Abstract: A method for compressing and decompressing sequences of floating-point numbers includes determining a minimum value and a maximum value of the floating point numbers of the sequence, determining a quantization step value as a function of the minimum and maximum values, compressing each floating point number of the sequence by applying to the floating point number a linear quantization between the minimum and maximum values and using the quantization step value, and inserting each compressed value resulting from the compression step in a binary sequence.

Abstract: A method for encoding a group of several structured fragments includes analyzing structure schemas of the fragments in order to obtain sequences of executable instructions for each component of the schemas. The instruction sequences are executed on the structured fragments so as to obtain an encoded binary stream containing the control codes and the information elements values of the fragments. The values of the information elements of the fragments in data blocks are distributed as a function of the respective types of the elements. The respective positions in the structure block are stored in a pointer table for each fragment and in the data blocks of the control codes and the information element values of the fragment. Compression algorithms are applied to the blocks adapted to the contents thereof, and the contents of the pointer table and data blocks are concatenated into an encoded binary container.

Abstract: The invention regards a method for compressing a hierarchical tree describing a multimedia signal, said tree comprising nodes and leaves, which can be associated to contents of at least two distinct types. According to the invention, said method implements a content compression for at least some of said leaves by means of at least two compression encoding techniques, each of said techniques being selectively associated to at least one of said content types.

Abstract: An encoding method for enabling a decoder to decode a structured document having a structure defined in a first schema not accessible to the decoder and resulting from a change of a second schema accessible to the decoder, the first schema defining at least one information element which is derived from a corresponding element defined in the second schema, the encoding method comprising the steps of: encoding the document using said first and second schemas into a binary stream comprising for each elements of the document a binary sequence encoding the element, and inserting in the binary sequence encoding the derived element a reference designating the first schema in which the structure of the derived element is defined, said reference designating the first schema being defined in a schema reference list containing references to all schemas used for encoding the document, the schema reference list being made accessible to the decoder.

Abstract: The invention relates to a method for encoding and decoding a path that is applied to the hierarchical structure of a structured document, in which a path is defined by a series of segments that connect an originating node to a destination node. Each node represents a document information element which is associated with at least one type of information. The inventive method comprises: a preliminary stage whereby each node in the structure is assigned a list of pairs comprising a name and a type of information element, represented by all the nodes likely to be directly attached to the node, and whereby a respective binary code is allocated to each name/type pair, and a path encoding stage whereby the binary node code that represents the name/type pair of the destination node of the segment is determined (21, 22) for each segment of the path to be encoded, and (23) said code is subsequently inserted in the path code.

Abstract: An encoding method for enabling a decoder to decode a structured document having a structure defined in a first schema not accessible to the decoder and resulting from a change of a second schema accessible to the decoder, the first schema defining at least one information element which is derived from a corresponding element defined in the second schema, the encoding method comprising the steps of: encoding the document using said first and second schemas into a binary stream comprising for each elements of the document a binary sequence encoding the element, and inserting in the binary sequence encoding the derived element a reference designating the first schema in which the structure of the derived element is defined, said reference designating the first schema being defined in a schema reference list containing references to all schemas used for encoding the document, the schema reference list being made accessible to the decoder.

Abstract: The invention concerns a method for compressing a structured document comprising nested information elements, the document being associated with at least a tree-like structure schema (1) defining a structure of the document and comprising of nested structural components, representing information elements, which consists in: analysing (11) and compiling (13) the structural schema of the document to obtain for each component of the schema, a sequence or executable instructions (5), comprising instructions for inserting control codes and codes of element or calling for sequences of component instructions, and instructions for controlling the development of the execution of the sequence on the basis of control code values; and decompressing (14′) the document to be decompressed (10) which is in the form of a bit stream, said step including execution of sequences of instructions (5) on the bit stream, to restore a document with original format.

Abstract: The method applies to a structured document (D) presenting a hierarchical structure defined by a structure schema, the document combining a main structured set (1) of information including information subsets (1.1, 1.2, 1.3, . . . , 1.2.2.2), at least some of the information subsets being structured and being capable of including information subsets of lower hierarchical level, each information subset being associated in the higher level information set with a respective information type (T). The method comprises the steps of: dividing the document into structured portions (P1, P2, P3) capable of being handled individually, namely a main portion (P1) and at least one secondary portion (P2, P3), the main portion containing at least the main set (1) of information, and the secondary portion containing an information subset (1.2.1, 1.2.

Abstract: The invention concerns a method for compressing and decompressing a structured document, associated with at least a tree diagram structure defining a document structure and comprising nested structure elements, associated with a type of information, and representing sets of data, the method comprising steps which consists in: performing a syntactic analysis of the structure diagram and standardizing it so as to obtain a single predefined sequence of the elements of the diagram; compiling the standardized diagram to obtain finite automata, each automaton comprising states interconnected by transitions respectively representing the elements of the structure; and compressing the document, and executing at least a compression algorithm associated with a type of information, when a set of data having the type of information is encountered in the document.