Patent ID: 7957244

Claim:
A method of reading digital information registered in layers of an optical information storage medium that can be read in super-resolution on the basis of an optoelectronic system comprising a reading laser beam, the power density at the center of the reading laser beam is sufficient to produce a local modification of the optical properties of at least one of the layers over a smaller zone than the resolution of the optoelectronic system, the method comprising the steps of: modeling of the response provided by varied binary sequences on the basis of the modeling of the partial response provided by an isolated information bit, and the searching for the maximum resemblance between a sequence of samples arising from the reading of the information and the responses of the varied sequences modeled, wherein the model corresponding to an isolated bit, on the basis of which the models for the varied binary sequences are established, includes the superposition of a first simple model representing a Gaussian representative of the spatial energy distribution of a reading laser beam and of a second simple model representative of a narrower Gaussian than the first and representative of an additional optical action limited to the central part of the laser beam.