1. A method for estimating on a curve a relevant point for detecting an anomaly of an engine, said curve representing a time-dependent change in physical operation parameters of the engine measured by at least one sensor on said engine, applied by a computer connected to first storage means, said first storage means storing in memory at least one profile comprising a directional binary code, each component of which codes a direction of variation between two consecutive characteristic points of at least one learning curve, a model allowing estimation of a relevant point from a set of characteristic points of a curve, and a filter, said method comprising: a/ selecting a profile stored in memory in the first storage means; b/ applying the filter of the selected profile to said curve; c/ determining a set of characteristic points of said filtered curve and of the directional binary code, each component of which codes the direction of variation of two consecutive characteristic points belonging to said set of characteristic points; d/ comparing the determined directional binary code and the code of the selected profile; e/ depending on said comparison, estimating the relevant point on said curve from the characteristic points of said filtered curve and from the model of the selected profile.