Method for generating variable guilloche patterns, implementing device and identification document comprising such patterns

A device for generating guilloche patterns consisting of a plurality of one-dimensional guilloche patterns comprising:

• a computer programmed with a set of instructions that direct said computer to carry out a method for generating guilloche patterns, each one-dimensional guilloche pattern assumes a variable wavy line form, the set of instructions including instructions to:
• format alphanumeric data to be encoded in a predefined number of formatted data blocks each having a plurality of datum and being of a predefined size;
• generate, per block, at least one carrier function comprising a plurality of parameters, including at least one parameter selected from the formatted data blocks;
• and
• modulate the carrier function by the formatted data blocks so as to encode the alphanumeric data graphically, each data block defining a guilloche pattern, the number of data blocks defining the number of guilloche patterns, and
• the carrier function associated with a formatted data block is modulated locally, each datum of the block being encoded locally in the guilloche pattern, by interpolation of a predefined point associated with the carrier function.

An identification document comprising an identification photograph and alphanumeric data relative to a holder of the identification document, wherein the identification photograph visibly comprises guilloche patterns consisting of a plurality of one-dimensional guilloche patterns encoding formatted data, collected from alphanumeric data relative to the holder, each guilloche pattern being able, itself, to encode alphanumeric data ensuring a variable aspect to each guilloche pattern, said guilloche patterns generated by:

• formatting alphanumeric data to be encoded in a predefined number of formatted data blocks each having a plurality of datum and being of a predefined size;
• generating, per block, at least one carrier function comprising a plurality of parameters, including at least one parameter selected from the formatted data blocks;
• and
• modulating the carrier function by the formatted data blocks so as to encode the alphanumeric data graphically, each data block defining a guilloche pattern, the number of data blocks defining the number of guilloche patterns, and
• the carrier function associated with a formatted data block is modulated locally, each datum of the block being encoded locally in the guilloche pattern, by interpolation of a predefined point associated with the carrier function.