least between the rear part and the end of the bend stiffener.

Abstract: The invention proposes a digital signal coding method including a step of analysing (E1) the digital signal (IM) into a plurality of frequency sub-band signals distributed according to at least two different frequency bands, at least one first sub-band signal having a lower frequency and at least one second sub-band signal having a higher frequency, characterised in that it includes, for each second sub-band signal, the steps of: dividing (E4) the second sub-band signals into blocks (Bi,n), selecting (E9) blocks to be coded by setting to a predetermined value, according to a selection criterion, coding the blocks selected by setting to the predetermined value.

Abstract: A method and apparatus for decoding a quantized digital signal. Quantization symbols are read and an experimental distribution of the quantization symbols is constructed. An experimental distribution is approximated by means of a continuous distribution model which passes through values of the experimental distribution. A dequantization vector, for at least one quantization cell, equal to the center of mass of the points of the quantization cell weighted by the values of the restricted continuous distribution is calculated. The dequantization vectors associated respectively with the quantization symbols are then stored for use in decoding.

Abstract: In order to code a digital signal (IM), the invention combines a breakdown of the digital signal into frequency subbands and a finite state vectorial quantization of the subbands. The digital signal is analysed in a plurality of frequency subbands distributed in accordance with at least two different resolutions, and then the subbands of higher resolution are coded by finite state vectorial quantization as a function of the subbands of lower resolution.

Abstract: In order to progressively transmit a digital image (IM), a method for coding the image comprises the division (E1) of the image into vectors (V.sub.m,n), the selection (E2) of a code vector (VC.sub.d) associated with an index (A.sub.d) for each of the image vectors, and the replacement (E2) of the image vectors by the indices associated with the selected code vectors, in order to produce a plane of indices (PI) representing the image. The method comprises the steps of sub-sampling (E3) the plane of indices (PI) into sub-planes of indices (SPI.sub.1 to SPI.sub.F) respectively comprising indices selected from the plane of indices, and ordering (E4) the sub-planes of indices according to a predetermined order before transmitting them.

Abstract: A method for a multidimensional search for a close neighbor of an input vector, amongst a first set of reference vectors, comprises the prior determination of a first set of hyperplanes in the space containing the reference vectors, then selection of a first hyperplane from the first set, formation of a second set of reference vectors, by eliminating reference vectors which are on the other side of the first hyperplane selected, compared with the input vector, formation of a second set of hyperplanes, by eliminating the said first hyperplane, reiteration, a predetermined number of times, of the selection and formation operations, taking, as the first set of reference vectors and as the first set of hyperplanes, respectively, the second sets formed previously, and searching for the closest neighbor of the input vector in the second set of reference vectors.