Computer-implemented method for obtaining a combined image

A device comprising at least one processor and a memory comprising computer-executable instructions that, when executed by the at least one processor, cause the device to perform operations comprising:

• obtaining a first image and a second image of a biometric feature of a user, the biometric feature comprising a plurality of characteristics;
• identifying, in the first image and in the second image, the plurality of characteristics;
• storing the first and second image and the identified plurality of the characteristics;
• identifying, for at least some of the identified plurality of the characteristics in the first image, a corresponding identified plurality of the characteristics in the second image;
• deriving a transformation for transforming the at least some of the identified plurality of the characteristics in the second image into the corresponding identified plurality of the characteristics in the first image, wherein deriving the transformation comprises using a neural network to determine at least one value characterizing the transformation;
• modifying at least a portion of the second image using the transformation;
• and
• obtaining a combined image comprising at least one portion of the first image and the at least one modified portion of the second image.