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 processor, cause the device to perform operations comprising:

• obtaining a first original image and a second original image of a biometric feature of a user, the biometric feature comprising a plurality of characteristics;
• determining a frequency of at least some of the plurality of characteristics in the first original image and in the second original image;
• resizing, based on the determined frequency, at least one of the first original image or the second original image to obtain a first image and a second image;
• identifying, in the first image and in the second image, a subset of the plurality of characteristics;
• storing the first and second image and the identified characteristics;
• for at least some of the identified characteristics in the first image, identifying corresponding identified characteristics in the second image;
• deriving an affine transformation for transforming the at least some of the identified characteristics in the second image into the corresponding identified characteristics in the first image;
• modifying at least a portion of the second image using the affine transformation;
• and
• obtaining a combined image comprising at least one portion of the first image and at least the modified portion of the second image.