Method for obtaining a fingerprint image

Method for obtaining an image of at least one fingerprint from a sequence of images acquired by an image sensor of a fingerprint capture system making acquisitions of images with a predefined image acquisition frequency dependent on said image sensor, wherein method comprises:

• obtaining an image, referred to as the first segmented image, resulting from an application of an image segmentation method to a first acquired image, said segmentation method being suitable for identifying regions corresponding to prints in an image;
• for each acquired image, referred to as the second acquired image, following the first acquired image, applying a processing comprising:
• obtaining an image, referred to as the second segmented image, resulting from an application of the image segmentation method to the second acquired image;
• applying a region-tracking method to the regions identified in each segmented image from the first segmented image to the second segmented image;
• determining a confidence mark for each region identified, the confidence mark of a region of the second segmented image associated with a region of a previous segmented image being a sum between the confidence mark of said region of the previous image and an increment dependent on the predefined image acquisition frequency, and the confidence mark of a region identified in at least one segmented image preceding the second segmented image but not having a corresponding region in the second segmented image is a difference between the confidence mark of said region of the previous segmented image and of a second increment dependent on the predefined image acquisition frequency;
• and
• determining a number of regions, referred to as admissible regions, identified in the segmented images from the first segmented image to the second segmented image having a confidence mark higher than a first predetermined threshold;
• and,
• when the number of admissible regions is equal to a second predetermined threshold, ending the acquisitions of images and generating information making it possible to obtain an image comprising, for each admissible region, a zone of an acquired image corresponding to the admissible region.