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How does the size of fingerprint sensor effect reliability?
If the fingerprint sensor has only captured a small part of the overall fingerprint, trying to match this in everyday use will be extremely difficult. People are unlikely to place their finger on a sensor in the same position every single time, so it is important that the sensor is large enough to capture the fingerprint at a variety of ergonomically friendly angles. This pinching action, known as ‘tip touching’ is very natural when handling a payment card and must therefore be accounted for.