Device for the biometric acquisition and processing of an image of a part of the human body presenting dermatoglyphs, comprising: - a contact surface configured so that the part of the human body is affixed to this contact surface , - a light source configured to illuminate the contact surface , - an imager configured to acquire an image of the part of the human body affixed to the contact surface , - an automated data processing system configured to receive the image acquired by the imager, characterized in that the light source is configured to project on the part of the human body affixed to the contact surface a light pattern having a sinusoidal modulation of light intensity according to a main direction with a target frequency, and in that the automated data processing system is configured to perform the following steps: a) analysis of the acquired image (S3) to identify in it at least one value of a periodic component parameter and one value of a continuous component parameter of a variation in light intensity in accordance with the main direction, wherein the value of the periodic component parameter is representative of an amplitude of a sinusoidal oscillation of light intensity in the acquired image in accordance with the main direction at the target frequency, wherein the value of the continuous component parameter is representative of an average of the light intensities in the acquired image; b) implementation on the basis of the value of the continuous component parameter and the value of the periodic component parameter of a fraud detection method (S4) to authenticate that the part of the human body is an authentic feature of a human body; c) compensation (S5) of the sinusoidal oscillation of the light intensity in the acquired image by multiplying the intensity of the acquired image by a correction function comprising a correction parameter representative of an amplitude of a sinusoidal oscillation of the light intensity in the acquired image in accordance with the main direction at the target frequency, in order to obtain a compensated image; d) implementation (S6) of a biometric identity recognition method based on the compensated image. - a contact surface configured so that the part of the human body is affixed to this contact surface , - a light source configured to illuminate the contact surface , - an imager configured to acquire an image of the part of the human body affixed to the contact surface , - an automated data processing system configured to receive the image acquired by the imager, a) analysis of the acquired image (S3) to identify in it at least one value of a periodic component parameter and one value of a continuous component parameter of a variation in light intensity in accordance with the main direction, wherein the value of the periodic component parameter is representative of an amplitude of a sinusoidal oscillation of light intensity in the acquired image in accordance with the main direction at the target frequency, wherein the value of the continuous component parameter is representative of an average of the light intensities in the acquired image; b) implementation on the basis of the value of the continuous component parameter and the value of the periodic component parameter of a fraud detection method (S4) to authenticate that the part of the human body is an authentic feature of a human body; c) compensation (S5) of the sinusoidal oscillation of the light intensity in the acquired image by multiplying the intensity of the acquired image by a correction function comprising a correction parameter representative of an amplitude of a sinusoidal oscillation of the light intensity in the acquired image in accordance with the main direction at the target frequency, in order to obtain a compensated image; d) implementation (S6) of a biometric identity recognition method based on the compensated image. <EOS>