Signup and Biometric Verification Methods, and Related Systems and Devices

A method for signing up a person for biometric verification purposes is provided, the method including: acquiring an image of a biological attribute of the person, the biological attribute including a set of characteristic elements, defining, within the acquired image, at least one area that includes at least part of the biological attribute, and storing, in a biometric database, at least one piece of information indicating that the number of characteristic elements included in said defined area is less than a respective predetermined integer. A related biometric verification method is also provided.