The invention provides a method for detecting fraud (220) during biometric authentication of an individual comprising the acquisition (210), by an optical device, of a sequence of candidate images comprising at least two candidate images of an individual, with view to comparing said sequence with a reference image sequence comprising at least one reference image of an individual acquired during a preliminary enrollment step (100) by the same optical device, the method comprising the steps of: estimating (221), from the sequence of candidate images, the geometrical parameters of the optical device having acquired said sequence of candidate images on the individual, and comparing (222) said geometrical parameters with the geometrical parameters of the optical device having acquired the reference image sequence, and from the result of the comparison, determining (223, 224) whether the verification image sequence was acquired from at least one pre-recorded image of the individual.